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The effect of single bath treatment on reactive dyeing and bio-polishing of viscose fabric
Kokol, Vanja ; Golob, Vera, 1954-2005
Different cellulose enzymes with an optimum activity at a neutral pH and temperature between 500.60 'C that coincides with conditions of standard reactive dyeing were added at the beginning of the ...viscose dyeing in order to achieve savings in time and cost of enzyme pretreatment in the case of two-phase processes. Investigation confirmed the increased smoothness, improved dyeability and better handIe with no particular changes of mechanical properties of viscose subject to endo-enriched cellulolytic enzyme in the case of pre- or after- treated samples. This was not in the case of samples subject to combined bath (enzymatically dyeing) owing to the occurrence of reactive dye - enzyme interactions. Contrary, the complex cellulase enzyme did not seem to interfere with the shade of the combinatory treated fabric, whereas in the case of enzymatic after treatment the colour strength of dyed fabrics was reduced as the surface fuzz was removed. Independent of the type of enzyme used, the dyeability effect depends primarilyon the timely period of salt addition and secondlyon the reactive dye - enzyme interactions; better dyeability is obtained when the dye is added later to the bath solution.
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