Abstract: A condensing zone for condensing a drafted fiber strand is disposed downstream of a front roller pair of a drafting unit of a ring spinning machine. The condensing zone comprises a stationary sliding surface having a suction slit, over which the fiber strand is transported by an air-permeable transport belt. The condensing zone is bordered on its exit side by a nipping roller disposed on the transport belt. The nipping roller drives the transport belt and is in turn driven by the front pressure roller of the drafting unit. The front pressure roller is, for this purpose, connected with the nipping roller via a drive belt, preferably a toothed belt. The nipping roller and the front pressure roller are arranged on supporting arms which can be spread apart and which tension the drive belt.

Abstract: A condensing zone for condensing a drafted, still twist-free fiber strand is arranged downstream of a front roller pair of a drafting unit of a spinning machine. An air-permeable transport belt transports the fiber strand through the condensing zone. The transport belt slides hereby over a stationary sliding surface, in which a suction slit of a suction channel is located. At the end of the condensing zone, the fiber strand is pressed with the transport belt by a nipping roller to the sliding surface. The nipping roller as well as the front pressure roller of the drafting unit are supported in a top weighting arm. A separate pressure spring is arranged each for the top pressure roller and for the nipping roller. It can be provided that the nipping roller is arranged at a holding device, which can be swivelled around a swivel axle, which lies coaxially to the axle of the front pressure roller.

Abstract: An air-permeable transport belt, drivable by a drive roller, is provided for transporting a fiber strand to be condensed over a sliding surface of a spinning machine condensing zone which includes a suction slit. The transport belt has at least one area arranged to contact the drive roller, which area differs in relation to its surface structure from an area arranged to contact the sliding surface and from an area arranged to contact the fiber strand.

Abstract: In order to transport a fiber strand to be pneumatically condensed over a suction slit of a condensing zone of a spinning machine, a transport belt is provided which comprises, at least in the effective area of the suction slit, a porous area. The porous area can, for example, be created by dissolving granulate components from a fine-grained granulate blend.

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.