New actuation waveform design of DoD inkjet printer for single and multi-drop ejection method

Oktavianty, Oke; Tadayuki, Kyotani; Haruyama, Shigeko; Kaminishi, Ken

doi:10.1016/j.addma.2018.12.008

Cited by 20 publications

(15 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The double-pulse waveform copies the same parameters in the single pulse to form the second trapezoidal wave with a separation time (Ts) in between. As parameters of single-pulse waveform are chosen to have higher droplet velocity, when applying two pulses using exactly the same basic waveform, the droplet generated from a two-pulse waveform is followed by a satellite drop (Oktavianty et al, 2019). The velocity of the droplet generated by the second pulse is not higher than the main droplet by the first pulse to catch up and merge into the main droplet (Kwon, 2010).…”

Section: Printhead and Driving Waveform Parametersmentioning

confidence: 99%

“…Literature in driving piezoelectric printhead were mostly using single-nozzle printhead to jet inks (Kwon, 2009b;Shin et al, 2011;Kwon et al, 2016;Liu et al, 2013;Kwon, 2010;Wang and Xi, 2018), while few were adopting multi-nozzle printheads (Kwon and Kim, 2007;Khalate et al, 2012;Ezzeldin et al, 2013;Oktavianty et al, 2019). The printing quality is related to jetting behavior, which is affected by the combined effect of the driving waveform and the ink properties (Liu et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Study on driving waveform design process for multi-nozzle piezoelectric printhead in material-jetting 3D printing

Cheng

Tseng

2021

RPJ

View full text Add to dashboard Cite

Purpose Material-jetting (MJ) three-dimensional (3D) printing processes are competitive due to their printing resolution and printing speed. Driving waveform design of piezoelectric printhead in MJ would affect droplet formation and performance, but there are very limited studies on it besides patents and know-hows by commercial manufacturers. Therefore, in this research, the waveform design process to efficiently attain suitable parameters for a multi-nozzle piezoelectric printhead was studied. Therefore, this research aims to study the waveform design process to efficiently attain suitable parameters for a multi-nozzle piezoelectric printhead. Design/methodology/approach Ricoh’s Gen4L printhead was adopted. A high-speed camera captured pictures of jetted droplets and droplet velocity was calculated. The waveforms included single-, double- and triple-pulse trapezoidal patterns. The effects of parameters were investigated and the suitable ones were determined based on the avoidance of satellite drops and preference of higher droplet velocity. Findings In a single-pulse waveform, an increase of fill time (Tf) decreased the droplet velocity. The maximum velocity happened at the same pulse width, the sum of fill time and hold time (Tf + Th). In double- and triple-pulse, a voltage difference (Vd) above zero in the holding stage was adopted except the last pulse to avoid satellite drops. Suitable parameters for the selected resin were obtained and the time-saving design process was established. Research limitations/implications Based on the effects of parameters and observed data trends, suggested procedures to determine suitable parameters were proposed with fewer experiments. Practical implications This study has verified the feasibility of suggested design procedures on another resin. The required number of trials was reduced significantly. Originality/value This research investigated the process of driving waveform design for the multi-nozzle piezoelectric printhead. The suggested procedures of finding suitable waveform parameters can reduce experimental trials and will be applicable to other MJ 3D printers when new materials are introduced.

show abstract

Section: Printhead and Driving Waveform Parametersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study on driving waveform design process for multi-nozzle piezoelectric printhead in material-jetting 3D printing

Cheng

Tseng

2021

RPJ

View full text Add to dashboard Cite

show abstract

“…Therefore, an optimized waveform design should be employed in the printhead to improve the droplet's quality. A study on waveform design using the preliminary waveform, namely the W waveform, proved effective for solving the problem of the satellite and ligament for both the single and multi-drop ejection methods [9]. The waveform parameters of the W preliminary vibration are illustrated in Figure 2.…”

Section: Introductionmentioning

confidence: 99%

Enhancing Droplet Quality of Edible Ink in Single and Multi-Drop Methods by Optimization the Waveform Design of DoD Inkjet Printer

2022

Self Cite

View full text Add to dashboard Cite

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 optimizing the W waveform design.

show abstract

“…They first determined rise and fall times by the step response time of the piezoelectric actuated vibration plate and then optimized a dwell time by simulating the velocity wave induced by a rising or falling voltage pulse. The design of a multipulse waveform has recently been presented as a means of reducing the length of ligament or satellite drops 24 . Hur’s team utilized the lumped element model of a recirculating piezoelectric inkjet printhead to improve bipolar waveforms, demonstrating that a bipolar waveform with a second pulse voltage of 1/3 than that of the first could suppress residual vibrations within the printhead channel 25 .…”

Section: Introductionmentioning

confidence: 99%

The design of an inkjet drive waveform using machine learning

Kim

Cho

Jung

2022

Sci Rep

View full text Add to dashboard Cite

A drive waveform, which needs to be optimized with ink’s fluid properties, is critical to reliable inkjet printing. A generally adopted rule of thumb for its design is mostly dependent on time-consuming and repetitive manual manipulation of its parameters. This work presents a closed-loop machine learning approach to designing an optimal drive waveform for satellite-free inkjet printing at a target velocity. Each of the representative 11 model inks with different fluid properties was ink-jetted with 1100 distinct waveform designs. The high-speed images of their jetting behaviors were acquired and the big datasets of the resulting drop formation and velocity were extracted from the jetting images. Five machine learning models were examined and compared to predict the characteristics of jetting behavior. Among a variety of machine learning models, Multi-layer Perceptron affords the highest prediction accuracy. A closed-loop prediction algorithm that determined the optimal set of waveform parameters for satellite-free drop formation at a target velocity and employed the most superior learning model was established. The proposed method was confirmed through the printing of an unknown model ink with a recommended waveform.

show abstract

New actuation waveform design of DoD inkjet printer for single and multi-drop ejection method

Cited by 20 publications

References 28 publications

Study on driving waveform design process for multi-nozzle piezoelectric printhead in material-jetting 3D printing

Study on driving waveform design process for multi-nozzle piezoelectric printhead in material-jetting 3D printing

Enhancing Droplet Quality of Edible Ink in Single and Multi-Drop Methods by Optimization the Waveform Design of DoD Inkjet Printer

The design of an inkjet drive waveform using machine learning

Contact Info

Product

Resources

About