INKJET PRINTING METHOD AND INKJET PRINTING APPARATUS

摘要

A controller controls printing heads to print a page information mark with black ink to perform line flushing. The printing heads each have a plurality of inkjet nozzles for discharging ink being disposed in parallel in a width direction of web paper. Upon printing the mark, when an overlap region is present in which a mark printable region overlaps a line flushing region with ink other than the black ink, the controller performs control to decrease an ink discharge amount per unit area in the overlap region in the mark printable region to be smaller than that in the mark printable region except for the overlap region and the line flushing region. This causes a decreased total ink discharge amount in the overlap region.

主权项

1. An inkjet printing method of printing an image by controlling printing heads with a controller to discharge ink to a print medium to be transported, the printing heads having a plurality of inkjet nozzles for discharging the ink being disposed in parallel in a width direction intersecting a transportation direction of the print medium, the inkjet printing method comprising:
a mark printing step of printing a page information mark onto the print medium with pre-set color ink, the page information mark representing page information on the print medium; and a line flushing step of performing line flushing to the print medium in which all of the inkjet nozzles associated with printing of the image discharge the ink individually along with the mark printing step of printing the page information mark, wherein upon printing of the page information mark, when an overlap region is present in which a printable region of the page information mark with the pre-set color ink overlaps a line flushing region with ink other than the pre-set color ink, the mark printing step comprises a decreasing step of decreasing an ink discharge amount per unit area in the overlap region in the printable region of the page information mark to be smaller than that in the printable region of the page information mark except for the overlap region and the line flushing region.