Method and device for removal of water out of a paper or...

D - Textiles – Paper – 21 – F

Patent

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Details

D21F 3/00 (2006.01) D21F 2/00 (2006.01) D21F 3/02 (2006.01) D21F 3/04 (2006.01)

Patent

CA 2233608

The invention concerns a method and a device for removal of water out of a paper or board web and for passing said web as a closed draw from the forming wire (10; 10A) or transfer wire (10W) of the web former to the press section and through one or several dewatering press nips (N1, NP1, NP2) in said press section. The web that runs on the forming wire (10; 10A) or on the transfer wire (10W) is made to adhere, in a transfer and pre-press zone (PN, PN0, PN10, PN OO, PN1, PN2), to the outside face of a transfer belt (20; 20A; 20B) substantially not recciving water. After this pre-press zone, the web is separated substantially immediately from said wire (10; 10A; 10W) and passed on support of the transfer-belt loop (20; 20A; 20B) onto the next press fabric in the press section and/or into the next press nip. In the pre-press zone or zones, a substantial amount of water is removed out of the web substantially in one direction only, and, at the same time, the web is made to adhere reliably to the outside face of the transfer-belt loop (20; 20A; 20B).

L'invention porte sur un procédé et un dispositif permettant d'égoutter l'eau se trouvant dans des bandes de papier ou de carton et de les faire passer, comme en circuit fermé, de la toile de formation (10, 10A) ou de la toile de transfert (10W) du formeur de bandes à la partie de pressage ainsi que par un ou plusieurs rouleaux pinceurs de presse d'égouttage (N1, NP1, NP2) situés dans la partie de pressage. La bande continue qui défile sur la toile de formation (10, 10A) ou de transfert (10W) est rendue adhésive, dans une zone de transfert et de pré-pressage (PN, PNO, PN1O, PNOO, PN1, PN2), à la surface externe d'une courroie de transfert (20, 20A, 20B) ne recevant quasiment pas d'eau. Une fois passée cette zone de pré-pressage, la bande se sépare presque immédiatement de ladite toile (10, 10A, 10W) et passe sur un support de la boucle à courroie de transfert (20, 20A, 20B) sur le tissu de presse suivant dans la partie de pressage et/ou sur le rouleau pinceur de presse suivant. Dans la ou les zones de pré-pressage, une importante quantité d'eau est égouttée de la bande sensiblement dans une seule direction tandis que, dans le même temps, cette bande est rendue adhésive et ce, dans de bonnes conditions de fonctionnement, sur la surface externe de la boucle à courroie de transfert (20, 20A, 20B).

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