Fibre Classification
Scutched tow represents the shorter and more irregular vegetable fibres recovered from the mechanical dressing of flax straw during initial milling operations in Chinese textile facilities. This category governs the separation threshold between long line flax and short waste material, establishing a measurable boundary where processing transitions from aligned slivers to carded shorter staple fractions. Production mills evaluate these batches against distinct internal quality baselines before export packaging occurs.
Mechanical beaters separate the woody core fractions from the outer bast layer, leaving a tangled mass of broken filaments and residual shive. Handlers measure cleanliness by weighing remaining foreign matter against total sample mass. The designated grade appears directly on the bale tag attached at the end of the scutching line.
Spinning Performance
Carding machines draw scutched tow into uniform webs to prepare the short material for ring spinning frames in yarn production plants. Operators adjust roller pressure settings because the irregular staple length creates friction during drafting passes. Short vegetable fragments require rigorous cleaning passes to prevent yarn breakage during subsequent wet spinning procedures.
Buyers specify maximum allowable impurity percentages within purchase contracts to govern acceptable yarn irregularities. Laboratory technicians test sample skeins for tensile strength and twist uniformity after the roving stage reaches completion.
Commercial Inspection
Export documents record scutched tow according to moisture regain limits and trash content verified by independent inspection agencies at the mill gate. Mill standards differ from overseas buyer specifications because domestic processors tolerate higher shive counts for coarser industrial yarns. Inspectors pull core samples from stacked bales to verify that internal moisture levels remain below the maximum threshold stipulated in international trade agreements.
Fabric grade assessments differ fundamentally from raw fibre evaluations because weaving mills test yarn regularity rather than raw staple length. Final commercial valuation depends entirely on cleanliness ratings and residual lignin content recorded on the shipping certificate.
