Surface Treatment Of Nozzles For Ink Jet Printers
Original Publication Date: 1979-Oct-01
Included in the Prior Art Database: 2005-Feb-20
When ink is present on the face of an ink jet nozzle with the stream shut off, the ink tends to spread out on the surface if the surface energy of the nozzle is higher than that of the ink. Alternatively, if the surface energy of the nozzle is lower than that of the liquid, the liquid tends to bead up on the nozzle face, and surface tension causes ink beads to back up into the orifice of the nozzle. Nozzles made of stainless steel have a higher surface energy than that of ink; thus if the ink is left on the nozzle surface after a stream shut-down, it tends to spread out.