Importance

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Abstract

A nozzle for the injection molding of thermoplastic materials includes a nozzle body having a first bore for establishing a flow path for a molten thermoplastic. A first end of the nozzle body is adapted for fluid connection with a sprue of an associated mold body, and a second end thereof is adapted for fluid connection with an end of an associated injection molding machine. The nozzle body also includes a second bore. A first valve assembly, which is adapted for reciprocating movement in the nozzle body second bore, is provided to control the flow of plastic through the nozzle body. The first valve member includes a body having a tip portion and a fluid passage formed in the body and open at one end through the tip portion. A connection member is provided for communicating the valve body fluid passage with an associated source of pressurized fluid. An actuator member is provided for selectively actuating the first valve member to a closed position thereby preventing the flow of plastic through the nozzle body. A second valve assembly is provided for preventing the flow of plastic through the valve body fluid passage and for regulating the flow of pressurized fluid in both directions through the valve body fluid passage.

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First Claim