Polymer Efficiency
Polyvinyl alcohol modified starch size coats flax yarns during the sizing phase of linen production in Chinese mills to prepare warp threads for high tension on projectile weaving looms. The sizing bath mixture combines etherified potato starch with fully hydrolyzed polyvinyl alcohol at strict weight ratios to control hairiness and improve abrasion resistance during shedding. Chinese export mills record these preparation parameters in daily production logs that accompany every lot to overseas buyers.
Solution Viscosity
Temperature management governs the fluid properties of the sizing liquor as it circulates through the stainless steel applicator trough before yarn immersion. Technicians monitor the Brookfield viscosity continuously to ensure the protective film penetrates the core of the flax yarn rather than sitting only on the surface. Viscosity values exceeding standard thresholds cause excessive stiffness in the dried warp, which leads to filament breakage during subsequent reed beating.
Weaving Retention
Residual size loading on the woven greige fabric must remain within specified limits to prevent interference with alkaline scouring and peroxide bleaching stages in finishing plants. Laboratory tests dissolve the starch coating from small fabric samples using enzymatic amylase digestion to calculate the exact percentage of dry matter removed. Acceptance criteria differentiate strictly between raw material quality and process efficiency, ensuring that weak yarn strength stems from natural fiber variation rather than faulty starch application.
