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The small character inkjet printer is a continuous ink injection from a nozzle, which divides the ink into many small ink points through the oscillation of the crystal, and then through high voltage charging (general charging voltage is in the hundreds of volts), and finally through the high voltage electric field (several kilovolts) to form a deflection, thereby completing the scanning of the character, and finally spraying the character on the product.

The large character inkjet printer adopts a solenoid valve, which is generally divided into 7 points and 16 points. According to the needs of the character, open different solenoid valves at different times, shoot out the ink, and finally form the character. External pressure is generally required.

High resolution inkjet printer, the formation principle of characters is the same as that of large character inkjet printer, the difference is that high resolution nozzle has many nozzles, most of which are more than 100, and its ink supply method is completely different from that of large character inkjet printers. The large character inkjet printer is the use of solenoid valves, and the high solution inkjet printer no longer uses solenoid valves, the principle of ink supply generally uses crystal oscillation, forming a pressure difference between the crystals, and finally squeezing the ink out and spraying on the surface of the product. Therefore, the high solution is generally printed like a nozzle at a distance of no more than 10mm.