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AssigneeStora Enso OYJ
InventorsYrjö Aho, Tapani Penttinen, Risto Salminen, Bruce Foster
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The invention relates to a coated food paperboard (1), to the manufacturing process and use of the same, and to products obtained thereof. The paperboard (1) comprises one or several fibre material layers (2), such as a three-layer structure consisting of a middle layer (4) of a mixture of sulphate pulp and CTMP and of sulphate pulp layers (5) on both sides of it, and of a polymeric coating (3) getting into contact with food, either on one side or on both sides of the paperboard. According to the invention, the coating (3) consists of an outer layer (6), the melting point of the polymer used in which is at least 230° C., and of an inner layer (7) placed against the fibre material layer (5); in this inner layer, a polymer with a melting point of at least 230° C. is blended with another adhesive polymer, the melting point of which is 130-185° C. Further, the inner layer (7) may be provided with mineral substance, such as calcium carbonate. In accordance with the invention, the paperboard (1) is manufactured by coextrusion of superimposed polymeric layers (6, 7). The paperboard (1) 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.
A coated food paperboard comprising one or several fiber material layers and a heat-resistant polymeric coating getting into contact with food, said coating consisting of superimposed polymeric layers comprising an outer layer, the melting point of the polymer of which is at least 230° C., and an inner layer placed against the fiber material layer, to achieve adhesion between the coating and the fiber material, characterized in that the inner layer comprises a first polymer with a melting point of at least 230° C., blended with a second polymer which is an adhesive polymer with a melting point of 130-185° C. in a ratio of 85-97% by weight of said first polymer and 3-15% by weight of said second polymer.
A coated food paperboard comprising one or more fiber material layers and a heat-resistant polymeric coating for contacting food, said heat-resistant polymeric coating comprising superimposed polymeric layers comprising an outer polymeric layer for contacting food, wherein the melting point of the polymer of the outer polymeric layer is at least 230° C., and an inner adhesive layer in direct contact with the outer layer and placed against the fiber material layer in order to achieve adhesion between the coating and the fiber material, characterized in that the inner layer comprises a first polymer with a melting point of at least 230° C., blended with a second polymer which is an adhesive polymer with a melting point of 130-185° C. in a ratio of 85-97% by weight of said first polymer and 3-15% by weight of said second polymer.
Dependencies are inferred from the claim text.