Ink jet printing apparatus and process

An ink jet printing process, comprising the steps of:

• preparing a source of pressurized water-based ink, said ink comprising 60 to 95 percent by weight water, 0.05 to 25 percent by weight dye, and 2.5 to 20 percent by weight of a mixture of butyl cellosolve and butyl carbitol;
• connecting said ink source to a plurality of solenoid valves, each of said solenoid valves having an input port in communication with said ink source and an output port;
• connecting said output ports of said solenoid valves to a plurality of jeweled orifice nozzles;
• and
• providing a control means for controlling the output of said solenoid valves to said nozzles.

An ink jet printing process, comprising the steps of:

• preparing a source of pressurized water-based ink, said ink comprising 60 to 95 percent by weight water, 0.05 to 25 percent by weight dye, 2 to 8 percent by weight butyl cellosolve, and 2 to 8 percent by weight butyl carbitol;
• connecting said ink source to a plurality of solenoid valves, each of said solenoid valves having an input port in communication with said ink source and an output port;
• connecting said output ports of said solenoid valves to a plurality of jeweled orifice nozzles, said nozzle orifices being in the range of 0.145 mm to 0.185 mm in diameter;
• and
• providing a control means for controlling the output of said solenoid valves to said nozzles.