Liquid discharging apparatus, liquid discharging method, and inkjet printing method

Patent metadata

Field	Value
Publication number	US-11618255-B2
Application number	US-202117406159-A
Country	US
Kind code	B2
Filing date	Aug 19, 2021
Priority date	Sep 18, 2020
Publication date	Apr 4, 2023
Grant date	Apr 4, 2023

Abstract

Provided is a liquid discharging apparatus including a container containing a liquid composition containing water, an organic solvent, and a polyurethane resin, and a discharging head. The discharging head includes: an individual liquid chamber including a circulation flow path through which the liquid composition circulates; and a nozzle communicating with the individual liquid chamber and through which a liquid droplet of the liquid composition is discharged. The solid content of the polyurethane resin in the liquid composition is 7.0% by mass or greater but 20.0% by mass or less.

First claim

The invention claimed is:

1. A liquid discharging apparatus, comprising:
a container containing a liquid composition containing water, an organic solvent, and
a polyurethane resin; and
a discharging head including:
an individual liquid chamber including a circulation flow path through which the liquid composition circulates; and
a nozzle through which a liquid droplet of the liquid composition is discharged, the nozzle communicating with the individual liquid chamber,

wherein a solid content of the polyurethane resin in the liquid composition is 7% by mass or greater but 20.0% by mass or less,
wherein the polyurethane resin comprises both a polycarbonate polyurethane resin and polyester polyurethane resin, and
wherein a glass transition temperature of the polycarbonate polyurethane resin is −10 degrees C. or lower but −30 degrees C. or higher, and a glass transition temperature of the polyester polyurethane resins is 50 degrees C. or higher but 60 degrees C. or lower.

2. The liquid discharging apparatus according to claim 1 ,
wherein the discharging head further includes:
a pressure sensor configured to detect a pressure of the liquid composition; and
a circulation speed control unit configured to control a circulation speed of the liquid composition to adjust the pressure of the liquid composition to a target pressure.

3. The liquid discharging apparatus according to claim 2 ,
wherein the circulation speed control unit controls the circulation speed of the liquid composition to be higher when a detected value of the pressure sensor is lower than the target pressure.

4. The liquid discharging apparatus according to claim 1 , wherein the solid content of the polyurethane resin in the liquid composition is 7.2% by mass or greater but 15% by mass or less.

5. The liquid discharging apparatus according to claim 1 , wherein the proportion of water in the liquid composition is 20 to 60% by mass of the liquid composition.

6. The liquid discharging apparatus according to claim 1 , wherein the solvent comprises 1,2-propanediol; 3-methoxy-3-methyl-1-butanol; 2,3,-butanediol, or 2,ethythexyl alcohol.

7. A liquid discharging method, comprising
circulating a liquid composition in an individual liquid chamber and discharging a liquid droplet of the liquid composition through a nozzle of a discharging head,
wherein the liquid composition contains water, an organic solvent, and a polyurethane resin, and
a solid content of the polyurethane resin in the liquid composition is 7% by mass or greater but 20.0% by mass or less,
wherein the polyurethane resin comprises both a polycarbonate polyurethane resin and polyester polyurethane resin, and
wherein a glass transition temperature of the polycarbonate polyurethane resin is −10 degrees C. or lower but −30 degrees C. or higher, and a glass transition temperature of the polyester polyurethane resins is 50 degrees C. or higher but 60 degrees C. or lower.

8. The method according to claim 7 , wherein the solid content of the polyurethane resin in the liquid composition is 7.2% by mass or greater but 15% by mass or less.

9. The method according to claim 7 , wherein the proportion of water in the liquid composition is 20 to 60% by mass of the liquid composition.

10. The method according to claim 7 , wherein the solvent comprises 1,2-propanediol; 3-methoxy-3-methyl-1-butanol; 2,3,-butnediol; or 2,ethylhexyl alcohol.

11. An inkjet printing method, comprising:
circulating an ink in an individual liquid chamberchaaber and discharging a liquid droplet of the ink through a nozzle of a discharging head,
wherein the ink contains water, an organic solvent, and a polyurethane resin, and
a solid content of the polyurethane resin in the ink is 7% by mass or greater but 20.0% by mass or less,
wherein the polyurethane resin comprises both a polycarbonate polyurethane resin and polyester polyurethane resin, and
wherein a glass transition temperature of the polycarbonate polyurethane resin is −10 degrees C. or lower but −30 degrees C. or higher, and a glass transition temperature of the polyester polyurethane resins is 50 degrees C. or higher but 60 degrees C. or lower.

12. The method according to claim 11 , wherein the solid content of the polyurethane resin in the liquid composition is 72% by mass or greater but 15% by mass or less.

13. The method according to claim 11 , wherein the proportion of water in the liquid composition is 20 to 60% by mass of the liquid composition.

14. The method according to claim 11 , wherein the solvent comprises 1,2-propanediol; 3-methoxy-3-methyl-1-butanol, 2,3,-butanediol, or 2,ethylhexyl alcohol.

Assignees

• Shimizu Takayuki
• Ricoh Co Ltd

Inventors

• Shimizu Takayuki

Classifications

• C09D11/102

  containing macromolecular compounds obtained by reactions other than those only involving unsaturated carbon-to-carbon bonds · CPC title

• C09D11/322

  Pigment inks · CPC title

• B41J2002/14419

  Manifold · CPC title

• B41J2/18

  Ink recirculation systems · CPC title

• B41J2/14201 Primary

  Structure of print heads with piezoelectric elements · CPC title