Closure membranes
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Feb 6, 2001
Grant Date -
N/A
app pub date -
Jun 9, 1999
filing date -
Jun 24, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Closure membrane for containers having an outer film and inner film with a joining layer and a sealing seam zone between these two films. At least one space free of a bonding layer is provided within the sealing seam zone between the outer film and the inner film and, within the limits of this non-bonded space, the outer film and the inner film each feature at least one opening, and a reservoir of material that softens under the influence of heat is provided in the non-bonded space between the outer film and the inner film. The openings in the inner film and the openings in the outer film are connected to enable the passage of a fluid such as a gas from the interior of the container to the surrounding atmosphere. On application of heat to the closure membrane e.g. during a sterilization process, the openings in the inner film and the outer film are closed off as a result of softening of the material that softens under the influence of heat.
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