D - Textiles – Paper – 21 – F
Patent
D - Textiles, Paper
21
F
D21F 2/00 (2006.01) D21F 3/00 (2006.01) D21F 3/04 (2006.01) D21F 9/00 (2006.01)
Patent
CA 2336341
The invention relates to a former-press section (100, 110) of a paper machine and to a method of transferring a web from a former to a press section. Between the former section (100) and the press section (110) there is a pre- press zone (PP) which removes water from the web (W) and through which the web (W) is passed as a closed draw from the former section (100) to the press section (110). The upper wet wire (10) or the equivalent transfer wire (10A) of the former section (100) is passed through the pre-press zone (PP), the web (W) being passed on the lower face of said wire into and through the pre-press zone (PP). Inside the loop of the upper wet wire (10) or of the equivalent transfer wire (10A) and/or inside the loop of the lower wet wire (20) there are transfer devices (15, 15a, 16, 26) based on the use of a pressure difference. The transfer devices (15, 15a, 16, 26) are arranged to operate in connection with threading or an operational malfunction such that the web (W) is separated from the upper wet wire (10) or the equivalent transfer wire.
L'invention porte sur la section formeur-presse (100, 110) d'une machine à papier et sur un procédé de transfert de la bande du formeur à la presse. Entre le formeur (100) et la presse (110) se trouve une zone de prépressage (PP) qui extrait l'eau de la bande (W) alors qu'elle transite en tirage fermé du formeur (100) à la presse (110). La toile humide (10) supérieure ou la toile de transfert équivalente (10A) du formeur (100) traverse la zone de prepressage (PP) alors que la bande (W) passe sur la face inférieure de ladite toile puis traverse la zone de prépressage (PP). La boucle de la toile humide (10) supérieure ou celle de la toile de transfert équivalente (10A) et/ou celle de toile humide (20) inférieure comportent des dispositifs de transfert (15, 15a, 16, 26) utilisant un différentiel de pression. Les dispositifs de transfert (15, 15a, 16, 26) sont conçus pour réagir à l'engagement de la bande ou à un défaut de fonctionnement, et à provoquer la séparation la bande (W) d'avec la toile humide (10) supérieure ou la toile de transfert équivalente (10A), la bande tombant alors dans une fosse à toile, un triturateur ou l'équivalent situé dessous.
Honkalampi Petter
Laapotti Jorma
Metso Paper Inc.
Sim & Mcburney
Valmet Corporation
LandOfFree
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