| 摘要 |
The present invention relates to a process for detecting a leak in a package. The process comprises preparing a package by covering at least a portion of an O<SUB>2</SUB>-sensitive product with a multilayer film comprising (i) a leak-indicator layer in which a O<SUB>2</SUB>-sensitive indicator is present throughout the leak-indicator layer; and (ii) an O<SUB>2</SUB>-barrier layer outward of the leak-indicator layer. A low O<SUB>2</SUB>-environment is provided within the package. The leak-indicator layer is then illuminated with light containing a wavelength absorbed by the O<SUB>2</SUB>-sensitive indicator, so that the O<SUB>2</SUB>-sensitive indicator produces an emission of radiation in an amount inversely proportional to a level of O<SUB>2 </SUB>present with the O<SUB>2</SUB>-sensitive indicator. Then the multilayer film is scanned while the O<SUB>2</SUB>-sensitive indicator is emitting radiation, the scanning being carried out by sensing and comparing the amount of radiation emitted from at least two different regions of the multilayer film.
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