Fundamental changes have taken place in the supply and demand relationship in the domestic and foreign textile markets, and competition has become increasingly fierce. How to improve the competitiveness of export products in the international market is based on years of experience and analysis from the following aspects:
1. Strengthen quality standards
Polyester and viscose yarns are mostly produced according to industry standards. Although all indicators have reached the first-class level or above, there is still a certain gap compared with the international advanced level. In order to gradually move closer to international standards, on the one hand, we have strengthened quality management measures, improved various rules and regulations, and combined prevention and control. It also introduces advanced testing instruments such as Swiss Uster evenness tester, yarn defect grader and electronic yarn clearer to provide reliable guarantee for export yarn quality control.
2. Rely on technological improvement
Rely on technological progress to update the old Equipment, it also introduced air-jet spinning machines and fully automatic winding machines, and applied Uster evenness testers and yarn defect graders to conduct one-stop control of exported yarns, thus improving the scientificity and accuracy of product evaluation. The unevenness curve and spectrum obtained from the instrument test can also be analyzed to analyze the wavelength of the drafting wave to find out the cause of the mechanical wave and eliminate it. All flat wiping machines and machine modifications involving both rough and fine processes must undergo Uster evenness testing to effectively prevent the generation of mechanical waves.
3. Take preventive measures
1. Adhere to raw material control. Due to the large number of raw material manufacturers, rapid batch changes, and uneven quality, it brings certain difficulties to spinning production. In particular, the spinnability of chemical fiber raw materials and yarn quality are unstable. In order to prevent quality fluctuations, super length must be strictly controlled. Fiber and fiber defect content, and conduct single-wheat trial spinning. When batching is continued, the replacement ratio is controlled at about 5% each time, so as to ensure first-in, first-out to prevent color difference.
2. Ensuring the standard weight of the blown cotton rolls and controlling low unevenness are effective guarantees for reducing the CV% value of the finished yarn. There are differences in the CV% value of yarn spun from cotton laps of different weights. Therefore, the smaller the difference in cotton laps, the better. The upper and lower deviations are controlled at 0.1~0.2kg. The unevenness of cotton laps is less than 1.3%. The cotton laps are classified according to their weight. Store them separately, implement dedicated supply, and arrange them reasonably.
3. In polyester-viscose blends, because polyester fiber accounts for the main proportion, its fiber strength is high and its wear resistance is good. During the carding process, the cylinder and doffer It is easy to be damaged, so the process principles of “tight gauge, strong carding, four fast and one accurate” are required to ensure good card clothing sharpness, smoothness and flatness. The machine does not need to be processed overnight to reduce the difference between the machines. The cotton web will have no holes or bad edges, and the clarity of the cotton web will be improved.
4. The roughening process eliminates fiber hooks, strengthens straightening and parallelism, improves the internal structure of the yarn, and ultimately improves the CV% level of the finished yarn to ensure evenness. The CV% value is relatively stable.
5. In the production of spun yarn, it is often found that the eccentricity of the top roller can easily cause periodic unevenness of the evenness CV% value and increase the thick places, which seriously affects the quality of the yarn, so it must be carefully controlled. Effective measures to ensure the stability of evenness CV% are to manage extension parts, complete apron and roller matching and complete machine inspection.
6. In the spooling, combining and twisting processes, yarn defects are eliminated, tension is evened, friction is reduced and stretch is maintained. Inspect the tension rings one by one to ensure flexible rotation, smooth passage, and control the thread difference within 1g to eliminate the phenomenon of loose yarn and tight yarn. </p
