Barmag Ag

Leybold Vacuum Gmbh

Hans-Rochus Gross

Frank B&auml;cker

Thomas Dreifert

Wolfgang Giebmanns

Hartmut Kriehn

Mario Maranca

A vacuum pump () comprises at least one rotor shaft () having a rotor section () with a rotor (), a bearing section () with a bearing (), and a shaft sealing system () that is axially situated between the rotor section () and the bearing section (). The shaft sealing system () axially comprises, on the side of the rotor, a gas seal () and, on the side of the bearing, an oil seal (). The shaft sealing system () additionally comprises, between the gas seal () and the oil seal (), a separating chamber, which surrounds the rotor shaft () and is ventilated by at least one separating chamber ventilation duct (). This enables the pressure difference that decreases via the gas seal and the pressure difference that decreases via the oil seal to be adjusted. An appropriate adjustment can prevent oil on the bearing side from passing through the oil seal toward the separating chamber.

Vacuum pump

A spinning apparatus for producing a plurality of yarns, wherein the yarns are produced by combining a plurality of filament bundles. To this end, the spinning apparatus includes a plurality of extruders for producing a plurality of melt flows, which are distributed by a plurality of distributor pumps to at least two spinning positions that are arranged side by side. Each of the spinning positions includes a plurality of spinnerets, which extrude a partial flow from a distributor pump to a filament bundle. Also, the spinning positions are arranged so that at least one filament bundle of one spinning position can be combined to a yarn with at least one filament bundle of an adjacent spinning position.

Yarn melt spinning apparatus and method

The invention relates to a method and an apparatus for spinning and crimping a multifilament yarn, and wherein a thermoplastic melt is extruded through a spinneret to form a filament bundle. The filament bundle is divided into a plurality of bundle components before being crimped. Each bundle component is separately crimped and combined to a multifilament yarn after being crimped. The yarn is subsequently wound to a package.

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Bergisch Gladbach, Germany

Hans-Rochus Gross