Coinjection hot runner injection molding system
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United States of America Patent
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Nov 22, 2016
Grant Date -
Aug 15, 2013
app pub date -
Oct 24, 2011
filing date -
Sep 21, 2010
priority date (Note) -
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Abstract
A coinjection molding apparatus is disclosed that provides a skin material melt stream and a core material melt stream to a nozzle. The skin material melt stream forms an inner and outer layer of a molded article with the core material melt stream forming a core layer between the inner and outer skin material layers. A volume of the core material for forming the core layer may be manually adjusted between injection cycles to change a thickness of the core layer between a first molded article and a second molded article. Alternatively, a volume of the core material for forming the core layer may be automatically adjusted during an injection cycle to change a thickness of the core layer during formation of the molded article, such that the molded article will have a core layer with at least a first thickness and a second thickness.
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