Numerical Study on a Drop-on-Demand Micro Droplet Print Head

2012 ◽  
Vol 217-219 ◽  
pp. 1429-1434
Author(s):  
Cheng Jian Zheng ◽  
Sheng Dong Gao ◽  
Ying Xue Yao
Keyword(s):  
Conceptual Design ◽  
Piezoelectric Actuator ◽  
Numerical Study ◽  
Metal Droplet ◽  
Axisymmetric Model ◽  
Print Head ◽  
On Demand ◽  
Drop On Demand ◽  
Vof Model ◽  
Parametric Studies

A conceptual design of a drop-on-demand(DOD) micro metal droplet print head, which is characterized as the non-heat affection of piezoelectric actuator and a desirable controllability on droplet condition, is devised. With a 2D axisymmetric model and a VOF model, the droplet evolution is simulated for understanding the mechanism within. Parametric studies are followed to investigate relationship between droplet condition and print head parameters for realizing accurate control of droplet condition.

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

Processes ◽  
2022 ◽  
Vol 10 (1) ◽  
pp. 91
Author(s):  
Oke Oktavianty ◽  
Shigeyuki Haruyama ◽  
Yoshie Ishii
Keyword(s):  
Waveform Design ◽  
Optimum Range ◽  
Print Head ◽  
On Demand ◽  
Drop On Demand ◽  
Grey Scale ◽  
Lower Viscosity ◽  
Inkjet Printer ◽  
Ejection Method

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.

Numerical Simulation on Deposition and Solidification Processes of a Molten Metal Droplet Generated by Drop-on-Demand Jetting

2012 ◽  
Vol 538-541 ◽  
pp. 890-894 ◽  
Author(s):  
Peng Yun Wang ◽  
He Jun Li ◽  
Le Hua Qi ◽  
Hai Liang Deng ◽  
Han Song Zuo
Keyword(s):  
Numerical Simulation ◽  
Substrate Temperature ◽  
Metal Droplet ◽  
Dimensional Accuracy ◽  
Droplet Deposition ◽  
On Demand ◽  
Drop On Demand ◽  
Solidification Processes ◽  
Droplet Spray ◽  
Uniform Droplet

Droplet deposition and solidification is vital to dimensional accuracy and mechanical properties of components prepared by uniform droplet spray (UDS) forming. In this paper, a volume-of-fluid (VOF) based model was developed to study the deposition and solidification processes of a 1 mm Al-4.5%Cu droplet generated by drop-on-demand jetting. The effects of droplet falling velocity (0.6-0.8 m/s), initial temperature (933-973 K), and substrate temperature (300-473 K) were investigated. The results show that the final morphology of the deposited droplet is largely dependent on falling velocity and substrate temperature. The solidified droplet obtained from an UDS experiment validates the numerical simulation.

Modeling of Generation of Uniform Metal Droplet During Drop-On-Demand Spray Forming

2012 ◽  
Vol 9 (9) ◽  
pp. 1408-1412 ◽  
Author(s):  
Pengyun Wang ◽  
Hejun Li ◽  
Lehua Qi ◽  
Kezhi Li ◽  
Luo Jun
Keyword(s):  
Metal Droplet ◽  
Spray Forming ◽  
On Demand ◽  
Drop On Demand

PERFORMANCE OF MICRO-INJECTOR WITH INNER BLOCK FOR DROP ON DEMAND APPLICATIONS

2010 ◽  
Vol 24 (13) ◽  
pp. 1373-1376
Author(s):  
MUH-RONG WANG ◽  
TZONG-SHYNG LEU ◽  
YI-JUN SHEN ◽  
WEI-LUNG WENG
Keyword(s):  
Piezoelectric Actuator ◽  
Driving Voltage ◽  
Driving Frequency ◽  
On Demand ◽  
Micro Nozzle ◽  
Drop On Demand ◽  
Flow Through ◽  
The One ◽  
Instability Energy ◽  
Better Than

This paper investigates the characteristics of a piezoelectric micro-injector for drop-on-demand (DOD) applications. The micro-injector is designed with an inner block inside the chamber to enhance the instability energy for the production of mono-size droplet. The micro-nozzle was fabricated by MEMS processes. The upper chip is a silicon chip with two holes as the inlet and outlet of the liquid matter. A diaphragm is mounted on the center of the upper chip. The lower chip has an orifice of 50µm in diameter. The flow through the chamber is used to promote the refilling mechanism for droplet generation. A piezoelectric actuator operated in push mode (D33) was mounted on the upper chip to drive the liquid through the nozzle. An inner block is designed on the inner side of the upper chip. Results show that the micro-injector with inner block could generate mono-size droplet under the driving voltage ranging from 62.5 to 150 volt at frequency of 3.2 kHz. The droplets size was 60µm with velocity ranging from 3.3 to 4.7 m/s which is higher than the case without inner block. As a comparison, the injection of the micro-injector without inner block needs a much higher driving voltage of 112.5 volt at driving frequency of 9.7kHz. It is concluded that the micro-injector with the inner block performs better than the one without the inner block.

Experimental Research of Pneumatic Drop-on-Demand High Temperature Droplet Deposition for Rapid Prototyping

2009 ◽  
Vol 419-420 ◽  
pp. 405-408 ◽  
Author(s):  
Xiang Hui Zeng ◽  
Le Hua Qi ◽  
Hua Huang ◽  
Xiao Shan Jiang ◽  
Yuan Xiao
Keyword(s):  
Melting Point ◽  
Rapid Prototyping ◽  
Oxygen Content ◽  
Vertical Direction ◽  
Metal Droplet ◽  
High Melting ◽  
Droplet Deposition ◽  
High Melting Point ◽  
On Demand ◽  
Drop On Demand

Generating high-melting-point metals droplet is a bottleneck in the area of droplet-based rapid prototyping. In our research, a pneumatic drop-on-demand (DOD) generator was developed which can spray A2024 alloy successfully, and the maximum ejection temperature can reach to 1200°C. Experiments were conducted to examine the influence of the oxygen content on the metal droplet spray. The uniform A2024 droplet was ejected stably under the condition where the oxygen content was less than 25ppm. As the solenoid valve was opened once with different time span, four cases were observed: droplet stream, three droplets, two droplets and one single droplet. A2024 droplets were deposited continuously on top of each other in vertical direction to form vertical columns, which meant the graphite nozzle can be used in experiment. A simple square tube was produced by regulating the droplet generator, which showed the rapid prototyping by high-melting-point droplet deposition is feasible.

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