An extrusion die for injecting plasticizable elastomers into a cavity of an injection-molding die, wherein the extrusion die is mounted on a cold-channel block which, for distribution of the material plasticized in a plasticization aggregate, is arranged between the aggregate and the injection-molding die. The extrusion die opening can be closed off with a needle that forms the extrusion-die-opening end of an insert that can be displaced in the extrusion die body and has a material transport channel. An external drive is provided for the displacement movement.