Reduction cleaning of disperse dyes

The disperse dye attached to the surface of the fiber will be "reduced" to become colorless and more soluble in water.

Traditional reduction cleaning method: using hydrosulfite and caustic soda for treatment.

1. 100% polyester fabric reduction cleaning process:

2. Polyester/cotton blended reduction cleaning process:

3. Disadvantages of traditional reduction cleaning method:

A. The complex process takes up a lot of dyeing time; multiple washings and neutralization will increase the amount of sewage discharged.

B. The traditional method is required to be carried out under alkaline conditions, while disperse dyes are dyed under acidic conditions. Therefore, after dyeing, the dyeing solution must be discharged first, then reduced to clean, then washed with hot water and cold water, and finally acidified. The whole process is complicated. Not only the energy consumption is large but also the process time is long and the efficiency is not high.

C. Sodium bicarbonate is actually not "insurable". Numerous accidents have shown that sodium bicarbonate is dangerous due to its spontaneous combustion, explosiveness, toxicity, flammability in contact with water or acid, and the instability of its aqueous solution. Sex, once an accident occurs, its fire hazard is huge.