Ways and methods for reducing hairiness of cotton yarn

1. <br> yarn hairiness problem of fiber fluff extending yarns of different forms of the matrix is divided into: an end hairiness, hairiness and floating ring hairiness three kinds; divided by the yarn direction: to hairiness head, tail to the hairiness, bidirectional Hairiness, circle hairiness and chaos hairiness are counted. In general, the hairiness of 0.5~1 mm length accounts for about 60% of the total, the hairiness of 1~3 mm length accounts for about 35% of the total, and the hairiness of 3mm or more is about 5% of the total hairiness. Cotton yarn is usually made by twisting and twisting one short fiber. It is inevitable that hairiness protrudes from the yarn body. The key point is that hairiness above 3mm will seriously affect the production of the back channel and affect the yarn and its final product. Appearance, feel and performance. For example, the yarns are easily entangled, resulting in the yarn not passing smoothly through the stop, the eye and the caries, resulting in unclear openings or broken ends. When used on a shuttleless loom, the loom is mostly small shed, large tension, high speed working state. If the yarn hairiness problem is serious, the warp yarn will be blocked and the weaving efficiency will be reduced. It can be said that controlling the hairiness of cotton yarn is the key to tissue weaving production. In addition to adversely affecting the quality of cotton fabric products, the problem of cotton yarn hairiness will fall off due to friction in downstream processes, resulting in flying flowers, causing environmental pollution problems and endangering people's health.
2 Hairiness causes 2.1 Fiber properties Cotton yarn hairiness is related to the maturity, length, short pile rate and fineness of cotton fiber. Hairiness is mostly formed by the exposure of the fiber ends in the yarn body. The more the number of fibers in the yarn , the more the number of head and tail. The other conditions are the same, the more the number of hairiness, the shorter the fiber length, the easier it is to produce hairiness. Studies by many scholars have shown that in many physical and mechanical properties of fibers, the torsional stiffness and flexural rigidity of cotton fibers are the most closely related mechanical properties related to yarn hairiness. The torsional stiffness and flexural rigidity of the cotton fiber are large, and the possibility of the fiber end protruding from the yarn body is large, and the hairiness is formed. According to the analysis, the root end of the cotton fiber is thicker than the slightly thicker end, and the stiffness is larger. The root end is more likely to protrude from the yarn body than the slightly end and become the hairiness. Therefore, the end hairiness of the cotton yarn is mostly the root end of the cotton fiber.
3. Under certain process conditions, the maturity of raw cotton is high, and when the fine cotton and long-staple cotton are spun, the hairiness is less. According to the analysis, the maturity of the raw cotton is high, the strength of the cotton fiber is good, and the fiber is relatively uniform in thickness and long in length. The number of fibers per unit length of the yarn is reduced, the fiber head is reduced, and the long fibers are susceptible to the twisting torque and the interfiber friction to shorten the length of the fiber head which may protrude from the yarn body. Therefore, the yarn body is smooth and the hairiness is small.
2.3 Spinning process (1) Spinning is the key process of spinning, and the advantages and disadvantages of its spinning equipment have a great influence on the yarn hairiness. The main performances are as follows: 1 The diameter of the steel collar is not accurate, the roundness and flatness are poor, or there are ripples, burrs, unevenness and unevenness. The steel collar is not flat or moving, and the up and down movement is not vertical, which will cause the spinning tension. Fluctuation fluctuations and friction effects increase, resulting in increased yarn hairiness; 2 poor fit of the wire ring and the steel collar, intarsia, will cause a significant increase in yarn hairiness; 3 yarn guide hooks, the friction on the yarn will increase the hairiness 4 rubber roller apron hardness is too large, static electricity accumulation, will lead to serious winding, hairiness; 5 spindles are not accurate to the center of the spindle tip, causing the spinning tension to fluctuate and increase the number of yarn hairiness.
(2) The yarn applicator can gather the edge fiber of the sliver to make the sliver structure compact and smooth, thereby reducing hairiness. However, if the opening of the applicator is too small, the cotton bead will be roughened and the cotton yarn hairiness will be increased.
(3) The encirclement arc of the yarn to the yarn guide hook is too large, which will affect the transmission of the twist, the twist of the spinning section is reduced, and the hairiness will increase.
(4) Spinning speed and workshop temperature and humidity conditions are also important factors affecting hairiness. The number of yarns in the yarn increases proportionally with the speed of the spinning spindle. When the relative humidity of the spinning frame is less than 50%, the yarn hairiness will increase sharply.
(5) The process conditions and equipment condition of the twisting part of the spinning frame are poor; the yarn is scratched, which will damage the yarn structure and increase the hairiness. During the twisting process, the alien flying flower and the short velvet are attached to the yarn body and partially smashed into the yarn, and hairiness is also formed.
Process parameters. 1 The higher the speed, the greater the friction between the yarn and the groove, the greater the damage to the yarn, and the increase in the number of hairiness; 2 the weight of the tension piece, the tension of the winding, the friction between the yarn and the components of the winding passage When the force is increased, the hairiness of the cotton yarn becomes longer and longer; 3 the clearance of the yarn clearing is too small, the yarn is damaged by the friction with the clearing plate, and the hairiness is increased; the position of the 4 ring ring is too high, and the yarn guiding distance is too large. The friction between the yarn and the winding component, the yarn and the cop, respectively, will increase, and the amount of hairiness will increase accordingly; the volume of the 5 cylinders will also have a certain influence on the hairiness of the cotton yarn. If the package is too large, the weight of the package is large, the friction between the package and the groove is large, the yarn is damaged, and the amount of cotton yarn is increased.