Patent ID: 8333149

Claim:
Drying equipment for printing machines comprising: an oven configured and operable to dry solvent on a printed support travelling through said oven, said oven having passages through which false air can enter said oven from the outside; a drying air supply fan and a heat exchanger, for supplying heated air to said oven, a measuring device for measuring solvent concentration inside said oven, a recirculation device connected to said oven through a drying air exhaust duct, said recirculation device being configured and operable to either supply drying air exhausted from said oven to said drying air supply fan and said heat exchanger or to exhaust such drying air exhausted from said oven, based on whether said solvent concentration is higher or lower than a predefined threshold, respectively, at least one false air suppression device which covers at least one of said oven passages and which is configured and operable to be maintained at a pressure lower than air pressure inside said oven preventing false air from entering said oven through said at least one passage; a common recirculation duct to which said false air suppression device is connected; and a recirculated air duct connecting said common recirculation duct to said oven and configured and operable for supplying drying air to said oven.