Miniaturized for gas-assisted injection molding

An apparatus for molding a plastic part, comprising:

• an injection molding machine adapted for plasticizing and discharging thermoplastic materials, said injection molding machine having an outlet end;
• a mold body including a core portion and a cover portion wherein a mold cavity is defined between said core portion and said cover portion, said mold cavity being adapted for receiving the thermoplastic materials from said injection molding machine, and a mounting aperture located in said cover portion and communicating with said mold cavity;
• a sprue body secured in said mold body mounting aperture;
• a nozzle body secured in said mold body mounting aperture, said nozzle body having an inlet end in communication with said injection molding machine, a discharge end operatively connected and in communication with said sprue body and a fluid passage extending from said inlet end to said discharge end;
• and,
• a first valve for controlling a flow of the thermoplastic material through said nozzle body fluid passage.

A nozzle for injecting a viscous fluid and a non-viscous fluid, comprising:

• a nozzle body having an inlet end, a discharge end and a flow passage extending from said inlet end to said discharge end;
• a shut-off needle disposed for reciprocating movement in said nozzle body flow passage to control a flow of the viscous fluid through said nozzle body discharge end;
• a non-viscous fluid flow passage extending in said shut-off needle and terminating at a front end thereof;
• and,
• a shut-off pin disposed for reciprocating movement in said non-viscous fluid flow passage of said shut-off needle to control a flow of fluid through said non-viscous fluid flow passage, wherein said shut-off pin in one position has an end which extends out of said needle to allow an outflow of the non-viscous fluid.