Process for producing polyester composition
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United States of America Patent
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Nov 10, 1998
Grant Date -
N/A
app pub date -
Aug 29, 1997
filing date -
Aug 30, 1996
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Abstract
The present invention relates to a process for producing a polyester sheet comprising melt-extruding a polyester resin by using a vent-type twin-screw extruder in sheet-wise onto the surface of a rotating chilling drum under the condition satisfying the following formula (1): 5.2.times.10.sup.-6 .times.D.sup.2.8 .ltoreq.Q/N.ltoreq.15.8.times.10.sup.-6 .times.D.sup.2.8 (1) wherein D mm represents the inner diameter of the extruder cylinder, Q kg/hr represents the extrusion rate per unit time and N rpm represents the screw number of revolution.
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