Cellulose Yield
Pectin extraction efficiency measures the percentage of non-cellulosic gummy substances removed from raw flax stems during alkaline boiling in Chinese wet spinning mills. Chemical cooks strip natural cementing agents from bast fibres so individual technical elements separate cleanly without mechanical damage to the cellulose skeleton. This metric determines how much unwanted pectin dissolves into processing liquor relative to the total mass originally present in the harvested straw.
Mills monitor the parameter during preparation phases because residual gums prevent proper fiber alignment and interfere with subsequent drafting rollers on roving frames. Low removal rates leave sticky residues on combing pins and cause yarn breakage during high speed spinning operations.
Chemical Ratio
Caustic soda concentration and bath temperature dictate the speed of saponification reactions inside pressure vessels. Technicians adjust liquor alkalinity based on titration results from daily laboratory samples drawn from the wash water circuit. Higher sodium hydroxide dosages accelerate removal but degrade the underlying polymer chains if operators fail to neutralize the bath at the exact moment target values are reached.
Thermal energy applied through steam coils keeps reaction rates stable across varying batch sizes processed throughout the shift. Surfactants added to the bath lower surface tension and allow the chemical solution to penetrate dense woody cores of stubborn stems.
Quality Benchmark
Commercial contracts between flax growers and mill buyers establish strict thresholds for residual gum content before yarn enters the export market. Mill laboratories test dried slivers against internal reference standards to verify that preparation steps met commercial grade requirements for fine textile production. Fabric buyers demand low residual gum levels to ensure even dye uptake and consistent tensile strength across finished woven goods.
Excessive plant residuals remain trapped inside twisted yarns and cause uneven dyeing spots that fail final inspection checks.
