COMPOSITE FILM AND PRODUCTION THEREOF USING A COATING FACILITY

Abstract

The invention relates to a method for producing a composite film with a polyurethane-based reactive hot-melt layer using a coating facility, having the steps of a) optionally applying a primer onto a support material; b) applying the polyurethane-based reactive hot-melt layer onto the primer or directly onto the support material; c) applying a lacquer layer onto the polyurethane-based reactive hot-melt layer in order to produce the composite film on the support material; d) optionally embossing the composite film on the support material; and e) separating the composite film from the support material. The invention additionally relates to a composite film which can be obtained by such a method and to the use thereof.

Claims

1. A method for producing a composite film having a polyurethane-based reactive hot-melt layer with the aid of a coating apparatus, which contains the steps a) optionally applying a primer onto a support material; b) applying the polyurethane-based reactive hot-melt layer onto the primer or directly onto the support material; c) applying a lacquer layer on the polyurethane-based reactive hot-melt layer in order to produce the composite film on the support material; d) optionally embossing the composite film on the support material; e) separating the composite film from the support material.

2. The method as claimed in claim 1, characterized in that the primer is provided.

3. The method as claimed in claim 1, characterized in that the primer is used as a separating agent.

4. The method as claimed in claim 1, characterized in that the hot-melt layer and the lacquer layer are each applied in one coat.

5. The method as claimed in claim 1, characterized in that the reactive hot-melt layer has a thickness in the range of from 20 μm to 150 μm.

6. The method as claimed in claim 1, characterized in that the lacquer layer has a thickness in the range of from 5 μm to 25 μm.

7. The method as claimed in claim 1, characterized in that the application of the primer forms at least one coloring layer or an opacifying layer and is preferably a lacquer, in particular a UV-curing or a water-based or both a UV-curing and a water-based lacquer.

8. The method as claimed in claim 1, characterized in that the surface of the support material is provided with a reactivatable adhesive layer before the application of the primer, or this adhesive layer is used as the primer.

9. The method as claimed in claim 1, characterized in that a decorative layer is produced before step b), preferably by digital printing.

10. The method as claimed in claim 1, characterized in that the application of the primer is carried out using an applicator roller or slit die of the coating apparatus.

11. The method as claimed in claim 1, characterized in that the primer comprises an embossed structure and a decoration which is matched to the embossed structure is printed on, preferably after step b) and before step c).

12. The method as claimed in claim 1, characterized in that the support material is or at least contains a metal foil, a CPL laminate, melamine paper, separating paper, silicone-coated web material or a plastic film, in particular a plastic film.

13. The method as claimed in claim 1, characterized in that the support material has a thickness of from 30 μm to 400 μm.

14. The method as claimed in claim 1, characterized in that the support material is a conveyor belt of the coating apparatus.

15. The method as claimed in claim 1, characterized in that the application of the reactive hot-melt layer is carried out using an applicator roller with or without a smoothing roller or a slit die with or without a roll bar of the coating apparatus.

16. The method as claimed in claim 1, characterized in that the reactive hot-melt layer is a moisture-curing layer.

17. The method as claimed in claim 1, characterized in that the reactive hot-melt layer is a reactive polyurethane hot-melt, which is preferably obtainable from isocyanate-reactive polymers and polyisocyanates, and optionally additives.

18. The method as claimed in 17 claim 1, characterized in that the embossing of the composite film is provided.

19. The method as claimed in claim 1, characterized in that the embossing is carried out using an embossing roller of the coating apparatus.

20. The method as claimed in claim 1, characterized in that the separation of the composite film from the support material is carried out by peeling after crystallization or full reaction of the reactive hot-melt layer.

21. The method as claimed in claim 1, characterized in that the reactive hot-melt layer contains at least one filler, in particular an abrasion-resistant filler.

22. The method as claimed in claim 1, characterized in that the coating apparatus is a roll-to-roll apparatus.

23. The method as claimed in claim 1, characterized in that the lacquer of the lacquer layer in step c) can be crosslinked by means of electron radiation or UV radiation.

24. The method as claimed in claim 1, characterized in that the support material is reused for the method.

25. A composite film obtainable by a method as claimed in claim 1.

26. (canceled)

Description

[0104] In the figure:

[0105] FIG. 1 shows a coating apparatus for producing composite films according to the invention

[0106] In the coating apparatus 1, a support film 2 as support material is delivered from a roll unit 3 to a priming unit 4, in which the support film 2 is primed and optionally provided with reactivatable adhesive on the surface of the support film. The support film 2 subsequently passes through a printing unit 5, which makes it possible to print on the primed support film surface. The support film surface is then coated with a polyurethane-based reactive hot-melt in a subsequent coating unit 6. A UV lacquer layer is then applied in a lacquering unit 7. The curing unit 8 in the form of a UV lamp cures the UV lacquer. Embossing is subsequently carried out in an embossing unit 9, followed by the separation and winding of the support film 2 and of the composite film 10 according to the invention.

LIST OF REFERENCES

[0107] 1 coating apparatus

[0108] 2 support film

[0109] 3 roll unit

[0110] 4 priming unit

[0111] 5 printing unit

[0112] 6 coating unit

[0113] 7 lacquering unit

[0114] 8 curing unit

[0115] 9 embossing unit

[0116] 10 composite film