Development of cashmere-like pure spinning yarn
Material characteristics The cashmere-like fiber is polyester modified fiber, honeycomb microporous structure, low fiber strength, good cohesion, large rear zone drafting, small friction factor, fiber damage during spinning, fiber Poor spinnability. Process flow A002D cotton picking machine→A006BS automatic blending machine→ FA022-6 multi-bin blending machine (6 bin)→ A036BS porcupine opener, porcupine beater → A092AS double cotton box to cotton machine → A076C type single player Rolling machine → A186D carding machine → FA303 draw frame (three lanes) → A454PQ roving frame → FA502 spinning frame → AC338 automatic winder Process configuration and main process parameters Open cleaning process Because the cashmere fiber is fine in fineness, good in uniformity, low in strength, and free of impurities, the chemical fiber process and the hand-handling configuration are adopted in the process of opening and cleaning the cotton, and more and less, less grasping and grasping the principle of craftsmanship. Appropriately reduce the speed of each beater (comb 440r/min, integrated beater 800r/min), increase the gauge between the beater and the dust bar to reduce fiber damage and neps. The main process parameters of the cotton cleaning process are: lap length 30.6m, length tooth 34T, quantitative control 400g/m dry weight, unevenness 0.91%, normal volume 98%. The roll speed of the roll is 10r/min. Carding process According to the characteristics of cashmere-like fiber, in order to ensure the quality of the sliver and reduce the fiber damage, the carding adopts the principle of low speed, large gauge and quantitative majority. The use of chemical fiber type card clothing will reduce the speed, increase the surface speed ratio of the cylinder and the licker roll, reduce the cotton loss of the cover plate and the rear car, and the total amount of cotton should be controlled within 2.5%. In order to reduce the damage of fiber and the production of short pile, increase the distance between the licker and the cotton board, and increase the distance between the cylinder and the cover plate. The transfer rate of the doffer and the cylinder is large, and the fiber is reduced. Repeated twisting, increase the carding transfer, reduce the production of neps, make the closed small leaking bottom, the dust removing knife adopts the high knife flat angle process; the state of each combing part is kept good, eliminating the cloud spots generated by the cotton net, to prevent cotton The problem of net head, falling net, sag and cohesion is difficult. The double apron guide bar device is added, and the tension of the sliver is small, which ensures the smooth formation of the cotton net. Drawing process In order to ensure uniform mixing of the strips, three mixing is adopted, and the principle of “large gauge, multi-pressurization, low speed, heavy quantitative†is adopted. In order to reduce the phenomenon of "three windings" of the top roller, the top roller is selected from the Shore A85 rubber roller and treated with anti-wrap coating. Reasonable drafting configuration, after the mixing one, the drafting multiple is too large, and the total drafting is moderate. After the mixing, the drafting multiple is small, the total drafting multiple is too large, and the drafting multiple and the total drafting multiple are all biased after mixing three. Little mastery. Reasonable drafting configuration achieves the goal of improving the unevenness of the weight and improving the straightness of the fiber without deteriorating the strip. Roving process Because the length of the cashmere fiber is long, the fineness is fine, and the fiber cohesion is good, the process configuration of “heavy quantitative, large drafting, low speed, strong control, and large rear zone drawing (1.3 times)†is adopted to strengthen the pair. Control of the fiber in the drafting zone, and help to stabilize the drafting force and holding force, prevent the occurrence of "hard head", the roving twist coefficient is properly mastered (about 70), reduce the coarse detail and hairiness, and improve the uniformity of the yarn. At the same time, pay attention to the surface condition of the rubber roller and the control of the temperature and humidity of the workshop to reduce the formation of flying flowers. Spinning process In order to improve the quality of the yarn, the spun yarn process parts are optimized, and the rubber roller with higher hardness and better elasticity is selected, and the process principle of “reducing the drafting of the rear zone, small jaws and heavy pressure†is adopted, and The lower speed is configured. Because the length of the cashmere fiber is long, the uniformity is good, and the curl is good, the larger drafting ratio of the back zone is selected, the total draft is between 44 and 47 times, and the twist coefficient is determined to be around 390. In order to reduce the generation of hairiness, the PG14254 steel collar is used, and the wire ring is configured with the Model 6903, and the weight control is required. Winding process According to the characteristics of the fiber, the anti-friction coefficient is small, the spinning is performed by an automatic winder, the spinning tension is too small (6cN), and the vehicle speed is low (600r/min). In order to improve the production efficiency of the post-process, reduce the unwinding and unwinding break, the package is small (1.0kg). In addition, the metal trough reduces static phenomena and reduces the generation of hairiness. The cashmere-like fiber has a large elongation at break and a small anti-friction factor, so the spinnability is poor. In the spinning process, it should be noted that the roving process has a hard-headed phenomenon, and a large rear zone drafting is used as much as possible to improve the uniformity of the strip. The winding process uses a small tension and the speed is slow. In the spinning process, the process should be preferred to enhance the quality control of each process to ensure the quality of the yarn.
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