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Effect of Dyeing and Related Processes on some Physical Characteristics of Wool
Author(s) -
Elliott J.,
Oldfield N.,
Stevens C. B.,
Whewell C. S.
Publication year - 1961
Publication title -
journal of the society of dyers and colourists
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.297
H-Index - 49
eISSN - 1478-4408
pISSN - 0037-9859
DOI - 10.1111/j.1478-4408.1961.tb02422.x
Subject(s) - dyeing , wool , solvent , ultimate tensile strength , sodium carbonate , chemistry , alkali metal , materials science , breaking strength , chemical engineering , pulp and paper industry , composite material , sodium , organic chemistry , engineering
Values are given for the percentage reduction in the work to stretch wool fibres (% RW) after various treatments similar to those likely to be encountered in preparation and dyeing. Special attention is given to the changes brought about by solvent‐assisted dyeing processes. In mild acid and alkaline treatments, low values are obtained if the temperature does not exceed 70d̀C, but above this temperature the % RW increases rapidly. Although under the conditions recommended for solvent‐assisted dyeing the % RW is small, the presence of solvent increases the % RW if fibres are treated for long times at high temperatures. This suggests that under these conditions irreversible changes are brought about by the solvent. Measurements of breaking load and extension of yarns treated under various conditions show that greater degradation is produced when yarns are treated first in an acid solution and then in alkali than when the treatments are in the reverse order. This phenomenon was not observed in successive dyeing and sodium carbonate treatments. In these cases the total reduction in yarn tensile strength was considerably less than the sum of the reductions brought about by individual treatments, except where dyeing was carried out at pH 2.