Abstract:

In order to investigate the dynamics and wrapping quality of the fibers in the formation process of the vortex core-spun yarn containing metal wire, a device for the online monitoring based on an industrial endoscope was designed and images of the metal wire and the staple fibers moving in the spinning nozzle was captured. The characteristics of the exposed metal wire core during the wrapping process of the fibers were extracted. Comparative analysis of the amounts of exposed metal wire core in the wrapping process and in the yarn was performed. Influences of nozzle pressure and yarn delivery speed on the amounts of exposed metal wire core were also studied. The results show that the motional characteristics of staple fibers in the wrapping process can be grouped into three main categories: fibers evenly covering the metal wire with a certain helix angle; trailing ends of the fibers being expanded on the spindle or loosely distributed around the metal wire in spiral configurations with their leading ends having wrapped around the metal wire; and leading ends of the fibers being in a free and separated state with their trailing ends having wrapped around the metal wire. The amount of the exposed metal wire core decreases first and then increases with the increase of the nozzle pressure, while it increases first and then decreases with the increase of the yarn delivery speed. The variation trend of the amount of exposed metal wire core with the process parameters is in accordance with the online monitored results.

Key words: vortex spinning, core-spun yarn, metal wire, online monitoring, industrial endoscope