Twin-wire former

US5507918A · kind A · utility

Assignee

• J.M. Voith GmbH · DE

Inventors

• Hubert Polifke · Heidenheim, DE
• Franz Pisinger · Heidenheim, DE
• Udo Grossmann · Heidenheim, DE
• Sven-Ake Sahlin · Skoghall, SE
• Hans-Peter Sollinger · Heidenheim, DE
• Dieter Egelhof
• Christian Schiel · Heidenheim, DE
• Thomas Zufle · Heidenheim, DE

Key dates

• Filing date: Feb 2, 1994
• Grant date: Apr 16, 1996
• Expiry date: Feb 2, 2014

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D21F9/006
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

The twin-wire former serves for the production of a web of paper or board. Two wire belts (endless wire loops 11 and 12) form a twin-wire zone with each other. Within the twin-wire zone, the one wire belt (12) travels over rigid ledges (28', 28) which are arranged spaced apart from each other on a water-removal box (18). Within the twin-wire zone, furthermore, the other wire belt (11) travels over several ledges (27) which lie opposite the rigid ledges (28), are supported by means of resilient elements (springs 24, pneumatic pressure cushions, or the like), and can be pressed with a selectable force against the other wire belt. Within one of the wire loops (for instance 11), bridging at least two of the ledges (27) present there, a closed wire support surface (9) is provided. A secondary headbox (10') can be arranged in front of the closed wire support surface (9).