Manufacturing method for resin molded product
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United States of America Patent
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Issued Date -
Mar 6, 2008
app pub date -
Aug 20, 2007
filing date -
Sep 4, 2006
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A cavity is formed with a convex pattern uniformly formed by electric casting on an inner peripheral face of a mold main body of an undivided and seamless configuration having a circular through hole. Next, a core is inserted to the cavity. Then, molten resin is injected into the cavity, a resin molded product having a concave pattern on the surface and the core in the center is molded, and the resin molded product is departed from the inner face of the cavity by reduction of outer diameter dimension with cooling shrinkage of the molten resin. And, the resin molded product is drawn out of the cavity.
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