Secondary Cell Wall Microfibril Orientation in Climate Affected Line Flax
Elevated microfibril angles in climate-stressed line flax reduce fiber tenacity, lower hackling yield, and limit wet-spinning performance to coarse counts.
Raw Material Qualification
Fibre Verification
Inbound lot inspection establishes the physical, chemical, and morphological compliance of uncarded flax scutching tow or hackled line flax before processing begins. Through a systematic protocol, raw material qualification assesses long flax bundle length, tensile tenacity, retting degree, moisture content, and non-bast impurity percentages. The process categorizes raw shipments into spinning counts and determines blending ratios for wet-spinning frames.
The qualification applies to unspun fibres at delivery, ending once hackling, carding, or chemical pre-treatment alters the original bale state.
Mill Intake
Incoming raw flax shipments from France, Belgium, or domestic Chinese farms undergo immediate raw material qualification upon arrival at the mill receiving bay. Quality control personnel draw representative samples across randomly selected bales according to statistical sampling plans. Laboratory staff test the scutched flax for residual shive content using mechanical cleaners and measure bundle strength on pressley or stelometer clamps.
Retting consistency is evaluated through sensory checks and water absorption rates, which indicate pectin breakdown. The findings are compiled into an intake inspection report that assigns each bale lot an internal spinning grade.
Spinning Suitability
Mill technical directors use the completed raw material qualification to allocate fibre lots to specific wet-spinning yarn counts. High-tenacity, well-retted line flax lots with low shive percentages qualify for fine count spinning, such as sixty lea and above. Lower-grade hackled tow lots containing higher pectin concentrations are routed to dry-spinning or coarse blended yarns.
If an incoming shipment fails to meet the contractual grade defined on the commercial invoice, the qualification docket serves as the legal basis for commercial claims or price adjustments. This initial grading ensures spinning efficiency and minimizes end-breakage rates throughout the spinning room.