The relationship between UV printer nozzle waveform and UV ink is as follows: different ink corresponding waveform is different, which is mainly determined by the sound velocity, ink viscosity,
The ink density value is a different comprehensive influence. Most current sprinkler heads have flexible waveforms to accommodate different inks.
The function of the waveform file of sprinkler head: waveform file is the time process of making piezoelectric ceramics of sprinkler head work. Generally, it has a rising edge (charging extrusion time).
Continuous extrusion time (duration of extrusion), falling edge (release time of extrusion), and different time gave will have significant changes on the ink drops squeezed out of the nozzle.
One, drive waveform design principle
The design of the driving waveform involves the application of three principles of the wave. The amplitude, frequency, and phase all affect the final action of the piezoelectric plate. The magnitude of the amplitude affects the droplet velocity
This is easy to recognize and feel, but the effect of the frequency (wavelength) on the droplet speed is not necessarily very profound, usually, this is a curve change with a maximum peak (optimal value).
Optional, so the actual use of different ink characteristics to confirm the best value.
Second, ink sound speed on the waveform
Usually faster than heavy ink. The sound speed of water-ink is higher than that of oil ink. For the same nozzle, with different densities of ink,
Its waveform in the best wavelength to be adjusted, such as driving the wavelength width of water ink than oil ink is smaller.
Three, ink viscosity on the waveform
When the UV printer prints in multi-point mode, it needs to pause for a moment after the end of the first drive waveform before sending the second waveform.
When the second wave is started, it depends on the natural oscillation change of nozzle surface pressure after the first wave is finished, which just decays to zero. (different ink viscosity will affect the decay time,
Therefore, stable ink viscosity is also an important guarantee to ensure stable printing), and it is better to access when the phase is also zero, otherwise, the wavelength of the second wave should be changed to ensure normal inkjet.
This also increases the difficulty of adjusting the best inkjet waveform.
Four, ink density value on the waveform
When the ink density value is different, its sound velocity is also different. Under the condition that the size of the nozzle piezoelectric piece has been determined,
Generally, only the pulse width and length of the driving waveform can be changed to obtain the optimal peak pulse point.
At present, the UV printer market has some high head, the original print 4 mm distance of the head, modified to high wave to make it print 1 cm.
But this, on the one hand, will greatly reduce the speed of printing, on the other hand, flying ink, string color, and other failures are more frequent, the technical level of UV printer manufacturers higher requirements.