Closed and compact press section of a paper machine with double

Details Closed and compact press section of a paper machine with double Closed and compact press section of a paper machine with double

1987-09-11

1988-12-20

Lacey, David L.

Paper making and fiber liberation

Apparatus

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

162305, 162306, D21F 304

Patent

active

047923814

ABSTRACT:
A closed press section of a paper machine for removing water from the paper web passing therethrough. A compact press roll combination is provided with several press nips being formed in association with various rolls, and between which the web runs supported by roll surfaces without substantially long free draws. The press section comprises a first nip formed by two press suction rolls, through which two felts pass, the first felt functioning as a pick-up felt and moving the web from a pick-up point through the first press nip, and the second felt moving the web from the first nip to the second press nip of the press section. The second press nip is formed at a lower circumference of a smooth-surfaced, large diameter center roll, through which the second felt runs. Another smooth-surfaced, large diameter center roll is mounted in bearings and has a circumference located a short distance from the circumference of the first center roll, with a third press nip being formed at an upper circumference of the second center roll, and through which another press felt is guided. The web is detached from the smooth surface of the second center roll after the third press nip and is conveyed to the drying section of the paper machine. The paper web is essentially conveyed along a path shaped like an S or a mirror image thereof around the two center rolls, so that both sides of the web are pressed against a smooth surface of a respective center roll.

REFERENCES:
patent: 3861996 (1975-01-01), Dorfel
patent: 4075056 (1978-02-01), Ely et al.
patent: 4086131 (1978-04-01), Rempel et al.
patent: 4188262 (1980-02-01), Kankaanpaa
patent: 4209361 (1980-06-01), Kankaanpaa
patent: 4252241 (1985-06-01), Laapotti
patent: 4556451 (1985-12-01), Ely
patent: 4704192 (1987-11-01), Cronin

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