Color difference prevention plan for dyeing cotton knitted fabric

Reactive dyes have good fastness, complete chromatogram, and bright color. They are widely used in the dyeing of pure cotton knitted fabrics. In production, dark colors (black, dark gray, navy blue, coffee, etc.) have a greater probability of color difference than light colors; the probability of color difference in three-color matching is greater than that of two-color or single color. Therefore, the chromatic aberration is closely related to the performance of the dye and the compatibility between the dyes, and also related to the quality of the fabric before dyeing and the rationality of the process conditions.

1.Pre-processing:

The purpose of the pre-treatment is to improve the wool effect and whiteness of the fabric, so as to facilitate the dyeing of the fiber evenly and quickly. Through reasonable design of cloth feeding sequence, time, feeding method and washing process, uniform hair effect, whiteness, PH value, etc. can be obtained. ‍

2.Dye:

Since most of the two-color or three-color combination is prone to chromatic aberration, analyzing the compatibility of dyes is of great significance to reducing the chromatic aberration. Preliminary screening of dyes can be carried out by percolation experiment method, and dyes with similar lifting power can be selected. In addition, whether the dye uptake curves of the dyes are similar or not will also have a certain impact on the color difference. Dyes with similar dye uptake curves have better matching. ‍