Fiber Allowance
Raw flax processing requires specific adjustments when moisture content departs from standard atmospheric conditions during trading. Yarn linear density deduction removes excess weight caused by absorbed water before commercial settlement occurs between the spinning mill and the raw material supplier. International trade protocols dictate that dry mass calculations rely on oven-dried weight plus a legally recognized moisture regain percentage specific to bast fibers.
Technicians determine this figure by drawing core samples from flax bales immediately upon arrival at the Chinese spinning facility. Export documentation records both gross weight at the port of origin and net dry weight following the subtraction procedure, establishing the definitive baseline for manufacturing costs.
Calculation Protocol
Laboratory technicians execute this mathematical adjustment by applying standardized moisture regain constants to the initial mass of the flax batch. Wet spinning preparation depends on exact linear density measurements because excess humidity distorts mass per unit length values during drafting. The testing procedure involves weighing a representative specimen, drying the material in a forced air oven at a controlled temperature until weight stabilization occurs, and recording the absolute dry mass.
Multiplying that dry mass by the official commercial regain factor yields the correct mass for invoicing purposes. Factory floor supervisors verify these calculations against incoming delivery dockets before releasing raw flax into the hackling and carding departments.
Settlement Boundary
Contractual disputes regarding yarn linear density deduction usually arise when buyer acceptance criteria diverge from mill quality standards during final fabric export inspections. Finished linen fabric grading evaluates structural integrity, weave density, and tensile strength rather than raw material moisture limits. Mill standards enforce strict tolerances on yarn mass variations to prevent uneven dye absorption during wet finishing processes.
Commercial agreements stipulate that financial penalties apply if post-spinning linear density deviations exceed negotiated limits stated in the purchase contract. Final settlement invoices reflect these mass adjustments, protecting both the spinning mill and the overseas apparel buyer from paying for excess water weight disguised as usable fiber.
