Twin-wire former and process for separating upper and lower wires of HTE twin-wire former

US6214167A · kind A · utility

Assignee

• Voith Sulzer Papiertechnik Patent GmbH · DE

Inventors

• Gunter Halmschlager · Bezirk Krems an der Donau (Stadt), AT
• Franz Stelzhammer · Böheimkirchen, AT
• Alexander Wassermann · Wien, AT
• Jurgen Banning · Düren, DE
• Werner Leitenberger · Schlier, DE
• Thomas Elenz · Barueri, BR

Key dates

• Filing date: Mar 5, 1999
• Grant date: Apr 10, 2001
• Expiry date: Mar 5, 2019

Classification

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

Abstract

Twin-wire former for producing a fibrous material web from a fibrous suspension and process for separating upper and lower wires of the twin-wire former. The twin-wire former includes a twin-wire zone composed of a lower wire and an upper wire and a plurality of rolls including an inlet roll and an outlet roll. The upper wire is guidable over the plurality of rolls, the inlet roll guides the upper wire to the twin-wire zone, and the outlet roll guides the upper wire toward the inlet roll. A wedge-shaped inlet zone is formed between the upper wire and the lower wire and has an adjustable inlet wedge angle. An upper wire subassembly includes a drainage box adapted to receive suspension water that flows upwardly through the upper wire, and further includes a pivotable common support device, to which the drainage box and the inlet roll are mounted. A stroke device is coupled to the pivotable common support device to lift the pivotable common support device around a first horizontal axle. In this manner, the inlet wedge angle is varied during former operation. After a maximal inlet wedge angle is formed, continued lifting of the pivotable common support device by the stroke device cause…