The Distribution of End Breaks Over the Chase of a Cop-Build Ringframe: The Effects of Winding-On Angle and Ringrail Movement

Abstract

The distribution of end breaks over the chase of a cop-build ringframe has been investigated with reference to the effects of the winding-on diameter and the direction and speed of the movement of the ringrail. Some of the interesting findings are as follows. Contrary to general belief, the nose and its vicinity is not always the region of the chase which is most vulnerable for end breaks to occur. In fact, there are cases in which the end breaks are markedly high in the lowest and middle part of the chase. These observations can be explained on the basis of the counter-balancing effect of the twist and tension cycles over a chase. The ratio of the rate of end breaks in the upward to that in the downward movement is invariably higher for the fast-up slow-down ringrail movement than for the reverse type of movement. The collected data also show that this ratio is generally less than unity for very low levels of yarn tension and increases to a value much higher than unity for very high levels of yarn tension.