Abstract: A web-fed rotary press (10) for printing on a web substrate (12) using heat-set inks in an offset printing process, having at least one print unit (14) and one dryer (16), and at least one additional device (18) for inputting heat into the web substrate (12) which is positioned upstream from the print unit (14), in particular. Fluting in the web-fed rotary press (10) may be minimized by supplying heat to the web substrate (12) at least at one location along the path (36) through the web-fed rotary press (10), in particular before the printing operation.

Abstract: A dryer for material webs for supplying heat to at least one side of a material web, the dryer having a dryer housing formed with an inlet opening and an outlet opening for material webs, and at least one ventilator and at least one heating device for producing heated gas, includes a burner unit shielded against the atmosphere in the dryer, and a supply system for supplying the burner unit with process gas formed of a large portion of exhaust gas of the dryer, the process gas being maintained for a dwell time and at a temperature level adequate for complete combustion of volatile solvents before it is supplied once again as heated gas to the interior of the dryer.