Polymer Cleavage
Chemical breakdown of synthetic warp sizes happens during desizing stages when water-soluble polymers undergo molecular weight reduction for washout from grey goods. Hydrolysis or oxidative treatment breaks the long carbon chains of polyvinyl alcohol into short fragments that dissolve readily in wash liquor. Scouring houses monitor this reaction closely to prevent residual sizing agents from blocking dye sites or causing uneven affinity during subsequent wet processing.
Depolymerized fragments pass through drainage systems into wastewater streams, requiring strict biological oxygen demand management before municipal discharge. Mill engineers adjust bath temperatures and enzyme dosages to control the rate of chain scission without damaging underlying cellulose or protein structures.
Waste Stream
Effluent management systems handle wash liquor containing cleaved polymer fragments following grey fabric desizing operations. Dissolved solids load increases when degraded sizing agents empty into equalization basins prior to biological treatment. Facility operators test chemical oxygen demand levels continuously to track the conversion efficiency of high molecular weight compounds into biodegradable constituents.
Aerobic bacteria consume the smaller molecular fragments within activated sludge basins, converting synthetic residues into carbon dioxide and biomass. Regulatory compliance requires effluent discharge samples to demonstrate substantial reduction in residual sizing polymers before release into local municipal water networks.
Enzymatic Action
Specific catalysts accelerate the breakdown of sizing films on woven textiles through targeted biochemical attack on polymer backbones. Amylase or specialized oxidative preparations disrupt ester and ether linkages within the applied sizing formulation, lowering viscosity rapidly within desizing ranges. Processing temperatures remain strictly regulated to maintain optimal catalytic activity without denaturing the active proteins prematurely.
Wash efficiency depends entirely on achieving complete molecular fragmentation, because partially cleaved chains retain film-forming properties that interfere with reactive dye fixation.
Filtration Control
Membrane separation units recover degraded sizing components from dilute rinse water streams generated during desizing operations. Ultrafiltration modules retain high molecular weight fractions while allowing low molecular weight salts and water to permeate the porous barriers. Concentrated polymer solutions recovered from the retentate loop return to sizing preparation kitchens for reuse on incoming warp yarns.
Operating pressures across the membrane modules require constant adjustment to counteract fouling caused by residual wax and cotton lint particles escaping the scouring baths.
