Pneumatic actuating mechanism for injection molding

Details Pneumatic actuating mechanism for injection molding Pneumatic actuating mechanism for injection molding

B - Operations, Transporting

29

C

18/711

B29C 45/23 (2006.01) B29C 45/28 (2006.01)

Patent

CA 1292849

ABSTRACT OF THE DISCLOSURE A multi-cavity valve gated injection molding system. The pneumatic actuating mechanism to reciprocate each elongated valve member includes a piston which reciprocates in a cylindrical opening through a cylinder plate. A sealing bushing which is mounted around each valve member has a flanged portion which bridges an insulative air gap between the manifold and the cylinder plate. Thus, the sealing bushing forms part of the piston cylinder as well as sealing against melt leakage around the reciprocating valve member. The piston has a circumferential outer band formed of a graphite alloy seated in a groove formed between a front portion and a removable rear plate portion.

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