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UV Inkjet Printer-The Relationship between The Nozzle Waveform and Ink of It

The relationship between the UV inkjet printer nozzle waveform and uv ink is as follows: the waveforms corresponding to different inks are also different, which is mainly affected by the difference in ink sound speed, ink viscosity, and ink density. Most current printheads have flexible waveforms to accommodate different inks.

UV Inkjet Printer

The function of the UV printing machine nozzle wave file: The wave file is the time process for the piezoelectric ceramic of the nozzle to work. Generally, it has a rising edge (charging squeeze time), continuous squeeze time (squeeze duration), falling edge (squeeze release time), The different time given will significantly change the ink droplets squeezed out by the nozzle.

1.The principles to design driving waveform

Driving waveform design involves the application of the three-element principle of waves. The amplitude, frequency, and phase all affect the final effect of the piezoelectric sheet. The magnitude has an effect on the ink droplet speed. It is easy to recognize and feel, but the effect of frequency (wavelength) on the ink droplet speed is not necessarily profound. Usually this is a curve with a maximum peak (most (Good value) is optional, so in actual use, confirm this optimal value according to different ink characteristics.

2. Effect of Ink Sound Velocity on Waveform

It is usually faster than heavy ink sounds. The speed of sound of water-based ink is greater than the speed of sound of oily ink. For the same print head, when using inks with different densities, the optimal wavelength in its waveform must be adjusted. For example, the wavelength width of the water-based ink is smaller than that of the oil-based ink.

3. Effect of ink viscosity on waveform

When the wide format UV printer prints in multi-point mode, it is necessary to pause and send the second waveform after the first driving waveform ends, and when the second waveform starts, it depends on the natural oscillation of the nozzle surface pressure after the first waveform ends. The change just decays to zero. (Different ink viscosities will affect this decay time, so it is also an important guarantee for stable ink viscosity to stabilize the ink viscosity), and the access is better when the phase is zero, otherwise the wavelength of the second wave will be changed. In order to ensure normal inkjet, it will increase the difficulty of adjusting the optimal inkjet waveform.

4. Influence of ink density value on waveform

When different ink density values are used, the sound velocity is also different. Under the condition that the size of the piezoelectric plate of the nozzle is determined, the pulse width length of the driving waveform can usually only be changed to obtain the optimal pulse peak point.

UV Printer

At present, there are some high-drop nozzles on the UV printer market. The nozzles that have been printed at a distance of 8 millimeters have been modified to have a high waveform to print 2 cm. However, on the one hand, this will greatly reduce the printing speed, and on the other hand, faults such as flying ink and string color are more frequent, and the technical level of UV printer manufacturers is higher.