Continuous inkjet printer is also called CIJ inkjet printer. Its working principle is that under the action of pressure, ink enters the inkjet cavity, which is equipped with a crystal oscillator. Through vibration, the ink is ejected from a nozzle with extremely small aperture (generally 60 microns) and forms fixed interval dots. Through CPU processing and phase tracking, some ink dots passing through the charging electrode are charged with different charges, and undergo different offsets under a high-voltage magnetic field of several thousand volts. They fly out of the print head and land on the surface of the moving product, forming a dot matrix, thereby forming text, numbers or graphics.