Ink jet recording method

Patent metadata

Field	Value
Publication number	US-9914843-B2
Application number	US-201715640205-A
Country	US
Kind code	B2
Filing date	Jun 30, 2017
Priority date	Feb 22, 2012
Publication date	Mar 13, 2018
Grant date	Mar 13, 2018

Abstract

An ink jetting ink set includes an ink composition for recording supplied to and used in an ink flow path and containing at least one of a glitter pigment and a metal oxide as a coloring material, and an auxiliary ink composition used in cleaning of the ink flow path, in which, in cases where a dynamic viscosity at 20° C. in the ink composition for recording is η 1 (mm 2 /s) and a surface tension at 20° C. is γ 1 (mN/m), and the dynamic viscosity at 20° C. in the auxiliary ink composition is η 2 (mm 2 /s) and the surface tension at 20° C. is γ 2 (mN/m), the following formula (1) and the following formula (2) are satisfied at the same time.

η 1 ≦η 2   (1)

γ 1 ≧γ 2   (2)

First claim

What is claimed is:

1. An ink jet recording method, comprising:
ejecting an ink composition for recording from a nozzle of a head; and
replacing the ink composition for recording with an auxiliary ink composition used for cleaning,
wherein the ink composition contains at least one of a glitter pigment and a metal oxide as a coloring material,
wherein the auxiliary ink composition contains an alkyl polyol having a content of 20 mass % to 50 mass % with respect to the total mass of the auxiliary ink composition, and
wherein, in cases where a dynamic viscosity at 20° C. in the ink composition for recording is η 1 (mm 2 /s) and a surface tension at 20° C. is γ 1 (mN/m), and the dynamic viscosity at 20° C. in the auxiliary ink composition is η 2 (mm 2 /s) and the surface tension at 20° C. is γ 2 (mN/m), the following formula (1) and the following formula (2) are satisfied at the same time:
η 1 ≦η 2   (1)

γ 1 ≧γ 2   (2).

2. The ink jet recording method according to claim 1 ,
wherein η 2 is 3 (mm 2 /s) to 10 (mm 2 /s), and γ 2 is 15 (mN/m) to 35 (mN/m).

3. The ink jet recording method according to claim 1 ,
wherein the auxiliary ink composition contains a surfactant having an anti-foaming property.

4. The ink jet recording method according to claim 1 ,
wherein the ink composition for recording contains a kind of alkyl polyol with a normal boiling point of 180° C. to 250° C. without substantially containing a kind of alkyl polyol with a normal boiling point of 280° C. or more, and
the alkyl polyol in the auxiliary ink composition has a normal boiling point of 180° C. to 250° C.

5. The ink jet recording method according to claim 1 ,
wherein the auxiliary ink composition contains a coloring material having content of 0.5 mass % or less relative to the mass of the auxiliary ink composition.

6. The ink jet recording method according to claim 1 ,
wherein a freezing temperature of the auxiliary ink composition at a pressure of one atmosphere is −15° C. or less.

7. An ink jet recording apparatus, comprising:
an ink composition for recording;
an auxiliary ink composition used for cleaning;
a head having a nozzle for ejecting the ink composition for recording; and
a suction pump to discharge the ink composition for recording from the nozzle and replace the ink composition for recording with the auxiliary ink composition,
wherein the ink composition contains at least one of a glitter pigment and a metal oxide as a coloring material,
wherein the auxiliary ink composition contains an alkyl polyol having a content of 20 mass % to 50 mass % with respect to the total mass of the auxiliary ink composition, and
wherein, in cases where a dynamic viscosity at 20° C. in the ink composition for recording is η 1 (mm 2 /s) and a surface tension at 20° C. is γ 1 (mN/m), and the dynamic viscosity at 20° C. in the auxiliary ink composition is η 2 (mm 2 /s) and the surface tension at 20° C. is γ 2 (mN/m), the following formula (1) and the following formula (2) are satisfied at the same time:
η 1 ≦η 2   (1)

γ 1 ≧γ 2   (2).

8. The ink jet recording apparatus according to claim 7 ,
wherein η 2 is 3 (mm 2 /s) to 10 (mm 2 /s), and γ 2 is 15 (mN/m) to 35 (mN/m).

9. The ink jet recording apparatus according to claim 7 ,
wherein the auxiliary ink composition contains a surfactant having an anti-foaming property.

10. The ink jet recording apparatus according to claim 7 ,
wherein the ink composition for recording contains a kind of alkyl polyol with a normal boiling point of 180° C. to 250° C. without substantially containing a kind of alkyl polyol with a normal boiling point of 280° C. or more, and
the alkyl polyol in the auxiliary ink composition has a normal boiling point of 180° C. to 250° C.

11. The ink jet recording apparatus according to claim 7 ,
wherein the auxiliary ink composition contains a coloring material having content of 0.5 mass % or less relative to the mass of the auxiliary ink composition.

12. The ink jet recording apparatus according to claim 7 ,
wherein a freezing temperature of the auxiliary ink composition at a pressure of one atmosphere is −15° C. or less.

Assignees

• Seiko Epson Corp

Inventors

• Ohta Hitoshi

Classifications

• B08B9/027

  Cleaning the internal surfaces; Removal of blockages · CPC title

• C09D11/322

  Pigment inks · CPC title

• B41J2/1707 Primary

  Conditioning of the inside of ink supply circuits, e.g. flushing during start-up or shut-down · CPC title

• C09D11/40

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

• C09D11/30 Primary

  Inkjet printing inks · CPC title