Foil printing

Patent metadata

Field	Value
Publication number	US-2018319136-A1
Application number	US-201615772079-A
Country	US
Kind code	A1
Filing date	Jan 14, 2016
Priority date	Jan 14, 2016
Publication date	Nov 8, 2018
Grant date	—

Abstract

Herein is described a method of applying foil from a foil web to a substrate. The method may comprise: ink-jet printing a UV-curable adhesive onto the substrate in a predetermined image area; subjecting the adhesive to a first curing by exposing the adhesive to UV light in a dosage range of 140-170 mJ/cm 2 ; passing the substrate and a foil web through a nip where the foil web is pressed against the adhesive; subjecting the adhesive disposed between the substrate and the foil web to a second curing by exposing the adhesive to UV light in a dosage of at least 250 mJ/cm 2 ; and separating excess foil from the substrate, to leave foil on the predetermined image area. Substrates and UV-curable adhesives are also described.

First claim

1 . A method of applying foil from a foil web to a substrate, the method comprising:
a. ink-jet printing a UV-curable adhesive onto the substrate in a predetermined image area; b. subjecting the adhesive to a first curing by exposing the adhesive to UV light in a dosage range of 140-170 mJ/cm 2 ; c. passing the substrate and a foil web through a nip where the foil web is pressed against the adhesive; d. subjecting the adhesive disposed between the substrate and the foil web to a second curing by exposing the adhesive to UV light in a dosage of at least 250 mJ/cm 2 ; and e. separating excess foil from the substrate, to leave foil on the predetermined image area.

2 . The method of claim 1 , wherein the UV-curable adhesive comprises
a. an acrylic polymer; b. a monofunctional monomer; c. a multifunctional monomer; and d. a photoinitiator.

3 . The method according to claim 2 , wherein the acrylic polymer is present in the UV-curable adhesive in an amount representing from about 1% to about 10% of the total weight of the UV-curable adhesive.

4 . The method according to claim 2 , wherein the acrylic polymer has a molecular weight in the range of from about 5,000 to about 20,000 Daltons and/or has a glass transition temperature (T g ) that is below 60° C.

5 . The method of claim 2 , wherein the acrylic polymer is a resin that does not polymerise with the monofunctional monomer or the multifunctional monomer during the first or second curing.

6 . The method of claim 2 , wherein the acrylic polymer comprises a copolymer of methyl methacrylate and butyl methacrylate.

7 . The method according to claim 2 , wherein the UV-curable adhesive has a viscosity, before the first curing and when measured at the temperature at which the adhesive will be when ink-jet printed onto the substrate (the jetting temperature), of from about 5 cP to about 20 cP.

8 . The method according to claim 1 , wherein the adhesive is printed in a thickness of about 95 μm or less.

9 . The method according to claim 2 , wherein the monofunctional monomer and the multifunctional monomer each comprise at least one acrylate group.

10 . The method of claim 1 , wherein the foil that is left on the predetermined image area comprises a film or sheet having a thickness of about 200 μm or less.

11 . The method of claim 1 , wherein the UV light source is an LED UV source.

12 . The method of claim 1 , wherein the UV light has a wavelength in a range of from 315 nm to 450 nm.

13 . A substrate having foil adhered thereto by an adhesive, the adhesive formed from the curing of an adhesive composition comprising:
a. an acrylic polymer; b. a monofunctional monomer; c. a multifunctional monomer; and d. a photoinitiator.

14 . An ink-jettable UV-curable adhesive composition comprising:
a. an acrylic polymer; b. a monofunctional monomer; c. a multifunctional monomer; and d. a photoinitiator.

15 . The adhesive of claim 14 , wherein the composition does not comprise a pigment.

Assignees

• Hp Scitex Ltd

Inventors

• Cohen Eytan
• Trubnikov Alex
• Dayan Benjamin
• Soroker Efrat
• Rubin Shimrit

Classifications

• B32B15/046

  of foam · CPC title

• B32B15/14

  next to a fibrous or filamentary layer · CPC title

• B44C1/1733

  Decalcomanias applied under pressure only, e.g. provided with a pressure sensitive adhesive · CPC title

• B32B27/32

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

• B32B27/36

  comprising polyesters · CPC title