Yarn Count Conversions and Direct Mass Calculations for Woven Goods
Accurate woven mass calculation requires modeling yarn counts, crimp percentages, sizing removal, and moisture regain across every step from loom shed to final invoice.
Desizing Loss
Quantitative Measurement
Measurement of the weight removed from a fabric after the sizing agent is washed away. Quality inspectors calculate desizing loss to verify that the protective starch or polymer has been completely eliminated before dyeing. This measurement is expressed as a percentage of the original greige fabric weight.
Removal Efficiency
Comparison of the fabric weight before and after the scouring process reveals the effectiveness of the enzymes or chemicals used. If the loss is lower than the amount of size originally applied, residual chemicals may remain on the yarn. These residues can block dye molecules from reaching the fiber, causing uneven color.
Chemical Treatment
Industrial washers use specific temperatures and pH levels to break down the sizing materials into soluble components. The duration of the wash must be sufficient to allow the chemicals to penetrate the dense weave of the cloth. Excessive treatment can damage the underlying fibers, while insufficient treatment leaves the fabric stiff.
Material Impact
Final weight of the fabric is directly influenced by the amount of material removed during this stage. A mill must account for this reduction when calculating the final yield of a production run. The boundary of this measurement is the natural wax and pectin content of the fiber, which may also be removed during the scouring process.
Accurate tracking of this weight change is necessary for precise cost accounting.