Impurity content and defect rate of raw cotton
(1) Impurity content of raw cotton: The standard impurity content of cotton, top roller cotton is 3.0%. Sawtooth cotton is 2.5%. The impurity content of raw cotton is usually calculated using a raw cotton impurity analysis machine. It takes a sample of a certain weight to pick out coarse impurities and feeds it into the machine. After being combed and loosened by the saw teeth of the licker-in, the fibers and impurities are separated under the action of machinery and airflow. The impurities are weighed and calculated to obtain the impurity content of the raw cotton. Rate. The calculation formula is: Where: Z – impurity content; F – mass of impurities picked by machine, g; C – mass of coarse impurities picked by hand, g; S – mass of sample, g. (2) Crazy point rate: Raw cotton shelter points are formed due to poor growth and poor rolling. Common raw cotton defects include: neps, cords, fibrous seed scraps, soft seed skin, infertile seeds, stiff flakes, yellow roots, etc. The defect rate of raw cotton is usually expressed as the defect mass percentage and the number of defects per 100 grams. Generally, the manual picking method is used to calculate the number of particles and mass percentage of the above-mentioned defects in the 100g sample, and then add the number of particles per 100 grams and the mass percentage of each defect to obtain the total number of defects per 100 grams. Particle number and total mass percentage. The number of defective grains is counted as an integer; the calculation result of the total mass percentage of defects is rounded to two decimal places according to the numerical rounding rules. The calculation formula is as follows:
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