Definition: Printing technology based on the controlled squirting of extremely tiny drops of ink onto a receiving substrate. * There are three basic types: (1) bubble-jet: a nozzle filled with ink has a heating element at the far end: when this ia heated up, it boils the ink, creating a bubble of gas which ejects the ink (2) piezo-electric: ink is literally squirted out by squeezing the nozzle, using crystals that change shape when a charge is applied across them. * In some designs, dot size can be varied. (3) continuous flow: electrically charged ink flows continually across a gap: these do not reach the paper but are re-circulated through the ink reservoir: an applied electric charge causes a deflection of the stream of ink causing it to hit the paper. Drop size can be varied and it is possible to build up ink on the same spot.

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