Methods for forming tubing utilizing suction and pneumatic pressure at the surface of the cooling plug
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United States of America Patent
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Mar 22, 1994
Issued Date -
N/A
app pub date -
Sep 10, 1992
filing date -
Jan 14, 1992
priority date (Note) -
In Force
status (Latency Note)
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Abstract
The invention concerns a cooling plug for sizing the interior surface of thermoplastic extruded pipe. Vacuum and/or pneumatic pressure is applied at the surface of the plug. The pneumatic pressure may cause the inner wall to balloon outwardly to form bells within a mold or within an outer wall, to fit into corrugations of an outer corrugated tube, etc. The vacuum may be used to pull the inner wall back to the surface of the plug after application of pneumatic pressure.
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