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Process for detecting leaks in sealed packages

A packaging and indicator technology, applied in fluid tightness testing, application of light to test fluid tightness, measuring devices, etc., can solve problems such as increasing oxygen content

Inactive Publication Date: 2007-01-03
CRYOVAC ILLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the rate at which atmospheric oxygen enters the leaking package is slow, it may take a long time to significantly increase the oxygen content within the package.

Method used

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  • Process for detecting leaks in sealed packages
  • Process for detecting leaks in sealed packages
  • Process for detecting leaks in sealed packages

Examples

Experimental program
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Embodiment Construction

[0046] As used herein, the phrases "heat-shrinkable film," "heat-shrinkable film," and the like refer to a film that has been oriented in the solid state (as opposed to blown film, which is formed at, above, or near the melting point of the polymer). oriented). When a heat-shrinkable film is heated, the tension on the film increases if the film is restrained from shrinking. As a corollary, the phrase "heat-shrinkable" refers to a heat-shrinkable film or film thereof that has been subjected to heat such that the film or a portion thereof has been placed in a heat-shrunk state, i.e. reduced in size (unrestrained) or increased in tension (restrained). part. Preferably, the heat-shrinkable film has a total free heat shrinkage (i.e. machine direction plus transverse direction) of at least 5%, more preferably at least 7%, still more preferably at least 10% in each direction at 185°F, Still more preferably at least 15%, and still more preferably at least 20%. The total free shrink...

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Abstract

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 O2-sensitive product with a multilayer film comprising (i) a leak-indicator layer in which a O2- sensitive indicator is present throughout the leak-indicator layer; and (ii) an O2-barrier layer outward of the leak-indicator layer. A low O2-environment is provided within the package. The leak-indicator layer. A low O2-environment is provided within the package. The leak-indicator layer is then illuminated with light containing a wave-length absorbed by the O2-sensitive indicator, so that the O2-sensitive indicator produces an emission of radiation in an amount inversely proportional to a level of O2 present with the O2-sensitive indicator. The then multilayer film is scanned while the O2-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.

Description

field of invention [0001] The present invention relates to a method of detecting leakage of packages containing oxygen-sensitive products, ie packages having a low oxygen content inside. Background of the invention [0002] Oxygen destroys many products. Food, beverages, pharmaceuticals, medical devices, corrodible metals, analytical chemicals, electronic equipment, and many other products that are stored in the presence of oxygen for extended periods of time can cause spoilage or shorten shelf life. To overcome this problem, packaging manufacturers have developed packaging materials and systems to protect such products by providing a packaging environment or "headspace" with reduced oxygen content. [0003] Methods of reducing the oxygen content may be packaging under vacuum or evacuating the atmosphere around the product and replacing it with a modified atmosphere (low oxygen content). In many cases, the low levels of oxygen achievable with such pa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M3/38G01M3/22G01N31/22G01N21/64G01N21/78
CPCG01M3/226G01M3/38G01N31/225G01N21/6428G01N21/783G01N2021/6432
Inventor M·R·黑文斯
Owner CRYOVAC ILLC
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