Eight indicators of good or bad cotton
1: Hazardous debris: refers to the raw cotton contains harmful impurities such as heavy metals and other content.
2: raw cotton impurity rate: raw cotton impurities refers to the raw cotton, such as sand, leaves, bell shell, soft seed epidermis and other non-hazardous debris.
3: Cotton grade: According to the quality of cotton rolling, color characteristics, maturity, cotton grade is divided into seven levels, namely, one to seven. Three levels for the level of standard grade. Below the seven-level outside the cotton.
4: Micronaire value: This is a comprehensive index reflecting the degree of maturity and fineness of cotton. The standard stipulations are divided into A, B and C three levels, and the standard level is B level. A grade is superior to B grade, B grade is superior to C grade.
5: cotton fiber length: refers to the length of the cotton fiber after straightening. Cotton fiber length (referred to as length, the same below) to 1mm for the pitch. Grade 5 Cotton 27 mm in length over 27 mm, and 6 and 7 mm in 25 mm.
6: Nep: Nep is the knot of cotton fiber, the serrated cotton is no more than 500 grains per hectogram, and the standard grade is not more than 700 grains per hectogram. The standard below is not required. Nep results in a drop in the amount of fabric and other defects.
7: Nominal moisture regain: refers to the moisture contained in cotton and dry fiber as a percentage of the weight. This is different from the water content. Moisture content refers to the moisture content of cotton and wet fiber as a percentage of weight. Cotton regulates the moisture regain of 8.5%; cotton regains the maximum of 10.5%.
8: staple fiber rate: cotton staple fiber rate is an important indicator of cotton quality, its size is directly related to the quality of the textile and the production rate. The percentage of the total weight of the fiber in the length of cotton fiber less than a certain length, the percentage of the total weight of the fiber should be less than or equal to 12% and the maximum should not exceed 18%; Grade level and the next Grade (ie 3, 4) cotton should be less than, equal to 15%, the maximum shall not exceed 20%; other grades of cotton is not required.