The purpose of desizing is to remove the sizing agent on the garment, so as to facilitate the post-processing to have good production conditions. Denim is mostly made of starch or modified starch slurry, which can be desizing by amylase. Commonly used desizing process formula, calculated per liter. BF-7658 amylase 1-2g, table salt 2–5g. Penetrant 1～2g, glacial acetic acid 0.5～1.5mL, softener 0-2g. Process conditions: pH value 6-7, bath ratio 1:10-15. The temperature is 50～60C, and the time is 30min. Because alkali is usually left on denim, acetic acid is added to the desizing bath. Adjust the pH value from 6 to 7 to make the BF-7658 amylase exert its best performance. The softener is added to cause streaks in the desizing process of some heavy denim.
Polishing enzymes can be used for polishing. Polishing enzyme is a kind of protein that has a catalytic effect on cellulose. The enzyme molecule is more than a thousand times larger than the water molecule. Therefore, it cannot penetrate into the fiber. Hydrolysis can only be carried out on the 1.4-p-glucose bond on or near the surface of the cellulose fiber. Biological polishing enzyme 0.5%～2.0%, to the weight of clothes. Temperature 45～55℃, time 30～60min, penetrant 0.5g/L. After finishing the clothes with biological polishing enzyme, the surface fluff is almost hard to see. It is not easy to produce fluffing and pilling. The moisture absorption, drape and hand feel of clothing have been significantly improved. Use the method of controlling the weight loss of 3% to 5% to judge the smoothing effect, without excessive damage to the strength. However, after bio-polishing, some of the color shades have changed greatly. Pay attention to it during use.
