Polystyrene recycling process

Details Polystyrene recycling process Polystyrene recycling process

1990-08-03

1991-10-29

Rosenbaum, Mark

Solid material comminution or disintegration

Processes

With application of fluid or lubricant material

241 21, 241 23, 241 24, 241 29, 241 4617, 241 78, 241 791, 241152A, 241DIG38, B02C 2338

Patent

active

050608703

ABSTRACT:
The invention comprises a method and apparatus for recycling foamed polystyrene from municipal solid waste and more particularly, from fast food restaurant waste. A steady stream of waste is delivered to a flail mill for reducing particle size, a rotary trommel for eliminating undersized waste and a rotary air classifier for removing "heavy" waste from the stream. At this point, the waste stream comprises mostly paper and foamed polystyrene. The paper and foamed polystyrene are delivered to a water pulper which fiberizes the paper so that it can then be separated from the foamed polystyrene by passing it through a screen of selected mesh size to allow the water and paper pulp to pass through while retaining the foamed polystyrene.

REFERENCES:
patent: 3848813 (1974-11-01), Stanczyk et al.
patent: 4153207 (1979-05-01), Cerroni
patent: 4844351 (1989-07-01), Holloway
patent: 4894148 (1990-01-01), Frei
WTE Corporation, Confidential Progress Report-Amoco-McDonald's Project, Mar. 15, 1988, pp. 1-26.

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