Numbers 328 and 429 are preceded by grades and followed by lengths. At present, the fiber lengths of upland cotton and island cotton varieties produced in major cotton regions in China are mostly 25-3 1mm and 33-39mm respectively. The length of cotton fiber refers to the length between the two ends of the fiber after straightening, which is generally expressed in millimeters. The length of cotton fibers varies greatly. The longest fiber can reach 75 mm, and the shortest fiber is only1mm. Generally, the fiber length of fine cotton is 25-33 mm, and that of long-staple cotton is more than 33 mm. The length of cotton fibers in different varieties, different cotton plants and different cotton bolls varies greatly, even among cottonseed in different petals of the same cotton boll and even at different grain positions of the same cottonseed. Generally speaking, the boll fiber in the lower part of cotton plant is shorter, the boll fiber in the middle part is longer, and the boll fiber in the upper part is between the two; In the same boll, the fiber attached to the cottonseed in the middle of each petal is longer. Cotton fiber length is one of the important indexes of fiber quality, which is closely related to spinning quality. Under other conditions with the same quality, the longer the fiber, the higher the spinning count.

Algorithm for transforming seed cotton into lint;

The calculation process will be briefly described as follows:

Take 1 kg seed cotton as an example. The unit price of seed cotton is 2. 15 yuan/kg, the lint percentage is 38%, the loss rate is 1%, and the clothing loss rate is 1% (the clothing loss rate here is relative to the number of seed cotton). The purchase price of cottonseed is 0.6 yuan/kg, and the processing fee is 0.25 yuan/kg.

Overturning formula:

Acquisition cost of seed cotton = acquisition quantity × unit price of seed cotton =1× 2.15 = 2.15 yuan.

Cottonseed cost = (1- lint percentage-loss rate) × unit price of purchased cottonseed = (1-0.38-0.01)× 0.6 = 0.366 yuan.

1. If the macro calculation (excluding clothing defective rate and processing fee):

The converted leather coat cost = (seed cotton acquisition cost-cottonseed cost)/clothing percentage = (2.15-0.366)/0.38 = 4.6947 yuan/kg.

Cost per foreskin = converted lint cost ×100 = 4.6947×100 = 469.47 yuan/bag.

Cost per ton of lint = cost per load of lint × 20 = 469.47× 20 = 9389.40 (yuan/ton)

Second, if you calculate the cost (calculate the rate of defective clothing and processing fees)

The converted actual fur coat cost = (seed cotton cost-cottonseed cost)/(lint percentage-loss rate)+processing fee = (2.15-0.366)/(0.38-0.001)+0.25 = 5.07/kloc-0.

Cost per foreskin = converted actual lint cost ×100 = 5.0716×100 = 507.16 (yuan/bag)

Cost per ton of lint = cost per load of lint × 20 = 507.16× 20 =10143.20 (yuan/ton)

Now the purchase price of seed cotton is above 6.5, just change the number.

I still have this document from a few years ago.