Yarn Part 5: Quality Assessment of Polyester-Cotton Blended Yarn

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Quality evaluation of combed polyester-cotton blended yarn: superior products are based on single yarn strength variation coefficient CV (%), 100-meter weight variation coefficient CV (%), evenness, blackboard nep number, 100,000 The lowest grade among the five items of rice yarn defects is evaluated; first, second, and third-class products are evaluated according to the lowest grade of the first four items among the superior products. Grade evaluation of strands: Superior products are based on the lowest of the four coefficients of variation coefficient of single yarn strength CV (%), coefficient of variation of weight per 100 meters CV (%), evenness coefficient of evenness, and blackboard nep count. Evaluation; first- and second-class products are evaluated based on the lower one among the three factors: CV (%) of single yarn strength, CV (%) of weight per 100 meters, and nep count on the blackboard.
Quality evaluation of carded polyester-cotton blended yarn: superior products are based on single yarn strength variation coefficient CV (%), 100-meter weight variation coefficient CV (%), evenness, blackboard nep number, blackboard nep impurity total The grade of the first- and second-class products shall be evaluated by the lowest grade among the six items of grain number and yarn defects of 100,000 meters; the first and second-class products shall be evaluated by the grade of the lowest among the first five items among the excellent products. Grade evaluation of strands: high-quality products are evaluated by the lowest of the first five items. First- and second-class products are evaluated based on single yarn strength variation coefficient CV (%), 100-meter weight variation coefficient CV (%), and blackboard neps. The product is evaluated by the lowest one among the four items, including the number of neps and the total number of neps and impurities on the blackboard. Spinning yarn (5): Quality evaluation of polyester-cotton blended chemical fiber fabric yarn

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