Inkjet printing apparatus and printing method

An inkjet printing apparatus that includes same-typed print heads, among which at least two print heads eject ink for a coating layer and the rest eject colored inks, wherein

• print heads ejecting ink for the coating layer are arranged in a row, and print heads ejecting ink for colored inks are arranged in the other two rows;
• print heads ejecting colored inks include heads that eject the same colored ink and heads that eject different colored inks;
• every two print heads are used to print the same colored ink;
• the print heads ejecting ink for the coating layer are interpolated or arranged abreast;
• along a printing media's motion direction, print heads ejecting the same colored ink are connected in series with a distance between the last nozzle of a print head and the first nozzle of another following the former one being the same as that between two nozzles within a print head, while print heads ejecting different colored inks are arranged abreast;
• all print heads are placed at the origin of media feeding with head nozzle lines arranged in the direction that is parallel with the media motion direction;
• a UV solidification device is installed to the left and right of the same-typed print heads;
• and
• the total width of print heads ejecting ink for coating layer and print heads ejecting colored inks is smaller than the curing width of the device.