Press section of a paper machine

Details Press section of a paper machine Press section of a paper machine

1995-01-27

1997-01-14

Hastings, Karen M.

Paper making and fiber liberation

Apparatus

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

1623583, 1623602, D21F 304

Patent

active

055935478

ABSTRACT:
Various embodiments of a press section for a paper making machine are disclosed having a first press section with two press nips defined by press rolls pressing against a first central roll followed by a second press section with two press nips defined by press rolls pressing against a second central roll. The first central roll is wrapped by a first felt which carries the web through the first and second press nips. The second central roll is unfelted. At least a single respective felt passes through each of the four press nips, and in some embodiments two felts pass through some of those press nips. At least one of the third and fourth press nips is defined by a long nip shoe press in the respective press roll. An additional press nip may be defined around either of the last press roll of the first press section or the first press section, and that additional press nip is double felted. The transfer between the first and second press sections may be an open transfer from the second press roll of the first section or it may be a supported transfer by the felt passing through the second press nip carrying the web into the third press nip.

REFERENCES:
patent: 2882968 (1959-04-01), Beachler
patent: 4197158 (1980-04-01), Johnson
patent: 4483745 (1984-11-01), Wicks et al.
patent: 4648942 (1987-03-01), Wanke et al.
patent: 5092962 (1992-03-01), Koski
Das Papier 891H10A--Aug. 1989: P. Mirsberger, Schuhpressen zum intensiven Entwassern von Papier und Karton, pp. 130-138.
J. M. Voith GmbH; Technical data sheet; Baujahr 1971.

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