Paper making and fiber liberation – Apparatus – Running or indefinite length product forming and/or treating...
Patent
1983-02-28
1985-06-25
Alvo, Steve
Paper making and fiber liberation
Apparatus
Running or indefinite length product forming and/or treating...
162305, 162306, 162358, 1623601, D21F 304, D21F 900, D21F 902
Patent
active
045252416
ABSTRACT:
A closed press section of a paper machine in which a paper web leaving the wire section of the paper machine is passed, supported by a first upper fabric, through a first double-felted press nip formed by two hollow-faced rolls. The lower fabric in the first double-felted press nip is a second fabric which carries the web forwardly after the first press nip. The press section further includes a smooth-faced central roll against which at least two single-felt nips are formed, the press fabric in the first one of the single-felt nips being constituted by the second fabric. The web is detached from the second fabric and adheres to the face of the smooth-faced central roll and moves along therewith into the next single-felt nip. The press section is devoid of press rolls of the suction type with the first double-felted press nip being formed between two solid-mantle hollow-faced rolls. The run of the lower fabric and web carried thereby is turned downwardly prior to the first single-felt press nip guided by a sector of a roll having a magnitude in the range of about 30.degree. to 160.degree.. The web is passed through the first double-felted press nip and the at least two single-felt nips so that the face of the web which did not contact the forming wire contacts the smooth face of the central roll of the press in the second and third press nips.
REFERENCES:
patent: 4075056 (1978-02-01), Ely et al.
patent: 4192711 (1980-03-01), Tapio et al.
patent: 4257844 (1981-03-01), Schmitt et al.
Alvo Steve
Valmet Oy
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