Image forming method and image forming apparatus

Patent metadata

Field	Value
Publication number	US-10851253-B2
Application number	US-201916354834-A
Country	US
Kind code	B2
Filing date	Mar 15, 2019
Priority date	Mar 16, 2018
Publication date	Dec 1, 2020
Grant date	Dec 1, 2020

Abstract

An image forming method includes applying white ink containing hollow resin particulate to a recording medium and contacting a heating roller having a diameter of 200 mm or less with a first surface of the recording medium.

First claim

What is claimed is:

1. An image forming method comprising:
applying white ink containing hollow resin particulate to a recording medium; and
contacting a heating roller having a diameter of 200 mm or less with a first surface of the recording medium, and
contacting the heating roller with a second surface of the recording medium after the heating roller contacts the first surface.

2. The image forming method according to claim 1 , wherein the hollow resin particulate has a 50 percent volume particle diameter (d50) of from 0.4 to 0.6 and a ratio (Y/X) of a maximum intensity Y in 1730 cm −1 ±10 cm −1 to a maximum intensity X in 1600 cm −1 ±10 cm −1 according to infrared spectroscopy of from 3.0 to 6.0.

3. The image forming method according to claim 1 , wherein the recording medium has a basis weight of 70 gsm or less and an application amount of the white ink is 3.0 mg/cm 2 or more in the applying.

4. The image forming method according to claim 1 , wherein the white ink contains a coumarin derivative or a benzoxazole derivative.

5. The image forming method according to claim 1 , wherein the white ink contains an ultraviolet absorbent.

6. The image forming method according to claim 1 ,
wherein the white ink comprises one or more organic solvents, and
wherein a mixing SP value of the one or more organic solvents accounting for 3 percent by mass or more of the white ink is from 12.0 to 15.0 (cal/cm 3 ) 0.5 .

7. The image forming method according to claim 1 ,
wherein the white ink comprises resin particulate comprising at least one of urethane resin particulate and acrylic styrene resin particulate, and
wherein a mixing SP value of the resin particulate accounting for 0.1 percent by mass of the white ink is from 8.0 to 10.0 (cal/cm 3 ) 0.5 .

8. The image forming method according to claim 1 , wherein, in the contacting, the heating roller is in contact with the recording medium over an entire region in a width direction of the recording medium, which is perpendicular to a conveying direction of the recording medium.

9. An image forming method comprising:
applying white ink containing hollow resin particulate to a recording medium; and
contacting a heating roller having a diameter of 200 mm or less with a first surface of the recording medium,
wherein the white ink contains a coumarin derivative or a benzoxazole derivative.

10. An image forming apparatus, comprising:
a white ink containing hollow resin particulate;
a white ink applying device configured to apply the white ink to a recording medium; and
a heating roller having a diameter of 200 mm or less configured to contact a first surface of the recording medium to which the white ink has been applied,
wherein the heating roller is further configured to contact a second. surface of the recording medium after the heating roller contacts the first surface.

11. The image forming apparatus according to claim 10 , wherein the hollow resin particulate has a 50 percent volume particle diameter (d50) of from 0.4 to 0.6 μm and a ratio (Y/X) of a maximum intensity Y in 1730 cm -1 ±10 cm -1 to a maximum intensity X in 1600 cm -1 ± 10 cm -1 according to infrared spectroscopy of from 3.0 to 6.0.

12. The image forming apparatus according to claim 10 , wherein the recording medium has a basis weight of 70 gsm or less and an application amount of the white ink is 3.0 mg/cm 2 or more in the applying.

13. The image forming apparatus according to claim 10 , wherein the white ink contains a coumarin derivative or a benzoxazole derivative.

14. The image forming apparatus according to claim 10 , wherein th white ink contains an ultraviolet absorbent.

15. The image forming apparatus according to claim 10 ,
wherein the white ink comprises one or more organic solvents, and
wherein a mixing SP value of the one or more organic solvents accounting for 3 percent by mass or more of the white ink is from 12.0 to 15.0 (cal/cm 3 ) 0.5 .

16. The image forming apparatus according to claim 10 ,
wherein the white ink comprises resin particulate comprising at least one of urethane resin particulate and acrylic styrene resin particulate, and
wherein a mixing SP value of the resin particulate accounting for 0.1 percent by mass of the white ink is from 8.0 to 10.0 (cal/cm 3 ) 0.5 .

17. The image forming apparatus according to claim 10 , wherein, when the heating roller contacts the recording medium, the heating roller is in contact with the recording medium over an entire region in a width direction of the recording medium, which is perpendicular to a conveying direction of the recording medium.

Assignees

• Maekawa Tsutomu
• Katsuragi Koji
• Tamai Takashi
• Hanazawa Atsufumi
• Jang Dongsik
• Ricoh Co Ltd

Inventors

• Maekawa Tsutomu
• Katsuragi Koji
• Tamai Takashi
• Hanazawa Atsufumi
• Jang Dongsik

Classifications

• B41J11/002 Primary

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

• B41J11/0024

  using conduction means, e.g. by using a heated platen · CPC title

• C09D11/322 Primary

  Pigment inks · CPC title

• B41M5/0023

  Digital printing methods characterised by the inks used (inks per se C09D11/00) · CPC title

• C09D11/106

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