Effect of Dyeing Parameters on Bursting Strength of Knitted Fabric
Md. Zahid Hasan, Farhana Jannat
Email: md.zahid.edu@gmail.com
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Abstract
To produce fabric according to the requirements of the buyer is important. As bursting strength is a dominating factor for determining the property of the knitted fabric, it is a fundamental requirement of the buyer. In this research an attempt was made to measure the effect of dyeing parameters on bursting strength of knitted fabric produced from polyester and rayon blended fiber yarn. By changing temperature, dispersing agent, pH value, amount of salt and soda, different types of salt and soda; the dyeing process was carried out. After getting the final dyed knitted fabric the bursting strength was measured by following ISO 2758-2003 test method. Temperature changes showed a significant impact on the bursting strength of knitted fabric. The variation of pH value, amount of dispersing agent, amount of salt and soda as well as different types of salt and soda, all had an effect on the bursting strength of the knitted fabric to a smaller extent. The experimental data showed that the highest strength value was 116.1 kPa for dyeing of polyester part at 120°C and for rayon part dyeing, it was 108.1 kPa when the temperature was 70°C. Fluctuation of pH value vary bursting strength merely and the highest value 109.3 kPa was obtained at pH value 7, addition of 0.9 g/l dispersing agent showed the highest value of 108.1 kPa and for salt and soda amount of 40 g/l and 45 g/l resulting the highest value of 108.3 kPa and 108.1 kPa respectively. In case of using different types of alkali and salt, Potassium Hydroxide (KOH) and Calcium Sulphate (CaSO4), generated the highest value which were 110.5 kPa 110.1 kPa respectively. Consequently, the above parameters should be used for dyeing of polyester-rayon knitted fabric.