Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With washing
Patent
1992-06-11
1996-01-09
Lamb, Brenda Adele
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With washing
162 56, 162297, 210406, 210400, D21C 902
Patent
active
054825946
ABSTRACT:
A pulp dewatering and washing apparatus comprising a pressure vessel in which is contained a table assembly having a foraminous surface, in the form of a conveying belt, on which a pulp slurry is deposited. A differential pressure chamber in the table assembly is vented to a lower pressure location to cause a pressure differential across the pulp slurry to cause dewatering. Also, wash water is deposited on the dewatered pulp in sequential cycles to accomplish washing. A contact plate is provided to press the pulp slurry to aid in dewatering. The conveying belt of the table assembly on which the pulp slurry is deposited is stationary during the dewatering and washing, and then after the pressure differential between the vessel and the pressure differential chamber is reduced to zero, the conveyor belt moves the dewatered and washed slurry to a discharge location.
REFERENCES:
patent: 3922298 (1976-11-01), Davis
patent: 3970552 (1976-07-01), Bongert
patent: 4154644 (1979-05-01), Ericsson
patent: 4233157 (1980-11-01), Miller
patent: 4477358 (1984-10-01), Heintges et al.
patent: 4956088 (1990-09-01), Hindstrom
patent: 5209841 (1993-05-01), Bratten
Hughes Robert B.
Lamb Brenda Adele
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