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.
Acrylic Binder Polymers
Adhesion Mechanism
Synthetic film-forming resins added to warp sizing formulations increase the cohesion of starch films and enhance adhesion to hydrophobic synthetic fibres. Commercial formulations of acrylic binder polymers rely on acrylate and methacrylate monomers to tailor flexibility and water solubility. Carboxyl functional groups within these chains bond with hydroxyl sites on cellulosic surfaces.
Film Modulus
High glass transition temperatures yield rigid films that shatter under cyclic bending stresses on air-jet looms. Lower values allow acrylic binder polymers to deform elastically alongside polyester filament yarns without shedding dust into the reed.
Desizing Behavior
Water-soluble or alkali-soluble polymer formulations determine the ease of removal during wet processing downstream. When weavers apply acrylic binder polymers alongside native starches, hot alkaline wash baths neutralize carboxylic acid groups to solubilize the polymer matrix. Insufficient wash temperatures leave insoluble residues on grey fabric, causing uneven dye liquor absorption in subsequent dyeing operations.
Mill technicians verify removal efficiency through gravimetric extract testing after scouring.
Thermal Crosslinking
Heat applied during drying frames causes reactive side groups to form permanent network bonds across adjacent polymer chains. Copolymers containing N-methylolacrylamide react at temperatures above one hundred forty degrees Celsius. Excess heat during drying renders acrylic binder polymers insoluble and prevents wet desizing in subsequent finishing sequences.