Process for regenerating wastepaper using a double layer hydroxide formed in situ

US5227020A · kind A · utility

Assignee

• Henkel Kommanditgesellschaft auf Aktien · DE

Inventors

• Helmut Endres · Zusmarshausen, DE
• Maria Liphard · Essen, DE
• Klaus Hornfeck · Mettmann, DE
• Andreas Arnold · Werther, DE
• Guenter Geismar · Krefeld, DE

Key dates

• Filing date: Sep 23, 1991
• Grant date: Jul 13, 1993
• Expiry date: Sep 23, 2011

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02W30/64
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

In a process for processing waste paper, aqueous suspensions of pulp are treated with cationic layer compounds precipitated in situ. The separated printing inks, fillers and/or unwanted substances are then removed from the fibrous suspensions in a known manner by flotation or washing out.