Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Shaping against forming surface
Patent
1991-12-13
1993-08-17
Theisen, Mary Lynn
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
Shaping against forming surface
264112, 264126, 264DIG69, B29C 4302
Patent
active
052366553
ABSTRACT:
The present invention relates to a process and a device for processing plastic waste, such as packaging foil of polyvinylchloride, polyethylene, polypropylene etc. into blocks by compressing it in a container. The processing of the plastic waste is achieved by compressing with a punch at a temperature of 120.degree.-180.degree. C. and a pressure of 250-400 g/cm.sup.2 and preferably at a temperature of 140.degree.-160.degree. C. and a pressure of 260-290 g/cm.sup.2, followed by cooling with air. The cooling is carried out by the introduction of air in the container by a fan, which cooling takes place in 5-15 minutes, and preferably 8-10 minutes. The device of the invention is provided with a punch, whereas the inner surfaces of said container and/or said punch are provided with a coating in order to prevent said softened and compressed plastic waste from adhering to the walls. The coating is preferably teflon, whereas the heating elements advantageously are electrical heating elements.
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patent: 4997609 (1991-05-01), Neefe
PWR Recycling B.V.
Theisen Mary Lynn
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