Uv printer nozzle waveform and ink relationship

        The relationship between the uv printer nozzle waveform and the uv ink is different: the waveform corresponding to different inks is also different, which is mainly caused by the different sound speed, ink viscosity and ink density value of the ink. Most of the current nozzles have flexible waveforms to accommodate different inks.

Uv printer nozzle waveform and ink relationship

       Uv printer nozzle waveform and ink relationship

       The role of the nozzle waveform file: the waveform file is the time course for the nozzle piezoelectric ceramic to work. Generally, there is a rising edge (charge extrusion time), continuous extrusion time (extrusion duration), and falling edge (squeeze release time). The different times given will have a significant change in the ink droplets squeezed from the nozzle.

       First, the driving waveform design principle

       The drive waveform design involves the application of the three-factor principle of the wave. Amplitude, frequency, and phase all affect the final action of the piezoelectric sheet. The magnitude of the amplitude has an effect on the ink droplet speed. This is easy to recognize and feel, but the effect of the frequency (wavelength) on the droplet velocity is not necessarily very deep. Usually this is a curve with a maximum peak value (most Good value) is optional, so the actual value should be confirmed according to different ink characteristics.

       Second, the effect of ink sound speed on the waveform

       It is usually faster than a major ink. The speed of sound of water-based inks is greater than the speed of sound of oil-based inks. For the same nozzle, when using different density inks, the optimum wavelength of the waveform should be adjusted. For example, the wavelength of the water-driven ink is smaller than that of the oil-based ink.

       Third, the effect of ink viscosity on the waveform

       When the uv printer prints in multi-point mode, the second waveform needs to be paused after the first drive waveform is finished, and the second waveform is started. When the second waveform is started, it is necessary to see the natural oscillation of the nozzle surface pressure after the end of the first waveform. The change just decays to zero. (Ink viscosity is different, it will affect this decay time, so it is an important guarantee for stable ink printing to stabilize the ink viscosity), and the phase is also good when the phase is zero, otherwise the wavelength of the second wave will be changed. In order to ensure normal inkjet, this increases the difficulty of adjusting the optimal inkjet waveform.

       Fourth, the effect of ink density on the waveform

       When the ink density value is different, its sound speed is also different. Under the condition that the size of the nozzle piezoelectric piece has been determined, the pulse width length of the driving waveform can usually only be changed to obtain the optimum pulse peak point.

       At present, there are some high-drop nozzles on the uv printer market. The original print head with a distance of 8 mm is modified to a high waveform to print 2 cm. However, on the one hand, the printing speed is greatly reduced. On the other hand, the problems such as flying ink and cross-color are more frequent, and the technical level of the uv printer manufacturer is higher.

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