Injection molding alignment steering utilizing sequential throttles in base-wall-section flow guides
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United States of America Patent
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Jan 11, 2005
Grant Date -
Jul 17, 2003
app pub date -
Jan 15, 2002
filing date -
Jan 15, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
During injection molding of a plastic product having a base wall and a sidewall, alignment of the mold parts that shape the mold cavity is maintained by conducting injected plastic material through a sequence of variable-opening throttles in a base-wall-section flow guide of the mold cavity. The openings of the throttles vary in response to variations in the thickness of a region of the sidewall section into which injected plastic material is conducted from the base-wall-section flow guide so that upon an increase in the thickness of such region the openings of the throttles in the base-wall-section flow guide decrease and so that upon a decrease in the thickness of such region the openings of the throttles in the base-wall-section flow guide increase.
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