Ink and cleaning liquid set, inkjet printing device, inkjet printing method, and method of cleaning nozzle surface of inkjet discharging head

Patent metadata

Field	Value
Publication number	US-10836171-B2
Application number	US-201916507069-A
Country	US
Kind code	B2
Filing date	Jul 10, 2019
Priority date	Jul 13, 2018
Publication date	Nov 17, 2020
Grant date	Nov 17, 2020

Abstract

An ink and cleaning liquid set includes an ink comprising a coloring material and a resin and a cleaning liquid comprising water and at least one type of organic solvent, wherein the ink in a dried form has a glass transition temperature of from 40 to 90 degrees C. and the swelling ratio calculated from a mass of a film of the ink in a dried form before and after immersion in the cleaning liquid is 10 percent or greater according to the following relationship 1: swelling ratio (percent)=100×[(B−A)/A] Relationship 1, where A represents the mass of the film before the immersion and B represents the mass of the film after the immersion.

First claim

What is claimed is:

1. An ink and cleaning liquid set comprising:
an ink comprising a coloring material and a resin; and
a cleaning liquid comprising water and at least one type of organic solvent,
wherein the ink in a dried form has a glass transition temperature of from 40 to 90 degrees C.,
wherein a swelling ratio calculated from a mass of a film of the ink in a dried form before and after immersion in the cleaning liquid at 25 degrees C. for three minutes is 10 percent or greater according to the following relationship 1:
swelling ratio (percent)=100×[( B−A )/ A ]  Relationship 1

where A represents the mass of the film before the immersion and B represents the mass of the film after the immersion.

2. The ink and cleaning liquid set according to claim 1 , wherein the swelling ratio is 14 percent or greater.

3. The ink and cleaning liquid set according to claim 1 , wherein the resin has a glass transition temperature of 60 degrees C. or higher.

4. The ink and cleaning liquid set according to claim 1 , wherein the at least one type of organic solvent comprises an organic solvent having a hydrogen bond term of 4.5 or less of Hansen solubility parameter (HSP) accounting for 10 percent by mass or more of the at least one type of organic solvent in the cleaning liquid.

5. The ink and cleaning liquid set according to claim 4 , wherein the at least one type of organic solvent further comprises a second organic solvent having a hydrogen bond term of from 5.0 to 6.8 of Hansen solubility parameter (HSP).

6. The ink and cleaning liquid set according to claim 1 , wherein the resin comprises an acrylic resin and the acrylic resin accounts for 3 percent by mass or more of the ink.

7. An inkjet printing device comprising:
the ink and cleaning liquid set of claim 1 ;
an ink flow path;
a recording head configured to discharge the ink in the ink and cleaning liquid set to a recording medium; and
a cleaning device configured to remove the ink remaining on the ink flow path or the recording head with the cleaning liquid in the ink and cleaning liquid set.

8. An inkjet printing method comprising:
discharging the ink in the ink and cleaning liquid set of claim 1 to print on a recording medium; and
removing the ink remaining on an ink flow path or a recording head with the cleaning liquid in the ink and cleaning liquid set.

9. A method of cleaning a nozzle surface of an ink discharging head, comprising:
applying the cleaning liquid in the ink and cleaning liquid set of claim 1 to a wiping member; and
wiping the nozzle surface with the wiping member to which the cleaning liquid has been applied.

10. A method of cleaning a nozzle surface of an ink discharging head comprising:
applying the cleaning liquid in the ink and cleaning liquid set of claim 1 to the nozzle surface of an ink discharging head; and
wiping the nozzle surface to which the cleaning liquid has been applied with a wiping member.

Assignees

• SAGARA Amika
• Yokohama Yuuki
• Kudo Masaki
• Koizuka Yuusuke
• Matsuyama Akihiko
• Oyama Koichiro
• Ricoh Co Ltd

Inventors

• SAGARA Amika
• Yokohama Yuuki
• Kudo Masaki
• Koizuka Yuusuke
• Matsuyama Akihiko
• Oyama Koichiro

Classifications

• C09D11/037

  characterised by the pigment · CPC title

• B41J2/16535 Primary

  using wiping constructions (B41J2/16552 takes precedence) · CPC title

• C09D11/107

  from unsaturated acids or derivatives thereof · CPC title

• C11D3/2044

  linear · CPC title

• C11D3/32

  Amides; Substituted amides · CPC title