Evaluation method of cotton yarn quality

Yarn quality evaluation includes internal quality and appearance quality:

Basically, it is based on physical indicators and appearance defects. However, the physical index items and appearance defect items are different for different types and different uses of yarns.

Yarn quality standards include national standards (approved and issued by the National Science Committee), Ministry standards (approved and issued by the Ministry of textile industry) and enterprise standards (formulated by provincial and municipal industrial departments).

The basis and grading of common Polyester Filament Yarn quality evaluation are as follows:

Quality evaluation of cotton yarn

Cotton yarn refers to cotton yarn. The production capacity of three shifts a day and night is taken as a batch for evaluation.

Items of cotton yarn rating

1. Single yarn breaking coefficient of variation

2. Variation coefficient of 100 meter weight

3. Evenness of sliver

4. Number of neps per gram

5. Total number of NEP impurities in one gram