Xiao Bian today to analyze how to distinguish the quality of cotton yarn ~
The main indicators of cotton yarn rating:
1. Single yarn breaking strength coefficient of variation
2. 100m weight variation coefficient
3, dry evenness
4, one gram of cotton grains
5, a gram of neat impurity total grains
6. One hundred thousand meters of yarn
Cotton rating basis: 1.2.4.5.
Appraisal method: According to the lowest one of 1 to 5, wait and see if 1.2. Is out of range, regardless of one or two exceeds, all drop down and drop to the second. Excellent cotton yarn plus 100,000 meters of yarn is used as a grading indicator.
1. Single yarn (line) breaking strength, breaking strength coefficient of variation
The single yarn was measured 60 times and the strands tested 30 times. Substituting the coefficient of variation formula can be obtained. The n>50 or n<50 formula is different.
2. 100m weight variation coefficient
30 yarns, 1 meter per week, 100 weeks. 30 Weigh separately and substitute the coefficient of variation formula. Based on this, look up the product in the specification table.
3. 100 meters weight deviation
Actual special number and design number
The percentage of deviation between the two is called the weight deviation or the special number deviation. The actual assessment is measured by the hundred-meter weight deviation.
4. Dryness uniformity
Either the coefficient of variation of the evenness of the strip (measured with an electronic homogenizer) or the uniformity of the dryness of the black stripe may be used. When there is a dispute, the former shall prevail. Blackboard strip evenness measurement: 10 randomly selected bobbins, evenly shake 10 blackboards, each 250mmx220mm, in accordance with the provisions of the light, followed by the standard sample photos in order, according to its shadow, thick section, serious defects Severe irregularities, etc., were assessed separately. Better than or equal to excellent is rated as excellent, better than or equal to first-class, inferior to first-class or severely inferior as second-class, and severely irregular in regularity as third-class. Finally, according to the proportions of the top ten, the first, the second, and the third among the ten blackboards, the evenness of the bars is determined.
5. The number of 1g cotton neps and the total number of 1g inner neat impurities
The number of neps pellets and trash pellets in the 10 positive and negative points, the total number of neps na and the nb impurity total nb in the ten boards can be calculated as follows:
1g number of cotton neps = na/ Ntex x10
1g Total Neps Impurities = (na+nb)/Ntex x10
6. One hundred thousand meters of yarn
The yarn defect refers to the major defects attached to the yarn, which are divided into short thick sections (more than 100% thicker than the normal, less than 200px in length), long thick sections (greater than 45% thicker than normal, and lengths greater than 200px), and long thin knots ( 30 to 70% finer than normal and greater than 200px). Affect the quality of the fabric, causing short head. The test requires a large sample size, otherwise it is not easy to find, so take 100,000 meters long. It is done on the yarn gauze.
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