Friction disc for false twisting devices

A friction disc for a false twisting device for crimping thread, said device having a twisting tube, said friction disc having a pair of faces and a peripheral surface therebetween, said peripheral surface when the disc is associated with the tube on the false twisting device being in the path of oil flung from the thread by the tube as the thread is twisted, that face of the disc which faces the said tube intersecting the said surface in an abrupt edge from which oil flowing over the face towards the surface will be thrown by centrifugal force as the disc rotates, and an annular groove in said peripheral surface adjacent to but spaced from said abrupt edge, said groove having a closed end of smaller cross-section than the cross-section of its open end and an inclined wall between the closed end and mouth adjacent to the said abrupt edge intersecting the surface to form a second edge from which any oil moving over the first edge on said surface is removed by centrifugal force as the disc rotates.