Cellulase is fermented by a single mold species. It can hydrolyze the surface of cellulose and partially generate water-soluble products such as short-chain polysaccharides and glucose. Because the denim dyeing and finishing is only dyed on the surface of the fiber. Cellulase partially hydrolyzes the surface of cellulose at the same time. Remove the dye attached to the fiber surface. According to the requirements of the pH value of the water bath in the stone mill washing process. Cellulase is divided into acid cellulase and neutral cellulase.
The best use effect of acid cellulase is pH 4.5-5.5. It is more sensitive to pH and has a lower price. The best use effect of neutral cellulase is pH 6-8. It is more stable to pH value, and the price is higher. Process conditions: 1.0% to 1.5% of cellulase to the weight of clothing. pH value is 4.5～5.5 acid enzyme, 6～8 neutral enzyme. The treatment time is 45～120min, and the temperature is 50～60C. The dosage of pumice stone is 0～0.5kg/kg clothing, depending on the degree of aging. Bath ratio 1:10-15.
Stone washing with cellulase can greatly reduce the amount of pumice. Only use about 25% of the original pumice stone, even without pumice stone. At the same time, it can increase the washing capacity of the washing machine and reduce environmental pollution. As the pumice powder on the clothes is reduced, the clothes feel soft, natural and bright in color after washing. In the stone washing process, the indigo dye in the water bath is shed. Therefore, the neutral cellulase is suitable for the finishing of high-grade clothing. Acid cellulase can be used in low-grade and various stone rinsing processes.
