Abstract: The invention relates to a drying cylinder which is used to dry a paper, cardboard, tissue or other web of fibrous material in a machine for the production and/or for the transformation thereof. The drying cylinder includes a support body and an external cover layer which is heated by a hot fluid. The thermal flow passing through the external cover layer is increased such that at least one cavity is provided between the support body and the external cover layer through which the fluid flows. The external cover layer is predominately so thin that the ratio formed by the thermal conductivity of the material and the thickness of the external cover layer is greater than a threshold value of 3.2 kW/m2K for steel, 30 kW/m2K for aluminum, 18 kW/m2K for bronze alloys, 3.4 kW/m2K for copper and 6.1 kW/m2K for magnesium.

Abstract: The invention relates to a device and a method for producing and/or transforming a web of fibrous material, in particular a paper or cardboard web. Said device includes a heatable and rotatable cylinder, in particular a drying cylinder of a drying section, and a cylinder sleeve which can be impinged from the inside by a heating fluid. In order to improve the heating power below the external surface of the cylinder sleeve, at least one channel is provided in order to guide the heating fluid.

Abstract: The invention relates to a drying cylinder which is used to dry a paper, cardboard, tissue or other web of fibrous material in a machine for the production and/or for the transformation thereof. The drying cylinder includes a support body and an external cover layer which is heated by a hot fluid. The thermal flow passing through the external cover layer is increased such that at least one cavity is provided between the support body and the external cover layer through which the fluid flows. The external cover layer is predominately so thin that the ratio formed by the thermal conductivity of the material and the thickness of the external cover layer is greater than a threshold value of 3.2 kW/m2K for steel, 30 kW/m2K for aluminum, 18 kW/m2K for bronze alloys, 3.4 kW/m2K for copper and 6.1 kW/m2K for magnesium.

Abstract: The invention relates to a device for producing and/or transforming a web of fibrous material, in particular a paper cardboard web. Said device includes a heatable and rotatable cylinder, in particular a dry cylinder of a dry part, including a cylinder sleeve which can be impinged upon from the inside by a heating fluid. At least one channel is provided in order to guide the heating fluid such that the heating capacity can be improved and the production below the external surface of the cylinder cover can be simplified. The dry cylinder is at least partially modular.

Abstract: Disclosed is a heated cylinder (1) for heating a paper web, cardboard web, tissue web, or another fiber web in a machine used for producing and/or refining the fiber web. Said heated cylinder (1) comprises a cylinder sleeve which is impinged upon at least in part from the inside by a hot fluid and is provided with at least one inner and an outer sleeve layer (5, 6). The inventive heated cylinder (1) is characterized in that the two sleeve layers (5, 6) are separated from each other by a hollow space into which the fluid can be introduced.

Abstract: A dryer section for drying a moving material web, specifically a paper or cardboard web, including several dryer groups that are located successively in the direction of web travel, whereby at least one of these is a double row configuration and whereby the material web is continuously supported in at least one transitional zone from a single row dryer group to an immediately following double row dryer group and/or in a transitional zone between two double row dryer groups that are located immediately following each other.

Abstract: A dryer section for drying a moving material web, specifically a paper or cardboard web, including several dryer groups that are located successively in the direction of web travel, whereby at least one of these is a double row configuration and whereby the material web is continuously supported in at least one transitional zone from a single row dryer group to an immediately following double row dryer group and/or in a transitional zone between two double row dryer groups that are located immediately following each other.