Nylon 66 fabric was dyed with a disperse-reactive yellow dyestuff which was synthesised in our laboratory, using a supercritical carbon dioxide dyeing process. The structure of the disperse-reactive yellow dyestuff and its covalent bond with nylon 66 fibres were confirmed by FTIR, NMR, EA and MS analysis. The nylon fabric was also dyed with CI Disperse Yellow 3 and the dyeing results compared. Colour yield values were measured for both dyed fabrics, with those of the disperse-reactive dye showing much better values than CI Disperse Yellow 3. Wash fastness of the fabric dyed with the disperse-reactive yellow dye was tested by the ISO 2 method and showed excellent results. Light fastness was tested by the ISO 105 B05 method and the results were satisfactory. The results obtained indicate fabric immersed in supercritical carbon dioxide does not undergo any fibre damage.

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This research focuses on the effects of paste pre-treatment, concentration of sodium alginate, steaming conditions for colour yield and outline sharpness of ink-jet printing. The results show that (a) coating is a better method than padding for paste pre-treatment of cotton fabrics; (b) 102°C × 12min is the best condition for steaming; (c) pattern sharpness is better when the concentration of sodium alginate increases; and (d) color yield diminishes when the concentration exceeds 20g/L. In other words, when the optimum concentration of sodium alginate is 20g/L, the amount of ejected ink can reach as much as 260%. In this study, four reactive dyes (i.e. cyan, magenta, yellow and black) of different chemical constitutions were used, and the colour fastness results against washing and light reveal an acceptable rating above grade 4.