Throttled-core-centering injection molding
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United States of America Patent
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Sep 15, 2009
Grant Date -
Sep 27, 2007
app pub date -
Jun 24, 2005
filing date -
Jul 15, 2004
priority date (Note) -
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Abstract
In a method of injection molding a plastic product having a base wall and a sidewall (24), wherein plastic injected into a base-wall section of the mold cavity is conducted through a flow guide (28) in the base-wall section and thence into a sidewall section (24) of the mold cavity, a portion of a base-wall section flow guide is shaped by partially opposing a row of successive recesses (33) in a first mold part with a series of successive recesses (34) in a second mold part, with the recesses in the first mold part being so staggered with respect to the recesses in the second mold part as to provide a chain of overlapping recesses that form a sequence of variable-opening throttles (30) having openings that can vary whenever the alignment between the first and second mold parts varies. The recesses (34) in the second mold part are more than the recesses (33) in the first mold part.
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