| 摘要 |
An injection molding apparatus is provided that comprises a molding tool having a mold cavity, a source of pressurized gas, and a nozzle with a reciprocable pin, the pin valving gas injection into the molding cavity. A gas valve is positioned adjacent the nozzle, the gas valve selectively connecting the gas source with the nozzle. A nozzle having a reciprocable member for valving fluid injection in an injection molding apparatus is also provided. The nozzle includes a seal comprising a compressible elastomeric member and a sleeve, the reciprocable member slidable in the sleeve. Compression of the elastomeric member deforms the sleeve, creating a fluid seal with the reciprocable member.
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