Caustic Strength
Molar titration values govern the alkaline steeping liquor where raw flax line fibres undergo structural breakdown before wet spinning commences. Sodium hydroxide concentration determines the swelling rate of cellulose polymers inside the primary plant cell wall during alkaline extraction. Higher hydroxyl ion availability breaks internal hydrogen bonds between microfibrils to dissolve residual hemicellulose and pectin fractions.
Excessive alkalinity causes osmotic damage to elementary fibres and degrades tensile strength parameters beyond acceptable limits. Mills record these titration results on the daily chemical kitchen control sheet alongside temperature logs and batch density readings.
Liquor Preparation
Operators dissolve solid caustic flakes inside agitated mixing tanks to reach the targeted normality before pumping the liquid into impregnation troughs. Sodium hydroxide concentration drifts downward during continuous steeping runs because dissolving plant gums consume active alkali. Technicians add fresh liquor or concentrated stock feeds to maintain titration stability within the specified operational window.
Water temperature alters dissociation constants and volumetric mass transfer rates during this chemical dissolution stage. Quality auditors cross-reference chemical consumption totals against the mass of dry fibre processed to detect undetected leaks or dosing inaccuracies.
Acceptance Criteria
Export buyers establish strict chemical thresholds in the technical specification agreement to prevent structural degradation of linen yarns during processing. Sodium hydroxide concentration tolerance limits restrict variations to plus or minus two grams per litre from the agreed baseline value. Laboratory technicians titrate neutralized washwater samples against standard acid solutions to verify that final rinsing stages remove residual alkali completely.
Failure to maintain these chemical parameters results in yarn weakness and uneven dye uptake across woven apparel fabrics. Final inspection certificates record alkaline treatment values alongside breaking tenacity measurements to guarantee compliance with commercial grade standards.
