Apparatus for injection-molding three-layer moldings
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United States of America Patent
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Apr 13, 1999
Grant Date -
N/A
app pub date -
Dec 4, 1996
filing date -
Feb 19, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Apparatus of injection molding three-layer moldings, especially bottle blanks with an inner and an outer layer of polyethylene terephthalate and a middle layer of recycled polyethylene terephthalate, employing a mold with several cavities. The material (component A) for the inner and outer layers is supplied through one molten-component conveying channel and the material (component B) for the middle layer through another molten-component conveying channel. The channels are separately heated and their temperatures independently regulated. The melt for component A flows the same distance as the melt for component B. The melts flow into the injection-molding dies such as to ensure a uniform front.
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