The fair weight is the weight of the quasi-weight converted by the fair moisture return rate of cotton. Calculation method is: gross weight minus the weight of the packaging (tare) to get the net weight, net weight according to the standard moisture content rate after deducting to get the actual moisture rate under the quasi-weight, quasi-weight according to the fair moisture rate after conversion to get the fair weight. The calculation formula is as follows.
ⅰ net weight = gross weight - packaging weight
ⅱ quasi-weight = net weight * (100 - the actual rate of impurity) / (100 - standard rate of impurity)
ⅲ public weight = quasi-weight * (100 + cotton public moisture return rate) / (100 + cotton actual moisture return rate)
National standard: standard impurity rate of 2.5% for sawtooth cotton; cotton public return rate of 8.5%.
The standard rate of impurity of lint roller cotton is 3.0%.
For example: a batch of cotton gross weight of 20 tons, the weight of the packaging for 100 kg, after inspection, the actual rate of impurity is 3%, the actual moisture rate of 10%, then this batch of cotton public weight of 19.5 tons.
Will i, ⅱ formula substituted into ⅲ:
Then the nominal weight = (20,000-100) * (100-3) / (100-2.5) * (100 + 8.5) / (100 + 10) = 19,528 ≈ 19.5 tons.
Supplementary: the weight difference between imported cotton and national cotton
Imported cotton is generally settled on a CIF net weight basis, so the same price of national cotton and imported cotton due to the different representative weight, the actual cost price will be different.
Assume the same moisture rate of 6%, containing 1.5% of the net weight of a ton of national cotton and imported cotton. The difference in price is.
1）Imported cotton valuation basis: 1 ton
(2) national cotton valuation basis (metric weight): 1x (100-1.5)/(100-2.5) x (100 + 8.5)/(100 + 6) = 1.034 tons
As can be seen from the above calculation, the same price of national cotton with imported cotton due to the difference in weight so that imported cotton appears to have more advantages. In fact, the U.S. cotton, Australian cotton in finishing are dried and ginned, the return rate is lower compared to the national cotton; for machine-picked cotton, cotton impurities are mainly leaf weeds, the specific gravity is light, containing a lower rate of impurities than the national cotton. Therefore, the actual weight benefit of imported cotton is generally greater than 3.4%
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