Yarn (3): Quality assessment of cotton yarn

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① The grades (or grades) of cotton yarn (thread) are divided into first-class, first-class, and second-class products according to quality standards, and products lower than second-class are classified as third-class products.
② There are 5 quality indicators for grading cotton yarn, namely single yarn breaking strength variation coefficient, quality variation coefficient per 100 meters, evenness, number of neps in 1g and total number of neps and impurities in 1g. When If the quality of the five items is different, the lower one among the five items will be used to determine the grade.
③ There are 4 quality indicators for grading cotton threads, namely the coefficient of variation of single yarn breaking strength, the coefficient of variation of quality per 100 meters, the number of neps in 1g and the total number of neps and impurities in 1g. When the grades of the 4 items are different , rated according to the lower one of the 4 items.
④ When the breaking strength of a single yarn (thread) or the quality deviation per 100 meters exceeds the agreed range, the single yarn (thread) breakage coefficient of variation and the quality variation coefficient per 100 meters will be downgraded by one level based on the original evaluation, such as item 2 When they are all out of range, they will only drop down once, until they are downgraded to the second level.
⑤For high-quality cotton yarn, an additional 100,000 meters of yarn defects is used as a grading indicator.
⑥ You can choose one of the blackboard evenness and coefficient of variation of evenness, but once determined, it cannot be changed arbitrarily. In case of quality disputes, the coefficient of variation of evenness shall prevail. Spinning Yarn (3): Quality Assessment of Cotton Yarn

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