The role of each conventional finishing process and its impact on the color of the cloth
Finishing, dyeing and finishing garment fabrics
Finishing is the last step in the dyeing and finishing process. It is mainly responsible for processing gray fabrics into finished fabrics that meet the needs of various customers. , providing qualified clothing fabrics to clothing factories. For yarn-dyed fabrics, the production process includes: singeing, desizing, mercerizing, washing, shaping, adding color, raising, sanding, calendering, resin, coating, and preshrinking.
1. Singeing: mainly to burn off the fluff on the surface of the cloth to make the cloth surface smooth and clean. It has little effect on the color of the cloth surface.
2. Desizing: The sizing on the gray fabric is removed through the action of enzymes and high-temperature water washing. It has little effect on the color of the cloth surface, but attention should be paid to the impact of the staining of the whitening agent on the color of some white cloths when they are desizing at high temperatures.
3. Mercerizing: Mercerizing uses the effect of concentrated alkali on cotton fibers to increase the luster and strength of cotton. It usually makes the cloth surface darker, and as the concentration of mercerizing alkali increases, the degree of darker cloth surface color also increases.
4. Washing: For fabrics containing BLUE R dye, the washing fastness of the dye is reduced due to the action of alkali after mercerization. In order to ensure the washing fastness of the finished product, Post-finishing needs to be washed after mercerization. It can be seen that the fabric containing BLUE R dye will be lighter and less blue after washing.
5. Softening and styling: Some softeners have self-crosslinking properties and form a film on the surface of the fabric during styling, thus having a certain deepening effect. But the difference is not obvious. In addition, if the sublimation fastness of disperse dyes is not good at high temperatures, the color and fastness may be affected by the dye migrating to the surface.
6. Additive color: For fabrics with a clear color or a nearly clear color whose color is significantly different from the standard, the color can be adjusted through jig dyeing.
7. Pre-shrinking: Pre-shrinking is a method of shrinking the fabric to meet customer requirements through mechanical action, and has little effect on the color.
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