Paper making and fiber liberation – Apparatus – Running or indefinite length product forming and/or treating...
Patent
1988-10-20
1989-10-17
Hastings, Karen
Paper making and fiber liberation
Apparatus
Running or indefinite length product forming and/or treating...
68181R, 162 60, 162311, 210400, 210401, D21C 902
Patent
active
048744689
ABSTRACT:
The invention relates to an apparatus or plant or arrangement for the treatment of a dilute suspension of fibers or layer of material passed between two endless foraminous belts or wires or the like conveying means, the forming fibrous board being made to pass between the foraminous belts along at least one container for a treatment medium and at least some of the treatment containers being provided with a wall having orifices on the side facing the fibrous board for generating a pressure difference on the same, but being otherwise closed against the environment, and/or at least some of the treatment containers closed against the environment having walls closed against the foraminous belts and thus against the fibrous board, but otherwise open towards the foraminous belts. According to the invention, a reduction of the energy requirement in the displacement washing of filter cakes is sought above all. This is achieved according to the invention in that in particular for countercurrent treatment, conveniently for countercurrent displacement washing, at least one treatment container arranged above the upper framinous belt, in particular in contact with said belt, is formed as a pressure container from which the treatment liquid is dispensed under superpressure to the foraminous belts or to the forming fibrous board or layer of material present therebetween, and further by providing for a pressureless collecting container or pressureless collecting containers to be provided opposite this or these pressure container(s) underneath the lower foraminous belt.
REFERENCES:
patent: 2356285 (1944-08-01), Street
patent: 2881676 (1959-04-01), Thomas
patent: 3938206 (1976-02-01), Stranger-Johannesson
patent: 4292123 (1981-09-01), Linturen et al.
patent: 4481118 (1984-11-01), Heissenberger et al.
patent: 4549415 (1985-10-01), Justus
patent: 4664749 (1987-05-01), Hoopamaki et al.
Petschauer Franz
Sbaschnigg Johann
Hastings Karen
Maschinenfabrik Andritz Actiengesellschaft
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