Measuring and testing – With fluid pressure – Leakage
Patent
1988-11-28
1989-12-19
Chapman, John
Measuring and testing
With fluid pressure
Leakage
G01M 336
Patent
active
048874574
ABSTRACT:
A soft package fabricated of a material with a memory is tested by placing the package in a vacuum. If there are no leaks in the package, the package undergoes a dimensional change as the vacuum is created. This dimensional change can be measured. If no dimensional changes occurs, the package has a gross leak. If the package increases in dimension and then gradually returns to its original shape, a slow leak exists. If the package grows in dimension upon creation of vacuum and retains that dimensional growth, there is no leak in the package. A test fixture for measuring the dimensional changes includes a base plate on which a package may be positioned. A support member is mounted on the base plate to support a plunger rod for reciprocal movement relative to the base plate. The plunger includes a first end that engages the package to be tested and a second end on which a platform is mounted. A counterweight is positioned onthe platform. The counterweight is of sufficient weight to overcome the memory force of the package material and return the package to its original dimension.
REFERENCES:
patent: 3343404 (1967-09-01), La Rosa et al.
patent: 3827215 (1974-09-01), Massage
Chapman John
Coe Roger N.
Miles Inc.
Roskos Joseph W.
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