Post-processing steps of spinning process
1. Pipe doubling and bobbin doubling The bobbin doubling is a simple machine without meridians. The bobbins are directly fed into the doubling machine, eliminating a winding process. It can reduce infrastructure investment, but the tension of the strands is not uniform enough, and it is easy to produce core yarns, and there are many knots and details. The process flow is: bobbin → doubling machine → twisting machine. The tube doubling is a simple yarn feeding doubling machine, and the process flow is: bobbin → winding machine → doubling machine → twisting machine. The strands have uniform tension, high strength, fewer knots and details, fewer joints, and high production efficiency. The doubling and twisting combination is to complete doubling and twisting at the same time through the doubling and twisting combined machine. The process flow is: bobbin → winding machine → doubling and twisting combined machine. It saves the yarn doubling process, reduces equipment investment, and avoids some shortcomings of doubling, but sometimes it is easy to produce core yarn, so it is suitable for general fabric yarns. 2. Dry twisting and wet twisting, single twisting and double twisting. When there are no special requirements for the strength and appearance of the spinning yarn, dry twisting is generally used to save the water equipment and management costs of the twisting machine. For some industrial threads or strong strands, wet twisting can be used when the strength and appearance requirements are high. In wet twisting, due to the penetration of water molecules into the spinning yarn, the surface hairiness is close to the surface of the spinning yarn, which improves the utilization coefficient of fiber strength. Therefore, the spinning yarn has higher strength, and the spinning yarn is clean and has a better appearance. Double-stranded wire or triple-stranded wire is single-twisted, and twisted once to form a wire. Multi-strand wires are generally multi-twisted or twice-twisted to form a wire depending on the number of strands to be combined. 3. Indirect weft yarn and direct weft yarn Indirect weft yarn means that the weft yarn is first wound on the spinning machine into the same package as the warp yarn, and then the weft yarn is simplified and rolled into a weft yarn package, because the winding process can remove the knots and benefit The yarn is weakly twisted, so the output and quality of the loom are improved. Direct weft yarn refers to directly using the weft yarn package dropped from the spinning frame to weave cloth, so a smaller steel ring diameter should be used on the spinning frame. The weaving and weft rolling processes are omitted, the process is shortened, and equipment investment can be reduced. However, there is no chance for yarn defects to be removed, which affects product quality. And due to the small bobbin capacity, the number of doffing times of the spinning frame increases, and the production efficiency of the spinning frame decreases. When weaving on a shuttleless loom, the weft yarn is fed in the form of package yarn, so the production efficiency of the spinning machine is not affected. 4. Singing: When there are special requirements for the integrity of the strands, such as various sewing threads, strands for handicrafts, etc., they should be singed after being twisted into yarn to further remove the lint on the surface of the strands. Generally, a gas singeing machine is used, and the singeing rate of fine yarn should be controlled at 3%-5%. 5. Cheese yarn and skein yarn The cheese yarn is packed in cartons or bags. The hank yarn is shaken into skein yarn by a shackle machine, and then packaged into small and medium packages by a baling machine. At present, the package form of cheese yarn is generally adopted. When long-distance transportation or spinning yarn needs to be dyed (dyed weaving), it can also be made into skein yarn. 6. Heat setting twist In order to stabilize the twist and prevent weft shrinkage, kinks and other defects caused by strong twisting during weaving, strong twisting of pure cotton fine yarn, polyester-cotton blended chemical fiber fabric weft yarn, co-twisted strands, rotor spinning, etc. is required Equipped with heat setting and twisting equipment.
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