Looking inside an interlaced yarn
Abstract
The talk will be about the so called “interlacing process”, that causes the formation of knots in a yarn. In the first part will be presented the state of the art of the studies that concern the interlacing process. From these studies emerges that the process is related to the shock waves that form in the channel for the yarn, but the dynamics of the interaction between the yarn and the compressed air stream and the localization of the knots formation are still not clear. Taking into account these considerations it is spontaneous to access the second part of the talk, that will be about two approaches for the investigation of the interlacing process. The first one is a visual approach, that consists in the reconstruction of the dynamics of the yarn in the channel by means of high speed videos. The second idea consists in the exploitation of the periodicity of the knots formation process, in order to find a typical frequency by means of pressure and acceleration sensors.