Ink jet recording method and ink jet recording apparatus

1. An ink jet recording method which prints out by ejecting onto a recording medium an ink set for ink jet use, wherein:

the ink set comprises a first liquid comprising a colorant, a water soluble solvent and water; and a second liquid comprising a coagulating agent, a water soluble solvent and water;

recording in a double sided print mode and recording in a single sided print mode are possible;

and the relationship of the following Expression (1) is satisfied in both modes:

0.01

<

RD

2

×

RM

1

RD

1

×

RM

2

<

1

Expression

⁢

⁢

(

1

)

wherein RD 1 is an application amount per unit area of the first liquid for the double sided printing mode; RD 2 is an application amount per unit area of the second liquid for the double sided printing mode; RM 1 is an application amount per unit area of the first liquid for the single sided printing mode; and RM 2 is an application amount per unit area of the second liquid for the single sided printing mode.

2. The ink jet recording method according to claim 1 , wherein, for recording by printing of the same color, the relationship of the following expression is satisfied:

0.01<RD 1 /RM 1 <1  Expression (2).

3. The ink jet recording method according to claim 1 , wherein control so that Expression (1) is satisfied includes adjusting at least one of the group consisting of a number of pixels applied by the first liquid and a number of pixels applied by the second liquid.

4. The ink jet recording method according to claim 1 , wherein control so that Expression (1) is satisfied includes adjusting at least one of the group consisting of an amount of the first liquid applied per pixel and of an amount of the second liquid applied per pixel.

5. The ink jet recording method according to claim 4 , wherein the adjusting at least one of the group consisting of the amount of the first liquid applied per pixel and of the amount of the second liquid applied per pixel includes changing the amount of the liquid, the amount of which is adjusted, by altering a wave form of a voltage applied to the liquid, the amount of which is adjusted.

6. The ink jet recording method according to claim 1 , wherein the amounts of the first liquid and the second liquid applied per pixel are each in a range of about 0.01 to 25 ng.

7. The ink jet recording method according to claim 1 , wherein, in the single sided printing mode, the ratio by mass of the amount of the first liquid per pixel to the second liquid applied per pixel is in a range of about 100:5 to 100:100; and, in the double sided printing mode, the ratio by mass of the amount of the first liquid per pixel to the second liquid applied per pixel is in a range of about 100:1 to 100:50.

8. The ink jet recording method according to claim 1 , wherein the first liquid comprises a high-molecular substance.

9. The ink jet recording method according to claim 8 , wherein an acid value of the high-molecular substance is in a range of about 30 to 150 KOH mg/g.

10. The ink jet recording method according to claim 8 , wherein the acid value of the high-molecular substance is in a range of about 150 to 1000 KOH mg/g, and a degree of neutralization of the high-molecular substance is 20% to 80%.

11. The ink jet recording method according to claim 1 , wherein the colorant is a pigment, and the pigment is at least one selected from the group consisting of a pigment that is dispersed by using a polymer dispersing agent, a self-dispersible pigment dispersible in water, a resin-coated pigment, and a polymer graft pigment.

12. The ink jet recording method according to claim 1 , wherein a volume average particle diameter of the colorant is in a range of about 30 to 250 nm.

13. The ink jet recording method according to claim 1 , wherein a surface tension of the first liquid is in a range of about 20 to 60 mN/m.

14. An ink jet recording apparatus which is provided with a recording head which ejects onto a recording medium an ink set for ink jet use, wherein:

the ink set comprises a first liquid comprising a colorant, a water soluble solvent and water; and a second liquid comprising a coagulating agent, a water soluble solvent and water;

recording in a double sided print mode and recording in a single sided print mode are possible;

and the relationship of the following Expression (1) is satisfied in both modes:

0.01

<

RD

2

×

RM

1

RD

1

×

RM

2

<

1

Expression

⁢

⁢

(

1

)

wherein RD 1 is an application amount per unit area of the first liquid for the double sided printing mode; RD 2 is an application amount per unit area of the second liquid for the double sided printing mode; RM 1 is an application amount per unit area of the first liquid for the single sided printing mode; and RM 2 is an application amount per unit area of the second liquid for the single sided printing mode.

15. The ink jet recording apparatus according to claim 14 , wherein, for recording by printing of the same color, the relationship of the following expression is satisfied:

0.01<RD 1 /RM 1 <1  Expression (2).

16. The ink jet recording apparatus according to claim 14 , wherein a device which conducts control so that Expression (1) is satisfied by adjusting at least one of the group consisting of a number of pixels applied by the first liquid and a number of pixels applied by the second liquid is further provided therewith.

17. The ink jet recording apparatus according to claim 14 , wherein a device which conducts control so that Expression (1) is satisfied by adjusting at least one of the group consisting of an amount of the first liquid applied per pixel and of an amount of the second liquid applied per pixel is further provided therewith.

18. The ink jet recording apparatus according to claim 17 , wherein a device which conducts the adjusting at least one of the group consisting of the amount of the first liquid applied per pixel and of the amount of the second liquid applied per pixel by changing the amount of the liquid, the amount of which is adjusted, by altering a wave form of a voltage applied to the liquid, the amount of which is adjusted is further provided therewith.

19. The ink jet recording apparatus according to claim 14 , wherein the amounts of the first liquid and the second liquid applied per pixel are each in a range of about 0.01 to 25 ng.

20. The ink jet recording apparatus according to claim 14 , wherein, in the single sided printing mode, the ratio by mass of the amount of the first liquid per pixel to the second liquid applied per pixel is in a range of about 100:5 to 100:100; and, in the double sided printing mode, the ratio by mass of the amount of the first liquid per pixel to the second liquid applied per pixel is in a range of about 100:1 to 100:50.