Injection molding torpedo with shaft having ceramic central...

Details Injection molding torpedo with shaft having ceramic central... Injection molding torpedo with shaft having ceramic central...

B - Operations, Transporting

29

C

B29C 45/30 (2006.01) B29C 45/00 (2006.01) B29C 45/27 (2006.01)

Patent

CA 2093588

Injection molding apparatus wherein a torpedo is mounted in the front end of a heated nozzle. The torpedo has spaced blades extending inwardly from an outer collar to an elongated shaft which extends centrally in the melt bore. The torpedo shaft has an elongated central portion which is securely press fitted in a steel outer sleeve from which the blades extend. The elongated central portion of the torpedo shaft extends forwardly into the gate, and is formed of an engineered ceramic such as silicon carbide which is very thermally conductive as well as abrasion and corrosion resistant. In one embodiment, the gate extends through a gate insert which is also formed of a thermally conductive and abrasion and corrosion resistant engineered ceramic material.

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