For fabrics with slight chromatic aberration, the following methods can be used: When the exhaustion rate is reduced and a large amount of dye remains in the residual liquid, it can be adjusted by extending the dyeing time or increasing the dyeing temperature. When the dyeing depth is slightly higher, this color difference can also be corrected by adding surfactants to level dyeing.
1.1 Methods of color repair
Before correcting the shade, you must have a full understanding of the color of the dyed fabric and the nature of the dye solution. The following methods can be used to modify the color:
(1) It is not necessary to remove the dyed object from the dyeing vat, just cool the dye solution to 50~70℃, add the dye for color correction that has been prepared properly; then heat up the dyeing.
(2) The dyed fabric is unloaded from the dyeing machine, and then thrown into another dyeing machine, and then the dyeing process is performed by the boiling dyeing method and the guiding dyeing method.
1.2 The properties of color correction dyes
It is recommended that the dyes used for color repair have the following properties:
(1) The dyes will not be affected by surfactants and become slow dyeing. When the color correction operation is carried out, a large amount of anionic surfactant contained in the dye remains in the dye liquor, and a small amount of the color correction dye will form a slow-dyeing effect due to the presence of the surfactant. Therefore, dyes for color repair must be selected that are not easily affected by surfactants and have slow-dyeing effects.
(2) Stable dyes that are not easily affected by hydrolysis and reductive decomposition. Dyes for color repair, when used in very light-toned color repairs, the dye is easily hydrolyzed or decomposed by reduction. Therefore, dyes that are not affected by these factors must be selected.
(3) Dyes with good levelling properties. Must have good level dyeing ability to obtain level dyeing effect.
(4) Dyes with excellent light fastness. The amount of dyes used for color correction is usually very small. Therefore, its sublimation fastness and wet fastness are very important, but not as urgent as the light fastness. Generally, the dyes used in color repair are selected from the dyes used in the original dyeing formula. However, these dyes sometimes cannot meet the above conditions. In this case, it is recommended to choose the following dyes suitable for color repair:
C.I. (Dye Index): Disperse Yellow 46; Disperse Red 06; Disperse Red 146; Disperse Violet 25; Disperse Violet 23; Disperse Blue 56.