Apparatus with an impermeable transfer belt in a papermaking machine, and associated methods

US8075738B2 · kind B2 · utility

Assignee

• Metso Paper Karlstad AB · SE

Inventors

• Paul Douglas Beuther · Neenah, US
• Frank Stephen Hada · Appleton, US
• Jeffrey Dean Holz · Harrison, US
• Hans Ivarsson · Karlstad, SE
• Ingvar Berndt Erik Klerelid · Karlstad, SE
• Johan Ulf Ragard · Karlstad, SE

Key dates

• Filing date: Oct 26, 2007
• Grant date: Dec 13, 2011
• Expiry date: Jun 12, 2028

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D21F11/14
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

An apparatus for transferring a wet paper web from a press nip to a drying cylinder (52) of a papermaking machine, and for structuring the web, comprises an impermeable transfer belt (35) having a web-contacting surface, the wet paper web passing through the press nip enclosed between a press felt (33) and the transfer belt, and a permeable structuring fabric (37) for transfer of the web onto the drying cylinder, the structuring fabric having a structured surface and being arranged in a loop within which a suction transfer device (38) is disposed, said suction transfer device having a suction zone (41). According to the invention the web-contacting surface of the belt has a non-uniform distribution of microscopic-scale depressions, and that the suction zone includes a transfer point (40) spaced a distance D from the press nip along which the belt runs, the belt being arranged to bring the web into contact with the structuring fabric in the suction zone for a length L, such that suction is exerted on the paper web to transfer the paper web from the belt onto the structuring fabric. at the transfer point.