Dehaired down Yield Estimation from Raw Cashmere Core Samples
Tube core sampling and laboratory card dehairing determine clean down yield, adjusting raw lot costs against moisture regain and industrial carding losses.
ASTM D1060
Standard Practice
Core sampling methods defined by consensus bodies establish systematic procedures for extracting representative specimens from packaged raw wool and related animal fibres. Published under the designation ASTM D1060, this standardized practice provides instructions for withdrawing interior cores from compressed bales or packages to determine clean wool fibre present and moisture content. The framework outlines mechanical coring tube specifications, sample layout patterns, and statistical requirements for lot representation.
Its scope strictly applies to raw wool packages in commercial transactions, terminating once the drawn core sample enters wet chemical analysis or bench testing.
Mechanical Execution
Pneumatic or electric rotary cutters drive hollow steel tubes through package outer covers deep into the compressed core of the bale. The ASTM D1060 procedure dictates that the cutting edge maintain absolute sharpness to cleanly shear through fibre bundles without pushing them aside. Operators insert the coring tube parallel to the package axis or through designated face locations to prevent bias toward edge-concentrated impurities.
Extracted cylindrical cores pass automatically into airtight plastic liners, preventing moisture exchange with ambient warehouse air. Technicians immediately weigh the sealed sample container to capture true gross weight at the moment of sampling.
Statistical Control
Package selection relies on random stratified sampling tables governed by total consignment size and bale variance. A single core per package may suffice for uniform clean fleece, whereas heterogeneous dirty lots demand multiple penetrations across a larger percentage of bales. ASTM D1060 calculates minimum composite sample mass to ensure that clean yield estimates fall within strict confidence limits.
By enforcing random package selection, the standard prevents warehouse handlers from presenting only exterior, premium-grade bales to the inspection team.
Commercial Application
Scouring mills and international wool brokers establish gross payment terms directly on test results obtained from these core samples. Raw lots cannot settle on unverified bill-of-lading masses because dirt, grease, and moisture account for more than half the gross weight of greasy fleece. Testing laboratories scrupulously cite compliance with ASTM D1060 on every yield certificate.
A documented deviation from the coring routine allows counterparties to reject the resultant clean yield analysis and demand independent re-coring of the consignment.