Annular flow plastic extrusion nozzle or gate

Details Annular flow plastic extrusion nozzle or gate Annular flow plastic extrusion nozzle or gate

B - Operations, Transporting

29

C

18/706

B29C 45/36 (2006.01) B29C 45/30 (2006.01)

Patent

CA 1162375

ABSTRACT OF THE DISCLOSURE An annular flow plastic extrusion nozzle or gate is provided with a torpedo to heat the plastic to be extruded through the gate. A passage is provided around the torpedo and the torpedo has a flattened end in the parting line of the mold. An annular opening is provided around the base of the torpedo in the nozzle or gate housing. A conical recess is provided in the flat end of the torpedo to receive a correspondingly shaped male extension of a shaft or core pin removably mounted in a portion of the mold. A hub cavity in that portion of the mold may be provided around the end of the pin and mold cavities extend therefrom as desired to form propellers or impellers or rotors of the desired configuration. Discharge of the flowable plastic through the 360° annular nozzle or gate into the mold cavities prevents any compacting of the plastic and provides an even distribution and flow thereof whereby the resulting propeller, impeller or rotor has no heavy spots affecting even and uniform rotation about the pre- cisely centered core pin or shaft.

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