Drying unit and dryer section that makes use of such units

D - Textiles – Paper – 21 – F

Patent

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Details

D21F 5/04 (2006.01) D21F 5/18 (2006.01)

Patent

CA 2287279

The invention concerns a drying unit in the dryer section of a paper or board machine, in which drying unit there is a loop of a drying wire (32; 32a, 32b, 32c, 32d). The drying unit comprises a large-diameter D1 impingement-drying and/or through-drying cylinder (31), which is fitted inside the drying-wire loop (32, 32a, 32b, 32c, 32d). On top of said cylinder (31) and/or in the vicinity of said cylinder, at both sides, smooth-faced heated contact-drying cylinders (30) are placed, whose diameter D2 < D1. The impingement-drying and/or through-drying cylinder (31) is placed in the spaces (KT) underneath the floor level (K1-K1) of the paper machine hall and provided with an openable and closable blow hood (35) so that the removal of broke out of connection with the hood (35) takes place substantially by the force of gravity. The central axes of the contact-drying cylinders (30) placed in the vicinity of said cylinder (31) are placed in the vicinity of, or above, the floor level (K1-K1) of the paper machine hall. The curve sector b of the paper web (W) on the outer face of the drying wire (32; 32a, 32b, 32c, 32d) over said cylinder (31) is b > 180°.

L'invention concerne une unité de séchage, située dans la section séchante d'une machine à papier ou à carton. Cette unité de séchage comprend une boucle de toile de séchage (32; 32a, 32b, 32c, 32d). Cette unité de séchage comprend également un cylindre de séchage par convection et/ou de séchage intégral à gros diamètre D1 (31), placé à l'intérieur de ladite boucle de toile de séchage (32; 32a, 32b, 32c, 32d). On place au-dessus de ce cylindre (31) et/ou à proximité de celui-ci, sur chaque coté, des cylindres de séchage à chaud lisses et chauffants (30), dont le diamètre D2 est inférieur à D1. Le cylindre de séchage par convection et/ou de séchage intégral (31) est placé dans les espaces (KT) situés en-dessous du niveau du sol (K1-K1) de la salle où se trouve la machine à papier. Ce cylindre est pourvu d'une hotte soufflante (35) pouvant être ouverte et fermée, de sorte que la réparation de toute rupture de raccordement à ladite hotte (35) s'effectue sensiblement par force de gravité. Les axes principaux desdits cylindres de séchage à chaud (30), adjacents audit cylindre (31), sont situés à proximité ou au-dessus du niveau du sol (K1-K1) de la salle de la machine à papier. La partie courbe b de la bande continue de papier (W) sur la surface extérieure de la toile de séchage (32; 32a, 32b, 32c, 32d) au-dessus du cylindre (31) est b supérieur à 180 DEG .

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