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US 6,185,987 B1Granted
Method for tightness testing of closed containers, test chamber, test system, and tester therefor
OwnerMartin Lehmanninventor
Life of this patent
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Abstract
In order to obtain a reliable idea of the state of tightness for tightness testing of containers filled with liquids in which a pressure differential Δp is created between the interior of the container and its exterior, and also relative to the container wall in contact with the filling, an impedance measurement (7) is performed using measuring electrodes (3a, 3b) on the exterior of container (1).
Claims19
A method for producing liquid content-filled containers, comprising the steps of:
- filling a liquid filling content into a receptacle to at least partially fill said receptacle with liquid filling content;
- sealingly closing the filled receptacle;
- snugly enclosing the filled receptacle by the wall surface of a sealingly closable test chamber, said wall surface of said chamber having electrically conducting and electrically isolating surface areas;
- producing a pressure differential relative to the environment in the test chamber and the interior of the receptacle and measuring electrical impedance between at least one pair of said electrically conducting surface areas as leakage indication;
- and
- freeing the container for further exploitation, if the leakage indication satisfies non-leakage requirements.
3 more elements
Dependencies are inferred from the claim text.