The effect of physical ageing on torque in worsted spun yarns

Phillips, D. G.; Hair, Jan; Marsh, Julia; Staynes, Laurie

doi:10.1007/s12221-009-0266-7

Cited by 1 publication

(1 citation statement)

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“…The model can be evaluated to assess the possible cause of these differences. (Phillips et al 2009) and if the self-plying twist is regarded as the balance point then clearly the ply twist for zero torque or balance decreases 10% per decade of storage time, i.e., from 50% to 40% in one decade. This may be a contributing factor to the values of about 60% measured for the unsteamed yarn in Fig.…”

Section: Resultsmentioning

confidence: 99%

Torsional properties of staple fibre plied yarns

Phillips¹,

Tran²,

Fraser³

et al. 2010

Journal of the Textile Institute

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A mathematical analysis of the mechanical governing equations applying to the torsional behaviour of multi-ply yarns under tension has been carried out. This analysis clearly shows that there are two components, a geometric component that determines the slope or gradient of the torque due to tension and a component that determines the yarn torque at zero applied tension (intrinsic torque) that depends on the fibre number, fibre moduli and diameter as well as the strand structural geometry. The effect of the ratio of the ply twist to the spinning twist of the single strands on the torque properties has been numerically analysed for two, three and four-ply yarns prepared from single 31 tex yarns. The model has been compared with experimental torque data for a range of two-ply yarns plied at different percentages of the singles spinning twist and also with different yarn histories and test environments. The experimental data reflect the trends identified by the model.

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Section: Resultsmentioning

confidence: 99%