Influence of yarn structure, sizing ingredients and type of sizing on properties and performance of sized yarns : Part III<b> </b>- A study of attrition during weaving for air-jet, ring and rotor yarns on a modern high speed weaving machine

Abstract

How best the yarns of a given spinning system can be sized with optimum cost to overcome attritive forces acting on warp yarns during weaving has been studied. Polyester/viscose (70:30) yarns (30s) obtained from the three spinning

systems, viz. air-jet, ring and rotor, were sized with cold brand PVA and tested for abrasion and tensile properties. Using these yarns in warp, a plain weave fabric was woven on a Dornier Rapier loom. The yarns were then unravelled from the fabric and tested for the abrasion and tensile properties. It is observed that among the ring, rotor and air-jet yarns, the excellent abrasion resistance is obtained with air-jet yarn at higher size concentration and slow rate of drying. This is because at higher concentration there is good size film formation on the yarn surface and at slow rate of drying more outward size migration takes place, resulting in better size encapsulation. An air-jet yarn whose strength properties are derived from the tightness and compression of the surface wrappings is, therefore, protected from the abrasion forces, caused during weaving, by this size film for a longer duration.