US Patent 6977104 Container preform assembly and method of manufacture

A preform assembly for blow molding a container includes a molded plastic preform having a body and a neck with an external surface. At least one circumferential channel is molded into the external surface of the preform neck for removing the preform from the forming mold. A plastic finish ring separate from the preform is externally secured to the preform neck over the external surface of the neck.