Corrected invoice weight of textile material:
When the yarn manufacturer purchases the fibres from the supplier and pays the price of fibres by weight, it is necessary to sign an agreement between buyer and supplier to generate an invoice of exact weight. Any buyer does not wish to pay for an excess amount of moisture present in the textile material. A correct invoice weight is therefore determined. When a consignment is delivered and weighed a sample is taken and tests made to enable the correct invoice weight to be calculated. First of all, dry-oven weight is found. This dry-oven weight may be determined either with or without cleaning the sample before taking it to constant weight in the drying oven.
Suppose that
W = the weight of consignment at the time of sampling
d = oven-dry weight of the sample ( either with or without cleaning
S = original weight of the sample
C = oven-dry weight of the consignment
If a blended sample is considered, and the relative proportion of each component is known, the allowance can be calculated as below:
Example: If the blend is 80:20 cotton/nylon, the allowance will be calculated as below:
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