What are vat dyes?

Vat dye refers to being reduced under alkaline conditions to color the fiber, and then oxidized to restore the original insoluble dye on the fiber for dyeing cellulose fiber; the insoluble vat dye is made into sodium sulfate ester, Become a soluble vat dye, mainly used for cotton printing.

Dyeing method.

Vat dyeing mainly includes leuco dyeing and suspension pad dyeing.

The leuco dyeing process is to reduce the dye to leuco in advance, and the leuco in the dye bath is dyed by the fiber, and then oxidized, soaped and dried. The reduction method is divided into dry tank reduction and

Full bath restored.

During the full-bath reduction, the slurry dye can be directly dispersed in the dye bath. The powder dye is generally made into a thin paste with a small amount of dispersant or penetrant, then add 5-10 times warm water and mix thoroughly, and filter it through a fine sieve.

3.Vat dyeing process.

Loose yarn (warping) - cage loading - pretreatment - dyeing - oxidant oxidation - soaping - peracid and softening - dehydration and drying - winding