Bio-polishing is a finishing process that uses cellulase to improve the surface of cotton fabric, in order to achieve durable anti-pilling and increase the smoothness and softness of the fabric. The function of the enzyme is to weaken the ends of the fibers, but it does not separate them from the yarn. It depends on mechanical force to complete this step.

    How does cellulase work?

    Hydrolyzed glucose, cellulose is a kind of unbranched glucose polymer composed of anhydrous D-glucose linked by 1,4-b-D-glucoside dai bond. This glycosidic bond can be hydrolyzed by fibroin and release a single glucose.

    Cellulase activity unit and definition:

    Activity unit, U or IU. The enzyme activity is the amount of enzyme required to convert 1 umol (micro mole) of substrate in 1 minute under specific conditions. It is called the activity unit of an enzyme, U, also called IU. The substrate includes soluble substrate (CMC) and insoluble substrate (filter paper). Substrate is different from cellulose, and enzyme activity is only the quality index and standard of the factory.

    Classification of cellulase:

    Acid cellulase: It is generally used under acidic conditions (PH-4.5-5). Because acidic treatment conditions often affect the color of fabrics, acid polishing enzyme is usually recommended to be used before dyeing.

    Neutral cellulase: It can be used before dyeing, after dyeing in a bath, and after dyeing. It can achieve the desired polishing effect in a wide PH (5-8) range. One bath polishing treatment is used for dyeing, and the inactivation treatment is achieved when adding soda to fix the color.

    Deactivation of cellulase:

    Increase the temperature by 80 ℃ * 10min or adjust the PH to 10 * 10min (Na2CO3 1-3g/l,), both at the same time or one of them.