WO2002020180A1 - Method and machine for applying a thick layer of varnish to facing sheets in roll form - Google Patents
Method and machine for applying a thick layer of varnish to facing sheets in roll form Download PDFInfo
- Publication number
- WO2002020180A1 WO2002020180A1 PCT/EP2001/009958 EP0109958W WO0220180A1 WO 2002020180 A1 WO2002020180 A1 WO 2002020180A1 EP 0109958 W EP0109958 W EP 0109958W WO 0220180 A1 WO0220180 A1 WO 0220180A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- varnish
- sheet
- lamina
- extrusion head
- machine according
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
- B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
- B05C5/0254—Coating heads with slot-shaped outlet
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/26—Processes for applying liquids or other fluent materials performed by applying the liquid or other fluent material from an outlet device in contact with, or almost in contact with, the surface
- B05D1/265—Extrusion coatings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2252/00—Sheets
- B05D2252/02—Sheets of indefinite length
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/06—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation
- B05D3/061—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation using U.V.
- B05D3/065—After-treatment
- B05D3/067—Curing or cross-linking the coating
Definitions
- the present invention relates to a method for applying to thin sheets used for the facing of panels a layer of varnishing or paint whose thickness allows subsequent sandpapering, in order to eliminate any imperfections and to achieve a higher degree of protection and a better finish.
- the invention also relates to a machine suitable to perform such method.
- Background art Current varnishing methods do not allow to apply to sheets of decorative paper, PVC, or other materials a layer of varnish whose thickness is such as to allow subsequent sandpapering of the manufactured article and its adequate protection. Varnish can in fact be applied by spray or curtain coating only to panels.
- a Mayer bar or a flexographic system or roller spreading are used for thin facing sheets.
- the Mayer bar constituted by a cylindrical element covered by a spiral, is capable of depositing only a thin layer of varnish, and if the spiral is not perfectly clean it can cause scoring on the treated surface.
- the flexographic system also only allows to deposit a thin layer of varnish.
- the aim of the present invention is to deposit, on the thin sheets of various widths that are commonly used for facing panels, a layer of varnish whose thickness is such as to allow its subsequent sandpapering, in order to eliminate any imperfections and achieve a higher degree of protection and a better finish.
- Another object is to allow the most appropriate choice of the grammage of the varnish applied and to keep it uniform and independent of the sheet advancement speed.
- a method for applying a thick layer of varnish to sheets used for facing in roll form comprising the steps of: depositing a lamina of varnish onto a sheet which unwinds from a roll; and cross-linking the lamina to dry the lamina of varnish.
- Figure 1 is a schematic view of the main elements of the machine.
- Figure 2 is a cross sectional view of the extrusion head, which deposits a layer of varnish on the sheet;
- Figure 3 is a front view of a part of the modular extrusion head.
- the reference numeral 1 designates a roll from which a sheet of paper 2 to be varnished unwinds
- the reference numeral 3 designates a reel for taking up the coated sheet.
- the reference numerals 4, 5 and 6 designate sheet advancement and guiding rollers.
- the numeral 7 designates a modular extrusion head, from a lower slit of which a uniform lamina of varnish 8 flows out and is spread onto the advancing sheet 2 at adjustable contrast bars 9.
- the varnish to be applied is sent to the extrusion head through one or more ducts 10 by means of a variable-speed gear pump 11 applied to a tank 12.
- the resin contained in the tank is mixed continuously by means of an agitator 13 in order to prevent settling of the photoactivating agent.
- the tank 12, the duct 10 and the extrusion head 7 are preferably thermostat-controlled in order to control the viscosity of the resin.
- the extrusion head is divided into multiple side-by-side modules, shown in Figures 3 and 4 which can be activated separately by means of cocks or solenoid-activated valves 14. Moreover, the extrusion head is applied to an adjustable head support, which allows to vary its distance and inclination with respect to the sheet. The mechanism for feeding the sheet to be varnished, contrasted by the brake of the unwinding unit, determines the correct tension of said sheet.
- the deposited layer of varnish is then dried by exposure to ultraviolet light emitted by one or more lamps 16 and reflected by mirrors 17 contained within a unit 18.
- the radiating unit is cooled by means of a delivery duct 19 and a return duct 20.
- a suction belt 15 which is designed to keep the sheet perfectly flat during the step of drying of the varnish.
- the speed of the gear pump, the rate of advancement of the sheet, the temperature of the tank, of the extrusion head and of the corresponding duct, the modules to be activated and any other parameters are controlled by means of a computer, so as to obtain a uniform layer of varnish having the chosen grammage.
- the described method and machine are used to initially distribute the primer or insulating agent onto the sheet in roll form and then to apply the varnish resin by means of the same machine or by means of multiple in-line machines.
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2002212178A AU2002212178A1 (en) | 2000-09-05 | 2001-08-29 | Method and machine for applying a thick layer of varnish to facing sheets in roll form |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITPS2000A000013 | 2000-09-05 | ||
IT2000PS000013A ITPS20000013A1 (en) | 2000-09-05 | 2000-09-05 | PROCEDURE AND MACHINE FOR THE APPLICATION OF A THICK LAYER OF PAINT ON BOBINR COATING SHEETS |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002020180A1 true WO2002020180A1 (en) | 2002-03-14 |
Family
ID=11453513
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2001/009958 WO2002020180A1 (en) | 2000-09-05 | 2001-08-29 | Method and machine for applying a thick layer of varnish to facing sheets in roll form |
Country Status (3)
Country | Link |
---|---|
AU (1) | AU2002212178A1 (en) |
IT (1) | ITPS20000013A1 (en) |
WO (1) | WO2002020180A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2149402A1 (en) * | 2008-07-15 | 2010-02-03 | düspohl Maschinenbau GmbH | Method of coating a substrate with radiation cured paint |
Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1266745A (en) * | 1969-06-11 | 1972-03-15 | ||
US4121535A (en) * | 1977-03-16 | 1978-10-24 | Inta-Rota, Incorporated | Hot melt pumping apparatus |
US4148274A (en) * | 1974-10-15 | 1979-04-10 | Agfa-Gevaert N.V. | Processing apparatus |
US4990364A (en) * | 1986-12-04 | 1991-02-05 | 501 Schmalbach Lubeca Ag | Solvent-free, low-monomer or monomer-free polymerizable hot melt coating process |
US5520958A (en) * | 1993-01-15 | 1996-05-28 | Nordson Corporation | System and method for applying a desired, protective finish to printed label stock |
DE19516058A1 (en) * | 1995-05-04 | 1996-11-07 | Wolfgang Anger | Laminating a film to a carrier using UV hardenable adhesive |
US5605720A (en) * | 1996-04-04 | 1997-02-25 | J & M Laboratories Inc. | Method of continuously formulating and applying a hot melt adhesive |
US5614023A (en) * | 1990-04-13 | 1997-03-25 | Fuji Photo Film Co., Ltd. | Apparatus for applying a thin film of magnetic liquid from an extrusion-type head to a flexible band-like web |
US5958137A (en) * | 1989-03-10 | 1999-09-28 | Nextec Applications, Inc. | Apparatus of feedback control for the placement of a polymer composition into a web |
JP2000061388A (en) * | 1998-08-21 | 2000-02-29 | Dainippon Printing Co Ltd | Coating method |
-
2000
- 2000-09-05 IT IT2000PS000013A patent/ITPS20000013A1/en unknown
-
2001
- 2001-08-29 AU AU2002212178A patent/AU2002212178A1/en not_active Abandoned
- 2001-08-29 WO PCT/EP2001/009958 patent/WO2002020180A1/en active Application Filing
Patent Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1266745A (en) * | 1969-06-11 | 1972-03-15 | ||
US4148274A (en) * | 1974-10-15 | 1979-04-10 | Agfa-Gevaert N.V. | Processing apparatus |
US4121535A (en) * | 1977-03-16 | 1978-10-24 | Inta-Rota, Incorporated | Hot melt pumping apparatus |
US4990364A (en) * | 1986-12-04 | 1991-02-05 | 501 Schmalbach Lubeca Ag | Solvent-free, low-monomer or monomer-free polymerizable hot melt coating process |
US5958137A (en) * | 1989-03-10 | 1999-09-28 | Nextec Applications, Inc. | Apparatus of feedback control for the placement of a polymer composition into a web |
US5614023A (en) * | 1990-04-13 | 1997-03-25 | Fuji Photo Film Co., Ltd. | Apparatus for applying a thin film of magnetic liquid from an extrusion-type head to a flexible band-like web |
US5520958A (en) * | 1993-01-15 | 1996-05-28 | Nordson Corporation | System and method for applying a desired, protective finish to printed label stock |
DE19516058A1 (en) * | 1995-05-04 | 1996-11-07 | Wolfgang Anger | Laminating a film to a carrier using UV hardenable adhesive |
US5605720A (en) * | 1996-04-04 | 1997-02-25 | J & M Laboratories Inc. | Method of continuously formulating and applying a hot melt adhesive |
JP2000061388A (en) * | 1998-08-21 | 2000-02-29 | Dainippon Printing Co Ltd | Coating method |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 05 14 September 2000 (2000-09-14) * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2149402A1 (en) * | 2008-07-15 | 2010-02-03 | düspohl Maschinenbau GmbH | Method of coating a substrate with radiation cured paint |
Also Published As
Publication number | Publication date |
---|---|
ITPS20000013A0 (en) | 2000-09-05 |
AU2002212178A1 (en) | 2002-03-22 |
ITPS20000013A1 (en) | 2002-03-05 |
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