The quality of cotton determines the quality of yarns and fabrics in certain procedures. The type and content of impurities and defects in raw cotton not only affect the economic benefits of the supply and demand sides, but more importantly, it relates to the spinning process and product quality. If raw cotton impurities and defects are handled improperly, it will cause huge losses to textile companies. Therefore, the inspection of raw cotton impurities and defects has great significance for improving the initial processing of seed cotton, improving the performance of raw cotton, determining the spinning process, and improving the product quality.
Dry evenness refers to the thickness uniformity of the cross-section of the sliver in the length direction. The evenness of the gauze strips plays a decisive role in the subsequent uniformity of the dryness of the noodle strips, and the uniformity of the noodle strips is the main basis for evaluating the textile grades. The yarn becomes even and even, the fabric is smooth, the lines are clear, the shade is small, and the hand feels comfortable. Therefore, the quality of the textile processed by it is also high, and the requirements for the evenness of the strip are higher for the knitted fabric than for the woven fabric. In particular, avoiding details, slub yarns will cause destructiveness and obvious defects in textiles. If you want a good fabric appearance, you must have good yarn dryness. The following factors in raw cotton have a major influence on the evenness of the yarn:
1. Short fiber content and length uniformity. Because fiber length is the main basis for determining the spinning process and equipment. Roller gauge, pressurization, splitting multiples, twist spinning process index all have a significant effect on the sliver drying, and the short fiber content is closely related to the length uniformity. Generally, the short fiber content is high, and the uniformity is also poor. Therefore, the uniformity of the length and the content of short fibers have a great influence on the evenness of the yarn. In the spinning process, the secondary drawing mechanism cannot effectively control the fibers of different lengths, resulting in the loss of control of some fibers and the long floating time, which constitutes the main part of the floating fibers. The more plankton fibers there are, the more serious is the unevenness in the formation. If the textile factory uses cotton from different origins, when the length varies greatly, besides taking into account the short fiber content, it is also necessary to pay attention to the length of the fiber and reduce the difference in length between the cottons, because the length of the cotton in the mixed cotton is poor in uniformity, the roller distance, etc. Process parameters need to be readjusted.
2. Regain rate. The recovery rate of raw cotton also has a great influence on spinning in textile mills. As we all know, cotton fiber absorbs water and expands laterally, increasing strength, decreasing elasticity, increasing flexibility, increasing friction between each other, reducing the ability to generate static electricity, and reducing electrical resistance. Conversely, when cotton fibers lose water, they shrink laterally and lose strength. The elasticity becomes better, the friction between them decreases, and the ability to generate static electricity and the resistance increase. The regain rate of raw cotton is high, the cotton pieces are not easy to open, the laps are easy to adhere to the layers, the laps are not uniformly increased, the carding machine has low combing and impurity removal efficiency, the cotton nets are easy to droop, and the raw strip uniformity is poor. The high moisture regain of the thick strips and the increase of the softness of the cotton fibers are conducive to the control of the fibers by the rollers, and the secondary fibers are easily parallel to each other in the secondary process, and can increase the cohesion between the fibers, reduce the fly and improve the evenness of the stems. However, if the regain rate of the thick strip is too high, the winding phenomenon may occur on the rollers, rollers, and aprons. The moisture regain of raw cotton is too low. Fibers are easily broken and damaged in the textile process. Short fibers increase and the static electricity increases. The “dry-wound†phenomenon occurs in the parts of the rollers, rollers, and aprons.
3. Fineness. Studies have shown that the finer the fibers and the smaller the overall fineness, the better the uniformity of the strips is, but the fineness is often controlled by the maturity, the fineness is generally too small, the ripeness is generally poor, and the strength and grade are Low, the fibers are easily broken during the cleaning process, forming short fibers, and also forming nep, indirectly affecting the uniformity of the resulting yarn.
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