Abstract: The injection molding machine comprises a screw plunger (3), which rotates inside an injection unit (2), wherein the screw plunger (3) has, downstream from a metering zone a porous or permeable section (16) which can be charged with a physical expanding agent via an expanding agent feed device (18) in the screw shaft of the screw plunger (3) and which two-dimensionally introduces the expanding agent into the melt flow for molding of foamed shaped parts made of polymeric materials in an injection molding machine by an injection molding method.

Abstract: The invention relates to an injection molding machine for the injection molding of foamed shaped parts made of polymeric materials in an injection molding method by introducing a physical expanding agent into the melt flow. The injection molding machine comprise a screw plunger (3), which rotates inside an injection unit (2). According to the invention, the screw plunger (3) has, downstream from a metering zone a porous or permeable section (16) which can be charged with the expanding agent via an expanding agent feed device (18) in the screw shaft of the screw plunger (3) and which two-dimensionally introduces the expanding agent into the melt.