Injection molding valve gating one of two nozzles in tandem

Details Injection molding valve gating one of two nozzles in tandem Injection molding valve gating one of two nozzles in tandem

B - Operations, Transporting

29

C

18/703

B29C 45/20 (2006.01) B29C 45/27 (2006.01) B29C 45/28 (2006.01)

Patent

CA 1261575

ABSTRACT This invention relates to an injection molding system having an axially aligned forward and rearward heated nozzle mounted in tandem. The rearward nozzle is seated in a fixed position, while the forward nozzle reciprocates between a retracted open position and a forward closed position to provide valve gating. The forward nozzle has a rearwardly extending sleeve portion which projects into the rearward nozzle to connect the melt bores of the nozzles as the forward nozzle reciprocates. The forward nozzle has a heated nose portion with a tip which seats in the gate in the closed position. A pneumatically actuated piston bears against the rear end of the forward nozzle to drive it to the closed position. Injection melt pressure around the nose portion drives the forward nozzle back to the open position.

563980

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