• Title/Summary/Keyword: Inkjet Volume

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Micro Pattern Control of Metal Printing by Piezoelectric Print-head (압전 프린트 헤드에 의한 금속프린팅의 미세패턴제어)

  • Yoon, Shin-Yong;Choi, Geun-Soo;Baek, Soo-Hyun;Chang, Hong-Soon;Seo, Sang-Hyun
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.24 no.2
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    • pp.147-151
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    • 2011
  • We were analyzed the piezoelectric characteristic for electronics printing to inkjet printing system. These applications were possible use to Actuator, MEMS, FPCB, RFID, Solar cell and LCD color filter etc. Piezoelectric print head is firing from ink droplet control consideration ink viscosity properties. At this time, micro pattern for PCB metal printing was possible by droplet control of piezoelectric driving. These driving characteristics are variable voltage pulse waveform. We are used the piezoelectric analysis software of Finite Element Method (FEM), Piezoelectric design parameters are acquired from piezoelectric analysis, and measurement of piezoelectric. It designed for piezoelectric head to possible electric print pattern of inkjet printing system. For this validity we were established through in comparison with simulation and measurement. Designed piezoelectric specification obtained voltage 98V, firing frequency 10 kHz, resolution 360dpi, drop volume 20pl, nozzle number 256, and nozzle pitch 0.33 mm.

Development of a new thermal inkjet head with the virtual valve fabricated by MEMS technology (멤스기술을 이용한 가상밸브가 있는 새로운 잉크젯 헤드 개발)

  • Bae, Ki-Deok;Baek, Seog-Soon;Shin, Jong-Woo;Lim, Hyung-Taek;Shin, SuHo;Oh, Yong-Soo
    • Proceedings of the KSME Conference
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    • 2003.11a
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    • pp.1892-1897
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    • 2003
  • A new thermal inkjet printer head on SOI wafer with virtual valve was proposed. It was composed of two rectangular heaters with same size. So we could call it T-jet(Twin jet). T-jet has a lot of merits. It has the advantage of being fabricated with one wafer and is easy to change the size of chamber, nozzle, restrictor and so on. However, above all, It is the best point that T-jet has a virtual valve. And it was manufactured on SOI wafer. The chamber was formed in its upper silicon whose thickness was 40um. The chamber's bottom layer was silicon dioxide of SOI wafer and two heaters were located underneath the chamber's ceiling. And the restirctor was made beside the chamber. Nozzle was molded by process of Ni plating. Ni was 30um thick. Nozzle ejection test was performed by printer head having 56 nozzles in 2 columns with 600NPI(nozzle per inch) and black ink. It measured a drop velocity of 12m/s, a drop volume of 30pl, and a maximum firing frequency of 12KHz for single nozzle ejection. Throwing out the ink drop in whole nozzles at the same time, it was observed that the uniformity of the drop velocity and volume was less than 4%.

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Molten Metal Inkjet System (용융 메탈 잉크젯 시스템)

  • Lee Taik-Min;Kang Tae-Goo;Yang Jeong-Soon;Jo Jeong-Dai;Kim Kwang-Young;Kim Dong-Soo
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2006.05a
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    • pp.585-586
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    • 2006
  • In this paper, we present a design, analysis, fabrication and performance test of the novel DoD metal-jet system for application to the high-density and high-temperature-melting materials. Based on the theoretical analysis, we design the metal-jet print head system and fabricate the metal-jet system, which can eject the droplet of lead-free metal solder in the high-temperature. In the experimental test, we set up the test apparatus for visualization of the droplet ejection and measure the Ejected droplet volume and velocity. As a result, the diameter, volume and the velocity of the ejected droplet are about $65-70{\mu}m$, 145-180 pl and 4m/sec. We also fabricate vertical and inclined 3D micro column structures using the present molten metal inkjet system. The measured geometries of the micro column structures are about height of $2,100{\mu}m$, diameter of $200{\mu}m$ and aspect ratio of 10.5 for vertical micro column and $1,400{\mu}m$ of height and $150{\mu}m$ of diameter for $65^{\circ}$-inclined micro column, respectively.

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Organic thin-film transistors and circuits manufactured by sub-femtoliter inkjets

  • Someya, Takao;Sekitani, Tsuyoshi;Noguchi, Yoshiaki;Yokota, Tomoyuki;Klauk, Hagen;Zschieschang, Ute
    • 한국정보디스플레이학회:학술대회논문집
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    • 2008.10a
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    • pp.1229-1232
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    • 2008
  • We have successfully manufactured high-quality top-contact organic thin-film transistors using inkjet technologies with sub-femtoliter droplet volume. Silver fine lines were directly patterned by inkjet on pentacene channel layers. The minimum width of silver lines was $1{\mu}m$ with without the need for pre-patterning or surface pretreatments. The mobility was $0.3\;cm^2/Vs$.

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Nanoliter Reactor Arrays for Antibiotic Study

  • Park, Jin-Won
    • Bulletin of the Korean Chemical Society
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    • v.28 no.10
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    • pp.1709-1714
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    • 2007
  • It is demonstrated in this study that the nanoliter reactor arrays with an inkjet printing, can be used for high throughput screen of antibiotic function. As a model antibiotic, gramicidin was used in this study. The gramicidin embedded lipid vesicles were immobilized on the surface in the nanoliter reactor structure with control of the volume in the nanoliter reactor. By dispensing acidic drops into the reactor, the gramicidin function was monitored. The technique developed in this research also has a great potential to be used for discovery of drugs.

Effects of Viscosity on Dispersion Stability of Nano CoAl2O4 Ceramic Ink

  • Lee, Ji-Hyeon;Hwang, Hae-Jin;Kim, Jin-Ho;Hwang, Kwang-Taek;Han, Kyu-Sung
    • Journal of the Korean Ceramic Society
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    • v.52 no.6
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    • pp.497-501
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    • 2015
  • Inkjet printing is a widespread technology, offering advantages such as high-quality decoration, a continuous process, and the accurate direct reproduction of patterns or pictures. In inkjet printing technology, the dispersion stability of ceramic ink is one of the most important factors. In this study, the dispersion stability of blue $CoAl_2O_4$ ink for ceramic inkjet printing is systematically investigated. Blue $CoAl_2O_4$ pigment was synthesized by a solid-state reaction and then milled to less than 300nm in size. In order to investigate the influence of the viscosity on the dispersion stability, two types of $CoAl_2O_4$ ceramic inks (termed here Blue L and Blue H) were prepared using different volume ratios of ethylene glycol and ethanol. The Blue L and Blue H ink solutions contained cetyltrimethylammonium bromide(CTAB) as a dispersive agent. The viscosity, surface tension and jetting stability of the $CoAl_2O_4$ ceramic inks were analyzed using a rheometer, a surface tension meter and a dropwatcher. The dispersion stability of the $CoAl_2O_4$ ceramic ink was investigated by a multiple light-scattering method. Blue H, a ceramic ink with higher viscosity, showed much better dispersion stability than the Blue L ceramic ink.

Theoretical Analysis and Experimental Characterization of DoD Metal-Jet System (DoD 메탈젯 시스템의 이론적 해석 및 실험적 분석)

  • Lee, Taik-Min;Kang, Tae-Goo;Yang, Jeong-Soon;Jo, Jeong-Dai;Kim, Kwang-Young;Choi, Byung-Oh;Kim, Dong-Soo
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.31 no.1 s.256
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    • pp.11-17
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    • 2007
  • In this paper, we present a design, analysis, fabrication and performance test of the novel DoD metal-jet system for application to the high-density and high-temperature-melting materials. The theoretical analysis of the metal-jet nozzle system is derived by using electro-mechanical analogy. Based on the theoretical analysis results, we design the metal-jet print head system and fabricate the metal-jet system, which can eject the droplet of lead-free metal solder in high-temperature. In the experimental test, we set up the test apparatus for visualization of the droplet ejection and measure the ejected droplet volume and velocity. As a result, the diameter, volume and the velocity of the ejected droplet are about 65 $\mu$m $\sim$ 70 $\mu$m, 145p1 $\sim$ 180 pl and 4m/s, which shows quite good agreement with the theoretical analysis results of the 75 $\mu$m-diameter and 220 pl-volume of droplet. In comparison with the experimental result, the errors of diameter and volume are 7% $\sim$ 13% and 18 $\sim$ 34%, respectively.

Effective Heater-Area and Droplet-Volume Adjustable Microinjectors Using a Digitally Controlled Single Heater (단일 히터의 디지털 구동을 통한 유효 히터면적 변화 및 분사 액적크기 조절이 가능한 미소유체분사기)

  • Je Chang Han;Kang Tae Goo;Cho Young-Ho
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.29 no.1 s.232
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    • pp.67-73
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    • 2005
  • The paper presents a single-heater microfluid injector, whose ejected droplet volume is adjusted by digital current path control for a single microheater. The previous droplet volume adjustable methods have used the digital current control for multiple heaters or the analog current control for a single heater, while the present method uses the digital current control for a single microheater. Two different microinjectors, having a rectangular heater and a circular hearter, are designed and fabricated in the chip area of $7.64\;mm{\times}5.26\;mm$. The fabricated microinjectors have been tested and characterized for the number, size, shape and lifetime of the generated bubbles as well as for the volume and velocity of the ejected droplets. The input power for the rectangular heater and the circular heater has been varied in the ranges of $8.7{\sim}24.9{\mu}W\;and\;8.1{\sim}43.8{\mu}W$, respectively. The projected area of the generated bubble has been changed in the ranges of $440{\sim}l,3600{\mu}m^2\;and\;800{\sim}3,300{\mu}m^2$ for the rectangular heater and the circular heater, respectively. The microinjector with the rectangular heater ejects three discrete levels of the droplet in the volume range of $9.4{\sim}20.7pl$ with the velocity range of $0.8{\sim}1.7m/s$, while the microinjector with the circular heater achieves five discrete levels of the droplet in the volume range of $7.4{\sim}27.4pl$ with the velocity range of $0.5{\sim}2.8m/s$.

The present status and future aspects of the market for printed electronics (인쇄전자 산업시장의 현황과 전망)

  • Park, Jung-Yong;Park, Jae-Sue
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.17 no.2
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    • pp.263-272
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    • 2013
  • Printed electronics creates electrically functional devices by printing on variety of substrates. Printing typically uses common printing equipment or other low-cost equipment suitable for defining patterns on material, such as screen printing, flexography, gravure, offset lithography and inkjet. Compared to conventional manufacturing of microelectronics, printed electronics is characterized by simpler and more cost-effective fabrication of high and low volume products. Now there is huge effort towards printing many other more functional components, from displays to transistors to photovoltaic cells, using the full range of printing technologies - from inkjet to roll to roll analogue print techniques. The market for printed electronics will rise from $1.99 billion in 2010 to $55.10 billion in 2020. In 2030, this industry could be $300 billion - larger than the silicon semiconductor industry - from lighting to displays[8].

Three-dimensional Bio-printing Technique: Trend and Potential for High Volume Implantable Tissue Generation

  • Duong, Van-Thuy;Kim, Jong Pal;Kim, Kwangsoo;Ko, Hyoungho;Hwang, Chang Ho;Koo, Kyo-in
    • Journal of Biomedical Engineering Research
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    • v.39 no.5
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    • pp.188-207
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    • 2018
  • Recently, three-dimensional (3D) printing of biological tissues and organ has become an attractive interdisciplinary research topic that combines a broad range of fields including engineering, biomaterials science, cell biology, physics, and medicine. The 3D bioprinting can be used to produce complex tissue engineering scaffolds based on computer designs obtained from patient-specific anatomical data. It is a powerful tool for building structures by printing cells together with matrix materials and biochemical factors in spatially predefined positions within confined 3D structures. In the field of the 3D bioprinting, three major categories of the 3D bioprinting include the stereolithography-based, inkjet-based, and dispensing-based bioprinting. Some of them have made significant process. Each technique has its own advantages and limitations. Compared with non-biological printing, the 3D bioprinting should consider additional complexities: biocompatibility, degradability of printing materials, cell types, cell growth, cell viability, and cell proliferation factors. Numerous 3D bioprinting technologies have been proposed, and some of them have been making great progress in printing several tissues including multilayered skin, cartilaginous structures, bone, vasculature even heart and liver. This review summarizes basic principles and key aspects of some frequently utilized printing technologies, and introduces current challenges, and prospects in the 3D bioprinting.