Recycling of contaminated plastic

Details Recycling of contaminated plastic Recycling of contaminated plastic

1981-05-29

1985-01-15

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

With step of cooling to a temperature of zero degrees c. or...

241 23, 264102, 264140, 264DIG69, B02C 1900, B02C 2300, B29B 300

Patent

active

044938063

ABSTRACT:
A process is provided for recycling contaminated plastic to achieve a product having improved softness and enchanced stability. The process includes the step of chilling the material being recycled to an embrittlement temperature and pulverizing the chilled material to a finely divided consistency. The process is suitable for use in recycling polyvinyl chloride (PVC) having a range of acceptable contaminants such as laminations, adhesives, coatings including a polyester film of Mylar (polyethylene teraphthalate) in plain or metalized form, which would normally require physical removal of the contaminants to prevent contamination of the reprocessed plastic, that usually results in a black material of very limited utility. In practicing the improved process the contaminants are dispersed through the pulverized material resulting in plastic which may be influenced by color and upon re-use, as by pelletizing or melting and extruding by way of a screw feeder, results in a naturally foaming material having closed cell foam characteristics which provide a good finish, improved softness and stability against shrinkage, enhanced resistance to delamination, and no retained "memory".

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patent: 4304873 (1981-12-01), Klein
Fisher, E. G., Extrusion of Plastics, New York, Interscience Publishers, .COPYRGT.1958, pp. 80 and 81.
Flathers, N. T., R. E. Johnson, V. R. Pallas and W. Mayo Smith, "Advances in Dry Blend Extrusion" in Modern Plastics, May 1961, pp. 210, 212, 219, 220, and 346.

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