The micronaire value is a measure of the air permeability of a certain amount of cotton fiber under specified conditions. It is expressed on a micronaire scale and has no unit. The micronaire scale is based on the set of “International Calibration Cotton Standards” whose micronaire values have been determined by international agreement.
The micronaire value is a comprehensive indicator of the linear density and maturity of cotton fiber. For cotton fibers of the same variety, the larger the micronaire value, the more mature the fiber and the greater the linear density. The micronaire value is closely related to cotton textile technology and yarn quality. Cotton fiber with high micronaire can withstand mechanical impact, is easy to remove impurities, has uniform yarn dryness, smooth appearance, few defects, and high finished product yield. However, if the micronaire value is too high, the fiber will have less natural twist and weak cohesion. The number of fibers per unit linear density of the yarn will be small, and the yarn strength will be low. Cotton fibers with too low micronaire value will easily produce harmful defects and dyeing. Poor sex and high breakage rate. Internationally, cotton fiber with a micronaire value of 3.5 to 4.9 is regarded as a normal micronaire grade cotton fiber. my country’s fine-staple cotton, long-staple cotton, and colored cotton standards also regard cotton fibers with a micronaire value of 3.7 to 4.2 as Class A (high-quality) micronaire cotton fibers.
The micronaire value of cotton fiber is a comprehensive reflection of fiber fineness and maturity. Different maturity levels will not only cause changes in fiber properties, but also have a great impact on the yarn process, quality and fabric quality. , the micronaire value of cotton fiber can be used as a comprehensive index to evaluate the intrinsic quality of cotton fiber, which directly affects the color, strength and fineness of the fiber. strength, naturalness, elasticity, moisture absorption, dyeing, etc.; Lint cotton with a long growth period and overmature fiber has thicker fibers and is not suitable for spinning mid- to high-grade cotton yarn. Lint cotton with a micronaire value in the range of 4.1~4.3 has a shorter growth period. It is immature and has a relatively low relative content rate, but the fiber fineness is fine, the fiber count is high, the yarn cross-section has many fibers, and the strength is high, and it can spin medium and high-grade cotton yarn.
1. The classification of micronaire value in fine lint cotton standards:
Clone values are divided into three levels: A, B, and C. Level B is the standard level. The value range of grade A is 3.7-4.2, which indicates good quality; the value range of grade B is 3.5-3.6 and 4.3-4.9; the value range of grade C is 3.4 and below and 5.0 and above, which indicates poor quality. It is divided into 5 levels in total, see Table 3-10.
2. Inspection method of micronaire value of seed cotton
Sensory inspection can be used when purchasing The inspection method and sensory inspection results are compared with the inspection results conducted in GB/T6498. Is micronaire worth it?as an assessment indicator.
3. Micronaire test method for bales of lint cotton
(1) From the batch Among the samples, micronaire test samples are randomly selected based on 30% of the batch sample quantity, and the micronaire value is tested one by one. The micronaire test method is implemented in accordance with GB/T6498.
(2) For each test sample, the micronaire level is determined based on its micronaire value. The percentage of each micronaire level is calculated, and the micronaire level with the largest percentage is determined as the main micronaire level of the batch of cotton.
(3) The inspection results are certified based on the subject’s micronaire level and the percentage of each micronaire level.
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