An account is given of an investigation of the mechanical state of single wool fibres in some worsted yarns, spun on a high-draft spinning system, by the radioactive-tracer-fibre technique. By means of this technique, it is shown that, whereas the main fibre-strain-inducing parameter is the insertion of twist into the yarn, a significant, if small, amount of this strain occurs as a result of the drafting process.
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Hickie et al. (1974) studied this question.