Sampling Protocol
Gravimetric assessment of bulk raw wool or cotton bales requires extracting internal core specimens from deep within compressed packaging. Core moisture sampling provides a representative specimen of internal liquid distribution without destroying commercial packaging or opening whole bales. Specialized pneumatic tubes fitted with sharp cutting tips penetrate bale covers, withdrawing cylindrical fiber cores along a standardized diagonal path.
This physical sampling method prevents surface drying or ambient humidity absorption from biasing total consignment mass determinations.
Thermal Drying
Extracted fiber cores undergo immediate weighing before transferring into heated convection ovens operating at specified standard testing temperatures. Drying continues until successive weighing cycles confirm that all uncombined moisture has evaporated from the sample mass. Standard laboratory procedures isolate dry fiber weight by eliminating atmospheric humidity variables present during initial extraction.
Mass Calculation
Discrepancy between gross weight recorded at mill receipt and calculated dry mass determines official commercial weight. Fiber contracts specify allowable moisture regain percentages added to dry mass to calculate invoice totals. Accurate core extraction prevents financial disputes over water mass billed as raw textile material.
Commercial Acceptance
Testing certificates issued by accredited wool and cotton testing authorities govern global consignment values. Processing mills use these certified moisture figures to adjust dye recipe concentration and spinning calculations.
