Sprueless plastic material injection molding injection apparatus

Apparatus for the sprueless injection molding of parts from polymeric plastic material, comprising an injection mold having a cavity therein, a nozzle provided with a closing valve disposed there within for injection plastic material from the forward end of the nozzle into the mold cavity, a gate passage disposed between the front end of the nozzle and the mold cavity, means for cooling the walls of the gate passage to congeal plastic material which remains therein after injection of plastic material into the mold cavity, the closing valve having a valve member which reciprocates within the gate passage toward and away from the mold, the valve member having a first valve seat thereon cooperating with a second valve seat on the nozzle, the valve member having an elongated forward end portion which, when the valve member is in valve closed position engages the walls of the gate passage and which when the valve member is in valve opened position is spaced from the walls of the gate passage to permit the flow of plastic material through the gate passage and along the elongated forward end portion of the valve member, the elongated forward end portion of the valve member having a forward end surface which engages the rear end surface of the molded part in the mold cavity.