Apparatus for measuring and of controlling the gap between polymer sheet cooling rolls
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United States of America Patent
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Jun 18, 2002
Grant Date -
Apr 11, 2002
app pub date -
Oct 21, 1999
filing date -
Oct 21, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An apparatus for heating and extruding a polymeric sheet having a predetermined thickness and introducing it into and through a gap between cooling rolls, measuring directly by laser beam and without reflection the gap between the cooling rolls, and controlling the gap to control minimal pressure on the softened and heat-plastified sheet.
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