Abstract
An appratus, mainly constructed by the electro-inductance gauge, is devised for measuring the torque-twist properties of yarns.
Several results on rayon tire cord yarn obtained with this equipment are shown as follows;-
1) Increasing in pre-tension, the twist moment of oiling and nonoiling rayon tire cord yarns rises as increasing the twist is increased, and the logarithm of the torque is found to vary nearly linearly with twist under the various pre-tension. Thus, the equation governing the torque (M)-twist (T) relationship is:
log M=a+b T
where a and b are constant.
Also torque of the non-oiling rayon tire cord yarn is always greater than of the oiling yarn.
2) Effects of the rate of twisting in these experiments on the torsional rigidity of the non-oiling yarn are not clear.
3) On measuring the repeated torque-twist curve of non-oiling yarn at the varied maximum twist turns, the quantity of the delayed torque due to time-effect appears as twist increases.
4) The torque versus log time relationship is found more nearly linear in measuring torsional relaxation of the non-oiling rayon tire cord yarn. As the twist in increased the rate of relaxation becomes greater.
