Apparatus for molding a plastic closure with air-assisted...

Details Apparatus for molding a plastic closure with air-assisted... Apparatus for molding a plastic closure with air-assisted...

2005-05-03

2005-05-03

McDowell, Suzanne E. (Department: 1732)

Plastic article or earthenware shaping or treating: apparatus

Female mold and charger to supply fluent stock under...

With product ejector

C264S335000

Reexamination Certificate

active

06887066

ABSTRACT:
An apparatus for molding a plastic closure includes a male mold assembly including a forming pin and an outer pin sleeve which cooperate with a female mold for defining a mold cavity. To facilitate mechanical stripping of a molded closure from the forming pin, pressurized air is introduced into the molded closure through at least one air passageway which extends axially between the forming pin and pin sleeve. By outwardly expanding and forming the plastic closure during ejection from the forming pin, forces to which the closure is subjected during ejection are significantly reduced, thereby desirably reducing the amount of cooling of the closure that is required during the molding cycle prior to ejection. Significantly increased operating speeds for the compression molding apparatus can thus be achieved.

REFERENCES:
patent: 4343754 (1982-08-01), Wilde et al.
patent: 4497765 (1985-02-01), Wilde et al.
patent: 4660801 (1987-04-01), Schad
patent: 5554327 (1996-09-01), Ingram et al.
patent: 5670100 (1997-09-01), Ingram
patent: 5786079 (1998-07-01), Alieri
patent: 5866177 (1999-02-01), Ingram
patent: 6177041 (2001-01-01), Bietzer
patent: WO0132390 (2001-05-01), None

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