Roller dryer, modular, for the drying of the screen-printing and roller coating enamels, normally installed in line with the printing machines like Deco-glass and/or coating machines like Rainbow, available in different useful widths, depending on the maximum width of the glass sheets to be processed. The heating system is based on convection by recirculation of hot air, while the cooling can be implemented by ventilation with ambient air and/or ventilation with refrigerated air. The desired configuration of the dryer is obtained by a proper combination of heating modules and cooling modules.