Abstract
In the previous paper the experimental study of yarn twisting and snarling was reported and the application of theoretical criteria for predicting the critical parameters of snarling was discussed. This paper deals with modelling of snarling in textile yarns. The twisted textile yarn is modelled as an elastic rod subject to torque and tension. A unified model of snarling/kinking is developed which takes account of geometrical non-linearity. The sequential stages of loop/snarl formation and elimination are studied. The critical parameters of loop/snarl formation and elimination are obtained and the theoretical model compared with experimental results. The changes in yarn torsion, torque and tension which accompany loop formation and elimination are discussed.The modelling results provide an insight into the snarling mechanism and can be used both to enhance efficiency of twisted yarn production by elimination of snarling and to simulate the fancy loop/snarl yarn appearance. The present model may serve as a basis to develop more sophisticated models.
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