EP2204286A1 - Device for inkjet printing of a varnish composition for a printed substrate - Google Patents

Device for inkjet printing of a varnish composition for a printed substrate Download PDF

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Publication number
EP2204286A1
EP2204286A1 EP09290969A EP09290969A EP2204286A1 EP 2204286 A1 EP2204286 A1 EP 2204286A1 EP 09290969 A EP09290969 A EP 09290969A EP 09290969 A EP09290969 A EP 09290969A EP 2204286 A1 EP2204286 A1 EP 2204286A1
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EP
European Patent Office
Prior art keywords
varnish
substrate
printing device
applying
jet printing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP09290969A
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German (de)
French (fr)
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EP2204286B1 (en
Inventor
Edmond Abergel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
MGI Digital Technology SA
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MGI France SA
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Application filed by MGI France SA filed Critical MGI France SA
Priority to SI200931301T priority Critical patent/SI2204286T1/en
Priority to EP15172414.3A priority patent/EP2982512A3/en
Priority to PL09290969T priority patent/PL2204286T3/en
Publication of EP2204286A1 publication Critical patent/EP2204286A1/en
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Publication of EP2204286B1 publication Critical patent/EP2204286B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
    • B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
    • B41J2/04571—Control methods or devices therefor, e.g. driver circuits, control circuits detecting viscosity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
    • B41J29/38—Drives, motors, controls or automatic cut-off devices for the entire printing mechanism
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
    • B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
    • B41J2/04581—Control methods or devices therefor, e.g. driver circuits, control circuits controlling heads based on piezoelectric elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
    • B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
    • B41J2/04588—Control methods or devices therefor, e.g. driver circuits, control circuits using a specific waveform
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
    • B41J29/38—Drives, motors, controls or automatic cut-off devices for the entire printing mechanism
    • B41J29/393—Devices for controlling or analysing the entire machine ; Controlling or analysing mechanical parameters involving printing of test patterns
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M7/00—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock
    • B41M7/02—Dusting, e.g. with an anti-offset powder for obtaining raised printing such as by thermogravure ; Varnishing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/17—Ink jet characterised by ink handling
    • B41J2/175—Ink supply systems ; Circuit parts therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/17—Ink jet characterised by ink handling
    • B41J2/175—Ink supply systems ; Circuit parts therefor
    • B41J2/17503—Ink cartridges
    • B41J2/17513—Inner structure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/17—Ink jet characterised by ink handling
    • B41J2/195—Ink jet characterised by ink handling for monitoring ink quality
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M7/00—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock
    • B41M7/0072—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock using mechanical wave energy, e.g. ultrasonics; using magnetic or electric fields, e.g. electric discharge, plasma

Definitions

  • the present invention relates to the field of inkjet printing machines without physical contact with a substrate intended to be coated with a varnish, and more particularly to the field of printing devices by a piezoelectric technique adapted to function of the printing varnish used.
  • an ink is deposited on the surface of a substrate, which substrate may be, for example, paper or plastic. It is then common to cover the printed surface of this substrate with a protective layer.
  • This protective layer completes the fixation of the printed image on the substrate while guaranteeing the resistance of the printing against certain external aggressions such as projections, even light, heat or moisture or allows to create effects different visuals by printing varnish patterns in certain areas.
  • the deposition of this protective layer on the printed substrate is generally carried out using an Offset Flexographic Printing, Silkscreen printing.
  • the varnish can also customize the document by showing areas with varnish patterns and other areas without varnish.
  • the patent application EP174960 Refers to a digital ink jet machine for laying a coating with medium viscosity on a variable coating substrate by means of nozzles formed by hollow needles vibrated by a piezoelectric actuator glued to a formed resonator by mounting the hollow needle.
  • the size and shape of the drop of material which is then deposited on the surface of the substrate is a function of the duration and the power of the excitation of the actuator.
  • such a device if it allows the deposition of varnish drops with medium or high viscosities which are of the order of a thousand centipoise, is not suitable to ensure optimum ejection of a varnish with a much lower viscosity.
  • the ink-jet printing device for applying a varnish is characterized in that the duration of the plate of the refilling of the varnish nozzle is equal to that of the plate corresponding to the ejection phase of the varnish.
  • the inkjet printing device for applying a varnish is characterized in that the rising edge comprises at least one plate positioned at an intermediate value between the value of the voltaic signal. of rest and the value of the signal at the level of the ejection plate, this plate with an intermediate value corresponding to the preparation of the ejection.
  • the ink jet printing device for applying a varnish is characterized in that the rising edge has an increasing and continuous progression.
  • the ink jet printing device for applying a varnish is characterized in that the value and / or the duration of at least one tray and / or the form of the voltaic wave is predefined and correlated with at least one type of varnish identified in at least one storage means connected to the device for controlling and regulating the shape of the voltaic wave of expulsion of the drop of varnish from the nozzle, allowing the selection of information corresponding to the type of varnish.
  • the ink jet printing device for applying a varnish is characterized in that at least one nozzle of the device incorporates a heating resistor connected to a control device. the viscosity of the drop of varnish in the nozzle, the control device incorporating a means for controlling and regulating the temperature of the drop of varnish in the nozzle.
  • the ink jet printing device for applying a varnish is characterized in that the device for controlling the viscosity of the drop is connected to a memory means integrating with the less a database correlating at least a predetermined temperature of the resistance to a viscosity of the varnish of a given type used at the nozzle outlet according to the composition of the varnish to be deposited.
  • the ink-jet printing device for applying a varnish is characterized in that the nozzle comprises a probe for measuring the viscosity of the varnish upstream of the coating. piezoelectric actuator and / or heating resistor.
  • the ink jet printing device for applying a varnish is characterized in that the ink jet printing device is associated with a programming means. the device for controlling and regulating the shape of the voltaic wave of expulsion of the drop and / or the device for controlling the viscosity of the drop of varnish in the nozzle.
  • the inkjet printing device for applying a varnish is characterized in that the printing device comprises at least one UV lamp downstream from the deposit of the varnish which presents an emission in a length waveform adapted to activate at least one photoinitiator of the composition of the specific varnish of the support of the printed substrate.
  • the ink jet printing device for applying a varnish is characterized in that the printing device comprises at least one infrared lamp positioned in front of the substrate. and arranged upstream of the UV lamp to pre-dry and stretch the varnish deposited on the substrate, the positioning being defined at an optimum distance depending on the substrate on which the varnish is deposited and / or the composition of the varnish deposited.
  • the ink jet printing device for applying a varnish is characterized in that at least one wavelength of the infrared lamp is adapted to provide a pre-painted area. drying and an optimal varnish tension according to the substrate on which the varnish is deposited and / or the composition of the varnish deposited.
  • the ink jet printing device for applying a varnish is characterized in that the printing device comprising at least two infrared lamps emitting in length intervals of wave, the respective power of each of the lamps is controlled and controlled by a device managing a combination of the radiation of the infrared lamps adapted to obtain a pre-drying depending on the substrate on which the varnish is deposited and / or the composition of the varnish deposited.
  • the ink jet printing device for applying a varnish is characterized in that the device comprises means for moving the substrate opposite and at a determined distance from less an infrared lamp at a controlled speed and adapted to the type of substrate on which the varnish is deposited and / or the composition of the varnish deposited.
  • the ink jet printing device for applying a varnish is characterized in that the device comprises a system for correcting at least one lateral deviation of the printing by the device.
  • the present invention relates to a printing device intended in particular for the deposition of varnish on the surface of a substrate regardless of the viscosity of this varnish.
  • the printing device is controlled by a control computer that controls the various workstations and also collects information from different sensors. These sensors provide, for example, position information of the substrates, configuration information of the substrates or validation information following a correctly performed operation or not.
  • the substrates awaiting printing are placed in an input magazine having a capacity defined according to the nature of the substrate and the needs for printing.
  • the input store is designed to accept several thousand substrates of a nature, of thickness up to 800 ⁇ m and of variable dimensions, for example between a credit card type format up to a format of type A0, and possibly at least one side is plastic.
  • a substrate gripping device makes it possible to take the substrates out of the input magazine and to arrange them on a conveyor to move them along a work line comprising several workstations.
  • the first workstation of the chain is a feeder with indexing of the substrate which allows the positioning relative to two reference edges or the detection of a marker printed on the substrate.
  • a sensor will detect the position information and transmit it to the computer over a wired or wireless network. This information stored in memory in the computer will then be reused at other workstations, controlled by the computer. Controls are also performed to detect the presence of a single substrate at each post of the conveyor.
  • the second workstation is the device for projecting the product to be applied to the support or substrate.
  • This projection device comprises a reservoir (7) which contains the viscous product to be sprayed.
  • products contained in the reservoir are varnish, scratch-off ink, conductive ink, printing ink or glue with average viscosities which may be of the order of 100 even 1000 centipoises, but also viscosities of the order of ten centipoises.
  • the reservoir can be fed, for example, manually or automatically by a supply circuit or semi-automatically by an operator-controlled device.
  • the reservoir (7) is connected to a pressurizing device.
  • the projection system requires indeed a determined pressure to have a good operation.
  • the pressurizing device (8) therefore comprises means for controlling and regulating the pressure of the product sent towards the nozzles, in a nonlimiting manner controlled by the computer.
  • the nozzles fed directly by the pressurizing device (8) are all driven, individually or collectively, by a control device (9).
  • nozzles without limitation controlled by the computer.
  • the nozzles are aligned and mounted in a ramp, thereby forming a nozzle manifold (12).
  • Each nozzle is constituted by a hollow structure which is vibrated by a piezoelectric actuator glued to the resonator formed by mounting the nozzle in a ramp.
  • the piloting of each nozzle is a piezoelectric process, that is to say that the product is projected by a vibration controlled by electrical excitation.
  • the nozzles spaced a tenth to several hundredths of a millimeter, preferably between 0.01 mm and 0.1 mm, thus make it possible to cover a precise surface.
  • the laying zone is defined for each substrate by a parameter file contained in a memory zone of the computer, concerning the shape of the zone, its position on the substrate relative to the reference points of the substrate, the quantity of product to be sprayed, control software of the machine using this information to translate them into parameters of relative displacement of the substrate and the nozzles, selective control of the nozzles and repetition of offset passage of the substrate in front of the nozzles to produce if necessary contiguous lines.
  • the post that succeeds the projection machine is the drying oven.
  • This oven allows to completely or partially dry the projected product.
  • the drying depending on the product applied, can be achieved by infrared radiation in the case of an aqueous varnish or by a heated air stream for a glue or a scratchable ink or UV depending on the product projected.
  • the drying then allows the substrate to be stored in the outlet magazine, without the projected product being transferred to other substrates or the magazine with which the substrate is in contact.
  • a layer of varnish occupies an area on the almost rectangular substrate, the corners of which are rounded.
  • a margin not covered with projected product is left on the periphery of the face of the substrate.
  • a layer of thermally reactivatable adhesive is produced, according to a pattern, for example a small rectangle rounded at its corners.
  • Different patterns of scratchable ink are placed on other areas, such as an arrow, a star or any other pattern including, without limitation, a contour formed by angles and straight lines and / or curves.
  • the piezoelectric control makes it possible to regulate the projection of material in duration and in power.
  • the laying areas are then defined by this digital method with an accuracy of the order of 0.05 mm.
  • the machine can therefore pose a point or to cover the entire surface of a substrate.
  • the laying zone is defined for each substrate by a parameter file concerning the shape of the zone, its position on the substrate relative to the reference points of the substrate, the amount of product to be sprayed.
  • a machine control software uses this information to translate them into parameters of relative displacement of the substrate and the nozzles, into selective nozzle control parameters, and into repeated flow reiteration parameters of the substrate in front of the nozzles to produce lines if necessary. contiguous.
  • the working line may comprise other additional workstations which allow for example the assembly of different parts together, in the case of an application of glue on specific contact areas.
  • the electro-acoustic control of each of the nozzles (12) involves a piezoelectric actuator activated by a particular voltage.
  • This control is controlled by a device for controlling and regulating the shape of the voltaic wave so that the shape of the voltaic wave which ensures the expulsion of the varnish and its deposition on the substrate has a rising edge (2). from a voltage value corresponding to the state of a varnish nozzle at rest (1) to a value which forms a phase plate (3), this plate (3) thus defining the ejection phase of the varnish loaded into the nozzle.
  • the intensity of the actuator then changes in proportion to the voltage of the wave.
  • the voltaic signal then has a polarity inversion (4) of the voltage up to a value defining a plateau (5) of duration which itself corresponds to the duration of reloading of the varnish nozzle.
  • the duration of the tray which corresponds to the reloading of the varnish in the nozzle is equal to that of the plate corresponding to the ejection of the varnish of the nozzle.
  • the wave of this signal ends with a falling edge (6) during which the return of the voltaic signal to the value of the signal at rest (1).
  • the duration of the ejection preparation tray is between 10 and 200 ⁇ s during the rising edge of the signal.
  • the shape of the voltaic wave shows a rising edge which has an intermediate value between the value of the voltaic signal at rest and the value of the signal at the level of the phase plate of the expulsion of the varnish.
  • the plateau of this intermediate value corresponds to a step of preparation of the ejection of the varnish before the actual expulsion.
  • the value of the duration of the intermediate plateau, during the rising edge of the signal is approximately equal to half the value of the duration of the preparation plateau.
  • the value of this plate is defined in particular according to the viscosity of the varnish. It thus allows a refill of the varnish in the nozzle by pausing during the load to prevent a rise of air in the nozzle from its expulsion port.
  • the rising edge may have several intermediate plates for the varnish charge.
  • the number and value of each of these trays is then a function of the viscosity of the varnish.
  • this succession of trays of reduced respective duration leads to the formation of a growing, continuous and progressive loading of the varnish in the nozzle, which may have the appearance of a curve or a straight line.
  • the varnish used has a viscosity of 4 to 100 mPa.s.
  • the height of the tray or trays is defined by the type of substrate detected and used during printing.
  • the figure 1 presents an example of a waveform of a voltaic signal in its most general aspects.
  • the control and regulating device (10) allows control and adjustment of the values and durations of the different trays of the voltaic wave and therefore of the shape of the wave as a function of at least one parameter of the printing , for example a characteristic of the substrate or varnish intended to be deposited on the substrate surface.
  • This characteristic may be for example the viscosity of the varnish, the temperature of the varnish or substrate, the type of surface on which the ink is projected, the desired final quality or the speed of passage of the substrate under the nozzle.
  • control and regulation device (10) is in connection with a storage means which integrates one or more databases including in particular waveforms, but also one or more characteristics of the voltaic wave, such as the height of the tray (s), their durations, their numbers, or even the possible ratios of the heights of these trays, whose values of these characteristics are correlated with one or more parameters of the printing.
  • the parameters which are mainly taken into account for regulating certain parameters of the voltaic wave are the viscosity and / or the composition of the varnish used and / or the substrate intended to be covered.
  • each of the nozzles of the device incorporates a heating resistor (13) which, connected to a device (10) for control of the viscosity of the drop of the varnish in the nozzle, makes it possible to control and regulate the temperature of the varnish and thus to carry out a precise control of its viscosity.
  • the resistor (13) heater is housed in the nozzle (12) upstream of the nozzle ejection orifice.
  • this control device (10) is also connected with a storage means that integrates one or more databases including in particular at least one predefined temperature value of the resistor (13) for obtaining data. a particular viscosity value of the varnish at the outlet of the nozzle.
  • This temperature value is established according to the composition of the varnish to be deposited which is prerecorded in the storage means.
  • This correlation between a value of temperature necessary for the resistance and the composition of a varnish can be obtained, for example, by means of a calculator integrating a mathematical function connecting the viscosity of the varnish of determined composition to a temperature value. .
  • This temperature in the nozzles is between 10 and 50 ° Celsius.
  • the one or more control and regulating devices (10) may be preprogrammed by a user at a suitable interface by which the user defines the varnish and / or the substrate used, or by a probe (11) or sensors that perform measurements to detect one or more parameters necessary to select the shape or characteristic of the voltaic wave signal, or to determine the temperature required for resistance to the varnish has a viscosity within a defined range, or even reaches a particular value.
  • the probe (11) and / or the sensors are thus preferably positioned upstream of the heating resistor and the piezoelectric actuator relative to the direction of movement of the varnish in the printing nozzles. A downstream positioning would allow correction of the voltaic wave once a first deposit of varnish already made. This positioning upstream of the heating resistor allows therefore a setting of the voltaic wave without a first deposit "test" varnish need to be performed.
  • the printing device of the invention is suitable for varnishes which incorporate in their composition at least one photoinitiator for the activation of the polymerization of the varnish.
  • This photoinitiator is generally activated by radiation according to one or more particular wavelengths which form one or more free radicals.
  • the wavelengths used correspond to those of ultraviolet (U.V.) radiation.
  • U.V. ultraviolet
  • the adaptation of the device therefore involves the positioning of one or more U.V. lamps downstream of the printing nozzles relative to the direction of movement of the substrate in the device.
  • the wavelengths used are of the order of 200 to 400 nm. This selection of the wavelength is a function of the type of photoinitiators incorporated in the composition of the varnish deposited on the substrate.
  • the printing device of the invention comprises a drying station with one or more infrared radiation lamps (I.R.) which perform a pre-drying of the deposited varnish.
  • I.R. infrared radiation lamps
  • the positioning of these I.R. lamps with respect to the substrate and the speed of displacement of the substrate in front of these lamps are determined according to an optimum distance predefined as a function of at least one characteristic of the deposited varnish and the type of substrate covered.
  • These pre-drying parameters are predefined in a storage means in relation to a control and regulation device according to an embodiment similar to that mentioned above.
  • the IR lamps used have emissions in different wavelength intervals.
  • the power of each of the lamps is thus controlled and regulated by a device adapted to the management of the combination of radiation from the lamps.
  • the management device is here also associated with a storage means integrating a programming of the radiation specific to each lamp according to the type of coated substrate and / or at least one characteristic of the deposited varnish.
  • the lamps of the drying station radiate with wavelengths between 0.5 and 8 microns.
  • the combination of wavelengths for a printed paper-type substrate is based on a power of about 100% for the average wavelengths and a power of about 50% for the short wavelengths.
  • the combination of wavelengths for a plastic-type substrate is based on a power of about 80% for the average wavelengths and a very low power, or even zero for the wavelengths. short.
  • the device integrates a zone marking verification system intended to be printed.
  • This system is based on a reading station that reads and determines the position of the areas to be covered, is moved by electromechanical processes so that a grinding guide can follow a grinding line and ensure a perfect location between the printed medium and the new printed area.
  • This grinding line is a line of high contrast, ideally black, printed with the printing pattern of the substrate, called background printing.
  • the reading station then takes this rectification line as a reference to allow a calculation of a lateral deviation with respect to the direction of movement of the substrate relative to the nozzles that deposit the varnish. From the measured deviation, the rectification guide performs a correction of the path by modifying it accordingly so that the rectification line remains strictly centered with the reading system.

Abstract

The device has a displacement unit for displacing a substrate e.g. paper, between working stations. Multiple nozzles (12) are placed in a module forming a print head, where each nozzle is vibrated by a piezoelectric actuator such that excitation of the actuator determines dimension and shape of drop of varnish. The actuator of one of the nozzles is connected to a controlling and adjusting device (10) that controls and adjusts shape of a voltaic wave for expulsion of the varnish drop from a tube according to viscosity and/or composition of varnish to be deposited.

Description

La présente invention se rapporte au domaine des machines d'impression par jet d'encre sans contact physique avec un substrat destiné à être recouvert d'une vernis, et plus particulièrement au domaine des dispositif d'impression par une technique piézo-électrique adaptée en fonction du vernis d'impression utilisé.The present invention relates to the field of inkjet printing machines without physical contact with a substrate intended to be coated with a varnish, and more particularly to the field of printing devices by a piezoelectric technique adapted to function of the printing varnish used.

Au cours d'une impression, une encre est déposée sur la surface d'un substrat, ce substrat pouvant être, par exemple, du papier ou du plastique. Il est alors courant de recouvrir la surface imprimée de ce substrat par une couche de protection. Cette couche de protection complète la fixation de l'image imprimée sur le substrat tout en garantissant la résistance de l'impression contre certaines agressions extérieures comme par exemple des projections, voire la lumière, la chaleur ou l'humidité ou permet de créer des effets visuels différents en imprimant des motifs en vernis dans certaines zones. Le dépôt de cette couche de protection sur le substrat imprimé est généralement effectué en faisant intervenir une impression par Flexographie Offset, Sérigraphie. Le vernis permet aussi de personnaliser le document en faisant apparaître des zones avec des motifs en vernis et d'autres zones sans vernis.During printing, an ink is deposited on the surface of a substrate, which substrate may be, for example, paper or plastic. It is then common to cover the printed surface of this substrate with a protective layer. This protective layer completes the fixation of the printed image on the substrate while guaranteeing the resistance of the printing against certain external aggressions such as projections, even light, heat or moisture or allows to create effects different visuals by printing varnish patterns in certain areas. The deposition of this protective layer on the printed substrate is generally carried out using an Offset Flexographic Printing, Silkscreen printing. The varnish can also customize the document by showing areas with varnish patterns and other areas without varnish.

La demande de brevet EP174960 se rapporte à une machine numérique à jet d'encre pour la pose d'un revêtement avec une viscosité moyenne sur un substrat de revêtement variable grâce à buses formées par des aiguilles creuses mises en vibration par un actionneur piézo-électrique collé sur un résonateur formé par le montage de l'aiguille creuse. La dimension et la forme de la goutte de matière qui se trouve alors déposée sur la surface du substrat est fonction de la durée et de la puissance de l'excitation de l'actionneur. Toutefois un tel dispositif, s'il permet le dépôt de gouttes de vernis avec des viscosités moyennes ou élevées qui sont de l'ordre du millier de centipoises, n'est pas adapté pour assurer une éjection optimale d'un vernis avec une viscosité beaucoup plus faible.The patent application EP174960 Refers to a digital ink jet machine for laying a coating with medium viscosity on a variable coating substrate by means of nozzles formed by hollow needles vibrated by a piezoelectric actuator glued to a formed resonator by mounting the hollow needle. The size and shape of the drop of material which is then deposited on the surface of the substrate is a function of the duration and the power of the excitation of the actuator. However, such a device, if it allows the deposition of varnish drops with medium or high viscosities which are of the order of a thousand centipoise, is not suitable to ensure optimum ejection of a varnish with a much lower viscosity.

La présente invention a pour objectif de palier un ou plusieurs inconvénients de l'art antérieur en fournissant dispositif adapté pour un dépôt optimisé d'une encre de couverture sur la surface d'un substrat indépendamment de sa viscosité et du substrat recouvert.It is an object of the present invention to overcome one or more disadvantages of the prior art by providing a device adapted for optimized deposition of a cover ink on the surface of a substrate regardless of its viscosity and the coated substrate.

Cet objectif est atteint grâce à un dispositif d'impression à jet d'encre pour la pose d'un vernis formant un revêtement sur une surface d'un substrat comprenant au moins :

  • un magasin d'entrée,
  • un magasin de sortie,
  • un moyen informatique de gestion des opérations sur chacun des postes de travail,
  • un moyen de déplacement du substrat entre les différents postes de travail,
  • un moyen de préhension et de transfert du substrat depuis le magasin d'entrée vers le moyen de déplacement et depuis le moyen de déplacement vers le magasin de sortie,
  • une pluralité de buses logées dans un module formant une tête d'impression, au moins une des buses étant alimentée par un réservoir contenant du vernis à projeter sur le substrat, chacune des buses étant mise en vibration par un actionneur piézo-électrique de sorte que l'excitation de l'actionneur en durée et en puissance détermine la dimension et la forme de la goutte de vernis,
  • un poste de pose pour effectuer la pose du produit dans une zone déterminé du substrat,
caractérisé en ce que l'actionneur piézo-électrique d'au moins une buse est connecté à un dispositif de commande et de régulation de la forme de l'onde voltaïque d'expulsion de la goutte de vernis de la buse en fonction de la viscosité et/ou de la composition du vernis à déposer.This objective is achieved by means of an inkjet printing device for laying a lacquer forming a coating on a surface of a substrate comprising at least:
  • an entrance shop,
  • an outlet store,
  • a computerized management of operations on each of the workstations,
  • means for moving the substrate between the different workstations,
  • means for gripping and transferring the substrate from the input magazine to the moving means and from the moving means to the output magazine,
  • a plurality of nozzles housed in a module forming a print head, at least one of the nozzles being fed by a tank containing spray paint on the substrate, each of the nozzles being vibrated by a piezoelectric actuator so that the excitation of the actuator in duration and in power determines the size and the shape of the drop of varnish,
  • a laying station for laying the product in a determined area of the substrate,
characterized in that the piezoelectric actuator of at least one nozzle is connected to a device for controlling and regulating the shape of the voltaic wave of expulsion of the varnish drop of the nozzle according to the viscosity and / or the composition of the varnish to be deposited.

Selon une variante de réalisation de l'invention, le dispositif d'impression à jet d'encre pour la pose d'un vernis est caractérisé en ce que la forme de l'onde voltaïque d'expulsion comprend :

  • un signal de tension correspondant à l'état d'une buse de vernis au repos,
  • un front montant du voltage jusqu'à un plateau formant la phase d'éjection,
  • une inversion de polarité de la tension jusqu'à un plateau de durée correspondant à la durée de rechargement de la buse en vernis,
  • un front descendant qui assure le retour du signal voltaïque à son niveau de repos.
According to an alternative embodiment of the invention, the ink-jet printing device for applying a varnish is characterized in that the form of the voltaic expulsion wave comprises:
  • a voltage signal corresponding to the state of a varnish nozzle at rest,
  • a rising edge of the voltage up to a plateau forming the ejection phase,
  • a polarity inversion of the voltage up to a plateau of duration corresponding to the duration of reloading of the varnished nozzle,
  • a falling edge which ensures the return of the voltaic signal to its rest level.

Selon une particularité de cette variante de réalisation, le dispositif d'impression à jet d'encre pour la pose d'un vernis est caractérisé en ce que la durée du plateau du rechargement de la buse en vernis est égale à celle du plateau correspondant à la phase d'éjection du vernis.According to a feature of this variant embodiment, the ink-jet printing device for applying a varnish is characterized in that the duration of the plate of the refilling of the varnish nozzle is equal to that of the plate corresponding to the ejection phase of the varnish.

Selon une particularité de cette variante de réalisation, le dispositif d'impression à jet d'encre pour la pose d'un vernis est caractérisé en ce que le front montant comprend au moins un plateau positionné à une valeur intermédiaire entre la valeur du signal voltaïque de repos et la valeur du signal au niveau du plateau d'éjection, ce plateau avec une valeur intermédiaire correspondant à la préparation de l'éjection.According to a feature of this variant embodiment, the inkjet printing device for applying a varnish is characterized in that the rising edge comprises at least one plate positioned at an intermediate value between the value of the voltaic signal. of rest and the value of the signal at the level of the ejection plate, this plate with an intermediate value corresponding to the preparation of the ejection.

Selon une autre particularité de cette variante de réalisation, le dispositif d'impression à jet d'encre pour la pose d'un vernis est caractérisé en ce que le front montant présente une progression croissante et continue.According to another feature of this variant embodiment, the ink jet printing device for applying a varnish is characterized in that the rising edge has an increasing and continuous progression.

Selon une autre particularité de cette variante de réalisation, le dispositif d'impression à jet d'encre pour la pose d'un vernis est caractérisé en ce que la valeur et/ou la durée d'au moins un plateau et/ou la forme de l'onde voltaïque est prédéfinie et mise en corrélation avec au moins un type de vernis identifié dans au moins un moyen de mémorisation connecté au dispositif de contrôle et de régulation de la forme de l'onde voltaïque d'expulsion de la goutte de vernis de la buse, permettant la sélection des informations correspondant au type de vernis.According to another feature of this variant embodiment, the ink jet printing device for applying a varnish is characterized in that the value and / or the duration of at least one tray and / or the form of the voltaic wave is predefined and correlated with at least one type of varnish identified in at least one storage means connected to the device for controlling and regulating the shape of the voltaic wave of expulsion of the drop of varnish from the nozzle, allowing the selection of information corresponding to the type of varnish.

Selon une autre variante de réalisation de l'invention, le dispositif d'impression à jet d'encre pour la pose d'un vernis est caractérisé en ce qu'au moins une buse du dispositif intègre une résistance chauffante connectée à un dispositif de contrôle de la viscosité de la goutte de vernis dans la buse, le dispositif de contrôle intégrant un moyen de commande et de régulation de la température de la goutte de vernis dans la buse.According to another embodiment of the invention, the ink jet printing device for applying a varnish is characterized in that at least one nozzle of the device incorporates a heating resistor connected to a control device. the viscosity of the drop of varnish in the nozzle, the control device incorporating a means for controlling and regulating the temperature of the drop of varnish in the nozzle.

Selon une particularité de cette variante de réalisation, le dispositif d'impression à jet d'encre pour la pose d'un vernis est caractérisé en ce que le dispositif de contrôle de la viscosité de la goutte est connecté à un moyen de mémoire intégrant au moins une base de donnée corrélant au moins une température prédéfinie de la résistance à une viscosité du vernis d'un type donné utilisé en sortie de buse en fonction de la composition du vernis à déposer.According to a feature of this variant embodiment, the ink jet printing device for applying a varnish is characterized in that the device for controlling the viscosity of the drop is connected to a memory means integrating with the less a database correlating at least a predetermined temperature of the resistance to a viscosity of the varnish of a given type used at the nozzle outlet according to the composition of the varnish to be deposited.

Selon une autre variante de réalisation de l'invention, le dispositif d'impression à jet d'encre pour la pose d'un vernis est caractérisé en ce que la buse comprend une sonde de mesure de la viscosité du vernis en amont de l'actionneur piézo-électrique et/ou de la résistance chauffante.According to another variant embodiment of the invention, the ink-jet printing device for applying a varnish is characterized in that the nozzle comprises a probe for measuring the viscosity of the varnish upstream of the coating. piezoelectric actuator and / or heating resistor.

Selon une autre variante de réalisation de l'invention, le dispositif d'impression à jet d'encre pour la pose d'un vernis est caractérisé en ce que le dispositif d'impression à jet d'encre est associé à un moyen de programmation du dispositif de commande et de régulation de la forme de l'onde voltaïque d'expulsion de la goutte et/ou du dispositif de contrôle de la viscosité de la goutte de vernis dans la buse.According to another embodiment of the invention, the ink jet printing device for applying a varnish is characterized in that the ink jet printing device is associated with a programming means. the device for controlling and regulating the shape of the voltaic wave of expulsion of the drop and / or the device for controlling the viscosity of the drop of varnish in the nozzle.

Selon une autre variante de réalisation de l'invention, le dispositif d'impression à jet d'encre pour la pose d'un vernis est caractérisé en ce que le dispositif d'impression comprend au moins une lampe à U.V. en aval du poste de dépôt du vernis qui présente une émission dans une longueur d'onde adaptée à l'activation d'au moins un photo-initiateur de la composition du vernis spécifique du support du substrat imprimé.According to another variant embodiment of the invention, the inkjet printing device for applying a varnish is characterized in that the printing device comprises at least one UV lamp downstream from the deposit of the varnish which presents an emission in a length waveform adapted to activate at least one photoinitiator of the composition of the specific varnish of the support of the printed substrate.

Selon une autre variante de réalisation de l'invention, le dispositif d'impression à jet d'encre pour la pose d'un vernis est caractérisé en ce que le dispositif d'impression comprend au moins une lampe à Infrarouge positionnée en face du substrat et arrangée en amont de la lampe à U.V. pour pré-sécher et tendre le vernis déposé sur le substrat, le positionnement étant défini selon une distance optimale en fonction du substrat sur lequel le vernis est déposé et/ou de la composition du vernis déposé.According to another embodiment of the invention, the ink jet printing device for applying a varnish is characterized in that the printing device comprises at least one infrared lamp positioned in front of the substrate. and arranged upstream of the UV lamp to pre-dry and stretch the varnish deposited on the substrate, the positioning being defined at an optimum distance depending on the substrate on which the varnish is deposited and / or the composition of the varnish deposited.

Selon une particularité de cette variante de réalisation, le dispositif d'impression à jet d'encre pour la pose d'un vernis est caractérisé en ce qu'au moins une longueur d'onde de la lampe à Infrarouge est adaptée pour fournir un pré-séchage et une tension de vernis optimale en fonction du substrat sur lequel le vernis est déposé et/ou de la composition du vernis déposé.According to a feature of this variant embodiment, the ink jet printing device for applying a varnish is characterized in that at least one wavelength of the infrared lamp is adapted to provide a pre-painted area. drying and an optimal varnish tension according to the substrate on which the varnish is deposited and / or the composition of the varnish deposited.

Selon une particularité de cette variante de réalisation, le dispositif d'impression à jet d'encre pour la pose d'un vernis est caractérisé en ce que le dispositif d'impression comprenant au moins deux lampes Infrarouge émettant dans des intervalles de longueurs d'onde différentes, la puissance respective de chacune des lampes est commandée et contrôlée par un dispositif gérant une combinaison des rayonnement des lampes Infrarouge adaptée à l'obtention d'un pré-séchage en fonction du substrat sur lequel le vernis est déposé et/ou de la composition du vernis déposé.According to a feature of this variant embodiment, the ink jet printing device for applying a varnish is characterized in that the printing device comprising at least two infrared lamps emitting in length intervals of wave, the respective power of each of the lamps is controlled and controlled by a device managing a combination of the radiation of the infrared lamps adapted to obtain a pre-drying depending on the substrate on which the varnish is deposited and / or the composition of the varnish deposited.

Selon une particularité de cette variante de réalisation, le dispositif d'impression à jet d'encre pour la pose d'un vernis est caractérisé en ce que le dispositif comprend un moyen de déplacement du substrat en face et à une distance déterminée d'au moins une lampe à Infrarouge selon une vitesse contrôlée et adaptée au type de substrat sur lequel le vernis est déposé et/ou de la composition du vernis déposé.According to a feature of this variant embodiment, the ink jet printing device for applying a varnish is characterized in that the device comprises means for moving the substrate opposite and at a determined distance from less an infrared lamp at a controlled speed and adapted to the type of substrate on which the varnish is deposited and / or the composition of the varnish deposited.

Selon une autre variante de réalisation de l'invention, le dispositif d'impression à jet d'encre pour la pose d'un vernis est caractérisé en ce que le dispositif comprend un système de correction d'au moins une déviation latérale de l'impression par le dispositif.According to another embodiment of the invention, the ink jet printing device for applying a varnish is characterized in that the device comprises a system for correcting at least one lateral deviation of the printing by the device.

L'invention, avec ses caractéristiques et avantages, ressortira plus clairement à la lecture de la description faite en référence aux dessins annexés dans lesquels :

  • la figure 1 représente un schéma général d'une onde voltaïque d'expulsion d'encre de recouvrement générée par l'actionneur piézo-électrique d'au moins une buse d'un dispositif d'impression de l'invention,
  • la figure 2 représente un exemple de dispositif de projection intégrant les dispositifs de contrôle et de régulation de l'invention.
The invention, with its features and advantages, will emerge more clearly on reading the description given with reference to the appended drawings in which:
  • the figure 1 represents a general diagram of a voltaic surge ink expulsion wave generated by the piezoelectric actuator of at least one nozzle of a printing device of the invention,
  • the figure 2 represents an example of a projection device incorporating the control and regulation devices of the invention.

Il convient avant tout de considérer que dans le présent document, les termes « encre de recouvrement », « produit visqueux » et « vernis » doivent être compris comme des synonymes.It should first of all be considered that in this document the terms "recovery ink", "viscous product" and "varnish" should be understood as synonyms.

La présente invention porte sur un dispositif d'impression destiné notamment au dépôt de vernis sur la surface d'un substrat indépendamment de la viscosité de ce vernis.The present invention relates to a printing device intended in particular for the deposition of varnish on the surface of a substrate regardless of the viscosity of this varnish.

Le dispositif d'impression est contrôlée par un ordinateur de contrôle qui commande les différents postes de travail et également qui collecte les informations de différents capteurs. Ces capteurs fournissent par exemple, des informations de position des substrats, des informations de configuration des substrats ou des informations de validation suite à une opération correctement effectuée ou non. Les substrats en attente d'impression sont placés dans un magasin d'entrée ayant une capacité définie en fonction de la nature du substrat et des besoins pour l'impression. Dans un exemple de réalisation, le magasin d'entrée est prévu pour accepter plusieurs milliers de substrats de nature, d'épaisseur jusqu'à 800µm et de dimensions variables, par exemple entre un format de type carte de crédit jusqu'à un format de type A0, et éventuellement dont au moins une face est en plastique. Une fois le processus de pose terminé, les substrats sont stockés dans un magasin de sortie ayant généralement la même capacité que le magasin d'entrée. Un dispositif de préhension des substrats permet de sortir les substrats du magasin d'entrée et de les disposer sur un convoyeur pour les déplacer le long d'une chaîne de travail comportant plusieurs postes de travail. Le premier poste de travail de la chaîne est un margeur avec indexage du substrat qui permet la mise en position par rapport à deux bords de référence ou la détection d'un repère imprimé sur le substrat. Un capteur va détecter les informations de positions et les transmettre à l'ordinateur par un réseau câblé ou sans fils. Ces informations stockées en mémoire dans l'ordinateur seront ensuite réutilisées à d'autres postes de travail, pilotés par l'ordinateur. Des contrôles sont également effectués afin de détecter la présence d'un substrat unique à chaque poste du convoyeur.The printing device is controlled by a control computer that controls the various workstations and also collects information from different sensors. These sensors provide, for example, position information of the substrates, configuration information of the substrates or validation information following a correctly performed operation or not. The substrates awaiting printing are placed in an input magazine having a capacity defined according to the nature of the substrate and the needs for printing. In an exemplary embodiment, the input store is designed to accept several thousand substrates of a nature, of thickness up to 800 μm and of variable dimensions, for example between a credit card type format up to a format of type A0, and possibly at least one side is plastic. Once the installation process is complete, the substrates are stored in an outlet store having generally the same capacity as the input store. A substrate gripping device makes it possible to take the substrates out of the input magazine and to arrange them on a conveyor to move them along a work line comprising several workstations. The first workstation of the chain is a feeder with indexing of the substrate which allows the positioning relative to two reference edges or the detection of a marker printed on the substrate. A sensor will detect the position information and transmit it to the computer over a wired or wireless network. This information stored in memory in the computer will then be reused at other workstations, controlled by the computer. Controls are also performed to detect the presence of a single substrate at each post of the conveyor.

Le second poste de travail est le dispositif de projection du produit à appliquer sur le support ou substrat. Ce dispositif de projection comporte un réservoir (7) qui contient le produit visqueux à projeter. Des exemples non limitatifs de produits contenus dans le réservoir sont du vernis, de l'encre grattable, de l'encre conductrice, de l'encre d'impression ou de la colle avec des viscosités moyennes qui peuvent être de l'ordre de 100 voire 1000 centipoises, mais également des viscosités de l'ordre d'une dizaine de centipoises. L'alimentation du réservoir peut être effectuée, par exemple, manuellement ou automatiquement par un circuit d'alimentation ou encore de façon semi-automatique par un dispositif piloté par un opérateur. Le réservoir (7) est relié à un dispositif de mise en pression. Le système de projection nécessite en effet une pression déterminée pour avoir un bon fonctionnement. Le dispositif (8) de mise en pression comporte donc un moyen de contrôle et de régulation de la pression du produit envoyé vers les buses, de manière non limitative commandé par l'ordinateur. Les buses alimentées directement par le dispositif (8) de mise en pression, sont toutes pilotées, individuellement ou collectivement, par un dispositif (9) de pilotage des buses, de manière non limitative commandées par l'ordinateur. Les buses sont alignées et montées dans une rampe, formant ainsi une rampe de buses (12). Chaque buse est constituée par une structure creuse qui est mise en vibration par un actionneur piézo-électrique collé sur le résonateur formé par le montage de la buse en rampe. Le pilotage de chaque buse est un procédé piézo-électrique, c'est-à-dire que le produit est projeté par une vibration contrôlée par une excitation électrique. Les buses espacées de un dixième à plusieurs centièmes de millimètres, préférentiellement entre 0,01 mm et 0,1 mm, permettent ainsi de couvrir une surface précise.The second workstation is the device for projecting the product to be applied to the support or substrate. This projection device comprises a reservoir (7) which contains the viscous product to be sprayed. Non-limiting examples of products contained in the reservoir are varnish, scratch-off ink, conductive ink, printing ink or glue with average viscosities which may be of the order of 100 even 1000 centipoises, but also viscosities of the order of ten centipoises. The reservoir can be fed, for example, manually or automatically by a supply circuit or semi-automatically by an operator-controlled device. The reservoir (7) is connected to a pressurizing device. The projection system requires indeed a determined pressure to have a good operation. The pressurizing device (8) therefore comprises means for controlling and regulating the pressure of the product sent towards the nozzles, in a nonlimiting manner controlled by the computer. The nozzles fed directly by the pressurizing device (8) are all driven, individually or collectively, by a control device (9). nozzles, without limitation controlled by the computer. The nozzles are aligned and mounted in a ramp, thereby forming a nozzle manifold (12). Each nozzle is constituted by a hollow structure which is vibrated by a piezoelectric actuator glued to the resonator formed by mounting the nozzle in a ramp. The piloting of each nozzle is a piezoelectric process, that is to say that the product is projected by a vibration controlled by electrical excitation. The nozzles spaced a tenth to several hundredths of a millimeter, preferably between 0.01 mm and 0.1 mm, thus make it possible to cover a precise surface.

La zone de pose est définie pour chaque substrat par un fichier de paramétrage contenu dans une zone mémoire de l'ordinateur, concernant la forme de la zone, sa position sur le substrat par rapport aux repères du substrat, la quantité de produit à projeter, un logiciel de commande de la machine exploitant ces informations pour les traduire en paramètres de déplacement relatif du substrat et des buses, de commande sélective des buses et de réitération de passage décalé du substrat devant les buses pour produire si nécessaire de lignes jointives.The laying zone is defined for each substrate by a parameter file contained in a memory zone of the computer, concerning the shape of the zone, its position on the substrate relative to the reference points of the substrate, the quantity of product to be sprayed, control software of the machine using this information to translate them into parameters of relative displacement of the substrate and the nozzles, selective control of the nozzles and repetition of offset passage of the substrate in front of the nozzles to produce if necessary contiguous lines.

Le poste qui succède à la machine de projection est le four de séchage. Ce four permet de sécher complètement ou partiellement le produit projeté. Le séchage, en fonction du produit appliqué, peut être réalisé par un rayonnement Infrarouge dans le cas d'un vernis aqueux ou par un courant d'air chauffé pour une colle ou une encre grattable ou par UV en fonction du produit projeté. Le séchage permet ensuite au substrat d'être stocké dans le magasin de sortie, sans que le produit projeté ne se transfère sur d'autres substrats ou sur le magasin avec lesquels le substrat est en contact.The post that succeeds the projection machine is the drying oven. This oven allows to completely or partially dry the projected product. The drying, depending on the product applied, can be achieved by infrared radiation in the case of an aqueous varnish or by a heated air stream for a glue or a scratchable ink or UV depending on the product projected. The drying then allows the substrate to be stored in the outlet magazine, without the projected product being transferred to other substrates or the magazine with which the substrate is in contact.

La pose d'une couche de vernis est réalisée sur une face du substrat avant ou après une impression. Une couche de vernis occupe par exemple une zone sur le substrat quasiment rectangulaire, dont les coins sont arrondis. De manière non limitative, une marge non recouverte de produit projeté est laissée sur le pourtour de la face du substrat. Sur une zone d'un substrat une couche de colle ré-activable thermiquement est réalisée, selon un motif, par exemple de petit rectangle arrondi en ses coins. Des motifs différents d'encre grattable sont posés sur d'autres zones, comme par exemple une flèche, une étoile ou tout autre motif comportant, de manière non limitative, un contour formé d'angles et de lignes droites et/ou de courbes.The laying of a layer of varnish is performed on one side of the substrate before or after printing. For example, a layer of varnish occupies an area on the almost rectangular substrate, the corners of which are rounded. In a nonlimiting manner, a margin not covered with projected product is left on the periphery of the face of the substrate. On an area of a substrate a layer of thermally reactivatable adhesive is produced, according to a pattern, for example a small rectangle rounded at its corners. Different patterns of scratchable ink are placed on other areas, such as an arrow, a star or any other pattern including, without limitation, a contour formed by angles and straight lines and / or curves.

En disposant deux machines, l'une avant l'impression, l'autre après l'impression et en chargeant les réservoirs de ces machines avec les produits visqueux appropriés différentes impressions sont réalisées, de manière non limitative, sur deux faces d'un substrat. Ces impressions sont, par exemple, des zones imprimées et protégées par un vernis, des zones imprimées et recouvertes d'une encre grattable ou des zones encollées ou encore une combinaison de ces différentes possibilités sur n'importe quelle face. L'impression sur les différentes faces est réalisée par un mécanisme de retournement entre une machine et la machine suivante ou précédente.By arranging two machines, one before printing, the other after printing and loading the reservoirs of these machines with the appropriate viscous products, different impressions are made, without limitation, on two sides of a substrate. . These prints are, for example, areas printed and protected by a varnish, printed areas and covered with a scratch-resistant ink or glued areas or a combination of these different possibilities on any face. The printing on the different faces is performed by a reversal mechanism between a machine and the next or previous machine.

La commande piézo-électrique permet de régler la projection de matière en durée et en puissance. Les zones de pose sont alors définies par ce procédé numérique avec une précision de l'ordre de 0,05 mm. La machine peut donc poser un point ou encore de recouvrir toute la surface d'un substrat. La zone de pose est définie pour chaque substrat par un fichier de paramétrage concernant la forme de la zone, sa position sur le substrat par rapport aux repères du substrat, la quantité de produit à projeter. Un logiciel de commande de la machine exploite ces informations pour les traduire en paramètres de déplacement relatif du substrat et des buses, en paramètres de commande sélective des buses et en paramètres de réitération de passage décalé du substrat devant les buses pour produire si nécessaire des lignes jointives.The piezoelectric control makes it possible to regulate the projection of material in duration and in power. The laying areas are then defined by this digital method with an accuracy of the order of 0.05 mm. The machine can therefore pose a point or to cover the entire surface of a substrate. The laying zone is defined for each substrate by a parameter file concerning the shape of the zone, its position on the substrate relative to the reference points of the substrate, the amount of product to be sprayed. A machine control software uses this information to translate them into parameters of relative displacement of the substrate and the nozzles, into selective nozzle control parameters, and into repeated flow reiteration parameters of the substrate in front of the nozzles to produce lines if necessary. contiguous.

Dans d'autres exemples de réalisation, la chaîne de travail peut comporter d'autres postes de travail additionnels qui permettent par exemple l'assemblage de différentes pièces entre elles, dans le cas d'une application de colle sur des zones de contact déterminées.In other exemplary embodiments, the working line may comprise other additional workstations which allow for example the assembly of different parts together, in the case of an application of glue on specific contact areas.

Le pilotage électro-acoustique de chacune des buses (12) fait intervenir un actionneur piézo-électrique activé par un voltage particulier. Ce pilotage est contrôlé par un dispositif de commande et de régulation de la forme de l'onde voltaïque de sorte que la forme de l'onde voltaïque qui assure l'expulsion du vernis et son dépôt sur le substrat présente un front montant (2) depuis une valeur de tension correspondant à l'état d'une buse de vernis au repos (1) jusqu'à une valeur qui forme un plateau de phase (3), ce plateau (3) définissant ainsi la phase d'éjection du vernis chargé dans la buse. L'intensité de l'actionneur évolue alors en proportion avec le voltage de l'onde. Le signal voltaïque présente ensuite une inversion de polarité (4) de la tension jusqu'à une valeur définissant un plateau (5) de durée qui, lui, correspond à la durée de rechargement de la buse en vernis. Selon un mode de réalisation préféré, la durée du plateau qui correspond au rechargement du vernis dans la buse est égale à celle du plateau correspondant à l'éjection du vernis de la buse. L'onde de ce signal se termine par un front descendant (6) au cours duquel le retour du signal voltaïque à la valeur du signal au repos (1). La durée du plateau de préparation de l'éjection est comprise entre 10 et 200 µs au cours du front montant du signal.The electro-acoustic control of each of the nozzles (12) involves a piezoelectric actuator activated by a particular voltage. This control is controlled by a device for controlling and regulating the shape of the voltaic wave so that the shape of the voltaic wave which ensures the expulsion of the varnish and its deposition on the substrate has a rising edge (2). from a voltage value corresponding to the state of a varnish nozzle at rest (1) to a value which forms a phase plate (3), this plate (3) thus defining the ejection phase of the varnish loaded into the nozzle. The intensity of the actuator then changes in proportion to the voltage of the wave. The voltaic signal then has a polarity inversion (4) of the voltage up to a value defining a plateau (5) of duration which itself corresponds to the duration of reloading of the varnish nozzle. According to a preferred embodiment, the duration of the tray which corresponds to the reloading of the varnish in the nozzle is equal to that of the plate corresponding to the ejection of the varnish of the nozzle. The wave of this signal ends with a falling edge (6) during which the return of the voltaic signal to the value of the signal at rest (1). The duration of the ejection preparation tray is between 10 and 200 μs during the rising edge of the signal.

Selon un mode de réalisation particulier, la forme de l'onde voltaïque montre un front montant qui présente une valeur intermédiaire située entre la valeur du signal voltaïque au repos et la valeur du signal au niveau du plateau de phase de l'expulsion du vernis. Le plateau de cette valeur intermédiaire correspond à une étape de préparation de l'éjection du vernis avant l'expulsion proprement dite. Selon un mode de réalisation particulier, la valeur de la durée du plateau intermédiaire, au cours du front montant du signal, est environ égale à la moitié de la valeur de la durée du plateau de préparation. La valeur de ce plateau est notamment définit en fonction de la viscosité du vernis. Il permet ainsi une recharge du vernis dans la buse en effectuant des pauses lors de la charge pour éviter une montée d'air dans la buse depuis son orifice d'expulsion. Selon un mode de réalisation préférentiel, le front montant peut présenter plusieurs plateaux intermédiaires pour la charge de vernis. Le nombre et la valeur de chacun de ces plateaux est alors fonction de la viscosité du vernis. Selon un mode de réalisation particulier, cette succession de plateaux de durée respective réduite conduit à la formation d'un chargement croissant, continu et progressif du vernis dans la buse, qui peut avoir l'aspect d'une courbe ou d'une droite. Idéalement, le vernis utilisé présente une viscosité de 4 à 100 mPa.s. Selon une autre particularité, la hauteur du ou des plateaux est définie par le type de substrat détecté et utilisé lors de l'impression.According to a particular embodiment, the shape of the voltaic wave shows a rising edge which has an intermediate value between the value of the voltaic signal at rest and the value of the signal at the level of the phase plate of the expulsion of the varnish. The plateau of this intermediate value corresponds to a step of preparation of the ejection of the varnish before the actual expulsion. According to a particular embodiment, the value of the duration of the intermediate plateau, during the rising edge of the signal, is approximately equal to half the value of the duration of the preparation plateau. The value of this plate is defined in particular according to the viscosity of the varnish. It thus allows a refill of the varnish in the nozzle by pausing during the load to prevent a rise of air in the nozzle from its expulsion port. According to a preferred embodiment, the rising edge may have several intermediate plates for the varnish charge. The number and value of each of these trays is then a function of the viscosity of the varnish. According to a particular embodiment, this succession of trays of reduced respective duration leads to the formation of a growing, continuous and progressive loading of the varnish in the nozzle, which may have the appearance of a curve or a straight line. Ideally, the varnish used has a viscosity of 4 to 100 mPa.s. According to another feature, the height of the tray or trays is defined by the type of substrate detected and used during printing.

La figure 1 présente un exemple de forme d'onde d'un signal voltaïque dans ses aspects les plus généraux.The figure 1 presents an example of a waveform of a voltaic signal in its most general aspects.

Le dispositif (10) de commande et de régulation permet un contrôle et un ajustement des valeurs et des durées des différents plateaux de l'onde voltaïque et donc de la forme de l'onde en fonction d'au moins un paramètre de l'impression, par exemple une caractéristique du substrat ou du vernis destiné à être déposé sur la surface substrat. Cette caractéristique peut être par exemple la viscosité du vernis, la température du vernis ou du substrat, le type de surface sur laquelle l'encre est projetée, la qualité finale recherchée ou encore la vitesse de passage du substrat sous la buse. Selon un mode de réalisation particulier, le dispositif (10) de commande et de régulation est en connexion avec un moyen de mémorisation qui intègre une ou plusieurs bases de données comprenant notamment des formes d'onde, mais également une ou plusieurs caractéristiques de l'onde voltaïque, telles que la hauteur du ou des plateaux, leurs durées, leurs nombres, voire les éventuels rapports des hauteurs de ces plateaux, dont les valeurs de ces caractéristiques sont corrélées à un ou plusieurs paramètre de l'impression. Selon un mode de réalisation préféré, les paramètres qui sont principalement pris en compte pour réguler certains paramètres de l'onde voltaïque sont la viscosité et/ou la composition, du vernis utilisé et/ou du substrat destiné à être recouvert.The control and regulating device (10) allows control and adjustment of the values and durations of the different trays of the voltaic wave and therefore of the shape of the wave as a function of at least one parameter of the printing , for example a characteristic of the substrate or varnish intended to be deposited on the substrate surface. This characteristic may be for example the viscosity of the varnish, the temperature of the varnish or substrate, the type of surface on which the ink is projected, the desired final quality or the speed of passage of the substrate under the nozzle. According to a particular embodiment, the control and regulation device (10) is in connection with a storage means which integrates one or more databases including in particular waveforms, but also one or more characteristics of the voltaic wave, such as the height of the tray (s), their durations, their numbers, or even the possible ratios of the heights of these trays, whose values of these characteristics are correlated with one or more parameters of the printing. According to a preferred embodiment, the parameters which are mainly taken into account for regulating certain parameters of the voltaic wave are the viscosity and / or the composition of the varnish used and / or the substrate intended to be covered.

Selon une variante de réalisation, chacune des buses du dispositif intègre une résistance (13) chauffante qui, connecté à un dispositif (10) de contrôle de la viscosité de la goutte du vernis dans la buse, permet de commander et de réguler la température du vernis et donc d'effectuer un contrôle avec précision de sa viscosité. La résistance (13) chauffante est logée dans la buse (12) en amont de l'orifice d'éjection de la buse. Selon un mode de réalisation particulier, ce dispositif (10) de contrôle est également connecté avec un moyen de mémorisation qui intègre une ou plusieurs bases de données comprenant notamment au moins une valeur de température prédéfinie de la résistance (13) pour l'obtention d'une valeur de viscosité particulière du vernis en sortie de buse. Cette valeur de température est établie en fonction de la composition du vernis à déposer qui est préenregistrée dans le moyen de mémorisation. Cette corrélation entre une valeur de température nécessaire à la résistance et la composition d'un vernis peut être obtenue, par exemple, par l'intermédiaire d'un calculateur intégrant une fonction mathématique reliant la viscosité du vernis de composition déterminée à une valeur de température. Cette température dans les buses est comprise entre 10 et 50°Celsius.According to an alternative embodiment, each of the nozzles of the device incorporates a heating resistor (13) which, connected to a device (10) for control of the viscosity of the drop of the varnish in the nozzle, makes it possible to control and regulate the temperature of the varnish and thus to carry out a precise control of its viscosity. The resistor (13) heater is housed in the nozzle (12) upstream of the nozzle ejection orifice. According to a particular embodiment, this control device (10) is also connected with a storage means that integrates one or more databases including in particular at least one predefined temperature value of the resistor (13) for obtaining data. a particular viscosity value of the varnish at the outlet of the nozzle. This temperature value is established according to the composition of the varnish to be deposited which is prerecorded in the storage means. This correlation between a value of temperature necessary for the resistance and the composition of a varnish can be obtained, for example, by means of a calculator integrating a mathematical function connecting the viscosity of the varnish of determined composition to a temperature value. . This temperature in the nozzles is between 10 and 50 ° Celsius.

Le ou les dispositifs (10) de commande et de régulation peuvent être préprogrammé par un utilisateur au niveau d'une interface adaptée par laquelle l'utilisateur définit le vernis et/ou le substrat utilisé, ou bien par une sonde (11) ou des capteurs qui effectuent des mesures permettant une détection d'un ou de plusieurs paramètres nécessaires à la sélection de la forme ou d'une caractéristique du signal de l'onde voltaïque, ou bien encore de la détermination de la température nécessaire à la résistance pour que le vernis présente une viscosité située dans un intervalle défini, voire atteigne une valeur particulière. La sonde (11) et/ou les capteurs se trouvent ainsi préférentiellement positionnés en amont de la résistance chauffante et de l'actionneur piézo-électrique par rapport au sens de déplacement du vernis dans les buses d'impression. Un positionnement en aval ne permettrait une correction de l'onde voltaïque qu'une fois un premier dépôt de vernis déjà effectué. Ce positionnement en amont de la résistance chauffante permet donc un réglage de l'onde voltaïque sans qu'un premier dépôt « test » de vernis n'ait besoin d'être effectué.The one or more control and regulating devices (10) may be preprogrammed by a user at a suitable interface by which the user defines the varnish and / or the substrate used, or by a probe (11) or sensors that perform measurements to detect one or more parameters necessary to select the shape or characteristic of the voltaic wave signal, or to determine the temperature required for resistance to the varnish has a viscosity within a defined range, or even reaches a particular value. The probe (11) and / or the sensors are thus preferably positioned upstream of the heating resistor and the piezoelectric actuator relative to the direction of movement of the varnish in the printing nozzles. A downstream positioning would allow correction of the voltaic wave once a first deposit of varnish already made. This positioning upstream of the heating resistor allows therefore a setting of the voltaic wave without a first deposit "test" varnish need to be performed.

Selon un mode de réalisation particulier, le dispositif d'impression de l'invention est adapté aux vernis qui intègrent dans leur composition au moins un photo-initiateur pour l'activation de la polymérisation du vernis. Ce photo-initiateur est généralement activé grâce à un rayonnement selon une ou plusieurs longueurs d'onde particulières qui forment un ou plusieurs radicaux libres. Selon un mode de réalisation général, les longueurs d'onde utilisée correspondent à celles d'un rayonnement à ultra-violet (U.V.). L'adaptation du dispositif fait donc intervenir le positionnement d'une ou de plusieurs lampes à U.V. en aval des buses d'impression par rapport au sens de déplacement du substrat dans le dispositif.According to a particular embodiment, the printing device of the invention is suitable for varnishes which incorporate in their composition at least one photoinitiator for the activation of the polymerization of the varnish. This photoinitiator is generally activated by radiation according to one or more particular wavelengths which form one or more free radicals. According to a general embodiment, the wavelengths used correspond to those of ultraviolet (U.V.) radiation. The adaptation of the device therefore involves the positioning of one or more U.V. lamps downstream of the printing nozzles relative to the direction of movement of the substrate in the device.

Préférentiellement, les longueurs d'onde utilisées sont de l'ordre de 200 à 400 nm. Cette sélection de la longueur d'onde est fonction du type de photo-initiateurs intégrés dans la composition du vernis déposé sur le substrat.Preferably, the wavelengths used are of the order of 200 to 400 nm. This selection of the wavelength is a function of the type of photoinitiators incorporated in the composition of the varnish deposited on the substrate.

Selon un mode de réalisation particulier, le dispositif d'impression de l'invention comprend un poste de séchage avec une ou plusieurs lampes à rayonnement Infrarouge (I.R.) qui effectuent un pré-séchage du vernis déposé. Le positionnement de ces lampes à I.R. par rapport au substrat et la vitesse de déplacement du substrat en face de ces lampes sont déterminés selon une distance optimale prédéfinie en fonction d'au moins une caractéristique du vernis déposée et du type de substrat recouvert. Ces paramètres de pré-séchage sont prédéfinis dans un moyen de mémorisation en relation avec un dispositif de contrôle et de régulation selon un mode de réalisation similaire à celui mentionné précédemment.According to a particular embodiment, the printing device of the invention comprises a drying station with one or more infrared radiation lamps (I.R.) which perform a pre-drying of the deposited varnish. The positioning of these I.R. lamps with respect to the substrate and the speed of displacement of the substrate in front of these lamps are determined according to an optimum distance predefined as a function of at least one characteristic of the deposited varnish and the type of substrate covered. These pre-drying parameters are predefined in a storage means in relation to a control and regulation device according to an embodiment similar to that mentioned above.

Selon un mode de réalisation particulier, les lampes à I.R. utilisées présentent des émissions dans des intervalles de longueurs d'onde différentes. La puissance de chacune des lampes est ainsi commandée et régulée par un dispositif adaptée pour la gestion de la combinaison des rayonnements des lampes. Le dispositif de gestion est, là également, associé à un moyen de mémorisation intégrant une programmation du rayonnement propre à chaque lampe en fonction du type de substrat recouvert et/ou d'au moins une caractéristique du vernis déposée. Selon un mode de réalisation particulier, les lampes du poste de séchage rayonnent avec des longueurs d'onde comprises entre 0,5 et 8 µm.According to a particular embodiment, the IR lamps used have emissions in different wavelength intervals. The power of each of the lamps is thus controlled and regulated by a device adapted to the management of the combination of radiation from the lamps. The management device is here also associated with a storage means integrating a programming of the radiation specific to each lamp according to the type of coated substrate and / or at least one characteristic of the deposited varnish. According to a particular embodiment, the lamps of the drying station radiate with wavelengths between 0.5 and 8 microns.

Dans le cas d'une utilisation d'une paire de longueurs d'onde, longueurs d'onde courtes comprises entre 0,5 et 3,2 µm et longueurs d'onde moyennes comprises entre 1,6 et 8 µm, la combinaison des longueurs d'onde pour un substrat de type papier imprimé s'appuie sur une puissance de l'ordre de 100% pour les longueurs d'onde moyennes et une puissance de l'ordre de 50% pour les longueurs d'onde courtes. De même, la combinaison des longueurs d'onde pour un substrat de type plastique s'appuie sur une puissance de l'ordre de 80% pour les longueurs d'onde moyennes et une puissance très faible, voire nulle pour les longueurs d'onde courtes.In the case of using a pair of wavelengths, short wavelengths between 0.5 and 3.2 μm and average wavelengths between 1.6 and 8 μm, the combination of wavelengths for a printed paper-type substrate is based on a power of about 100% for the average wavelengths and a power of about 50% for the short wavelengths. Similarly, the combination of wavelengths for a plastic-type substrate is based on a power of about 80% for the average wavelengths and a very low power, or even zero for the wavelengths. short.

Selon un mode de réalisation particulier, le dispositif intègre un système de vérification de traçage des zones destinée à être imprimées. Ce système s'appuie sur un poste de lecture qui lit et détermine la position des zones à recouvrir, est mû par des procédés électromécaniques afin que un guide de rectification puisse suivre une ligne de rectification et assurer un parfait repérage entre le support imprimé et la nouvelle zone imprimée. Cette ligne de rectification est une ligne à fort contraste, idéalement noire, imprimée avec le motif d'impression du substrat, dit impression de fond. Le poste de lecture prend alors cette ligne de rectification comme référence pour permettre un calcul d'une déviation latérale par rapport au sens de déplacement du substrat par rapport aux buses qui déposent le vernis. A partir de la déviation mesurée, le guide de rectification opère une correction de la trajectoire en la modifiant en conséquence de sorte que la ligne de rectification demeure rigoureusement centrée avec le système de lecture.According to a particular embodiment, the device integrates a zone marking verification system intended to be printed. This system is based on a reading station that reads and determines the position of the areas to be covered, is moved by electromechanical processes so that a grinding guide can follow a grinding line and ensure a perfect location between the printed medium and the new printed area. This grinding line is a line of high contrast, ideally black, printed with the printing pattern of the substrate, called background printing. The reading station then takes this rectification line as a reference to allow a calculation of a lateral deviation with respect to the direction of movement of the substrate relative to the nozzles that deposit the varnish. From the measured deviation, the rectification guide performs a correction of the path by modifying it accordingly so that the rectification line remains strictly centered with the reading system.

Il doit être évident pour les personnes versées dans l'art que la présente invention permet des modes de réalisation sous de nombreuses autres formes spécifiques sans l'éloigner du domaine d'application de l'invention comme revendiqué. Par conséquent, les présents modes de réalisation doivent être considérés à titre d'illustration mais peuvent être modifiés dans le domaine défini par la portée des revendications jointes.It should be obvious to those skilled in the art that the present invention allows embodiments in many other specific forms without departing from the scope of the invention as claimed. Therefore, the present embodiments should be considered by way of illustration but may be modified in the field defined by the scope of the appended claims.

Claims (15)

Dispositif d'impression à jet pour la pose d'un vernis formant un revêtement sur une surface d'un substrat comprenant au moins : - un magasin d'entrée, - un magasin de sortie, - un moyen informatique de gestion des opérations sur chacun des postes de travail, - un moyen de déplacement du substrat entre les différents postes de travail, - un moyen de préhension et de transfert du substrat depuis le magasin d'entrée vers le moyen de déplacement et depuis le moyen de déplacement vers le magasin de sortie, - une pluralité de buses (12) logées dans un module formant une tête d'impression, au moins une des buses étant alimentée par un réservoir (7) contenant du vernis à projeter sur le substrat, chacune des buses étant mise en vibration par un actionneur piézo-électrique de sorte que l'excitation de l'actionneur en durée et en puissance détermine la dimension et la forme de la goutte de vernis, - un poste de pose pour effectuer la pose du produit dans une zone déterminé du substrat, caractérisé en ce que, le réservoir contient du vernis à projeter sur le substrat, l'actionneur piézo-électrique d'au moins une buse est connecté à un dispositif (10) de commande et de régulation de la forme de l'onde voltaïque d'expulsion de la goutte de vernis de la buse en fonction de la viscosité et/ou de la composition du vernis à déposer, la mesure de la viscosité du vernis étant effectuée par une sonde (11) en amont de l'actionneur piézo-électrique et/ou de la résistance chauffante.A jet printing device for applying a lacquer coating to a surface of a substrate comprising at least: - an entrance shop, - an outlet store, - a computer management means operations on each of the workstations, a means for moving the substrate between the different workstations, a means for gripping and transferring the substrate from the input magazine to the moving means and from the moving means to the output magazine, a plurality of nozzles (12) housed in a module forming a print head, at least one of the nozzles being fed by a reservoir (7) containing spray coating on the substrate, each of the nozzles being vibrated by a piezoelectric actuator so that the excitation of the actuator in duration and power determines the size and shape of the varnish drop, a laying station for laying the product in a determined zone of the substrate, characterized in that the reservoir contains spray paint on the substrate, the piezoelectric actuator of at least one nozzle is connected to a device (10) for controlling and regulating the shape of the voltaic wave of expulsion of the varnish drop from the nozzle as a function of the viscosity and / or the composition of the varnish to be deposited, the measurement of the viscosity of the varnish being carried out by a probe (11) upstream of the piezoelectric actuator and / or heating resistor. Dispositif d'impression à jet pour la pose d'un vernis selon la revendication 1, caractérisé en ce que la forme de l'onde voltaïque d'expulsion comprend : - un signal (1) de tension correspondant à l'état d'une buse de vernis au repos, - un front montant (2) du voltage jusqu'à un plateau (3) formant la phase d'éjection, - une inversion de polarité (4) de la tension jusqu'à un plateau (5) de durée correspondant à la durée d'un rechargement de la buse en vernis, - un front descendant (6) qui assure le retour du signal voltaïque à son niveau de repos. A jet printing device for applying a varnish according to claim 1, characterized in that the form of the voltaic expulsion wave comprises: a signal (1) of voltage corresponding to the state of a varnish nozzle at rest, a rising edge (2) of the voltage up to a plateau (3) forming the ejection phase, a polarity inversion (4) of the voltage up to a plateau (5) of duration corresponding to the duration of a refilling of the varnished nozzle, - A falling edge (6) which ensures the return of the voltaic signal at its rest level. Dispositif d'impression à jet pour la pose d'un vernis selon la revendication 2, caractérisé en ce que la durée du plateau du rechargement de la buse en vernis est égale à celle du plateau correspondant à la phase d'éjection du vernis.A jet printing device for applying a varnish according to claim 2, characterized in that the duration of the plate of the reloading of the varnish nozzle is equal to that of the plate corresponding to the ejection phase of the varnish. Dispositif d'impression à jet pour la pose d'un vernis selon au moins une des revendications 2 ou 3, caractérisé en ce que le front montant comprend au moins un plateau positionné à une valeur intermédiaire entre la valeur du signal voltaïque de repos et la valeur du signal au niveau du plateau d'éjection, ce plateau avec une valeur intermédiaire correspondant à la préparation de l'éjection.A jet printing device for applying a varnish according to at least one of claims 2 or 3, characterized in that the rising edge comprises at least one plate positioned at an intermediate value between the value of the resting voltaic signal and the signal value at the ejection tray, this tray with an intermediate value corresponding to the preparation of the ejection. Dispositif d'impression à jet pour la pose d'un vernis selon au moins une des revendications 2 ou 3, caractérisé en ce que le front montant présente une progression croissante et continue.A jet printing device for applying a varnish according to at least one of claims 2 or 3, characterized in that the rising edge has an increasing and continuous progression. Dispositif d'impression à jet pour la pose d'un vernis selon au moins une des revendications 2 ou 3 ou 4 ou 5, caractérisé en ce que la valeur et/ou la durée d'au moins un plateau et/ou la forme de l'onde voltaïque est prédéfinie et mise en corrélation avec au moins un type de vernis identifié dans au moins un moyen de mémorisation connecté au dispositif de contrôle et de régulation de la forme de l'onde voltaïque d'expulsion de la goutte de vernis de la buse, permettant la sélection des informations correspondant au type de vernis.A jet printing device for applying a varnish according to at least one of claims 2 or 3 or 4 or 5, characterized in that the value and / or the duration of at least one tray and / or the form of the voltaic wave is predefined and correlated with at least one type of varnish identified in at least one storage means connected to the device for controlling and regulating the shape of the voltaic wave of expulsion of the varnish drop; the nozzle, allowing the selection of information corresponding to the type of varnish. Dispositif d'impression à jet pour la pose d'un vernis selon une des revendications précédentes, caractérisé en ce qu'au moins une buse du dispositif intègre une résistance (13) chauffante connectée à un dispositif de contrôle de la viscosité de la goutte de vernis dans la buse, le dispositif de contrôle (10) intégrant un moyen de commande et de régulation de la température de la goutte de vernis dans la buse.Jet printing device for applying a lacquer according to one of the preceding claims, characterized in that at least one nozzle of the device incorporates a heating resistor (13) connected to a device for controlling the viscosity of the drop of varnish in the nozzle, the control device (10) incorporating a means for controlling and regulating the temperature of the drop of varnish in the nozzle. Dispositif d'impression à jet pour la pose d'un vernis selon la revendication 7, caractérisé en ce que le dispositif de contrôle de la viscosité de la goutte est connecté à un moyen de mémoire intégrant au moins une base de donnée corrélant au moins une température prédéfinie de la résistance à une viscosité du vernis d'un type donné utilisé en sortie de buse en fonction de la composition du vernis à déposer.A jet printing device for applying a varnish according to claim 7, characterized in that the device for controlling the viscosity of the drop is connected to a memory means integrating at least one data base correlating at least one predefined temperature of the resistance to a viscosity of the varnish of a given type used at the outlet of the nozzle as a function of the composition of the varnish to be deposited. Dispositif d'impression à jet pour la pose d'un vernis selon au moins une des revendications précédentes, caractérisé en ce que le dispositif d'impression à jet est associé à un moyen de programmation du dispositif de commande et de régulation de la forme de l'onde voltaïque d'expulsion de la goutte et/ou du dispositif de contrôle de la viscosité de la goutte de vernis dans la buse.A jet printing device for applying a lacquer according to at least one of the preceding claims, characterized in that the jet printing device is associated with a programming means of the control and regulation device of the form of the voltaic wave of expulsion of the drop and / or the device for controlling the viscosity of the drop of varnish in the nozzle. Dispositif d'impression à jet pour la pose d'un vernis selon au moins une des revendications précédentes, caractérisé en ce que le dispositif d'impression comprend au moins une lampe à U.V. en aval du poste de dépôt du vernis qui présente une émission dans une longueur d'onde adaptée à l'activation d'au moins un photo-initiateur de la composition du vernis spécifique du support du substrat imprimé.A jet printing device for applying a lacquer according to at least one of the preceding claims, characterized in that the printing device comprises at least one UV lamp downstream of the lacquer deposit station which has an emission in a wavelength suitable for activating at least one photoinitiator of the composition of the specific varnish of the support of the printed substrate. Dispositif d'impression à jet pour la pose d'un vernis selon au moins une des revendications précédentes, caractérisé en ce que le dispositif d'impression comprend au moins une lampe à Infrarouge positionnée en face du substrat et arrangée en amont de la lampe U.V. pour pré-sécher le substrat, le positionnement étant défini selon une distance optimale en fonction du substrat sur lequel le vernis est déposé et/ou de la composition du vernis déposé.Jet printing device for applying a lacquer according to at least one of the preceding claims, characterized in that the printing device comprises at least one infrared lamp positioned in front of the substrate and arranged upstream of the UV lamp. to pre-dry the substrate, the positioning being defined according to an optimum distance in function of the substrate on which the varnish is deposited and / or the composition of the varnish deposited. Dispositif d'impression à jet pour la pose d'un vernis selon la revendication 11, caractérisé en ce qu'au moins une longueur d'onde de la lampe à Infrarouge est adaptée pour fournir un pré-séchage optimal en fonction du substrat sur lequel le vernis est déposé et/ou de la composition du vernis déposé.A jet printing device for applying a varnish according to claim 11, characterized in that at least one wavelength of the infrared lamp is adapted to provide an optimal pre-drying as a function of the substrate on which the varnish is deposited and / or the composition of the varnish deposited. Dispositif d'impression à jet pour la pose d'un vernis selon une des revendications 11 ou 12, caractérisé en ce que le dispositif d'impression comprenant au moins deux lampes Infrarouge émettant dans des intervalles de longueurs d'onde différentes, la puissance respective de chacune des lampes est commandée et contrôlée par un dispositif gérant une combinaison des rayonnement des lampes Infrarouge adaptée à l'obtention d'un pré-séchage du vernis optimisé en fonction du substrat sur lequel le vernis est déposé et/ou de la composition du vernis déposé.A jet printing device for applying a varnish according to one of claims 11 or 12, characterized in that the printing device comprising at least two infrared lamps emitting in different wavelength intervals, the respective power each of the lamps is controlled and controlled by a device managing a combination of the radiation of the infrared lamps adapted to obtain pre-drying of the optimized varnish according to the substrate on which the varnish is deposited and / or the composition of the varnish deposited. Dispositif d'impression à jet pour la pose d'un vernis selon une des revendications 11, 12 ou 13, caractérisé en ce que le dispositif comprend un moyen de déplacement du substrat en face et à une distance déterminée d'au moins une lampe à Infrarouge selon une vitesse contrôlée et adaptée au type de substrat sur lequel le vernis est déposé et/ou à la composition du vernis déposéJet printing device for applying a varnish according to one of claims 11, 12 or 13, characterized in that the device comprises means for moving the substrate opposite and at a determined distance from at least one lamp. Infrared according to a controlled speed and adapted to the type of substrate on which the varnish is deposited and / or to the composition of the deposited varnish Dispositif d'impression à jet pour la pose d'un vernis selon une des revendications précédentes, caractérisé en ce que le dispositif comprend un système de correction d'au moins une déviation latérale de l'impression par le dispositif.A jet printing device for applying a varnish according to one of the preceding claims, characterized in that the device comprises a system for correcting at least one lateral deviation of the printing by the device.
EP09290969.6A 2008-12-30 2009-12-18 Device for inkjet printing of a varnish composition for a printed substrate Active EP2204286B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
SI200931301T SI2204286T1 (en) 2008-12-30 2009-12-18 Device for inkjet printing of a varnish composition for a printed substrate
EP15172414.3A EP2982512A3 (en) 2008-12-30 2009-12-18 Device for inkjet printing of a varnish composition for a printed substrate
PL09290969T PL2204286T3 (en) 2008-12-30 2009-12-18 Device for inkjet printing of a varnish composition for a printed substrate

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0807500A FR2940627B1 (en) 2008-12-30 2008-12-30 INK JET PRINTING DEVICE OF A VARNISH COMPOSITION FOR A PRINTED SUBSTRATE.

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EP15172414.3A Division-Into EP2982512A3 (en) 2008-12-30 2009-12-18 Device for inkjet printing of a varnish composition for a printed substrate
EP15172414.3A Division EP2982512A3 (en) 2008-12-30 2009-12-18 Device for inkjet printing of a varnish composition for a printed substrate

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EP2204286B1 EP2204286B1 (en) 2015-08-26

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EP (2) EP2982512A3 (en)
DK (1) DK2204286T3 (en)
ES (1) ES2551152T3 (en)
FR (1) FR2940627B1 (en)
PL (1) PL2204286T3 (en)
SI (1) SI2204286T1 (en)

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Also Published As

Publication number Publication date
EP2204286B1 (en) 2015-08-26
FR2940627B1 (en) 2014-09-12
US20100165024A1 (en) 2010-07-01
EP2982512A2 (en) 2016-02-10
US20130307890A1 (en) 2013-11-21
FR2940627A1 (en) 2010-07-02
EP2982512A3 (en) 2016-03-30
US8506031B2 (en) 2013-08-13
US8783806B2 (en) 2014-07-22
SI2204286T1 (en) 2015-12-31
DK2204286T3 (en) 2015-12-07
PL2204286T3 (en) 2016-01-29
ES2551152T3 (en) 2015-11-16

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