Patent ID: 8789925

Claim:
A method of operating an inkjet printer comprising: moving a print medium through a print zone in a process direction; ejecting a plurality of drops of a magnetic ink from a plurality of inkjet_ nozzles in the print zone onto a surface of the print medium; moving the print medium past an electromagnet located in the process direction from the plurality of inkjet nozzles in the print zone; applying a magnetic field with an orientation that is substantially parallel to the process direction to the plurality of drops of the magnetic ink on the surface of the print medium with the electromagnet to increase a viscosity of the magnetic ink on the print medium in a direction that is perpendicular to the process direction extending into the print medium; activating the electromagnet with a controller prior to moving the print medium past the electromagnet; and deactivating the electromagnet with the controller after applying the magnetic field to the plurality of drops of the magnetic ink on the surface of the print medium.