Optimizing Warp Sizing Polymer Add-on Levels for Air-Jet Weaving Efficiency
Optimizing sizing polymer add-on levels balances yarn hairiness reduction against shed dusting to maximize air-jet loom efficiency and lower desizing costs.
Hydroxyethyl Starch
Etherified Polymer
Non-ionic starch derivatives synthesized through the reaction of native grain starches with ethylene oxide introduce hydroxyethyl ether groups that disrupt hydrogen bonding between adjacent polymer chains. Commercial applications of hydroxyethyl starch focus on warp sizing formulas requiring stable cold-water solubility and low solution viscosity. Chemical modification prevents structural gelation during prolonged storage in slasher supply tanks.
Sizing technicians select this polymer for high-speed weaving of combed cotton and fine polyester blends.
Film Ductility
Flexible polymer films formed upon drying provide superior surface encapsulation without causing yarn embrittlement. Blending hydroxyethyl starch into sizing recipes yields tough protective coatings that withstand severe abrasive friction inside loom harness frames. Smooth film surfaces minimize fiber shedding during high-speed insertion.
Effluent Load
Desizing effluent management benefits from modified starch chemistries that exhibit lower biological oxygen demand compared to unmodified native starches. Processing plants using hydroxyethyl starch reduce wastewater treatment loads while maintaining rapid enzymatic desizing rates in preparation ranges. Lower chemical oxygen demand improves plant compliance.
Retrogradation Stability
Solution viscosity remains constant over broad temperature ranges because hydroxyethyl substitution prevents amylose recrystallization. Unstable starches form thick gels that clog slasher feed lines and cause uneven size pickup across the warp beam. Constant viscosity guarantees uniform film thickness.