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Title: Modification of some physical properties of wool by finishing processes involving reduction
Author: Shah, Pravin J.
Awarding Body: University of Glasgow
Current Institution: University of Glasgow
Date of Award: 1965
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The effects on dyed woollen material of permanent pleating processes such as the sodium bisulphite (Immacula), the ammonium thioglyeollate (siroset) and the urea-bisulphite have 'been investigated. By exposing the material to various conditions of humidity mid temperature, the effect of storage conditions e.g. during a sea voyage, has been assessed and some dyes have been found to be sensitive to the presence of reducing agents. In light-fastness tests an even wider range of dyes has been found to be sensitive. A comparative study of some mechanical properties of the woollen materials treated with reducing agents and steamed for various intervals of times ranging from 20 to 120 second, has been made and a relationship has been found between the percentage swelling and the tensile strength of the treated material. A considerable lose in the tensile strength has been found in the ease of yarn given the urea- bisulphite treatment. The crease-retention of the material stored under various humidity conditions has been studied and found to vary very little. Optical and electron microscope investigations have been made on the wool which has been given the above treatments and the investigations have been further extended to the fibres treated with urea-reducer solutions under various conditions of concentration pH, time and temperature. Different, staining methods have been employed to differentiate between the ortho- and the para-cortex of the fibres. The results are discussed in relation to the histological location in the fibre of the action of these reagents. There is an evidence that in merino wool fibres having a bilateral cortical structure p under the condition of neutral pH, the urea-reducer solution attacks the cuticle around tire ortho-cortex, first dissolving the outer layer of the exocuticle and, within the fibre, dissolves material mainly from the ortho-cortex.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available