Injection molding apparatus having a melt bore through the front end of the pin
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United States of America Patent
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Aug 7, 2001
Issued Date -
N/A
app pub date -
Dec 18, 1998
filing date -
Oct 23, 1997
priority date (Note) -
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Abstract
Multi-cavity injection molding apparatus for three layer molding having elongated pins for fixed pin gating or valve gating. Each elongated pin has a central melt bore extending rearwardly from its front end to a number of laterally extending bores. A low viscosity barrier material such as EVOH or nylon flows through these bores to the gate leading to the cavity. This allows coinjection with fixed pins and sprue gating in one embodiment and by valve gating in another embodiment.
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