Gravimetric Calculation
Moisture adjustment calculations convert the weighed mass of wet linen shipments into a standardized commercial dry weight. An analyst applies the dry mass correction factor to align the raw weight recorded at the receiving dock with the contractually agreed moisture regain value. This conversion ensures that buyers only pay for actual fiber material rather than absorbed water.
Adjustment Procedure
Oven drying tests begin by heating representative yarn samples in a ventilated oven at one hundred and five degrees Celsius until a constant weight is achieved. Once the absolute dry mass is recorded, the dry mass correction factor is computed using the legal moisture regain percentage which is usually set at twelve percent for linen. This multiplier translates the invoice weight directly into the clean commercial weight.
A higher moisture level in the incoming bales results in a lower multiplier, which reduces the final billable weight. Spinning mills require this adjustment to prevent financial losses from wet bales stored in high humidity warehouses.
Operational Limit
Limits of this mathematical adjustment appear when fibers contain high levels of non-cellulosic impurities. Because the dry mass correction factor assumes a uniform moisture absorption profile, the presence of excessive pectin or shive distorts the rate of moisture loss. Specialty flax fibers with high residues must undergo chemical extraction before accurate moisture corrections can be verified.
