In addition to cotton quality and blended cotton quality, the only processes that can reduce neps in knitted fabric cotton yarn quality are generally the carding process and the combing process. Of course, the winding process also has a certain effect on removing large neps caused by the previous process. , however, due to the influence of friction and tension of the winding machine, small neps and hairy neps have increased significantly. Therefore, as a winding process, the number of neps has increased significantly. Therefore, the carding process and combing process must be controlled. The quality of the sliver is a key factor in reducing neps in knitted fabric cotton yarn. Different qualities of knitted fabric cotton yarn have different quality requirements for carded sliver and combed sliver.
Since carded yarn for knitted fabrics and combed yarn for knitted fabrics have different quality requirements for cotton yarn neps, the neps, short staple rate, immature fiber content ratio, and belt fibers in the carding process and combing process during the spinning process are controlled. Seed chips will be very critical and useful for knitting yarns of different qualities for carded knitted fabrics and combed knitted fabrics. Therefore, the main physical properties of the slivers in the carding process and combing process are controlled according to the quality requirements of cotton yarns in different knitted fabrics. The quality of the index is particularly important, otherwise the processes after the combing process will no longer be able to reduce the neps of knitted fabric cotton yarn. Therefore, the key processes in the spinning process are the carding process and the combing process. The quality of sliver must be strictly and effectively controlled to ensure the different uses of carded knitted cotton yarn and combed knitted cotton yarn, especially for carding process, combing process sliver neps, and fiber seeds. The control of lint and short staple ratio should not be vague.
Analysis of the generation and control requirements of different types of neps:
① Dead cotton neps are caused by too much immature fiber content in cotton, poor maturity, too much fibrous seed debris, too many neps, and too high short lint content. This requires textile mills to improve knitted fabrics. When blending cotton yarn, especially high-end knitted fabric cotton yarn, the maturity, neps, fibrous seeds, and short staple rate of the cotton must be strictly based on the quality requirements of the knitted fabric cotton yarn and the blending cotton standard. Otherwise, The production of a large number of dead cotton neps during the spinning process is an inevitable result; in addition, blowroom carding removes harmful short staples and impurities, and the carding function of the carding machine is to reduce dead cotton neps and fibrous seed debris in cotton. The key is that the combing machine’s removal of a large amount of short staple rate and immature fibers is the most effective way to remove dead cotton neps from combed yarn; ensuring that the immature fiber content in cotton yarn is reduced is the key to reducing the dead cotton content of knitted fabrics. Principles that must be paid attention to when knotting.
② Flying neps are also very harmful to knitted fabrics. In severe cases, they can cause holes in knitted fabrics. The cause of flying neps comes from the management and cleaning work of textile and knitting factories. As long as the textile factory If the air-conditioning dust removal system is poor and the air-conditioning dust removal is not cleaned in time, a large number of flying neps will be produced during the spinning process; of course, the most serious reasons for the generation of flying neps are due to poor production management and poor cleaning work. Insufficient cleaning, etc.; in addition, the maintenance cycle of the equipment is too long, the inside of the equipment is too dirty, the refueling part of the equipment is refueled too much, the channels of the equipment are poorly clean and smooth, etc.
③ Hairiness neps are also an important factor affecting the quality of knitted fabrics. Hairiness neps are mainly caused by the short lint rate in cotton slivers and the short lint rate in cotton yarn. To reduce hairiness neps, we must: Reduce carding The short staple rate of cotton sliver and combed sliver; further keep the spinning channel clean and smooth; keep the speed of spinning frame and winding machine within a reasonable range; ensure the smoothness and correct feeding of spinning process components with their reasonable usage cycles.
④ Cotton balls on knitted fabrics are mainly caused by friction with cotton yarn fly and hairiness. Therefore, strengthening the cleaning work during the spinning and knitting and weaving processes is particularly effective in reducing cotton balls in knitted fabrics and maintaining them. The smoothness of spinning and weaving process equipment and channels can also further reduce cotton balls in knitted fabrics.
⑤ The color spots on the fabric surface of knitted fabrics are a manifestation of the large number of neps in the cotton yarn of knitted fabrics. They are generally caused by the large number of neps in cotton and blended cotton. Also, the cotton yarn has more hairiness during the winding process. It is the result of a large number of neps produced by rubbing and friction during the knitting machine process; in addition, it is caused by the large amount of fibrous seed debris in the cotton that is not removed during the spinning process and remains in the cotton yarn.