With the wide application of modal, Tencel and other new cellulose fibers in clothing fabrics, customers have high requirements on the quality index of yarn produced by such fibers, even some small yarn defects are often intolerable. Therefore, spinning enterprises should seriously analyze the causes of small yarn defects, strengthen technical and management measures, and effectively reduce small yarn defects.
Basic definition and classification of yarn defects
Frequent yarn defects: frequent yarn defects refer to the details, slubs and neps tested by Uster Evenness Tester. The reference length of NEP is 1 mm, the length is not more than 4 mm, and the sensitivity is generally set as + 140%, + 200%, + 280%; The detection length of coarse section is about the average fiber length, and the sensitivity is generally set at + 35%, + 50%; The length of the detail is about the average fiber length, and the sensitivity is generally set at - 30%, - 40%, - 50%.
