System for keeping the printing plates of a printing press at a moderate temperature

A system for keeping cylinders of a printing press at a moderate temperature, with blast-air cooling equipment, which comprises at least one heat exchanger, through which cooling liquid flows and which has a heat exchanger air inlet and a heat exchanger air outlet, and at least one blower, which drives air from the heat exchanger air inlet through the heat exchanger to the heat exchanger air outlet and from the heat exchanger air outlet as cold air onto the surface of a rotating cylinder of a printing press, characterized in that an air recirculation cycle is formed, in which the heat exchanger, the blower, and at least one air return duct are located, through which a first portion of the cold air, blown onto the surface, subsequently is guided back from this surface to the air inlet of the heat exchanger where the first portion of the air, which has been guided back, is mixed with fresh air, which has been aspirated by the blower and, together with the fresh air, is blown once again through the heat exchanger onto the surface.