Injection molding valve member sealing bushing with a thin collar portion
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United States of America Patent
Stats
-
Feb 7, 1995
Grant Date -
N/A
app pub date -
Mar 7, 1994
filing date -
Feb 14, 1994
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Valve gated injection molding apparatus wherein the reciprocating valve member extends into the melt passage through a sealing bushing. The sealing bushing has a thin steel collar portion which extends forwardly into the melt passage and fits around the valve member to form a seal against leakage of melt rearwardly along the valve member. In the preferred embodiments, the collar portion is thin enough that it is slightly compressed around the valve member by the pressure of the surrounding melt in the melt passage to improve the seal.
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