Device for Expansion Injection Moulding
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United States of America Patent
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Issued Date -
Oct 18, 2007
app pub date -
Apr 2, 2007
filing date -
Apr 12, 2006
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A device for expansion injection moulding, by which a polymer melt placed under pressure by a main pressure source can be injected from a storage chamber (4) into a mould cavity (3) by expansion of the polymer melt stored under pressure, the injection is optionally assisted by elastic deformation of the wall (8) of the storage chamber (4) and/or the wall (7) of a runner 6 leading to the storage chamber (4), the storage chamber (4) having an exit (5) which can be shut off, wherein the storage chamber (4) is arranged in a mould (1) which forms the mould cavity (3) and an additional pressure accumulator and/or an additional pressure source is (are) provided which is (are) capable of exerting additional pressure on the polymer melt during injection of the polymer melt into the mould cavity (3), in order to fill--preferably completely--the mould cavity (3).
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