Method for defiberizing waste paper in a thick stock range

US4538765A · kind A · utility

Assignee

• Escher Wyss GmbH · CH

Inventors

• Hermann Mayr · Munich, DE
• Albrecht Kahmann · Weingarten, DE
• Gerhard Lambrecht · Weingarten, DE
• Wolfgang Heinbockel · Weingarten, DE
• Wolfgang Siewert · Ravensburg, DE
• Josef Maier · Eichstätt, DE

Key dates

• Filing date: Dec 6, 1982
• Grant date: Sep 3, 1985
• Expiry date: Dec 6, 2002

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D21B1/345
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

Waste paper is defiberized within a container or receptacle in a thick stock range at a low water level. Thereafter, by further infeeding water, the obtained slurry or the like is diluted to a consistency of less than 7% while continuing the defiberizing operation. Finally, the obtained stock suspension is withdrawn through a sieve or screen located at the floor of a defiberizing container. The defiberizing container or receptacle used for performing the method possesses a lower region having a smaller diameter, above which there is located an upper region having a larger diameter.