Closure cap and thin walled container

Details Closure cap and thin walled container Closure cap and thin walled container

1988-08-11

1989-08-01

Norton, Donald F.

Bottles and jars

Closures

Closure expands responsive to internal receptacle pressure

B65D 4104

Patent

active

048527530

ABSTRACT:
A closure cap is disclosed for sealing containers and particularly for sealing thin-walled vacuum formed containers with threaded rims. The closure cap is a composite closure having a molded plastic ring for engaging the container and for mounting a disc-like metal cover. The metal cover includes a vacuum indicating disc particularly adapted for providing a positive indication for relatively low vacuums and the closure cap is adapted for being sealed onto the container with a combination of press-on and screwing action to provide for high speed vacuum sealing. The vacuum indicating action of the vacuum button is improved by providing a channel in the plastic ring at the edge of the metal cover for stablizing the button operation at the desired low vacuum levels.

REFERENCES:
patent: 2194004 (1940-03-01), Bukolt
patent: 3189210 (1965-06-01), Heisler

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