Chemical Bath
Alkaline lixiviation parameters govern chemical scouring fractionation during the preliminary preparation stage in Chinese flax processing mills. Caustic soda concentrations operating between two and four grams per liter dissolve non cellulosic pectins from crude plant stems. Operational temperatures remaining near ninety degrees Celsius accelerate the saponification of surface waxes without degrading cellulose backbones.
Mill technicians record these bath concentrations in daily wet processing logs to establish baseline chemical oxygen demand values for wastewater treatment facilities. Raw fiber bundles undergo this alkaline treatment before mechanical carding operations separate long line flax from short tow fibers.
Cellulosic Purity
Final fiber grade specifications demand strict cellulose content thresholds measured through standardized gravimetric testing methods. Buyers establish minimum alpha cellulose percentages inside export contracts to separate premium textile grade fibers from lower industrial grades. Mill quality control laboratories verify these thresholds by weighing residual dry matter after acid hydrolysis procedures.
Acceptance criteria differentiate raw material input limits from finished yarn properties listed on accompanying mill test certificates.
Liquor Ratio
Bath volume calculations determine the mass of dry fiber processed relative to the weight of the alkaline solution inside the reaction vessel. Process engineers maintain liquor ratios between one to ten and one to twenty to ensure uniform chemical penetration throughout dense fiber bundles. Maintaining this ratio prevents localized concentration gradients that cause uneven pectin removal along individual flax strands.
Factory standard operating procedures bind operators to these specific volumetric limits during every production shift.
