The quality of cotton yarn directly determines the quality of cloth

Main indicators of cotton yarn rating:

1. Single yarn breaking strength variation coefficient

2. Weight variation coefficient per 100 meters

3. Evenness

4. Number of neps in one gram

5. The total number of nep impurities in one gram

6. One hundred thousand meters of yarn defects

Cotton thread rating basis: 1.2.4.5.

Rating method: Based on the lowest one from 1 to 5, and then see if 1.2. is out of range. Regardless of whether one or two items are exceeded, it will be downgraded to first level and second level. to this end. For high-quality cotton yarn, an additional 100,000 meters of yarn defects are added as a grading indicator.

1. Single yarn (thread) breaking strength and breaking strength variation coefficient

Single yarns are measured 60 times and strands are measured 30 times. It can be obtained by substituting into the coefficient of variation formula. The formulas for n>50 or n<50 are different.

2. Weight variation coefficient per 100 meters

30 yarns, 1 meter long per week, 100 weeks. 30 are weighed separately and substituted into the coefficient of variation formula. Accordingly, search the product, etc. in the technical specification table.

3. Weight deviation per 100 meters

Actual features and design features

The deviation percentage between the two is called weight deviation or special number deviation. The actual evaluation is measured by the weight deviation of 100 meters.

4. Evenness

Either the coefficient of variation of evenness (measured with an electronic evenness meter) or the blackboard evenness may be adopted. When there is a dispute, the former shall prevail. Determination of dry uniformity of blackboard strips: Randomly select 10 tubes, shake 10 blackboards evenly, each
250mmx220mm, compare them with the dry standard sample in turn under the specified finishing line, and evaluate them respectively according to their shadows, thick spots, serious defects, serious regular unevenness, etc. Those that are better than or equal to excellent will be rated as first class, those that are better than or equal to first class will be rated as first class, those that are worse than first class or have serious defects will be rated as second class, and those with serious irregularities will be rated as third class. Finally, based on the proportion of excellent, first-class, second-class and third-class among the 10 blackboards, the evenness of the blackboards is determined.

5. The number of neps in 1g and the total number of neps and impurities in 1g

The number of neps and impurities within 10 spaces of the positive and negative points, the total number of neps na and the total number of neps and impurities nb within 10 blackboards can be calculated as follows:

The number of neps in 1g=na/
Ntex x10

The total number of neps and impurities in 1g=(
na+nb)/Ntex x10

6. One hundred thousand meters of yarn defects

Yarn defects refer to major defects attached to the spinning yarn, which are divided into short slubs (more than 100% thicker than normal and less than 200px in length) and long slugs (more than 45% thicker than normal, There are three categories: length greater than 200px) and long thin knots (30~70% thinner than normal, length greater than 200px). Affect the quality of the cloth surface and cause short ends. The inspection requires a large sample size, otherwise it will be difficult to detect, so a length of 100,000 meters was taken. Carry out on yarn defect meter.

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