Method of forming a varnish-coated image

Patent metadata

Field	Value
Publication number	US-2025073749-A1
Application number	US-202418952459-A
Country	US
Kind code	A1
Filing date	Nov 19, 2024
Priority date	Jun 2, 2022
Publication date	Mar 6, 2025
Grant date	—

Abstract

A printing method includes forming an image by applying marking material onto the surface of a substrate; subjecting the image to a fixation treatment; and applying a layer of an ionically stabilized varnish on the surface of the image. When the image has been formed, a layer of liquid solvent is formed on at least a part of the surface of the image, thereby causing ions to migrate from the marking material into the solvent and then to be absorbed into the substrate together with a part of the solvent before the varnish s applied.

First claim

1 . A printing method comprising the steps of:
forming an image by applying marking material onto the surface of a substrate; subjecting the image to a fixation treatment; and applying a layer of an ionically stabilized varnish on the surface of the image, wherein, when the image has been formed, a layer of liquid solvent is formed on at least a part of the surface of the image, thereby causing ions to migrate from the marking material into the solvent and then to be absorbed into the substrate together with a part of the solvent before the varnish is applied.

2 . The method according to claim 1 , wherein the varnish is an anionically stabilized varnish.

3 . The method according to claim 1 , wherein a pre-treatment liquid is applied onto the surface of the substrate before the marking material is applied.

4 . The method according to claim 2 , wherein the pre-treatment liquid contains at least one salt that has divalent cations.

5 . The method according to claim 1 , wherein the varnish is a water-based varnish.

6 . The method according to claim 1 , wherein the solvent is water.

7 . The method according to claim 6 , wherein the fixation treatment comprises exposing the surface of the printed image to an atmosphere that contains water vapor.

8 . The method according to claim 7 , wherein the fixation treatment comprises a step of blowing hot gas against the surface of the printed image, at least a portion of the hot gas being constituted by super-heated steam.

9 . The method according to claim 1 , wherein an anilox roller is used for applying the varnish on the surface of the image.

10 . A printing system comprising a primer application unit, a print engine, a fixation unit and a varnish applicator disposed in that order along a transport path for print substrates, wherein the fixation unit is configured for blowing super-heated steam against the surface of the substrates.

11 . The method according to claim 2 , wherein a pre-treatment liquid is applied onto the surface of the substrate before the marking material is applied.

12 . The method according to claim 3 , wherein the pre-treatment liquid contains at least one salt that has divalent cations.

13 . The method according to claim 2 , wherein the varnish is a water-based varnish.

14 . The method according to claim 3 , wherein the varnish is a water-based varnish.

15 . The method according to claim 4 , wherein the varnish is a water-based varnish.

16 . The method according to claim 2 , wherein the solvent is water.

17 . The method according to claim 3 , wherein the solvent is water.

18 . The method according to claim 4 , wherein the solvent is water.

19 . The method according to claim 5 , wherein the solvent is water.

20 . The method according to claim 2 , wherein an anilox roller is used for applying the varnish on the surface of the image.

Assignees

• Canon Production Printing Holding Bv

Inventors

• Schell Jeroen A

Classifications

• B05D7/544

  the first layer is let to dry at least partially before applying the second layer · CPC title

• B05D7/51

  One specific pretreatment, e.g. phosphatation, chromatation, in combination with one specific coating (pretreatment of metallic substrates C23C; pretreatment before coating in general B05D3/00) · CPC title

• B41J11/0015

  for treating before, during or after printing or for uniform coating or laminating the copy material before or after printing (selective coating B41J2/2114) · CPC title

• B41M7/009

  using thermal means, e.g. infrared radiation, heat · CPC title

• B41M7/02

  Dusting {, e.g. with an anti-offset powder for obtaining raised printing such as by thermogravure (B41M7/0027, B41M7/0036, B41M7/0045, B41M7/0054, B41M7/0072, B41M7/0081, B41M7/009 take precedence); Varnishing (devices for treating the surfaces of sheets, webs, or other articles in connection with printing B41F23/00, B41L23/00)} · CPC title