Injection blow molding of container open at both ends

Details Injection blow molding of container open at both ends Injection blow molding of container open at both ends

B - Operations, Transporting

29

D

18/517

B29D 23/03 (1980.01)

Patent

CA 1078121

ABSTRACT OF THE DISCLOSURE This is a method and apparatus for injection blow molding plastic articles having an opening at both ends. Parisons are injected over core rods that extend all the way across the cavity of an injection mold so that the core rod extends beyond both ends of the parison. The parison is in- jected by "subterranean" gating, and cylindrical ends of the parison are confined in the blowing mold while the portions of the parison between the ends are blown by opening a blow- ing fluid outlet intermediate the ends of the core rod. Grooves in the core rod near both ends of the parison pre- vent shrinkage of the plastic as it cools and prevent shorten- ing of the length of the parison.

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