A study of peeling-off tension in rotor spinning and its dependence on rotor and fibre variables part I: theoretical

Abstract

While assessing the overall yarn tension in rotor spinning, most of the researchers have ignored the contribution of peeling-off tension (T₀) assuming this being small. However, experiments in the present study showed a significant discrepancy between the calculated and the measured mean yarn tension due to neglect of T₀. Further, T₀ has a bearing in twist propagation and compacting the fibres in the zone of Peripheral Twist Extent (PTE) for ensuring continuity of the yarn formation. In the present study, a theoretical deduction has been made to estimate T₀ by summing up the contributions due to fibre tension at the yarn formation point and the tension arising out of the length of the PTE sliding in the rotor groove. The dependence of T₀ on various rotor and fibre variables has also been established.

Keywords:

• Fibre tension
• peel-off tension
• peripheral twist extent
• rotor spinning
• yarn twist