Press section with two extended nip presses for the production o

Details Press section with two extended nip presses for the production o Press section with two extended nip presses for the production o

1989-05-05

1991-01-29

Hastings, Karen M.

Paper making and fiber liberation

Apparatus

Running or indefinite length product forming and/or treating...

162358, D21F 304

Patent

active

049884107

ABSTRACT:
A press section of a paper machine is of the type having two extended press nips (27, 37) disposed one behind the other, which are each formed by a press roll (21, 31) and by a flexible rotating press member (28) which can be pressed against the press rolls by means of a press shoe (27, 37). The paper web which is to be dewatered passes through the first extended press nip between two endless felt belts (11, 13).
In accordance with the invention, the paper web runs through the second extended press nip together with only one (11 or 13) of the two felt belts. As a result the paper web (9) comes into contact with the smooth outer surface of the second press roll. Because of this arrangement the flexible press member can have a rough outer surface formed, for example, by the joggles of a reinforcing fabric.

REFERENCES:
patent: 4188262 (1980-02-01), Kankaanpaa
patent: 4201624 (1980-05-01), Mohr et al.
patent: 4483745 (1984-11-01), Wicks et al.
patent: 4586984 (1986-05-01), Laapotti
patent: 4625376 (1986-12-01), Schiel et al.
patent: 4643802 (1987-02-01), Schiel
patent: 4661206 (1987-04-01), Heitmann et al.
patent: 4691420 (1987-09-01), Schiel et al.
patent: 4704192 (1987-11-01), Cronin
patent: 4704776 (1987-11-01), Watanabe et al.
patent: 4923570 (1990-05-01), Steiner

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