The occasional yarn defects are mainly divided into four types: cotton knot (n), short coarse section (s), long coarse section (L) and detail (T), and branch deviation (C, CC), etc. it is usually expressed by the number of occurrence on every 100000 meters yarn. Cotton knot (n) refers to the short coarse section below 1 cm; Short coarse section (s) refers to 1-8 cm thick section; Long and thick nodes (L) refer to the coarse joints more than 8 cm; T is the detail. The probability and quantity of frequent yarn defects and occasional yarn defects are different, and the influence on the back track is different, and the causes are also different.
The frequency of frequent yarn defects is higher, the length and cross-section area of yarn defects are relatively small. Compared with occasional yarn defects, the influence on fabric quality is small. However, if the number of frequent yarn defects is too many, it will also have a serious impact on fabric fabric fabric fabric fabric fabric style.
Although the probability of occasional yarn defects is relatively small, it is harmful to fabrics. These defects are usually caused by poor production management, poor operation and unreasonable process design.
