Method and apparatus for leak testing

G - Physics – 01 – M

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G01M 3/32 (2006.01) B65B 57/00 (2006.01) G01L 21/12 (2006.01)

Patent

CA 2291181

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 vapour 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.

L'invention concerne un procédé et un appareil pour tester l'étanchéité de contenants fermés (9) qui sont remplis d'un produit renfermant au moins un composant liquide. Selon ce procédé, le contenant est introduit dans une cavité d'essai (1) qui est mise sous vide, au moins à la pression de vapeur du composant liquide. La pression dans la zone entourant le contenant (9) et par conséquent à l'intérieur de la cavité d'essai (1) est surveillée. Cette surveillance est effectuée par un détecteur de vide (7), la diminution de pression autour du contenant (9) étant réalisée par une pompe à vide (5). La perte d'étanchéité est détectée par surveillance d'une variation de pression dans la zone entourant le contenant (9), due à une évaporation de liquide provenant d'une fuite et se produisant dans la zone environnante à basse pression.

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