EP1590414A1

EP1590414A1 - Adhesive tape and use thereof for sticking printing blankets together

Info

Publication number: EP1590414A1
Application number: EP03785854A
Authority: EP
Inventors: Marc Husemann; Renke Bargmann
Original assignee: Tesa SE
Current assignee: Tesa SE
Priority date: 2003-01-29
Filing date: 2003-12-17
Publication date: 2005-11-02
Also published as: US20070059470A1; WO2004067663A1; AU2003294881A1

Abstract

The adhesive tapes (20) for sticking together printing blankets on a metallic retaining bar or metal rail during a printing process. The adhesive tapes are composed of at least one layer (25), a release liner, and of a melt pressure-sensitive adhesive layer (30) that is applied to said release liner layer on one side. Both sides of the release line layer (25) have the same or different release.

Description

tesa Aktiengesellschaft Hamburg

description

Adhesive tape and its use for gluing printing blankets

The invention relates to the use of adhesive tapes for bonding pressure doors to a metallic holding bar or metal rail during a printing process.

Various methods are known in the printing industry for transferring motifs onto, for example, paper by means of printing templates. One possibility is the so-called flexographic printing. Another embodiment uses printing blankets, with the aid of which the printing ink is transferred to the paper. Printing blankets consist of a polymer material and a fabric backing. The printing blankets are stretched around a cylinder for the printing process. There is a metallic holding bar at each end of the blanket for this tensioning process. This bar has to be glued to the printing blanket, but is also contaminated with solvent or water or printing ink in the course of the application. Therefore, high demands are placed on the shark bar, since high clamping forces are also used.

There are various options for fixing the holding bar. In the simplest case, the bar is glued to the printing blanket with a liquid adhesive. This method has been used for a long time, but has disadvantages such as slow processing or a high proportion of residual solvents that have to be evaporated.

Another very preferred option is the use of hot melt pressure sensitive adhesives. US-A-5,487,339 describes the use of hot melt pressure sensitive adhesives for gluing printing blankets. For example, hot-melt pressure sensitive adhesives based on nylon or polyurethane are cited here, which are suitable for this purpose. For processing, however, some additional requirements are placed on the PSA tape. On the one hand, a pure hotmelt PSA film cannot be used for processing, since the hotmelt PSA with the laminating roll is used in the lamination process or would stick to the laminating slide. There is therefore a need for a process aid, which must also be resistant to the temperature at temperatures of 200 ° C. and must have a defined separating force even after exposure to temperature and under temperature.

Furthermore, the adhesive must meet specific requirements, i. H. e.g. high resistance to solvents or water. Furthermore, there must be good adhesion to aluminum, steel and the fabric of the printing blanket.

There is therefore a need for an adhesive tape that meets the above requirements.

Surprisingly and unpredictably for the person skilled in the art, the object is achieved by the adhesive tapes according to the invention with the features specified in claim 1. It is a transfer tape consisting of a copolyamide as an adhesive and a release liner, which has a release force between 0.5 and 3 cN / cm at RT and a release force of 1 to 10 cN / cm after lamination at 220 ° C. The separation forces are measured according to test methods A and B.

The hot melt pressure sensitive adhesive, the adhesive tape is a copolyamide. The hotmelt PSA layer has a layer thickness of at least 100 μm, preferably between approximately 120 and approximately 250 μm, particularly preferably between approximately 150 and approximately 200 μm. The softening point of the copolyamide is between approximately 90 ° C. and approximately 160 ° C., in particular between approximately 100 ° C. and approximately 160 ° C.

The copolyamide used is free of tack. The release liner used is temperature stable up to at least 200 ° C, preferably up to at least 220 ° C. The release liner preferably has a weight of between approximately 80 g / m ² and approximately 200 g / m ² and a thickness of between approximately 70 μm and approximately 150 μm.

According to one embodiment, the release liner of the adhesive tape comprises a carrier material provided on both sides with a release liner layer, the material of the release layer being based on silicone or fluorinated compounds, in particular a polydimethylsiloxane. One side of the carrier material can have a release layer with a higher release than the release layer of the other side.

Both release layers can have different releases, different bulk orders. The two release layers with different releases can also have different chemical compositions.

The release layer connected to the hotmelt PSA layer preferably has a release force of between about 0.5 and 3 cN / cm at room temperature and a release force of about 1 to 10 cN / cm at about 220 ° C. after lamination.

As a carrier material e.g. Release paper used. The carrier material can be a polymer carrier, in particular consisting of polyimide, polyethylene naphthylate or polyethylene terephthalate. The layer thickness of the carrier material is between approximately 6 and approximately 100 μm, in particular between approximately 12 and approximately 50 μm.

Depending on the type of carrier material, the release layers have a mass application of at least approximately 0.8 g / m ² (carrier material = release paper) or at least 0.5 g / m ² (carrier material = polymer carrier), preferably 1.0 g / m ² on.

Furthermore, the invention relates to the use of the adhesive tapes according to one of claims 1 to 19 for bonding a printing blanket to a metallic holding bar during a printing process.

The invention further provides a method for applying adhesive tapes designed according to the invention to a printing blanket using a laminating device, with the following working steps: a) introducing heat via the laminating device and the release liner into the hotmelt PSA layer, b) applying pressure to the adhesive tape via the laminating device , the adhesive tape with its hot-melt pressure-sensitive adhesive layer being pressed onto the fabric side of the printing blanket, c) guiding the laminating device along the edge of the printing blanket while simultaneously unrolling the adhesive tape. The laminating device is a laminating roll or a laminating slide in order to introduce the heat, the laminating device is heated, the heating preferably taking place to at least 180 ° C. The lamination speed should be between approx. 1 and approx. 20 m / min.

The invention is explained below with reference to the drawings. It shows in vertical sectional views

1 is an adhesive tape with a release liner with a hot-melt adhesive layer made of a copolyamide applied on one side,

2 shows a further embodiment of an adhesive tape with a carrier material consisting of a release paper with layers of a release liner applied to both sides of the release paper, a pressure sensitive adhesive layer being applied to one of the two release liner layers,

3 shows a further embodiment of an adhesive tape made of a temperature-stable polymer carrier with layers of a release liner applied to both sides of the polymer carrier, a hotmelt PSA layer being applied to one of the two release liner layers,

4 shows a printing blanket with the adhesive tape to be applied,

Fig. 5 shows the printing blanket with applied copolyamide film and metal rail end before the initiation of the hot pressing process, and

Fig. 6 shows the printing blanket with applied copolymid film and metal rail end after hot pressing.

1 to 6, a printing blanket with 10 and an adhesive tape with 20 is designated. In the embodiment according to FIG. 1, the adhesive tape 20 consists of two layers, namely that of the release liner layer 25 and a hot-melt pressure-sensitive adhesive layer 30 which is applied thereon and which consists of a copoyamide. The copolyamide is characterized by the fact that it has at least a layer thickness of greater than 100 μm and a significantly higher tear strength than EVA or polyolefins. According to a preferred embodiment, the maximum layer thickness of the copolyamide is between 120 and 250 μm, in a very preferred embodiment of the invention between 150 and 200 μm.

The softening range of the copolyamide is essential for application as a heat-activatable film. In a preferred embodiment of the invention, the softening point of the copolyamide is above 90 ° C, in a more preferred version above 100 ° C. The maximum softening temperature is <160 ° C.

Furthermore, the copolyamide should not have any tack, as this would interfere with the lamination process on the printing blanket. The copolyamides required for the adhesive tape 20 are commercially available and are e.g. commercially available under the trade name Platamid ™ from Elf-Atochem or under the trade name Griltex ™ from EMS-Chemie.

Furthermore, at least one release liner is part of the adhesive tape 20 (FIG. 1). The release liner has to perform various functions, e.g. Give the hot melt pressure sensitive adhesive mechanical stability so that the hot melt pressure sensitive adhesive can be safely handled in the lamination process and applied cleanly to the blanket end. Furthermore, the release liner must also have high temperature stability, since it is not uncommon to use more than 220 ° C. for the lamination of the hotmelt PSA. As a further function, the release liner must have a controlled release force because, on the one hand, the adhesive tape 20 must be able to be unrolled and, on the other hand, the adhesive film must be clean even at high temperatures and without tears or residues, e.g. must be removable from a glassine liner.

According to a preferred embodiment, a glassine liner with at least 80 g / m ² weight and a thickness of at least 70 μm is therefore used. The maximum weight is 200 g / m ² and the maximum thickness is 150 μm. For the release force, a release paper 40 'is provided as a carrier material 40 on both sides with a release liner layer 25, 25', which is preferably based on silicone or fluorinated compounds. According to a further very preferred embodiment, polydimethylsiloxane is used as a release agent. The release paper 40 has a controlled release, that is to say both sides differ in their release force (FIG. 2). After that there is Adhesive tape 20 from the release paper 40 '. A layer 25, 25 'of a release liner is applied to each side of the release paper 40'. The melt adhesive layer 30 made of the copolyamide is applied to the layer 25 of the release liner.

It is therefore necessary for the adhesive tape 20 according to the invention that the release liner layer 25 'has a higher release than the release liner layer 25. In order to achieve these properties, the release liner layer 25 can differ from the release liner layer 25 'both in terms of the chemical composition and in terms of the amount applied. The minimal mass application of the release liner layers 25, 25 'is given by the surface roughness of the paper. If the release liner layer is too thin, the paper is not completely covered and when the copolyamide is removed, particularly under heat, paper fiber tears occur, which negatively influence the adhesion of the printing blanket 10. Therefore, the mass application of the release liner layers 25 and 25 'is at least 0.8 g / m ² , more preferably 1.0 g / m ² . In theory there are no upper limits, but with bulk applications of more than 3.0 g / m ² difficulties often arise with complete hardening of the release liner layers 25, 25 ', so that silicone can be transferred to the bond. In particular for the bonding of the printing blanket 10 with steel or aluminum bars, even small amounts of silicone would intensely interfere with the bonding. In the event that the release liner layers 25 and 25 'differ in their composition, the mass application of the release liner layers 25 and 25' may well be the same.

For the inventive use of the adhesive tape 30 for the adhesion of printing blankets 10, the exact release force of the release liner layer 25 to the copolyamide is also required. According to a preferred embodiment of this invention, the release liner layer 25 is damaged before being coated with a corona. The corona energy used is preferably between 20 and 70 Wmin / m ² .

The release liner layer 25 of the siliconized glassine paper preferably has a separating force between 0.5 and 3 cN / cm at RT and a separating force of 1 to 10 cN / cm after lamination at 220 ° C. The separation forces are determined according to test methods A and B.

Glassine liners are commercially available from Laufenberg, Rexam or Loparex. According to a further embodiment, release liners with a polymer carrier 50 are used. For the use of the adhesive tape 20, however, it is absolutely necessary that the polymer carrier 40 ″ as carrier material 40 briefly withstands temperatures of 200 ° C. or even 220 ° C. For this purpose, all materials known to the person skilled in the art can be used. mid, polyethylene naphthylate (PEN) or polyethylene terephthalate (PET). The structure of the adhesive tape 20 is shown in accordance with a further embodiment in Fig. 3. The adhesive tape 20 is then constructed such that the temperature-stable polymer carrier 40 "release liner layers 25, 25 on both sides ', wherein the hot-melt adhesive layer 11 made of the copolymer is applied to the release liner layer 25.

The polymer carrier 40 "must in turn have a stabilizing function for the copolyamide. The layer thickness of the polymer carrier 40" is between 6 μm and 100 μm, more preferably between 12 μm and 50 μm.

The mass application of the release liner layers 25 and 25 'is at least 0.5 g / m ² , more preferably 1.0 g / m ² . In theory there are no upper limits, but with bulk orders of more than 3.0 g / m ^{2 there} are difficulties with silicone transfer.

Process for the production of the adhesive tape

The copolyamide is coated onto the glassine liner via a melting nozzle or via an extrusion nozzle or via a roller applicator. For this purpose, heat is introduced for processing and the copolyamide is preferably heated to at least the corresponding softening point. According to a preferred embodiment, the copolyamide is coated via a melt nozzle or an extrusion nozzle. The contact method or the contactless method can be used for the melting nozzle coating. In order to achieve a uniform coating pattern, temperatures of at least 170 ° C. are generally required for the coating.

In the extrusion die coating process, the copolyamide is coated through an extrusion die. The extrusion dies used can advantageously come from one of the following three categories: T die, fish tail die and ironing die. The individual types differ in the shape of their flow channel. For coating, it is particularly preferred to coat the release liner with an ironing nozzle, in such a way that a polymer layer is formed on the carrier by a relative movement from nozzle to carrier. As a rule, the die gap of the extrusion die is larger than the layer thickness of the copolyamide to be achieved. Various methods can be used for the extrusion coating in order to transfer the copolyamide to the release liner without air bubbles. The copolyamide can be pressed against the liner using an air knife, it can be sucked onto the liner via a vacuum box or it can be placed on using electrostatic charging. For the production process of the adhesive tape, it may also be necessary for the release liner to be treated before the coating, for example by means of a corona or a flame pretreatment, in order to set the desired release forces.

Use of the tape

The adhesive tape 20 is used for bonding printing blankets 10 to aluminum or steel bars or other metal bars or rails 60. In a first step, the adhesive tape 20 is laminated onto the fabric side of the printing blanket 10. The fixation takes place at the ends of the printing blanket 10 (Fig. 4). The width of the two copolyamide strips is usually between 9 mm and 30 mm. For the lamination process, the adhesive tape 20 is unrolled and guided with the copolyamide side down to the fabric side of the printing blanket 10 lying upwards. For contacting, heat is applied via a laminating roller or a slide. In the simplest case, the laminating roll or the laminating slide is heated for this. According to a preferred embodiment, the temperature of the laminating roll or the carriage is at least 180 ° C. The temperature is entered into the copolyamide through the release liner, which then begins to melt and develop tack. In order to increase the adhesive force, pressure is still exerted on the laminating roller or chute. The print is in turn transferred via the release paper and the copolyamide film is pressed onto the tissue carrier of the printing blanket 10. The laminating roll or the laminating slide can be moved and travels along the edge of the printing blanket 10 while the adhesive tape 20 unrolls. The entire edge of the printing blanket 10 is provided with the copolyamide film via this movement. The lamination speed is preferably between 1 m / min and 20 m / min. The release function of the release liner is critical for the adhesive tape 20, since here the release force must also be higher in heat than that of the tissue carrier, since otherwise the mass would remain on the release liner after the lamination process and the roll-up of the release liner and thus the copolyamide would be pulled back from the tissue carrier. Another important aspect is the adhesive strength of the copolyamide to the fabric backing. The copolyamide in particular has a high adhesive strength at temperatures above the softening range - also compared to other hot melt adhesives. After the lamination process of the copolyamide onto the printing blanket 10, the printing blanket is clamped in an aluminum or steel or other metal rail. The process is exactly described in US 5,487,339. Fig. 5 shows how the printing blanket with copolyamide film and metal rail end is inserted into the hot press. The metal rail 60 is pressed together under pressure and heat input from the press (FIG. 6). The temperature in this step - depending on the copolyamide - is between 200 and 250 ° C. The pressing process should be at least 10 seconds, more preferably for 30 seconds. There are no upper limits, even if the efficient process speed is less than a minute.

The advantages of the adhesive tape according to the invention are described below in several experiments.

experiments

The adhesive tapes of the invention are described below by experiments.

The following test methods were used to evaluate the technical adhesive properties of the PSAs produced.

test methods

18Q ^0. Deduction ft. (Test A).

A 20 mm wide strip of a copolyamide applied with a layer thickness of 150 μm is pulled off the release liner at 180 ° using a Zwick tensile testing machine. The measurement results are given in cN / cm and are averaged from three measurements. All measurements were carried out at room temperature under air-conditioned conditions. The take-off speed is 300 mm / min.

A 20 mm wide strip and approximately 500 mm long sample strip of adhesive tape is laminated onto a grease-free steel plate with the hot-melt adhesive side at 200 ° C., a contact pressure of 20 N and a speed of 5 m / min. The release liner is then immediately pulled off the hot melt adhesive at a 180 ° angle using a Zwick tensile testing machine. The take-off speed is 300 mm / min. The measurement results are given in cN / cm and are averaged from three measurements.

Solvent resistance (test C) The gluing of a 5 cm wide strip of a printing blanket glued to an aluminum profile is immersed in a solvent for 24 hours at room temperature. On- the composite is then dried and the aluminum profile is pulled off in a tensile testing machine from Zwick at 500 mm / min. The test is passed if the printing blanket breaks.

Reference example 1:

In a SIG single-screw extruder, the copolyamide Griltex ™ D 1500 (from EMS-Chemie) is coated with a die temperature of 180 ° C on a release paper coated with 1.5 g / m ² PE. The layer thickness of the hot melt adhesive was 150 μm. The copolyamide film was pressed onto the release paper by means of electrostatic charging. The temperature of the coating roller was 23 ° C.

Reference example 2:

The copolyamide Griltex ™ D 1500 (from EMS-Chemie) is coated in a SIG single-screw extruder with a die temperature of 180 ° C. on a release paper coated with 0.5 g / m ^{2 of} polydimethylsiloxane. The layer thickness of the hot melt adhesive was 150 μm. The copolyamide film was pressed onto the release paper by means of electrostatic charging. The temperature of the coating roller was 23 ° C.

Reference example 3: In a SIG single-screw extruder, low density polyethylene (Lacgtene ™ FE 8000, Elf Atofina) is coated with a nozzle temperature of 160 ° C. on a release paper coated with 1.6 g / m ^{2 of} polydimethylsiloxane. The layer thickness of the hot melt adhesive was 150 μm. The PE film was pressed onto the release paper by means of electrostatic charging. The temperature of the coating roller was 23 ° C.

Example 4:

In a SIG single-screw extruder, the copolyamide Griltex ™ D 1500 (from EMS-Chemie) with a die temperature of 180 ° C. is coated with 1.5 g / m ² polydimethylsiloxane and with 40 Wmin / m ² with corona (400 W 20 m / min web speed ) pre-treated coated release paper. The layer thickness of the hot melt adhesive was 150 μm. The copolyamide film was pressed onto the release paper by means of electrostatic charging. The temperature of the coating roller was 23 ° C.

Example 5: In a SIG single-screw extruder, the copolyamide Griltex ™ D 1500 (from EMS-Chemie) with a die temperature of 180 ° C is coated with 1.5 g / m ² polydimethylsiloxane, polydimethylsiloxane and with 40 Wmin / m ² with corona (400 W 20 m / min Web speed) pretreated coated release paper. The layer thickness of the hot melt adhesive was 180 μm. The copolyamide film was pressed onto the release paper by means of electrostatic charging. The temperature of the coating roller was 23 ° C.

Bonding with printing blanket A 50 cm wide printing blanket from Reeves Brothers is laminated along the edge with a 15 mm wide adhesive strip from Examples 1 to 5, analogous to test method B, on the fabric side. For reference examples 1 and 2, the release liner was slowly removed in the cold. In Examples 3 to 5, the release liner was pulled off immediately and the printing blanket with adhesive strips was pushed into an aluminum profile from Reeves Breaders. The adhesive film is located on the upward curved side of the aluminum profile. Then the upper, upward-curved side of the aluminum profile is pressed down onto the adhesive film using a hot press from Bürkle. The pressing process takes place at 220 ° C and runs for 60 seconds. It is then cooled to room temperature.

Results:

5 different examples were produced to investigate the different adhesive tapes. Examples 1 to 3 are reference examples, Examples 4 and 5 correspond to the main inventive claim. Different release liners with a copolyamide as adhesive were used in reference examples 1 and 2, and a polyolefin as thermoplastic polymer in reference example 3.

In tests 1 and B, the 180 ° pull-off force and the 180 ° release liner pull-off force of all 5 examples were determined in the first experiments. The measured values are listed in Table 1.

Table 1

Test A Test B pull-off force in cN / cm 180 ° release liner pull-off force in cN / cm ^a release liner splits in part ^b release liner splits

Table 1 shows that Examples 4 and 5 can be easily laminated and applied. Reference example 3 also fulfills the application conditions. Reference examples 1 and 2 cannot be laminated.

In Table 2, the printing blanket bonds were examined in particular under the influence of solvents.

From Table 2 it follows that Examples 4 and 5 according to the invention pass the test well. Reference examples 1 and 2 also pass the test and make it clear that copolyamides are very suitable for gluing printing blankets. Only reference example 3 based on a polyolefin hot melt adhesive shows that not all thermoplastics are suitable for gluing printing blankets.

Claims

claims

1. Adhesive tape, in particular for bonding to a metallic holding bar or metal rail during the printing process of printing blankets, characterized in that the adhesive tape (20) comprises at least one layer (25) made of a release liner and a hot melt pressure-sensitive adhesive layer (30) applied on one side thereof. wherein the two sides of the release liner layer (25) have the same or different release.

2. Adhesive tape according to claim 1, characterized in that the hot melt pressure sensitive adhesive (30) is a copolyamide.

Adhesive tape according to one of claims 1 or 2, characterized in that the hotmelt PSA layer (30) has a layer thickness of at least 100 μm, preferably between approximately 120 and approximately 250 μm, particularly preferably between approximately 150 and approximately 200 μm.

Adhesive tape according to one of claims 2 or 3, characterized in that the softening point of the copolyamide of the hotmelt PSA layer (30) is between approximately 90 ° C and approximately 160 ° C, in particular between approximately 100 ° C and approximately 160 ° C ,

5. Adhesive tape according to one of claims 2 to 4, characterized in that the copolyamide is free of tack.

6. Adhesive tape according to one of the preceding claims 1 to 5, characterized in that the release liner is temperature stable up to at least 200 ° C, preferably up to at least 220 ° C.

7. Adhesive tape according to one of the preceding claims 1 to 6, characterized in that the release liner has a weight of between approximately 80 g / m ² and approximately 200 g / m ² .

8. Adhesive tape according to one of the preceding claims 1 to 7, characterized in that the release liner layer (25, 25 ') has a thickness of between approximately 70 μm and approximately 150 μm.

9. Adhesive tape according to one of the preceding claims 1 to 8, characterized in that the release liner comprises a carrier material (40) equipped on both sides with a release liner layer.

10. Adhesive tape according to claim 9, characterized in that the material of the release liner layer is based on silicone or fluorinated compounds, in particular is a polydimethylsiloxane.

11. Adhesive tape according to one of claims 9 or 10, characterized in that one side of the carrier material (40) has a release liner layer (25, 25 ') with a higher release than the release liner layer (25, 25') of the other side ,

12. Adhesive tape according to claim 11, characterized in that the two release liner layers (25, 25 ') with different releases have different mass application.

13. Adhesive tape according to one of claims 11 or 12, characterized in that the two release liner layers with different releases have different chemical compositions.

14. Adhesive tape according to one of claims 9 to 13, characterized in that the release liner layer connected to the hotmelt PSA layer (30) is pretreated, in particular pretreated with corona.

15. Adhesive tape according to one of claims 9 to 14, characterized in that the release liner layer (25, 25 ') connected to the hotmelt PSA layer (30) has a release force at room temperature of between 0.5 and 3 cN / cm and after lamination at approx. 220 ° C has a separating force of approx. 1 to 10 cN / cm.

16. Adhesive tape according to one of claims 9 to 15, characterized in that the carrier material (40) is a release paper (40 ').

17. Adhesive tape according to one of claims 9 to 15, characterized in that the carrier material (40) is a polymer carrier (40 "), in particular consisting of polyimide,

Polyethylene naphthylate or polyethylene terephthalate.

18. Adhesive tape according to claim 17, characterized in that the carrier material (40) has a layer thickness of between approximately 6 and approximately 100 μm, in particular between approximately 12 and approximately 50 μm.

19. Adhesive tape according to one of claims 9 to 18, characterized in that the release liner layers, depending on the type of carrier material (40), a mass application of at least about 0.8 g / m ² (carrier material = release paper), or have at least 0.5 g / m ² (carrier material = polymer carrier), preferably 1.0 g / m ² .

20. A process for producing the adhesive tape according to claims 1 to 19, characterized in that the hotmelt pressure-sensitive adhesive is coated by air-bubble-free extrusion coating onto a release paper pretreated with corona.

21. Use of an adhesive tape according to one of claims 1 to 19 for bonding a printing blanket to a metallic holding bar during a printing process.

22. A method for applying and gluing adhesive tapes of an adhesive tape according to one of claims 1 to 19 to a printing blanket (10) using a laminating device with the following steps: a) introducing heat via the laminating device and the release liner into the hotmelt PSA layer, b) Exerting pressure on the adhesive tape over the laminating device, the adhesive tape with its hotmelt PSA layer being pressed onto the fabric side of the printing blanket, c) guiding the laminating device along the edge of the printing blanket while simultaneously unrolling the adhesive tape.

22. The method according to claim 21, characterized in that the laminating device is a laminating roll or a laminating slide.

23. The method according to any one of claims 21 or 22, characterized in that the laminating device is heated to introduce heat.

24. The method according to claim 23, characterized in that the laminating device is heated to at least 180 ° C.

25. The method according to any one of claims 21 to 24, characterized in that the lamination speed is between approximately 1 and approximately 20 m / min.