| 摘要 |
A molding apparatus for producing a synthetic resin molded product, comprises a forming mold including a molding cavity 4, a gate 5 communicating with the molding cavity, and an overflow chamber 7 communicating with the molding cavity through a flow-out passage 6; a gas blow-in mechanism 8 for blowing gas into molten synthetic resin injected into the cavity through the gate so as to form a void in the molten synthetic resin in order to mold a hollow molded product with; and a flowout passage opening and closing mechanism 26 for closing the flow-out passage until the molten synthetic resin fills the molding cavity, and opening the flow-out passage when the gas blow-in mechanism is in operation. A second apparatus is also disclosed in which means are provided for blowing gas into the overflow chamber 7 in order to apply a dwell-pressure to the hollow moulded product formed in the moulding cavity 4. <IMAGE>
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