Numerical and experimental study of the influence of nozzle flow parameters on yarn production by jet-ring spinning

Abstract

Yarn hairiness is defined as the protruding fibers and loops standing out of the core of the yarns. Effect of yarn hairiness on different post processes, and its influence on the characteristics of the product obtained, has led to attempts at reducing hairiness. In recent years, new technologies such as compact spinning, solo spinning and jet-ring spinning have been developed to reduce the hairiness of ring spun yarn. In this paper, a Computational Fluid Dynamics (CFD) model is presented to study the effects of some air jet nozzle structural parameters as injector angle, nozzle length, and air pressure level on the swirling flow generated inside the nozzle. Followed by design and construction of a mechanism for producing jet ring and modified jet ring yarns. Finally, an experimental study on the effects of some nozzles and air flow parameters on jet ring and modified jet ring yarn properties is presented intending to illustrate the role of inserting the air jet nozzle for improving these systems. Keywords: Jet-ring spinning, Yarn hairiness, CFD, Simulation, Air jet nozzle