Preprocessing liquid for textile printing, ink set for ink jet textile printing, ink jet textile printing method

1. Preprocessing liquid for textile printing comprising:

a polyvalent metal compound;

resin emulsion;

a heat discoloration type coloring material; and

water,

wherein the polyvalent metal compound condenses pigments in the ink which is applied to the textile and suppress the pigments permeating the inside of the textile,

the resin emulsion fixes the pigments in the ink to the textile as the preprocessing liquid for the textile is dried,

the heat discoloration type coloring material forms color to show presence and degree of the application irregularity of the preprocessing liquid to the textile, and becomes unnoticeable in the textile by thermal treatment, and

the water is included in a water-based solvent.

2. The preprocessing liquid for textile printing according to claim 1 ,

wherein discoloration of the heat discoloration type coloring material caused by the heat is implemented through a thermal irreversible reaction.

3. The preprocessing liquid for textile printing according to claim 1 ,

wherein the preprocessing liquid forms color in an environment temperature at which the preprocessing liquid is applied to the textile, and becomes unnoticeable in the textile by thermal treatment of the textile thorough a thermal irreversible reaction.

4. An ink set for ink jet textile printing comprising:

the preprocessing liquid for textile printing according to claim 1 ; and

white ink for ink jet textile printing which contains white pigment,

wherein the preprocessing liquid is for the preprocessing of the textile printing of the white ink, and

the white ink is used for the purpose of hiding the textile or forming a base layer to which non-white ink is adhered.

5. An ink jet textile printing method using the preprocessing liquid for ink jet textile printing according to claim 1 , the method comprising:

applying the preprocessing liquid for textile printing to textile;

confirming whether the preprocessing liquid has been uniformly applied using a color of the preprocessing liquid;

heating the textile so that the heat discoloration type coloring material in the preprocessing liquid becomes unnoticeable in the textile; and

ink for ink jet textile printing by ejecting the ink to adhere to the textile.

6. The ink jet textile printing method according to claim 5 further comprising heating the textile after ink jet textile printing.

7. Preprocessing method for ink jet textile printing, the method comprising: applying the preprocessing liquid for textile printing of claim 1 to a textile; confirming whether the preprocessing liquid has been uniformly applied using the color of the preprocessing liquid.

8. Preprocessing method for ink jet textile printing according to claim 6 , the method further comprising after confirming:

heating the textile so that the heat discoloration type coloring material in the preprocessing liquid becomes unnoticeable in the textile heating the fabric after the preprocessing process at a temperature of not less than 100° C., and drying applied preprocessing liquid for textile printing.