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Artigos de revistas sobre o tema "Inkjet nozzle"

Autor: Grafiati

Publicado: 4 de junho de 2021

Última modificação: 1 de fevereiro de 2022

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1

Wu, Sen Yang, Yong He, Jian Zhong Fu e Hui Feng Shao. "Design and Fabrication of a Piezoelectric Bend Mode Drop-on-Demand Inkjet Printhead with Interchangeable Nozzle". Advanced Materials Research 819 (setembro de 2013): 311–16. http://dx.doi.org/10.4028/www.scientific.net/amr.819.311.

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The drop-on-demand (DOD) inkjet printing technology has been widely used in many fields and several types of droplet generators are developed. This paper presents the design, fabrication and tests of a piezoelectric bend mode drop-on-demand inkjet printhead with interchangeable nozzle. A disk-type PZT is actuated to push the liquid out of inkjet printhead by a function generator, and a droplet is formed because of surface tension. The interchangeable nozzle design enables the same printhead to be fitted with nozzles of different orifice size, thus a clogged nozzle can be easily removed for cleaning or replacement. An experimental platform for micro-droplet jetting is built in this paper. The droplet formation is recorded by a CCD camera as pictures, which can be used to measure the droplet dimension. The experiments are carried out by using the self-developed bend mode piezoelectric inkjet printing system. The influence of the drive parameters on the droplet quality is also studied by dispensing water.

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2

Shen, Sheng Chih, Chung Jui Lee, Min Wen Wang, Yi Cheng Chen, Yu Jen Wang e Yung Yue Chen. "Fabrication Micro-Nozzle Plates for Inkjet Print Head Using LIGA Process". Materials Science Forum 594 (agosto de 2008): 132–37. http://dx.doi.org/10.4028/www.scientific.net/msf.594.132.

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This paper presents a novel LIGA-like process to fabricate the nozzle plate for matching the requirements of the 600 dpi inkjet printhead. This novel fabrication technique reduces the production cost from 100% current process to 50%. This mass production technique comprises two main technologies: Ni-Co electroforming and plastic injection molding. The nozzle plate consists ink channels, ink cavities, and nozzles for enhancing the integrity and excusing the assembly process. The dimensions of nozzle plate are 4.16mm in width and 7.3mm in length, respectively. Total thickness of micro-nozzle plates are thickness≦100um(ink channels and ink cavities), and the diameter and pitch of the nozzle holes are 40±3um and 168±3 um, respectively. Straightly speaking, for being the main compositions of the 600 dpi inkjet printhead design, the above fabrication process is qualified enough and capable of yielding satisfactory results.

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3

Shah, Lee e Hur. "Design and Characteristic Analysis of a MEMS Piezo-Driven Recirculating Inkjet Printhead Using Lumped Element Modeling". Micromachines 10, n.º 11 (6 de novembro de 2019): 757. http://dx.doi.org/10.3390/mi10110757.

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The recirculation of ink in an inkjet printhead system keeps the ink temperature and viscosity constant, and leads to the development of a high-performance device. Herein, we propose a recirculating piezo-driven micro-electro-mechanical system (MEMS)-based inkjet printhead that has a pressure chamber, a nozzle, and double restrictors. The design and characteristic analysis are performed using a two-port lumped element model (LEM) to investigate the effect of design parameters on the system responses. Using LEM, the jetting pressure at the pressure chamber, velocity at the nozzle inlet, meniscus pressure, and Helmholtz resonance frequency are predicted and the comparative analysis of the jetting pressure and velocity between LEM and the finite element method (FEM) simulation is conducted to validate our proposed LEM method. Furthermore, the effect of a change in major design parameters on the jetting pressure, velocity, and Helmholtz resonance frequency is analyzed. On the basis of this analysis, the optimized device dimensions are finalized. From our analysis, it is also concluded that the restrictor is more sensitive than the pressure chamber in terms of their variations in depth. As the cross-talk effect can occur due to an array of hundreds or thousands of nozzles, we investigated the effect of a single activated nozzle on the non-activated neighboring nozzles, as well as the effect of multi-activated nozzles on a single central nozzle using our proposed LEM.

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4

de Jong, Jos, Hans Reinten, Herman Wijshoff, Marc van den Berg, Koos Delescen, Rini van Dongen, Frieder Mugele, Michel Versluis e Detlef Lohse. "Marangoni flow on an inkjet nozzle plate". Applied Physics Letters 91, n.º 20 (12 de novembro de 2007): 204102. http://dx.doi.org/10.1063/1.2812473.

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5

OKANO, Mamoru, Tomohiro INOUE, Yoshiharu TAKIZAWA, Tadayuki MATSUDA e Akira MIYAO. "A New Nozzle for Continuous Inkjet Printers". Journal of Advanced Mechanical Design, Systems, and Manufacturing 4, n.º 4 (2010): 764–72. http://dx.doi.org/10.1299/jamdsm.4.764.

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6

Hu, Sige, Daulet Kenzhebalin, Bakedu Choi, George Chiu, Zillion Lin, Davi He e Jan Allebach. "Developing an inkjet printer III: Multibit CMY halftones to hardware-ready bits". Electronic Imaging 2020, n.º 15 (26 de janeiro de 2020): 352–1. http://dx.doi.org/10.2352/issn.2470-1173.2020.15.color-351.

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Nowadays, inkjet printers are widely used all around the world. But how do they transfer the digital image to a map that can control nozzle firing? In this paper, we briefly illustrate that part of the printing pipeline that starts from a halftone image and end with Hardware Ready Bits (HRBs). We also describe the implementation of the multi-pass printing method with a designed print mask. HRBs are used to read an input halftone CMY image and output a binary map of each color to decide whether or not to eject the corresponding color drop at each pixel position. In general, for an inkjet printer, each row of the image corresponds to one specific nozzle in each swath so that each swath will be the height of the printhead [1]. To avoid visible white streaks due to clogged or burned out color nozzles, the method called multi-pass printing is implemented. Subsequently, the print mask is introduced so that we can decide during which pass each pixel should be printed.

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7

Mizunuma, Takehito, Yoko Yamanishi, Shinya Sakuma, Hisataka Maruyama e Fumihito Arai. "Disposable Inkjet Mechanism for Microdroplet Dispensing". Journal of Robotics and Mechatronics 22, n.º 3 (20 de junho de 2010): 341–47. http://dx.doi.org/10.20965/jrm.2010.p0341.

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We succeeded in dispensing microdroplets using a disposable inkjet. The novelty of our device lies in the following points: (1) We used a glass-plate-bonded polydimethylsiloxane (PDMS) membrane to fabricate a leaf spring whose spring coefficient is 14 times higher than that of conventional PDMS membranes. This enabled droplets to be dispensed continuously up to 10 Hz when the membrane vibrated through the use of a multilayer piezoelectric actuator attached to the disposable PDMS chip. (2) The nozzle for droplet dispensing was fabricated from thick photoresist (SU-8) to obtain a hydrophobic surface preventing the production of undesired satellite droplets, yielding a droplet dispensing accuracy of ±16.2 µm. Droplets produced by the disposable nozzle, which was 100 µm in diameter, ranged from 95-105 µm at an applied voltage of 105 V.

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8

Wang, Yuehui, Xiaoli Wu, Ke Wang, Kaiwen Lin, Hui Xie, Xiaobing Zhang e Jingze Li. "Novel Insights into Inkjet Printed Silver Nanowires Flexible Transparent Conductive Films". International Journal of Molecular Sciences 22, n.º 14 (19 de julho de 2021): 7719. http://dx.doi.org/10.3390/ijms22147719.

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Silver nanowire (AgNWs) inks for inkjet printing were prepared and the effects of the solvent system, wetting agent, AgNWs suspension on the viscosity, surface tension, contact angle between ink droplet and poly(ethylene) terephthalate (PET) surface, and pH value of AgNWs ink were discussed. Further, AgNWs flexible transparent conductive films were fabricated by using inkjet printing process on the PET substrate, and the effects of the number printing layer, heat treatment temperature, drop frequency, and number of nozzle on the microstructures and photoelectric properties of AgNWs films were investigated in detail. The experimental results demonstrated that the 14-layer AgNWs printed film heated at 60 °C and 70 °C had an average sheet resistance of 13 Ω∙sq−1 and 23 Ω∙sq−1 and average transparency of 81.9% and 83.1%, respectively, and displayed good photoelectric performance when the inkjet printing parameters were set to the voltage of 20 V, number of nozzles of 16, drop frequency of 7000 Hz, droplet spacing of 15 μm, PET substrate temperatures of 40 °C and nozzles of 35 °C during printing, and heat treatment at 60 °C for 20 min. The accumulation and overflow of AgNWs at the edges of the linear pattern were observed, which resulted in a decrease in printing accuracy. We successfully printed the heart-shaped pattern and then demonstrated that it could work well. This showed that the well-defined pattern with good photoelectric properties can be obtained by using an inkjet printing process with silver nanowires ink as inkjet material.

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9

Yang, Jianmin, Daisuke Katagiri, Sifeng Mao, Hulie Zeng, Hizuru Nakajima e Katsumi Uchiyama. "Generation of controlled monodisperse porous polymer particles by dipped inkjet injection". RSC Advances 5, n.º 10 (2015): 7297–303. http://dx.doi.org/10.1039/c4ra13275k.

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10

Zhong, Yonghong, Haisheng Fang, Qianli Ma e Xuran Dong. "Analysis of droplet stability after ejection from an inkjet nozzle". Journal of Fluid Mechanics 845 (26 de abril de 2018): 378–91. http://dx.doi.org/10.1017/jfm.2018.251.

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Inkjet technology is a commendable tool in many applications including graphics printing, bioengineering and micro-electromechanical systems (MEMS). Droplet stability is a key factor influencing inkjet performance. The stability can be analysed using dimensionless numbers that usually combine thermophysical properties and system dimensions. In this paper, a drop-on-demand (DOD) inkjet experimental system is established. A numerical model is developed to investigate the influence of the operating conditions on droplet stability, including nozzle dimensions, driving parameters (the pulse amplitude and width used to drive droplet formation) and fluid properties. The results indicate that the stability can be improved by decreasing the pulse amplitude and width, decreasing the fluid density and viscosity or increasing the nozzle diameter and fluid surface tension. Based on case analysis and modelling, a dimensionless number ($Z$), the reciprocal of the Ohnesorge number, is numerically determined for a stable droplet to lie in a range between 4 and 8. To explicitly combine the driving parameters, a new stability criterion, $Pj$, is further proposed. A general rule taking into account both $Pj$ and $Z$ is proposed for choosing appropriate driving parameters to eject stable droplets for a known nozzle and fluid, which is further validated by experiments.

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11

Aizawa, Tatsuhiko, Tadahiko Inohara e Kenji Wasa. "Fabrication of Superhydrophobic Stainless Steel Nozzles by Femtosecond Laser Micro-/Nano-Texturing". International Journal of Automation Technology 14, n.º 2 (5 de março de 2020): 159–66. http://dx.doi.org/10.20965/ijat.2020.p0159.

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A dispensing nozzle is an essential mechanical element in inkjet, dot, and bioprinting. To improve the printing resolution, the inner diameter of the nozzle outlet must be as small as possible. A droplet dispensed through a hydrophilic stainless steel outlet expands on the whole outlet surface and along the side surface of the nozzle. This issue can be solved by physical surface modifications. In the present paper, a femtosecond laser micro-/nano-texturing method was developed to transform the originally hydrophilic stainless steel surface of a nozzle to a hydrophobic or superhydrophobic one. First, an AISI304 plate was used to demonstrate experimentally that, on its surface, the tailored micro-/nano-patterns were reproduced as micro-/nano-textures, making the surface superhydrophobic. Second, the technique was applied to the physical surface modification of an AISI304 stainless steel nozzle outlet by optimizing the femtosecond laser machining conditions. A high-speed camera was used to take a snapshot of the dispensed droplet from the surface-modified outlet. Finally, a line-printing experiment was performed to characterize the dispensing behavior of the stainless steel nozzles with and without physical surface modification.

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12

Yu, Zhao Hui, Huan Mei Wang e Guang Xue Chen. "Effects of Nozzle Distance on Micro Quality in 3D Printing". Applied Mechanics and Materials 644-650 (setembro de 2014): 4900–4904. http://dx.doi.org/10.4028/www.scientific.net/amm.644-650.4900.

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The quality of forming model was influenced by the nozzle distance, during three dimensional printing. UV inkjet printer was used to complete 3D printing; the micro quality of printings under different nozzle distances were studied, and the influences of line attributes and surface attributes in micro quality caused by different nozzle distances were analyzed and discussed, in order to get the best micro quality through the nozzle distance setting. The results showed that the nozzle distance within a certain range, the influence on line attributes is greater than the influence on surface attributes caused by nozzle distance; when the nozzle distance is between 1.5-2.5mm, the micro quality of printed image is best.

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13

Wang, Kun, e Juntong Xi. "A method to estimate the transient fluid pressure of a piezoelectric inkjet printer using system dynamic analysis". Rapid Prototyping Journal 23, n.º 6 (17 de outubro de 2017): 1130–35. http://dx.doi.org/10.1108/rpj-11-2015-0174.

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Purpose This paper aims to present a method based on dynamics to find the transient pressure at the nozzle area of a piezoelectric inkjet printer. This pressure responds to input signals of the piezoelectric driver deformation. The pressure at the nozzle is the boundary condition of the computational fluid dynamics model of the inkjet printer nozzle, and serves as the “bridge” between the piezoelectric driver actuation and the droplet generation of an inkjet printer. Design/methodology/approach The transient pressure was estimated using a fluid-solid coupling numerical model of the printerhead. In this study, a simple step-shape signal was applied. The printerhead chamber was considered to act as a linear Helmholtz resonator to determine the system transfer function between the input of driver deformation and the output of pressure. By decomposing the input signal into several simple signals, the transient pressure is the superposition of those calculated pressures. Findings The pressure values determined by transfer function and by superposition match the pressure values directly calculated by a fluid-solid coupling model. This demonstrates the rationality and practicability of the method. Originality/value This paper proposes a method to identify a proper boundary condition of pressure for numerical models that only include the fluid field around the nozzle. This strategy eliminates the need to calculate the complex and unstable fluid-solid coupling for every pattern of input. Additionally, the suitable boundary condition of transient pressure can be set rather than relying on the shape of the PZT driver deformation signal.

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14

Li, Guangyong, Xuan Wu e Dong-Weon Lee. "A galinstan-based inkjet printing system for highly stretchable electronics with self-healing capability". Lab on a Chip 16, n.º 8 (2016): 1366–73. http://dx.doi.org/10.1039/c6lc00046k.

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We present a novel approach to realize highly stretchable electronics with self-healing capability by using a galinstan-based inkjet nozzle, which consists of a main microfluidic channel and a coplanar channel.

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15

Beulen, Bart, Jos de Jong, Hans Reinten, Marc van den Berg, Herman Wijshoff e Rini van Dongen. "Flows on the nozzle plate of an inkjet printhead". Experiments in Fluids 42, n.º 2 (23 de dezembro de 2006): 217–24. http://dx.doi.org/10.1007/s00348-006-0232-8.

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16

Choi, Kyung-Hyun, Arshad Khan, Khalid Rahman, Yang-Hoi Doh, Dong-Soo Kim e Ki-Rin Kwan. "Effects of nozzles array configuration on cross-talk in multi-nozzle electrohydrodynamic inkjet printing head". Journal of Electrostatics 69, n.º 4 (agosto de 2011): 380–87. http://dx.doi.org/10.1016/j.elstat.2011.04.017.

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17

Jingkuang Chen e K. D. Wise. "A high-resolution silicon monolithic nozzle array for inkjet printing". IEEE Transactions on Electron Devices 44, n.º 9 (1997): 1401–9. http://dx.doi.org/10.1109/16.622594.

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18

Yang, Haowei, Kai-Hung Yang, Roger J. Narayan e Shaohua Ma. "Laser-based bioprinting for multilayer cell patterning in tissue engineering and cancer research". Essays in Biochemistry 65, n.º 3 (agosto de 2021): 409–16. http://dx.doi.org/10.1042/ebc20200093.

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Abstract 3D printing, or additive manufacturing, is a process for patterning functional materials based on the digital 3D model. A bioink that contains cells, growth factors, and biomaterials are utilized for assisting cells to develop into tissues and organs. As a promising technique in regenerative medicine, many kinds of bioprinting platforms have been utilized, including extrusion-based bioprinting, inkjet bioprinting, and laser-based bioprinting. Laser-based bioprinting, a kind of bioprinting technology using the laser as the energy source, has advantages over other methods. Compared with inkjet bioprinting and extrusion-based bioprinting, laser-based bioprinting is nozzle-free, which makes it a valid tool that can adapt to the viscosity of the bioink; the cell viability is also improved because of elimination of nozzle, which could cause cell damage when the bioinks flow through a nozzle. Accurate tuning of the laser source and bioink may provide a higher resolution for reconstruction of tissue that may be transplanted used as an in vitro disease model. Here, we introduce the mechanism of this technology and the essential factors in the process of laser-based bioprinting. Then, the most potential applications are listed, including tissue engineering and cancer models. Finally, we present the challenges and opportunities faced by laser-based bioprinting.

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19

Li, Zheng, Jin Huang, Yupeng Yang, Sen Yang, Jiaying Zhang, Pengfei Yuan e Jie Zhang. "Additive Manufacturing of Conformal Microstrip Antenna Using Piezoelectric Nozzle Array". Applied Sciences 10, n.º 9 (28 de abril de 2020): 3082. http://dx.doi.org/10.3390/app10093082.

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Inkjet printing technology is widely used in the manufacture of conformal structures, such as load-bearing antennas or frequency-selective surface radomes. It is particularly promising for preparing conductive patterns on non-developable surfaces. Existing printing technologies employ a single nozzle and a five-axis linkage technique for printing, which is time-consuming. In this study, a conformal plane printing technology based on the arrayed nozzle was developed to prepare conductive patterns on a non-developable surface. The technique actualizes fast printing of passive circuits on a conformal surface, such as a microstrip antenna. Compared to printing techniques employing a single nozzle, the proposed method greatly improves the printing efficiency on conformal surfaces. Specifically, we first developed a model for the driver waveforms and the printing injection parameters via simulation. Subsequently, the accuracy of the computational fluid dynamic simulation results was validated by comparing them with the experimental measurements of droplet trajectory captured using a camera. Next, a droplet spreading model was established, considering energy conservation principles. Finally, a conformal surface printing technology using arrayed nozzles was developed based on the injection parameter and droplet spreading models. The effectiveness and feasibility of the proposed printing method were further validated via simulation and experimental tests of return loss.

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20

GOLOVIN, K. A., e A. N. KOVALEVA. "RESEARCH OF DEPENDENCE OF THE INTENSITY OF WEARING OF STRUCTURAL FORMING NOZZLES ON THE PARAMETERS OF THEIR OPERA TION". News of the Tula state university. Sciences of Earth 2, n.º 1 (2020): 229–34. http://dx.doi.org/10.46689/2218-5194-2020-2-1-229-234.

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The prospects for the use of processing tools that use the energy of expiring highspeed fine jets in mechanical engineering, construction, mining and other industries are obvious today. At the same time, the jet forming, and for some inkjet technologies, also the collimating nozzle is an integral part of any hydro-jet tool.

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21

Park, Sung Jun, Shang Hoon Seo e Jae Woo Joung. "Fine Micro Patterning of Conductive Line by Using Direct Inkjet Printing". Key Engineering Materials 326-328 (dezembro de 2006): 257–60. http://dx.doi.org/10.4028/www.scientific.net/kem.326-328.257.

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A novel selective metallization process to fabricate the fine conductive line based on drop-on-demand (DoD) inkjet printing was studied. Direct inkjet printing is an alternative and costeffective technology for patterning and fabricating objects directly from design or image files without making masks and patterns. The conductive ink used in this experiment consists of 1 to 50 nm silver particles that are homogeneously suspended in an organic carrier. A piezo-electric inkjet print head driven by a bipolar voltage signal is used to dispense 20-40μm diameter droplets. Repeatability of circuitry fabrication is closely related to the formation of steady, satellite-free droplets. Therefore, the ability to form small and stable droplets with a same size, constant velocity and the correct flight angle must be taken into consideration for fine and precise conductive lines. In this study, parameters affecting the pattern formation such as drop formation, drop placement accuracy and velocity deviation between each nozzle have been investigated. As a result, direct inkjet patterning systems equipped with several functioning modules and fine metallic patterns have been developed.

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Futera, Konrad, Konrad Kielbasinski, Anna Młozniak e Malgorzata Jakubowska. "Inkjet printed microwave circuits on flexible substrates using heterophase graphene based inks". Soldering & Surface Mount Technology 27, n.º 3 (1 de junho de 2015): 112–14. http://dx.doi.org/10.1108/ssmt-04-2015-0013.

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Purpose – The purpose of this paper is to present the result of research on a new fabrication technology of printed circuits board and electronics modules. The new method is based on inkjet printing technique on flexible substrates using new generations of heterophase inks. New fabrications method was used to print microwave waveguides and signal splitters as new technology demonstrators. Design/methodology/approach – A fully Inkjet printed filter was printed on a flexible, transparent Kapton foil using heterophase inks developed in Instytut Technologii Materiałów Elektronicznych (ITME) for the purpose of this research based on graphene and silver nanoparticles. Findings – A microwave module was printed using two types of Inkjet printers – PixDro LP50 with KonicaMinolta 512 printhead – and developed in an Instytut Tele- i Radiotechniczny (ITR) laboratory printer using MicroDrop a 100-μm glass nozzle printhead. Fully printed microwave circuits were evaluated by their print quality and electrical properties. Originality/value – Fully Inkjet printed microwave circuits using the heterophase graphene ink were evaluated by their print quality and electrical properties.

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23

Xiu, Xiao Jie, e Hong Jun Tang. "Automatic Block Detection for Ink Jet Head". Applied Mechanics and Materials 310 (fevereiro de 2013): 424–27. http://dx.doi.org/10.4028/www.scientific.net/amm.310.424.

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Inkjet printing technology has been used in several areas and the inkjet printer uses different inks, for example oil ink for cloth printing, color glaze ink for ceramic printing and so on. The printer ink jet head uses these inks are blocked frequently. An automatic block detection system has been presented in this paper. The system provides droplet deposition apparatus comprising of: a fluid chamber; a nozzle in fluid communication with the chamber for ejection of fluid; a monitor; CCD camera; image capturing and processing module. The system has applied to ink jet and droplet image detection and it is proved effective and the detection result is accuracy.

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Yang, K.-S., I.-Y. Chen e C.-C. Wang. "A numerical study of inkjet refilling". Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 218, n.º 12 (1 de dezembro de 2004): 1481–97. http://dx.doi.org/10.1243/0954406042690533.

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A numerical study is conducted to examine the flow characteristics of the inkjet printer head with special attention made to the refilling process. By solving the full set of three-dimensional transient Navier-Stokes equations and considering the process of bubble growth and collapse as a movable membrane, the fluid flow inside the channel and the ejected droplet from the nozzle can be modelled. The calculated results indicate that the single refilling channel design provides the fastest refilling rate but also reveals pronounced flow surge/overshot phenomena. By using a double refilling channel design, the flow surge/overshot phenomenon can be reduced considerably owing to the imposed friction. Moreover, the flooding phenomenon is much less pronounced. However, placing an additional cylinder obstacle in the single filling channel will not reduce the flow surge/overshot phenomenon.

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Lee, Ayoung, Kai Sudau, Kyung Hyun Ahn, Seung Jong Lee e Norbert Willenbacher. "Optimization of Experimental Parameters to Suppress Nozzle Clogging in Inkjet Printing". Industrial & Engineering Chemistry Research 51, n.º 40 (25 de setembro de 2012): 13195–204. http://dx.doi.org/10.1021/ie301403g.

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Yi, Maocong, Jianbo Feng, Zhifu Yin e Helin Zou. "Fabricating method of SU-8 photoresist conical nozzle for inkjet printhead". Materials and Manufacturing Processes 33, n.º 8 (18 de setembro de 2017): 898–904. http://dx.doi.org/10.1080/10426914.2017.1364848.

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Lee, Soo-Hong, Xuan Hung Nguyen e Han Seo Ko. "Study on droplet formation with surface tension for electrohydrodynamic inkjet nozzle". Journal of Mechanical Science and Technology 26, n.º 5 (maio de 2012): 1403–8. http://dx.doi.org/10.1007/s12206-012-0301-y.

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Peelamedu, S. M., C. B. Kosaraju, R. V. Dukkipati e N. G. Naganathan. "Numerical approach for axisymmetric piezoceramic geometries towards fluid control applications". Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering 214, n.º 2 (1 de março de 2000): 87–97. http://dx.doi.org/10.1243/0959651001540834.

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Piezoceramics have been increasingly popular and utilized for the purpose of micro-actuation. The choice of material internal poling directions for such geometries depends upon the type of actuation desired in each application. There are no generalized analysis procedures that have been developed to be able to predict the response of such actuator geometries. In this work, a finite element model has been developed to analyse axisymmetric piezoceramic actuators with arbitrary internal poling. The finite element methodology is verified by demonstrating favourable agreement between the numerical results obtained in this study with the results published for an inkjet printer application. In addition, the design of a piezoceramic nozzle is investigated with both single-layer and stacked axisymmetric piezoceramic geometries. Such piezoceramic nozzles and orifices can be effectively employed in various sensitive fluid control applications.

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Zhang, Wan, Xian Fu Wei, Bei Qing Huang e Liang Zhao. "The Effect of UV Inkjet Ink’s Performance on the Line Printing Quality". Applied Mechanics and Materials 262 (dezembro de 2012): 273–77. http://dx.doi.org/10.4028/www.scientific.net/amm.262.273.

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In order to smoothly jet from the nozzle, UV inkjet ink need to meet certain performance requirements, the surface tension of ink has certain effect on the formation and the flight path of ink droplet, directly affect the final printing quality. The black UV inkjet ink samples were prepared by selecting 5 kinds of surfactants, the surface tension was tested. The effect of the surface tension on ink droplet status and final line printing quality were studied. The results show that the surface tension of ink is different, the ink droplet status is different; the surface tension of ink have certain effect on the line width and density of lines, and have little impact on the roughness and contrast of lines.

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Kungurtsev, Petr V., e Matthew P. Juniper. "Adjoint-based shape optimization of the microchannels in an inkjet printhead". Journal of Fluid Mechanics 871 (17 de maio de 2019): 113–38. http://dx.doi.org/10.1017/jfm.2019.271.

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In drop-on-demand inkjet printheads, ink is pumped steadily through small channels, each of which contains an actuator and a nozzle. When an actuator pulses, a droplet is forced through the nozzle, after which acoustic oscillations reverberate within the channel. Manufacturers would like to damp the residual reverberations, without increasing the pressure drop required to drive the steady flow. In this paper we use gradient-based optimization to show that this can be achieved by constricting the channel where the acoustic velocity is largest and enlarging the channel where the acoustic velocity is smallest. This increases the viscothermal dissipation of the acoustics without changing the viscous dissipation of the steady flow. We separate the compressible Navier–Stokes equations into equations for a steady flow with no oscillations and equations for oscillations with no steady flow. We define two objective functions: the viscous dissipation of the steady flow and the dissipation of the oscillations. We then derive the adjoints for both sets of equations, and obtain expressions for the gradient of each objective function with respect to boundary deformations in Hadamard form. We combine these with a gradient-based optimization algorithm, incorporating constraints such as the shapes of the actuator and nozzle. This algorithm quickly converges to a design that has the same viscous dissipation for the steady flow but a 50 % larger decay rate for the oscillating flow. We show that this design is nearly optimal. It is a shape that inkjet manufacturers, using physical insight and trial and error, have probably not yet considered. We also show how the adjoint fields provide physical insight into the mechanisms affecting each objective function. The main requirements of this method are that the steady flow Mach number and oscillating flow Mach number are small, and that dissipation is dominated by thermoviscous mechanisms. These requirements are often satisfied in microfluidics, so the method in this paper could be applied to many other applications.

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Dybowska-Sarapuk, Lucja, Konrad Kielbasinski, Aneta Arazna, Konrad Futera, Andrzej Skalski, Daniel Janczak, Marcin Sloma e Malgorzata Jakubowska. "Efficient Inkjet Printing of Graphene-Based Elements: Influence of Dispersing Agent on Ink Viscosity". Nanomaterials 8, n.º 8 (8 de agosto de 2018): 602. http://dx.doi.org/10.3390/nano8080602.

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Inkjet printing is an excellent printing technique and an attractive alternative to conventional technologies for the production of flexible, low-cost microelectronic devices. Among many parameters that have a significant impact on the correctness of the printing process, the most important is ink viscosity. During the printing process, the ink is influenced by different strains and forces, which significantly change the printing results. The authors present a model and calculations referring to the shear rate of ink in an inkjet printer nozzle. Supporting experiments were conducted, proving the model assumptions for two different ink formulations: initial ink and with the addition of a dispersing agent. The most important findings are summarized by the process window regime of parameters, which is much broader for the inks with a dispersing agent. Such inks exhibit preferable viscosity, better print-ability, and higher path quality with lower resistivity. Presented results allow stating that proper, stable graphene inks adjusted for inkjet technique rheology must contain modifiers such as dispersing agents to be effectively printed.

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Wang, Kun, e Juntong Xi. "Optimization of the driving waveform of a piezoelectric inkjet printhead based on a system dynamics model". Rapid Prototyping Journal 24, n.º 8 (12 de novembro de 2018): 1272–80. http://dx.doi.org/10.1108/rpj-05-2017-0102.

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Purpose This paper aims to present an optimization method of the input driving signal of a piezoelectric inkjet printhead to improve droplet consistency and increase jetting frequency. Design/methodology/approach The optimization target is the transient pressure in the nozzle caused by the input driving signal, which directly generates the droplets. After demonstrating the linearity of the driving input and system pressure, an analytic model as a transfer function was developed, allowing calculation of the pressure vibration in the nozzle for an arbitrary input. Different patterns of input signal were parameterized and applied into the optimizing function, which represents the difference between the ideal and the actual pressure vibration. By determining the function minimum, the optimized parameters of the input signal were estimated. Findings Optimization results of different input patterns were compared and verified by the numerical model of the printhead, and it was revealed that the optimization method that combined the quenching pulse and an increased falling time interval was more effective than use of a single method. Originality/value After the process of optimization, a new type of input signal to the piezoelectric inkjet printhead was showed. By this method, the frequency of the printhead could be increased without losing consistency of droplets.

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Shen, S. C., C. T. Pan, Y. R. Wang e C. C. Chang. "Fabrication of integrated nozzle plates for inkjet print head using microinjection process". Sensors and Actuators A: Physical 127, n.º 2 (março de 2006): 241–47. http://dx.doi.org/10.1016/j.sna.2005.08.016.

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Tamura, Hikaru, Kazunori Kadota, Yoshiyuki Shirakawa, Yuichi Tozuka, Atsuko Shimosaka e Jusuke Hidaka. "Morphology control of amino acid particles in interfacial crystallization using inkjet nozzle". Advanced Powder Technology 25, n.º 3 (maio de 2014): 847–52. http://dx.doi.org/10.1016/j.apt.2013.12.010.

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Biswas, Adrija, e Shibendu Shekhar Roy. "A review on multi nozzle electrohydrodynamic inkjet printing system for MEMS applications". IOP Conference Series: Materials Science and Engineering 1136, n.º 1 (1 de junho de 2021): 012015. http://dx.doi.org/10.1088/1757-899x/1136/1/012015.

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36

Tofan, Tim, Harald Kruggel-Emden, Vytautas Turla e Raimondas Jasevičius. "Numerical Modeling of the Motion and Interaction of a Droplet of an Inkjet Printing Process with a Flat Surface". Applied Sciences 11, n.º 2 (7 de janeiro de 2021): 527. http://dx.doi.org/10.3390/app11020527.

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The numerical simulation and analysis of the ejection of an ink droplet through a nozzle as well its motion through air until its contact with a surface and taking up of a stable form is performed. The fluid flow is modeled by the incompressible Navier–Stokes equations with added surface tension. The presented model can be solved using either a level set or a phase field method to track the fluid interface. Here, the level set method is used to determinate the interface between ink and air. The presented work concentrates on the demonstration how to check the suitability of ink for inkjet printhead nozzles, for instance, for the use in printers. The results such as velocity, change of size, and volume dependence on time of an ink droplet are presented. Recommendations for the use of specific inks are also given.

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Tofan, Tim, Harald Kruggel-Emden, Vytautas Turla e Raimondas Jasevičius. "Numerical Modeling of the Motion and Interaction of a Droplet of an Inkjet Printing Process with a Flat Surface". Applied Sciences 11, n.º 2 (7 de janeiro de 2021): 527. http://dx.doi.org/10.3390/app11020527.

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The numerical simulation and analysis of the ejection of an ink droplet through a nozzle as well its motion through air until its contact with a surface and taking up of a stable form is performed. The fluid flow is modeled by the incompressible Navier–Stokes equations with added surface tension. The presented model can be solved using either a level set or a phase field method to track the fluid interface. Here, the level set method is used to determinate the interface between ink and air. The presented work concentrates on the demonstration how to check the suitability of ink for inkjet printhead nozzles, for instance, for the use in printers. The results such as velocity, change of size, and volume dependence on time of an ink droplet are presented. Recommendations for the use of specific inks are also given.

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38

Shen, Hongyao, Senxin Liu, Senyang Wu, Linchu Zhang e Jianfeng Sha. "Free-form surface-oriented five-axis single-point color printing technology". Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering 233, n.º 9 (10 de dezembro de 2018): 1159–71. http://dx.doi.org/10.1177/0959651818816486.

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Two-dimensional inkjet technology has made great progress in colorful plane printing. However, color printing technology for three-dimensional model is currently only at the exploratory stage; there are few reports on this issue. In this article, a free-form surface-oriented five-axis single-point printing technology with exclusive color nozzle is proposed. The single-point color nozzle consists of four print heads: prints cyan, magenta, yellow, and black pigment. For high-efficiency color printing, each print head prints on the same single point when the color nozzle moves along the surface. The method of color printing along the surface normal direction is proposed as normal direction printing mode. The algorithm of print point generation is introduced, and the path planning method of self-adaptive slicing and self-adaptive printing filling is proposed. In addition, a five-axis single-point printing platform is designed. Experiments are done to demonstrate the feasibility of the printing system.

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Wang, Zhen Ning, e Zheng Ning Tang. "Numerical Simulation of Droplet Formation of Piezoelectric Ink-Jet Printing". Advanced Materials Research 174 (dezembro de 2010): 191–94. http://dx.doi.org/10.4028/www.scientific.net/amr.174.191.

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The thesis adopts the numerical simulation method to simulate the formation and fall of water droplets from the nozzle exit. The numerical model is established based on piezoelectric inkjet theory, then the simulated results are analyzed which includes several stages in the entire course of droplet’s motion. The result indicates numerical simulation is suitable for researching the formation and fall of droplets and can provide a good basis for predicting the quality of ink-jet printing.

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Takagi, Daisuke, Waka Lin, Takahiko Matsumoto, Hidekazu Yaginuma, Natsuko Hemmi, Shigeo Hatada e Manabu Seo. "High-precision 3D inkjet technology for live cell bioprinting". International Journal of Bioprinting 5, n.º 2 (17 de junho de 2019): 27. http://dx.doi.org/10.18063/ijb.v5i2.208.

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In recent years, bioprinting has emerged as a promising technology for the construction of three-dimensional (3D) tissues to be used in regenerative medicine or in vitro screening applications. In the present study, we present the development of an inkjet-based bioprinting system to arrange multiple cells and materials precisely into structurally organized constructs. A novel inkjet printhead has been specially designed for live cell ejection. Droplet formation is powered by piezoelectric membrane vibrations coupled with mixing movements to prevent cell sedimentation at the nozzle. Stable drop-on-demand dispensing and cell viability were validated over an adequately long time to allow the fabrication of 3D tissues. Reliable control of cell number and spatial positioning was demonstrated using two separate suspensions with different cell types printed sequentially. Finally, a process for constructing stratified Mille-Feuille-like 3D structures is proposed by alternately superimposing cell suspensions and hydrogel layers with a controlled vertical resolution. The results show that inkjet technology is effective for both two-dimensional patterning and 3D multilayering and has the potential to facilitate the achievement of live cell bioprinting with an unprecedented level of precision.

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Choi, Ju-Hwan, Ju-Hun Ahn e Chang-Yull Lee. "Flexible Structural Color Films Based on Electro-Hydrodynamic Inkjet Printing". Coatings 11, n.º 3 (26 de fevereiro de 2021): 277. http://dx.doi.org/10.3390/coatings11030277.

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Structural coloration based on nanostructures is one of the alternatives that can prevent environmental pollution compared to the use of chemically synthesized materials. This technique has attracted considerable attention for various applications, including displays and sensors. In this study, a photonic crystal structure based on spherical silica was formed to provide structural color using an electro-hydrodynamic (EHD) equipment, a printed electronic system attracting considerable interest. The EHD inkjet printing equipment could print micro- and nanostructures using the voltage applied between the nozzle and substrate. Silica-based ink samples were prepared for use in the EHD equipment. Appropriate printing parameters for the EHD inkjet printing were set using the prepared sample. Spherical silica was printed on a polyimide (PI) film layer. The spherical silica nanoparticles discharged during the EHD inkjet printing were not deformed by the EHD process. A photonic crystal structure was formed on a polydimethylsiloxane (PDMS) layer by EHD printing by covering the PDMS layer on the PI film. The spherical-silica-based photonic crystal structure formed on the PDMS layer with elasticity and flexibility exhibited a color change with bending loads.

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Kwon, Dae Hee, e Sang Joon Lee. "Axis-switching of non-axisymmetric microdroplet ejected from inkjet with an elliptical nozzle". Physics of Fluids 23, n.º 5 (maio de 2011): 051703. http://dx.doi.org/10.1063/1.3584001.

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Nakanishi, Tameo, Masami Nakano e Hiroki Tsunokake. "0114 Influence of Nozzle Shape on Droplet Formation Patterns of a Continuous Inkjet". Proceedings of the Fluids engineering conference 2010 (2010): 33–34. http://dx.doi.org/10.1299/jsmefed.2010.33.

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Cao, Xianghong, Yun Ye, Xin Liu, Tailiang Guo e Qian Tang. "54.3: Realization of Uniform OLED Pixels based on Multi‐nozzle by Inkjet printing". SID Symposium Digest of Technical Papers 52, S1 (fevereiro de 2021): 395–97. http://dx.doi.org/10.1002/sdtp.14499.

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OKANO, Mamoru, Tomohiro INOUE, Yoshiharu TAKIZAWA e Tadayuki MATSUDA. "IMG-01 DEVELOPMENT OF NEW NOZZLE FOR CONTINUOUS INKJET PRINTERS(Imaging and Printing Technologies I,Technical Program of Oral Presentations)". Proceedings of JSME-IIP/ASME-ISPS Joint Conference on Micromechatronics for Information and Precision Equipment : IIP/ISPS joint MIPE 2009 (2009): 243–44. http://dx.doi.org/10.1299/jsmemipe.2009.243.

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Shin, Dong-Youn, Paul Grassia e Brian Derby. "Oscillatory Incompressible Fluid Flow in a Tapered Tube With a Free Surface in an Inkjet Print Head". Journal of Fluids Engineering 127, n.º 1 (1 de janeiro de 2005): 98–109. http://dx.doi.org/10.1115/1.1852474.

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Oscillatory incompressible fluid flow with a free surface occurs in an inkjet print head. Due to complex physical fluid behavior, numerical simulations have been a common approach to characterize the pressure and velocity development in time and space. However, the cost of a numerical approach is high in terms of computational time such that approximate analytic approaches have been developed. In this paper, an approximate analytic solution for a tapered nozzle section is described with a proper downstream boundary condition and the physical behavior of the meniscus deformation is modeled with a simple “window” theory.

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Morita, Naoki. "Acoustic Behaviors of a Continuous Inkjet Multi-Nozzle Printhead Driven by a Traveling Wave". Journal of Imaging Science and Technology 61, n.º 3 (1 de maio de 2017): 305061–66. http://dx.doi.org/10.2352/j.imagingsci.technol.2017.61.3.030506.

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Kwon, Kye-Si, Yun-Sik Choi, Dae-Yong Lee, Jeong-Seon Kim e Dae-Sung Kim. "Low-cost and high speed monitoring system for a multi-nozzle piezo inkjet head". Sensors and Actuators A: Physical 180 (junho de 2012): 154–65. http://dx.doi.org/10.1016/j.sna.2012.04.009.

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Liou, Tong-Miin, Chia-Yen Chan e Kuan-Cheng Shih. "Effects of actuating waveform, ink property, and nozzle size on piezoelectrically driven inkjet droplets". Microfluidics and Nanofluidics 8, n.º 5 (7 de agosto de 2009): 575–86. http://dx.doi.org/10.1007/s10404-009-0488-4.

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Khan, Arshad, Khalid Rahman, Dong Soo Kim e Kyung Hyun Choi. "Direct printing of copper conductive micro-tracks by multi-nozzle electrohydrodynamic inkjet printing process". Journal of Materials Processing Technology 212, n.º 3 (março de 2012): 700–706. http://dx.doi.org/10.1016/j.jmatprotec.2011.10.024.

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