Standard Core Sampling Methods for Raw Cotton Bale Testing
Standard core sampling extracts representative full-depth fibers across compressed bales to verify moisture, micronaire, and net scoured commercial mass.
Net Scoured Weight
Clean Fibre Yield
The weight of a wool or cotton lot after all natural grease, dirt, suint, and industrial impurities have been removed represents the actual amount of processable fiber. The net scoured weight provides the basis for final commercial invoicing, ensuring that the buyer does not pay for non-fibrous contaminants that are washed away during processing. This value is determined after the raw material undergoes thorough scouring in the mill, establishing the exact dry clean weight of the shipment.
Scouring Process
Raw fibres are washed in hot, alkaline solutions to dissolve natural waxes, sweat residues, and dirt particles. Measuring the net scoured weight requires weighing the dried, clean fibre under standardized moisture conditions. This procedure allows the mill to calculate the yield percentage of the raw lot.
Commercial Calculation
Contracts for raw wool and cotton specify the price per unit of clean fiber to protect buyers from variable dirt levels. The net scoured weight is used by accountants to adjust the initial gross weight payment to match the clean yield. This adjustment prevents overpayment on high-shrinkage raw materials.
Mill Efficiency
Production scheduling in the spinning mill depends on knowing the volume of clean fibre available for yarn manufacturing. Having an accurate net scoured weight prevents shortages in the blending area and ensures that the spun yarn matches the order volume. This operational precision avoids delays in fabric shipments.