Abstract: The invention relates to a multilayer film comprising the following sequence of layers: A) a basis layer of polyolefin foam, B) a layer based on at least one of the polyolefins of the foam layer A), C) optionally a tie layer based on a polyolefin, D) optionally an adhesive layer, E) optionally a gas- and/or flavortight barrier layer, F) an adhesive layer, G) an optionally sealable and/or peelable surface layer, whereby the total thickness of layers A) and B) ranges from 0.5 to 2 mm and the thickness of layer B) ranges from ? to ½ of the thickness of layer A).

Abstract: The inventive method for producing packaging materials consisting of a polyolefin foam layer (B) coated with a coating film (A) on at least one side, which packaging material is formable into self supporting packaging items, such as trays, by thermoforming or folding, comprises a coextrusion step or an extrusion lamination step in which step the bonding between the polyolefin foam layer (B) and the coating is achieved. With the extrusion lamination step, the method is as follows: In a first method step, a single-layer or multi-layer coating film (A) is produced by extrusion or coextrusion, in a second method step a polyolefin foam sheet (B) is produced by expansion and extrusion and in the third method step the polyolefin foam sheet (B) is coated with the coating film (A) by extrusion lamination, wherein a polyolefin bonding layer (30) is extruded between the foam sheet (B) and the coating film (A) and pressure is applied to the combination.

Abstract: The invention relates to a thermoformable sheeting consisting of a foam material or containing at least one layer of a foam material. The inventive sheeting is particularly applicable for thermoforming cups or trays for packaging and/or consuming food stuffs, by drawing or deep drawing the sheeting and expanding the foam material. The foam material of the inventive sheeting consists of a polypropylene blend containing between 50 and 100% of high melt strength polypropylene, has a density of 0.1 to 0.7 g/cm3, preferably between 0.25 and 0.5 g/cm3, and a cell number of from greater than 300 to 3000 cells per mm3, preferably between 800 and 2500 cells per mm3. The inventive sheeting can be drawn with a high drawing ration (e.g. 1.5) and expanded to be formed into containers even with difficult shapes, whereby no drawing problems arise and the containers produced show a homogeneous opaqueness.

Abstract: The invention relates to a thermoformable sheeting consisting of a foam material or containing at least one layer of a foam material. The inventive sheeting is particularly applicable for thermoforming cups or trays for packaging and/or consuming food stuffs, by drawing or deep drawing the sheeting and expanding the foam material. The foam material of the inventive sheeting consists of a polypropylene blend containing between 50 and 100% of high melt strength polypropylene, has a density of 0.1 to 0.7 g/cm3, preferably between 0.25 and 0.5 g/cm3, and a cell number of from greater than 300 to 3000 cells per mm3, preferably between 800 and 2500 cells per mm3. The inventive sheeting can be drawn with a high drawing ration (e.g. 1.5) and expanded to be formed into containers even with difficult shapes, whereby no drawing problems arise and the containers produced show a homogeneous opaqueness.

Abstract: A method in which a polyolefin foam layer is laminated to a sealing film having at least a first layer of a polyolefin. During the lamination a second layer is located between the first layer and the foam layer; the second layer is extruded therebetween and pressure is immediately applied. The second layer and the first layer are polyolefins each based on the same monomer as the main monomer of the foam layer. The same lamination technique may be used to laminate a sealing film to the other side of the foam layer, optionally at the same time as the lamination of the sealing film to the first side of the foam layer. Alternatively, the lamination technique may be used on one side of the foam layer, and the other side of the foam layer may be sealed by means of a coextruded layer.