Longitudinal wire papermaking machine

US4459175A · kind A · utility

Assignee

• Escher Wyss GmbH · CH

Inventors

• Alfred Bubik · Ravensburg, DE
• Hans Dahl · Ravensburg, DE
• Herbert Holik · Ravensburg, DE
• Rudiger Kurtz · Heidenheim, DE
• Werner Seider · Ravensburg, DE

Key dates

• Filing date: Sep 16, 1982
• Grant date: Jul 10, 1984
• Expiry date: Sep 16, 2002

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D21F9/02
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

A longitudinal wire papermaking machine is disclosed wherein the longitudinal wire is guided in a dewatering region, following a pre-dewatering path, out of a wire plane downwardly over a deflection element and then upwardly over a downwardly domed or arched dewatering element towards the wire plane. The deflection element is arranged at a spacing K=approximately 15 to 80 mm from the dewatering element. The longitudinal wire is guided at the inlet section of the dewatering region, located between its outbound or run-off location at the deflection element and its lowest deflection location, over a negative pressure zone, for instance constituted by a suction chamber, which is effective at its underside. Hence, at the inlet section there is obtained a reduction in the suspension pressure and the fiber stock suspension is guided with an approximately constant total thickness lower into the dewatering region, i.e. at a relatively flat angle towards the dewatering element, so that there is avoided any backflow at the surface region of the suspension.