Abstract: The invention relates to a method for improving papermaking or board making process. The method comprises forming a fibre stock, and leading the fibre stock to a headbox and feeding it to a wire to form a wet fibrous web. A at least one polysaccharide having 1,4-?-anomeric configuration in linkages between saccharide units of the polysaccharide backbone or the main polysaccharide backbone is applied to the fibre stock after machine chest or on the wet fibrous web. The invention relates also to paper made by the method and to the use of polysaccharide.

Abstract: The present invention relates to a modified fibrous product and a method of producing the same. According to the method, transparent areas are generated in the fibrous product, such as in a paper or a cardboard sheet or in a paper or a cardboard web. According to the present invention, a carbohydrate derivative that includes a plasticizer is incorporated into the fibrous product, and the carbohydrate derivative, which is plasticized with the plasticizer, is brought, in a liquid state and under pressure, to migrate in between the fibres of the product in such a way that at least part of the plasticizer penetrates into the lumens of the fibres, in which case the fibrous product becomes transparent in the treated area. By using the solution, it is possible to simplify the method of further processing paper or cardboard for consumer packages. The present invention can be applied to, among other products, envelopes having a window through which the address is visible.

Abstract: A method for managing the water sorption of a board by layered sizing is provided, such that the sizing of a central layer is effected with a hydrophobic and fast-curing adhesive, and the surface sizing in preparation for calendering is effected with an adhesive which is hydrophilic during its curing period, such that, during a surface wetting process, water sorption occurs substantially only into a topliner.

Abstract: A method and an assembly is disclosed for manufacturing a web of glazed paper or board so as to produce with a web surface treated with a treatment agent, the method comprising the steps of first producing a base web (10), whereupon in an applicator apparatus to the surface of the web is applied in at least one step at least one kind of a treatment agent. Subsequent to the application of the treatment agent, the web (10) is passed via a dryer. The solids content of the treatment agent to be applied the surface of the web (10) in an applicator apparatus is not less than 80 %, and after the application of the treatment agent, the web (10) is passed via a belt dryer comprising at least one heatable belt (2) in such a manner that the heatable belt comes to face the treated surface of the web (10). Advantageously, the web has a high moisture content prior to the application of the treatment agent.

Abstract: The invention relates to a method and arrangement for moistening a substantially dry fiber web and subjecting the moistened web to heat and compression.

Abstract: An apparatus for drying and smoothing a fibre web between two tight bands that move in parallel and run around turning rolls, the first band being heated with hot steam and the second band being cooled with water, and the fibre web being conducted through the drying zone that the bands define together with at least one felt or wire such that the fibre web is in contact with the surface of the first, heated band and that the felt or wire is between the fibre web and the second, cooled band. The apparatus and method further comprise spreading the fibre web in its transverse direction before it is led into the drying apparatus.

Abstract: An apparatus for drying a fiber web, in which apparatus the fiber web (5) is dried between two tight bands (1, 2) moving in the same direction and turning around turning rolls (6a, 6b, 7a, 7b). The first band (1) is heated by means of a pressure chamber (9) and the second band (2) is cooled by means of a water chamber (10). The fiber web (5) is led together with at least one felt or wire (3, 4) through a drying zone defined by the bands (1, 2) in such a way that the fiber web is in contact with the surface of the first band (1) and the felt or wire (3, 4) is between the fiber web (5) and the second band (2). At least one band (1, 2) is guided by a shoe (11a, 11b) in such a way that the fiber web substantially immediately upon coming into contact with the first band (1) is exposed to the effect of the compression pressure of the pressure chamber (9).

Abstract: The invention relates to a method of and an apparatus for drying a fiber web, whereby the fiber web (5) is dried in a cylinder drying unit (12) and in a band drier unit (11). The cylinder drying unit (12) and the band drier unit (11) are arranged one above the other. A considerable space saving is then achieved and the building costs remain rather moderate. Simultaneously, a remarkable addition to the drying capacity is achievable by moderate investments by means of existing apparatuses, for instance. (FIG.

Abstract: The invention relates to a method of and an apparatus for drying a fiber web, whereby the fiber web is dried in a cylinder drying unit (12) and in a band drier unit (11). The fiber web (5) is led from the cylinder drying unit (12) to the band drier unit (11) in such a way that it is easy to determine a desired dry content for the fiber web (5) in the cylinder drying unit (12) when the fiber web (5) is transferred to the band drier unit (11).

Abstract: The invention relates to an apparatus for drying a fiber web, in which apparatus the fiber web (5) is dried between two tight bands (1, 2) moving in the same direction and turning around turning rolls (6a, 6b, 7a, 7b). The first band (1) is heated by means of a pressure chamber (9) and the second band (2) is cooled by means of a water chamber (10). The fiber web (5) is led together with at least one felt or wire (3, 4) through a drying zone formed by the bands (1, 2) in such a way that the fiber web is in contact with the surface of the first band (1) and the felt or wire (3, 4) is between the fiber web (5) and the cooled second band (2). The surface (11) of the first band (1) bearing against the fiber web (5) is at least partially formed in such a way that reflection from it to a specular reflection angle is reduced substantially. Excessive gloss can then be removed from the surface of the fiber web (5) and the end product to be manufactured of it.