Standard Linen Yarn Tensile Specifications for Weaving Preparation
Wet-spun linen warps demand a minimum tenacity of 18.5 cN/tex with under 1.2% beaming stretch to maintain loom stop rates below 1.5 per 100,000 picks.
CMC Size
Starch Retention
Polymeric sizing agents applied to flax yarn during warp preparation establish protective surface films that withstand mechanical abrasion on high-speed weaving looms. The cmc size designation quantifies carboxymethyl cellulose concentrations within aqueous sizing baths prior to enzymatic desizing stages. Soluble cellulose ethers alter sizing viscosity, determining film elongation properties and hairiness reduction on wet spun yarns.
Spinning mills control substitution degrees to maintain adequate tensile strength across heavy canvas production runs.
Film Elasticity
Aqueous dispersion stability depends on temperature gradients maintained inside size box compartments during continuous yarn immersion. Extrusion pressures dictate dry pick up levels, balancing warp stiffness against subsequent shedding flexibility on shaft looms. Export documentation records these dry mass percentages to verify compliance with buyer acceptance thresholds established for fine linen piece goods.
Molecular weight distributions influence residual film solubility, preventing uneven dye absorption during final piece dyeing operations.
Viscosity Control
Rheological measurements track shear thinning behavior within circulating sizing liquor to prevent nozzle clogging during pad application cycles. Temperature fluctuations alter gelatinization rates, requiring immediate cooling adjustments to preserve consistent coating thickness across continuous flax warps. Desizing baths subsequently hydrolyze the applied cellulose film, preparing woven fabrics for finishing treatments without fiber degradation.
Residual ether detection protocols verify complete removal before merchandise proceeds to export packaging.