Yarn Count and Sizing Chemistry in Warp Preparation
Warp sizing requires matching yarn packing factor to polymer viscosity, adjusting squeeze nip pressure for precise solids add-on, and maintaining elongation.
Desizing Effluent
Processing Discharge
Wastewater stream generated during the removal of sizing agents from woven cloth. Management of desizing effluent remains a primary concern for mills during the wet finishing stage of linen production. Starch or synthetic polymers used to strengthen flax yarns for the loom dissolve into the liquid.
Volume and composition of the flow vary depending on whether enzyme, acid, oxidative or mechanical methods are employed to clear the warp.
Chemical Load
Concentration of organic matter in the fluid is measured by biological and chemical oxygen demand. Because desizing effluent carries the bulk of the sizing material applied during weaving preparation, it typically contains the highest concentration of pollutants in the mill. Biodegradable starch agents increase the biological load heavily.
Synthetic alternatives like polyvinyl alcohol resist natural breakdown and require advanced oxidation processes. High temperatures in the discharge often exceed 60 degrees Celsius. Heat levels like these alter the efficiency of downstream biological treatment plants.
Successful management requires monitoring the total dissolved solids and the pH balance to ensure compliance with local environmental discharge permits.
Mitigation Requirement
Treatment protocols involve primary clarification followed by secondary biological digestion. Desizing effluent is neutralized and cooled before entering a standard activated sludge system. Factory water recycling loops saturate quickly without proper sequestration of this stream.