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.