Paper making and fiber liberation – Apparatus – Running or indefinite length product forming and/or treating...
Patent
1990-11-28
1991-07-23
Hastings, Karen M.
Paper making and fiber liberation
Apparatus
Running or indefinite length product forming and/or treating...
162358, 162363, 162374, D21F 200, D21F 148
Patent
active
050341006
ABSTRACT:
A stationary drainage device for a papermaking machine is described including a drainage box which may have a plurality of vacuum chambers and a stationary curved cover formed by cover strips of ceramic material separated by drainage slots. The cover includes a central cover strip of greater width than the other cover strips on opposite sides thereof. A pressure roll presses the paper sheet and the porous conveyor transporting such sheet across the curved cover of the drainage device, against the curved upper surface of the central cover strip at a nip position spaced from the drainage slots and the other cover strips for greater dewatering efficiency. The stationary drainage device may be mounted at the output of the forming section as a stationary couch device or in the press section as a felt conveyor cleaning and dewatering device.
REFERENCES:
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patent: 3556936 (1971-01-01), Miyamoto
patent: 3824152 (1974-07-01), Nevalainen
patent: 4270978 (1981-06-01), Fioravanti
patent: 4406739 (1983-09-01), Kankaanpaa
patent: 4443300 (1984-04-01), Bubik et al.
patent: 4880500 (1989-11-01), Eldridge et al.
patent: 4919760 (1990-04-01), Kerttula
Hastings Karen M.
Wilbanks International
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