Abstract: The present invention relates to a water-resistant fibrous material, such as flexible sheet, paper or paperboard, comprising a foam-formed fibrous ply, wherein said foam-formed fibrous ply has been subjected to grafting with a fatty acid halide to render the foam-formed fibrous ply water-resistant. The present invention further relates to a method for manufacturing the water-resistant fibrous material.

Abstract: The present invention relates to a water-resistant mineral-coated cellulose-based substrate, comprising a cellulose-based substrate, and a mineral-coating layer disposed on at least one surface of said substrate, said mineral coating comprising 50-95 wt % of a particulate mineral and 5-50 wt % of a water-dispersible binder based on the total dry weight of the mineral coating, and wherein said mineral-coating layer has been subjected to grafting with a fatty acid halide. The invention further relates to a method for manufacturing the water-resistant mineral-coated cellulose-based substrate.

Abstract: The present invention relates to a multilayered cellulose-based substrate, comprising a cellulose-based first layer, and a cellulose-based second layer in contact with said first layer, wherein said substrate has a basis weight above 85 g/m2, wherein said first layer comprises an internal sizing agent, and wherein said second layer has been subjected to grafting with a fatty acid halide through the entire thickness of said second layer. The invention further relates to a method for manufacturing the multilayered cellulose-based substrate.

Abstract: The present invention relates to a paper or paperboard substrate having barrier properties, which substrate comprises a single or multiply structure with e.g. a top ply, a middle ply and a bottom ply, wherein at least one of said top ply and said bottom ply is provided with a high-density bio-barrier layer, and wherein said top or bottom ply provided with the high-density bio-barrier layer and said top or bottom ply not provided with the high-density bio-barrier layer have both been subjected to grafting with a fatty acid halide.

Abstract: The present invention relates to a method for hydrophobizing a cellulose substrate (1), which comprising a first side and a second side, which faces away from the first side, the method comprising the steps of: —drying the cellulose substrate to a dry content above 80%, preferably above 85%; —providing a fatty acid halide in spray form; —converting said fatty acid halide in spray form into vaporized fatty acid halide; and —guiding said vaporized fatty acid halide to contact the first side of the cellulose substrate, and at least partially penetrate the cellulose substrate.

Abstract: The present invention relates to a method for hydrophobizing a cellulose substrate, which comprises a first side and a second side, which faces away from the first side, wherein the method comprising the steps of:—drying the cellulose substrate to a dry content above 80%, preferably above 85%;—providing a fatty acid halide in spray form; and—guiding said fatty acid halide in spray form to contact the first side of the cellulose substrate, and at least partially penetrate the cellulose substrate.

Abstract: Method for predicting properties of a product of cellulose-fibre-based pulp, paper or paperboard, wherein a suspension of cellulose fibre is subjected to analysis, during manufacture of the product, by spectroscopic measurements of a sample quantity of the suspension, in a spectrum in the wavelength range 200–2500 nm. The method comprises diluting each sample quantity prior to analysis, dewatering and drying one partial flow and subjecting that partial flow to spectroscopic measurements, and analyzing a second partial flow of the diluted sample quantity for physical fiber data, by means of image analysis. Each sample quantity analyzed generates at least 100 data points from the spectroscopic measurement distributed in the selected spectrum, and at least 50 data points with regard to the physical fibre data, in the form of one or more physical fibre property distributions with regard to at least one physical property selected from fibre length, fibre width and fibre shape.