Container with side sealing closure and method of forming the se

Details Container with side sealing closure and method of forming the se Container with side sealing closure and method of forming the se

1977-03-10

1978-08-15

Hart, Ro E.

Bottles and jars

Closures

Cap type

215341, 215344, B65D 4104

Patent

active

041066545

ABSTRACT:
An improved seal between a flexible plastic container and its closure cap, wherein the cap is provided with an internal annular shoulder engaging the tapered side surface of an annular lip provided by the neck of the container. The shoulder bears inwardly against the lip with a force sufficient to flex that lip inwardly and maintain the same in a condition of stress. Ideally, the cap is formed of a plastic of limited heat shrinkability at autoclaving temperatures; therefore, heat sterilization of the sealed container and its contents results in slight contraction of the cap and further increases the integrity of the seal. Where the container is formed of plastic material capable of softening slightly at autoclaving temperatures, the shoulder tends to penetrate the lip to a limited extent during such autoclaving to create an undercut in the lip. Later, when the contents of the container are to be used, removal of the closure produces an audible click as the shoulder is drawn from the undercut, thereby indicating that the seal has been broken.

REFERENCES:
patent: 2952374 (1960-09-01), Pryale
patent: 3224617 (1965-12-01), Hohl
patent: 3592349 (1971-07-01), Baugh
patent: 3815771 (1974-06-01), Marks
patent: 3817418 (1974-06-01), Mastrovito
patent: 3851784 (1974-12-01), Gryncewicz
patent: 3901404 (1975-08-01), Feldman
patent: 3923179 (1975-12-01), Choksi
patent: 3923184 (1975-12-01), Choksi

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