Standard Laboratory Methods for Quantitative Fibre Blend Analysis
Quantitative fibre blend analysis uses selective chemical dissolution, gravimetric desiccation, and microscopic counting to verify trade declarations.
Cuticular Scale Frequency
Surface Anatomy
Surface characteristics of animal fibres determine their spinning behavior and propensity to felt during wet processing. The cuticular scale frequency refers to the number of scale margins per unit length along the longitudinal axis of a keratin fibre. This structural feature differentiates wool from other animal hairs such as mohair or cashmere, as each species possesses a distinct scale pattern and spacing that influences how light is scattered from the surface.
Fibre Identification
Forensic analysis and quality audits in textile mills rely on these surface counts to detect adulteration in luxury fiber blends. A high cuticular scale frequency is typical of fine Merino wool, whereas cashmere displays fewer, more spaced-out scales. Testing laboratories use scanning electron microscopes or high-resolution optical systems to measure these patterns.
Processing Influence
Coarse fibres with fewer scales slide past each other more easily. Understanding the cuticular scale frequency helps spinners adjust the twist levels. Low scale density reduces inter-fibre friction during drafting.
Felt Propensity
Wet finishing processes cause wool fibres to migrate in the direction of their root ends, locking them together. This migration is driven by the directional friction effect determined by the cuticular scale frequency and height. Controlling this surface characteristic is necessary to prevent excessive shrinkage in washable wool garments.