Piezoelectric inkjet heads require a vacuum pump and a large pad that absorbs ink

In drop-on-demand inkjet devices, tiny drops of ink are ejected from the inkjet head only when printing is required. In a continuous ink jet device, tiny ink droplets are ejected continuously to the substrate. If no printing is required, the ink droplets are deflected into the recovery tank. Drop-on-demand inkjet There are two kinds of drop-on-demand inkjet technology on the market today. They are thermoelectric foam inkjet and piezoelectric inkjet.

The thermoelectric foaming ink jet printer utilizes a heating resistor to generate bubbles in the ink in the ink tank. The increase in vapor pressure causes the bubbles to generate micro explosions, thereby ejecting a small droplet of ink out of the ink orifice plate and flying toward the paper base. After the bubbles burst, the ink tank is filled with ink again due to the vacuum. In this way, inkjet printing can be realized, but the printing speed is limited.

Piezoelectric ink jet printing uses a piezoelectric plate that is slightly deformed when passing a current. Deformation reduces the space in the ink tank so that a drop of ink is ejected. When the piezo-electric plate of the susceptor electrode is at rest, the ink in the ink hole is dripped. In order to maintain the printing reliability of the nozzle, the piezo-electric inkjet head requires a vacuum pump and a large gasket capable of absorbing ink. The mechanical stability of engineering plastic pump piezoelectric plates is also very sensitive to tiny air bubbles. The system needs to be flushed with ink frequently to eliminate entrapped air. Continuous inkjet printing Continuous inkjet printing technology is generally divided into two types, two-bit deflection and multi-level deflection. In the multi-deflection ink jet head, the ink is continuously ejected from the nozzle under pressure, and on-demand ink jet: The thermoelectric ink jet principle (foamed ink jet) generates air bubbles, the dripping air bubbles burst, and ink ink holes are newly filled. Stop the vibration and fill the ink to complete the breakdown of the ink flow at the piezoelectric resonator into tiny ink droplets.

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