| 摘要 |
A process for molding a thermoplastic material includes the aspect of venting fluid through a bore in a valve member of a nozzle body through which thermoplastic material flows. The nozzle body is communicated with a mold space into which the thermoplastic material flows. The mold space is defined by mold surfaces. Then the valve member is actuated to allow thermoplastic material to flow through the nozzle body into the mold space. Subsequently, pressurized fluid is allowed to flow through the valve member bore into the thermoplastic material in the mold space to form a cavity in the thermoplastic material. Then the valve member is actuated to terminate the flow of thermoplastic material through the nozzle body. The pressurized fluid is allowed to flow through the valve member bore into the fluid cavity. Finally, the pressurized fluid is vented from the fluid cavity to the valve member bore.
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