Device and method for the injection molding of a molded part comprising at least one void

Device for the injection moulding of a moulded part (2) comprising at least one void (1), wherein the void (1) extents at least in sections in the direction of a longitudinal axis (L) of the moulded part (2) with an injection moulding tool (3, 4) comprising at least two parts and having a cavity (5), which cavity (5) has at least one cavity section extending in the direction of the longitudinal axis (L), wherein the injection moulding tool (3, 4) has at least one melt injection opening (6) for plastic melt, wherein the injection moulding tool (3, 4) has an inlet aperture (7) for a fluid injection nozzle (8), wherein a projectile (10) can be positioned at the fluid injection nozzle (8) in the region of the fluid aperture (9), which projectile (10) can be caused to flow in the direction of the longitudinal axis (L) through the still melted plastic due to the injected fluid,

• characterized in that
• the fluid injection nozzle (8) comprises a section (11) entering into the cavity (5), which section (11) is free from any undercut in a direction (E) of insertion of the fluid injection nozzle (8) into the cavity (5), wherein an angle (α) is arranged between the longitudinal axis (L) and the direction (E) of insertion, which angel (α) is at least 30°.