| 摘要 |
PURPOSE: A valv -gate bushing for gas-assisted injection molding is provided to efficiently block off the flow of plastic material into the mold as desired, allow the entry of the gas into the mold cavity, prevent the plastic material from plugging or clogging the gas orifices, and prevent the gas from flowing or entering back into the bushing and plastic material supply. CONSTITUTION: The valve-gate bushing includes movable shut-off mechanisms which selectively facilitate or prevent the passage of molten plastic material into mold cavities. One or more apertures, such as holes, openings, channels, slits, slots, and the like, are provided at or adjacent the end of the pin members or at the end of the devices. The apertures are thin or small and have dimensions which will allow the passage of gas and at the same time prevent the plastic material from plugging or clogging the apertures.
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