Ink jet recording method and ink jet recording apparatus
The ink jet recording method includes ejecting an aqueous ink from a recording head to apply the aqueous ink to a recording medium, to thereby record an image. The ink jet recording method includes: ejecting the aqueous ink heated to a temperature T H (° C.) from the recording head to apply the aqueous ink to the recording medium; and heating the recording medium having the aqueous ink applied thereto to a temperature T F (° C.), the aqueous ink containing a pigment and a polyester resin particle, a glass transition temperature T G (° C.) of the polyester resin particle, the temperature T H (° C.) and the temperature T F (° C.) satisfying relationships of the following expressions (1) to (3). T G (° C.)> T H (° C.) (1) T F (° C.)≥ T H (° C.)+10° C. (2) T F (° C.)≥ T G (° C.)−10° C. (3)
1. An ink jet recording method including ejecting an aqueous ink from a recording head of an ink jet system through action of thermal energy to apply the aqueous ink to a recording medium, to thereby record an image,
the ink jet recording method comprising:
ejecting the aqueous ink heated to a temperature T H (° C.) from the recording head to apply the aqueous ink to the recording medium; and
heating the recording medium having the aqueous ink applied thereto to a temperature T F (° C.),
the aqueous ink containing a pigment and a polyester resin particle,
the polyester resin particle having a ratio of a weight average molecular weight to a number average molecular weight of 6.0 or less,
a glass transition temperature T G (° C.) of the polyester resin particle, the temperature T H (° C.) and the temperature T F (° C.) satisfying relationships of the following expressions (1) to (3),
a heat quantity ((W·h)/g) to be applied to the aqueous ink applied to the recording medium being 2 (W·h)/g or more,
the recording medium having a water absorption amount of 10 mL/m 2 or less in a Bristow method from start of contact to 30 msec 1/2 .
T G (° C.)> T H (° C.) (1)
T F (° C.)≥ T H (° C.)+10° C. (2)
T F (° C.)≥ T G (° C.)−10° C. (3)
2. The ink jet recording method according to claim 1 ,
wherein the temperature T H (° C.) is 40° C. or more, and
wherein the temperature T F (° C.) is 90° C. or less.
3. The ink jet recording method according to claim 1 ,
wherein the aqueous ink further contains a first water-soluble organic solvent having a boiling point of from 120° C. or more to 220° C. or less, and
wherein the first water-soluble organic solvent has a largest content by mass) among all water-soluble organic solvents in the aqueous ink.
4. The ink jet recording method according to claim 3 ,
wherein a difference between an SP value of the first water-soluble organic solvent and an SP value of the polyester resin particle is 4.0 or less, and
wherein the content (% by mass) of the first water-soluble organic solvent in the aqueous ink is from 1.0 times or more to 4.0 times or less in terms of mass ratio with respect to a content (% by mass) of the polyester resin particle.
5. The ink jet recording method according to claim 1 ,
wherein the aqueous ink further contains a second water-soluble organic solvent having a boiling point of from more than 220° C. to 310° C. or less, and
wherein a difference between an SP value of the second water-soluble organic solvent and an SP value of the polyester resin particle is 4.0 or less.
6. The ink jet recording method according to claim 1 ,
wherein the pigment is dispersed in the aqueous ink through action of an anionic group, and
wherein an anionic group amount (μmol/g) of the pigment is 6.0 times or more in terms of ratio with respect to an anionic group amount (μmol/g) of the polyester resin particle.
7. The ink jet recording method according to claim 1 , wherein the weight average molecular weight of the polyester resin particle is from 30,000 or more to 70,000 or less.
8. The ink jet recording method according to claim 1 , wherein a content (% by mass) of the polyester resin particle in the aqueous ink is 1.5 times or more in terms of mass ratio with respect to a content (% by mass) of the pigment.
9. The ink jet recording method according to claim 1 ,
wherein the aqueous ink further contains a wax particle formed of at least one kind of wax selected from the group consisting of: a Fischer-Tropsch wax; a polyolefin wax; and an α-olefin/maleic anhydride copolymer, and
wherein a content (% by mass) of the polyester resin particle in the aqueous ink is from 2.0 times or more to 30.0 times or less in terms of mass ratio with respect to a content (% by mass) of the wax particle.
10. An ink jet recording apparatus to be used in an ink jet recording method including ejecting an aqueous ink from a recording head of an ink jet system through action of thermal energy to apply the aqueous ink to a recording medium, to thereby record an image,
the ink jet recording apparatus comprising:
a mechanism configured to heat the aqueous ink to be ejected from the recording head and applied to the recording medium to a temperature T H (° C.); and
a mechanism configured to heat the recording medium having the aqueous ink applied thereto to a temperature T F (° C.),
the aqueous ink containing a pigment and a polyester resin particle,
the polyester resin particle having a ratio of a weight average molecular weight to a number average molecular weight of 6.0 or less,
a glass transition temperature T G (° C.) of the polyester resin particle, the temperature T H (° C.) and the temperature T F (° C.) satisfying relationships of the following expressions (1) to (3),
a heat quantity (W·h)/g) to be applied to the aqueous ink applied to the recording medium being 2 (W·h)/g or more,
the recording medium having a water absorption amount of 10 mL/m 2 or less in a Bristow method from start of contact to 30 msec 1/2 .
T G (° C.)> T H (° C.) (1)
T F (° C.)≥ T H (° C.)+10° C. (2)
T F (° C.)≥ T G (° C.)−10° C. (3)