Drying section with additional press nip

US5666741A · kind A · utility

Assignee

• Voith Sulzer Papiermaschinen GmbH · DE

Inventors

• Alfred Bubik · Ravensburg, DE
• Erwin Brunmair · Murnau am Staffelsee, DE
• Harald F. Hess · Ravensburg, DE
• Herbert Holik · Ravensburg, DE
• Werner Leitenberger · Schlier, DE
• Thomas Merath · Weingarten, DE
• Johann Moser · Heidenheim, DE
• Helmet Stieb · Schlier, DE
• Elmer Weisshuhn · Weingarten, DE

Key dates

• Filing date: Mar 4, 1996
• Grant date: Sep 16, 1997
• Expiry date: Mar 4, 2016

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D21F3/0281
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

A drying section of a paper machine includes a plurality of individual drying groups, wherein the drying cylinders of a drying group are served by 2 respective dryer wire or felt that passes over drying cylinders of the drying group and presses a web to be dried against the surface of the drying cylinders. The invention is adapted for either single tier or double tier drying groups. At least one press roll is disposed between and separates two of the drying groups. In one embodiment, the at least one press roll forms a nip with the adjacent drying cylinder, either upstream or downstream, to define a dewatering nip through which the web passes. A dewatering belt passes over the press roll in the nip. The wire for a respective drying group is guided away from the dewatering nip so that only the web and the dewatering belt pass through the press nip. In alternate embodiments, two press rolls may be disposed between the adjacent drying groups, and the two press rolls define a press nip between them. A respective dewatering belt passes over each of the press rolls. One of those press rolls may also be in contact with and define a press nip with the adjacent drying cylinder in the adjace…