Method of testing a package seal

Details Method of testing a package seal Method of testing a package seal

1987-10-28

1988-05-31

Levy, Stewart J.

Measuring and testing

With fluid pressure

Leakage

73 52, G01M 336

Patent

active

047472995

ABSTRACT:
A method of testing the integrity of a package seal (14) provided between a container portion (11) and a lid portion (12), includes the steps of: initially reducing the pressure acting on the outer surface of the container portion to cause the lid portion to bow inwardly to a position of substantially maximum concavity while maintaining the ullage volume within the package substantially constant; further reducing the pressure acting on the outer surface of the container portion to distend the container portion for increasing the volume of the ullage space; and sensing for a change in position of the distended container wall.

REFERENCES:
patent: 3751972 (1973-08-01), Hass
patent: 3837215 (1974-09-01), Massage
patent: 4188919 (1980-02-01), Egee et al.
patent: 4326408 (1982-04-01), Kanoh
patent: 4663964 (1978-05-01), Croce
patent: 4715215 (1978-12-01), Perhach et al.

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