Most consumer inkjet printers use a thermal inkjet.In this method inside each partition of the ink resevoir there is a heating element with a tiny metal plate.According to the signal from the printer a small amount of current flows through the metal resistor and warms it.The ink around the heat plate immediately vapourised into a tiny air bubble inside the nozzle.As a result a tiny drop of ink is forced out of the catridge nozzle into the paper.This process will take only milliseconds time to take place. http://www.cheaprefills.info