Applying Union Customs Code Annex 22 Rules to Multi Country Blended Yarns
Non-preferential origin under Union Customs Code Annex 22-01 hinges on meeting primary processing rules or proving predominant constituent fiber weight.
Scutched Tow Weight
Fiber Yield
Scutched Tow Weight governs the mass quantification of short flax fibres separated during mechanical primary processing in regional Chinese spinning mills. Measured immediately after the mechanical extraction phase within the primary preparation shed, this metric establishes the exact proportion of broken filaments and short fibres separated from long line flax. Production supervisors record the resulting tonnage on the internal mill transfer sheet before the material moves to carding engines.
Grade Divergence
Short tow fractions require distinct quality boundaries separate from the criteria applied to long line flax or finished woven textiles. Processing lines evaluate tow quality through staple length distribution and residual woody particle content rather than the tensile strength standards demanded of yarn or cloth. Mill acceptance thresholds govern the internal transfer of batches between mechanical processing and carding departments, whereas external export contracts rely on separate commercial grading schedules agreed upon by international buyers.
Batch Calculation
Mill operators determine the specific ratio by dividing the total recovered short fibre mass by the initial dry straw weight entering the mechanical brake. Processing losses vary according to natural plant variation and machine settings during primary separation stages. Final commercial valuation depends directly upon this proportional calculation because the resulting percentage dictates subsequent spinning preparation schedules and final yarn pricing structures.