| 摘要 |
PROBLEM TO BE SOLVED: To obtain a molded product having no damage in its decoration member, generating no sink or weld line and good in appearance, by using a mold equipped with a plurality of injection filling functions to perform specific compression injection molding and injecting compressed gas if necessary. SOLUTION: A molten resin 30 is injected into the cavity of a mold 20 having a decoration member 3 arranged thereto and closed in the presence of a compression margin 4 from a injection filling port 25A provided to the part opposed to the rear surface of the decoration member 3 of the mold 20 and spread while the mold 20 is closed and, thereafter, a molten resin is injected from the other injection filling ports 25B, 25C provided to the part of the mold 20 opposed to the non-decoration part slightly separated from the outer edge of the decoration member 3 to fill the cavity of the mold 20. Thereafter, compression force is reduced and compressed gas is injected into the cavity from the injection port provided to the surface of the part where a thick-walled part 5 is formed of the mold 20 to again increase compression force. By this constitution, a weld line is not generated and the appearance quality and strength of a molded product can be enhanced. |
