Calculating Dehairing Yield Mass Balance across High Guard Hair Batches
Calculate dehairing yield by converting raw mass to clean dry keratin weight, subtracting guard hair and dirt losses, and normalizing to 17% commercial regain.
Residual Guard Hair Threshold
Luxury Standard
Permissible maximum content of coarse, prickle-inducing fibers in cashmere or alpaca batches protects the soft hand feel and premium price of the finished knitwear. This limit is the residual guard hair threshold, which is typically set by high-end brands at a fraction of a percent of the total fiber weight.
Tactile Sensation
Human skin detects fibers with diameters greater than thirty microns as coarse and irritating, which produces a distinct prickle sensation when worn next to the skin. By enforcing a low residual guard hair threshold, yarn manufacturers ensure that their luxury blends remain exceptionally soft and non-irritating. De-hairing machines must run at optimal settings to remove these stiff guard hairs from the fine down fibers.
If the de-hairing process is incomplete, the presence of these coarse fibers in the yarn ruins the garment hand and devalues the finished product.
Lab Verification
Testing laboratories determine the percentage of coarse fibers in a cashmere sample by measuring several thousand fibers using optical projection microscopes. The residual guard hair threshold is verified by checking that the proportion of fibers above the critical diameter limits remains below the contractually agreed maximum.
Material Grading
Cashmere lots that exceed the specified threshold are downgraded and diverted to less demanding products like woven outerwear or blankets. This sorting process ensures that only the finest raw material is used for next-to-skin garments.