Design of the Nozzle for Producing Vortex Core-Spun Yarns

The vortex spinning technology inserts twist into the yarn at a high speed by means of the swirling airflow generated inside the nozzle. The layered structure of its resultant yarn makes this spinning technology suitable for producing core-spun yarns. Therefore, the nozzle is the key part of the vortex spinning machine. In this paper, the current research progress of the design of the nozzle for producing vortex core-spun yarns is reviewed. The complex characteristics of the swirling airflow inside the nozzle are discussed. It is pointed out that numerical simulation based on computational fluid dynamics (CFD) is an effective method for optimizing the flow characteristics inside the nozzle and thus can provide the basis for designing the nozzle. Novel designs of the nozzle for producing vortex core-spun yarns are still expected, especially the nozzle with a low amount of lost fibers.

Keywords: Vortex spinning; Nozzle; Core-spun yarn; Airflow; Simulation