Molecular Sizing
Etherified botanical polymers applied during flax yarn preparation provide the tensile reinforcement necessary for high-speed loom operation in Chinese textile mills. Warp sizing modified starch creates a protective polymeric film around individual staple fibres, reducing hairiness and preventing abrasive rupture during repetitive shed cycling. Industrial processors dissolve granular powders in heated aqueous baths before dual-nip immersion and subsequent forced-air drying.
Solution viscosity dictates film thickness and penetration depth, requiring precise temperature control during liquefaction phases. Fluid dynamics within the size box govern pick-up rates, where mechanical pressure squeezes excess liquor back into the reservoir to maintain uniform dry add-on percentages.
Rheological Profile
Shear thinning behavior during high-speed application ensures fluid penetration into dense yarn bundles under roller nip pressure. Viscosity stabilization prevents gelation variations during continuous shifts, maintaining consistent pick-up across extended production runs. Gelatinization temperature ranges depend on botanical origin and chemical substitution degree, influencing energy consumption within cooking vessels.
Fluid elasticity prevents filament splitting during high-frequency reed impacts on air-jet looms.
Tensile Reinforcement
Dry film tenacity measured on single-end testers confirms the mechanical integrity imparted to the yarn matrix before weaving commences. Elongation at break decreases as film add-on increases, requiring balanced formulation to retain sufficient elasticity for shed formation. Subsequent desizing efficiency depends on enzymatic hydrolysis rates during wet finishing, ensuring complete removal without damaging the underlying cellulose structure.
Final fabric grade evaluation records residual sizing compounds via iodine staining tests to verify compliance with export quality standards.
