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Abstract

Pigmented wool yarn contains an excessive amount of melanin responsible for its black or brown color. Depigmented wool yarns were prepared by pre-mordanting then acidic rinsing and finally bleaching. Some of the physical and chemical properties of the treated yarns such as color, strength and alkali solubility were tested. The results showed that the oxidative/reductive bleaching process produced wool yarns with better optical properties than the oxidative bleaching process, but increasing concentrations of thiourea further decreased the yarn tensile strength. Scanning electron microscopy confirmed fiber surface damage was greatest following the oxidative/reductive bleaching process. The results also indicated that minimal fiber damage could be obtained using commercial ferrous sulfate in acidic media (citric acid) with improved iron absorbency.

Keywords

depigmentation melanin oxidative reductive bleaching physical and mechanical properties wool

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Depigmentation of Pigmented Wool

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