Package integrity detection method

Details Package integrity detection method Package integrity detection method

1991-03-04

1992-09-29

Razavi, Michael

Measuring and testing

With fluid pressure

Leakage

73 52, G01M 326

Patent

active

051506050

ABSTRACT:
There is disclosed a method for determining the proper sealing of a hermetically sealed package. The method consists of the steps of providing a pressure source for effecting a movement of air mass, providing an enclosable vacuum chamber suitable for accommodating a hermetically sealed package therein being enclosable in sealing tight engagement. An air flow path is provided from the vacuum chamber to the pressure source, the air flow path having a valve interposed to isolate the vacuum chamber from the pressure source. The air flow path is provided with a mass flow transducer and a pressure differential measuring device. A hermetically sealed package is placed in the vacuum chamber and by activating the isolating valve to connect the vacuum chamber to the source of pressure, a flow of gas is effected through the air flow path activating the pressure differential measuring device to determine the rate of mass flow of gas through the mass flow transducer as a function of time. This data is then compared to a standard reference index which determines the integrity of the package seal.

REFERENCES:
patent: 4503712 (1985-03-01), Vigneaux
patent: 4593554 (1985-02-01), Aarts
patent: 4660408 (1987-05-01), Lewis
patent: 4686856 (1986-05-01), Vavra et al.
patent: 4689987 (1987-09-01), Aarts
patent: 4858463 (1989-08-01), Rosse et al.
patent: 5029464 (1991-07-01), Lehmann

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