Rapid jetting status inspection and accurate droplet volume measurement for a piezo drop-on-demand inkjet print head using a scanning mirror for display applications

2017 ◽  
Vol 88 (2) ◽  
pp. 025109 ◽  
Author(s):  
Dong-Youn Shin ◽  
Minsung Kim
Keyword(s):  
Volume Measurement ◽  
Droplet Volume ◽  
Print Head ◽  
Scanning Mirror ◽  
On Demand ◽  
Drop On Demand

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.

scholarly journals Inkjet printing of viable human dental follicle stem cells

2015 ◽  
Vol 1 (1) ◽  
pp. 112-115 ◽  
Author(s):  
Robert Mau ◽  
Katja Kriebel ◽  
Hermann Lang ◽  
Hermann Seitz
Keyword(s):  
Stem Cells ◽  
Cell Viability ◽  
Inkjet Printing ◽  
Dental Follicle ◽  
Droplet Volume ◽  
Printing Process ◽  
On Demand ◽  
Drop On Demand ◽  
Viable Cells ◽  
Follicle Stem Cells

AbstractInkjet printing technology has the potential to be used for seeding of viable cells for tissue engineering approaches. For this reason, a piezoelectrically actuated, drop-on-demand inkjet printing system was applied to deliver viable human dental follicle stem cells (hDFSC) of sizes of about 15 μm up to 20 μm in diameter. The purpose of these investigations was to verify the stability of the printing process and to evaluate cell viability post printing. Using a Nanoplotter 2.1 (Gesim, Germany) equipped with the piezoelectric printhead NanoTip HV (Gesim, Germany), a concentration of 6.6 ×106 cells ml−1 in DMEM with 10% fetal calf serum (FCS) could be dispensed. The piezoelectric printhead has a nominal droplet volume of ~ 400 pl and was set to a voltage of 75 V and a pulse of 50 μs while dosing 50 000 droplets over a time of 100 seconds. The volume and trajectory of the droplet were checked by a stroboscope test right before and after the printing process. It was found that the droplet volume decreases significantly by 35% during printing process, while the trajectory of the droplets remains stable with only an insignificant number of degrees deviation from the vertical line. It is highly probable that some cell sedimentations or agglomerations affect the printing performance. The cell viability post printing was assessed by using the Trypan Blue dye exclusion test. The printing process was found to have no significant influence on cell survival. In conclusion, drop-on-demand inkjet printing can be a potent tool for the seeding of viable cells.

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 Microstructural Characterization of Pure Tin Produced by the Drop-on-Demand Technique of Liquid Metal Jetting

2019 ◽  
Vol 50 (9) ◽  
pp. 4000-4005 ◽  
Author(s):  
Yaakov Idell ◽  
Nicholas Watkins ◽  
Andrew Pascall ◽  
Jason Jeffries ◽  
Kerri Blobaum
Keyword(s):  
Liquid Metal ◽  
Microstructural Characterization ◽  
On Demand ◽  
Drop On Demand

A Pneumatic Drop-on-Demand Printing System With an Extended Printable Liquid Range

2015 ◽  
Vol 24 (4) ◽  
pp. 768-770 ◽  
Author(s):  
In Ho Choi ◽  
Young Kwon Kim ◽  
Sangmin Lee ◽  
Seung Hee Lee ◽  
Joonwon Kim
Keyword(s):  
On Demand ◽  
Drop On Demand ◽  
Printing System

Formulation of a ceramic ink for a wide-array drop-on-demand ink-jet printer

2003 ◽  
Vol 29 (8) ◽  
pp. 887-892 ◽  
Author(s):  
X. Zhao ◽  
J.R.G. Evans ◽  
M.J. Edirisinghe ◽  
J.H. Song
Keyword(s):  
On Demand ◽  
Drop On Demand ◽  
Ink Jet
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