Method for molding a threaded bunghole

Details Method for molding a threaded bunghole Method for molding a threaded bunghole

1977-06-28

1978-09-19

Hoag, Willard E.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264322, B29C 506, B29D 2303

Patent

active

041154967

ABSTRACT:
A method for molding a threaded bunghole in a blowmolded article is disclosed. The method comprises the steps of: positioning a parison between open mold sections, partially extending a threaded pin assembly into one end of the parison, partially closing the mold sections, fully extending the pin assembly when the threads on the pin assembly are filling up with a portion of the parison, completing closure of the mold sections, and then expanding the parison into contact with the blow cavity formed by the mold sections.

REFERENCES:
patent: 3090079 (1963-05-01), Gottschald
patent: 3487501 (1970-01-01), Siard et al.

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