In order to further improve the opening quality of the fiber raw material and improve the quality of the yarn, the development direction of the opening process is to improve the form and structure of the conveying machine, and widely use the licker, the needle or the needle roller. Comb parts, improve the opening degree of the fiber block, improve the structure and uniformity of the semi-finished products; strengthen the pre-opening of the fiber raw materials, use free strikes during the opening process, minimize the use of gripping blows; apply airflow and other The method of opening and removing impurities avoids fiber damage and cracking of impurities to reduce the resulting yarn defects.
It is specifically reflected in the quality indicators and the falling conditions of the semi-finished product (fiber roll or fiber layer) after opening. This includes:
1. Kinds and amount of impurities and defects in semi-finished products
2. Structure and uniformity of semi-finished products
3. Short fiber content in semi-finished products
4. The degree of opening of the fiber block is expressed by the average weight of the fiber block, the weight per unit volume, or the final velocity of free settlement in air, etc.
5. The amount of fibers contained in the litter
