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print principle: the case of thermal inkjet technology bubble; nozzle using semiconductor thin-film technology, while using high-precision laser process and coating technology to form a plurality of nozzle hole diameter of about 50 microns; these nozzles was high density arrangement, upon receipt of the heat signal, in a very short moment the ink is heated by the current to 260 ° C or so,? partial ink is heated to form bubbles produce expansion ink will be ejected. Easy to make the nozzle material due to high temperature corrosion, it is such a short nozzle life, mostly for use disposable ink cartridge nozzle.