A method for manufacturing paper or board is disclosed and further disclosed is an internal sizing system for providing improved retention of hydrophobic internal sizing agents. The internal sizing system includes a hydrophobic internal sizing agent as a first component selected from a group consisting of alkenyl succinic anhydride (ASA), alkyl ketene dimer (AKD), rosin sizes and any combination thereof, and a water-soluble polymer product including amphoteric polyacrylamide as a second component, which amphoteric polyacrylamide has neutral or cationic net charge at pH 7, a weight-average molecular weight of 700,000-18,000,000 g/mol and a total ionicity of 4-28 mol-%, where the first component and the second component are provided as separate components or as a combination of the first component and the second component.

A method for manufacturing paper or board is disclosed and further disclosed is an internal sizing system for providing improved retention of hydrophobic internal sizing agents. The internal sizing system includes a hydrophobic internal sizing agent as a first component selected from a group consisting of alkenyl succinic anhydride (ASA), alkyl ketene dimer (AKD), rosin sizes and any combination thereof, and a water-soluble polymer product including amphoteric polyacrylamide as a second component, which amphoteric polyacrylamide has neutral or cationic net charge at pH 7, a weight-average molecular weight of 700,000-18,000,000 g/mol and a total ionicity of 4-28 mol-%, where the first component and the second component are provided as separate components or as a combination of the first component and the second component.

Methods of treating materials, such as cellulose-based materials, to provide barrier properties like water resistance and lipid resistance (OGR), separately or in combination, and particularly at high temperatures, by using bio-based coatings and/or compositions containing a water insoluble, high melting point saccharide fatty acid ester and products obtained by the methods.

Methods for manufacturing sized paper products are provided. An exemplary method includes producing a foam of water, air, a foaming agent, and a sizing agent. Further, the exemplary method includes applying the foam to a web and processing the web to form the product.

The present application relates to compostable articles and compositions including at least one biodegradable polymer and a hydrophobic agent. In some embodiments, the compostable articles and compositions include a second biodegradable polymer, different from the first biodegradable polymer. In some embodiments, the first biodegradable polymer is selected from the group consisting of polyethylene succinate) (PES), poly(trimethylene succinate) (PTS), poly(butylene succinate) (PBS), poly(butylene succinate co-butylene adipate) (PBS A), poly(butylene adipate co-terephthalate) (PBAT), poly(tetramethylene adipate-co-terephthalate) (PTAT), and thermoplastic starch. In some embodiments, the presently described articles include packaging.

A paperboard structure including a paperboard substrate having a first major side and a second major side opposed from the first major side, and a coating layer on the first major side, the coating layer includes a polymer and talc, wherein the polymer includes at least one of poly(butylene succinate) and poly(butylene succinate-co-adipate).

The present invention relates generally to biocomposite materials made of cellulose and wheat bran and/or oat husk, prepared by methods comprising mixing the husk or bran with an aqueous alkaline solution, stirring and/or homogenizing the mixture, admixing with cellulose pulp and thermoforming the material under conditions admitting curing, thereby obtaining improvements in strength measured as at least one of strain at peak (%), stress at peak (%) and Young's modulus (MPa).

A manufacturing method of a paper, board or the like having a grammage in a range of 125-600 g/m.sup.2, preferably 150-210 g/m.sup.2, including adding a paper sizing agent including maleated vegetable oil and an alkenyl succinic anhydride (ASA) to a fibre stock including at least 80 weight-% of recycled fibre material and having calcium concentration of at least 500 mg/l, expressed as CaO.

A corrugated fiberboard comprising cellulosic fibers, wherein said corrugated fiberboard has at least one of a geometrical tensile index in the range of from 32 to 65 Nm/g, a fracture toughness index in the range of from 4 to 24 Jm/kg, and a ring crush index in the range of from 5 to 10 Nm/g5 measured at relative humidity of 85% RH; wherein the cellulosic fibers comprises a mixture of less refined fibers having a Schopper-Riegler (SR) value in the range of 15 to 28 and microfibrillated cellulose fibers, wherein mixture comprises said microfibrillated cellulose in a range of from 1% to 5% by weight of the dry content of the cellulosic fibers.

A corrugated fiberboard comprising cellulosic fibers, wherein said corrugated fiberboard has at least one of a geometrical tensile index in the range of from 32 to 65 Nm/g, a fracture toughness index in the range of from 4 to 24 Jm/kg, and a ring crush index in the range of from 5 to 10 Nm/g5 measured at relative humidity of 85% RH; wherein the cellulosic fibers comprises a mixture of less refined fibers having a Schopper-Riegler (SR) value in the range of 15 to 28 and microfibrillated cellulose fibers, wherein mixture comprises said microfibrillated cellulose in a range of from 1% to 5% by weight of the dry content of the cellulosic fibers.