Classifying – separating – and assorting solids – Precedent preparation of items or materials to facilitate... – Selective differentiation
Patent
1977-06-27
1979-07-10
Hill, Ralph J.
Classifying, separating, and assorting solids
Precedent preparation of items or materials to facilitate...
Selective differentiation
209138, 209 36, 162 4, 241 20, B03B 100, B07B 402
Patent
active
041607228
ABSTRACT:
The plastic discarded in municipal solid waste is recovered by a process wherein the waste is reduced to a particulate mass having a liquid content of 20% or more such that the paper and other absorbent constituents retain sufficient liquid to be substantially heavier than the sheet plastic pieces of comparable size. The mass is then subjected to an air separation treatment wherein the plastic pieces are blown free of the paper and other constituents of the mass. In one form, the solid waste is first pulped in water to slurry form, some of the fiber is recovered from the slurry by screening, and the reject flow from the screen is dewatered and subjected to the air separation treatment. In another form, the solid waste is dry shredded and the high specific gravity materials removed prior to pulping. In still another form, the dry material is wetted sufficiently for effective air separation of the plastic.
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Boettcher; R. A., "Air Classification for Reclamation Processing of Solid Wastes," ASME Paper 69-WA/PID-9, 1969.
Black Clawson Fibreclaim Inc.
Hill Ralph J.
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