EP1498229A2 - Method of cutting a web having at least an adhesive side laying on a protective substrate into individual finished elements - Google Patents

Abstract

A cross punching process defines a single stamping line to divide the material length across its full width, into individual punched parts. The line deviates from the straight, and the covering material of the length is not or only slightly cut. The cross punching is carried out at an angle of mainly 90[deg] to the direction of the material length. The line may be curved, wave-shaped, saw tooth-like and/or zig-zag-shaped. The length consists of a layer of adhesive or a base material with an adhesive coating on one or both sides. The covering material has an anti-adhesive coating on both sides, and the degree of deflection of the anti-adhesive coating is the same as that of the adhesive material.

Description

The invention relates to a method for punching of at least one side adhesive equipped sheet, which is located on a cover material, into individual diecuts.

Single-sided and double-sided adhesive tape diecuts are used in household, office and home versatile in industrial production.

Parts to be fastened by a double sided tape (for example Ribbon cables, displays, cardboard boxes) are very often completely self-adhesive in advance equipped. This is associated with a lot of material consumption, and both the Equal edging of parts with a tape, as well as the necessary Peeling off the tape cover later during assembly are very time consuming.

An alternative is to apply individual adhesive dots directly at the Assembly, and then gluing the part to it. This work is also cumbersome because the adhesive dots are again equipped with a cover, which must be removed in advance.

Certain parts (for example, electronic components or gaskets in Mobile phones) enforce the use of double-sided depending on the application adhesive stampings. These stamped parts are individual Adhesive tape sections, either directly one behind the other on a carrier web are arranged or with predetermined distance, regularly or may be irregular, located on the carrier web.

These stamped parts have to be used in advance in a dancing process, in particular in the above-mentioned kiss cut process, to be assembled into the required shape, taking precedence to the Production of stamped parts adhesive tape with an antiadhesive equipped material must be covered.

The kiss-cut process is characterized in that the punching antiadhesive equipped material not or only slightly injured or punched becomes. In this way it is avoided that after punching glue the stamped parts in the Slits flows and glued to the material. If this should happen in subsequent Production steps in which the material is further processed with the stamped parts should be, split the material. So that would be the whole role of finishing excluded and thus waste.

The preparation is, for example, also found on a cover paper Web made of a single adhesive layer or of a carrier material may exist, which is equipped at least on one side with an adhesive in individual Punching is punched, the backing is just not punched through.

The cross cuts of such webs are doing with straight transverse cutting lines performs. The transverse cutting edge is also exactly 90 ° in relation to arranged the machine direction. This is shown in Figure 1. The web will be in Machine direction (see arrow) divided into individual punched 50, where the line of Cross punch 60 at an angle of 90 ° to the web or Machine direction is aligned.

A variant of the method is that the web without crossbars, that is without Intermediate spaces between the diecuts, is punched.

In the f igur 2 s and the double-sided calf slabs o hne Q uersteg (gap) shown. On a carrier sheet 20 there are two adhesive layers 10, 11. The web Carrier film 20 and adhesive layers 10, 11 is located on a backing paper 30. Nach the punching process (the arrow indicates the machine direction) are between the individual diecuts 1, 2, 3 no crossbars present, the diecuts 1, 2, 3 touch yourself.

Another variant of the method is that the web with transverse webs, that is with gaps between the diecuts, is punched. The resulting distance between the diecuts depends on Cross cutting distance in the punching tool.

FIG. 3 shows double-sided adhesive tape diecuts with a transverse web (intermediate space) 40 shown. On a carrier sheet 20 there are two adhesive layers 10, 11. The web Carrier film 20 and adhesive layers 10, 11 is located on a backing paper 30. Nach the punching process (the arrow indicates the machine direction) are between the individual diecuts 1, 2, 3 transverse webs 40 available. The material between the Diecuts 1, 2, 3 are removed.

DE 101 07 294 A1, for example, discloses a covering material web on which Adhesive tape sections equipped with adhesive strips on both sides are arranged with transverse webs are, wherein on the Abdeckmaterialbahn both sides an anti-adhesive coating is applied and wherein the two anti-adhesive coatings in Distinguishing degree of repellency to the adhesive of the adhesive tape sections. Particularly advantageous is the Abdeckmaterialbahn for bonding of individual Use parts in the automotive industry, but also for example at the fair construction or in the Area packaging.

With the transverse punching of the material in predetermined and defined by the punch Length sections eliminates a separate and otherwise usual cut off the adhesive tape in the individual pieces of tape with scissors or with a knife.

From DE 196 41 094 C1 is a method for lossless punching of adhesive Stanzlingen from an endless track known, the train at least one-sided with Covered a release laminate.

In the first process step, the web is guided in a punching device, wherein in the Cutting line of the punching device The individual contours of the punched parts without punched grid be punched in the train. The cutting line is branched in this method. In the second process step, immediately after the punching process, the release laminate deducted by means of a dispensing edge with a small deflection radius. In the third step, then the individual diecuts are on second release laminate applied, wherein the second release laminate has a higher Web speed than the first release laminate, whereby a separation the diecuts on the second release laminate takes place.

The web speed of the second release laminate according to the invention is always so choose it to be larger than the first release laminate. The differential speed between the first release laminate and the second Release laminate simultaneously determines the distance at which the individual diecuts on be stored the second release laminate. The higher the differential speed, the larger the distances.

Other applications of such double-sided adhesive stampings are in Automotive sector. For example, the bonding of flat cables in the car headliners emphasized.

Film cable systems, in contrast to conventional cable harnesses, are thin, weightless and space-saving, very flexible and poorly manageable, so that the assembly the same on a passenger car interior part manually very expensive and time consuming.

So far, these are fixed by double-sided in a first production step Adhesive tapes with release paper on one side on FFC cable systems at the harness manufacturer be applied. In a staggered second step, usually at the automaker at the Assembly line, the FFC cable set is applied to the decorative part in such a way that manually the release paper must be removed before the cable system on the End position of the headliner is positioned.

This process is very time consuming and also has the disadvantage that he the The desire of many automotive component manufacturers for more automation does not follow. Manual labor is still required with the risks of fluctuating Quality levels.

A use for cross-cut double-sided adhesive tape diecuts is the permanent Fixation of flat cables on car roof linings, where a defined number of individual adhesive tape diecuts are applied to the substrate. For easier application of the double-sided adhesive tape diecuts, there are Adhesive tape dispensers during the gluing of the double-sided adhesive diecut remove the non-stamped masking paper and with the help of a retractor Wind up the cover paper strip.

The object of the invention is to provide a method available in the diecuts are made particularly well by means of appropriate dispenser are pledging.

This object is achieved by a method as set out in the main claim. Further developments of the method according to the invention are the subject of the dependent claims.

Accordingly, the invention consists in a method of punching at least one one-sided adhesive-coated web, which is located on a cover material, in single die cuts, whereby the punching line of the transverse punching, which the course over the full width of the web in a non-branching line in the diecuts divided, having a deviating from a straight line shape. The cover material is not punched or negligible.

In a first preferred embodiment, the transverse punching has an angle of essentially at 90 ° to the web direction.

Further preferably, the punching line is arcuate, wavy, sawtooth and / or zig-zag.

Furthermore, any combinations of said embodiments are possible.

The Abdeckmaterialbahn is to a role in the form of an Archimedean spiral wound. On the Abdeckmaterialbahn the individual diecuts are arranged.

Further preferably, an anti-adhesive is on both sides of the masking material Applied coating, wherein the two anti-adhesive coatings in Degree of repellency to the adhesive do not differ.

It is known that the anti-adhesive coating located on the upper side of the Covering material has a lower degree of repellency than that anti-adhesive coating located on the lower side of the cover material. With the method according to the invention, it is for the first time possible to use a covering material on both sides identical repellencies to the adhesive for such diecuts to use.

• die einzelnen Klebebandabschnitte auf der Abdeckmaterialbahn in Form einer Rolle ohne weitere Hilfsmittel (zum Beispiel einer zweiten Abdeckung) konfektioniert und dargereicht werden können und
• die Klebebandabschnitte durch einen Abroller einfach gespendet werden können. Erfindungsgemäß können des weiteren als Abdeckmaterial hochverdichtete Glassine-Papiere, eingesetzt werden, die auf der oberen und/oder auf der unteren Seite mit einer Kunststoffbeschichtung versehen sind, wobei auf beiden der gegebenenfalls vorhandenen zwei Kunststoffbeschichtungen antiadhäsive Schichten aufgetragen sind, insbesondere Silikonbeschichtungen.In einer weiteren Ausführungsform der Erfindung wird ein Papierträger mit einer Dichte von 1,1 bis 1,25 g/cm³ als Abdeckmaterial eingesetzt, wobei der Papierträger im wesentlichen eine obere und eine untere Seite aufweist. Der Papierträger ist auf der oberen und/oder auf der unteren Seite mit einer Kunststoffbeschichtung versehen, wobei auf beiden der gegebenenfalls vorhandenen zwei Kunststoffbeschichtungen antiadhäsive Schichten aufgetragen sind, insbesondere Silikonbeschichtungen.Vorzugsweise weist der Papierträger beziehungsweise das Glassine-Papier eine Dichte auf von 1,12 bis 1,2 g/cm³, insbesondere 1,14 bis 1,16g/cm³. Weiter vorzugsweise weist der Papierträger beziehungsweise das Glassine-Papier ein Flächengewicht von 40 bis 120 g/m², bevorzugt 50 bis 110 g/m², ganz besonders bevorzugt 60 bis 100 g/m², auf.Als Kunststoffbeschichtung werden insbesondere Polyolefine wie LDPE, HDPE, Mischungen der beiden zuvor genannten, zum Beispiel MDPE, PP oder PTE verwendet. Ganz besonders vorteilhaft ist LDPE.Die polybeschichteten Seiten des Papierträgers aus LDPE oder HDPE sind darüber hinaus matt oder glänzend herstellbar.Weiter vorzugsweise wird die Kunststoffbeschichtung mit 5 bis 30 g/m², bevorzugt 10 bis 25 g/m², ganz besonders bevorzugt 15 bis 20 g/m², aufgetragen. Insbesondere bei Polyester kann der Auftrag auch bereits bei 2 bis 3 g/m² erfolgen.Darüber hinaus stellt eine hervorragende Ausbildung der Erfindung die Tatsache dar, wenn als antiadhäsive Schichten zum Beispiel Silikon, Paraffin, Teflon oder Wachse verwendet werden. Dann können silikonfreie Trennschichten, zum Beispiel "non Silicone" von der Firma Rexam, oder silikonarme Trennschichten, zum Beispiel "Lo ex" von der Firma Rexam, eingesetzt werden.Als antiadhäsive Beschichtung wird vorzugsweise ein lösemittelfrei beschichtetes Silikon eingesetzt. Weiter vorzugsweise wird die antiadhäsive Beschichtung und/oder das lösemittelfrei beschichtete Silikon mit 0,8 bis 3 ,7 g /m², bevorzugt 1,3 bis 3,2 g/m², ganz besonders bevorzugt 1,8 bis 2,8 g/m², aufgetragen. Aber auch lösemittelhaltige Systeme als antiadhäsive Beschichtung sind möglich, und zwar mit einer Auftragsmenge von insbesondere 0,3 bis 1 g/m².Auf diese Weise ist gewährleistet, dass das Abdeckmaterial bei beidseitiger Polybeschichtung
• dimensionsstabile Eigenschaften (gute Planlage)
• eine geringe Dicke mit hoher Dickenkonstanz (enge Toleranzen, präzisere Stanzschnitte)
• und eine Schutzschicht gegen Anstanzungen des Papierkörpers
• eine geringe Dicke mit hoher Dickenkonstanz (enge Toleranzen, präzisere Stanzschnitte) und
• eine Schutzschicht gegen Anstanzungen des Papierkörpers aufweist. Die Bahn besteht vorzugsweise aus einer Klebemasseschicht oder aus einem Trägermaterial, das ein-oder beidseitig mit einer Klebemasse ausgerüstet ist.Als Trägermaterial werden vorzugsweise Papier, ein Papier-Polyolefin-Verbund und/oder eine Folie eingesetzt. Als Trägermaterial sind weiterhin prinzipiell Folien wie zum Beispiel BOPP oder MOPP, PET, PVC oder Vliese (auf Basis Cellulose oder Polymere) geeignet. Weiterhin kommen auch Schäume (zum Beispiel PUR, PE, PE/EVA, EPDM, PP, PE, Silikon, usw.) oder Trennpapiere (Kraft Papiere, polyolefinisch beschichtete Papiere) oder Trennfolien (PET, PP oder PE oder Kombinationen aus diesen Materialien) als Beschichtungssubstrate in Frage.Als Klebemassen können alle Haftklebemassen, wie sie zum Beispiel im SATAS, Handbook of Pressure Sensitive Adhesive Technology, Third Edition, erwähnt sind, eingesetzt werden. Insbesondere eignen sich Natur-/Synthesekautschuk- und acrylatbasierende Klebemassen, die aus der Schmelze oder Lösung aufgetragen werden können. Während der Herstellung, der Weiterverarbeitung oder der späteren Beanspruchung von Polymeren beziehungsweise von Polymermassen kann es zur Ausbildung hoher Orientierungsgrade der Makromoleküle in bevorzugte Richtungen im gesamten Polymerverband kommen; durch diese Orientierung, die auch gezielt herbeigeführt werden kann, lassen sich die Eigenschaften der entsprechenden Polymere steuern und in Hinblick auf gewünschte Verwendungen verbessern. Anisotrop orientierte Haftklebemassen besitzen die Tendenz, sich nach einer Streckung in eine vorgegebene Richtung durch das "entropieelastische Verhalten" in den Ausgangszustand zurückzubewegen. Für die Verwendung in den Stanzlingen sind prinzipiell alle Haftklebemassen geeignet, die eine Orientierung aufweisen, beispielsweise solche auf Basis von Natur- und Synthesekautschuken wie Butylkautschuk, Neopren, Butadien-Acrylnitril, Styrol-Butadien-Styrol- und Styrol-Isopren-Styrol-Copolymerisaten, ferner auf Basis von linearen Polyestern und Copolyestren, Polyurethanen, Polysiloxanelastomeren, auf Basis von Reinacrylaten, ganz besonders aber anisotrope Haftklebemassen auf Polyacrylatbasis. Solche anisotrop orientierten Acrylathaftklebemasssen zeigen als Schicht nach Stanzund/oder Schneidvorgängen eine Rückstellung der Haftklebeschicht an der Schneid- und Stanzkante, welche für das Ausstanzen nicht wieder zusammenfließender Stanzformen genutzt wird.Eine vorteilhafte Weiterentwicklung verwendet eine Haftklebemasse,
• welche durch eine radikalische Polymerisation erhältlich ist,
• welche zu mindestens 65 Gew.-% auf zumindest einem acrylischen Monomer aus der Gruppe der Verbindungen der folgenden allgemeinen Formel basiert:
  
  

wobei R₁ = H oder CH₃ ist und der Rest R₂ = H oder CH₃ ist oder gewählt wird aus der Gruppe der verzweigten oder unverzweigten, gesättigten Alkylgruppen mit 2 bis 20, bevorzugt mit 4 bis 9 Kohlenstoffatomen, bei welcher das mittlere Molekulargewicht der Haftklebemasse mindestens 650.000 beträgt, und welche, sofern sie auf einen Träger aufgetragen ist, eine Vorzugsrichtung besitzt, wobei der in Vorzugsrichtung gemessene Brechungsindex n_MD größer ist als der in einer Richtung senkrecht zur Vorzugsrichtung gemessene Brechungsindex n_CD, und wobei die Differenz Δn = n_MD - n_CD mindestens 1×10^-5 beträgt.The adhesive tape sections lie with unrolled cover material on the top of the same. In this way, it is guaranteed that

• the individual adhesive tape sections on the cover material web in the form of a roll without further aids (for example, a second cover) can be assembled and presented and
• The tape sections can be dispensed by a dispenser easily. According to the invention, high-density glassine papers, which are provided with a plastic coating on the upper and / or lower side, can also be used, antiadhesive layers, in particular silicone coatings, being applied to both of the optionally present two plastic coatings Embodiment of the invention, a paper support having a density of 1.1 to 1.25 g / cm ^{3 is used} as cover material, wherein the paper support has substantially an upper and a lower side. The paper support is provided on the upper and / or on the lower side with a plastic coating, on both of which optionally two plastic coatings anti-adhesive layers are applied, in particular silicone coatings. Preferably, the paper support or the glassine paper has a density of 1.12 to 1.2 g / cm ³ , in particular 1.14 to 1.16 g / cm ³ . Further preferably, the paper support or the glassine paper has a basis weight of 40 to 120 g / m ² , preferably 50 to 110 g / m ² , most preferably 60 to 100 g / m ² auf.Als plastic coating are in particular polyolefins such as LDPE , HDPE, mixtures of the two previously mentioned, for example MDPE, PP or PTE used. The polycoated sides of the paper carrier made of LDPE or HDPE are moreover matt or glossy to produce. Further preferably, the plastic coating is at 5 to 30 g / m ² , preferably 10 to 25 g / m ² , very particularly preferably 15 to 20 g / m ² , applied. In the case of polyesters in particular, the application can also take place at from 2 to 3 g / m ^2. Moreover, an outstanding embodiment of the invention represents the fact that, for example, silicone, paraffin, Teflon or waxes are used as anti-adhesive layers. Then silicone-free release layers, for example, "non silicone" from Rexam, or low-silicone release layers, for example "Lo ex" from Rexam, can be used. As an anti-adhesive coating, a solvent-free coated silicone is preferably used. More preferably, the anti-adhesive coating and / or the solvent-free coated silicone with 0.8 to 3.7 g / m ² , preferably 1.3 to 3.2 g / m ² , most preferably 1.8 to 2.8 g / m ² , applied. But also solvent-based systems as anti-adhesive coating are possible, with an application amount of in particular 0.3 to 1 g / m ^{2. In} this way it is ensured that the cover material with double-sided polycoating
• Dimensionally stable properties (good flatness)
• a small thickness with high thickness constancy (narrow tolerances, more precise die cuts)
• and a protective layer against punctures of the paper body
• a small thickness with high thickness constancy (narrow tolerances, more precise die cuts) and
• has a protective layer against punching the paper body. The web preferably consists of an adhesive layer or of a carrier material which is equipped on one or both sides with an adhesive. The carrier material used is preferably paper, a paper-polyolefin composite and / or a film. In principle, films such as, for example, BOPP or MOPP, PET, PVC or nonwovens (based on cellulose or polymers) are also suitable as carrier material. Also come foams (for example PUR, PE, PE / EVA, EPDM, PP, PE, silicone, etc.) or release papers (Kraft papers, polyolefinically coated papers) or release films (PET, PP or PE or combinations of these materials) As PSAs, all PSAs, as they are mentioned, for example, in the SATAS, Handbook of Pressure Sensitive Adhesive Technology, Third Edition, can be used. In particular, natural / synthetic rubber and acrylate-based adhesives which can be applied from the melt or solution are suitable. During the production, the further processing or the later loading of polymers or of polymer masses, it is possible for the formation of high degrees of orientation of the macromolecules to occur in preferred directions in the entire polymer dressing; This orientation, which can also be brought about in a targeted manner, allows the properties of the corresponding polymers to be controlled and improved with regard to desired uses. Anisotropically oriented pressure-sensitive adhesives have the tendency to return to their original state after being stretched in a given direction due to the "entropy-elastic behavior". In principle, all PSAs which have an orientation, for example those based on natural and synthetic rubbers, such as butyl rubber, neoprene, butadiene-acrylonitrile, styrene-butadiene-styrene and styrene-isoprene-styrene copolymers, are suitable for use in the diecuts. furthermore based on linear polyesters and copolyesters, polyurethanes, polysiloxane elastomers, based on pure acrylates, but especially anisotropic polyacrylate-based pressure-sensitive adhesives. Such anisotropically oriented acrylate PSAs exhibit, as a layer after punching and / or cutting operations, resetting of the PSA layer at the cutting and punching edge, which is used for punching non-recombining dies. An advantageous further development uses a pressure-sensitive adhesive,
• which is obtainable by a free-radical polymerization,
• which is based on at least 65% by weight of at least one acrylic monomer selected from the group of compounds of the following general formula:
  
  

wherein R ₁ = H or CH ₃ and the radical R ₂ = H or CH ₃ or is selected from the group of branched or unbranched, saturated alkyl groups having 2 to 20, preferably having 4 to 9 carbon atoms, in which the average molecular weight the pressure-sensitive adhesive is at least 650,000, and which, when applied to a support, has a preferred direction, wherein the refractive index n _MD measured in the preferred direction is greater than the refractive index n _CD measured in a direction perpendicular to the preferred direction, and wherein the difference Δn = n _MD - n _{CD is} at least 1 × 10 ^-5 .

As non-exclusive examples of alkyl group which may preferably be used for the radical R ₂ , mention may hereinafter be made of butyl, pentyl, hexyl, heptyl, octyl, isooctyl, 2-methylheptyl, 2-ethylhexyl -, nonyl, decyl, dodecyl, lauryl, or stearyl (meth) acrylate or (meth) acrylic acid.

Vinylester, Vinylhalogenide, Vinylidenhalogenide, Nitrile ethylenisch ungesättigter Kohlenwasserstoffe.

Furthermore, the stamping process is excellent when using a pressure-sensitive adhesive which is up to 35 wt .-% based on comonomers in the form of vinyl compounds, in particular one or more vinyl compounds selected from the following group:

Vinyl esters, vinyl halides, vinylidene halides, nitriles of ethylenically unsaturated hydrocarbons.

For the purposes of use also fall acrylic compounds with functional groups the term "vinyl compound". Containing such functional groups Vinyl compounds are maleic anhydride, styrene, styrene compounds, vinyl acetate, (Meth) acrylamides, N-substituted (meth) acrylamides, β-acryloyloxypropionic acid, Vinylacetic acid, fumaric acid, crotonic acid, aconitic acid, dimethylacrylic acid, Trichloroacrylic acid, itaconic acid, vinyl acetate, hydroxyalkyl (meth) acrylate, amino group-containing (meth) acrylates, hydroxyl-containing (meth) acrylates, especially preferably 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, and / or 4-hydroxybutyl (meth) acrylate and double bond functionalized photoinitiators; the The list above is only an example and not exhaustive.

For the pressure-sensitive adhesives, it is particularly advantageous if the composition of the corresponding monomers is selected such that the resulting adhesives according to D. Satas [Handbook of Pressure Sensitive Adhesive Technology, 1989, VAN NOSTRAND REINHOLD, New York] have pressure-sensitive adhesive properties. For this purpose, the glass transition temperature of the acrylic PSA should, for example below 25 ° C.

• Polymerisation eines Gemisches enthaltend zumindest ein Monomer auf Vinyl-, Acryloder Methacrylbasis oder eine Kombination dieser Monomere, wobei das mittlere Molekulargewicht der entstehenden Polymere oberhalb von 650.000 liegt,
• anschließender Extrusionsbeschichtung der Polymermasse,
• anschließender Vernetzung der Polymermasse auf dem Träger durch Bestrahlung mit Elektronenstrahlen.

The PSAs used for the use, in particular the polyacrylate PSAs claimed above as being advantageous, are preferably prepared by a free-radical-initiated polymerization. A very suitable method is characterized by the following steps:

• Polymerization of a mixture containing at least one monomer based on vinyl, acrylo or methacrylic or a combination of these monomers, wherein the average molecular weight of the resulting polymers is above 650,000,
• subsequent extrusion coating of the polymer composition,
• subsequent crosslinking of the polymer composition on the support by irradiation with electron beams.

T-Düse, Fischschwanz-Düse und Bügel-Düse. Die einzelnen Typen unterscheiden sich durch die Gestalt ihres Fließkanals. Zur Herstellung von orientierten Acrylathaftklebemassen wird besonders bevorzugt mit einer Bügeldüse auf einen Träger beschichtet, und zwar derart, dass durch eine Relativbewegung von Düse zu Träger eine Polymerschicht auf dem Träger entsteht.

Die Zeitdauer zwischen der Beschichtung und der Vernetzung ist in günstiger Weise sehr gering, bevorzugt nicht größer als 10 s.

Durch die Ausformung des Acrylathotmelts in der Bügel-Düse sowie den Austritt aus der Düse mit einer bestimmten Filmdicke, durch die Reckung des Haftklebemassenfilms beim Übertrag auf das Trägermaterial auf eine dünnere Filmdicke und durch die anschließende Inline-Vernetzung wird die Orientierung erhalten.

The extrusion coating is preferably carried out by an extrusion die. The extrusion dies used can come from one of the following three categories:

T-nozzle, fishtail nozzle and stirrup nozzle. The individual types differ in the shape of their flow channel. For the production of oriented acrylic PSAs it is particularly preferred to coat a carrier with a stirrup nozzle in such a way that a polymer layer is formed on the carrier by a relative movement from nozzle to carrier.

The time between the coating and the crosslinking is favorably very low, preferably not greater than 10 s.

The orientation of the acrylate hot melt in the stirrup nozzle as well as the exit from the nozzle with a certain film thickness, the stretching of the PSA film on transfer to the carrier material to a thinner film thickness and the subsequent inline crosslinking.

The free radical polymerization can be carried out in the presence of an organic solvent or in the presence of water or in mixtures of organic solvents and water or in substance. Preference is given to so little solvent used as possible. The polymerization time is - depending on sales and Temperature - between 6 and 48 h.

In the solvent polymerization, esters are preferably more saturated as solvents Carboxylic acids (such as ethyl acetate), aliphatic hydrocarbons (such as n-hexane or n-heptane), ketones (such as acetone or methyl ethyl ketone), petroleum spirit or mixtures this solvent is used. For the polymerization in aqueous media or mixtures of organic and aqueous solvents are used for Polymerization of the person skilled in the art for this purpose known emulsifiers and Added stabilizers. As polymerization initiators are conventional radical-forming Compounds such as peroxides, azo compounds and peroxosulphates used. Initiator mixtures can also be used. In the polymerization can further regulate the molecular weight reduction and reduce the Polydispersity can be used. As so-called polymerization for example, alcohols and ethers are used. The molecular weight of Acrylate PSAs are advantageously between 650,000 and 2,000,000 g / mol, more preferably between 700,000 and 1,000,000 g / mol.

In a further procedure, the polymerization is carried out in polymerization, which are generally provided with a stirrer, several feed vessels, reflux condenser, heating and cooling and are equipped for working under N ₂ atmosphere and pressure.

After polymerization in solvent, the polymerization medium under reduced Pressure removed, this process at elevated temperatures, for example in the range of 80 to 150 ° C is performed. The polymers can then in a solvent-free state, in particular as a hotmelt PSA. In In some cases, it is also advantageous, the polymers of the invention in substance manufacture.

To prepare the acrylic PSAs, the polymers can be modified in the usual way. For example, tackifying resins such as terpene, terpene phenol, C ₅ , C ₉ , C ₅ / C ₉ hydrocarbon, pinene, indene or rosin resins can also be added in combination. It is also possible to use plasticizers, various fillers (for example fibers, carbon black, zinc oxide, titanium dioxide, micro-solid beads, solid or hollow glass beads, silica, silicates, chalk, blocking-free isocyanates, etc.), anti-aging agents, light stabilizers, antiozonants, fatty acids, plasticizers, nucleating agents, blowing agents and / or accelerators are used as additives. In addition, crosslinkers and promoters can be mixed for crosslinking. Suitable crosslinkers for electron beam crosslinking are, for example, difunctional or polyfunctional acrylates, polyfunctional multifunctional isocyanates or difunctional or polyfunctional epoxides.

The pure or blended acrylate hotmelts are passed through a variable nozzle Slit width on the support material b is coated with and subsequently on the support Hardened electron beams. The networking takes place immediately after inline operation applying the PSA to the carrier.

• einem Griffstück, das an einer Halteplatte angebracht ist,
• einer auf der Halteplatte drehbar gelagerten Aufnahme für die Rolle Abdeckmaterialbahn,
• einer auf der Halteplatte drehbar gelagerten Andruckrolle, die während des Spendevorganges die Abdeckmaterialbahn mit den Stanzlingen mit den Untergrund in Kontakt bringt und über die die Abdeckmaterialbahn mit den Stanzlingen von der Aufnahme für die Rolle derart geführt wird, dass die Stanzlinge während des Spendevorganges von der Abdeckmaterialbahn auf den Untergrund verspendet werden,
• einer auf der Halteplatte drehbar gelagerten Antriebsrolle, über die die Abdeckmaterialbahn mit den Stanzlingen derart geführt wird, dass die Antriebsrolle synchron zur Geschwindigkeit der Abdeckmaterialbahn rotiert,
• einer auf der Halteplatte drehbar gelagerten Aufnahmerolle, die die Abdeckmaterialbahn nach dem Verspenden der Stanzlinge aufnimmt und die insbesondere über einen Riemen durch die Bewegung der Antriebsrolle in Rotation versetzt wird.

Particularly advantageous is the bonding of both sides adhesive-coated diecuts, which have been stamped by the process according to the invention, by means of a device for unwinding of a roll located on a cover material with the double-sided punched punched out

• a handle which is attached to a holding plate,
• a rotatably mounted on the holding plate receptacle for the roll cover material web,
• a rotatably mounted on the support plate pinch roller, which brings the Abdeckmaterialbahn with the diecuts with the substrate during the dispensing process and over which the Abdeckmaterialbahn with the punched from the recording for the role is performed such that the punched during the dispensing of the Abdeckmaterialbahn be sent to the underground,
• a drive roller rotatably mounted on the holding plate, over which the covering material web is guided with the punched pieces such that the drive roller rotates synchronously with the speed of the Abdeckmaterialbahn,
• a receiving roller rotatably mounted on the holding plate, which receives the Abdeckmaterialbahn after dispensing the punched and which is set in particular via a belt by the movement of the drive roller in rotation.

In a further preferred embodiment, the drive roller between the Pick-up for the roll cover material web and the pressure roller arranged.

In a further preferred embodiment, a guide roller between the Pick up for the roll cover material web and the drive roller arranged to a very high angle of wrap of Abdeckmaterialbahn to the drive roller manufacture. In this way, a secure transmission of the movement of the Abdeckmaterialbahn on the drive roller and thus on the preferred belt on the pickup roller guaranteed.

Further preferably located on a fixable on the handle axis a adjustable positioning aid, in particular in the form of a festschraubbaren, rotatable shaft, over which the Abdeckmaterialbahn of the recording for the role Abdeckmaterialbahn is guided in the direction of the drive roller.

This positioning aid, in particular consisting of a movable in a groove to leading shaft, which is bolted inside the groove at any position is used, depending on the application of the diecuts to ensure that the beginning and / or end of the particular double-sided self-adhesive diecuts always at the specified position, so that the bond is always defined at the beginning 15 mm long section begins and after the dispensing process, So if, for example, the device once over a section of a Ribbon cable has been pulled, at the end of another, for example, 15 mm long section stops.

Another exemplary solution for such a positioning aid can be an additional be small positionable magnifying glass with marking in the same way.

The distance pinch roller and positioning aid is individually adjustable, adapted to the Length of double-sided self-adhesive diecuts. The user of the device always succeeds through this positioning aid to stay within the repeat given by the length of the diecuts.

To allow both left-handed and right-handed users to easily use the device allow the handle and all other components mirrored on the retaining plate are mounted.

In the recording for the role Abdeckmaterialbahn is another preferred Variant an adjustable brake, in particular friction brake available. This ensures a uniform, not too low tension in the Covering material during the dispensing process.

In a further preferred embodiment, the pressure roller is on one side fixed on the retaining plate and carries on the other side a counter plate. The Counter plate and the holding plate are in the device, which during the The dispensing operation is carried out extended in the direction of the handle. The counter plate and the holding plate are in shape with the pinch roller and the Lever arm of the handle matched so that at the end of the dispensing process Entire device from the user to the resulting from this geometry Fulcrum can be easily tilted. Through this rotation succeeds in Connection with the positioning aid always, on the one hand the last diecut still safe to donate, that is to transfer from the Abdeckmaterialbahn on the ground, On the other hand, the following, later to be bonded Stanzling still safe on the Cover material web held.

Suitable materials for the components are plastics, but also a metal version is possible.

The combination of the device and the cover material web offers a variety of advantages that could not have been foreseen in this way. There is no loss of time when dispensing the diecuts by subtracting a Cover and less garbage. Different sizes of the diecuts - in glued to different numbers - let virtually a "dosage" of the required amount Adhesive tape too.

Preferably, self-adhesive diecuts are used on both sides, which on the Abdeckmaterialbahn are arranged without a gap, so for example a 15 mm wide double-sided self-adhesive web, which has a transverse separation every 15 mm. An adhesive line of, for example, 90 mm is thus by a number of 6 Stanzlingen replaced to 15 mm. Other arbitrary dimensions are also conceivable. The diecuts of 15 mm in length can also be a rigid on both sides self-adhesive web with intermediate support with the aid of the device in curves be glued.

With reference to the figures described below are particularly advantageous Embodiments of the invention explained in more detail without this unnecessary want to restrict.

Show it

FIG. 1

a punching operation according to the prior art, which the Cross cut exactly 90 ° with respect to the machine direction is arranged

FIG. 2

double-sided adhesive tape diecuts with crosspiece (gap), as known in the art,

FIG. 3

double-sided adhesive tape die-cuts without crosspiece (Gap) as known in the art are,

FIG. 4

the comparison of a transverse punching according to the state of Technique with a transverse punching according to the invention, namely in Waveform

FIG. 5

the occurring force relationships in the transverse punches according to FIG. 4,

FIG. 6

different embodiments of the transverse punching,

FIG. 7

the device by means of which with the inventive Method can be dispensed punched,

FIG. 8

the design of the rotary punching cylinder.

In the figure 4 is the comparison of a transverse punch 60 according to the prior art shown with a transverse punch 60 according to the invention, in waveform. Of the Arrow indicates the machine direction. The transverse punch 60 of the 15 mm wide web is made every 15 mm. After this known punching results in punched 42 with a length of 15 mm. According to the method of the invention, the diecuts are also 15 mm long, but have wavy transverse edges.

FIG. 5 shows the occurring force relationships in the transverse punches according to FIG Figure 4, in each case the punching force of a rotary die, once with straight cutting edge, once with wavy cutting edge. By a deviating from the line punched line shape of the punching line pressure of Tool at the time of full engagement of the punch cutting in the punched reduced and distributed over a greater distance, which at the same time a larger Time duration corresponds. The rotary punching tool and the rotary punching machine become smaller Stamped line pressure less loaded in terms of power and load distribution. The force peaks occurring in rectilinear transverse punching cutters are-like The diagrams of Figure 5 can be seen - in odd-numbered Stamping line geometries not available.

FIG. 6 shows various embodiments of inventively designed Punch lines.

They are essentially odd, so for example bent. You can also be wavy, sawtooth and / or zig-zag-shaped configured. Furthermore regularly shaped punched lines are preferred (examples a3, b2, c1). But with irregularly shaped (see in particular example c2) is the method feasible.

In FIG. 6, the device for unrolling is located on a roller 4 Covering material web with punched articles 42, which are especially adhesive on both sides shown. The device is composed of several individual components. The central component is the holding plate 2, which serves to accommodate all other components, so a handle 1 which is screwed to the support plate 2. By simply moving the handle 1 is a pulling and also in particular allows a sliding movement of the device during the dispensing process, Preferably, the device is pushed because a higher contact force, the pressure-sensitive self-adhesive is advantageous, ergonomic with sliding Movement is much easier to apply.

On the holding plate 2 is then a rotatably mounted receptacle 21 for the roller 4th Covering material provided.

Furthermore, a rotatably mounted on the support plate 2 pinch roller 22 is present, the during the dispensing process the Abdeckmaterialbahn with the punched 42 with the Substrate brings into contact and 21 is performed for the role 4 such that the Punches 42 during the dispensing of the Abdeckmaterialbahn on the Substrate be dispelled. The pressure roller 22 is in its material and diameter such that on the one hand a sufficient pressure for the bonding of self-adhesive equipped Stamped 42 is ensured and on the other hand, the Abdeckmaterialbahn of the Both sides self-adhesive diecuts 42 are easily removed during dispensing can. Then this is specific to the properties of the self-adhesive on both sides Punches 42 matched on the Abdeckmaterialbahn.

About a rotatably mounted on the support plate 2 drive roller 23 is the Abdeckmaterialbahn with the punched products 42 guided such that the drive roller 23rd rotated synchronously to the speed of the Abdeckmaterialbahn.

The drive roller 23 is between the receptacle 21 for the roller 4 and the pressure roller 22 arranged.

So that the Abdeckmaterialbahn a large wrap around the drive roller has a guide roller 26 between the receptacle 21 for the roller 4th Abdeckmaterialbahn and the drive roller 23, which in turn from the Covering material is surrounded.

Finally, located on the holding plate 2 is a rotatably mounted receiving roller 25, which receives the Abdeckmaterialbahn after dispensing the punched 42 and the in particular via a belt 24 by the movement of the drive roller 23 in rotation is offset.

On the holding device 2 is an adjustable axis 3 on an adjustable Positioning aid 6 is provided, in the form of a festschraubbaren, rotatable mounted shaft 61, via which the Abdeckmaterialbahn of the receptacle 21 for the role 4 is guided in the direction of drive roller 23.

The pressure roller 22 is fixed on one side on the support plate 2 and carries on the another side a counter plate. The counter-plate and the holding plate 2 are in the Device that is pushed during the dispensing process, in the direction of Handle 1 extended executed. The counter-plate and the holding plate 2 are in their Form matched with the pinch roller 22 and the lever arm of the handle 1 so, that at the end of the dispensing operation the entire device is around the user can be easily tilted from this geometry resulting fulcrum. By This rotational movement always succeeds in conjunction with the positioning aid 6, on the one hand the last diecut 42 still safe to donate, that is from the Abdeckmaterialbahn on the other hand, the following, later becomes glued punching 42 still held securely on the Abdeckmaterialbahn. The entire device is tuned so that both in an empty and at a full pickup roller 25, the positioning accuracy of the self-adhesive on both sides Diecuts 42 is not adversely affected. This concerns in particular the Gear ratio of the belt drive between the rollers 23 and 25th

In the following, the invention is explained in more detail by means of an example, even without to intend any restrictions.

example

A double-sided adhesive tape (tesafix 51965), which consists of two adhesive layers with a mass application of 100 g / m ² on an interposed carrier film, namely a 12 micron thick polyester film, as well as a plastic-coated masking paper, with the width of 15 mm punched, in punched items of length also 15 mm.

• Abwicklung der doppelseitig klebenden Klebebandrolle
• Anstanzen der Klebeband-Bahn mit Hilfe eines Rotationsstanzzylinders
• Aufwickeln der gestanzten Klebebandbahn zu einer Rolle.

The punching takes place on a laboratory rotary punching machine. There are in a working width (corresponds to the punch width) of 160 mm wave-shaped cross cuts in the kiss-cut method performed. The cross-stitch line spacing is 15 mm. The punching process in the rotary die-cutting machine is as follows:

• Processing of the double-sided adhesive tape roll
• Punching the tape web by means of a rotary die cylinder
• Winding the stamped tape web into a roll.

The rotary punching cylinder is designed as follows:

gearing 1/8 CP 20 number of teeth 71 scope 225.43 mm Cross-grooves 1 measure 160 mm Longitudinal Number of Slots 15 corner radius ./.

It was punched a wave-shaped sinusoid with R = 0.75 mm.

The details are shown in detail in FIG. The arrow again gives the Machine direction. The section explains which dimensions the wave-shaped sine curve has.

In the adhesive side of a double-sided adhesive tape is punched with a Barrel length of 250 m (tesafix 51965), without the plastic coated on both sides Covering paper is punched.

The punching machine speed is as a minimum speed v = 2 m / min, as maximum speed v = 50 m / min.

After punching a separate step, the longitudinal cutting, the Roller winding and roll separation of the stamped rolls in dimension 15 mm width and 100 m length on a diameter of 76 mm cardboard core. This results in a quasi endless belt, on the diecuts of dimensions 15 x 15 mm arranged one behind the other.

In the comparative experiment with a straight cross-section results in a Dispensing the punched with a device explained above a maximum Applicator speed of 0.3 m / s.

In the inventive wave-shaped transverse punching results in a maximum Applicator speed of 2.0 m / s.

The comparison shows that "odd" running cross-cut forms in contrast to a straight line punched form a faster application of the Enable stamping.

Due to the non-linear executed punching line geometry are higher Cohesive forces generated as in a straight punched line. The holding forces between the two diecuts are caused by the flow properties the adhesive at the cutting edge after the cross punching. The longer the cut edge, the more fluid adhesive which recombines after the cut. It follows that the higher the cohesion forces between the diecuts are.

The higher the cohesion forces between the individual diecuts, the higher the adhesive tape can be applied faster.

Another, the expert completely surprising advantage is that a English:. German: v3.espacenet.com/textdoc? Rotary punching tool at the time of rotary punching has. By a deviating from the line punched line shape, for example a Waveform, is the punch line pressure of the tool at the time of full engagement reduces the punch cutting edge in the adhesive tape and over a longer distance, which at the same time corresponds to a longer period of time.

The rotary punching tool and the rotary punching machine become smaller Stamped line pressure less loaded in terms of power and load distribution. The force peaks occurring in rectilinear transverse punching cutters are at non-linear punching line geometries not available.

An odd line shape creates higher cohesive forces between two cross-cut adhesive tape diecuts as a straight line punched form. Due to the cohesive forces between two cross-cut diecuts that over the Length of the punching line and can be influenced by the embodiment is the Equipment of cover papers with regard to their release properties with standardized To shape properties. Usually, cover papers with different silicone coatings on the Bottom and top provided. These different silicone coatings ensure the handling and the whereabouts of the diecuts when unrolling the double-sided adhesive tape roll on the desired side of the masking paper. With an odd line punched form are also cover papers with both sides identical silicone coating can be used, which with a straight cut line shape not possible. The silicone coatings on the cover paper must be in place be different in linear line shape.

• Beidseitig klebende Stanzlinge zum Verkleben von Gegenständen wie zum Beispiel Leisten, Flachkabel, Papierstreifen oder Folienstreifen, insbesondere für die dauerhafte Fixierung von Flachkabeln auf Autodachinnenverkleidungen, bei der eine definierte Anzahl von einzelnen Klebebandstanzlingen auf den Untergrund aufgebracht werden.
• Einseitig klebende Stanzlinge auf einem Abdeckpapier zum Verkleben und Kennzeichnen von Gegenständen zum Beispiel zur Kennzeichnung von Kabeln, CDs, Disketten

The following applications are possible with the stamped products produced by the process according to the invention:

• Both-sided adhesive diecuts for bonding objects such as strips, flat cables, paper strips or film strips, in particular for the permanent fixation of flat cables on car roof linings, in which a defined number of individual adhesive tape diecuts are applied to the substrate.
• One-sided adhesive diecuts on a backing paper for bonding and marking objects, for example for marking cables, CDs, floppy disks

Claims (5)

A method of punching from an at least one side adhesive sheet, which is located on a cover material, into individual diecuts, characterized in that the punching line of the transverse punching, which divides the web over the entire width of the web in a non-branching line in the diecuts , Has a deviating from a straight line shape, wherein the cover material is not or minimally punched. A method according to claim 1, characterized in that the transverse punching has an angle of substantially 90 ° to the web direction. A method according to claim 1 or 2, characterized in that the punching line is arcuate, wave-shaped, sawtooth-like and / or zigzag-shaped. Method according to at least one of claims 1 to 3, characterized in that the web consists of an adhesive layer or of a carrier material which is equipped on one or both sides with an adhesive. Method according to at least one of the preceding claims, characterized in that on both sides of the cover an anti-adhesive coating is applied,
wherein the two anti-adhesive coatings do not differ in the degree of repellency to the same adhesive layer.

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