Abstract:
A sheet processing machine, in particular a sheet-fed printing press, includes a varnishing unit and at least one combination drier for applying radiation energy and heated air to a newly varnished sheet. The at least one combination drier includes a plurality of circular or polygonal air nozzles and narrow-band high-power infrared light sources disposed between the air nozzles. The infrared light sources apply radiation at a radiation density of at least 25 kW/m2 in total to the varnished sheet. The temperature of the heated air passing through the nozzles is below 100° C., preferably below 80° C. A method of drying sheets is also provided.
Abstract:
A sheet-processing machine includes at least one dryer, air feed devices for the dryers, at least one air extraction device for heated exhaust air and a mixing device for mixing warm dryer exhaust air with the dryer feed air. An open loop or closed loop control device controls or regulates an extent to which the dryer exhaust air is mixed with the dryer feed air by using measured variables or setting values which are correlated with the moisture content of the exhaust air. A method for drying printed and/or varnished sheets is also provided.