Abstract: The invention relates to a polymer-coated heat-sealable packaging material, its manufacturing method and a sealed package manufactured thereof. The material comprises a fibre base (3), which is a packaging paper or packaging board, an outer polymeric heat sealing layer (1, 8), which is, for example, LDPE, and an inner polymeric water vapour barrier layer (2, 7), which according to the invention is partly or totally formed of cycloolefin copolymer (COC). The COC water vapour barrier and the heat sealing layers are brought onto the fibre base by extrusion, and they can be placed on one side or on both sides of the fibre base for achieving a moisture barrier on both sides of the package. Also polymeric oxygen barrier layers, such as EVOH or polyamide layers can be incorporated in the packaging material. COC is amorphous, and by using it as an extruded water vapour barrier layer, curling of the packaging material is prevented.

Abstract: The invention relates to a multi-layer heat-sealable packaging material especially for food packages. In addition, objects of the invention are a food package formed of the said packaging material, a method of packaging, and the use of the material for packages. The packaging material (1) comprises a middle layer (3) of fibre material, such as cardboard; at least one polymeric protective layer (4, 5) protecting the product from going bad; and polymeric heat sealing layers (2, 7) preferably on both sides of the packaging material. According to the invention, the heat sealing layer (7) forming the inner surface of the closed package, is blended with light-absorbing pigment, such as carbon black, for protecting the product from visible light. By further blending white pigment, such as titanium dioxide, into the heat sealing layer (7), a grey tint resembling an aluminium foil has been achieved for the layer.

Abstract: The present invention relates to a laminated packaging material suitable for use especially in heat-sealable packages for liquid food, such as milk, cream and juice cartons, and to a manufacturing method of the material, and to a food package manufactured of the material. The material comprises a core of paper or cardboard, and oxygen and aroma proof barrier layers of EVOH and polyamide; it is characteristic of the invention that the EVOH layer (5) and the polyamide layer (4) are joined together directly without any intermediate adhesive layer, and that the barrier layers and the core (3) are interposed between polymeric heat-sealing layers (2, 7) on both sides of the material. The material is manufactured by extrusion so that at least the materials of the said barrier layers (4, 5) are placed against each other in a molten state and forwarded to the core (3) in one web.

Abstract: The present invention relates to a laminated packaging material suitable for use especially in heat-sealable packages for liquid food, such as milk, cream and juice cartons, and to a manufacturing method of the material, and to a food package manufactured of the material. The material comprises a core of paper or cardboard, and oxygen and aroma proof barrier layers of EVOH and polyamide; it is characteristic of the invention that the EVOH layer (5) and the polyamide layer (4) are joined together directly without any intermediate adhesive layer, and that the barrier layers and the core (3) are interposed between polymeric heat-sealing layers (2, 7) on both sides of the material. The material is manufactured by extrusion so that at least the materials of the said barrier layers (4, 5) are placed against each other in a molten state and forwarded to the core (3) in one web.