Closure membranes

Details Closure membranes Closure membranes

B - Operations, Transporting

65

D

B65D 51/16 (2006.01) B65D 41/20 (2006.01) B65D 53/00 (2006.01) B65D 77/22 (2006.01) B65D 81/24 (2006.01)

Patent

CA 2276120

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 sterilisation 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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