APPLICATION OF PARISON TO BALLOON COVERED CORE ROD

摘要

This invention controls the application of a parison to a core rod in the cavity of the injection mold of injection blow molding apparatus. The invention is particularly useful for core rods that include a balloon which covers the outside surface of the core rod and over which the parison is applied. Elastomer material of which the balloon is made is eventually eroded by the hot blast of plastic injection against the end of the core rod in the conventional manner. This invention covers most of the core rod with a protecting metal tube in the mold cavity and applies the plastic as a rolling wave instead of a blast impact.