Proteomic Identification Principles for Fine Animal Fiber Verification
LC-MS/MS tryptic peptide analysis provides species-specific verification of fine animal fibers, overriding optical scale degradation in processed blends.
Chlorination
Oxidative Treatment
Aqueous chlorination operates as a chemical modification method applied to wool tops within mill wet processing departments to reduce felting shrinkage and improve dye uptake. Hydrolysis of sodium hypochlorite produces hypochlorous acid in chilled dye baths, attacking protruding surface scales on animal fibres. Chlorine molecules oxidize disulfide bonds in cystine residues within the cuticle layer, softening the outer barrier and allowing dye liquor to penetrate more rapidly.
Reaction kinetics depend strictly on bath pH values held near four, preventing fiber degradation caused by excessive oxidation. Operators transfer treated slivers to antichlor washing stages immediately when uptake reaches target exhaustion limits.
Scale Modification
Hydrophobic epicuticular proteins degrade under controlled chlorine exposure, changing surface energy characteristics across the entire yarn length. Differential friction effects between root-ward and tip-ward directions drop significantly after chemical treatment concludes. Untreated wool exhibits high directional friction coefficients, causing scales to interlock permanently during laundering agitation.
Oxidative removal of serrated scale edges eliminates this interlocking mechanism completely, stopping progressive shrinkage in consumer garments.
Processing Control
Chemical concentration levels require precise titration checks before sliver immersion begins in continuous pad-batch machinery. Low agent volumes yield incomplete scale leveling, leaving residual felting tendencies inside finished knitwear items. Excessive chemical dosage strips the cortex entirely, causing severe tensile strength losses and brittle handling in spun yarns.
Technicians monitor oxidation reduction potential probes continuously to adjust reagent feed rates throughout long production runs.
Finish Verification
Laboratory testing departments measure treated fabric samples for dimensional stability after repeated machine washing cycles. Area shrinkage percentages must remain below strict commercial tolerances before finishing certificates release batches for garment assembly. Staining tests confirm uniform dye affinity across cross-sections of wool top slivers following chemical modification.
Final inspection reports record both residual chlorine levels and bursting strength figures to guarantee compliance with retail performance standards.