Method and apparatus to produce paper webs coated on both sides

US6599395B2 · kind B2 · utility

Assignee

• Voith Sulzer Papiermaschinen GmbH · DE

Inventors

• Hans-Jurgen Wulz · Heidenheim, DE
• Rudiger Kurtz · Heidenheim, DE
• Gerhard Kotitschke · Steinheim, DE
• Bernhard Kohl · Heidenheim, DE
• Peter Petermann · Dinslaken, DE
• Erhard Gruber · Satteldorf, DE

Key dates

• Filing date: Aug 28, 2001
• Grant date: Jul 29, 2003
• Expiry date: Sep 11, 2021

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D21H23/56
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

A method of producing paper webs coated on both sides includes the following steps: a) indirectly applying a liquid onto the paper web by passing the web through at least one nip formed by a roll and a counterelement, whereafter the web is dried; b) next, directly applying coating mixture at surplus only on one side of the web, whereafter the surplus coating mixture is removed again by use of a doctor element, the web being dried again thereafter; and c) lastly, directly applying coating mixture at surplus only on the other web side, whereafter the surplus coating mixture is removed by use of a doctor, whereafter the web is dried again. In the indirect application of liquid in the nip, or in the nips, either coating mixture to produce so-called MWC papers or a sizing suspension to produce so-called LWC papers is selectively applied.