Method and apparatus for inspecting containers

Details Method and apparatus for inspecting containers Method and apparatus for inspecting containers

1979-01-23

1980-07-22

Watkins, Donald

Measuring and testing

Testing sealed receptacle

209599, G01M 300

Patent

active

042133297

ABSTRACT:
A method and apparatus are provided for inspecting vacuum-packed containers. The invention comprises automatically subjecting each container to be inspected to a predetermined force so as to cause each container to emit a click as a result of relative displacement of the container and its liquid contents, and determining whether the container has adequate vacuum by measuring the time interval between application of the predetermined force and the occurrence of the click. In a modification of the invention the pressure determenation is made by generating a signal having an amplitude that varies according to the intensity of the click.

REFERENCES:
patent: 2320390 (1943-06-01), Shmurak
patent: 2608089 (1952-08-01), Raymond et al.
patent: 3290922 (1966-12-01), Thompson
patent: 3441132 (1969-04-01), Browning
patent: 3596501 (1971-08-01), Forry et al.
patent: 3802252 (1974-04-01), Hayward et al.
patent: 3832885 (1974-09-01), Hayward et al.

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