Dip dyeing is a method of immersing the dyed substance in the dyeing liquid, and through a certain dyeing process, the dye is gradually absorbed by the fiber to achieve the purpose of dyeing.
Dip dyeing of cotton skein: direct dyeing of cotton skein has been gradually reduced since the application of reduction, insoluble azo, vulcanization and other dyes with good dye fastness.
However, some colors (such as black) still maintain the advantages of direct dyes. The blackness of vat dyes is poor. Although sulfur dyes can achieve a certain blackness, the dyes are easily brittle and the direct dyeing can achieve blackness. Requirements without brittleness.
In addition, due to the low color fastness requirements of certain dyes, and the direct dyeing method is simpler and the cost becomes lower, so direct diazo black dyes are also used in skein in some cases Infiltrate.
Dipping of viscose strands. Process flow: strand preparation → dyeing → washing → dehydration → fixing → oiling → dehydration → drying.
Dip dyeing of silkworm silk. Process flow: skein refining → washing → dyeing → washing → dehydration → fixing → washing → oiling → dehydration → drying.
Dipping of cotton knitted fabrics. Process flow: grey cloth preparation → dyeing → washing → paraffin treatment → dehydration → drying.
Impregnation of wool and viscose blended fabrics: There are two methods for direct dyeing of wool and viscose blended fabrics. One is to use wool and viscose to dye the same color.
The other is to use a direct dye on the wool cloth to dye the viscose to make the wool white; or first dye the wool with an acid dye, and then use the direct dye to overdye to obtain a two-color effect. Craftsmanship