Paper making and fiber liberation – Apparatus – Running or indefinite length product forming and/or treating...
Patent
1988-06-17
1990-04-24
Hastings, Karen M.
Paper making and fiber liberation
Apparatus
Running or indefinite length product forming and/or treating...
162273, 162305, 162359, D21F 304
Patent
active
049197622
ABSTRACT:
A press section of a paper machine includes a first upper fabric, a pick-up suction roll within a loop of the first upper fabric for transferring a web from the forming wire of the paper machine onto the first upper fabric, a first lower fabric, a lower first press roll within a loop of the first lower fabric forming a first double-felted nip with the pick-up suction roll, a smooth-surfaced center roll, a second press roll situated within the loop of the first upper fabric forming a second single-felted nip with the center roll through which the first upper fabric passes, and wherein the first upper fabric has a substantially straight run between the first double-felted nip and the second single-felted nip. The press section frame construction includes a front and a rear frame which are not directly connected to each other defining an at least partly open space between them through which most of the press rolls can be replaced, the pick-up suction roll and lower first press roll being mounted on the front frame, the second press roll being mounted on the front frame, and the center roll being supported by a stationary frame part.
REFERENCES:
patent: 2415351 (1947-02-01), Hornbostel
patent: 3861996 (1975-01-01), Dorfel
patent: 4075056 (1978-02-01), Ely et al.
patent: 4188262 (1980-02-01), Kankaanpaa
patent: 4525241 (1985-06-01), Laapotti
patent: 4608125 (1986-08-01), Autio
patent: 4657634 (1987-04-01), Autio
patent: 4704192 (1987-11-01), Cronin
Locke "Felts are Key Factor in Performance of Vacuum Pick Up" Paper Trade Journal, Aug. 1966.
Laapotti Jorma
Tapio Olli
Hastings Karen M.
Valmet Paper Machinery Inc.
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