Vacuum washer drum

Details Vacuum washer drum Vacuum washer drum

2007-12-10

2009-08-18

Halpern, Mark (Department: 1791)

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With washing

C162S272000, C162S199000, C134S119000, C134S021000, C210S402000, C210S404000

Reexamination Certificate

active

07575658

ABSTRACT:
A vacuum drum washer is designed to enable the use of an end-draining drum for drum lengths exceeding 20 feet. The drum washer includes a cylindrical drum having a mesh screen defining an exterior wall. A plurality of outer filtrate channels are disposed radially inward from the mesh screen. A plurality of inner filtrate channels are disposed radially inward from the outer filtrate channels and extend along generally less than an entire length of the drum. A transfer channel connects the outer filtrate channels and the inner filtrate channels. A plurality of radial drainage chutes are disposed adjacent a head end of the outer and inner filtrate channels, which direct the filtrate to a drain valve.

REFERENCES:
patent: 3225935 (1965-12-01), Porteous
patent: 3363774 (1968-01-01), Luthi
patent: 3947361 (1976-03-01), Jackson
patent: 5021126 (1991-06-01), Gwin et al.
patent: 5308488 (1994-05-01), Nelson
patent: 5480545 (1996-01-01), Lewis

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