Printing press having an infrared dryer unit

Printing machines are fitted with a printer assembly for application of solvent-containing printing ink onto a printing substrate. A transport device transports the printing substrate from the printer assembly to a dryer unit that has at least one infrared radiator for drying the printing substrate. The dryer unit is improved in terms of homogeneity and rapidity of the drying of solvent-containing printing ink, and in that no active cooling of the infrared radiator is required. The infrared radiator is a planar heating element made of a dielectric, emits infrared radiation when heated, and comprises a heating surface that faces the printing substrate to be dried. The infrared radiator has a contacting surface, onto which a printed conductor of a heating conductor made of an electrically conductive precious metal-containing resistor material is applied, that is connected to an adjustable current source by an electrical contact.