Effect of Front and Back Suppressing Vibration on Actuation Waveform Design of DoD Inkjet Printer to Droplet Speed and Volume (original) (raw)
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IOP Conference Series: Materials Science and Engineering
There are two techniques that can be used to improve the print quality of an inkjet printer, namely binary and greyscale techniques. In the greyscale technique, the method used is the multi drop ejection method. In the multidrop ejection method, it is more difficult to control droplet behaviour because the possibility of residual vibration and crosstalk will be higher, which can cause satellites and ligaments that can make poor print quality. In this study, we reveal how to control droplet behaviour in a multidrop ejection method so that it can produce good quality droplets. The comparison of droplet image that generated from basic waveform with the waveform using preliminary and suppressing vibration, without and with adjustments of actuation voltage was also studied.
Effects of the actuation waveform on the drop size reduction in drop-on-demand inkjet printing
Acta Mechanica Sinica, 2020
In this study the effects of the actuation waveforms on the droplet generation in a drop-on-demand inkjet printing are studied systematically by numerical simulations. Two different types of waveforms, namely the unipolar and bipolar actuations, are investigated for three fluids with different physical properties. We focus on two key parameters, which are the dwell time and the velocity amplitude. For the unipolar driving, the ejection velocity and the ejected liquid volume are both increased as the velocity amplitude becomes larger. The dwell time only has minor effects on both the ejection velocity and the ejected liquid volume. The ejection velocity decreases significantly for large liquid viscosity, while the influences of viscosity on the ejected liquid volume are much weaker. Four different droplet morphologies and the corresponding parameter ranges are identified. The droplet radius can be successfully reduced to about 40% of the nozzle exit radius. For the bipolar waveforms, same droplet morphologies are observed but with shifted boundaries in the phase space. The minimal radius of stable droplet produced by the bipolar waveforms is even smaller compared to the unipolar ones.
2017
For advancing the experiment system standard of Inkjet printer that is being developed, the actual natural period, fire limitation number in droplet weight measurement and observation distance in droplet velocity measurement was investigated. In another side, the study to control the droplet volume in inkjet printer with negative actuating waveform method is still limited. Therefore, the effect of negative waveform with preliminary and suppressing vibration addition on the droplet formation process, droplet shape, volume and velocity were evaluated. The different voltage and print-head temperature were exerted to obtain the optimum preliminary and suppressing vibration. The mechanism of different phenomenon from each waveform was also discussed.
Evaluation of the standard deviation of droplet speed on grey-scale technique of DoD inkjet printer
IOP Conference Series: Materials Science and Engineering, 2021
The print quality of an inkjet printer is determined by the quality of the droplets. The droplet quality of a DoD inkjet printer is affected by speed variation between the droplets that generated from different nozzles. The effectiveness of a preliminary vibration using the W waveform design to generate spherical droplet without satellite and ligament has been denoted from previous studies. The waveform design considered to influence the speed variations of droplet. The standard deviation of droplet speed from different waveform design was investigate and evaluated. In this study, it is evidenced that by performing rear-wave adjustment on the W wave design can effectively reduce the standard deviation of droplet speed and produce the highest average speed.
Analysis of the Droplet Ejection for Piezoelectric-driven Industrial Inkjet Head
2006
A hybrid design tool combining one-dimensional (1D) lumped parameter model and three-dimensional (3D) computational fluid dynamics (CFD) approach has been developed and applied to industrial inkjet head design for the application of direct writing on printed circuit boards (PCB). Lumped element modeling technique is applied to simplify the composite Inkjet print head system and the calculation of lumped parameters such as compliance, resistance and inertance is explained theoretically. Performance of 1D analysis shows that it is useful for the evaluation of a proposed design of inkjet head. Time sequence of droplet generation is verified by the comparison between 3D analysis result and photographic images acquired by stroboscopic technique. The developed model helps to understand the drop formation process and influence of flow part on the jetting performance.
Ink drop motion in wide-format printers
Chemical Engineering and Processing: Process Intensification, 2009
The flow of ink drops was investigated for use in wide-format printing devices. The behavior of ink drops ejected from Drop-On-Demand (DOD) piezoelectric (push-mode) printing heads was defined and measured using optical techniques. The combination of velocity measurements from the Laser Doppler Velocimeter and data captured in images taken by an Image Visualization system gave a comprehensive view of the printing head performance. The piezoelectric printing head was examined close to real operational conditions in order to determine the optimal parameters for quality printing.
Processes, 2022
The multi-drop method with a good droplet quality is a big challenge in inkjet technology. In this study, optimization of Drop on Demand (DoD) inkjet printer waveform design was conducted. The effectiveness of the waveform design, so-called W waveform, from previous study as a preliminary vibration for the multi-drop ejection method was investigated. The unmodified W waveform was proven not to be an effective waveform for lower viscosity of liquid, especially when compared by the standard waveform obtained from a print-head manufacturer. Edible ink with a viscosity below the optimum range for print-head specifications was employed as the operating liquid. The preliminary vibration W waveform was modified to improve the droplet quality of the edible ink. It was proven that a 40% adjusted voltage of the rear wave of the W waveform was effective as the optimum waveform design for edible ink. The droplet quality of the multi-drop ejection method for grey-scale technology was improved by...
Performance improvement of a drop-on-demand inkjet printhead: a feedforward control based approach
The printing quality delivered by a Drop-on-Demand (DoD) inkjet printhead is limited due to the residual oscillations in the ink channel. The maximal jetting frequency of a DoD inkjet printhead can be increased by quickly damping the residual oscillations and by bringing in this way the ink channel to rest after jetting the ink drop. This paper proposes an optimization-based method to design the input actuation waveform for the piezo actuator in order to improve the damping of the residual oscillations. A discrete-time transfer function derived from the narrow-gap model is used to predict the response of the ink channel under the application of the piezo input. Simulation and experimental results are presented to show the applicability of the proposed method.
Control Engineering Practice, 2011
The printing quality delivered by a Drop-on-Demand (DoD) inkjet printhead is limited due to the residual oscillations in the ink channel. The maximal jetting frequency of a DoD inkjet printhead can be increased by quickly damping the residual oscillations and by bringing in this way the ink channel to rest after jetting the ink drop. This paper proposes an optimization-based method to design the input actuation waveform for the piezo actuator in order to improve the damping of the residual oscillations. A discrete-time transfer function derived from the narrow-gap model is used to predict the response of the ink channel under the application of the piezo input. Simulation and experimental results are presented to show the applicability of the proposed method.
Drop-on-demand inkjet printhead performance improvement using robust feedforward control
2011
The printing quality delivered by a Drop-on-Demand (DoD) inkjet printhead is mainly limited due to the residual oscillations in the ink channel. The maximal jetting frequency of a DoD inkjet printhead can be increased by quickly damping the residual oscillations and by bringing in this way the ink-channel to rest after jetting the ink drop. The inkjet channel model obtained is generally subjected to parametric uncertainty. This paper proposes a robust optimization-based method to design the input actuation waveform for the piezo actuator in order to improve the damping of the residual oscillations in the presence of parametric uncertainties in the ink-channel model. Simulation results are presented to show the efficacy of the proposed method. This work has been carried out as part of the Octopus project with Océ Technologies B.V. under the responsibility of the Embedded Systems Institute. This project is partially supported by the Netherlands Ministry of Economic Affairs under the Bsik program.