Abstract
Air jet weaving is the most productive method for the production of fabrics. However, the energy consumption of air jet weaving machines is signifi cantly higher than the consumption of other weaving machines. Almost 80% of the energy consumed can be attributed to the losses at the relay nozzles. At the Institut fur Textiltechnik of RWTH Aachen University, Aachen, Germany diff erent novel relay nozzle geometries with lower air consumption have been developed on the basis of simulations and trials. The simulations have shown potential energy savings up to 50% compared to conventional relay nozzles. Furthermore, practical validations of the results of these simulations have been done. The velocity, stagnation pressure and volume fl ow were measured in the reed channel. In addition, an energetic and economic evaluation of the best relay nozzle geometry was done. The evaluations have shown that up to 50% of the energy can be saved.
Highlights
1.1 Air Jet WeavingThe textile industry is an energy intensive industry
At the Institut für Textiltechnik of RWTH Aachen University, Aachen, Germany different novel relay nozzle geometries with lower air consumption have been developed on the basis of simulations and trials
The current state-of-the-art air jet weaving machines employ a tandem and main nozzle combination for the purpose to provide the initial acceleration to the weft yarn, and a series of relay nozzles along the reed channel to keep constant yarn velocity of about 55– 80 m/s
Summary
1.1 Air Jet WeavingThe textile industry is an energy intensive industry. The increasing energy costs represent a challenge for textile manufacturers as well as for the developers of textile production machines. The air jet weaving is the most productive and the most energy consuming weaving method [1]. In the air jet weaving process the weft yarn is inserted into the shed with compressed air by using different types of nozzles. The current state-of-the-art air jet weaving machines employ a tandem and main nozzle combination for the purpose to provide the initial acceleration to the weft yarn, and a series of relay nozzles along the reed channel to keep constant yarn velocity of about 55– 80 m/s. At the end of the insertion process a nozzle catches and stretches the yarn at the right side of the machine. A cutter is used to cut the yarn when the insertion is completed, and the beat-up movement completes the fabric production process [3]
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