http://nopr.niscpr.res.in/handle/123456789/16361 2026-10-09T03:31:29Z http://nopr.niscpr.res.in/handle/123456789/23497 Title: Green technology in textile processing: Part IV—Eco-friendly dyeing of polyester/cotton fabric Authors: Deo, H T; Wasif, A I; Desai, B K; Chakraborty, Arindam Abstract: New eco-friendly dyeing processes are described for dyeing of polyester/cotton blend fabrics with disperse/reactive and disperse/vat dyes. By process modifications (Eco-Dyeing I and Eco-Dyeing II) and by substituting the non-ecofriendly chemicals with the eco-friendly ones, a significant reduction in pollution load in terms of Biochemical Oxygen Demand (BOD) and Chemical Oxygen Demand(COD) has been achieved. The reductions achieved in BOD and COD respectively are 10.47% and 14.38% for dyeing with disperse/reactive dyes and 7.56% and 12.82% for dyeing with disperse/vat dyes. A substantial saving in water consumption has also been achieved in both the methods of dyeing. Eco-Dyeing II , in particular, results in 85% saving in water consumption. Page(s): 64-69 1999-03-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/23495 Title: Interdependence of fibre type and the design of the nozzle of air-jet spinning machine Authors: Basu, A; Oxenham, W Abstract: The effect of second nozzle design on the properties of yarns made of cotton, polyester and regenerated cellulosic fibres has been studied. The axial orifice angle of the second nozzle has been varied and its influence on the yarn properties studied. The optimum axial orifice angle is found to be different for different fibres. Page(s): 10-15 1999-03-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/23493 Title: Effect of caustic pretreatment at varying tension level on dyeing behaviour of jute, flax and ramie Authors: Chattopadhyay, D P; Samanta, A K; Nanda, Renuka; Thakur, Sumeet Abstract: The effect of caustic soda pretreatments at slack and at different levels of tension on the dyeing behaviour of jute, flax and ramie yarns has been studied using direct, reactive (cold and highly exhaustive brands) and basic dyes. It is observed that the higher the hemicellulose content of the lignocellulosic fibre, the higher is the weight loss on caustic soda treatment. Weight loss increases for all the fibres with increase in caustic soda concentration or decrease in tension level during treatment. Decrease in basic dye uptake and increase in direct and reactive dye uptake are observed with the increase in caustic soda concentration during pretreatment for all the fibres. With increase in tension level during treatment, the dye uptake decreases to some extent, irrespective of the fibre type or caustic soda concentration. Page(s): 74-77 1999-03-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/23492 Title: Towards right-first-time dyeing of polyester using disperse dyes: Influence of some assignable variables Authors: Nanda, B; Shukla, R R Abstract: The effects of dyebath <i>p</i>H<i>, </i>heat-setting temperature and material-to-liquor ratio on the dyeability of polyester fabrics have been studied for a range of disperse dyes to compare their degrees of susceptibility towards variation in these parameters. This was done by dyeing the polyester samples varying the above process parameters and finally calculating and comparing the strength ratios of the dyed samples. It is observed that the dyes studied respond differently to the process variables used. Page(s): 70-73 1999-03-01T00:00:00Z