24—AN EXPERIMENTAL STUDY OF THE GEOMETRICAL STRUCTURE OF SINGLE YARNS

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Abstract
Results of measurements of retraction as a function of twist are given for yarns produced by continuous twisting processes, as opposed to the twisting of a fixed length. These are compared with Tattersall's2 earlier work and also with the predictions of Treloar's1 theory. When continuous twisting methods are used, the agreement with theory is very good. The tracer filament technique of Morton and Yen3 is used to examine the path of a filament in the yarn. Measurements of filament angle by this method yield results in close agreement with theory. Visual evidence of filament migration is also provided. This technique also enables possible variations of twist and packing density across the section of the yarn to be examined. Preliminary results indicate that the twist increases towards the centre of the yarn.

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