Abstract: A hot runner nozzle (1) for injection-molding forms has a nozzle body (2) with a throughput channel (3) connected to a nozzle exit (5) for melts. At least one jacket-heating unit (8) is located at the exterior perimeter of the nozzle body (2). This heating unit is enclosed at its exterior perimeter by a sleeve (10), which is flexible in the radial direction. The sleeve (10) is enclosed at its exterior perimeter by at least one circular lock (11) that rotates about its longitudinal axis (12) relative to the sleeve (10) between a released position and a clamped position. The facing surfaces of the sleeve (10) and the lock (11) each have a profile that deviates from that of a cylindrical shell located concentric to the longitudinal axis (12).

Abstract: An open injection-molding nozzle (1) is provided having a needle (2) which can be moved in its longitudinal direction within the nozzle (1) in the direction of its tip (3). The needle (2) can be retracted such that between the opening (4) leading into the mold or its cavity and this needle tip (3), annular slots of different size can be formed in adaptation to the current injection-molding phase or the process of opening of the mold.