Method for molding foamable resin
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United States of America Patent
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Oct 25, 2016
Grant Date -
Jan 3, 2013
app pub date -
Apr 11, 2011
filing date -
Jun 15, 2010
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Abstract
Before generated air bubbles grow, only the edge of a portion where strength is not to be reduced is locally cooled and solidified to form a wall of fluid. After that, a pin (107) or the like is pressed into a molten resin portion inside the edge to reduce the volume of a cavity (3), thereby reducing the size of generated bubbles. Alternatively, foaming gas is absorbed into resin so as to reduce the volume of generated air bubbles. Thus, a reduction in strength is suppressed.
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