Audit Procedures for Fibre Reconciliation across Jiangsu Linen Weaving Mills
Audit Jiangsu linen mills by reconciling dry-conditioned raw fibre intake against desized fabric output and verified scrap ledgers.
Desizing Extraction Test
Residual Assessment
Chemical quantification validates the removal efficiency of starch-based sizing agents from linen fabrics after wet processing steps in the textile finishing line. A desizing extraction test provides the primary verification that size compounds were successfully stripped from the fibres without damaging the substrate structure. Analysts perform this procedure by sampling a specific mass of treated linen, which then undergoes a solvent-based wash or an enzymatic digestion to isolate the remaining sizing residue.
Gravimetric analysis determines the final weight difference between the initial sample and the dry residue, confirming whether the batch meets the internal cleanliness standards for subsequent dyeing or printing operations. Proper execution prevents chemical interference during the later application of dyes, as leftover starch creates barriers that block pigment penetration into the flax fibres. Consistent calibration of the extraction equipment ensures that the results remain accurate across various production shifts.
Process Verification
Laboratory technicians verify the outcomes of desizing extraction test protocols to maintain adherence to quality control documentation stored within the mill management system. Weaving mills typically require a percentage-based threshold for residual size to authorize the transition of fabric rolls toward the bleaching stage. If the weight of the recovered starch exceeds the predefined limit, the material returns to the desizing bath for another cycle to avoid batch rejection by the buyer.
Fabric grade remains separate from fibre grade because the former relates to the physical integrity of the construction after chemical exposure while the latter concerns the raw supply quality. Verification occurs immediately upon the completion of the desizing cycle to prevent the cooling of fabrics, as temperature variations alter the solubility of starch polymers.
Operational Boundary
Performance limitations dictate the scope of the desizing extraction test when applied to blended linens containing synthetic fibres that exhibit solubility in common laboratory solvents. These measurements yield reliable data solely for pure flax substrates because the reagents utilized do not differentiate between organic starch and non-cellulosic synthetic polymers. The method acts as a definitive safeguard against faulty desizing, ensuring only cleaned fabric enters the final supply chain.