To provide an apparatus and a method for processing a sheet in an apparatus heating, cooling and drying the sheet by air coming from air blowing openings which are not continuous along the direction of a sheet width, which is capable of obtaining the sheet having even properties along the direction of the sheet width by effectively decreasing the unevenness of heat transfer along the direction of the sheet width.

In the apparatus heating, cooling and drying the sheet being unidirectionally transferred by air coming from the air blowing openings which are not continuous along the direction of the sheet width, the positions of the air blowing openings of each nozzle are shifted in the direction of the sheet width.