Contractual Weight Tolerance Bands and Yield Risk Allocation in Bulk Fabric Procurement
Contractual weight tolerance bands govern linear yardage yield, moisture regain adjustments, and cutting room markers to protect garment cost margins.
Desize Mass Loss
Quantitative Evaluation
Chemical solubilization and removal of protective sizing polymers from woven warp yarns reduce dry fabric weight before dyeing. Desize mass loss measures the percentage difference in dry substrate mass before and after enzymatic or chemical desizing operations. The calculation governs preparation quality in woven fabric processing and stops applying once unfixed sizing agents are fully extracted or when processing knits that bypass warp sizing.
Laboratory verification isolates starch, polyvinyl alcohol, and acrylic size fractions to ensure complete removal without cellulolytic attack on raw cotton fibers.
Chemical Breakdown
Enzymatic amylase baths selectively hydrolyze alpha-1,4-glucosidic bonds in native starch without degrading adjacent cellulosic chains. If desize mass loss falls below target limits, residual size forms a hydrophobic barrier that prevents uniform dye penetration. Cold water rinsing removes water-soluble polyvinyl alcohol fractions efficiently.
Process Parameter
Refractometer readings of wash liquor complement dry mass measurements during continuous range operations. High desize mass loss confirms thorough liquor penetration and effective thermal desizing in steam chambers. Processing facilities adjust surfactant dosages when synthetic sizes resist hot water extraction.
Commercial Implication
Downstream fabric absorbency directly reflects the thoroughness of sizing removal prior to bleaching. When desize mass loss matches formulation targets, subsequent dyeing displays superior levelness and batch consistency. Buyers require verified mass loss figures before accepting loom-state woven goods for continuous dyeing runs.