Raw Material Assessment
Mechanical divergence of individual flax stalks occurs when retting agents dissolve pectins holding technical filaments together inside the stem matrix. Jiangsu processing facilities measure bundle separation during preliminary combing operations to determine whether microbial degradation reached the required depth before mechanical breaking begins. Technicians pull representative samples from steep tanks, dry the bast under controlled humidity and record the force required to draft individual fibres from the surrounding gum.
Commercial grade sheets differentiate between under-retted bast requiring additional chemical exposure and over-retted material yielding weakened strands prone to excessive breakage during subsequent drawing frames.
Drafting Resistance
Slippage dynamics dictate that poorly separated filaments bind prematurely inside the gill box, causing uneven slippage and irregular card sliver thickness. Jiangsu spinning mills track draft resistance curves to prevent high tension zones from snapping delicate plant cells before twist insertion on wet ring frames. Excessive pectin residue forces operators to increase roller weighting, which raises power consumption and generates short tow percentages that degrade yarn regularity.
Production logs record drafting force in centinewtons per tex, establishing baseline tolerances for export quality warp yarns destined for high speed weaving looms.
Export Verification
Finished yarn lots undergo physical verification against international linen standards before release to overseas buyers. Export documentation certifies that residual gum content and filament distribution fall within mutually agreed contractual limits established prior to bulk shipment. Laboratory reports detail mean breaking length and coefficient of variation for tenacity across random bobbins drawn from the final packing station.
Final commercial settlement depends entirely on these laboratory certificates issued by accredited provincial testing bureaus in eastern China.
