D - Textiles – Paper – 21 – F
Patent
D - Textiles, Paper
21
F
D21F 5/18 (2006.01)
Patent
CA 2297731
A method and apparatus achieve a more sustainable lift of a wet or heavy pulp web from a pulp machine to the topmost drying level of a pulp drying, allowing the speed of production to be increased and runnability problems to be minimized. The pulp web is lifted from the last press of the pulp machine to the topmost of the drying levels of the pulp dryer by supporting the web on a support wire. The pulp may be passed through the topmost drying level, and one or two other levels, also supported by a support wire, but in subsequent levels the pulp web is preferably supported only by an air cushion. In each level drying gas is blown toward the pulp web (preferably from both above and below the web) to effect drying, and the web passes around turning rolls between each drying level to enter the next, lower, drying level. The support wire may be of metal or plastic, and has a texture significantly coarser than the texture of wires commonly used in pulp machines.
La présente invention concerne un procédé et un dispositif utilisés pour sécher une bande de pâte dans un sécheur de pâte (10), le dispositif comprenant plusieurs niveaux de séchage (20, 44, 22) disposés les uns au-dessus des autres. Ces niveaux consistent en deux rangées de caissons de soufflage (38, 40, 38', 40') dont les surfaces de buses se font face. La bande de pâte à sécher, soutenue par le support de toile, est amenée jusqu'au point de départ (16), au niveau de séchage supérieur (20). La bande de pâte passe ensuite comme une toile d'enroulement à travers les autres niveaux de séchage (44, 22) jusqu'à la partie inférieure du sécheur de pâte. Des cylindres en rotation (4, 14') guident le passage de la bande de pâte (12) d'un niveau de séchage à un autre.
Gowling Lafleur Henderson Llp
Metso Paper Inc.
Valmet Corporation
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