Method and device for the reprocessing of a thermoplastic polycondensate
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United States of America Patent
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Jun 3, 2008
Grant Date -
Apr 15, 2004
app pub date -
Oct 30, 2003
filing date -
Nov 26, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Method and device for reprocessing a thermoplastic polycondensate, in particular for the recycling of thermoplastic polycondensates, such as polyethylene terephthalate, polyester or polyamide is provided. The polycondensate is introduced into an extruder in a solid state. The polycondensate is then heated to a temperature below melting temperature and degassed or dried at below atmospheric pressure or with an inert gas added. Preferably, to prevent the polycondensate flakes from escaping through a degassing opening, a conveying device is used to convey the escaping flakes back into the extruder. The dried flakes are then melted.
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