Filter material in the form of flexible leaves or sheets and a method of producing such material

US5223139A · kind A · utility

Assignee

• Seitz-Filter-Werke Theo & Geo Seitz GmbH und Co. · DE

Inventors

• Helmut Ruger · Pfaffen-Schwabenheim, DE
• Gerd Ritter · Heidelberg, DE
• Hans-Jürgen Hofmann · Rottendorf, DE
• Peter P. Breitbach · Bretzenheim, DE

Key dates

• Filing date: Apr 9, 1990
• Grant date: Jun 29, 1993
• Expiry date: Apr 9, 2010

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01D2239/1241
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A flexible fleece-like filter material is provided wherein in a matrix-like basic framework consisting of synthetic or natural fibres, ultra-finely fibrillated fibres and/or inert porous particles are incorporated as a filter medium, the filter medium forming, anchored in the matrix, chain structures provided with a cationic or anionic charge or possibly charged with other substances which influence the filtering properties or with immobilised cells and/or catalysts. A fleece is formed with a thickness of between 0.5 mm and 5 mm and preferably up to 2 mm, which is flexible and which can even be pleated. This filter material can be produced by a simple method without harming the environment.