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Abstract

The first part of this paper deals with the interaction of first and second nozzle pressures in air-jet spinning of microdenier polyester/cotton blended yams. The results show that the first and second nozzle pressures interact with each other to determine yarn strength. This is because both the number of wrapper fibers and the length of wrappings formed at a particular first nozzle pressure depend on the level of the second nozzle pressure and vice versa. There is an optimum number of wrapper fibers and wrapping lengths that yields the maximum yarn strength, and this optimum level can be obtained at several different nozzle pressure combinations because first and second nozzle pressures interact with each other. However, it would be advantageous to use the lowest of these nozzle pressure combinations because of significant savings in energy costs. The second part of this paper investigates the effect of yarn delivery speed, first nozzle pressure, and blend ratio on the hairiness profile of microdenier polyester/cotton blended air-jet spun yams. The results show that yarn hairiness increases with increased yarn delivery speed and first nozzle pressure, but decreases with increasing amounts of polyester in the yarn. Also, the three factors (yarn delivery speed, first nozzle pressure, and blend ratio) interact with one another in determining yarn hairiness.

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Interaction of Process and Material Parameters in Air-Jet Spinning

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