Application of parison to balloon covered core rod

Details Application of parison to balloon covered core rod Application of parison to balloon covered core rod

B - Operations, Transporting

29

C

18/517

B29C 49/44 (2006.01) B29C 49/06 (2006.01) B29C 43/12 (2006.01)

Patent

CA 1060163

ABSTRACT OF THE DISCLOSURE This invention controls the application of a parison to a core rod in the cavity of the injection mold of injec- tion 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 bal- loon 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.

236967

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