Measuring and testing – With fluid pressure – Leakage
Patent
1996-11-06
1998-06-02
Brock, Michael
Measuring and testing
With fluid pressure
Leakage
G01M 340
Patent
active
057602956
ABSTRACT:
A method for inspecting a sealed package, wherein whether the sealed package has any pinholes or not can be efficiently determined without damaging the sealed package packaged with electrically insulating films and without any dangers caused by a voltage applied to electrodes in the inspection. A sealed package 3 in which electrically conductive contents 1 such as fluid are wrapped with electrically insulating films 2 is sandwiched between a pair of electrode plates 4.sub.1, 4.sub.2 facing each other, which are connected with a capacitance meter 10. An end portion 3a to be inspected which is most liable to have pinholes in the sealed package 3 is immersed in salt water (one percent sodium chloride solution) 5 with which a stainless tank 6 connected with one electrode plate 4.sub.2 of the pair is filled, and the capacitance between both the electrode plates 4.sub.1, 4.sub.2 is measured. The measurement is compared with the measurement for a sealed package 3 which has no pinholes to determine whether the inspected sealed package has any pinholes or not, based on the change of the measurement.
REFERENCES:
patent: 3855531 (1974-12-01), Fielibert et al.
patent: 4135384 (1979-01-01), Burwell, Jr. et al.
patent: 4243932 (1981-01-01), Kakumoto et al.
patent: 4803868 (1989-02-01), Vinton et al.
patent: 5535618 (1996-07-01), Konieczka
Brock Michael
Joven Denki Kabushiki Kaisha
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