Production Points Of 100% Dope Dyed Polyester Yarn

　　(1) In terms of raw material selection, 100% dope dyed polyester yarn requires that the length of the main body of the colored cotton blend is not less than 28mm, the strength of the blended cotton is not less than 27cN/tex, the fineness is 1.65dtex, and the neps are not higher than 220 grains/g. The short-staple rate is not higher than 12%; while the fineness of dope-dyed recycled polyester is 1.56dtex, and the main body length is 39mm.

　　(2) 100% dope dyed polyester yarn has a large volume-specific resistance and poor conductivity. It needs pre-spinning pretreatment (anti-static treatment) and adopts the principle of separate allocation. Different polyesters need to be mixed according to their proportions and quality. After that, the oil agent health treatment is carried out first, and it is simmered for 24 h~48 h, and the humidification time is increased at the same time.

　　(3) Since the strength of polyester is worse than that of ordinary polyester, and the quality difference is large, the cleaning process should adopt the process design principle of soft opening. It is advisable to use light quantity, less feeding, frequent grasping, more combing, less beating, and less shedding, to achieve a soft opening.

　　(4) There are a few double-length fibers and parallel threads in the raw materials. To ensure the clarity of the cotton web, the carding process design follows the principle of "medium gauge, low speed, and lightweight". At the same time, increase the number of fixed covers and increase the For the carding area and effective transfer of fibers, reduce the occurrence of short, thick, and parallel threads when colored cotton is mixed with 100% dope dyed polyester yarn, effectively remove impurities and reduce weight unevenness.

　　(5) The drawing process adopts a large gauge in the rear area, and three combined large drafts to increase the combined elongation of the fibers. The twist coefficient of the roving should be about 10~15 larger than that of conventional varieties, and the design of the roller gauge is based on the principle of "relaxing the characteristics of different lengths between fibers". Due to the high temperature in the spinning workshop, the fiber frit adheres to the traveler and the yarn, which is prone to oily yarn and winding cots. To reduce frictional resistance, large gauge blocks and small travelers should be selected in the spinning process, which is conducive to smooth drafting and fast winding.

　　(6) Since there are still a large number of defects in the spun yarn of this variety, the production efficiency of the winding process is 10% to 15% lower than that of conventional varieties, and most of them are alarming phenomena of neps and short thick yarns. Therefore, reasonable setting of yarn clearing process parameters is the last pass to ensure yarn quality. Since the 100% dope dyed polyester yarn is antistatic treated before spinning, it is necessary to control the amount of oil used, otherwise, it is easy to block the pipeline and cause yarn defects. At the same time, strengthen the inspection of packages to reduce the occurrence of cloth surface color crosspieces.

　　After adopting the above-mentioned spinning technical measures, the spinning quality of 100% dope dyed polyester yarn is significantly improved compared with the conventional process, that is, the thousand-meter thick place is reduced by 10%, the thousand-meter fine point is reduced by 5%, and the thousand-meter nep is reduced by 20%, The efficiency of the loom is increased by 5%, and the phenomenon of color bars is significantly reduced.