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In the friction-twist processing using a multi-friction-disk unit, which is applied widely to manufacture the “textured yarn”, the yarn is constrained to contact with the disks one after another. The inclination angle and wrapped angle on the individual disk surface are very significant factors for the designer to estimate the value of the generated twist and the tension. The main purpose of this paper is to measure these angles formed on each of the multi-disks in frictiontwisting device used in manufacturers. The second purpose is to compare these angles obtained by experiment with the values which are estimated by the theory reported in our recent articles.The experimental inclination angle is slightly greater than the calculated value on the assumption that yarn path forms a geodesic line on the disk surface. On the other hand, the contact thickness which is calculated by the wrapped angle was in good agreement with observations in the experiment. The yarn path was plotted on the overlap triangle which is the over-view representing the overlapped part of the disks. Then, it was found that the suitable disk size gave a symmetrical yarn path except the entrance disks, while the disks which had excessive diameters could not realize a symmetrical yarn path

Yarn Path in Friction False Twisting. Part 3: Inclination Angle on the Disk Surface of Multi-disk Unit.