Loom Speed and Tension to Reduce Warp and Weft Breaks in Air Jet Weaving

Loom Speed and Tension to Reduce Warp and Weft Breaks in Air Jet Weaving is a published article of the Textile Technology department.,The study sought to identify correct values of loom speed and warp tension suitable for weaving 100% cotton yarn on Dornier double beam Air Jet Looms, AWSE2/E type. The causes of warp breaks are, poor quality yarn, uncontrolled temperature and humidity, uncontrolled weaving tension and loom speed. The experiments were conducted to determine warp and weft breaks at i) varying warp tension (50cN to 85cN) and constant speed (560 rpm,), ii) at constant warp tension(80cN) and different loom speed (520 to 560 rpm). The company where the study was conducted is referred to as ?Company A?. Temperature and relative humidity and were kept constant at 27? and 75% respectively. The yarn quality was good (11cN/tex), according to the Ulster Statistics standard levels which was the exact tenacity of the 30 tex yarn used at ?Company A?. The results showed that warp and weft breaks occur even if the maximum warp tension during weaving is lower than the breaking strength of the yarn. A combination of high loom speed (560 rpm ) and high tension (80cN) lead to increased breaks, but breaks become reduced with the reduction in tension to 70cNeven if the machine speed was maintained at 560 rpm . Above that tension, warp breaks start to increase. The number of warp breaks was also found to increase with the loom speed. Weft breaks also occurred due to entanglement at low warp tension (50cN). Adjustment of warp tension and loom speed can help to determine the optimum values of warp tension and loom speed to be used in order to reduce the number of warp breaks for individual Air Jet Looms. An equation to determine the number of warp breaks which can occur at a given warp tension was modelled. This equation[eq 4] can be used to provide very good estimations for initial setting of warp tension. Another modelled equation[eq5] can be used to estimate the number of weft breaks at a given warp tensi