Long Staple Flax Fibre Tensile Metrics and Scutcher Loss
Long staple flax tenacity and scutcher loss dictate yarn spinning limits and processing economics, requiring standardized ISO gauge length testing and mill-level mass balance verification.
Teille Yield
Fibre Output
Processing raw flax straw into marketable textile material depends upon a specific volumetric ratio known as teille yield, which measures the dry cleaned line fibre recovered from an original harvested mass entering the mechanical scutching stage. Scutching machines beat the broken stalks to separate woody core from bast strands, leaving a mass that determines both immediate spinning efficiency and subsequent yarn pricing. Mills calculate this proportion by weighing dried lint against incoming bundles before delivery to the heckling department.
Low moisture content skews the calculation upwards, so operators standardise ambient humidity inside the scutching hall before recording weights on the mill dispatch log. Acceptance criteria issued by European spinning houses penalize lots falling beneath a strict baseline fraction, whereas internal mill targets push for higher recovery through tighter blade adjustments on the scutching turbine.
Spinning Loss
Retained impurities inside the scutched sliver directly reduce downstream yarn regularity during wet spinning operations on frame machines. Short tow fractions extracted alongside long line fibre bypass the primary draw frames and move toward coarser carded yarn production lines instead. Operators monitor waste percentages continuously across each shift to detect excessive fibre breakage caused by blunt scutching blades or over-retted straw.
Higher waste alters operational economics because short fibres command lower market prices than combed line material destined for fine cambric weaving.
Export Grade
Finished yarn packages receive official classification stamps according to tensile strength and hairiness counts recorded during laboratory testing before shipment to foreign buyers. Buyers evaluate these physical properties against international merchant rules rather than individual mill productivity metrics. Commercial contracts bind exporting mills to deliver specific uniformity indices, and failure to meet those thresholds results in financial deductions applied to the final invoice.
Teille yield therefore influences final export valuation indirectly by determining the proportion of high grade yarn available for weaving dense summer fabrics.