Long nip press roll arrangement

US4923570A · kind A · utility

Assignee

• J.M. Voith GmbH · DE

Inventors

• Karl Steiner · Herbrechtingen, DE
• Andreas Schutte · Heidenheim, DE
• Hans Flamig · Heidenheim, DE

Key dates

• Filing date: Mar 2, 1989
• Grant date: May 8, 1990
• Expiry date: Mar 2, 2009

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D21F3/045
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

A long nip press roll for removing water from a traveling fiber web. A rigid support beam has at least one recess in its periphery for receiving a radially movable hydraulically operated press shoe. A flexible tubular press shell is wrapped around the support beam and the press shoe. The concave outer surface of the press shoe presses the press shell against a backing roll for pressing upon a fiber web against a felt belt passing through the nip. The press shell has a smooth outer surface in contact with the web. At its outlet side from the press nip, the press shoe has a convexly curved guide surface over which the press shell and the paper web travel together and that guide surface is also wrapped for a distance by the felt belt. This separates the web from the felt belt and the web travels around on the press shell. A ledge inside the press shell and/or a removal roll at the outside of the press shell separate the web from the outside of the press shell. Plural press shoes defining plural press nips may be provided.