Press section in a paper machine

Details Press section in a paper machine Press section in a paper machine

1981-07-27

1984-04-03

Alvo, Steve

Paper making and fiber liberation

Apparatus

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

162359, 162360, D21F 304, D21F 308

Patent

active

044405987

ABSTRACT:
A press section in a paper machine includes a first double felted press nip defined by first and second rolls through which first upper and second lower felt fabrics pass and at least two single felted press nips defined with a plain surface roll, the first felt fabric passing through a first one of the single felted press nips. The press section includes only non-suction rolls, the first and second rolls defining the first double felted press nip each having a solid shell and recessed surface. The first felt fabric supports the web leaving the wire section and is guided over a first sector of the first recessed surface roll wherein the direction thereof is changed so as to be directed generally upwardly prior to the first double felted press nip. The second lower felt fabric which passes through the first double felted press nip is guided over a second sector of the first recessed surface roll which comprises at least a substantial portion of the first sector thereof to provide external support for the web. The second felt fabric is separated from the web substantially immediately after the first double felted press nip whereupon the first felt fabric and web supported thereby is conducted to and passes through the first single felted press nip, the web then detaching from the first felt fabric and adhering to the surface of the plain surface roll for subsequent passage through the second single felted press nip.

REFERENCES:
patent: 4056433 (1977-11-01), Koponen et al.
patent: 4163688 (1979-08-01), Kankaanpaa
patent: 4192711 (1980-03-01), Tapio et al.
patent: 4209361 (1980-06-01), Kankaanpaa
patent: 4224104 (1980-09-01), Kankaanpaa
patent: 4257844 (1981-03-01), Schmitt et al.

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