Paper making and fiber liberation – Apparatus – Running or indefinite length product forming and/or treating...
Patent
1989-05-02
1990-04-17
Hastings, Karen M.
Paper making and fiber liberation
Apparatus
Running or indefinite length product forming and/or treating...
100153, 162205, 162361, D21F 302
Patent
active
049177672
ABSTRACT:
A press with extended nip for paper and board machines includes a support element acting as counter member; a pressure element disposed opposite the support element, designed to be secured to a stand, and including a press shoe which, together with the support element, forms a pressing zone with extended nip; at least one endless movable fluid-impervious belt, being arranged to pass through the pressing zone in sliding contact with the press shoe; and at least one endless liquid-absorbing felt, arranged to pass through the pressing zone together with a fiber web to be dewatered. The pressure element includes an elongate jack unit disposed transversely across the belt and including a plurality of jacks disposed in at least one row across the belt and acting on the press shoe to force it against the support element, a block with cavities for the pistons of the jacks, and a top element closing the cavities and being provided with apertures for the piston rods of the jacks, the piston rods acting on the press shoe.
REFERENCES:
patent: Re30268 (1980-05-01), Justus
patent: 3853698 (1974-12-01), Mohr
patent: 4272317 (1981-06-01), Roerig
patent: 4556454 (1985-12-01), Dahl et al.
patent: 4563245 (1986-01-01), Wanke et al.
patent: 4568423 (1986-02-01), Laapotti
patent: 4705602 (1987-11-01), Dahl
patent: 4713147 (1987-12-01), Saarinen
Ilmarinen Antti I.
Jansson Kjell S. E.
Hastings Karen M.
Valmet Paper Machinery Inc.
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