Method and device for the continuous polycondensation of polyester material in the solid phase
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United States of America Patent
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Feb 8, 2011
Grant Date -
Sep 30, 2004
app pub date -
Feb 26, 2001
filing date -
Feb 26, 2001
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Abstract
The invention relates to a method and device for the continuous polycondensation of polyester material in the solid phase, in particular in the form of partially crystalline granulate. The aim of the invention is to achieve a high product throughput on recrystallising and recondensation of polyester material with a low initial IV. Said aim is achieved, whereby on recrystallisation, a low residence time of 1-10 minutes is achieved, by means of a rapid heating of a thin product layer, followed by an SSP treatment.
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