Abstract
A general review is made of the methods of manufacture and physical properties of the following types of stretch yarn:—crimped nylon, crinkle, stretch and Ban-Lon. A general description and definitions of the physical properties of fabrics knitted from these yarns are also given. The effect of knitting stiffness (expressed in terms of yarn length per stitch) on the relaxed size, extensibility, recovery, area density and bulk of fabrics knitted from the above yarns is shown, and the interaction of yarn and fabric heat-setting treatments is discussed. The results given emphasise the necessity of accurate control of knitting stiffness and temperatures of yarn and fabric heat-setting treatments, if the quality of the finished fabric is to be maintained constant.
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