Secondary vacuum box for a rotary vacuum filter

Details Secondary vacuum box for a rotary vacuum filter Secondary vacuum box for a rotary vacuum filter

1977-01-03

1978-10-24

Fisher, Richard V.

Paper making and fiber liberation

Apparatus

Running or indefinite length product forming and/or treating...

162297, 162323, 162364, 210217, 210402, D21F 148

Patent

active

041219686

ABSTRACT:
An apparatus for improving the dewatering capability of a rotary drum vacuum filter or washer is described in which a suction box, independently supported above the filter drum, having an apertured outermost surface, and a vacuum means operating upon the box, is combined with a foraminous belt, tensioned to contact the suction box apertured surface and that portion of the drum surface not adjacent the box such that rotation of the drum causes the belt to rotate with the drum, sliding over the suction box. In operation, a cake or fibrous web that is formed upon the belt while it is in contact with the filter drum surface, partially submerged in a slurry of the material to be recovered, is subsequently subjected to the suction box vacuum means as the belt-supported web passes over the apertured surface. A discharge box at the trailing edge of the suction box is supplied with pressurized air to blow the cake or fibrous web from the foraminous belt surface at the product discharge point. A steam hood for use in conjunction with the dewatering apparatus is described.

REFERENCES:
patent: 1163251 (1915-12-01), Millspaugh
patent: 2036168 (1936-03-01), Engert et al.
patent: 2714839 (1955-08-01), Mazer
patent: 2843025 (1958-07-01), Holden
patent: 2990013 (1961-06-01), Rance et al.
patent: 3057402 (1962-10-01), Webster
Simons et al., "Steam Dewatering of Filter Cakes", Chemical Engineering Progress, Vol. 62, No. 1, pp. 75-81, Jan. 1966.

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