Recycling process and apparatus for the production of polymer from thermoplastic polycondensate
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United States of America Patent
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-
May 3, 1994
Grant Date -
N/A
app pub date -
Feb 9, 1993
filing date -
Mar 13, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process and apparatus for the production of a polymer of thermoplastic polycondensate in which the polymer is first treated in a screw extruder and then in a mixing tank. In the extruder the polycondensate is heated in a first zone to a temperature below its melting point and thereafter it is heated to a temperature above its melting point at a vacuum. Water and other volatile components are removed from the first and second zones of the extruder. In the mixing tank the polymer is maintained under vacuum conditions and is conveyed and mixed by spiral mixing blades to remove residual water and volatile components. The polymer is discharged at the bottom of the mixing tank by a melt pump after a residence time of between 5 and 60 minutes in the mixing tank.
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