Classifying – separating – and assorting solids – Precedent preparation of items or materials to facilitate... – Selective differentiation
Patent
1975-03-14
1979-01-02
Sever, Frank
Classifying, separating, and assorting solids
Precedent preparation of items or materials to facilitate...
Selective differentiation
209167, B03B 100
Patent
active
041326334
ABSTRACT:
A method for separating a mixture of plastics of at least two components selected from the group consisting of polyethylene, polypropylene and a polystyrene, which comprises placing the mixture of plastics in a separation cell containing an aqueous liquid medium containing at least one wetting agent, and introducing gas bubbles into the cell thereby to cause the gas bubbles to selectively adhere to the surface of the polypropylene and/or polyethylene and float the polypropylene and/or polyethylene when the mixture of plastics comprises a polystyrene and polypropylene and/or polyethylene or to selectively adhere to the surface of the polypropylene and float the polypropylene when the mixture of plastics comprises polypropylene and polyethylene with the polypropylene and/or the polyethylene being recovered as a float and the polystyrene being recovered as a residue when the mixture of plastics comprises a polystyrene and polypropylene and/or polyethylene, and with the polypropylene being recovered as a float and the polyethylene being recovered as a residue when the mixture of plastics comprises polypropylene and polyethylene.
REFERENCES:
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patent: 3074653 (1963-01-01), Schorsch
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Chem. Abstracts, vol. 79, 1973, 34881j.
Modern Packaging Encyclopedia Issue, vol. 41, No. 74, Jul. 1968, pp. 164 and 165.
Izumi Sumio
Saitoh Kozo
Mitsui Mining & Smelting Co. Ltd.
Sever Frank
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