Double wire sheet former

D - Textiles – Paper – 21 – F

Patent

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Details

D21F 9/00 (2006.01)

Patent

CA 2147381

A two-wire former of a paper-making machine has the following characteristics: (1) two continuous, loop-shaped wires form together an inlet gap for the paper pulp suspension; (2) a sheet forming zone has a section in which both wires are guided parallel to each other; (3) a plurality of guide rollers are arranged inside and outside both wire loops; (4) a roller associated to each wire loop deflects the associated wire at the beginning of the parallel section; (5) at least one of both inlet rollers has a circumferential area that forms no closed surface (forming roller). According to the invention, (6) both wires run on the paper pulp-bearing section in a substantially horizontal direction; (7) the top wire is separated from the bottom wire by a separating suction box with a curved surface; (8) the dewatering element that follows the forming roller on the same side of the wire is provided with elastically suspended dewartering strips.

Un formeur à deux toiles d'une machine a papier a les caractéristiques suivantes: (1) deux toiles (1, 2) continues en boucle forment ensemble une fente d'entrée de la suspension de pâte à papier; (2) une zone de formation de feuille comprend une section dans laquelle les deux toiles sont guidées parallèlement l'une à l'autre; (3) une pluralité de rouleaux de guidage sont situés à l'intérieur et à l'extérieur des deux boucles de toile; (4) un rouleau (3, 4) associé à chaque boucle de toile dévie la boucle de toile correspondante au début de la section parallèle; (5) au moins un des deux rouleaux d'entrée (3, 4) a une circonférence qui ne forme pas une surface fermée (rouleau de formation). Selon l'invention, (6) les deux toiles se déplacent sensiblement dans le sens horizontal dans la section de support de la pâte à papier; (7) la toile supérieure est séparée de la toile inférieure par une caisse aspirante de séparation (8) à surface courbe; (9) l'élément de déshydratation (7.1) qui suit le rouleau de formation de la feuille du même côté de la toile est pourvu de barres de déshydratation (7.3) élastiquement suspendues.

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