Use the blades, wings, nails or needle teeth on the high-speed rotating beater (commonly known as the beater) to strike the fed fiber material or pierce the fiber layer at the same time for division and combing, destroying the fiber and the fiber and the fiber. The bonding force between the impurities achieves the purpose of further loosening the fiber mass and removing the impurities. The loosening is usually carried out on the basis of loosening. After loosening, the fiber mass can be loosened to be smaller, the fine impurities can be removed, and the structure and uniformity of the semi-product can be improved.
According to the method of feeding fiber raw materials, the loosening effect can be divided into two forms: gripping and free striking. The fiber material is slowly fed in the grip state and is hit by the beater rotating at a high speed, which is called the grip blow. If the fiber material is fed in a free state and is hit by a beater, it is called a free hit. The fiber layer vibrates and deforms under the action of holding and striking, and the whiskers are loosened into many smaller fiber pieces. Because the impulse of the hitting force exerted by the beater on the whole beard bundle is larger, the degree of loosening of the fiber block is higher. If the feed amount of fiber raw material per unit time is kept constant, and the speed of the beater is increased, the degree of looseness can be increased. When the fiber material is hit by freedom. It can be known from the principle of dynamics that the impulse of the striking force acting on the mass point of the fiber mass is equal to the change of momentum during the action of the impulse. Under the action of the striking force, the fiber block deforms and loosens and obtains a new movement speed. When the striking force is greater than the bonding force between the fibers, the fibers are loosened. On the contrary, when the bonding force between the fibers is large enough, the entire fiber block moves at the speed of the loosening machine. Therefore, the effect of free strike is relatively mild, and the degree of fiber damage and impurity fragmentation is small. In spinning production, mainly according to the nature of the fiber raw materials and the preparations before loosening, determine the type of blow and machine parts used. Commonly used loosening machines include corner nail rollers, needle rollers and serrated rollers, as well as porcupine beaters (also known as porcupine cylinders), wing beaters, needle beaters, integrated beaters and tooth beaters.