Plastic and nonmetallic article shaping or treating: processes – Recycling of reclaimed or purified process material – Of gaseous process material
Patent
1991-07-01
1993-06-08
Kuhns, Allan R.
Plastic and nonmetallic article shaping or treating: processes
Recycling of reclaimed or purified process material
Of gaseous process material
264 454, 264 53, 264126, 264DIG69, B29C 6722
Patent
active
052176606
ABSTRACT:
A method for recycling expanded polystyrene foam materials. Unexpanded virgin polystyrene beads having pentane gas contained therein are thermally expanded to produce a supply of expanded beads. Next, a supply of used expanded polystyrene foam is obtained and ground into small portions, preferably of the same size as the expanded beads. The used polystyrene foam pieces are then placed in contact with pentane gas. The expanded beads and the pentane-treated foam pieces are thereafter combined to form a mixture which preferably contains not less than about 50% by weight foam pieces. The mixture is then placed in a mold, followed by the application of heat and pressure thereto in order to produce a final product with a high degree of structural integrity. The pentane gas treatment of the foam pieces enables the fusion thereof to the expanded beads, resulting in a highly durable product.
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Hewlett--Packard Company
Kuhns Allan R.
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