Importance

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Abstract

An apparatus for injection molding of plastics material in accordance with a gas or liquid injection method. The apparatus includes a nozzle which can be applied to the injection molding die or the injection mold. This nozzle enables selectively the sole injection of plastics material melt, the simultaneous injection of plastics material melt and medium as well as the sole injection of medium into the mold cavity of the injection molding die or injection mold. The melt is supplied to the nozzle mouth by the extruder screw cylinder of the extruder around a nozzle torpedo, while the medium is introduced into the nozzle so as to be spaced from the nozzle mouth. The automatic operation of the apparatus in the course of all three types of operation is made possible by locating a check valve in the melt supply line of the nozzle between the upstream end of the nozzle torpedo and the junction piece of the extruder screw cylinder, which check valve can be automatically brought into its closed position in direction counter to the extruder screw cylinder.

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First Claim