Yarn Fineness
Mass per unit length expresses the fineness of flax slivers during preparatory drawing operations on the factory floor, calculated as decitex to establish how many grams weigh ten thousand metres of continuous strand. Chinese spinning mills evaluate this metric on the production ledger to monitor drafting regularity before roving passes to the wet spinning frames. Production controllers verify mass variation against the technical data sheet issued by the purchasing department when raw flax arrives from foreign suppliers.
Specification Limit
Contractual limits separate acceptable spinning stock from rejected lots when laboratory technicians test samples pulled from the preparatory line. Tolerances defined in the buyer acceptance criteria restrict mass deviation within tight percentage bands to prevent uneven drafting during high speed processing. Mill standards enforce stricter controls internally than external buyers demand because machinery faults multiply rapidly once twisted yarn reaches the weaving shed.
Finishing Threshold
Final fabric grade depends entirely upon consistent yarn dimensions achieved during earlier mechanical drawing stages recorded in the mill quality log. Irregular mass distribution creates visible streaks across bleached linen cloth after wet finishing treatments alter the surface tension of the fibers. Export inspectors check finished bolts against the original spinning specification to confirm that linear density dtex remained stable throughout the manufacturing cycle.