Abstract: In the case of a process for producing a twisted yarn from slivers that are drawn to the desired size and subsequently are prestrengthened by means of pneumatic false twisting, it is provided that the fiber ends in the form of helixes are wound around the core with such a steep slope that, during the twisting, the fiber ends that were previously wound around the core are wound off the core as much as possible.

Abstract: A supporting disk apparatus for engagement with an open-end spinning rotor shaft is provided. Supporting disk elements are provided for engaging the rotor shaft. The supporting disk elements include an outer circumference area providing a running surface for the rotor shaft. The outer circumference area is constructed such that this area is elastically deformed by the rotor shaft. Ring groove elements are provided around and extend into the supporting disk elements outer circumference area. The ring groove elements have a depth in a radial direction of the supporting disk elements slightly larger than the elastic deformation of the outer circumference area in the radial direction of the supporting disk elements which is caused by the rotor shaft. This supporting disk apparatus provides a reduction of heat build-up of the running surface of the supporting disk elements.