Calculating Commercial Mass Regain Adjustments for Dehaired Specialty Animal Fibres
Commercial mass regain adjustments recalculate dehaired specialty fibre billing weight by converting net scale mass to clean dry keratin plus official allowances.
Residual Fatty Matter
Chemical Purity
Fibre processing efficiency depends on the small percentage of natural or added waxes, oils, and fats remaining on a textile substrate after scouring. Measuring the residual fatty matter determines whether a wool or cotton shipment has been adequately washed before dyeing or spinning. This value represents a key quality checkpoint in raw material preparation.
The evaluation prevents problems in subsequent finishing and dyeing operations.
Extraction Analysis
Laboratories use Soxhlet extraction with organic solvents to dissolve and isolate the fatty substances from the textile sample. After the solvent evaporates, the technician weighs the remaining oily residue to calculate the percentage relative to the dry fabric mass. A high level of residual fatty matter can cause spotty dyeing because the oils block the aqueous dye solution from penetrating the fibres evenly.
Spinners also require controlled fat levels to maintain proper yarn friction during drafting.
Process Impact
Dye houses rely on clean fabrics to achieve level shades and good colorfastness. Monitoring the residual fatty matter ensures that the prepared fabric has a uniform absorption rate across its entire width. Finishers can run scours at optimal temperatures without wasting detergent.
Spinners and fabric mills achieve higher productivity when yarn runs smoothly through the machinery.
Testing Boundary
Heavy oil finishes or synthetic sizing agents added during yarn preparation can interfere with the standard extraction results. Technicians must apply specific pre-treatments to distinguish between natural waxes and added processing lubricants. The method does not apply to fabrics made from synthetic monofilaments.