Gravimetric Loss

Thermal Tolerance

Industrial dryers apply forced convection across wet wool fleeces, driving ambient humidity downward while escalating core fibre temperatures. Controlled heat exposure prevents polymer degradation inside the protein structure, but runaway thermal gradients trigger uncontrolled mass reduction through protein pyrolysis. Operators adjust air velocity nozzles to maintain standard moisture regain figures without scorching the scoured staple.

Raw fleece lots possessing high vegetable matter content suffer accelerated weight reduction because burr carbonisation acid treatments destroy cellulosic impurities alongside wool scales.

Yield Variance

Commercial contracts between scouring mills and topmakers stipulate acceptable mass tolerances for every processed lot. Incoming greasy lots exhibit natural variability in suint and dirt proportions, creating discrepancies between estimated grease yields and actual scoured output. Settlement invoices rely on core testing laboratories to determine clean wool content prior to financial transfer, insulating buyers against excessive fibre degradation during chemical cleaning.

Mills operating outdated centrifuge bowls frequently register higher waste extraction rates, forcing downward adjustments on commercial valuation certificates.

Fibre Stability

Chemical degradation during oxidative bleaching accelerates structural decay, leaving wool filaments vulnerable to mechanical stress inside downstream carding engines. Damaged cortical cells shed microscopic debris when subjected to high speed metal teeth, producing excessive short fibre waste known as noils. Spinners evaluate batch quality by measuring residual greasy mass alongside staple strength parameters to predict worsted yarn performance.

Lower tolerance thresholds separate acceptable raw material processing from severe fibre damage caused by aggressive chemical treatments.