Method and device for applying a film

Patent metadata

Field	Value
Publication number	US-10562292-B2
Application number	US-201615559997-A
Country	US
Kind code	B2
Filing date	Mar 4, 2016
Priority date	Mar 23, 2015
Publication date	Feb 18, 2020
Grant date	Feb 18, 2020

Abstract

An application apparatus and also printing apparatus for implementing such a method.

First claim

The invention claimed is:

1. A method for applying a transfer ply of a foil to a substrate, the method comprising:
a) applying a radically curable adhesive to at least one subregion of the transfer ply by means of an inkjet printhead having a resolution of 300 to 1200 nozzles per inch (npi), wherein the inkjet printhead prints droplets of the adhesive directly on the transfer ply;
b) pre-curing the adhesive printed on the transfer ply by UV irradiation;
c) applying the at least one subregion of the transfer ply provided with adhesive to the substrate;
d) fully curing the adhesive applied to the substrate by UV irradiation;
e) peeling a carrier ply of the foil from the at least one subregion of the transfer ply.

2. The method as claimed in claim 1 , further comprising:
applying a thermoplastic toner to at least one subregion of the substrate;
applying the transfer ply to the substrate;
causing an applied pressure, and heat, to act on the transfer ply;
peeling a carrier ply of the foil from the at least one subregion of the transfer ply.

3. The method as claimed in claim 1 , wherein the adhesive is applied using an inkjet printhead having a nozzle diameter of 15 μm to 25 μm with a tolerance of not more than ±5 μm.

4. The method as claimed in claim 1 , wherein the adhesive is applied with a weight per unit area of 0.5 g/m 2 to 20 g/m 2 to the at least one subregion.

5. The method as claimed in claim 1 , wherein the inkjet printhead provides droplets of adhesive with a frequency of 6 kHz to 110 kHz.

6. The method as claimed in claim 1 , wherein the inkjet printhead provides droplets of adhesive with a volume of 2 to 50 picoliters (pl) with a tolerance of not more than ±6%.

7. The method as claimed in claim 1 , wherein the inkjet printhead provides droplets of adhesive with a flight velocity of 5 m/s to 10 m/s with a tolerance of not more than ±15%.

8. The method as claimed in claim 1 , wherein the adhesive is applied with an application temperature of 40° C. to 45° C. to the transfer ply.

9. The method as claimed in claim 1 , wherein a distance between inkjet printhead and substrate during application of the adhesive does not exceed 1 mm.

10. The method as claimed in claim 1 , wherein a relative velocity between inkjet printhead and transfer ply during application of the adhesive is 10 m/min to 30 m/min.

11. The method as claimed in claim 1 , wherein an adhesive having an density of 1 g/ml to 1.5 g/ml is used.

12. The method as claimed in claim 1 , wherein the pre-curing of the adhesive takes place at 0.02 s to 0.025 s after the application of the adhesive.

13. The method as claimed in claim 1 , wherein the pre-curing of the adhesive takes place with UV light at least 90% of whose energy is emitted in the wavelength range between 380 nm and 420 nm.

14. The method as claimed in claim 1 , wherein the pre-curing of the adhesive takes place with a gross irradiation power of 2 W/cm 2 to 5 W/cm 2 .

15. The method as claimed in claim 1 , wherein the pre-curing of the adhesive takes place with an exposure time of 0.02 s to 0.056 s.

16. The method as claimed in claim 1 , wherein the pre-curing of the adhesive is accompanied by an increase in its viscosity to 50 mPas to 200 mPas.

17. The method as claimed in claim 1 , wherein the application of the at least one subregion of the transfer ply provided with adhesive to the substrate takes place between a press roll and an impression roll.

18. The method as claimed in claim 1 , wherein the application of the at least one subregion of the transfer ply provided with adhesive to the substrate takes place with an applied pressure of 10 N to 80 N.

19. The method as claimed in claim 1 , wherein the application of the at least one subregion of the transfer ply provided with adhesive to the substrate takes place 0.2 s to 1.7 s after the pre-curing of the adhesive.

20. The method as claimed in claim 1 , wherein the substrate, before the application of the at least one subregion of the transfer ply provided with adhesive, is pretreated by a corona treatment, a plasma treatment or by flaming.

21. The method as claimed in claim 1 , wherein the full curing of the adhesive takes place at 0.2 s to 1.7 s after the application of the transfer ply to the substrate.

22. The method as claimed in claim 1 , wherein the full curing of the adhesive takes place with UV light at least 90% of whose energy is emitted in the wavelength range between 380 nm and 420 nm.

23. The method as claimed in claim 1 , wherein the full curing of the adhesive takes place with a gross irradiation power of 12 W/cm 2 to 20 W/cm 2 .

24. The method as claimed in claim 1 , wherein the full curing of the adhesive takes place with an exposure time of 0.04 s to 0.112 s.

25. The method as claimed in claim 1 , wherein the detachment of the carrier ply takes place 0.2 s to 1.7 s after the full curing of the adhesive.

26. The method as claimed in claim 1 , wherein the application of the transfer ply to the substrate takes place by means of a thermoplastic toner at a temperature of 100° C. to 250° C.

27. The method as claimed in claim 1 , wherein the application of the transfer ply to the substrate is carried out by means of a thermoplastic toner in a roll arrangement with a press nip of 5 mm to 20 mm.

28. The method as claimed in claim 1 , wherein a foil is used whose transfer ply has a detachment layer of an aqueous polyurethane copolymer free from wax and/or silicone, with a layer thickness of 0.01 μm to 2 μm, which is disposed on a surface of the carrier ply.

29. The method as claimed in claim 28 , wherein a foil is used whose transfer ply has a varnish layer of nitrocellulose, polyacrylate and/or polyurethate copolymer with a layer thickness of 0.1 μm to 5 μm, which is disposed on a detachment layer surface facing away from the carrier ply.

30. The method as claimed in claim 29 , wherein a foil is used whose transfer ply has a metal layer comprising at least one of aluminum, chromium silver gold or copper with a layer thickness of 10 nm to 200 nm, which is disposed on a varnish layer surface facing away from the carrier ply.

31. The method as claimed in claim 1 , wherein a foil is used whose transfer ply has a primer layer of polyacrylates with a layer thickness of 0.1 μm to 1.5 μm, which forms a transfer ply surface facing away from the carrier ply.

32. The method as claimed in claim 31 , wherein the primer layer is microporous.

33. The method as claimed in claim 31 , wherein the primer layer has a surface tension of 38 mN/m to 46 mN/m.

34. The method as claimed in claim 31 , wherein the primer layer has a pigmentation number of 0.5 cm 3 /g to 120 cm 3 /g.

35. The method as claimed in claim 31 , wherein the primer layer has a melting point of 60° C. to 130° C.

36. The method as claimed in claim 1 , wherein, before the application of the transfer ply, a print layer is applied by means of a further inkjet printhead to the substrate.

37. The method as claimed in claim 1 , wherein the transfer ply is applied to a three-dimensional, domed, curved, cylindrical or flat substrate.

38. The method as claimed in claim 37 , wherein the transfer ply is applied using a pressing ap

Assignees

• Leonhard Kurz Stiftung & Co Kg

Inventors

• Kosalla Konstantin
• Plaia Ulrike

Classifications

• B44C1/16

  for applying transfer pictures or the like · CPC title

• B41F19/005

  with means for applying metallic, conductive or chargeable material · CPC title

• B44C1/105 Primary

  comprising an adhesive layer (decalcomania B44C1/16; adhesive tapes C09J7/20) · CPC title

• B32B37/1284

  Application of adhesive · CPC title

• B41F19/004 Primary

  with means for applying adhesive · CPC title