45—TORSIONAL AND RECOVERY PROPERTIES OF WORSTED YARNS

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Abstract
An investigation is described in which the torsional and recovery properties of single worsted yarns are studied by means of a torsion-balance apparatus designed to obtain the torsional-hysteresis curve of the yarn under conditions of constant tension. The net torque in the yarn is calculated by subtracting the torque developed by the applied tension; at high twists, the effects of fibre-buckling near the centre of the yarn are introduced, which leads to a non-uniform stress distribution throughout the yarn. For worsted yarns, the effects (on yarn torque) of fibre quality and yarn linear density are experimentally investigated and compared with the two extreme analytical cases of complete freedom and no freedom of relative fibre movement during yarn-twisting. The torsional rigidity of the yarn is evaluated from the slope of the torque-twist curves.

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