Analyzing the path and the tension of a yarn under a false-twist process using a doubly stacked multi-disk spindle

摘要

The path followed by and the tension generated along a yarn under a false-twist process using an enlarged model unit of a doubly stacked multi-disk spindle are measured and analyzed on the basis of a theory, an extension of authors' earlier proposition. The geometrical quantities necessary to reproduce the yarn path, i.e. the inclination angle made by the yarn against a disk surface, the length along which the yarn runs on the disk, etc., are estimated from the CCD image of the yarn configuration. The twisting tension, the inter-disk yam tension, and the untwisting tension of the running yarn are also detected. It is revealed that the theoretical analysis can successfully elucidate and predict the inter-disk yam tension as well as the relation between the twisting tension and the untwisting tension only if the yarn configuration is observed. This study will give a novel and useful clue to the manufacturing technology related to false-twist processing using multi-disk spindles. © 2008 The Textile Machinery Society of Japan.