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.
ISO 6741 Dry Mass
Moisture Baseline
The baseline measurement for conditioned flax fibre establishes a standardized moisture mass fraction by drying representative samples to a constant weight in a ventilated laboratory oven held at a specific thermal threshold. ISO 6741 dry mass provides the regulatory foundation for calculating commercial mass during the transfer of raw bast materials between primary processing mills and spinning facilities. Commercial invoices rely on this dry mass value multiplied by an agreed legal moisture regain percentage to determine final billable weight.
Thermal drying protocols apply strictly to scoured or hackled flax fibres prior to yarn formation and cease to govern once wet spinning operations begin.
Regain Allowance
Spinning mills adjust the absolute dry weight of incoming flax by adding a predetermined moisture allowance mandated by trading contracts. Commercial moisture regains compensate for natural atmospheric humidity absorption during maritime transit and warehouse storage. Technical protocols specify that conditioned mass equals absolute dry mass multiplied by one hundred plus the official regain percentage divided by one hundred.
Laboratory technicians verify this calculation on every production lot before release to drawing frames.
Processing Audit
Mill quality auditors cross-reference oven dried sample weights against wet spinning input logs to detect excessive moisture retention from retting and washing stages. Flax processors face financial deductions when delivered moisture levels exceed contractual limits specified in purchase agreements. Certified testing laboratories document these measurements on official weight certificates accompanying export bales.
Production managers use moisture deviation data to calibrate drying tunnels and steam conditioning chambers ahead of carding machinery.