Study of Micro-Droplet Behavior for a Piezoelectric Inkjet Printing Device Using a Single Pulse Voltage Pattern

Wu, Hsuan-Chung; Shan, Tzu-Ray; Hwang, Weng-Sing; Lin, Huey‐Jiuan

doi:10.2320/matertrans.45.1794

Cited by 32 publications

(26 citation statements)

References 8 publications

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“…It has been experimentally observed that the drop formation process and ejected drop characteristics strongly depend on the pulse characteristics [ 11 , 13 , 14 ]. Short t rise and t fall times, in the order of few microseconds, are needed to have jet formation.…”

Section: The Physics Of Inkjet Printing: Drop Formation Depositiomentioning

confidence: 99%

Inkjet Printing of Functional Materials for Optical and Photonic Applications

et al. 2016

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Inkjet printing, traditionally used in graphics, has been widely investigated as a valuable tool in the preparation of functional surfaces and devices. This review focuses on the use of inkjet printing technology for the manufacturing of different optical elements and photonic devices. The presented overview mainly surveys work done in the fabrication of micro-optical components such as microlenses, waveguides and integrated lasers; the manufacturing of large area light emitting diodes displays, liquid crystal displays and solar cells; as well as the preparation of liquid crystal and colloidal crystal based photonic devices working as lasers or optical sensors. Special emphasis is placed on reviewing the materials employed as well as in the relevance of inkjet in the manufacturing of the different devices showing in each of the revised technologies, main achievements, applications and challenges.

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Section: The Physics Of Inkjet Printing: Drop Formation Depositiomentioning

confidence: 99%

Inkjet Printing of Functional Materials for Optical and Photonic Applications

et al. 2016

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“…Hence, the trailing thread disintegrated from the liquid column with a lower velocity than the main droplet becomes a satellite droplet in some cases. 9) Within the workable voltage range, three different conditions are observed. The first case is that single droplet can be generated and ejected for each cycle of the waveform, which is the most desirable condition of the DOD inkjet printing process.…”

Section: Observation Of Dropletsmentioning

confidence: 99%

“…If this positive pressure wave has enough energy, it will eject a droplet. 9) In earlier studies, the time evolution of the liquid shape, which includes ejected liquid from nozzle to form liquid column, necking of liquid column, variations of liquid column, and formation as well as combination of main droplet and satellites, has been observed during the formation and ejection of the droplet. 7,10) At early stage of ejection, the contracted transducer expands; liquid in the nozzle is accelerated and pushed out of the nozzle orifice.…”

Section: Introductionmentioning

confidence: 99%

Effects of Pulse Voltage on the Droplet Formation of Alcohol and Ethylene Glycol in a Piezoelectric Inkjet Printing Process with Bipolar Pulse

Tsai

Hwang

2008

Mater. Trans.

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The dynamics of droplet formation of liquid in a piezoelectric inkjet printing process with bipolar pulse and drop-on-demand (DOD) mode is investigated in this study. Two liquids with different viscosities and surface tension coefficients; alcohol and ethylene glycol, are studied. The effects of pulse voltage on the droplet formation are also examined. A piezoelectric actuated inkjet printhead with a nozzle orifice of 30 mm in diameter is employed to conduct the investigations at room temperature (25 C). The complex morphologies of the droplets during their formation, which include ejection and stretching of liquid, contraction of liquid column, pinch-off of liquid column from nozzle exit, breakup of liquid column into primary droplet and possible satellites, and combination of primary drop and satellites, are demonstrated. The droplet size is in the range of 23-37 mm. The investigations also show a workable pulse voltage range; between 28 and 40 volts, exists for the droplets to be smoothly generated and ejected for alcohol where viscosity and surface tension coefficient are smaller. The range is between 30 and 50 volts for ethylene glycol. Within this workable voltage range, one single droplet for each pulse can be achieved with lower voltage. For the intermediate voltage, two droplets are generated initially and collide into one during the flying stage. For the higher voltage, multiple droplets are formed without recombination. It is also found that the velocities of the main droplet and satellite droplet in the different voltage ranges are responsible for whether the multiple initial droplets can be recombined.

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“…The experimental cell boundaries segment after advection segment before advection observation of the droplet ejection behaviors caused by a single or a double voltage pulse is successfully explained through the propagation of acoustic pressure waves. 25,26) During positive pressure period, the meniscus at the nozzle exit is formed and then a jet is created. The ejected liquid is separated from nozzle when the negative pressure is applied.…”

Section: Resultsmentioning

confidence: 99%

Effects of Actuating Pressure Waveforms on the Droplet Behavior in a Piezoelectric Inkjet

Lin

2010

Mater. Trans.

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This paper presents a numerical analysis of a piezoelectric actuated droplet generator. A three-dimensional finite difference numerical model based on a SOLA (solution algorithm) scheme for the solution of governing equations of the flow field and a volume-of-fluid method for tracing the fluid interfaces are presented. The surface tension is modeled using a continuum surface force concept and thus computed as a function of the interfacial curvature. The pressure pulse at the nozzle inlet, which is related to the applied voltage, was imposed according to the propagation theory of acoustic waves. The effects of the pressure waveforms, including positive and negative pressure amplitudes, operating period and acceleration of the positive pressure, on the droplet ejection process are simulated. The performance of piezoelectric inkjet: droplet break time, droplet tail length, droplet velocity and droplet volume are analyzed. The simulation results show that the tail length and volume of the droplet increase with the amplitude of the positive pressure and operating period. The breakup time of the droplet is shorter when the amplitude of the negative pressure increases. The factors that influence satellite droplets are also investigated in this study.

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Study of Micro-Droplet Behavior for a Piezoelectric Inkjet Printing Device Using a Single Pulse Voltage Pattern

Cited by 32 publications

References 8 publications

Inkjet Printing of Functional Materials for Optical and Photonic Applications

Inkjet Printing of Functional Materials for Optical and Photonic Applications

Effects of Pulse Voltage on the Droplet Formation of Alcohol and Ethylene Glycol in a Piezoelectric Inkjet Printing Process with Bipolar Pulse

Effects of Actuating Pressure Waveforms on the Droplet Behavior in a Piezoelectric Inkjet

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