Pressurized screen and process for removing contaminants from a fibrous paper suspension containing contaminants

US6613191B2 · kind B2 · utility

Assignee

• Voith Paper Patent GmbH · DE

Inventors

• Reimund Rienecker · Heidenheim, DE
• Peter Schweiss · Langenau, DE

Key dates

• Filing date: Dec 4, 2001
• Grant date: Sep 2, 2003
• Expiry date: Dec 4, 2021

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D21D5/026
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

Pressurized screen to remove contaminants from a contaminant-containing fibrous paper suspension. Pressurized screen includes a housing, a first screen element, essentially axially symmetric and rotatably mounted within housing, and a second screen element, which is essentially axially symmetric. First and second screen elements are successively arranged in suspension flow direction. At least one intake, coupled to housing, supplies suspension to housing, and at least one accepts outlet, coupled to housing, conveys a part of suspension that passes through the second screen element out of housing. At least one coarse reject outlet is located within housing to remove a part of suspension not passing through first screen element, and at least one fine reject outlet is located within housing to remove a part of suspension not passing through second screen element. First screen element includes conical shape with opening angle (&agr;) between about 10° and 170°.