Method of printing including applying a processing fluid and white ink to a substrate and device for such printing

Patent metadata

Field	Value
Publication number	US-11548294-B2
Application number	US-202117497966-A
Country	US
Kind code	B2
Filing date	Oct 10, 2021
Priority date	Oct 20, 2020
Publication date	Jan 10, 2023
Grant date	Jan 10, 2023

Abstract

A method of printing includes applying a processing fluid to a substrate and inkjet discharging a white ink to the substrate onto which the processing fluid has been applied, wherein the processing fluid contains a tri-valent metal salt, a nonionic urethane resin, and water and the white ink contains a white pigment, a resin, and water.

First claim

The invention claimed is:

1. A method of printing comprising:
applying an aqueous processing fluid to a substrate; and
inkjet discharging an aqueous white ink onto the substrate to which the processing fluid has been applied;
wherein the processing fluid comprises a tri-valent metal salt, a nonionic urethane resin, and water, wherein the processing fluid contains from 10.0 to 90.0 percent by mass of water, and
wherein the white ink comprises a white pigment, a resin, and water.

2. The method according to claim 1 ,
wherein the tri-valent metal salt comprises an aluminum salt.

3. The method according to claim 1 ,
wherein a proportion of the tri-valent metal salt to the processing fluid is from 1.0 percent by mass or more.

4. The method according to claim 1 ,
wherein, in the applying, an amount of the processing fluid applied to the substrate is from 7.5 to 15.0 mL/m 2 .

5. The method according to claim 1 , wherein a temperature of the substrate in the inkjet discharging is from 40 to 70 degrees C.

6. The method according to claim 1 , further comprising:
drying the substrate onto which the white ink has been discharged with heat,
wherein a temperature of the substrate in the drying is from 70 to 95 degrees C.

7. The method according to claim 1 , wherein a proportion of the water in the white ink is from 40.0 to 90.0 percent by mass.

8. The method according to claim 1 ,
wherein both an applying device of the processing fluid in the applying and a discharging device of the white ink in the inkjet discharging are inkjet line heads.

9. The method according to claim 1 ,
wherein the substrate comprises a liquid absorptive medium.

10. The method according to claim 1 ,
wherein the substrate comprises colored kraft paper or corrugated board each having a luminosity (L*) of 50 or less.

11. The method according to claim 1 , wherein the processing fluid contains from 40.0 to 90.0 percent by mass of water.

12. The method according to claim 1 , wherein the processing fluid is free of organic solvent.

13. The method according to claim 1 , wherein the processing fluid contains 3.0 to 30.0 percent by mass of organic solvent.

14. The method according to claim 1 , wherein the processing fluid contains 5.0 to 20.0 percent by mass of organic solvent.

15. The method according to claim 14 , wherein the metal salt is aluminum nitrate, aluminum sulfate, or iron MD chloride hexahydrate, and the organic solvent is 1,2-propane diol or 1,2-butane diol.

16. A device for printing comprising:
an applying device configured to apply an aqueous a processing fluid to a substrate; and
an inkjet discharging printing device configured to inkjet discharge an aqueous white ink to the substrate onto which the processing fluid has been applied;
wherein the processing fluid comprises a tri-valent metal salt, a nonionic urethane resin, and water, wherein the processing fluid contains from 10.0 to 90.0 percent by mass of water, and
wherein the white ink comprises a white pigment, a resin, and water.

17. The device according to claim 16 ,
wherein the inkjet discharging printing device is configured to inkjet discharge the white ink to the substrate being heated by a heating device.

18. The device according to claim 17 ,
wherein a temperature of the heating device is from 40 to 70 degrees C.

19. The device according to claim 16 , further comprising:
a drying device configured to heat the substrate onto which the white ink has been discharged.

20. The device according to claim 19 , wherein a temperature of the drying device is from 70 to 95 degrees C.

Assignees

• Saiga Takuya
• Yamamoto Sei
• Umemura Kazuhiko
• Hirokawa Yuya
• Hagiwara Hiroki
• Ricoh Co Ltd

Inventors

• Saiga Takuya
• Yamamoto Sei
• Umemura Kazuhiko
• Hirokawa Yuya
• Hagiwara Hiroki

Classifications

• B41M5/0017

  Application of ink-fixing material, e.g. mordant, precipitating agent, on the substrate prior to printing, e.g. by ink-jet printing, coating or spraying · CPC title

• B41J2202/21

  Line printing · CPC title

• B41J11/002 Primary

  Curing or drying the ink on the copy materials, e.g. by heating or irradiating · CPC title

• B41J11/0015 Primary

  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

• B41J2/2117

  Ejecting white liquids · CPC title