Classifying – separating – and assorting solids – Special applications
Patent
1989-07-10
1992-01-28
Hajec, Donald T.
Classifying, separating, and assorting solids
Special applications
162380, 209 12, 209 17, 209211, B03B 700, B01D 1900
Patent
active
050841610
ABSTRACT:
A method and apparatus for the removal of light material from a fiber suspension particularly suitable for removing light compressible plastic material such as expanded polystyrene and similar material from the short circulation of a paper machine. The plastic particles containing fiber suspension is divided in a degassing tank into reject and accept flows by the assistance of vacuum. The light reject containing flow is separated from the main flow by an overflow device and recirculated to the wire pit or corresponding device. A separation device such as a vibrating screen, vibrating drum, curved screen or inverted cyclone is provided within the light reject flow return duct for removing the detrimental plastic or other light material from the short circulation and for preventing the accumulation thereof in the wire pit.
REFERENCES:
patent: 3206917 (1965-09-01), Kaiser et al.
patent: 3279597 (1966-10-01), Reinhall
patent: 3421622 (1969-01-01), Wurtmann
patent: 3812007 (1974-05-01), Kaiser
patent: 4146469 (1979-03-01), Kaiser et al.
patent: 4238208 (1980-12-01), Frykhult et al.
A. Ahlstrom Corporation
Hajec Donald T.
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