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Discussion On The Influence Of Raw Cotton Quality On Textile Product Quality One Or Two

2014/1/9 15:36:00 131

the quality of cotton determines the quality of yarn and fabric in a certain way. The types and contents of impurities and defects in raw cotton are not only related to the economic benefits of the supplier and the buyer, but also more importantly to the yarn spinning process and product quality. If the raw cotton impurities and defects are not handled properly, it will cause great losses to the textile enterprises. Therefore, the inspection of raw cotton impurities and defects is of great significance for improving the initial processing of seed cotton, improving the performance of raw cotton, determining the spinning process and improving the quality of products. The author talks about the impact of raw cotton quality on yarn quality. 
 the effect on yarn evenness is less than /strong > /p >
 evenness is the evenness of the cross section of the yarn in the length direction. The evenness of yarn evenness plays a decisive role in evenness of cloth evenness, and the evenness of cloth drying is the main basis for evaluating textile grade. The resultant yarn is uniform in evenness, smooth in fabric, clear in texture, less in shape and comfortable in hand, so the quality of textile processed by it is high, and the evenness of knitted fabric is higher than that of woven fabric. In particular, avoid details and slub yarn will cause obvious breakage of broken ends and textiles. If you want a good fabric appearance, you must have a good evenness of yarn evenness. The following factors affect the evenness of yarn evenness: 
 1. < a href= "//www.sjfzxm.com/news/list.aspx? Classid=101112105" > short fiber < /a > content and length uniformity. Fiber length is the main basis for spinning process and equipment. Roller spacing, pressure, drawing ratio and twist spinning process index have significant effect on yarn evenness, while short fiber content is closely related to length uniformity. Generally, the uniformity of short fiber content is high, so the uniformity of length and short fiber content have great influence on yarn evenness. In the spinning process, the pulling mechanism can not effectively control the fibers of different lengths, causing some fibers to run out of control and float for a long time, which constitute the main part of the floating fibers. The more the floating fiber is, the more serious the degree of heterogeneity is. If the cotton plant uses cotton from different origins and varies greatly in length, in addition to considering the short fiber content, the length of the fiber should also be paid attention to, and the length difference of the cotton will be reduced, because the technological parameters such as the length uniformity and the roller spacing should be readjusted. 
 2. moisture regain. The moisture regain of raw cotton also has great influence on spinning of textile mills. As we all know, cotton fibers absorb water, expand horizontally, increase their elasticity, increase their elasticity, increase their softness, increase their friction each other, and reduce their ability to produce static electricity and resistance. Conversely, when cotton fibers lose their water, they contract, decrease their strength, improve their elasticity and reduce their mutual friction. Raw cotton has high moisture regain, cotton blocks are not easy to loose, cotton rolls are laminated easily, cotton rolls are not evenly increased, carding machine has low efficiency of separating and removing impurities, cotton NetEase droop, and sliver evenness is poor. The high moisture content of the coarse bar and the increase of softness of cotton fiber are beneficial to the control of fiber by rollers. The fiber Yi Zhong value is parallel in the pulling process, and it can increase the cohesion between fibers, reduce flying flowers and improve evenness. However, the coarse bar moisture regain is too high, it is easy to roll around the roller, roller, leather and other parts. The moisture regain of raw cotton is too low. The fibers are easily interrupted and damaged during the textile process. Short fibers increase and static electricity increases, resulting in the phenomenon of "dry winding" in the roller, roller and leather belt. 
 3. fineness. The research shows that the finer the fiber and the smaller the overall fineness, the better the evenness of the evenness will be. However, fineness is often controlled by maturity, fineness is too fine and maturity is generally poor, strength and grade are low, fibers in the carding process are easy to break, forming short fiber, and forming neps, which indirectly affect evenness of yarn evenness. 
The effect of strong > on the neps and impurities in yarn. .
 > a href= "//www.sjfzxm.com/news/list.aspx Classid=101112108" > raw cotton defect < /a > impurity is the main reason that affects yarn neps and impurities. There are seven kinds of raw cotton defects: silk, neps, sterile seeds, broken seeds, fiber seed chips, soft seed skins and stiff pieces. 
 raw cotton impurities and defects can be divided into three categories: the first category is easy to remove, and the two kinds of bolls, such as silt and cotton seeds, which are less susceptible to yarn neps and impurities, are the two categories that are easily broken and not easy to remove. Impurities such as sterile seeds, broken seeds and fibrous seed chips are the most harmful impurities that are not easy to be eliminated, but also harmful to the quality of gauze. The harm of cotton seed chips, soft seed skins, neps and other defects in cotton is mainly that the short fibers are twisted into the yarn when twisting, and the seed chips, neps and soft seed skins are exposed on the surface of the finished products, resulting in the increase of neps and impurities, the formation of coarse joints, the deterioration of the yarn, the increase of yarn hairiness and the increase of broken ends, especially the neps. Because of the difference in color absorption with normal yarns, the grey fabric is dyed well, and the neps around the neps can not be absorbed, forming a "white star", resulting in the color difference, which seriously affects the quality of the dyed and dyed fabrics. The above defects, due to the adhesion between fibers and fibers, need to be eliminated in the carding process. Neps and fiber chips are difficult to exclude even after carding process, which seriously affects the quality of high-grade products. 
 the effect of yarn breaking rate 
 cotton spinning mainly consists of two kinds of ring spinning and air spinning. The reasons for the breakage are very different. The breakage of the ring yarn is mainly due to the strength of the yarn is less than the tension of the air ring, and the breakage of the yarn is mainly caused by the aggregation of dust particles in the condensate tank of the textile cup. 
 the influence of impurity content of raw cotton fiber on the rotor spinning is greater than that of ring spinning. The impurity content and the size of dust particles affect the performance of the yarn and the working state of the spinning mechanism. The impurity particles are suspended in the carding air and enter the spinning cup. Centrifugal force is generated when the spinning cup rotates. These particles are easily precipitated in the inner wall of the spinning cup under the action of centrifugal force. Once deposited, they can only be stopped manually by removing the yarn. If the impurity particles are concentrated in a certain point in the condensate tank, such as larger particles stuck in the condensate tank, it is easy to cause breakage. 
 the influence of foreign fibers and colored fibers on textile > /strong > /p >
 foreign fiber and < a href= "//www.sjfzxm.com/news/list.aspx Classid=101112107" > color fiber < /a > great harm to the quality of gauze. Mixed fibers and colored fibers are mixed into cotton. Because they have fiber properties, fine, long and light, they are not only difficult to remove in spinning process, but may be broken or combed into shorter and finer fibers in the process of cleaning and combing. Some of them are broken and become numerous fibrous tiny defects. When spinning, these defects form yarn faults and are easy to cause broken ends of yarn and reduce production efficiency. In weaving, because these defects are attached to the surface of the yarn, it is easy to produce yarn intermixing on the cloth machine, which greatly increases the fabric defects such as false lifting, breaking, shrinking and so on. When bleaching, different colors of the cotton yarn and grey cloth mixed with foreign fibers and colored fibers are stained with different dyeing properties of different fibers, and all kinds of color spots appear, which are exposed to the cloth surface and form a color defect, which seriously affects the appearance quality of the cloth. 
 problems needing improvement in practical work 
 in practical work, it is found that there are no benefits to the spinning of neps, wires and seeds without breaking seed shells. The textile factories have already included impurities in neps, wires and seeds without breaking seed shells, which is one of the main reasons for the impurity testing in the inspection department and the results of impurity testing in textile enterprises. In view of the fact that there are no differences between the harms of cotton neps, wire ROPS and seeds without breaking seed shells in the same way as impurities, in order to harmonizes the standards, further enhance the international competitiveness of cotton inspection methods in China and the guiding significance in practical work, and promote the improvement of the quality of raw cotton in China, and facilitate the use of the textile industry, the author suggests that the rigid pieces of silk, neps and seeds without breaking seed shells should be included in the definition of impurities. The inspection methods should be consistent with the methods of defect detection, and should be tested in the 10g test samples. This will better guide the textile mills to accurately calculate the amount of cotton, reduce the cost, and reduce the defects of finished products and improve the quality of products.