Arrangement for mounting a screen

Details Arrangement for mounting a screen Arrangement for mounting a screen

D - Textiles, Paper

21

C

D21C 7/00 (2006.01) B01D 35/02 (2006.01) D21C 7/14 (2006.01)

Patent

CA 2409453

11 The present invention relates to an arrangement for mounting a screen (20) in a continuous digester used for making chemical pulp or paper pulp. Such a digester comprises a substantially cylindrical pressure vessel arranged in an upright position, the pressure vessel having a smaller diameter at the top end of the digester than at the bottom end of the digester, the diameter of the di- gester being changed at regionally defined areas by means of one or more conical sections (4). Said screens are mounted at these conical sections to remove liquid from chips or pulp in the digester. In the present arrangement an upper edge (21) of the screen (20), which, in the operating position, is located higher, is arranged in the region of the conical section (4). In particular, the screen extends substantially to the section of the conical section, which has the smallest diameter.

Dispositif pour le montage d'un classeur à tamis (20) dans un lessiveur en continu servant à fabriquer de la pâte chimique ou de la pâte à papier. Le lessiveur comprend un récipient sous pression cylindrique en position verticale, le diamètre de ce récipient étant inférieur à l'extrémité supérieure du lessiveur qu'à son extrémité, et le diamètre du lessiveur étant modifié à certains endroits par l'action d'une ou de plusieurs sections coniques (4). Les classeurs à tamis sont montés sur les sections coniques pour drainer le liquide des copeaux ou de la pâte dans le lessiveur. Dans l'agencement, un bord supérieur (21) du classeur à tamis (20), placé plus haut en position de fonctionnement, est placé au niveau de la section conique (4). Plus précisément, le classeur à tamis s'étend jusqu'au niveau de la section conique dont le diamètre est le plus petit.

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