Ultrasonic spraying is a spraying technology, which is a spraying method based on ultrasonic atomizing nozzle technology. The material to be sprayed is first in a liquid state, and the liquid can be solution, sol, suspension, etc. The liquid coating is first atomized into fine particles by an ultrasonic atomization device, and then uniformly coated on the surface of the substrate by a certain amount of carrier gas. , thus forming a coating or film.
Ultrasonic spraying is liquid atomization through ultrasonic oscillation. The process of coating is atomized does not require any gas, that is, the atomization process does not require pressure, and only a very low carrier gas pressure is applied after atomization to transport the liquid mist, so it is relatively The liquid rebound and splash caused by the high-pressure air of the two-fluid spraying are greatly reduced, thereby greatly improving the utilization rate of the paint. The raw material utilization rate of ultrasonic spraying is more than 4 times that of ordinary air spraying, and the utilization rate can reach more than 90%.
The main factor that affects the thickness accuracy of the coating is the spray flow of the coating, that is, the amount of material loaded on the substrate per unit time. The ultrasonic nozzle does not exert any pressure on the liquid, so the flow rate of the sprayed paint liquid can be completely controlled by the high-precision metering pump, thus realizing the high-precision spray flow control. For example, for a high-precision syringe pump, the flow control accuracy can reach the level of picoliters per second, and the micro-channel design of the ultrasonic nozzle can also achieve the overall control accuracy of nanoliters per second.
Because the ultrasonic nozzle realizes the liquid atomization through ultrasonic oscillation, and the atomized particles are determined by the ultrasonic oscillation frequency, so it is different from the two-fluid nozzle. risk of nozzle clogging.