One of the open-end spinning methods, it is called rotor spinning because it uses a rotor to condense single fibers. At the beginning, air flow was mainly used, which is also called air spinning in China. Rotor spinning has high spinning speed and large winding capacity. It has good suitability for spinning low-grade cotton and waste waste cotton, and the working environment is also greatly improved.
Principle
The fed fiber strips are opened by the rotary carding roller covered with card clothing. The single fiber is transported to the inner wall of the high-speed rotating rotor with the air flow, and forms a yarn tail in the condensation tank. At the same time, it is twisted into yarn and drawn out, and is directly wound into a bobbin. The main difference between rotor spinning and other open-end spinning methods is the different condensing and twisting mechanisms. After the single fiber enters the rotor, it is first sent to the inclined surface of the inner wall of the rotor. The fibers are arranged in parallel along the circumferential direction of the inner wall , under the action of centrifugal force, slide into the cohesion groove at the large diameter of the inner wall, where they overlap into annular whiskers. This is the cohesion process of the fibers. During the cohesion process, the fibers are arranged in a circumferential cycle, so there is merger. Effect. The rotor drives the AB yarn segments to rise together. Rotating at a high speed, due to the friction of the blocked twister at A, twisting occurs in the AB yarn segment and the drawn yarn segment. The twisting force in the AB yarn segment is transmitted to the BC length of the yarn tail in the condensation tank. , so that the yarn tail has a certain strength near the peeling point B. force, which can reduce end breakage. During normal spinning, the yarn tail is gradually peeled off and drawn out from point B, so the rotation speed of the AB yarn segment generally exceeds the rotor speed. The difference between the two linear speeds is the winding linear speed or Output speed. The yarn tail in the condenser tank is at the peeling point. The number of fibers at B is equal to the number of fibers in the cross section of the yarn, and then gradually becomes thinner. Theoretically, the number of fibers at D at the end of the circle should be zero, but in fact the fibers in the cup continue to slide downward, so at point D. There are fibers that overlap with the peeling point B. When the strip is twisted and peeled off, the fibers located in front of point B along the rotor rotation direction become part of the yarn, while the part of the fiber located behind point B is easily taken out and wrapped around the outer layer of the yarn body, forming the winding of the air-flow yarn. Fiber.
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