In a dye bath containing different amounts of sodium chloride
(0e20 g/l) and 8% lac dye with liquor ratio 40:1, cationised
cotton fabric was dyed using conventional heating (CH) at
different pH values (1.5e10) for different duration 12e
120 min and at different temperatures (30e80 C). For comparison,
the same condition of dyeing was carried out using
ultrasonic dyeing (US) with sonic power of 500 W. The
optimum value of sonic power was obtained after studying
the effect of sonic power on the dyeability of cationised
cotton. Thus, in a dye bath containing 8% lac dye with liquor
ratio 40:1 and pH 2.5, cationised fabric was dyed at 80 C for
60 min using different sonic power levels (100e500 W). The
effect of the number (1e5) of dye bath reuse was also conducted
in a comparative manner for both US and CH methods.
The dyed samples were rinsed with cold water, washed in
a bath of liquor ratio 40:1 using 3 g/l non-ionic detergent
(Hostapal CV, Clariant) at 95 C for 30 min, then rinsed and
finally dried at ambient temperature.
The pH values were recorded with Hanna pH meter and
adjusted with dilute solutions of sodium carbonate, as the
dye extract was acidic (pH 1)
In a dye bath containing different amounts of sodium chloride
(0e20 g/l) and 8% lac dye with liquor ratio 40:1, cationised
cotton fabric was dyed using conventional heating (CH) at
different pH values (1.5e10) for different duration 12e
120 min and at different temperatures (30e80 C). For comparison,
the same condition of dyeing was carried out using
ultrasonic dyeing (US) with sonic power of 500 W. The
optimum value of sonic power was obtained after studying
the effect of sonic power on the dyeability of cationised
cotton. Thus, in a dye bath containing 8% lac dye with liquor
ratio 40:1 and pH 2.5, cationised fabric was dyed at 80 C for
60 min using different sonic power levels (100e500 W). The
effect of the number (1e5) of dye bath reuse was also conducted
in a comparative manner for both US and CH methods.
The dyed samples were rinsed with cold water, washed in
a bath of liquor ratio 40:1 using 3 g/l non-ionic detergent
(Hostapal CV, Clariant) at 95 C for 30 min, then rinsed and
finally dried at ambient temperature.
The pH values were recorded with Hanna pH meter and
adjusted with dilute solutions of sodium carbonate, as the
dye extract was acidic (pH 1)
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