Fibre Equilibrium
Mass absorption defines moisture regain as the ratio of water mass held within a textile material to the dry mass of that material, expressed as a percentage. Chinese flax spinning mills calculate this metric during ambient conditioning phases to establish true material mass before commercial transactions occur. Dried flax fibres naturally attract atmospheric water vapor until reaching a state of balance with surrounding temperature and relative humidity.
Commercial weight calculations rely on standard regain values published in national inspection codes because raw flax carries variable water quantities depending on seasonal weather fluctuations in storage warehouses.
Spinning Tolerance
Atmospheric humidity control inside the yarn production floor prevents excessive fibre breakage during high speed drafting and twisting operations. Spun linen yarns lose or gain mass rapidly when ambient moisture shifts between carding and spinning departments, requiring strict environmental monitoring to maintain quality grade specifications. Quality control inspectors record conditioned weights on the lot inspection report before releasing spun yarn packages to the weaving facility.
Standard testing procedures mandate oven drying samples at specified temperatures until mass stabilization occurs, after which dry weights combine with absorbed water weights to determine final commercial mass allowances.
Commercial Settlement
Buyer contracts stipulate exact legal regain limits for finished linen fabrics to ensure purchasers do not pay yarn prices for absorbed atmospheric water weight. Mill export documents reference these contractual percentages when calculating final shipment invoices for overseas garment manufacturers. Commercial disputes regarding invoice weights resolve through independent laboratory conditioning tests performed under controlled atmospheric standards.
Final payment adjustments depend directly on the variance between measured moisture levels and the agreed standard regain threshold specified in the purchase order.