| 摘要 |
PURPOSE:To mold a resin hollow article consisting of a hollow part whose inner face shape requires accuracy in size and a hollow part whose inner face shape requires no accuracy in size by molding the hollow parts by blowing high-pressure gas thereinto while molding the hollow part alone, whose inner face shape requires accuracy in size and complex characteristics, by using a soluble core. CONSTITUTION:A soluble core 11 is set in a core setting space 22a in a hollow-article mold 20. A molten thermoplastic resin B is injected into a hollow-article molding cavity 22 of the hollow-article mold 20 through a resin injection passage 21 and is packed in the hollowarticle molding cavity 22. High-pressure gas is blown into the hollow-article mold 20 through a base end opening 13a of a gas blowing nozzle 13 and is allowed to flow into a gas packing space 22b through a tip end opening 13b of the gas blowing nozzle 13 to be packed thereinto, thus a hollow part 4 whose inner face shape requires no accuracy in size is formed integrally with a hollow part 3 whose inner face shape requires accuracy in size by said gas. After the thermoplastic resin B has been cooled for curing, a molded article 28 is taken out of the hollow- article mold 20 to be put into a core eluting vessel 30 containing heated oil 31, and the soluble core 11 is eluted, thereby molding a resin hollow article 1. |
