Zoned pressure screen

D - Textiles – Paper – 21 – D

Patent

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Details

D21D 5/06 (2006.01) B01D 29/11 (2006.01) B01D 33/06 (2006.01) B07B 1/20 (2006.01)

Patent

CA 2271155

A pressure screen (10) for screening a suspension of papermaking stock employs a cylindrical screen means (20) which comprises a single screen or a plurality of axially aligned screens and in which the stock screening regions are arranged in annular zones (22a, 22b, 22c) with a rejects region (24a, 24b) located between the screening zones. The intermediate rejects regions shorten the distance which contaminants must move across the inlet surface of the screen and reduce the buildup of concentration of rejects on the screen surface, thereby optimizing the performance of the screen.

Cette invention concerne un épurateur sous pression (10) conçu pour classer les éléments d'une suspension de pâte à papier, qui utilise un organe cylindrique à épurateurs (20) comportant soit un épurateur unique soit une pluralité d'épurateurs axialement alignés et dans lesquels les régions de classage de la pâte sont agencées en zones annulaires (22a, 22b, 22c), des régions de rejet (24a, 24b) étant définies entre les zones de classage. Les régions intermédiaires de rejet diminuent la distance que doivent parcourir les contaminants à la surface de l'orifice d'entrée de l'épurateur et réduisent la possibilité de formation d'une concentration des rejets à la surface de l'épurateur, ce qui optimise les résultats obtenus avec un tel épurateur.

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