| 摘要 |
An injection molding heater assembly for use in multi-gate injection molding includes an elongate heating member extending within a mold bore in heating communication with the mold bore mold gates. The heating member has an elongate body portion extending between an inlet portion and an outlet portion. A melt injection passage extends through the inlet portion to convey melt along the body portion to an enlarged portion having a nozzle face. Extending down from the nozzle face are a series of members which include gate tips at their lower ends. Radial channels present in the gate tips serve as extensions to the mold bore mold gates. The gate tips are peripherally spaced apart around the nozzle face and define a recess between the gate tips, the nozzle face and the mold bore for initially injected melt to accumulate in and solidify to form a melt plug. The melt plug serves to insulate the subsequently injected melt from the mold bore and maintain the injected melt in a third condition.
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