Modular screen cylinder and a method for its manufacture

D - Textiles – Paper – 21 – D

Patent

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D21D 5/16 (2006.01)

Patent

CA 2240101

An apparatus and method for screening wood pulp and other fibrous fluid suspensions. The apparatus and method relate to rebuildable, modular screen cylinders for screening thick pulp slurry in pulp and paper applications. The screen sections of the modular screen cylinder of the present invention are of a nonwelded construction. A lap joint according to the present invention is provided in each screen section connecting the ends of the individual sections when the screen sections are rolled into cylindrical shape. As a result, the lap joint of the current invention provides for a nonwelded, modular screen cylinder which is less expensive to manufacture and provides for increased wear life and durability as compared to similar screen baskets previously known.

La présente invention a pour objet une installation ainsi qu'une méthode pour le criblage de la pâte de bois et autres suspensions liquides contenant des matières fibreuses. L'installation et la méthode en question font appel à des cylindres de criblage modulaires pouvant être reconditionnés pour le criblage de pâtes épaisses dans les applications de fabrication du papier. Les sections de criblage des cylindres modulaires visés par les présentes sont assemblées sans soudage. L'assemblage des extrémités des sections individuelles est assuré par un joint à recouvrement qui est visé par les présentes et qui est réalisé lors de l'opération de formage où les sections reçoivent leur forme cylindrique. Le joint à recouvrement visé par les présentes permet la fabrication d'un cylindre de criblage modulaire, assemblé sans soudage et qui, produit à moindre coût, offre des caractéristiques de résistance à l'usure et de durabilité supérieures à celles des paniers de criblage utilisés antérieurement.

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