Ink jet recording method

Patent metadata

Field	Value
Publication number	US-10618308-B2
Application number	US-201716076867-A
Country	US
Kind code	B2
Filing date	Feb 2, 2017
Priority date	Feb 12, 2016
Publication date	Apr 14, 2020
Grant date	Apr 14, 2020

Abstract

The present invention relates to an ink-jet printing method that is capable of obtaining good printed materials that are free of occurrence of color migration and deformation of a printing medium even when printed on a transparent resin printing medium using a water-based ink containing a white ink, and a black or chromatic ink. The present invention provides an ink-jet printing method including the step of ejecting a water-based ink onto a printing medium using a printing apparatus to print characters or images on the printing medium, said printing apparatus including an ink-jet printing head that ejects the water-based ink onto the printing medium that is transported in a feeding direction thereof; and an drying mechanism that is disposed on a downstream side in a feeding direction of the printing medium, in which the printing medium is in the form of a transparent resin printing medium, and the water-based ink includes a white ink, and a black or chromatic ink, and in which the drying mechanism blows a superheated steam that is heated to a temperature of 100 to 180° C. onto at least one of a printing surface and an opposite surface of the printing medium.

First claim

The invention claimed is:

1. An ink-jet printing method comprising the step of ejecting a water-based ink onto a printing medium using a printing apparatus to print characters or images on the printing medium, said printing apparatus comprising an ink-jet printing head that ejects the water-based ink onto the printing medium that is transported in a feeding direction thereof; and a drying mechanism that is disposed on a downstream side in a feeding direction of the printing medium,
in which the printing medium is in the form of a transparent resin printing medium, and a temperature of a surface of the printing medium upon printing is in the range 35° C. through 75° C., and
the water-based ink comprises a white ink, and a black or chromatic ink, and
in which a superheated steam injection nozzle is disposed such that a tip end thereof is spaced at a distance 10 mm through 300 mm apart from the surface of the printing medium, and the drying mechanism blows a superheated steam that is heated to a temperature of not lower than 100° C. and not higher than 148° C. against at least one of a printing surface and an opposite surface of the printing medium.

2. The ink-jet printing method according to claim 1 , wherein a content of an organic solvent having a boiling point of not lower than 90° C. and lower than 250° C. in the black or chromatic water-based ink is not less than 15% by mass and not more than 35% by mass.

3. The ink-jet printing method according to claim 1 , wherein the printing medium is a polyester film that is subjected to corona discharge treatment, or a stretched polypropylene film.

4. The ink-jet printing method according to claim 1 , wherein a thickness of the printing medium is not less than 1 μm and not more than 100 μm.

5. The ink-jet printing method according to claim 1 , wherein a temperature of the ink-jet printing head is not lower than 20° C. and not higher than 45° C.

6. The ink-jet printing method according to claim 1 , wherein an amount of droplets of the water-based ink ejected is not more than 20 pL.

7. The ink-jet printing method according to claim 1 , wherein a printing speed in terms of a transportation speed of the printing medium is not less than 20 m/min.

Assignees

• Kao Corp
• Think Labs Kk

Inventors

• Matsumoto Yuta
• Watanabe Kazuki
• Ueda Yasufumi
• Shigeta Tatsuo

Classifications

• B41M5/0064

  on plastics, horn, rubber, or other organic polymers · CPC title

• C09D11/40

  Ink-sets specially adapted for multi-colour inkjet printing · CPC title

• B41M5/50

  Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording {(printing on organic plastics using a printer's form B41M1/30; printing on pre-treated paper with a printer's form B41M1/36)} · CPC title

• B41M5/0047

  by ink-jet printing · CPC title

• B41M5/0023

  Digital printing methods characterised by the inks used (inks per se C09D11/00) · CPC title