In the past two decades, the quality of spinning has advanced by leaps and bounds, and the requirements for yarn quality have also increased. Pursuing zero defects and flawless production, and continuously improving the intrinsic and appearance quality of products, it is a modern enterprise that pursues the combination of high quality and high efficiency. It not only requires high internal and appearance quality, but also meets the requirements of high quality. Efficient weaving production. For example, the production method of “light-off production, continuous weaving†puts high demands on yarn quality.
On the one hand, the improvement of cotton quality provides conditions for the improvement of yarn quality level. On the other hand, the improvement of equipment technology level and the quality of key equipment guarantees the improvement of spinning quality level. According to reports, in the past CJ14.6tex strip unevenness rate of less than 14% can be said to be the industry's advanced level, while the current 11% is normal, the high level has reached less than 10%.
Nowadays, widely used optical, mechanical, electrical, pneumatic, hydraulic and other sensing technologies and frequency conversion technologies have promoted the development of spinning technology to automation, intelligence and continuity, which not only improves production efficiency and labor productivity, but also quality. The modernization, systematization and scientific creation of management means have created conditions, which is an inevitable trend in the development of textile production quality management.
Comprehensive detection to achieve full controllable
According to Dai Jun, deputy general manager of Jiangsu Yueda Textile Group, the evaluation criteria for yarn quality level have changed fundamentally in recent years. On the one hand, users pay attention to the quality of indicators, on the other hand, they pay more attention to the stability of physical quality and quality. consistency. Ni Shimin, senior engineer of Zhejiang Shuangda Textile, believes that the quality control includes quality improvement and quality stability. It is necessary to promote quality improvement on the basis of quality stability and promote quality stability on the basis of quality improvement. After the quality is improved, the quality is more important, and it is more difficult to achieve zero defects.
Therefore, Xu Wei, general manager of Wuxi Qingfeng Co., Ltd. believes that single spindle control, on-line inspection, simulated finished products, early warning pre-control, and best quality have become the development direction of spinning quality control technology. Using advanced testing instruments and control methods, the traditional control is improved and improved to meet the quality requirements of high-grade yarns in modern spinning production.  
In order to meet the requirements of users, Yueda Textile has explored how to use the functions of modern testing equipment in recent years, and comprehensively applied offline, online and expert systems to the quality management system to realize the use of offline detection to control the quality and quality of spinning. Fluctuation, a new system of spinning quality control that uses online technology to reduce the quality of weak loops and uses expert systems for quality monitoring. Optimize process equipment status and improve quality with advanced off-line instrumentation capabilities. Including the use of HVI to achieve scientific cotton blending; the use of AFIS to establish a semi-product process quality internal control mechanism; improve the monitoring of yarn quality by Uster UT4, UTJ4, improve the yarn quality fluctuations.
Use online detection technology to find the weak ring of quality and improve the stability and consistency of quality. With the development of textile production towards automation and intelligence, traditional off-line inspection has been unable to meet the needs of modern high-speed production. The offline inspection quantity only accounts for about one ten thousandth of the total product quantity, and the inspection quality level cannot accurately reflect the physical quality level. The application of full-process online monitoring technology has become the trend of modern textile development. On-line inspection performs 100% comprehensive inspection on products. By detecting, adjusting, monitoring, and alarming, products or non-conforming products can be eliminated in the production process. On-line testing also features quality analysis, statistics, product evaluation, etc., which can effectively combine inspection, analysis and optimized production to ensure automation of production and quality control. Online testing has certain advantages in saving production costs. Offline and online technology combine to improve yarn quality. Use expert systems to achieve quality monitoring and optimization, and improve overall quality management.
Yu Jianyong, vice president of Donghua University, said that the introduction of yarn quality inspection technology into textile processes can improve quality control and increase production efficiency. During the “Eleventh Five-Year Plan†period, some of the main spinning machines produced by some excellent textile machinery enterprises are equipped with testing devices, but most spinning enterprises consider the investment funds, and there are not many matching companies. The spinning enterprises that establish the ERP management system It is even rarer. Promoting the spinning process to produce fully automated, information-based detection and monitoring technology is conducive to improving labor productivity and, more importantly, to positively improving yarn quality and production efficiency. At present, it is necessary to adapt to the existing equipment process port, collect the operational data of the production site in real time, form a production management system through networking, and connect with the WRP system at the same time. Â
Technological means to help improve quality
In order to achieve comprehensive control in the spinning process, on the basis of traditional quality control, the means of quality control should be strengthened from the aspects of raw cotton, semi-products, yarn forming and winding, and the advanced testing technology of each link cannot be separated.
Computerized cotton technology has gone through decades of history and is still facing perfect promotion. On the one hand, because cotton has a wide range of sources and different quality differences, the company's respective product strategies are different. Computerized cotton is actually the collection and storage of raw cotton data. On the other hand, technological means have also been upgraded. At present, the main problem in the promotion process is that the information of raw materials in the acquisition is not comprehensive, the quality variation of the manufacturers in use is relatively large, and the cotton bales are also mutated during processing, and the product range is wide. The implementation of computerized cotton is mainly to obtain complete cotton basic data, and then establish a model to improve the accuracy of cotton blending.
High-precision heterogeneous fiber recognition yarn clearing technology is also a key technology. According to Yu Jianyong, the foreign fibers are mainly controlled at the raw material end and the winding end. After more than ten years of development, this technology has improved rapidly, but there is still a problem in completely replacing the artificial. The key to this technology lies in the application of higher-precision heterogeneous fiber identification mode and device for real-time detection of cotton flow; key equipment such as open cleaning cotton production line, feeding part in carding machine, and electronic yarn clearer on automatic winder The removal of the foreign fibers is carried out. The workload of picking up “three wires†is very large, and the combination of machine and labor will improve efficiency. As a new technical means, the heterogeneous fiber identification clearing technology can greatly reduce the labor intensity, but for high-quality products, it is difficult to identify the foreign fibers by machine. 
In the quality inspection process of textile products, the fabric inspection of the fabric is basically carried out by the full inspection method, and for the quality inspection of the yarn, since most of the inspections are destructive tests, only random sampling inspection can be used. Compared with the weaving engineering, the spinning unit has more spinning spindles. When sampling randomly, it is very likely that some spindles with quality defects will not be sampled for a long time, and the sample level will be The average quality of the yarn representing the overall level does not completely determine the quality of the fabric. Often, in a batch of cotton yarns with a good overall level, the defective products of individual packages will affect the quality and practical quality of the entire fabric. Accelerating the development of on-line inspection technology, improving the quality control of spinning production process, improving and perfecting the defects of traditional yarn quality inspection methods, and improving the quality of textiles are the direction of modern spinning production.
In-line inspection and automatic adjustment and automatic detection techniques have been used earlier in many processes in spinning engineering. For example, the automatic detection of the height of the cotton bale in the cleaning process, automatic detection and control of the storage capacity of the cotton box; the autoleveling system of the carding process and the online detection of the neps and impurities; the on-line detection and autoleveling system of the drawing process; the roving On-line monitoring system for machine spinning tension; automatic detection of broken ends in the spinning process and electronic yarn clearing and production monitoring functions of the winding process have successfully applied online detection technology. The combination of on-line detection and autoleveling achieves a closed loop of modern spinning production inspection and control. The combination of the combination and the leveling technology improves the length of the different lengths of the strips, such as the length of the strip, and the leveling technique can effectively eliminate the bonding wave, the drafting wave and the mechanical wave.
Xu Wei proposed that modern spinning production should not only have the instrument to test various yarn performance indexes, but also the practical quality effects of the latter products, such as simulating blackboard and fabric effects. Many well-known knitting factories in the world carry out yarn dyeing and dyeing inspection on yarns, dark yarn inspection yarns, dead cotton white stars and other indicators, dyeing and bleaching to check the quality of yarn dry, fine thick joints and foreign fibers. Another example is the dyeing factory. In addition to the instrument and blackboard inspection, yarn weaving inspection is also carried out to observe the quality of dry noodles, neps and thick sections.
In addition, in the modern spinning production system, the machine speed is getting faster and faster, the number of machines is getting less and less, and the loss of quality defects is more easily reflected. Therefore, it is more important to pre-control the pre-warning of each process. At the same time, from the adjustment of the raw materials in the spinning system, it is necessary to check the quality control degree from the system, and pre-control the quality trend of the spinning production through the influence of various performance indexes of the raw materials on the yarn quality.
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