Abstract: A process is provided for producing an open-end spinning rotor assembly. A boron treatment material is applied only to the fiber collecting groove area of the rotor of the spinning rotor assembly. Subsequently, a spinning enhancement material is applied over the boron treated fiber collecting groove and over a sliding wall area of the rotor. An assembly treated with boron treatment material and spinning enhancement material is also provided.

Abstract: An opening assembly for an open-end spinning arrangement is provided which includes a steel alloy fitting ring element arranged on a rotatable roller body element for opening a silver into individual fibers. The fitting ring element includes a base wall having a radial thickness no greater than 2.2 mm, and includes a plurality of radially extended teeth unitary with the fitting ring element extending from the base wall. The teeth have lateral flanks formed by at least one cirumferential groove on an outer surface of the fitting ring element, and have front and back edges formed by at least two axially extending longitudinal grooves. The front and back edges have a radial height of about 0.75-0.80 times a radial height of the lateral flanks. The base wall radial thickness has a dimension of about 0.60-0.72 times the radial height of the lateral flanks. The height of the teeth is greater than the distance between the lateral flanks of axially adjacent teeth. The teeth are inclined toward a rotational direction.

Abstract: A method and apparatus is provided for treating the surfaces of a pair of rollers used in an open-end friction spinning unit containing a pair of friction rollers arranged in an operational position to form a wedge-shaped yarn-forming gap. The pair of friction rollers is treated prior to installation in a spinning unit by rotatably mounting the two friction rollers adjacent one another outside the spinning unit, causing the friction rollers to rotate on their longitudinal axes and simultaneously treating the surface of each friction roller with common treating element.

Abstract: A spinning rotor for an open-end spinning device and a method of making same is disclosed. A spinning rotor arrangement includes a shaft carrying a rotor including a sliding wall starting at one open face side of the rotor and diversing conically outward of the rotor axes. A fiber collecting groove is connected to the sliding surface and forms the greatest inner diameter portion of the rotor. The surfaces of the fiber collecting groove are hardened by a plastic deformation process.

Abstract: An opening roller and a process for making an opening roller for open-end spinning machines is disclosed where wavy shaped toothed rings and intermediate rings are alternately slid on a preferably cylindrical part. The toothed rings and the intermediate rings are clamped between axial stops. It is provided that during the clamping of the toothed rings and the intermediate rings between the axial stops, the intermediate rings are plastically deformed. Thus it is achieved that without narrow manufacturing tolerances, the toothed rings and the intermediate rings rest against one another without gaps so that fibers cannot be caught during use of the opening roller.