An account is given of an investigation of the dimensional properties of a series of interlock weft knitted fabrics produced from open-end cotton-polyester blended yarns with different yarn twist, loop length, fibre percentage in blend, and variety of relaxation treatments. A comprehensive experimental analysis shows that the Ks value (stitch density multiplied by the square of loop length) is related to yarn density, fibre percentage in blends, and relaxation treatments. It is also concluded that the correct relaxation state for cotton fabrics to reach the maximum shrinkage is full mechanical relaxation, and for cotton polyester blended and 100% polyester fabrics is chemical relaxation treatment. The empirical results show that the effect of mechanical relaxation decreases as the percentage of polyester in blends increases.
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Jeddi et al. (1999) studied this question.
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