Yield Valuation
Raw wool valuation relies on determining the exact mass of pure oven-dry fiber present in grease wool. The clean scoured yield represents the percentage of usable fiber remaining after removing wool wax, suint, dirt and vegetable matter from a raw lot. This metric establishes the actual trading price of grease wool contracts by converting raw fleece mass into commercial clean fibre weight.
Scouring Process
Industrial scouring washes raw fleeces through hot aqueous liquor bowls containing biodegradable surfactants and soda ash. Dirt settles in heavy bowls while centrifugal separators recover industrial lanolin. The clean scoured yield calculation accounts for residual extractable matter, ash content and vegetable base left in the scoured fiber web.
Commercial Calculation
Commercial trading standards require core sampling of greasy wool bales according to rigorous statistical patterns. Core samples undergo laboratory washing, solvent extraction and drying to establish certified yield percentages. If greasy wool weighs one thousand kilograms and yields six hundred kilograms of clean fiber at standard moisture regain, the clean scoured yield equals sixty percent.
Buyers compute invoice settlements on this certified percentage to avoid paying for grease and sand.
Trade Standard
Certificate issuance by official testing authorities validates net clean mass for international export shipments. Variations in clean scoured yield alter mill spinning estimates and determine processing machinery adjustments.
