A wound dressing for use in vacuum wound therapy comprising a wound contact layer which is an open structure comprising a yarn comprising gel-forming filaments or fibres, the structure having a porosity which allows exudate to flow through it.

A divided housing with a rotor assembly of a rotor spinning machine and a method for installing the rotor assembly in the divided housing of the rotor spinning machine. To propose a housing with a rotor assembly of a rotor spinning machine which allows a particular precise adjustment of the spinning rotor position, in particular in an axial direction of the rotor shaft, and which significantly reduces the forces due to vibrations or imbalances and accordingly reduces the wear of the rotating parts and in particular the rotor shaft bearing substantially, the divided housing with a rotor assembly has a rotor assembly with a spinning rotor, a rotor shaft and at least one rotor shaft bearing, and the divided housing has a rotor section and a bearing section, the rotor section surrounding the spinning rotor and the bearing section enclosing at least a part of the rotor shaft as well as at least one rotor shaft bearing, wherein in the bearing section the housing is at least partially divided parallel to a longitudinal housing axis into two separate parts, the first part being a housing body extending over the rotor section as well as the bearing section and the second part being a housing cap closing an open part of the housing body in the bearing section.

A method is provided for identifying a spinning rotor on a rotor spinning machine, wherein the spinning rotor is mounted in a suspended manner in a radially acting magnetic bearing during a spinning operation. At least one system variable that varies between different spinning rotors is identified. The system variable is detected and compared to at least one reference value. The system variable is one or a combination of: an energy consumption of the magnetic bearing; a radial position of the spinning rotor; or a resonant frequency of the spinning rotor. A rotor spinning machine that carries out the method is also provided.

A method is provided for identifying a spinning rotor on a rotor spinning machine, wherein the spinning rotor is mounted in a suspended manner in a radially acting magnetic bearing during a spinning operation. At least one system variable that varies between different spinning rotors is identified. The system variable is detected and compared to at least one reference value. The system variable is one or a combination of: an energy consumption of the magnetic bearing; a radial position of the spinning rotor; or a resonant frequency of the spinning rotor. A rotor spinning machine that carries out the method is also provided.

A thread draw-off nozzle for an open-end rotor spinning device includes an entrance-side nozzle funnel and an exit-side nozzle bore adjoining the nozzle funnel. A plurality of notches are arranged in the nozzle funnel and extend essentially radial to the nozzle bore. Each notch has an inlet wall, a baffle wall, a radially outer notch inlet, and a radially inner notch outlet. Each notch further includes an essentially flat notch bottom arranged between the inlet wall and the baffle wall.

A thread draw-off nozzle for an open-end rotor spinning device includes an entrance-side nozzle funnel and an exit-side nozzle bore adjoining the nozzle funnel. A plurality of notches are arranged in the nozzle funnel and extend essentially radial to the nozzle bore. Each notch has an inlet wall, a baffle wall, a radially outer notch inlet, and a radially inner notch outlet. Each notch further includes an essentially flat notch bottom arranged between the inlet wall and the baffle wall.

A method for producing a rotor cup for an open-end spinning rotor includes forming separating structures on a front-side rim of the rotor cup for breaking up and preparing a yarn end for piecing. The separating structures are formed by a non-mechanical manufacturing method without contact between the front-side rim and a mechanical forming tool. A rotor cup formed in accordance with the method is also provided.

A method for producing a rotor cup for an open-end spinning rotor includes forming separating structures on a front-side rim of the rotor cup for breaking up and preparing a yarn end for piecing. The separating structures are formed by a non-mechanical manufacturing method without contact between the front-side rim and a mechanical forming tool. A rotor cup formed in accordance with the method is also provided.

A thread draw-off nozzle for an open-end rotor spinning device includes a front surface, a nozzle bore, and a funnel-shaped yarn deflection surface connecting the front surface and the nozzle bore. The front surface adjoins the yarn deflection surface. The front surface and the yarn deflection surface form an effective diameter (D.sub.W) of the thread draw-off nozzle. The effective diameter (D.sub.W) of the thread draw-off nozzle is less than 8 mm, and the yarn deflection surface comprises a radius of curvature (R) of less than 2.5 mm.

A thread draw-off nozzle for an open-end rotor spinning device includes a front surface, a nozzle bore, and a funnel-shaped yarn deflection surface connecting the front surface and the nozzle bore. The front surface adjoins the yarn deflection surface. The front surface and the yarn deflection surface form an effective diameter (D.sub.W) of the thread draw-off nozzle. The effective diameter (D.sub.W) of the thread draw-off nozzle is less than 8 mm, and the yarn deflection surface comprises a radius of curvature (R) of less than 2.5 mm.