Process for forming a multi-ply fiber web

US6702926B1 · kind B1 · utility

Assignee

• Voith Sulzer Papiermaschinen GmbH · DE

Inventors

• Dieter Egelhof
• Alfred Bubik · Ravensburg, DE
• Peter Mirsberger · Weingarten, DE
• Otto L. Heissenberger · Graz, AT
• Frank Herzog · Lichtenfels, DE
• Wolf Dieter Baumann · St. Pölten, AT
• Josef Bachler · St. Gertraud, AT
• Gunter Halmschlager · Bezirk Krems an der Donau (Stadt), AT
• Frank Stelzhammer · Böheimkirchen, AT
• Gunther Mohrhardt · Encantado, BR

Key dates

• Filing date: Jun 29, 2000
• Grant date: Mar 9, 2004
• Expiry date: Jun 29, 2020

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D21F11/04
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

A wire section for forming a multi-ply fiber web. The wire section includes a first belt which advances a first fiber ply toward a couch roll defining a combining section. A twin-wire zone of the wire section includes first and second wires between which a second fiber ply is initially formed in a gap former. The second wire separates from the first wire and then the first wire supporting the second fiber ply meets the first belt supporting the first fiber ply at the couch roll of the combining section to form the multi-ply fiber web. The twin-wire part is arranged upstream of the combining section along the running direction of the first belt. The second fiber ply runs on the first wire into the combining section at an angle less than 90° with respect to the belt entering the combining section. The path of the wires from the forming roll to the combining section is disclosed. A suction box or arrangement holds the second fiber ply to the first wire when the first and second wires separate. Dewatering foils press on the wires moving through the twin-wire zone.