| 摘要 |
The injection molding method according to the present invention selectively carries out a single layer molding operation in which injection units for measuring resins while plasticizing the former to inject them to a cavity part are connected together, and only desired resins in one of the injection units are injected into the cavity part to thereby mold a single layer molded product; and a multiplayer molding operation in which mixed resins formed when resins are changed in one of the injection units are injected into the cavity part so as to constitute a core layer, and desired resins in the other of the injection units are injected into the cavity part so as to constitute a skin layer thereby molding a molded product of a multilayer construction. With this, even where the mixed resins formed at the time of switching the resins are used as materials for molded products, no inconvenience occurs on the surface of the molded products, and molding by the mixed resins can be carried out along with the switching operation of the resins.
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