Abstract: A blow pin assembly is provided for inflating a parison and forming the neck portion of a plastic container in a blow molding apparatus. The blow pin assembly is mountable to a blow rod. It includes a blow pin body including an exterior surface having a tapered portion and a cutting edge beneath the tapered portion. The tapered portion cooperates with the master seal of the mold to automatically center the assembly before the cutting edge engages the shear steels to sever the blow molded article from the mold. The cutting edge adjoins a rim extending substantially perpendicularly from the blow pin body, and can be resharpened one or more times.

Abstract: A blow pin assembly is provided for inflating a parison and forming the neck portion of a plastic container in a blow molding apparatus. The blow pin assembly is mountable to a blow rod. It includes a blow pin body including an exterior surface having a tapered portion and a cutting edge beneath the tapered portion. The tapered portion cooperates with the master seal of the mold to automatically center the assembly before the cutting edge engages the shear steels to sever the blow molded article from the mold. The cutting edge adjoins a rim extending substantially perpendicularly from the blow pin body, and can be resharpened one or more times.

Abstract: An assembly for inflating a parison and forming the neck portion of a plastic container in a blow molding machine is provided. The assembly includes a blow rod, a blow pin mounted to the blow rod, and a heat sink for removing heat from the blow pin. The heat sink includes flow channels for facilitating the dissipation of heat. It is located in proximity to the shearing edge of the blow pin to enable the removal of heat therefrom. As the shearing edge of the blow pin is maintained at a relatively low temperature, the blow molding machine can be operated at faster cycle times without reducing the sealing capability of the container neck portion.