Standard Regain Calculation Procedures for Scutched Flax Fibre
Standard regain for scutched flax fibre is 12.00 percent, used to convert lab oven-dry mass into binding commercial invoice mass under ISO 6741.
Shive Content Tare
Fibre Purity
Unprocessed flax contains woody residuals from the stem which interfere with carding operations inside Chinese spinning mills. Shive content tare measures the non-lint foreign matter mass deducted during raw material acceptance testing before spinning commences. Technicians draw representative samples from bales arriving from northern agricultural provinces and determine the dry weight of extraneous woody fragments against total batch mass.
Mill acceptance protocols enforce strict upper limits on these calculated deductions because excess residual woody material clogs automated combs and weakens yarn tensile strength.
Batch Deduction
Commercial contracts between spinning mills and flax growers rely on standard weighing deductions to compensate for trapped woody matter within the raw shipment. Calculation procedures subtract the moisture-corrected mass of extracted impurities from gross delivery weight before final invoicing occurs. Buyers refuse payment for contaminated lots exceeding established impurity thresholds because excessive plant residue forces premature machinery downtime during hackling stages.
Export Standard
Finished linen yarn destined for international export markets undergoes rigorous laboratory inspection to verify compliance with global textile cleanliness classifications. Export certification bodies audit mill testing logs to confirm that shive content tare calculations follow accepted international testing standards. Discrepancies between supplier grading and buyer laboratory findings trigger formal arbitration procedures that govern international flax trading practices.