To mold an injection molded product so as not to form a pinhole or wrinkles in its main body or thick-walled part.
A freely movable slide core 9 is formed to the opposed mold part 4 facing to a cavity part 7 for molding the thick-walled part. A mold assembly 5 is clamped to inject the whole amount of a resin 10 used for molding the injection molded product in a cavity 6 to fully fill the main body molding cavity part 8 and a thick-walled part molding cavity part 7, of which the dimension in the thickness direction thereof is larger than that of the cavity part 8. Next, the slide core 9 is moved in the direction separated from the opposed mold part 4 while setting the dimension in the thickness direction of the main body molding cavity part 8 as it is not only to further increase the dimension in the thickness direction of the thick-walled part molding the cavity part 7 but also to inject gas in the thick-walled filling resin part 10a charged in the thick-walled part molding the cavity part 7.
WATANABE NOBUYUKI
MIZUNO TAKESHI
FUKUSHIMA SHINJI
Atsuo Mori
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