The effect of nozzle design on the air velocity for an air-jet filling insertion system has been investigated. The relationship between the supply air pressure and the air velocity at the nozzle axis is explained using a simplified model for the nozzle. The presence of the yarn tube has a substantial influence on nozzle performance. The interaction between the jet and the air guide system (in the form of a tube) is discussed in terms of the ratio of the guide diameter to the nozzle diameter.
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