Control of yarn tension is one of the most important factors in knitting industry. Yarn input tension (YIT) to the knitting zone must be maintained between limits in order to produce knitted fabric without faults. For preventing faults, however, YIT is not the only parameter to control and monitor. The knitting elements and the knitting machine itself should be monitored to improve productivity and quality. As far as YIT is concerned, defects may be prevented or quickly detected by using YIT as a means of process control. This has been found to be a valuable approach to accomplish this task, since it reflects the general behavior of the knitting machine. There are several ways to control YIT which are being practiced now-a-days or which can be implemented industrially as innovative means to control the whole process. Monitoring, measurement and control of yarn tension in knitting process have been discussed briefly in this article.
If yarn tension is controlled properly during knitting, it gives an improved and uniform fabric appearance. The main objective of knitters is to feed yarn to the knitting point at a low and uniform tension. In the present article, several ways to control yarn tension have been discussed including new approaches.