Method and apparatus for forming a multi-layer preform
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United States of America Patent
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-
Nov 18, 1997
Grant Date -
N/A
app pub date -
Oct 13, 1995
filing date -
Oct 13, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A preform mold assembly for the injection molding of a multi-layer preform for use in the blow molding of container. The preform mold assembly comprises a preform mold having a gate for receiving molten plastic material. The preform mold has a cavity with longitudinal axis and defines an inner surface. A core-pin is situated within the cavity and spaced from said inner surface. A preform cavity is formed between the inner surface of the cavity and the core-pin for receiving molten plastic from the gate. A threadsplit portion is situated within the cavity at a location remote from said gate. The inner surface of the cavity defines a plurality of flutes formed generally parallel to the cavity longitudinal axis and extend longitudinally along the inner surface of the mold to the threadsplit portion.
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