Enzymatic Breakdown
Biological preparation removes the natural pectin binders holding flax stalks together before spinning occurs in Chinese mills. Degumming softens raw bast material by dissolving non cellulosic gums that restrict individual fibre separation. Microbial baths or alkaline solutions target cementing compounds without damaging cellulose molecular chains.
Operators monitor bath temperature closely because excess heat degrades tensile strength prematurely. Mill testing divides processed strands into distinct export grades based upon residual lignin content and length distribution. Laboratory certificates record these physical metrics for every commercial lot leaving the facility.
Fabric grading standards apply strictly to finished yarn density rather than raw stalk composition. Mill acceptance thresholds often exceed buyer minimums to prevent downstream breakage during high speed mechanical looms operation.
Solution Viscosity
Chemical consistency testing measures the molecular weight degradation resulting from over processing during preparation stages. Fluid flow measurements track cellulose chain length reduction through standard capillary viscometers. High viscosity values indicate adequate preservation of natural polymer integrity within individual filaments.
Weakened fibres show accelerated breakdown rates under alkaline exposure conditions. Production managers review viscosity reports daily to adjust chemical dosing levels before yarn spinning commences. Each batch certificate lists specific flow times alongside standard moisture regain percentages.
Export documentation requires both metrics to satisfy destination country customs verification protocols. Contractual disputes usually arise when mill internal viscosity targets conflict with overseas customer spinning tolerances.
Washing Residue
Final rinsing cycles eliminate remaining alkali traces and degraded pectin fragments from processed bast ribbons. Pure water sprays operate continuously across vertical wash towers to prevent chemical redeposition onto clean surfaces. Residual alkalinity causes yellowing during subsequent bleaching and dyeing treatments.
Quality control personnel titrate rinse water samples hourly to verify neutral pH conditions. Residual ion concentrations must remain below strict mill limits prior to mechanical drying. Drying chambers reduce moisture content uniformly across the entire batch thickness.
Dry strands undergo carding preparation immediately after cooling down to ambient temperatures. Final baling operations seal certified lots inside protective wrappers for international transport.
