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One of the replaceable components of the printer, the printer cartridges contain ink that is normally spread on the paper on which the text or graphics are printed. Sometimes the cartridge includes the print head in addition to the ink. When the user clicks on the "print" command, the printer comes into action and the ink is passed through small holes on the print head and spreads on the paper creating the impressions of texts, graphics, or images. Components of such cartridges are portioned ink reservoir that could be one or more. Sometimes the manufacturer adds electronic contacts and chip to the machine that communicates with the printer. The chip is located inside the cartridge and it electronically contacts the printer to perform the given task. Many branded companies today create inkjet printers and their cartridges. They include HP, Canon, and Lexmark and these branded companies use thermal inkjets. There is a heating element inside each partition of the ink reservoir using tiny metal plates or resistors. When the signal is given by the printer, a tiny current will flow through the metals or the resistor in response. As a result the ink will immediately surround the heated plate and they are vaporized into minute air bubbles inside the nozzle. Since the volume of ink exceeds the nozzle, ink droplets excrete on the paper through the nozzle. The process is completed in a millisecond only. However Epson is one of the leading companies that do not use this particular method.
Quality of printing depends on the smooth ink flow. If the ink inside the printer cartridges starts drying then the flow gets blocked and prints will not be coming up or if they come up they will be of poor quality or distorted. This happens most often when the ink level becomes low.
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