Press section with separate press nips in a paper machine

Details Press section with separate press nips in a paper machine Press section with separate press nips in a paper machine

1983-09-12

1985-07-02

Smith, William

Paper making and fiber liberation

Apparatus

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

162305, 162359, D21F 304

Patent

active

045266557

ABSTRACT:
A press section of a paper machine comprises, in the direction of web run, at least three separate press nips for removing water from a web, the web passing between two fabrics in each of the three nips. Dewatering of the web takes place through both faces of the web at least in the first press nip which is formed between two open-faced press rolls. The second and third press nips are formed between an open-faced roll and one of an open-faced roll and a smooth-faced roll. According to the invention, the press section includes two upper fabrics and two lower fabrics, the first upper and lower fabrics in the direction of web run being water-receiving press fabrics, one of which constitutes a press fabric only in the first press nip, the other fabric constituting a press fabric both in the first and second press nips. One of the second upper and lower fabrics is a water-receiving press fabric, the other being a water-non-receiving transfer fabric adapted to receive minimal amounts of water, if any. The web is transferred on the transfer fabric after the third press nip as a closed draw into the drying section which follows the press section.

REFERENCES:
patent: 3215592 (1965-11-01), Justus et al.
patent: 3268390 (1966-08-01), Ely, Sr.
patent: 3293121 (1966-12-01), Martin
patent: 4201624 (1980-05-01), Mohr et al.
patent: 4219383 (1980-08-01), Valkama
patent: 4483745 (1984-11-01), Wicks et al.

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