Improvement of yarn quality is inseparable from technical means（1）
In the past two decades, the level of spinning quality of yarn and thread have made rapid progress, and the requirements for yarn quality have been constantly improved.
Pursuing zero defect and flawless production and continuously improving the internal and external quality of products of thread are the production mode of modern enterprises of yarn which pursue the combination of high quality and high efficiency.
It requires not only high internal and external quality of thread, but also high efficiency of weaving production in the back channel.
For example, the production mode of "light-out production and continuous weaving" puts forward high requirements for thread 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 key equipment quality provides guarantee for the improvement of spinning quality level.
It is reported that in the past, the unevenness of CJ14.6 tex is less than 14%, which can be said to be the advanced level in the industry.
At present, 11% is the normal level, and the high level has reached less than 10%.
Nowadays, the widely used optical, mechanical, electrical, pneumatic and hydraulic sensing technology and frequency conversion technology have promoted the development of spinning technology of yarn towards automation, intelligence and continuity, not only improving production efficiency and labor productivity, but also creating conditions for the modernization, systematization and scientificalization of quality management means, which is the inevitable trend of the development of textile production quality of yarn management.
Comprehensive detection to achieve full controllability
The evaluation criteria of yarn quality level have changed fundamentally in recent years.
Users pay more attention to the quality of indicators on the one hand, and the stability and consistency of physical quality on the other.
It believes that the connotation of quality of yarn control includes quality improvement and quality stability.
We should promote quality improvement on the basis of quality stability on the basis of quality improvement.
After quality improvement, quality stability is more important, and it is more difficult to achieve zero defect.
Therefore, we believes that single spindle control, on-line detection, simulation of finished products, early warning and pre-control, and optimal quality become the development direction of spinning quality of yarn control technology.
Advanced testing instruments and control means are used to improve the quality of high-grade yarn in modern spinning production on the basis of traditional control.
（to be continued）
