Disclosed is a process for depositing marking material onto a substrate
which comprises (a) providing a propellant to a printhead, said printhead
having defined therein at least one channel, each channel having an inner
surface and an exit orifice with a width no larger than about 250 microns
through which the propellant can flow, said propellant flowing through
each channel, thereby forming a propellant stream having kinetic energy,
each channel directing the propellant stream toward the substrate, the
inner surface of each channel having thereon a conductive polymer coating;
and (b) controllably introducing a particulate marking material into the
propellant stream in each channel, wherein the kinetic energy of the
propellant stream causes the particulate marking material to impact the
substrate.
