Backwater cycle and process for the water circulation of a paper machine

US6497788B1 · kind B1 · utility

Assignee

• Voith Sulzer Papiertechnik Patent GmbH · DE

Inventors

• Klaus Prechtel · Heidenheim, DE
• Ingolf Cedra · Heidenheim, DE

Key dates

• Filing date: May 12, 2000
• Grant date: Dec 24, 2002
• Expiry date: May 12, 2020

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D21F1/66
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

Backwater cycle of and process for circulating water in a paper machine having a wet zone. The backwater cycle includes at least one application device arranged to apply a composition containing at least one of pigment and filler onto a fiber web in the wet zone, a first backwater cycle that supplies a stock inlet with backwater removed from the production process upstream, relative to a web travel direction, of the at least one application device, and a second backwater cycle that accepts a remainder of the backwater. The process includes extracting backwater from the fiber web, and feeding backwater, which is not charged with the at least one of pigments and fillers, to a stock inlet.