Image forming method and image forming apparatus

Patent metadata

Field	Value
Publication number	US-10328722-B2
Application number	US-201815983620-A
Country	US
Kind code	B2
Filing date	May 18, 2018
Priority date	May 23, 2017
Publication date	Jun 25, 2019
Grant date	Jun 25, 2019

Abstract

An image forming method is provided. The method includes the steps of: applying a liquid composition, comprising a pigment, water, a resin, and an organic solvent, to a recording medium having water-absorptivity to form an image thereon; and winding up the recording medium in a roll form after the applying, wherein the following formulae are satisfied:

1.00×10 −3 ≤A≤ 4.00×10 −1

0.010≤ B/A ≤0.100

where B (mg/cm 2 ) represents an amount of the organic solvent contained in the image after the winding and A (mg/cm 2 ) represents a total amount of the organic solvent contained in the image and the recording medium after the winding.

First claim

The invention claimed is:

1. An image forming method comprising:
applying a liquid composition, comprising a pigment, water, a resin, and an organic solvent, to a recording medium having water-absorptivity to form an image thereon; and
winding up the recording medium in a roll form after the applying,
wherein the following formulae are satisfied:
1.00×10 −3 ≤A≤ 4.00×10 −1

0.010≤ B/A≤ 0.100

where B (mg/cm 2 ) represents an amount of the organic solvent contained in the image after the winding and A (mg/cm 2 ) represents a total amount of the organic solvent contained in the image and the recording medium after the winding.

2. The image forming method of claim 1 , wherein, in the winding, a pressure of from 1.00×10 −3 to 1.00×10 kgf/cm 2 is applied to the recording medium.

3. The image forming method of claim 2 , wherein, in the winding, the recording medium has a temperature of from 30° C. to 60° C. under the pressure.

4. The image forming method of claim 1 , wherein in the winding, a pressure of from 5.00×10 −1 to 1.00×10 kgf/cm 2 is applied to the recording medium.

5. The image forming method of claim 1 , wherein a total amount of the pigment and the resin contained in the image per unit area is from 20 to 200 μg/cm 2 .

6. The image forming method of claim 1 , wherein the resin has a glass transition temperature of from 50° C. to 140° C.

7. The image forming method of claim 1 , further comprising:
drying the recording medium by applying heated wind having a temperature of 120° C. or higher to the recording medium after the applying.

8. The image forming method of claim 1 , wherein the liquid composition has a viscosity of from 6.0 to 10.0 mPa·s at 25° C.

9. The image forming method of claim 1 , wherein the following formula is satisfied:
5.0≤η1/η0≤30.0

where η0 represents a viscosity at 25° C. of the liquid composition; and η1 represents a viscosity at 25° C. of the liquid composition evaporated under atmospheric pressure at 50° C. until a mass ratio of the liquid composition after evaporation to the liquid composition before evaporation becomes 60%.

10. The image forming method of claim 1 , wherein the recording medium has a basis weight of from 75 to 190 g/m 2 .

11. The image forming method of claim 1 , wherein the liquid composition further comprises isopropylene glycol.

12. An image forming method comprising:
(a) applying a liquid composition, comprising a pigment, water, a resin, and an organic solvent, to a recording medium having water-absorptivity to form an image thereon; and
(b) applying a pressure of from 1.00×10 −3 to 1.00×10 kgf/cm 2 to the recording medium after the step (a),
wherein the following formulae are satisfied:
1.00×10 −3 ≤A≤ 4.00×10 −1

0.010≤ B/A≤ 0.100

where B (mg/cm 2 ) represents an amount of the organic solvent contained in the image after the step (b) and A (mg/cm 2 ) represents a total amount of the organic solvent contained in the image and the recording medium after the step (b).

13. The image forming method of claim 12 , wherein the step (b) further includes winding up the recording medium to apply the pressure thereto.

14. The image forming method of claim 12 , wherein the step (b) further includes stacking the recording medium to apply a weight of the recording medium as the pressure thereto.

15. The image forming method of claim 12 , wherein the step (b) further includes pressing the recording medium with a pressing roller to apply the pressure thereto.

16. An image forming apparatus comprising:
a storage storing a liquid composition comprising a pigment, water, a resin, and an organic solvent;
a recording medium storage storing a recording medium having water-absorptivity;
an applying device configured to apply the liquid composition to the recording medium to form an image thereon; and
a winder configured to wind up the recording medium having the image thereon,
wherein the following formulae are satisfied:
1.00×10 −3 ≤A≤ 4.00×10 −1

0.010≤ B/A≤ 0.100

where B (mg/cm 2 ) represents an amount of the organic solvent contained in the image on the recording medium wound up by the winder and A (mg/cm 2 ) represents a total amount of the organic solvent contained in the image and the recording medium wound up by the winder.

17. The image forming apparatus of claim 16 , wherein the winder is configured to apply a pressure of from 1.00×10 −3 to 1.00×10 kgf/cm 2 to the recording medium.

Assignees

• Katoh Keita
• Goto Hiroshi
• Nonogaki Masayasu
• Umemura Kazuhiko
• Kudo Masaki
• Ricoh Co Ltd

Inventors

• Katoh Keita
• Gotou Hiroshi
• Nonogaki Masayasu
• Umemura Kazuhiko
• Kudo Masaki

Classifications

• B41M7/00

  After-treatment of prints, e.g. heating, irradiating, {setting of the ink, protection of the printed stock (pre-treatment or treatment during printing B41M5/0011; printers for treating or overcoating copy materials before, during or after printing B41J11/0015)} · CPC title

• B41J11/002 Primary

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

• B41J15/16

  Means for tensioning or winding the web · CPC title

• B41M7/009

  using thermal means, e.g. infrared radiation, heat · CPC title

• B41J11/00216 Primary

  using infrared [IR] radiation or microwaves · CPC title