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.
Non Fibrous Matter Allowance
Contamination Threshold
Acceptance of non fibrous matter allowance defines the maximum permissible weight ratio of extraneous organic or inorganic debris present within a raw flax batch. Foreign particles include shive, dust, seed fragments, or soil retained through mechanical scutching processes in Chinese primary processing mills. Each procurement contract specifies these mass limits to ensure that downstream spinning machinery maintains optimal throughput without internal blockage.
Buyers reference this technical constraint during the initial inspection stage to verify that the supplier has performed sufficient cleaning.
Material Calculation
Moisture content and inherent impurity percentages alter the base weight of flax bundles before the determination of the clean fibre yield. Inspectors derive the actual mass by subtracting the weight of identified impurities from the gross delivery volume. Consistent testing methodologies prevent inaccurate billing for debris that possesses no textile utility during the subsequent hackling or roving stages.
A calibrated scale provides the precise measurement required for this validation.
Quality Verification
Technical documentation such as the mill certificate or the independent inspection report formalizes the status of every lot against the negotiated non fibrous matter allowance. Discrepancies appearing between the physical inventory and the accompanying paperwork trigger a reconciliation process based on the agreed weight adjustment factor. Failure to maintain these debris levels indicates insufficient mechanical processing or improper storage conditions at the production facility.
Regulated debris limits protect the profitability of the manufacturer by preventing the purchase of heavy unusable residues.