Method and device for drying paper

A dryer for paper, comprising

• a flow-through cylinder over which a paper web runs in a running direction, said cylinder comprising an inner mantle and an outer mantle arranged above said inner mantle in a radial direction of said cylinder, said outer mantle having ducts and providing an outer mantle surface of said cylinder, said inner mantle comprising through perforations having outer parts which open into said outer mantle,
• means for passing a cooling medium through said inner mantle, said means comprising a system of ducts arranged within said inner mantle,
• a blowing-on hood arranged above said cylinder, said hood comprising a nozzle arrangement by whose means a set of drying-gas jets is applied to an outer face of the paper web to evaporate water in the web, and
• means for providing negative pressure in an interior of said cylinder to draw a part of the evaporated water toward said mantle surface such that the evaporated water condenses on said mantle surface, the evaporated water being drawn from said mantle surface through said perforations over the entire circumference of said cylinder to continuously seal said perforations and maintain the negative pressure in the interior of said cylinder.