Method and device for producing a multilayer film

Patent metadata

Field	Value
Publication number	US-11124010-B2
Application number	US-201615750021-A
Country	US
Kind code	B2
Filing date	Aug 3, 2016
Priority date	Aug 5, 2015
Publication date	Sep 21, 2021
Grant date	Sep 21, 2021

Abstract

A method for producing a multilayer film, with the steps:a) providing a base body with a carrier ply and a transfer ply, which comprises at least one layer;b) applying an in particular UV-curable adhesive to at least one partial area of the transfer ply of the base body;c) applying a stamping foil which comprises a carrier ply and a transfer ply, with the result that the transfer ply of the stamping foil comes into contact with the transfer ply of the base body coated with adhesive;d) curing the adhesive by UV irradiation;e) removing the carrier ply of the stamping foil.

First claim

The invention claimed is:

1. A method for producing a decoration on a substrate using a multilayer transfer film, the method comprising:
a) providing a base body with a carrier ply and a transfer ply, the base body further comprising at least a detachment layer between the carrier ply and the transfer ply for detaching the carrier ply of the base body from other layers of the transfer film after application of the transfer film to the substrate;
b) applying a UV curable adhesive to at least one first partial area of the transfer ply of the base body, wherein no adhesive is applied in at least one second partial area of the transfer ply;
c) applying a stamping foil which comprises a carrier ply and a transfer ply, with the result that the transfer ply of the stamping foil comes into contact with the adhesive deposited on the transfer ply of the base body in the at least one first partial area;
d) curing the adhesive by UV irradiation;
e) removing the carrier ply of the stamping foil from the base body, whereby portions of the transfer ply of the stamping foil remains on the base body only where the adhesive is applied, the base body and the portions of the transfer ply of the stamping foil remaining on the base body forming the multilayer transfer film;
f) providing the substrate;
g) applying an adhesive to at least one of the multilayer transfer film or the substrate;
h) applying the multilayer transfer film to the substrate;
i) removing the carrier ply of the base body from the multilayer transfer film leaving the transfer ply of the base body and the portions of the transfer ply of the stamping foil remaining on the base body on the substrate to form the decoration on the substrate,
wherein a base body and a stamping foil are used which are formed such that a detachment force between the carrier ply of the stamping foil and the transfer ply of the stamping foil is lower than a detachment force between the carrier ply of the base body and the transfer ply of the base body, and
wherein the detachment force of the carrier ply of the stamping foil and the transfer ply of the stamping foil is at least 15% lower than between the carrier ply of the base body and the transfer ply of the base body.

2. The method according to claim 1 , wherein the adhesive is applied by screen printing or flexography.

3. The method according to claim 1 , wherein the adhesive is applied by inkjet printing.

4. The method according to claim 3 , wherein, for the application of the adhesive, an inkjet printhead with a resolution of from 300 to 1200 nozzles per inch (npi) is used.

5. The method according to claim 3 , wherein, for the application of the adhesive, an inkjet printhead with a nozzle diameter of from 15 μm to 25 μm with a tolerance of no more than ±5 μm.

6. The method according to claim 3 , wherein the adhesive is applied to the at least one partial area with a weight per unit area of from 0.5 g/m 2 to 20 g/m 2 .

7. The method according to claim 3 , wherein adhesive droplets are provided by the inkjet printhead with a frequency of from 6 kHz to 110 kHz.

8. The method according to claim 3 , wherein adhesive droplets with a volume of from 2 picoliter to 50 picoliter with a tolerance of no more than ±6% are provided by the inkjet printhead.

9. The method according to claim 3 , wherein adhesive droplets are provided by the inkjet printhead with a flight speed of from 5 m/s to 10 m/s with a tolerance of no more than ±15%.

10. The method according to claim 3 , wherein the adhesive is deposited on the transfer ply of the base body with a depositing temperature of from 40° C. to 45° C.

11. The method according to claim 3 , wherein a spacing between inkjet printhead and base body does not exceed 1 mm during the application of the adhesive.

12. The method according to claim 3 , wherein a relative speed between inkjet printhead and base body during the application of the adhesive is 10 m/min to 30 m/min.

13. The method according to claim 3 , wherein an adhesive with the following composition by volume is used:

2-phenoxyethyl acrylate
10% to 60%;

4-(1-oxo-2-propenyl)morpholine
 5% to 40%,

exo-1,7,7-trimethylbicyclo[2.2.1]-
10% to 40%;

hept-2-yl acrylate

2,4,6-trimethylbenzoyldiphenyl
 5% to 35%;

phosphine oxide

dipropylene glycol diacrylate
 1% to 20%;

urethane acrylate oligomer
 1% to 20%.

14. The method according to claim 3 , wherein an adhesive with a density of from 1 g/ml to 1.5 g/ml is used.

15. The method according to claim 1 , wherein the adhesive is applied in the form of an item of optically perceptible information.

16. The method according to claim 1 , wherein the adhesive is applied in a predefined positional relationship to a further item of optically perceptible information which is formed by the transfer ply of the base body.

17. The method according to claim 16 , wherein a position of the further item of optically perceptible information is detected before the application of the adhesive by means of a line scan camera, and the adhesive depositing is controlled depending on the detected position.

18. The method according to claim 1 , wherein the adhesive is pre-cured before the application of the stamping foil.

19. The method according to claim 18 , wherein the pre-curing of the adhesive is effected 0.02 s to 0.025 s after the application of the adhesive.

20. The method according to claim 18 , wherein the pre-curing of the adhesive is effected with UV light, the energy of which is at least 90% radiated in the wavelength range between 380 nm and 420 nm.

21. The method according to claim 18 , wherein the pre-curing of the adhesive is effected with a gross irradiance of from 2 W/cm 2 to 5 W/cm 2 .

22. The method according to claim 18 , wherein the pre-curing of the adhesive is effected with an illumination time of from 0.02 s to 0.056 s.

23. The method according to claim 18 , wherein, during the pre-curing of the adhesive, the viscosity thereof increases to from 50 mPas to 200 mPas.

24. The method according to claim 1 , wherein the application of the stamping foil to the base body is effected between a pressure roller and a counter-pressure roller.

25. The method according to claim 1 , wherein the application of the stamping foil to the base body is effected with a contact pressure of from 10 N to 80 N.

Assignees

• Leonhard Kurz Stiftung & Co Kg

Inventors

• Reuther Uwe

Classifications

• B32B2310/0831

  using UV radiation · CPC title

• B32B7/12

  using interposed adhesives or interposed materials with bonding properties · CPC title

• B32B2255/26

  Polymeric coating · CPC title

• B42D25/378

  Special inks · CPC title

• B32B27/32

  comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)} · CPC title