Dew-Retted Heilongjiang Flax against Imported Water-Retted Bales
Dew-retted Heilongjiang flax provides cost savings for medium counts, while imported water-retted bales deliver the fineness needed for yarn counts above Nm 50.
Hackling Line Efficiency
Line Yield
Mechanical combing speed governs hackling line efficiency inside Chinese flax preparation mills, where long line output meets short tow waste on the sorting floor. Operators measure hackling line efficiency by comparing combed silver mass against total incoming strick weight on the production log. Combing machinery strips out root ends and tangles while parallelising remaining filaments for subsequent wet spinning frames.
Foreign buyers demand high hackling line efficiency during pre-shipment quality audits because clean line yields dictate final yarn evenness and count limits.
Fiber Sorting
Raw flax straw enters preliminary grading before hackling machinery separates line fiber from shorter tow components. Workers feed handfuls into rotating pins that strip away woody core fragments and broken nodes. Low machine output signals excessive fiber breakage during high speed pinning passes.
Mill supervisors record these yield drops inside daily shift registers to adjust pin density and feed roller pressure.
Mill Acceptance
Export grade linen demands strict adherence to maximum allowable tow percentages within combed sliver batches. Purchasers establish baseline thresholds for hackling line efficiency to prevent excessive short fiber inclusion during subsequent drafting operations. Contractual disputes often arise when incoming bale analysis reveals lower combed percentages than stated in the accompanying technical datasheet.
Laboratory technicians verify sliver regularity through automated capacitance testers before issuing final mill clearance certificates for overseas shipment.