Injection molding of thermoplastics in sandwich mold employing desynchronized opening, extended and closing periods
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United States of America Patent
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-
Aug 23, 1983
Issued Date -
N/A
app pub date -
Jun 19, 1981
filing date -
Oct 14, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method of injection molding a thermoplastic material to produce a product in a sandwich mold comprising at least two ejection ports each having a cooling cavity, and a single runner system for feeding the two cooling cavities, where each ejection port passes through a retracted period and a protracted period which together make up its production cycle, where the retracted period comprises an injection period and a cooling period and where the protracted period comprises an opening period, an extended period or point in time, and a closing period, the method comprising the step of desynchronizing the opening, extended and closing periods of a first ejection port with the respective opening extended and closing periods of a second ejection port.
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- Non-US Classification not provided for expired patents
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- Citation Ranking not provided for expired patents
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