Double-webbed mandrel
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United States of America Patent
Stats
-
Feb 12, 2008
Grant Date -
Jun 24, 2004
app pub date -
Oct 3, 2003
filing date -
Feb 13, 2002
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An mandrel for extrusion of hollow bodies, such as, polyvinyl chloride (PVC) hard, compact, and foamed pipes, includes an inner collar, an outer collar, and a middle collar, each of the collars being radially joined by webs to the particular adjoining collar. Each interior web and exterior web, relative to the middle collar, can form a web pair, the webs of the web pair being arranged to overlap at least partially in the radial direction in a particular embodiment.
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