Composite film
AssigneeAmcor Flexibles Singen GmbH
InventorsChristoph Dietrich, Klaus Hafner, Sven Bauer
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Abstract
A composite film for closing a container by sealing the composite film against a circumferential sealing surface of the container or of a cap ring to be connected to the container has a support layer made of a metal film and a sealing layer connected to the metal film. The sealing layer comprises a coextruded layer with a cohesively breaking intermediate layer and adhesion promoter layers arranged on both sides of the intermediate layer. The composite film is suitable for tight sealing against sealing surfaces made of polished tinplate.
Claims14
A method for closing a container, comprising sealing a composite film against a circumferential sealing surface of the container or of a cap ring to be connected to the container, wherein the sealing surface consists of polished tinplate, polished aluminum, or a heat-sealable, modified, metal surface, wherein the composite film has a support layer made of a metal film and a sealing layer, wherein the sealing layer comprises a coextruded layer with a cohesively breaking intermediate layer and adhesion promoter layers arranged on both sides of the intermediate layer, and wherein the adhesion promoter layers are made of a polypropylene modified with maleic acid anhydride (PP-MAH) and a thermoplastic plastic containing more than 50 wt. % polypropylene (PP) is used as the intermediate layer.
Dependencies are inferred from the claim text.