{"id":5082,"date":"2024-04-25T16:11:30","date_gmt":"2024-04-25T08:11:30","guid":{"rendered":"https:\/\/www.textile-fabric.com\/archives\/5082"},"modified":"2024-04-25T16:11:30","modified_gmt":"2024-04-25T08:11:30","slug":"popular-science-how-to-judge-the-quality-of-cotton","status":"publish","type":"post","link":"https:\/\/www.textile-fabric.com\/?p=5082","title":{"rendered":"Popular Science | How to judge the quality of cotton?"},"content":{"rendered":"
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Main assessment indicators of cotton quality: The main indicators are: grade, length, micronaire value, moisture regain, impurity content, and hazardous debris.
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1. Cotton transaction method<\/section>\n
(1) Based on the sample: mainly in West Africa and used in India.

(2) Port size The quality of the bulk cotton goods shall be confirmed on the spot after the cotton arrives in the bonded area.

(3) American General Standard : Mainly used in the United States and Brazil. US General Cotton Standard:

Level Divided into GM, SM, M, SLM, LM, SGO, GO, BO

(GM=Level 1 SM=Level 2 M=Level 3…)

Fiber length grading:
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2. Micronaire value
The micronaire value of cotton fiber is a comprehensive reflection of fiber fineness and maturity. The micronaire value of cotton fiber can be used as an evaluation\ufffdA comprehensive indicator of the intrinsic quality of cotton fiber, which directly affects the color, strength, fineness, naturalness, elasticity, moisture absorption, dyeing, etc. of the fiber.
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2. Macron value
The micronaire value of cotton fiber is the fiber fineness and a comprehensive reflection of maturity. 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, fineness, naturalness, elasticity, moisture absorption, dyeing, etc. of the fiber.
Micron value It is divided into three levels: A, B, and C. Level B is the standard level.

3. Moisture regain rate: moisture regain Ratio refers to the percentage of moisture contained in cotton to the weight of the fiber. The public standard moisture regain of cotton is 8.5%. In actual work, the moisture regain of raw cotton is generally determined by the electric detector method.

4. Impurity content: The national standard impurity content of sawtooth cotton is 2.5%.

5. Cotton is classified as follows \uff1a<\/section>\n
\uff081 ), according to physical form, cotton is divided into seed cotton and lint. The cotton picked by cotton farmers from the cotton trees is called seed cotton, and the cotton after seed removal is called lint. Cotton in the usual sense refers to lint.

(2), according to length Cotton is divided into long-staple cotton and fine-staple cotton. The length of fine-staple cotton is generally 25-31 mm, and the length of long-staple cotton is more than 33 mm. Cotton in my country is mainly fine-staple cotton.

(3), press Process Mechanically, cotton is divided into saw-tooth cotton and roller cotton. The lint produced using a saw-tooth gin is called saw-tooth cotton, and the lint processed using a roller gin is called top-roller cotton. At present, the vast majority of cotton in my country’s cotton market is sawtooth cotton.

(4), press cotton Depending on the color, cotton is divided into white cotton, yellow cotton, gray cotton and colored cotton.

(5), press cotton Different grades, cotton is divided into high-gradehigh grade cotton and low grade cotton.

6. Cotton inspection in my country Method: <\/section>\n
With Sensory testing is mainly used, and instrumental testing is supplemented. The grade, length, foreign fiber and neps are subject to sensory inspection, and the micronaire value, moisture regain, impurities and short fiber rate are subject to instrumental testing. The order of checking is:

Sampling – Check moisture regain – Check impurity content – Check grade – Check length – Check micronaire – Check abnormal fibers – Check neps – Check short fiber rate. (8 items)<\/section>\n

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