Document Type : Original Article
Authors
1
Proteinic and Man-made Fibres Department, National Research Centre, El-33 Behouth St., 12622-Dokki, Giza, Egypt.
2
Dyeing, Printing, and Textile Auxiliaries, Department, National Research Centre, El-33 Behouth St., 12622-Dokki, Giza, Egypt.
Abstract
This work is devoted to try to reduce consumption of water during scouring and dyeing of wool, viscose, and polyester fabrics. This was achieved by scouring wool, viscose, and polyester fabrics by the carbonate salt of sodium, potassium, or ammonium using different material-to-liquor ratios. The scoured fabric was removed from the scouring bath, and the residual liquor was divided into three aliquots. The first aliquot was used directly for dyeing of scoured wool fabric with Acid Blue 193, scoured viscose fabric with Reactive Blue 19, and scoured polyester fabric with Disperse Red 56. The pH of the second aliquot was adjusted to pH 4.5 using dilute hydrochloric acid and then used for dyeing of the scoured fabric with the respective dyes. The third aliquot was adjusted to neutrality by using calcium chloride solution which resulted in precipitation of calcium carbonate; the supernatant of which was taken out of the bath and directly used for the dyeing process. The colour strength of the dyed fabrics was measured and compared to the corresponding conventionally scoured and dyed fabrics. The fastness properties of the dyed fabrics against light, washing, rubbing and perspiration were also assessed. Results of this study revealed that it is possible to use the residual scouring bath of wool, viscose, and polyester fabrics after being rendered acidic or neutral, for their dyeing successfully. Physico-mechanical properties of all scoured fabrics were measured.
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