INFLUENCE OF “COLD” DYEING TECHNOLOGY ON FABRIC CHARACTERISTICS

"The current work presents a comparative analysis of the colour fastness against repeated washing of cellulose-containing fabrics dyed by “cold” and classical technologies, using different types of active dyes, at various concentrations in the dye bath. Mathematical models have been proposed to describe the determined dependencies. The study uses Reakol dyes – a trademark of bifunctional active dyes manufactured by Khimtex (Kherson), which can be used for “cold” resource-saving dying technologies. The studied active dyes are characterized by a wide colour spectrum, good solubility, colour purity and high resistance of colours to wet treatments. The study has found that increasing the concentration of Reakol dyes in the dye bath, from 10 to 30 g/L, as a rule, had no significant influence on the colour fastness of fabrics to repeated washing. However, the colour intensity on the fibre significantly rose when increasing the dye concentration in the dye bath. It was determined that, when using the “cold” dyeing technology, sweeping changes in the general colour contrast and residual concentration of the dye on the fibre occurred after the first 5 washes. The changes in these indicators somewhat stabilized after the following 10-20 washes. However, a proportional relationship between the variation in the general colour contrast and a decrease in the dye colour intensity on the fibre after the corresponding number of washes of the studied fabrics was not detected. "