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

1974-08-19

1976-04-13

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264318, 425DIG209, 425DIG214, B29C 1707

Patent

active

039504689

ABSTRACT:
This is a method 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 injected 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 blowing fluid outlet intermediate the ends of the core rod. Grooves in the core rod near both ends of the parison prevent shrinkage of the plastic as it cools and prevent shortening of the length of the parison.

REFERENCES:
patent: 3313873 (1967-04-01), Dembiak
patent: 3597517 (1971-08-01), Smith
patent: 3854191 (1974-12-01), Holbrook

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