Patent ID: 8002540

Claim:
A neck block of a molding tool for the production of a hollow body preform by means of injection molding, wherein the neck block has a main body with a shaping surface which is adapted to the external contour of a neck portion of the hollow body preform to be produced and is provided to come into contact in the injection molding operation with the neck portion of the hollow body preform, wherein furthermore there are provided at least one cooling passage for a cooling fluid which at least portion-wise extend substantially parallel to the shaping surface, an inlet and an outlet and an inlet passage and an outlet passage which connect the inlet and the outlet respectively to the cooling passage, wherein the cooling passage is arranged closer to the shaping surface than the inlet and the outlet, where the cooling passage has at least one portion which extend substantially parallel to the shaping surface and which extends within the main body so that all of the walls of the portion which extends within the main body are formed by the main body, and a connecting portion which adjoins said portion and the walls of which are formed in part by the main body and in part by a closure element fitted onto the main body and a cross-section of the connecting portion walls are formed in part by the main body an in part by the closure element.