Abstract: Film structure of at least five layers, two outer layers (2) made of a polyolefin on which is each time provided, on the opposite sides, a layer (4) forming a gas barrier and whereby, between both above-mentioned gas barriers (4), is provided a layer (3) made of a foamed synthetic material, whereby the outer layers (2) consist of a mixture of a polyolefin and a binder, which makes it possible to bond this polyolefin with the layer (4) forming the gas barrier.
Abstract: Multi-layered film consisting of at least an inner layer (3) and an outer layer (2), with an intermediate layer (4) provided in between, whereby at least the inner and the outer layers (2-3) consist of a homopolymer of polypropylene and/or a copolymer of polypropylene, and whereby the intermediate layer (4) contains at least a mixture of a homopolymer of polypropylene and/or a copolymer of polypropylene with a thermoplastic elastomer, characterized in that the film (1) has a haze of 5% or less.