BEHAVIOUR OF YARN INTERACTED WITH HIGH-SPEED OBJECT UNDER SIDEWAYS-CONSTRAINT

Abstract

This paper presents an investigation of the dynamic behaviour of a yarn in an interaction with a high-speed object, for the lower warp sheet during the weaving process. The yarn movement on the object can be described in four stages from non-contact, contact, drop-off and withdrawal. A model is developed to predict this interaction, taking into account several factors such as yarn length, yarn tension, object speed, object orientation and object profile. A comparison of theoretical predictions and experimental measurements for different yarns indicates a good agreement. The theoretical model can be used to optimise the object profile in order to reduce the interactive yarn tension and to avoid any yarn damage.