| 摘要 |
A method of injection molding includes the steps of providing a source of pressurized flowable material, a source of pressurized fluid, and a mold assembly actuatable from an open position to a closed position. The mold assembly includes first and second matable mold portions that define a substantially sealed cavity, an inflatable core member positioned within the substantially sealed cavity and secured to the first mold portion, a pressurized fluid path from the source of pressurized fluid through the first mold portion to the inflatable core member, and a flowable material path from the source of pressurized flowable material into the cavity. The pressurized fluid is introduced into the inflatable core member at a first pressure to provide an inflated core member that defines a core boundary and the pressurized flowable material is injected into a space defined by the cavity and the core boundary at a pressure less than the first pressure. After the flowable material transitions to a solid state, the pressurized fluid is removed from the inflated core member, the mold is opened, and the solid article is removed from the mold assembly.
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