A method for manufacture of paper or board, in which method an inverted solution of cationic polymer is added to the fiber suspension for providing retention enhancement without over-flocculating fiber stock and destruction sheet formation and/or improving drainage and enhancing or at least maintaining strength of paper or board, An inverted solution has a bulk viscosity of 50-150 mPas at 0.2 weight-% cationic polymer concentration and inverted solution comprises cationic polymer obtained by reverse phase emulsion polymerization of a monomer blend comprising non-ionic monomers, 15-50 mol-% cationic monomers, an optionally at most 50 ppm of a crosslinking agent, and a chain transfer agent, and the obtained reverse phase emulsion of cationic polymer is inverted into an aqueous solution.

A method for manufacture of paper or board, in which method an inverted solution of cationic polymer is added to the fiber suspension for providing retention enhancement without over-flocculating fiber stock and destruction sheet formation and/or improving drainage and enhancing or at least maintaining strength of paper or board, An inverted solution has a bulk viscosity of 50-150 mPas at 0.2 weight-% cationic polymer concentration and inverted solution comprises cationic polymer obtained by reverse phase emulsion polymerization of a monomer blend comprising non-ionic monomers, 15-50 mol-% cationic monomers, an optionally at most 50 ppm of a crosslinking agent, and a chain transfer agent, and the obtained reverse phase emulsion of cationic polymer is inverted into an aqueous solution.

The present invention provides a process for producing paper or board, comprising slushing a stock of dried fibres in a slushing system comprising a pulper, and/or feeding a stock of never-dried fibres in a fiber line of an integrated paper mill; deflaking and/or refining the stock in a deflaker and/or a refiner, optionally diluting the deflaked and/or refined stock, directing the deflaked and/or refined stock to a headbox, forming a web, and drying the web, wherein a polymeric paper making additive is added to one or more of the stocks of dried fibres and never-dried fibres before deflaking and/or refining of the stock. The present invention further provides paper and board with improved properties.

A method for manufacture of paper or board, in which method an inverted solution of cationic polymer is added to the fiber suspension for providing retention enhancement without over-flocculating fiber stock and destruction sheet formation and/or improving drainage and enhancing or at least maintaining strength of paper or board, An inverted solution has a bulk viscosity of 50-150 mPas at 0.2 weight-% cationic polymer concentration and inverted solution comprises cationic polymer obtained by reverse phase emulsion polymerization of a monomer blend comprising non-ionic monomers, 15-50 mol-% cationic monomers, an optionally at most 50 ppm of a crosslinking agent, and a chain transfer agent, and the obtained reverse phase emulsion of cationic polymer is inverted into an aqueous solution.

A method for manufacture of paper or board, in which method an inverted solution of cationic polymer is added to the fiber suspension for providing retention enhancement without over-flocculating fiber stock and destruction sheet formation and/or improving drainage and enhancing or at least maintaining strength of paper or board, An inverted solution has a bulk viscosity of 50-150 mPas at 0.2 weight-% cationic polymer concentration and inverted solution comprises cationic polymer obtained by reverse phase emulsion polymerization of a monomer blend comprising non-ionic monomers, 15-50 mol-% cationic monomers, an optionally at most 50 ppm of a crosslinking agent, and a chain transfer agent, and the obtained reverse phase emulsion of cationic polymer is inverted into an aqueous solution.

A method of manufacturing a toilet paper includes: adding, to a paper material including a leaf bleached kraft pulp and a needle bleached kraft pulp whose mass % is 15 to 55 mass %, as fiber materials, 0.08 to 0.15 mass %, with respect to a mass of the pulps, of a fatty acid ester series compound whose particle size is less than or equal to 0.1 m, and 0.05 to 0.15 mass %, with respect to the mass of the pulps, of a fatty acid amide series compound whose particle size is 0.5 to 5 m in this order, to make a paper of a paper material in which the fatty acid ester series compound and the fatty acid amide series compound are added.

A method of manufacturing a toilet paper includes: adding, to a paper material including a leaf bleached kraft pulp and a needle bleached kraft pulp whose mass % is 15 to 55 mass %, as fiber materials, 0.08 to 0.15 mass %, with respect to a mass of the pulps, of a fatty acid ester series compound whose particle size is less than or equal to 0.1 m, and 0.05 to 0.15 mass %, with respect to the mass of the pulps, of a fatty acid amide series compound whose particle size is 0.5 to 5 m in this order, to make a paper of a paper material in which the fatty acid ester series compound and the fatty acid amide series compound are added.

A 1-ply toilet paper includes a leaf bleached kraft pulp and a needle bleached kraft pulp, as constituting fibers, mass % of the needle bleached kraft pulp being 15 to 55 mass %; 0.024 to 0.075 mass %, with respect to a mass of the pulps, of a fatty acid ester series compound; and 0.015 to 0.075 mass %, with respect to the mass of the pulps, of a fatty acid amide series compound, wherein a basis weight is 21.0 to 22.5 g/m.sup.2, wherein a paper thickness is 110 to 155 m, wherein a degree of elongation is 14 to 25%, wherein an MMD is less than 9.3, wherein dry tensile strength in a longitudinal direction is 245 to 330 cN/25 mm, and wherein dry tensile strength in a lateral direction is 85 to 135 cN/25 mm.

A 1-ply toilet paper includes a leaf bleached kraft pulp and a needle bleached kraft pulp, as constituting fibers, mass % of the needle bleached kraft pulp being 15 to 55 mass %; 0.024 to 0.075 mass %, with respect to a mass of the pulps, of a fatty acid ester series compound; and 0.015 to 0.075 mass %, with respect to the mass of the pulps, of a fatty acid amide series compound, wherein a basis weight is 21.0 to 22.5 g/m.sup.2, wherein a paper thickness is 110 to 155 m, wherein a degree of elongation is 14 to 25%, wherein an MMD is less than 9.3, wherein dry tensile strength in a longitudinal direction is 245 to 330 cN/25 mm, and wherein dry tensile strength in a lateral direction is 85 to 135 cN/25 mm.

A method of manufacturing a toilet paper includes: adding, to a paper material including a leaf bleached kraft pulp and a needle bleached kraft pulp whose mass % is 15 to 55 mass %, as fiber materials, 0.08 to 0.15 mass %, with respect to a mass of the pulps, of a fatty acid ester series compound whose particle size is less than or equal to 0.1 m, and 0.05 to 0.15 mass %, with respect to the mass of the pulps, of a fatty acid amide series compound whose particle size is 0.5 to 5 m in this order, to make a paper of a paper material in which the fatty acid ester series compound and the fatty acid amide series compound are added.