The difference between thermal foaming nozzles and industrial piezoelectric nozzles

There are two main types of nozzles currently on the market, one is a thermal foam nozzle and the other is an industrial piezoelectric nozzle. Thermal foaming nozzle inkjet uses a heated nozzle, that is, a thin film resistor is used to rapidly heat the ink in the ink ejection area to over 300°C, forming countless tiny bubbles. The bubbles gather into large bubbles at an extremely fast speed and expand, forcing Ink droplets are ejected from the nozzle. After the bubble continues to grow for a few microseconds, it disappears back onto the resistor. As the bubble disappears, the ink in the nozzle also retracts. Then, due to the suction generated by the surface tension of the ink, new ink will be drawn to the ink ejection area to prepare for the next cycle of printing. The ink output cannot be accurately controlled, so the ink output is large. Since the thermal foaming nozzle works under high temperature and high pressure for a long time, it will cause serious corrosion of the nozzle, and it is easy to cause ink droplets to splash and nozzle clogging. Therefore, the service life of the thermal foaming nozzle is very short. In addition, due to the influence of heat, its The water content of the ink is high, so the sprayed images are not easy to dry and there is no guarantee of quality. Industrial piezoelectric nozzles use special crystal materials that can sensitively respond to voltage. When exposed to voltage, this special crystal will undergo slight deformation, causing the ink to print from the nozzle through the flow channel. When the voltage is interrupted, this special crystal will It will quickly return to the initial position, and its ink output can be precisely controlled, so the ink output is small. Because the industrial piezoelectric nozzle inkjet performs mechanical movement at normal temperature, no chemical reaction occurs when the voltage is interrupted, so the ink concentration is not affected, the sprayed image is easy to dry, the range of ink selection is wide, and the degree of loss is small ,long lasting. Arojet color variable data inkjet printing uses a fully imported industrial piezoelectric nozzle, which not only has the advantages of the above industrial piezoelectric nozzles, but also has a printing speed of 100 meters/minute, and the lateral accuracy of the nozzle is adjustable from 200dpi to 1200dpi. The effect is good, and it supports 7-level grayscale printing, monochrome printing or color content printing.
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