From the present research work it is concluded that properties of ring spun yarn are better than air-jet spun yarn. Under different blend ratios, yarn and fabric tensile properties improved gradually as the share of polyester in the blend was increased. However under two different yarn spinning systems (ring and air-jet), fabric strength, of ring spun yarn knitted fabrics is greater as compared to air-jet spun yarn. The results indicated that yarn and fabric strength as well as fabric weight showed highly significant effects of machine and blending ratio.
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Shahbaz et al. (2005) studied this question.
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