Inkjet: Nozzles Spraying Microscopic Dots of Ink

Since their invention in the 80's, inkjet printers remain as one of the most popular kinds of printers available to consumers. This is due to the fact that these printers and their ink are relatively inexpensive and their printed outputs can range from decent quality to high resolution.

As the name suggests, inkjet printers use nozzles to spray jets of (or rather dots) of ink onto paper. The ink is heated up and creates a thermal bubble. This bubble is able to push more ink out of a nozzle onto the paper. Moreover, when the bubble “pops”, a vacuum is created, thereby pulling more ink to the print head from the cartridge.

Inkjet printers are a type of non-impact printers, which means that the print head inside doesn't directly touch the paper and instead sprays the ink bit by bit as a belt moves it back and forth.

Usually attached on the print head are the cartridges that hold the liquid ink. As the ink flows out of the cartridge, it is then mixed inside the print head into different colors, depending on what you are printing. Then the ink is sprayed through the many nozzles (sometimes reaching up to 600 nozzles in one print head) as dots on the paper, with each dot as small as 50 to 60 microns in diameter. Although the ink is kept in liquid form inside the printer, it quickly dries up as the paper is rolled out to the tray.

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