Raw Cashmere Classing and Guard Hair Percentage Estimation
Raw cashmere value hinges on clean down yield and optical verification of residual coarse hair content below zero point five percent by mass.
Residual Coarse Hair Limit
Specification Threshold
Contractual ceilings define the maximum allowable mass fraction or numerical count of stiff outer guard hairs permitted in commercially dehaired animal fiber lots. In luxury spinning mills purchasing cashmere down, the residual coarse hair limit establishes whether raw dehaired fiber meets processing standards for premium knitwear or requires secondary mechanical processing. Guard hairs possess thick diameters and continuous central medullas that contrast sharply with delicate, non-medullated down undercoat.
Industrial purchase agreements set this ceiling between zero point two and zero point five percent by weight, depending on target yarn count and garment construction.
Carding Efficiency
Mechanical dehairing equipment extracts rigid outer fibers by passing bulk fleece over multiple carding cylinders and centrifugal blowers. Achieving a tight residual coarse hair limit demands aggressive cylinder speeds and repetitive combing passes that risk snapping fragile down fibers into unspinnable short fragments. Mills balance coarse hair extraction against down fiber length retention, because over-processing converts valuable long staple fiber into short carding waste.
High-speed optical fiber diameter analyzers monitor carding output continuously to detect dulling wire clothing or misaligned separator plates. Prompt machine adjustments maintain fiber purity without driving processing losses beyond economic feasibility.
Tactile Performance
Coarse fibers that slip past dehairing equipment directly undermine the softness and next-to-skin comfort of finished luxury apparel. Thick guard hairs exceeding thirty micrometers in diameter possess substantial flexural rigidity, resisting deflection when pressed against human epidermal tissue. Residual coarse hairs act as rigid miniature columns that trigger sensory nerve pricking, causing perceived skin irritation and wearer scratching.
Even minor deviations above the specified threshold turn premium sweaters into uncomfortable garments that fail brand quality audits.
Acceptance Protocol
Testing laboratories confirm compliance with contract limits through computerized projection microscope analysis or automated optical measurement systems. Technicians measure thousands of individual fiber diameters across representative lot samples to calculate the exact percentage of coarse hairs exceeding defined diameter boundaries. Lots breaching the residual coarse hair limit incur contractual price penalties or face outright return to the scouring facility.