To release an ink droplet, the nozzle is heated by electricity. The heat causes the ink to expand in a bubble, and it expands through the nozzle until it squirts onto the paper.4. When the ink bubble collapses, a vacuum is created that draws more ink into the nozzle from the ink cartridge, ready to release the next droplet.5. It takes many droplets to form a single character.The nozzles are attached to a printhead, which can move left and right across the paper to create new characters. http://www.opmprinter.com/printer/