Twin-wire former for the production of a web of paper

US5019214A · kind A · utility

Assignee

• J.M. Voith GmbH · DE

Inventors

• Albrecht Meinecke · Heidenheim, DE
• Dieter Egelhof
• Wilfried Weiss · Oberursel, DE

Key dates

• Filing date: Dec 15, 1989
• Grant date: May 28, 1991
• Expiry date: Dec 15, 2009

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D21F9/003
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

A twin-wire former for the production of a web of paper from a fiber suspension. An upper endless loop of wire belt having a lower horizontal run and a lower endless loop wire belt having an upper horizontal run. Guide rolls support the wire belts to define a twin-wire zone. The upstream inlet wedge of the twin-wire zone is disposed at the outlet from a head box. The initial part of the path of the twin-wire zone has a gradual curvature convexly with respect to the lower wire belt, and in that initial portion are positioned guide tables, suction boxes and dewatering elements. This curved initial part is followed by a forming roll within the loop of the upper wire belt. The twin-wires wrap an arcuate sector of the lower region of the forming roll. A support roll follows the forming roll. The support roll is upraised sufficiently to wrap the twin-wires around the bottom of the forming roll and over an arcuate sector at the top of the support roll. Following the support roll, the upper wire separates from the lower wire. In the continuing generally horizontal, slightly descending path of the lower wire with the web on it are disposed a plurality of suction boxes and a lower wire sucti…