1. Cotton yarns are specified in batches of three classes of the same variety for one day and night, tested according to the specified test period and various test methods, and the cotton yarn products are evaluated according to the results.
2. The quality of cotton yarns is divided into superior, first-class, second-class, etc. Those who are lower than the second-class indicators are third-class, also called external.
3. The quality of the cotton yarn, such as the single yarn breaking strength coefficient of variation CV (%) and the 100-meter weight coefficient of variation CV (%), the uniformity of the strip and the number of cotton granules in one gram and the total number of impurities in the nip. When the five items are different, the lowest one of the five items is evaluated.
4. The quality of the cotton thread is evaluated by the single-line breaking strength coefficient of variation CV (%), the 100-meter weight coefficient of variation CV (%) and the number of gram of cotton in one gram and the total number of impurities in one gram of neps. When the products are different, the lowest one of the four items is evaluated.
5. When the breaking strength or the deviation of the weight of the single yarn (line) exceeds the allowable range, based on the single yarn (line) breaking strength coefficient of variation CV (%) and the 100-meter weight coefficient of variation CV (%) original evaluation, etc. If you want to go down one way, if the two are out of range, you will only drop once. Drop to second class.
6. Excellent cotton yarn plus 100,000 meters of yarn is also used as a grading indicator.
7. Inspection strip uniformity Any one of the board's dryness uniformity or the strip uniformity coefficient of variation CV (%) may be selected by the manufacturer. However, once determined, it shall not be arbitrarily changed. When a quality dispute occurs, the coefficient of variation of the strip uniformity CV (%) shall prevail.
8. The cotton yarn weight deviation monthly cumulative, should be weighted average according to the output, the production of more than 15 batches of the whole month, should be controlled within 0.5% of the soil.
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