D - Textiles – Paper – 21 – F
Patent
D - Textiles, Paper
21
F
D21F 3/00 (2006.01) D21F 1/66 (2006.01) D21F 3/02 (2006.01) D21F 3/04 (2006.01)
Patent
CA 2055927
Method and device in the manufacture of paper or board for dewatering of a paper web that is being manufactured. The paper web is transferred from a forming wire onto a wire in the drying section while constantly on support of a fabric that receives water, a transfer fabric, or of any other, corresponding transfer surface as a closed draw, at a particularly high speed, which is higher than about 25-30 m/s. Dewatering of the paper web is carried out by means of at least two subsequent press nips, of which nips at least one press nip is a so-called extended-nip zone, whose length in a machine direction is larger than about 100 mm. The extended-nip zone is formed in connection with a mobile flexible press-band loop. The distribution of the compression pressure employed within said extended-nip press zone is regulated and/or selected both in the transverse direction of the web and in the machine direction so as to set or to control the different profiles of properties of the web.
Cette invention concerne une méthode et un dispositif d'essorage de la bande de papier ou de carton en cours de fabrication. La bande de papier est transférée de la toile de formation à une toile d'essorage dans la sécherie de la machine à papier, à très haute vitesse, soit plus de 25-30 mètres par seconde environ, sans jamais quitter une toile d'évacuation de l'eau, une toile de transfert ou tout autre habillage de tirage fermé. L'essorage de la bande de papier est réalisé par au moins deux pinces successives dont au moins une est du type allongé, c'est-à-dire dont la longueur dans le sens machine est supérieure à environ 100 mm. La pince allongée est formée d'une part par une bande de pressage souple et mobile. La répartition de la pression d'essorage dans la pince allongée est réglée et/ou choisie aussi bien dans le sens travers que dans le sens machine pour donner à la bande de papier différents profils de propriétés.
Hirsimaki Martti
Karvinen Mikko
Kivimaa Juha
Laapotti Jorma
Pajula Juhani
Sim & Mcburney
Valmet Corporation
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