Press section with separate press zones in a paper machine
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United States of America Patent
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-
Dec 11, 1990
Issued Date -
N/A
app pub date -
Oct 26, 1989
filing date -
May 25, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A press section in a paper machine includes, in the direction of web run, two successive, separate press nips for dewatering a web, the web passing between the nips in a closed draw. The first nip is formed between two, preferably hollow-faced, press rolls. The press section includes a first fabric which picks up the web from the forming wire. The press section comprises at least three fabrics of which one acts as a press fabric in the first press nip and another acts as a press fabric and/or as a transfer fabric both in the first as well as in the second nip. The web is transferred from the last press nip of the press section to the drying section. The last press nip is formed by an extended-nip press and has a nip zone with a length substantially longer than the length of the press zone of the preceding roll nip. The web runs through the nip zone of the extended-nip press so that it is supported on one side by a substantially non-water receiving transfer fabric, the other side of the web being pressed by a water-receiving press fabric. The web is substantially immediately detached from the water-receiving press fabric after passing through the extended nip zone and is passed to the drying section.
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