Amcor Flexibles Singen Gmbh

Amcor Flexibles Transpac Bvba

Bert De Schoenmaker

Tony Malfait

Christoph Dietrich

Lieven Plaetinck

Steven Welvaert

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 (). The composite film () comprises an outer support layer () made of a metal film and an inner multilayer membrane () laminated to the outer support layer () using a bonding layer (). The membrane () has a consecutive layer structure from the outside to the inside consisting of a backbone layer () made of polypropylene, an intermediate layer () made of a partially crystalline polyamide and a cohesively breakable peeling layer () made of polypropylene, polyethylene and talc, wherein between the intermediate layer () and the backbone layer () as well as between the intermediate layer () and the peeling layer () there is arranged a tie layer () made of a maleic acid anhydride grafted polypropylene. The membrane has further an innermost sealing layer () made of a random copolymer comprising monomers of propylene, ethylene and butylene, wherein the random copolymer is grafted with maleic acid anhydride. The softening point of the sealing layer () lies at least between 15 and 25&#xb0; C. lower than that of the tie layers (). A use and a method of producing said composite film () are also disclosed.

Composite film

A single-serve portion pack may have a multilayer film structure including a protective layer, a print, a base layer and a peelable seal layer. The print is situated in-between the protective layer and the base layer. The protective layer is a polyalkylene terephthalate based layer having a stress value at 20% strain, at 90&#xb0; C., comprised between 5 and 20 MPa (preferably between 5 and 15 MPa), and a melting peak temperature comprised between 190 and 240&#xb0; C. (preferably between 200 and 230&#xb0; C.).

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Oostakker, Belgium

Bert De Schoenmaker