Inkjet Batch Coding Machine Thermal Inkjet Printer use print cartridges with a series of tiny electrically heated chambers Constructed by photo lithography. To produce an image the printer runs a pulse of current through the heating elements causing a steam explosion in the chamber to form a vapor bubble, which propels a droplet of ink out of the nozzle placing them precisely on a surface to form text, bar codes or graphics on to the substrate. The ink surface tension as well as the condensation and thus contraction of the vapour bubble, puts a further charge of ink to the chamber through a narrow channel attached to an ink reservoir. The refill is ready to fire again in less than 100 millionths of a second. Thermal Inkjet Printer is compact Controller & Printer in one solution ideal for repeat printing jobs.