Cold runner system for sandwich molding
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United States of America Patent
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-
Nov 30, 2004
Grant Date -
Dec 25, 2003
app pub date -
Jun 24, 2002
filing date -
Jun 24, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of sandwich molding, in which a first thermoplastic material is injected into a mold cavity followed by the injection of a second thermoplastic material expanding within the first thermoplastic material, eliminates the need for heated runner systems communicating from the injection nozzle of the injection molding machine to the mold cavity by employing a cold runner having sufficiently slow solidification time to allow subsequent injections from two injection sources. The backflow into the inactive branch is prevented by maintaining the injection nozzle against the mold until molding is complete.
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