Multi-stage screening apparatus, screen basket and method...

D - Textiles – Paper – 21 – D

Patent

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D21D 5/02 (2006.01) D21D 5/16 (2006.01)

Patent

CA 2484353

A screening apparatus for screening pulp suspensions comprises a screen basket (8) dividing the interior of the housing into a central chamber (10) and a single outer annular chamber. The suspension is supplied to one of the outer and central chambers, so that an accept fraction passes through the screen, while a reject fraction develops that is prevented from passing through the screen. Dilution means (28) is provided for supplying diluting liquid to dilute the reject fraction. The screen basket is divided into at least two separate tubular screen sections (40,42). The dilution means includes at least one annular element (44) axially interconnecting the two tubular screen sections and forming a tubular dilution liquid compartment (46) extending at least substantially around the screen basket.

L'invention concerne un appareil pour classer des suspensions de pâte, comprenant un panier classeur (8) qui divise le boîtier dudit appareil en une chambre centrale (10) et en une seule chambre annulaire extérieure. La suspension est acheminée à la chambre extérieure ou à la chambre centrale de sorte qu'une fraction d'accepté passe à travers le classeur, tandis qu'une fraction de matières rejetées se forme et ne puisse pas passer à travers le classeur. Des moyens de dilution (28) acheminent le liquide diluant servant à diluer la fraction de matières rejetées. Le panier classeur est divisé en au moins deux sections de classage tubulaires séparées (40,42). Les moyens de dilution comprennent au moins un élément annulaire (44) qui assure l'interconnexion axiale des deux sections de classage tubulaires et qui forme un compartiment à liquide diluant (46) tubulaire, s'étendant au moins sensiblement autour du panier classeur. L'élément annulaire (44) forme une pluralité de passage d'éjection de liquide diluant entre le compartiment à liquide diluant et la chambre extérieure ou la chambre centrale. L'invention concerne en outre un panier classeur s'utilisant dans l'appareil décrit ainsi qu'un procédé pour classer des suspensions de pâte.

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