Reconciling Scouring Mass Loss and Wet Contraction in Landed Linen Fabric Costing
Landed linen costing requires dividing greige linear price by the net length yield factor while netting out chemical scouring mass loss from gross roll weight.
Degree of Polymerization Cellulose
Polymer Chain Metric
Cellulose chain length reduction dictates the mechanical capacity of processed bast fibres during wet spinning stages in eastern provincial mills. Degree of polymerization cellulose measures the average number of anhydroglucose units within a single macromolecule of the plant material extracted from flax stalks. Higher numerical counts denote unbroken molecular backbones that withstand heavy mechanical tension exerted by high speed drafting frames on the wet spinning floor.
Chemical degradation occurs during alkaline boiling and bleaching steps when hydroxyl radicals attack glycosidic bonds and shorten the molecular chains. Fluidity tests performed on cupriethylenediamine solutions provide the laboratory values recorded in the mill technical dossier for every commercial batch.
Acceptance Threshold
Buyer quality specifications establish strict lower limits for macromolecular chain dimensions before yarn lots clear final inspection for export. Mill technical directors maintain internal processing tolerances that sit safely above the contractual minimum accepted by overseas textile importers. Excessively degraded cellulose fails to develop sufficient tensile strength when wet, leading to frequent filament breakage during high speed ring spinning operations.
Verification documents accompany each pallet of yarn to confirm that molecular retention stays within acceptable trade limits.
Viscosimetric Index
Intrinsic viscosity measurements convert efflux times from capillary viscometers into the numerical values required for industrial grading. Technicians dissolve prepared fibre samples in standardized solvents under controlled temperature conditions to observe fluid flow characteristics. Molecular weight calculations derive directly from specific viscosity increments plotted against known concentration gradients of the dissolved plant polymer.
Plant floor supervisors monitor these calculated metrics to adjust chemical concentrations during preliminary scouring vats and prevent excessive degradation.