Nozzle for plastic injection mould

Mold nozzle for injecting plastic material, the mold nozzle being positioned in a mold, said mold having an interior and a thickness, the mold nozzle including a cylindrical body forming sleeve associated with heating means and integrated in a receiving housing provided in the thickness of the mold, said mold nozzle having an upstream orifice and a downstream orifice, the mold nozzle opening out via said downstream orifice to the interior of the mold and said mold nozzle being adapted to receive via said upstream orifice material injected from a molding machine nozzle, and the mold nozzle having a first fixed cylindrical sleeve (3) immobilized in the mold, said first fixed cylindrical sleeve comprising said upstream orifice for admission of the material, the upstream orifice being adapted to receive in abutment an injection end of the molding machine nozzle, the mold nozzle further comprising a second slidable sleeve (4) colinear with respect to the first fixed cylindrical sleeve, said second slidable sleeve mounted to slide telescopically inside of the first fixed cylindrical sleeve, a first end (5) of the second sleeve, opposite a second end engaged in the first sleeve, coming into abutment against a wall (9) of a receiving housing (8) provided in the thickness of the mold (2), said receiving housing constituting an opening for emergence of the material molded in the mold, the injected material exerting a pressure on an upstream section (6') of the second slidable sleeve (4) thus tending to apply the first end (5) of this sliding sleeve against the wall (9) of the housing, ensuring tightness therebetween.