The quality of the opening machine is specifically reflected in the various quality indicators and falling objects of the semi-finished products (fiber rolls or fiber layers) after opening. What does it mainly include? Let's take a look at it together. 1. The type and quantity of impurities and defects in the semi-finished products; 2. The structure and uniformity of the semi-finished products; 3. The content of short fibers in the semi-finished products; 4. The opening degree of the fiber block, expressed by the average weight of the fiber block (g/block), unit volume weight (kg/m3) or the terminal velocity of the fiber block free settling in the air; 5. The number of spinnable fibers contained in the falling objects. In order to further improve the opening quality of fiber raw materials and improve the quality of yarn, the main development direction of the opening technology is: improving the form and structure of the opening mechanism, widely using combing mechanisms such as licker-in rollers, combing needle beaters or combing needle drums, improving the opening degree of fiber blocks, and improving the structure and uniformity of semi-finished products; strengthening the pre-opening of fiber raw materials, and using free striking more and holding striking as little as possible during the opening process; using airflow and other opening and impurity removal methods to avoid fiber damage and impurity breakage, so as to reduce the resulting yarn defects.