Method for leak testing and leak testing apparatus
DCFirst Claim
1. A method for producing a closed and filled container comprising the steps of:
- filling a container with a material comprising at least one liquid component;
sealingly closing said container; and
leak testing said container by;
applying a pressure difference across at least a part of the wall of the container which part is to be tested by evacuating the surrounding of said container by means of a pumping arrangement;
lowering said pressure in said surrounding to a value at least according to vapor pressure of said at least one liquid component; and
monitoring the pressure in said surrounding as a leak indicative signal, thereby performing evacuation of said surrounding by said pumping arrangement at least substantially up to monitoring said pressure as a leak indicative signal.
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Litigations
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Accused Products
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.
42 Citations
20 Claims
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1. A method for producing a closed and filled container comprising the steps of:
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filling a container with a material comprising at least one liquid component;
sealingly closing said container; and
leak testing said container by;
applying a pressure difference across at least a part of the wall of the container which part is to be tested by evacuating the surrounding of said container by means of a pumping arrangement;
lowering said pressure in said surrounding to a value at least according to vapor pressure of said at least one liquid component; and
monitoring the pressure in said surrounding as a leak indicative signal, thereby performing evacuation of said surrounding by said pumping arrangement at least substantially up to monitoring said pressure as a leak indicative signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification