Fiber Classification
Raw botanical flax stalks enter the spinning mills under Harmonized System Heading 5301, which groups unworked or retted bast materials before mechanical separation begins. Chinese processing plants inspect these incoming bundles for residual pectin content and moisture levels, checking each bale against strict buyer specifications rather than internal factory preferences. Buyers reject material containing excessive woody core fragments or fungal degradation, because substandard stalks compromise subsequent hackling machines.
Sliver Evaluation
Intermediate drawing frames process the separated filaments into continuous ropes, where technicians monitor linear density and staple uniformity across every shift. Mill standards govern drafting ratios and twist multipliers, ensuring the resulting roving meets the physical demands of high-speed ring frames without breakage. Laboratory testing measures breaking tenacity and elongation under tension, separating low-grade tow from long-line line fiber intended for fine yarn production.
Yarn Verification
Final export inspection examines finished linen yarn packages for count regularity and hairiness before baling the product for international markets. Commercial documents record these measured parameters alongside the origin code, confirming compliance with the trade agreements established prior to shipment. Strict tolerances separate commercial weaving yarn from knitting qualities, ensuring that end-use performance matches the contractual obligations agreed between spinner and weaver.
