Abstract: The disclosure relates to a method for avoiding contamination of a printing plate given surface-covering coating of a dust-forming recording medium (e.g. an uncoated paper) with a coating substance (e.g. a primer) in an inkjet printing operation. The method can include feeding the recording medium at a feed velocity that is greater than 20 meters per minute; continuously printing of the coating substance onto the recording medium by at least one print head including a plurality of print nozzles, the coating substance being printed at a constant, predetermined applied quantity per area. A nip between the print head and the recording medium is provided such that a fluid-dynamic eddy is created between the recording medium and the print head and/or the printing plate. The disclosure also related to a printing system that is configured to implement the method.

Abstract: In a method for preventing or reducing air vortex formation between a print plate and a recording medium upon printing to the recording medium with a coating substance (e.g. primer), the recording medium is provided at a feed velocity of at least 20 meters per minute, and a plurality of print nozzles of a print head are alternately activated to print the coating substance on recording medium to cover a surface of the recording medium with the coating substance. The activation can include only activating a portion of the plurality of print nozzles simultaneously. Further, a predetermined applied quantity of the coating substance per area is constantly printed onto the recording medium.

Abstract: The disclosure relates to a method for avoiding contamination of a printing plate given surface-covering coating of a dust-forming recording medium (e.g. an uncoated paper) with a coating substance (e.g. a primer) in an inkjet printing operation. The method can include feeding the recording medium at a feed velocity that is greater than 20 meters per minute; continuously printing of the coating substance onto the recording medium by at least one print head including a plurality of print nozzles, the coating substance being printed at a constant, predetermined applied quantity per area. A nip between the print head and the recording medium is provided such that a fluid-dynamic eddy is created between the recording medium and the print head and/or the printing plate. The disclosure also related to a printing system that is configured to implement the method.

Abstract: In a method for automatic adaptation of a quantity of a coating substance, a coating substance is inkjet printed to a printing region of the recording medium; a first color is over printed across a width of the printing region of the recording medium and atop the coating substance; a print image of a second color is over printed atop the first color; the printing region having been printed to is sensory recorded; a local bleeding behavior of the first and the second colors is analyzed based on the sensory recording; and a printed quantity of the coating substance is locally adapted, based on the analysis of the local bleeding behavior, in segments of the printing region that are affected by bleeding.

Abstract: In a method for preventing or reducing air vortex formation between a print plate and a recording medium upon printing to the recording medium with a coating substance (e.g. primer), the recording medium is provided at a feed velocity of at least 20 meters per minute, and a plurality of print nozzles of a print head are alternately activated to print the coating substance on recording medium to cover a surface of the recording medium with the coating substance. The activation can include only activating a portion of the plurality of print nozzles simultaneously. Further, a predetermined applied quantity of the coating substance per area is constantly printed onto the recording medium.

Abstract: In a method for automatic adaptation of a quantity of a coating substance, a coating substance is inkjet printed to a printing region of the recording medium; a first color is over printed across a width of the printing region of the recording medium and atop the coating substance; a print image of a second color is over printed atop the first color; the printing region having been printed to is sensory recorded; a local bleeding behavior of the first and the second colors is analyzed based on the sensory recording; and a printed quantity of the coating substance is locally adapted, based on the analysis of the local bleeding behavior, in segments of the printing region that are affected by bleeding.