Vacuum decay is a non-destructive method to detect the leaks in empty containers, by the means of vacuum sensors which accurately monitor the vacuum level inside the containers.
Steps
Vacuum creating inside the containers
Stabilization: time needed to allow the vacuum to be distributed homogeneously
Testing: vacuum sensors measure the vacuum level inside the containers and at the end of the test phase give a vacuum decay Δ
Testing results: if the vacuum decay Δ exceeds a pre-set threshold, then the container is detected as leaking and automatically ejected
Pressure decay is a non-destructive method to detect the leaks in empty containers, by the means of pressure sensors which accurately monitor the pressure level inside the containers.
Steps
Pressure creating inside the containers
Stabilization: time needed to allow the pressure to be distributed homogeneously
Testing: pressure sensors measure the pressure level inside the containers and at the end of the test phase give a pressure decay Δ
Testing results: if the pressure decay Δ exceeds a pre-set threshold, then the container is detected as leaking and automatically ejected
This method is used with aerosol empty containers to comply with the FEA norms concerning the alternative method to the hot water bath test.
This test is performed with the container placed in an hermetically closed test chamber.
Steps
Introduction of the container in the test chamber
High pressure creating inside the container
Vacuum creating in the test chamber
Stabilization: time needed to allow the vacuum to be distributed homogeneously in the test chamber
Testing: special sensors make different measurements of the vacuum level in the test chamber and, in the end of the test cycle, all the measured values determine a vacuum level curve
Testing results: the testing curve is compared to a reference curve and the result of this comparison determine if the container is good or leaking