CORE ROD FOR INJECTION BLOW MOLDING MACHINE

摘要

A core rod for an injection molding machine having an axially disposed blow air conduit connected to a valve at the free end of the core rod, and an annular passageway around the air conduit for flow of a temperature control fluid. The temperature control fluid is preferably channeled in a two- pass or alternatively in a double-spiral flow pattern. This core rod is particularly suited for use in biaxial orientation blow molding wherein rapid and accurate temperature control of the parison is required.