Length Verification
The specific mass determination metric known as yarn count lea establishes the linear density of spun flax fibre within provincial mills across northern China. Workers apply this standard unit during the intermediate drawing stage inside the spinning hall, quantifying mass per fixed length before the wet drawing frames compress the sliver. Documentation within the mill ledger records this exact measurement against pre-approved buyer tolerances.
Divergence beyond the permitted variance forces immediate adjustment of draft rollers on the spinning machinery.
Grade Differentiation
A distinct boundary separates the raw fibre class from the finished linen fabric classification inside the export warehouse. Quality supervisors evaluate raw flax strands by tensile strength and length before the spinning process begins, whereas woven goods undergo inspection for warp density and surface regularity. Mills maintain internal benchmarks to control production consistency, but the ultimate commercial acceptance depends entirely upon the buyer specifications detailed in the export contract.
Export Protocol
Commercial shipments receive clearance only after the quality control department matches the recorded yarn count lea data against the physical sample tested in the laboratory. Testing personnel condition the flax specimen in standard atmospheric chambers before weighing the measured skein on an analytical balance, ensuring ambient humidity does not distort the mass calculation. Maritime transport documents rely upon this verified metric to satisfy customs regulations at the port of destination.
