Method for producing a multilayer film and multilayer film as well as a security element and a security document

Patent metadata

Field	Value
Publication number	US-10960704-B2
Application number	US-201816498580-A
Country	US
Kind code	B2
Filing date	Mar 26, 2018
Priority date	Mar 29, 2017
Publication date	Mar 30, 2021
Grant date	Mar 30, 2021

Abstract

A method for producing a multilayer film wherein, in at least one step, at least one ink is applied to a layer by means of inkjet printing, whereby at least one area at least of a first print is provided, and wherein the first print is covered by at least one further layer. A multilayer film, in particular produced by a method according to the invention, having at least a first print, wherein the print is produced by means of inkjet printing and wherein the print is arranged within the multilayer film and is covered by further layers of the multilayer film.

First claim

The invention claimed is:

1. A method for producing a multilayer film, wherein, in at least one step, at least one ink is applied to a layer by means of inkjet printing, whereby a first print is provided in at least one area, and wherein the first print is covered by at least one further layer, and
wherein the ink is applied to a replication layer at least in areas, and
wherein the replication layer is replicated together with the print applied thereto, whereby a replication structure is impressed into the replication layer and the print, and
wherein during the replication of the replication layer, the print is pressed into the replication layer and/or compressed and/or deformed, and
wherein the replication is effected in register with the print.

2. The method according to claim 1 , wherein an individualized print is provided.

3. The method according to claim 1 , wherein the print is formed through an application of a single ink.

4. The method according to claim 1 , wherein the print is formed through an application of several inks.

5. The method according to claim 1 , wherein the ink is applied to several layers of the multilayer film.

6. The method according to claim 1 , wherein the ink is applied to a carrier layer at least in areas.

7. The method according to claim 1 , wherein the ink is applied to a detachment layer at least in areas.

8. The method according to claim 1 , wherein the ink is applied to a protective layer at least in areas.

9. The method according to claim 1 , wherein the ink is applied, at least in areas, to a reflective layer.

10. The method according to claim 1 , wherein the ink is applied to an adhesive layer and/or to a primer layer at least in areas.

11. The method according to claim 1 , wherein the ink, or a print of a UV-curing replication varnish is poured-over, layered-over and/or encapsulated.

12. The method according to claim 11 , wherein the application of the ink, or the provision of the print is carried out in the same manufacturing step as a UV replication.

13. The method according to claim 1 , wherein the ink and a UV-curing replication varnish are cured together and/or the ink undergoes post-crosslinking through curing of the UV-curing replication varnish.

14. The method according to claim 1 , wherein the ink is applied to a substantially smooth surface of the replication layer.

15. The method according to claim 1 , wherein a position of the replication structure with respect to the print is within +/−0.4 mm.

16. The method according to claim 1 , wherein the ink applied to the replication layer has a layer thickness substantially twice as thick as a depth of the replication structure introduced into the replication layer during the replication.

17. The method according to claim 1 , wherein an adhesion-promoter layer is applied to a layer and/or to the ink or to the print at least in areas.

18. The method according to claim 17 , wherein the at least one adhesion-promoter layer is applied only in those areas to which the ink is also applied.

19. The method according to claim 1 , wherein an anti-adhesion layer is applied, at least in areas, to a layer of the multilayer film and/or to the ink or to the print.

20. The method according to claim 1 , wherein an ink with laser-sensitive pigments is provided.

21. The method according to claim 1 , wherein the ink or the print is irradiated at least in areas by means of a radiation source, whereby an optical appearance of the print changes.

22. The method according to claim 21 , wherein at least one invisible and/or transparent ink is applied and the ink or the print is irradiated with a laser at least in areas, whereby the irradiated areas become visible.

23. The method according to claim 21 , wherein at least one ink is applied adjacent to at least one visible marking and/or partial marking and/or to at least one visible motif and/or to a visible partial motif and the ink or the print is irradiated with a laser at least in areas, whereby the irradiated areas of the ink or the print become visible and, together with the adjacent marking and/or the adjacent partial marking and/or the adjacent motif and/or the adjacent partial motif, form an overall marking or an overall motif.

24. The method according to claim 21 , wherein at least one visible and/or colored and/or opaque ink is applied and the ink or the print is irradiated with a laser at least in areas, whereby an optical appearance of the irradiated areas change.

25. The method according to claim 1 , wherein at least one light-absorbing, print is provided at least in areas.

26. A method for producing a multilayer film, wherein, in at least one step, at least one ink is applied to a layer by means of inkjet printing, whereby a first print is provided in at least one area, and wherein the first print is covered by at least one further layer, and
wherein the ink is applied to a replication layer at least in areas, and
wherein the replication layer is replicated together with the print applied thereto, whereby a replication structure is impressed into the replication layer and the print, and
wherein the print is compressed and/or deformed during the replication.

27. The method according to claim 26 , wherein the replication is effected in register with the print.

28. A method for producing a multilayer film, wherein, in at least one step, at least one ink is applied to a layer by means of inkjet printing, whereby a first print is provided in at least one area, and wherein the first print is covered by at least one further layer, and
wherein a surface of a replication layer is replicated, whereby at least one diffractive structure is impressed into the surface of the replication layer, and
wherein the ink is applied to the replicated surface of the replication layer at least in areas, and
wherein the ink is applied in such a way that the ink only partially fills the at least one diffractive structure on the surface of the replication layer.

29. A method for producing a multilayer film, wherein, in at least one step, at least one ink is applied to a layer by means of inkjet printing, whereby a first print is provided in at least one area, and wherein the first print is covered by at least one further layer, and
wherein a print, which is formed as a wash varnish, is provided, and
wherein a metal layer and/or a metallization is applied, and the wash varnish is then removed by a solvent treatment together with parts of the metal layer and/or the metallization, whereby the metal layer and/or the metallization remains only where no wash varnish has been applied.

30. The method according to claim 29 , wherein the ink is applied to a replication layer at least in areas.

31. The method according to claim 30 , wherein the replication layer is replicated together with the print applied thereto.

32. The method according to claim 31 , wherein during the replication, the print is pressed into the replication layer.

33. The method according to claim 30 , wherein the ink is applied in such a way that, during a subsequent replication, a replication structure is impressed into the print, but not into an area of the replication layer covered by the print.

34. The method according to claim 30 , wherein, during a subsequent rep

Assignees

• Leonhard Kurz Stiftung & Co Kg

Inventors

• Czichos Michael
• Katschorek Haymo
• Pforte Klaus

Classifications

• B42D25/41 Primary

  using electromagnetic radiation (B42D25/435 takes precedence) · CPC title

• B42D25/47

  using adhesives · CPC title

• B42D25/425 Primary

  by deformation, e.g. embossing · CPC title

• B42D25/328

  Diffraction gratings; Holograms · CPC title