subject: Mesh Belt Dryer Cylinders [print this page] Accordingly, the present invention is directed to a dryer section of a machine to manufacture a material sheet. The mesh belt dryer section may include at least one dryer cylinder, a plurality of sheet guide rolls, a transport belt for guiding the material sheet in a meandering manner around the at least one dryer cylinder and the plurality of sheet guide rolls, and threads surrounding at least one of the at least one dryer cylinder and the plurality of sheet guide rolls. The threads may be positioned between the material sheet and a surface of the at least one of the at least one dryer cylinder and the plurality of sheet guide rolls.
Thus, it is possible to transfer the material sheet 19 without direct contact between the circumferential surfaces of the mesh belt dryer cylinders and sheet guide rolls, in single- as well as in double-row dryer sections. This basic principle can of course be upheld in subsequent treatment stations of a paper-producing machine, for example in coating units in which one or both surfaces of the material sheet receive a coating. It should be assumed that in the dryer section in particular, the material sheet 19 will be guided in a meandering manner around the dryer cylinders and/or sheet guide rolls with the assistance of transport belts, also called dryer-screens or -felts. For purposes of clarity, these transport belts are not displayed in the Figures.
From the above it will become evident that not all mesh belt dryer cylinders and/or sheet guide rolls must be surrounded by threads or screens of the type described. It is very possible that dryer cylinders and sheet guide rolls which are surrounded by threads or screens follow the usual sort of dryer cylinders and sheet guide rolls without threads and/or screens. It is thus possible to limit construction expenses to that area of the dryer section in which the removal of the material sheet from the dryer cylinders and sheet guide rolls is possible even without using threads and screens due to the given sheet characteristics.
