Method for calendering a paper or cardboard web

US5163364A · kind A · utility

Assignee

• Sulzer-Escher Wyss GmbH · CH

Inventors

• Alfred Bubik · Ravensburg, DE
• Hans Dahl · Ravensburg, DE
• Rudiger Kurtz · Heidenheim, DE
• Herbert Holik · Ravensburg, DE
• Peter Mirsberger · Weingarten, DE
• Harald F. Hess · Ravensburg, DE

Key dates

• Filing date: Oct 19, 1989
• Grant date: Nov 17, 1992
• Expiry date: Oct 19, 2009

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D21G1/006
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

Calendering takes place in a calendering zone which operates under pressure with application of temperature and moisture. The desired smoothness is achieved with a correspondingly long dwell time of the material web in a correspondingly long calendering zone in view of the speed of web travel. A web which is still wet is guided between parallel heatable surfaces which are arranged on both sides of the web and face each other through the web and can each be pressed against the web. The surfaces are designed to form and hold a given precise contour of the calendering zone over its full length. One surface is constructed e.g. as a casing of a heated roller and the second surface is constructed as an endless flexible belt which can be pressed in a direction towards the roller casing by means of a concave supporting element. If wished, the web can be calendered on both sides with the method.