Ink jet recording method and ink jet recording apparatus
Provided is an ink jet recording method by which the decrease of degassing efficiency is suppressed even after images are recorded for a long period of time in a case where the degassing is performed while circulating an ink in an ink circulation system. An ink jet recording method recording an image on a recording medium by ejecting an ink from a recording head by using an ink jet recording apparatus equipped with an ink storage portion for storing the ink, the recording head for ejecting the ink, a unit for circulating the ink in an ink circulation system arranged between the ink storage portion and the recording head and a unit for degassing the ink circulating in the ink circulation system, the ink being an aqueous ink containing a pigment dispersed by an action of an anionic group, a resin particle and a specific water-soluble organic solvent.
1. An ink jet recording method of recording an image on a recording medium by ejecting an ink from a recording head by using an ink jet recording apparatus equipped with (i) an ink storage portion for storing the ink, (ii) the recording head for ejecting the ink, (iii) a unit for circulating the ink in an ink circulation system arranged between the ink storage portion and the recording head, and (iv) a unit for degassing the ink circulating in the ink circulation system,
wherein the ink is an aqueous ink containing a pigment dispersed by an action of an anionic group, a resin particle, and a water-soluble organic solvent,
wherein the water-soluble organic solvent comprises a first water-soluble organic solvent having a relative dielectric constant of 34.0 or less, and
wherein the resin particle is a cross-linked resin particle that does not include any coloring materials.
2. The ink jet recording method according to claim 1 , wherein a content (% by mass) of the resin particle in the ink is 0.10 times or more in terms of mass ratio relative to a content (% by mass) of the pigment.
3. The ink jet recording method according to claim 1 , wherein a content (% by mass) of the first water-soluble organic solvent (% by mass) in the ink is 0.10 times or more in terms of mass ratio relative to a content (% by mass) of the pigment.
4. The ink jet recording method according to claim 1 , wherein the first water-soluble organic solvent comprises a water-soluble organic solvent having a relative dielectric constant of 27.0 or less.
5. The ink jet recording method according to claim 1 , wherein a surface charge amount (μmol/g) of the resin particle is 160 μmol/g or less.
6. The ink jet recording method according to claim 1 , wherein a content (ppm) of a calcium ion in the ink is 120 ppm or less.
7. The ink jet recording method according to claim 1 , wherein the recording head is a line-type recording head.
8. An ink jet recording apparatus comprising:
(a) an ink storage portion for storing an ink;
(b) a recording head for ejecting the ink;
(c) a unit for circulating the ink in an ink circulation system arranged between the ink storage portion and the recording head; and
(d) a unit for degassing the ink circulating in the ink circulation system,
wherein the ink is an aqueous ink containing a pigment dispersed by an action of an anionic group, a resin particle, and a water-soluble organic solvent,
wherein the water-soluble organic solvent comprises a first water-soluble organic solvent having a relative dielectric constant of 34.0 or less, and
wherein the resin particle is a cross-linked resin particle that does not include any coloring materials.
9. The ink jet recording method according to claim 1 , wherein the pigment dispersed by an action of an anionic group comprises a pigment that is dispersed by a water-soluble resin that has the anionic group.
10. The ink jet recording method according to claim 1 , wherein the pigment dispersed by an action of an anionic group comprises a pigment that has the anionic group bonded to a particle surface of the pigment directly or through another atomic group.
11. The ink jet recording method according to claim 1 , wherein a content (% by mass) of the pigment in the ink is 0.5% by mass or more to 15.0% by mass or less with respect to the total mass of the ink.
12. The ink jet recording method according to claim 1 , wherein a content (% by mass) of the resin particle in the ink is 0.10% by mass or more to 20.00% by mass or less with respect to the total mass of the ink.
13. The ink jet recording method according to claim 1 , wherein a content (% by mass) of the first water-soluble organic solvent in the ink is 0.10% by mass or more to 20.00% by mass or less with respect to the total mass of the ink.
14. The ink jet recording method according to claim 1 , wherein a flow speed of ink circulation in the ink circulation system is set to be 1 to 50 mL/min.
15. The ink jet recording method according to claim 1 , wherein a flow speed of ink circulation in the ink circulation system is set to be 1 to 10 mL/min.
16. The ink jet recording method according to claim 1 , wherein the unit for degassing comprises a depressurizing unit of the ink storage portion.
17. The ink jet recording method according to claim 1 , wherein the unit for degassing comprises a hollow fiber degassing unit.