Press section without press suction rollers in a paper machine

Details Press section without press suction rollers in a paper machine Press section without press suction rollers in a paper machine

1983-08-17

1985-11-05

Smith, William F.

Paper making and fiber liberation

Apparatus

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

162305, 162306, 162359, D21F 304, D21F 308

Patent

active

045512051

ABSTRACT:
A press section of a paper machine has no suction rollers. The paper web is first conducted through a first two-fabric press nip supported by a first fabric which, in conjunction with a pick-up roller, serves as a pick-up fabric. The press section has press rollers in closed roller combination defining press nips with each other. A first two of the press rollers are provided with solid recessed surfaces. A third of the press rollers is a smooth-surface central roller of the press section. The second fabric serves as a press fabric at least in the first two-fabric press nip. The web is conducted through the first press nip defined by the first and second press rollers interposed between the first and second fabrics. The web is conducted through a second press nip supported by the first or second fabric. The second press nip is defined between the second press roller and the third press roller. The web is conducted between the first and second press nips, separate from the second press roller, over a return roller. Devices are provided in conjunction with the return roller to maintain the web in contact with the fabric supporting it on the sector of the return roller which is lapped by the first and second fabrics or the web supported thereby.

REFERENCES:
patent: 3185617 (1965-05-01), Justus
patent: 4056433 (1977-11-01), Koponen
patent: 4163688 (1979-08-01), Kankaanpaa
patent: 4192711 (1980-03-01), Topio et al.
patent: 4209361 (1980-06-01), Kankaanpaa
patent: 4257844 (1981-03-01), Schmitt et al.
patent: 4440598 (1984-04-01), Koski et al.

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