Wet Spun Linen Warp Tensile Strength and Single End Breakage
Wet spun linen warp breaking strength depends on low strength CV and elastic sizing film to resist cyclic shed tension and prevent single end loom stops.
PVA Sizing Starch
Chemical Composition
Polymeric protective chemical compounds applied during warp yarn preparation increase yarn bundle cohesion and surface smoothness for high-speed loom processing. Formulations containing pva sizing starch combine film-forming polyvinyl alcohol with modified starches to coat spun flax yarns prior to loom mounting. Natural flax fibers possess irregular surface hairiness that requires strong surface adhesion to bind loose fibrils into the yarn core.
Mill sizing logs record bath temperatures and pickup ratios for every warp beam lot.
Protective Mechanism
Polyvinyl alcohol provides tough, flexible film protection with high abrasion resistance, while modified starch lowers cost and improves sizing liquor viscosity. The blend penetrates fiber bundles to anchor internal filaments without making the yarn excessively brittle or difficult to split at the lease rods. High humidity in weaving sheds softens the size coating slightly, maintaining yarn pliability under dynamic shed tension.
Spinning and weaving mills monitor size refractometer readings continuously to ensure consistent liquor concentration across long production runs.
Desizing Boundary
Finished fabric export standards require complete desizing before chemical bleaching or dyeing operations take place. Residual synthetic polymers impede dye penetration, producing cloudy shading or streakiness across dyed linen rolls. Chemical testing laboratories confirm size removal levels using starch iodine tests and wash-off extraction protocols.