Stora Enso Oyj

Enso Oy

Risto Salminen

Tapani Penttinen

Matti Salste

Tuomo Kuuppo

Jalliina Järvinen

Yrj&ouml; Aho

Terttu Heinonen N&eacute;e Maatt&auml;

Terttu Heinonen

Jalliina J&auml;rvinen

Bruce Foster

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. The EVOH layer and the polyamide layer are joined together directly without any intermediate adhesive layer, and the barrier layers and the core are interposed between polymeric heat-sealing layers on both sides of the material. The material is manufactured by extrusion so that at least the materials of the said barrier layers are placed against each other in a molten state and forwarded to the core in one web.

Laminated package material, method for manufacturing the same, and a package

The invention relates to a coated food paperboard ( ), to the manufacturing process and use of the same, and to products obtained thereof. The paperboard ( ) comprises one or several fibre material layers ( ), such as a three-layer structure consisting of a middle layer ( ) of a mixture of sulphate pulp and CTMP and of sulphate pulp layers ( ) on both sides of it, and of a polymeric coating ( ) getting into contact with food, either on one side or on both sides of the paperboard. According to the invention, the coating ( ) consists of an outer layer ( ), the melting point of the polymer used in which is at least 230&deg; C., and of an inner layer ( ) placed against the fibre material layer ( ); in this inner layer, a polymer with a melting point of at least 230&deg; C. is blended with another adhesive polymer, the melting point of which is 130-185&deg; C. Further, the inner layer ( ) may be provided with mineral substance, such as calcium carbonate. In accordance with the invention, the paperboard ( ) is manufactured by coextrusion of superimposed polymeric layers ( ). The paperboard ( ) of the invention is suitable for liquid packaging or oven board, and products manufactured of the paperboard comprise especially oven dishes and consumer packages for food, which include the dish and which may be heated as such.

Coated paperboard process for manufacturing the same and products obtained thereof

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 ( ) and the polyamide layer ( ) are joined together directly without any intermediate adhesive layer, and that the barrier layers and the core ( ) are interposed between polymeric heat-sealing layers ( ) on both sides of the material. The material is manufactured by extrusion so that at least the materials of the said barrier layers ( ) are placed against each other in a molten state and forwarded to the core ( ) in one web.

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Karhula, Finland

Risto Salminen