Method for leak testing and leak testing apparatus
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United States of America Patent
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Jul 28, 2015
Grant Date -
Apr 23, 2015
app pub date -
Sep 4, 2014
filing date -
May 26, 1997
priority date (Note) -
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status (Latency Note)
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Abstract
For leak testing closed containers (9) which are filled with a filling product containing at least one liquid component the container is introduced in a test cavity (1) which is evacuated at least down to vapor pressure of that liquid component. The pressure in the surrounding of the container (9) and thus within test cavity (1) is monitored. Monitoring is performed by a vacuum pressure sensor (7), whereas lowering pressure surrounding the container (9) is performed by a vacuum pump (5). Leakage is detected by monitoring a pressure change in the surrounding of the container which is due to evaporation of liquid emerging from a leak and being evaporated in the low pressure surrounding.
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