Spinning process
When ring spinning is small, when spinning extra-fine special yarns, fine special yarns or high-quality cotton yarns, the combed spinning system is generally used; the carded spinning system is used for medium-special or thick special cotton yarns, and the coarse spinning system is used. Special yarns can be spun with rotor spinning machines to obtain higher economic benefits; cotton and polyester blended chemical fiber fabrics, ultra-fine special yarns and fine special yarns with high product quality requirements, cotton needs to be combed and finished, and polyester needs to be carded. System, and then mixed on the draw frame; the carded spinning system can be used when chemical fiber pure spinning or blended chemical fiber fabrics are produced. During production, measures such as milk feeding, preventing roll (layer) sticking, and stabilizing twist should be adopted according to the characteristics of the fiber. To ensure smooth spinning. Spinning fiber into yarn requires basic functions such as blowrooming, mixing, carding, drafting and combining, twisting and winding. The selection of each process flow is described below. (1) Opening and cleaning process 1. Requirements for packaging: 1. Implement the principles of “grasping multiple bags carefully, mixing in multiple warehouses, correct ingredients, loosening more and beating less, loosening first and then beating, loosening and beating alternately, falling early and breaking less, removing impurities at both ends (those, fine dust and adhesion)” impurities), blowing and carding connection, multiple automatics, fire and explosion protection, uniform cotton rolls, good structure” and other process principles. In rotor spinning, more attention should be paid to process requirements such as “removing more hard impurities and fine dust, and opening meticulously”. (2) Properly configure the cotton box machinery. In order to mix the raw materials with different components well, make the vertical and horizontal structure of the cotton layer uniform or output a uniform fiber flow, when combining single machines, 2-3 cotton boxes must be arranged alternately. box machinery. (3) Equipped with a multi-chamber mixing camera, it can improve the blending effect and make the coloring even. (4) Reasonably configure the counting quantity to adapt to the defective rates of different raw materials. Chemical fibers are looser and contain less defects, so the counting quantity can be smaller. The impurity rate and counting quantity of different raw materials are shown in Table 3-2.
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