Journal articles: 'Jetting method'

1

Benoît, Jean, Michael J. Atwood, R. Craig Findlay, and Brian D. Hilliard. "Evaluation of jetting insertion for the self-boring pressuremeter." Canadian Geotechnical Journal 32, no. 1 (February 1, 1995): 22–39. http://dx.doi.org/10.1139/t95-003.

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The primary objectives of the self-boring pressuremeter (SPBM) test are to measure, in situ, the horizontal stress and the stress–strain characteristics of soils and soft rocks. This cylindrical probe tunnels itself into the ground with a minimum disturbance. Conventionally, the advance has been performed using a cutter system housed inside a cutting shoe. Although proven effective, this method is slow and cumbersome. In response to these drawbacks, a jetting insertion method was introduced and designed to allow a faster rate of insertion using a system that is less equipment intensive and easily adapted to conventional drill rigs. To avoid similar potential inconsistencies encountered in earlier SBPM testing with the cutting method, a series of laboratory simulation tests and in situ self-boring pressuremeter tests were carried out in two soft clay deposits to assess the jetting method. The following key insertion parameters were studied: jetting nozzle type, drilling fluid velocity, jetting nozzle position, rate of advance, and jetting flushing system. The results of this study indicate that, as with the cutting method, the jetting method can be used in soft to medium clays to advance the self-boring pressuremeter with minimum disturbance. Key words : self-boring pressuremeter, soft clay, horizontal stress, jetting, cutting.

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Xu, G. H., Z. Q. Yue, D. F. Liu, and F. R. He. "Grouted jetted precast concrete sheet piles: Method, experiments, and applications." Canadian Geotechnical Journal 43, no. 12 (December 1, 2006): 1358–73. http://dx.doi.org/10.1139/t06-094.

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This paper introduces an innovative technology—grouted jetted precast concrete piling—that increases the efficiency of piling operations in coastal regions. The technology includes the following steps: (i) casting concrete piles factory-designed especially for jetting and grouting; (ii) jetting to drive the concrete piles with a crane on a floating ship or platform into soil; and (iii) grouting to enhance the sheet pile connections and to increase the pile bearing capacity. This technology was applied to a number of piling construction projects at the mouth of the Yellow River Delta in China, and this experience demonstrated that it is a robust, fast track, cost-effective, and environmentally friendly piling method.Key words: piling technique, sheet pile, jetting, retaining walls, coastal infrastructure, Yellow River.

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GUSHIMA, Kazuya, and Hiroshi SAKAMOTO. "Investigation of Jetting Detection Method in the Ceramic Particles Jetting of Rolling Stock." Proceedings of Mechanical Engineering Congress, Japan 2019 (2019): J18107. http://dx.doi.org/10.1299/jsmemecj.2019.j18107.

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Zhan, Hong-wu, Fang Xu, and Ling-feng Lu. "Researches on the Observation on the Jetting of Liquid of High Viscosity and Droplet Control." Open Mechanical Engineering Journal 9, no. 1 (October 7, 2015): 812–19. http://dx.doi.org/10.2174/1874155x01509010812.

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Valve regulated droplet jetting is an important method for the generation of liquid droplet of high viscosity. Based on learning from piezoelectric micro-droplet jetting mechanism and researching methods, theoretical analysis and simulation were conducted on the factors affecting the micro-droplet jetting volume, and the qualitative relationship between the size of the jetted droplet and the feed pressure and striker stroke so as to guide the designing of the structure of the pneumatic valve control type nozzle and design the droplet jetting system and observation experiment platform based on stroboscopic techniques. Different jetting parameters was changed according to the results of the theoretical analysis for the conduction of jetting experiment, and several glycerin solutions at different solutions were taken as the working liquid for studying the effect of the several factors like feed pressure, pulse driving pressure, driving pulse width, and striker stroke. The striker would not be lifted to an ultimate position through controlling the pulse air pressure or driving pulse width so as to be able to jet extremely tiny droplet, but this is of rather bad stability. It is the most effective, stable and optimized method to control the striker stroke so as to change the diameter and shapes of the droplets.

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BORKOWSKI, P. "Hydro-jetting method of bas-relief shaping." Archives of Civil and Mechanical Engineering 11, no. 2 (January 2011): 267–76. http://dx.doi.org/10.1016/s1644-9665(12)60142-3.

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Jiong, Li, Yang Weidong, Liu Libing, and Yan Yongnian. "Jetting method in patternless casting manufacturing technique." Tsinghua Science and Technology 14, S1 (June 2009): 175–79. http://dx.doi.org/10.1016/s1007-0214(09)70088-4.

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Shrestha, Sanjay, and Guha Manogharan. "Optimization of Binder Jetting Using Taguchi Method." JOM 69, no. 3 (January 3, 2017): 491–97. http://dx.doi.org/10.1007/s11837-016-2231-4.

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Liu, Fei, Kang Qin, and Yongsheng Han. "Simplified Method for Consolidation Settlement Calculation of Combined Composite Foundation." Shock and Vibration 2020 (November 30, 2020): 1–7. http://dx.doi.org/10.1155/2020/8818161.

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Treating weak saturated soil foundation by drainage powder jetting pile foundation can not only increase the bearing capacity of the foundation but also accelerate the drainage and consolidation process of the foundation. Having been commonly used in engineering, the plum blossom pile layout scheme is based on the foundation axisymmetric consolidation model (the powder jetting pile is the model center and the drainage board is located at the outer boundary of the model). It adopts reasonable boundary conditions and foundation seepage conditions and the method of pile-soil composite modulus and obtains the expression of the average excess pore water pressure of the composite foundation of the instantaneous loading of the drainage powder jetting pile under the simplified model. Therefore, the average consolidation degree of the foundation is acquired. The expression of the average consolidation degree can comprehensively reflect factors such as pile-soil modulus ratio, displacement ratio, drain spacing ratio, and those which affect the consolidation process of the foundation. The obtained analytical solution is of certain practical application significance for the consolidation settlement calculation of such engineering.

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Li, Ji-Hong, Mun-Jik Lee, Hyungjoo Kang, Min-Gyu Kim, and Gun Cho. "Design, Performance Evaluation and Field Test of a Water Jet Tool for ROV Trencher." Journal of Marine Science and Engineering 9, no. 3 (March 8, 2021): 296. http://dx.doi.org/10.3390/jmse9030296.

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ROV trencher is a kind of ROV which trenches the sea floor using a specifically designed tool and buries the subsea cables and pipelines. According to the soil conditions, this trenching method can have two different types, one is mechanical cutting and the other one is water jetting. In this paper, we present a water jet tool design method for a 2500 m depth-rated ROV trencher. A series of CFD simulations and laboratory tests with one nozzle, and a ground test using 1:6 scale jetting arm model were carried out to derive and demonstrate the jetting tool design parameters. In October 2018, the constructed ROV trencher was put into the sea trial in the East Sea of Korea to evaluate its final performances. In addition, in December 2019, the trencher was applied in a construction site to bury subsea water pipelines near the Yogji Island in the Korea. Through these two field tests and operation, the trencher was demonstrated for both its operational capability and trenching performance. The main contribution of this paper is that it presents the entire design procedures of water jet tools, including CFD simulations, laboratory tests, field test with 1:6 scaled jetting tool, and the final prototype tool design. These consecutive procedures are carried out in order for us to set up sort of relationship between jetting angle, trench depth, trench speed, and jetting power, from which we can predict and evaluate the trenching performance of the prototype jetting tool.

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Feng, Chao, Yongnian Yan, and Renji Zhang. "Comparison and analysis of continuously jetting and discretely jetting method used in rapid ice prototype forming." Materials & Design 23, no. 1 (February 2002): 77–81. http://dx.doi.org/10.1016/s0261-3069(01)00045-0.

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Sun, Huaiyuan, Qingqing Gu, Yuehua Liao, and Chenjie Sun. "Research of Amoxicillin Microcapsules Preparation Playing Micro-Jetting Technology." Open Biomedical Engineering Journal 9, no. 1 (March 31, 2015): 115–20. http://dx.doi.org/10.2174/1874120701509010115.

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With polylactic-co-glycolic acid(PLGA) as shell material of microcapsule, amoxicillin as the model, poly(vinyl alcohol) and twain as surfactant, amoxicillin-PLGA microcapsules were manufactured using digital micro-jetting technology and a glass nozzle of 40μm diameter. The influences of the parameters of micro-jetting system on the mean grain size and size distribution of amoxicillin-PLGA microcapsules were studied with single factor analysis and orthogonal experiment method, namely, PLGA solution concentration, driving voltage, jetting frequency, stirrer speed, etc. The optimal result was obtained; the form representation of microcapsule was analyzed as well. The results show that, under certain conditions of experimental drug prescription, driving voltage was proportional to the particle size; jetting frequency and stirrer speed were inversely proportional. When the PLGA concentration for 3%, driving voltage for 80V, the jetting frequency for 10000Hz and the stirrer speed for 750rpm, the particles were in an ideal state with the mean grain size of 60.246μm, the encapsulation efficiency reached 62.39％ and 2.1％ for drug loading.

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12

Zhang, Lue, Hong Hu, and Yong Cao. "Droplet Generation and Piezoceramic Actuation of a Jetting Inker." Key Engineering Materials 480-481 (June 2011): 574–79. http://dx.doi.org/10.4028/www.scientific.net/kem.480-481.574.

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To reveal the jetting of fine drops, model of 2-phase flow between gas and liquid is offered based on volume of fluid method. Numerical simulation is launched for the droplet generation through narrow nozzle, and key factors are discussed. Aiming at the ink marking of defective dies in IC production, a jetting inker driven by piezoceramic stacks is developed. The actuation properties are derived; waveform of induced pressure at nozzle entrance is estimated, which coincides the numerical results. Performance of ink dot jetting is evaluated and simulation results are verified.

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Xiao, Xingzhi, Gang Li, Tingting Liu, and Mingfei Gu. "Experimental Study of the Jetting Behavior of High-Viscosity Nanosilver Inks in Inkjet-Based 3D Printing." Nanomaterials 12, no. 17 (September 5, 2022): 3076. http://dx.doi.org/10.3390/nano12173076.

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Inkjet printing of high-viscosity (up to 105 mPa·s) nanosilver inks is an interesting emerging technology to achieve the 3D fully printed fabrication of electronic products. The highly viscous force of the ink makes it impossible to achieve droplet ejection with the traditional piezoelectric-driven drop-on-demand inkjet method. In this study, a pneumatic needle jetting valve is adopted to provide sufficient driving force. A large number of high-viscosity inkjet printing tests are carried out, and the jetting behavior is recorded with a high-speed camera. Different jetting states are determined according to the recorded images, and the causes of their formation are revealed. Additionally, the effects of the operating pressure, preload angle, and fluid pressure on jetting states are elucidated. Furthermore, the jetting phase diagram is obtained with the characterization of the Reynolds number and the printable region is clarified. This provides a better understanding of high-viscosity inkjet printing and will promote the application of high-viscosity inkjet printing in 3D fully printed electronic products.

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14

Chen, Yujia, Maoxuan Cai, Shixun Zhang, Na Zhang, and Wei Cao. "Vacuum Filling Simulation with Combined Lagranian and VOF Method." Journal of Mechanical Materials and Mechanics Research 5, no. 1 (March 30, 2022): 1. http://dx.doi.org/10.30564/jmmmr.v5i1.4511.

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Jetting succeeded by accumulation is the characteristic of the vacuum filling, which is different from the conventional pressure-driven flow. In order to simulate this kind of flow, a three-dimensional theoretical model in terms of incompressible and viscous flow is established, and an iterative method combined with finite element method (FEM) is proposed to solve the flow problem. The Lagranian-VOF method is constructed to trace the jetting and accumulated flow fronts. Based on the proposed model and algorithm, a simulation program is developed to predict the velocity, pressure, temperature, and advancement progress. To validate the model and algorithm, a visual experimental equipment for vacuum filling is designed and construted. The vacuum filling experiments with different viscous materials and negative pressures were conducted and compared the corresponding simulations. The results show the flow front shape closely depends on the fluid viscosity and less relates to the vacuum pressure.

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15

Gardan, Julien. "Method for characterization and enhancement of 3D printing by binder jetting applied to the textures quality." Assembly Automation 37, no. 2 (April 3, 2017): 162–69. http://dx.doi.org/10.1108/aa-01-2016-007.

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Purpose This paper aims to present a technical approach to evaluate the quality of textures obtained by an inkjet during binder jetting in 3D printing on a powder bed through contours detection to improve the quality of the surface printed according to the result of the assembly between the inkjet and a granular product. Design/methodology/approach The manufacturing process is based on the use of computer-aided design and a 3D printer via binder jetting. Image processing measures the edge deviation of a texture on the granular surface with the possibility of implementing a correction in an active assembly through a “design for manufacturing” (DFM) approach. Example application is presented through first tests. Findings This approach observes a shape alteration of the printed image on a 3D printed product, and the work used the image processing method to improve the model according to the DFM approach. Originality/value This paper introduces a solution for improving the texture quality on 3D printed products realized via binder jetting. The DFM approach proposes an active assembly by compensating the print errors in upstream of a product life cycle.

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Chen, Yao Yao, and De An Sun. "Numerical Analysis of MMP Piling with Wet-Jetting Method." Advanced Materials Research 446-449 (January 2012): 1718–22. http://dx.doi.org/10.4028/scientific5/amr.446-449.1718.

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Chen, Yao Yao, and De An Sun. "Numerical Analysis of MMP Piling with Wet-Jetting Method." Advanced Materials Research 446-449 (January 2012): 1718–22. http://dx.doi.org/10.4028/www.scientific.net/amr.446-449.1718.

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MMP pile is a method of foundation treatment, and driving pile brings the excess pore water pressure in the surrounding subgrade. By using a software ABAQUS to build a three-dimensional model, the process of MMP pile driven at a site of railway foundation in Shanghai is simulated using theory of Biot consolidation and modified Cam-clay model with three-dimension effect being considered. The changes in the excess pore pressure are obtained. Comparing the computed results with measured results in situ shows that the computed excess pore water pressure is consistency with that measured from in situ.

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Macovei, Gheorghe, and Viorel Paleu. "A Review on Tribological Behaviour of 3D Printed Mechanical Components." Bulletin of the Polytechnic Institute of Iași. Machine constructions Section 68, no. 3 (September 1, 2022): 41–56. http://dx.doi.org/10.2478/bipcm-2022-0024.

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Abstract Technologies such additive manufacturing are slowly becoming more and more present on the market, covering different areas of the industry due to its great potential. Even so, there are still many aspects which are unexplored or which can be improved. One of them being the study of the tribological proprieties for all these parts, which are produced through additive manufacturing methods, such as powder bed fusion, binder jetting, direct energy deposition, fused filament fabrication, material jetting, vat photopolymerization, and sheet lamination. The scope of this paper is to bring together the tribological proprieties for the 3D printed parts, and to have a critical analysis of these proprieties, in order to easily decide which printing method is suitable, depending of the working conditions of the printed component. In addition, this paper will describe the working principle for each technology, and the type of materials that are commonly used in the printing process. Depending of the printing method, the tribological proprieties vary greatly. For example, for the parts which are manufactured through powder bed fusion, it was found that the wear resistance is higher, and with a lower friction coefficient than for a part manufactured through traditional methods. In addition, for many printing methods, the produced part might require an additional step of treatment. This is the case with binder jetting, where infiltration and sintering are often used because the 3D-printed part is porous and weak. Some researchers found that the average friction coefficient measured for a steel-based part, treated with bronze infiltration, is comparable with the friction coefficient measured on a part made of the same material, manufactured through the direct energy deposition method. Of course, due to the physical limitations of the 3D printing method, the system will allow only the usage of a specific type or class of materials. One of such method is fused filament fabrication, where only thermoplastics are used. Along with vat photopolymerization and material jetting, these methods present comparable tribological proprieties.

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Revilla-Leon, Marta, Marina Olea-Vielba, Ana Esteso-Díaz, Iñaki Martinez-Klemm, Jose Manuel Reuss Rodriguez-Vilaboa, and Mutlu Özcan. "New fabrication method using additive manufacturing technologies for the pattern of pressed lithium disilicate onlay restorations." Brazilian Dental Science 20, no. 4 (December 20, 2017): 149. http://dx.doi.org/10.14295/bds.2017.v20i4.1364.

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There are 7 categories for the additive manufacturing (AM) technologies and a wide variety of materials that can be used to build a computer aided designed (CAD) 3-Dimensional (3D) object. The present article reviews the main AM processes for polymers for dental applications: stereolithography (SLA), direct light processing (DLP), material jetting (MJ) and material extrusion (ME). The manufacturing process, accuracy and precision of these methods will be reviewed, as well as, their prosthodontic applications. Keywords: 3D printing; Additive manufacturing technologies; Direct light processing; Fused deposition modelling; Material extrusion; Material jetting; Multijet printing; Prosthodontics; Stereolitography.

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Hu, Junfeng, and Xinying Zhao. "Design, modeling, and performance analysis of a new dispensing system based on compliant mechanism." Science Progress 103, no. 2 (April 2020): 003685042092389. http://dx.doi.org/10.1177/0036850420923892.

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Jet dispenser is widely used in microelectronic packaging, semiconductor industry, life science, and rapid manufacturing fields. As the requirement for dispensing accuracy and speed become higher and higher, especially for viscous materials, the traditional mechanisms cannot meet the high precision dispensing. This paper presents a new jetting dispenser using the complaint mechanism with amplifier components to design the dispenser, which gain the motion and force from the elastic deformation of flexible hinges. To describe the mechanical property of the jetting dispenser, the model of the jetting dispenser was built by employing a pseudo-rigid-body method. To predict accurately droplet volume, we established the model by describing the forming process of droplet. Furthermore, the errors of the droplet volume were analyzed based on the model. The prototype of the dispenser was built and the effects of driving voltage, radius of spray chamber, glue supply pressure, glue viscosity, and turn-on time of hammer on the droplet were analyzed experimentally. The analytical results are in good agreement with experimental results, which the advantages of the presented jetting dispenser with a new design concept are validated. This research provided a new idea and modeling method for the future application of the dispensing system.

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Huang, Wei Jun, and Qin Zhang. "Swirl-Based Non-Contact Method of Cell Orientation Control." Key Engineering Materials 609-610 (April 2014): 660–65. http://dx.doi.org/10.4028/www.scientific.net/kem.609-610.660.

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Orientation adjustment is an important issue in the micromanipulation of cells. A non-contact method based on a swirl for cell orientation control was introduced in this paper. The swirl is produced by a pair of opposite micro-fluids squirting from two parallel tubes. Cell orientation adjustment is realized by cells rotation due to swirl viscous drag, which drives cells to desired configurations. The appropriate distances between the end face of the two tubes and the distance between the axes of them are 1-3 times tube diameter for the cells rotating in the swirl central zone. Especially when the distances are kept double the cell diameter, cells rotate steadily round the swirl central point. By pulsating jetting, fluctuant micro-fluid are generated which make cell rotating a certain angle. Adjusting the pulse duration, pressure and jetting velocity, the cell rotation angle can be controlled which make orientation control more precisely. The method is valid for cells of different shapes and sizes. The effectiveness of the proposed non-contact method for cell configuration control was verified by experiments.

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Liang, Zhongwei, Xiaochu Liu, Guilin Wen, and Jinrui Xiao. "Effectiveness prediction of abrasive jetting stream of accelerator tank using normalized sparse autoencoder-adaptive neural fuzzy inference system." Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture 234, no. 13 (June 26, 2020): 1615–39. http://dx.doi.org/10.1177/0954405420927582.

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Abrasive jetting stream generated from accelerator tank is crucial to the precision machining of industrial products during the process of strengthen jet grinding. In this article, its effectiveness prediction using normalized sparse autoencoder-adaptive neural fuzzy inference system is carried out to provide an optimal result of jetting stream. A normalized sparse autoencoder-adaptive neural fuzzy inference system capable of calculating the concentration density of abrasive impact stress by normalized sparse autoencoder and identifying the effectiveness indexes of abrasive jetting by adaptive neural fuzzy inference system is proposed to predict the stream effectiveness index in grinding practices, indicating that when turbulence root-mean-square velocity ( VRMS) is 420 m/s, turbulence intensity ( Ti) is 570, turbulence kinetic energy ( Tc) is 540 kJ, turbulence entropy ( Te) is 620 J/K, and Reynolds shear stress ( Rs) is 430 kPa (Error tolerance = ± 5%, the same as follows), the optimized effectiveness quality of abrasive jetting stream could be ensured. The effectiveness prediction involve the following steps: measuring the jet impact data on the interior boundary surface of accelerator tank, calculating the concentration density of abrasive impact stress, establishing the descriptive analytical frame work of normalized sparse autoencoder-adaptive neural fuzzy inference system, adaptive prediction of abrasive jetting stream effectiveness through normalized sparse autoencoder-adaptive neural fuzzy inference system computation, and performance verification of actual effectiveness prediction in the efficiency quantification and quality assessment when it compared to that of alternative approaches, such as genetic, simulated annealing–genetic algorithm, Taguchi, artificial neural network–simulated annealing, and genetically optimized neural network system methods. Objective of this research is to adaptive predict the abrasive jetting stream effectiveness using a new-proposed prediction system, a stable and reliable abrasive jetting stream therefore can be achieved using jetting pressure ( Pw) at 320 MPa, mass of cast steel grits ( Mc) at 270 g, mass of bearing steel grits ( Mb) at 310 g, mass of brown-fused alumina grits ( Ma) at 360 g, and mass rate of abrasives ( Fa) at 0.46 kg/min. It is concluded that normalized sparse autoencoder-adaptive neural fuzzy inference system owns an outstanding predictive capability and possesses a much better working advancement in typical calibration indexes of accuracy and efficiency, meanwhile a high agreement between the fuzzy predicted and actual measured values of effectiveness indexes is ensured. This novel method could be promoted constructively to improve the quality uniformity for abrasive jetting stream and to facilitate the productive managements of abrasive jet machining consequently.

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Wang, Ming Lu, Wei Qiang Wang, Yan Peng Qu, Yan Liu, and Zhi Yong Xu. "Supercritical Fluid Spray Dyeing: A New Method of Dyeing and Simulations of its Flow Field." Advanced Materials Research 396-398 (November 2011): 2038–43. http://dx.doi.org/10.4028/www.scientific.net/amr.396-398.2038.

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The supercritical fluid flow jetted out from a nozzle was divided into two stages, free jetting and passing through the porous media, in a supercritical spray dyeing process. According to the nature of the flow, the free jetting model and passing through porous media model were established separately. Based on the established models, the characteristics of supercritical fluid flow field in the supercritical fluid spray dyeing process were investigated firstly in this paper. Distributions of the temperature and pressure and their influencing factors in the flow field, which are the determinants of the spray dyeing process, were obtained and analyzed. Besides, the mass flow and covering diameter sprayed by supercritical fluid were studied. The simulating analysis may provide a theoretical basis and guidance for the actual process of supercritical fluid spray dyeing.

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Xie, Peng Cheng, Bin Du, Zhi Yun Yan, Yu Mei Ding, and Wei Min Yang. "Visual Experiment Study on the Influence of Mold Structure Design on Injection Molding Product’s Defects." Advanced Materials Research 87-88 (December 2009): 31–35. http://dx.doi.org/10.4028/www.scientific.net/amr.87-88.31.

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Injection molding visualization is the experimental method of direct observation on the melt filling behavior in the mold cavity. By using developed visualization system, the influence of mold structure design on the injection molding product’s defects, such as jetting and weld were studied in this paper. The forming process of jetting was observed by the visual method, and results show that it is useful to avoid jetting by locating gate correctly. According to the generation of weld line in single gate cavity, an improved measure to adjust the weld locations by adding overflow traps was proposed. The result indicates that the overflow trap is good for adjusting weld location and makes the defects appear in the unimportant points of surface. Another experiment on the forming process of weld line in two-gate cavity with setting different distance parameters were carried out. The result shows that increasing of gates distance may significantly affect the performance of weld line.

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Bagazeev, Viktor, Niyaz Valiev, Konstantin Kokarev, and Vasiliy Startsev. "Method of placer mining by directional well drilling." E3S Web of Conferences 56 (2018): 01022. http://dx.doi.org/10.1051/e3sconf/20185601022.

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The study aims at justifying the method for the development of placers by directed drilling of wells. A description is given of the opening of the site, the receding and oncoming scheme of the digging excavation, drilling and expansion of the wells, the main hydraulic unit with remote control. The physics-mechanical substantiation of technological parameters is given: hydro-jet erosion, the shape and size of the cleaning chambers, the adaptation of hydrotransport calculation methods. With jetting, the required flow rate and pressure of water to break rocks is based on the laws of soil mechanics. The parameters of the clearing space and the shape of the chambers are taken in accordance with the magnitude of the vault of natural equilibrium. As a determining factor in the calculation of gravity hydrotransport, the consistency of the pulp is adopted with observance of the condition necessary for the bearing capacity. To adapt the methodology for calculating the hydraulic lifting of pulp to the conditions of well development, the coefficient of dilution is taken as the main design parameter. Modeling of jetting jet in the laboratory conditions was carried out, dependences of decrease in axial pressure were obtained at removal of the face from the nozzle.

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Campbell, N. J., P. D. Hanrahan, I. M. Russell, G. S. Roberts, and B. J. Horton. "Modelling pesticide residues on greasy wool: experimental studies." Australian Journal of Experimental Agriculture 38, no. 5 (1998): 441. http://dx.doi.org/10.1071/ea98047.

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Summary. A model has been fitted to results from experimental application of organophosphates, synthetic pyrethroids and insect growth regulators to sheep mostly in long wool. The model relates the rate of breakdown of pesticide to the chemical used, the method of application and the length of wool at the time of treatment. A genetic algorithm was used to combine a range of experimental results for each chemical group to determine the rate of breakdown, and also the effect of application method and length of wool on breakdown. Organophosphates break down very quickly when applied to the surface of the wool (initial half-lives of 9–12 days), but the rate of breakdown gradually slows as the proportion of pesticide near the surface of the wool decreases. When the pesticide is applied deep into the wool by hand jetting or dipping, the rate of breakdown is slower (average half-lives of 27–42 days) and more uniform. Synthetic pyrethroids applied by hand jetting or backliner to sheep with 6–9 months wool growth initially break down with half-lives of 32–39 days, but the rate of breakdown decreases to 59–215 days giving average half-lives of 48–103 days over the 3–6 months between application and shearing. Cyromazine applied by hand jetting to sheep with 6–8 months wool growth has an average half-life of 79–96 days, but less if applied by automatic jetting race. The other insect growth regulators have longer half-lives: triflumuron, off-shears backliner, 119 days; and diflubenzuron, long wool jetting on to 7–9 months wool, >119 days. The model allows for different breakdown rates due to the method of application and length of wool and for changes in the rate of breakdown between application and shearing. It can be used to estimate the expected residue on wool at any time after a specified treatment, provided the amount of chemical applied is known. Conversely, the amount applied can be estimated from the residue and treatment details.

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Refino, Andam, Hadi Teguh Yudistira, Denny H. T. Nugroho, and Deska L. Puspitarum. "Numerical Investigation of Electrospray Working Performance on Ethanol." Journal of Science and Applicative Technology 3, no. 2 (December 31, 2019): 51. http://dx.doi.org/10.35472/jsat.v3i2.196.

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Electrospray as an alternative method to fabricate thin film is studied. High voltage is required by the electrospray system. The requirement of high voltage is different for various liquid depending on the surface tension property. Ethanol was used to resemble the solvent used in thin film deposition. From the experimental work, jetting performance did not occur despite of the high applied voltage which is around 1 KV. In this work, numerical calculation is carried out to find the reason behind of unsuccessful jetting at 1 KV applied voltage. The percentage of Rayleigh limit is around 0.4. Electrospray performance at walking distance 5 mm using ethanol is predicted to be stable when the applied high voltage is approximately 1.1 KV. The numerical investigation indicates that the jetting performance will occur if the applied voltage is more than 1.1 KV.

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Hartmann, Christoph, Lucas van den Bosch, Johannes Spiegel, Dominik Rumschöttel, and Daniel Günther. "Removal of Stair-Step Effects in Binder Jetting Additive Manufacturing Using Grayscale and Dithering-Based Droplet Distribution." Materials 15, no. 11 (May 26, 2022): 3798. http://dx.doi.org/10.3390/ma15113798.

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Binder jetting is a layer-based additive manufacturing process for three-dimensional parts in which a print head selectively deposits binder onto a thin layer of powder. After the deposition of the binder, a new layer of powder is applied. This process repeats to create three-dimensional parts. The binder jetting principle can be adapted to many different materials. Its advantages are the high productivity and the high degree of freedom of design without the need for support structures. In this work, the combination of binder jetting and casting is utilized to fabricate metal parts. However, the achieved properties of binder jetting parts limit the potential of this technology, specifically regarding surface quality. The most apparent surface phenomenon is the so-called stair-step effect. It is considered an inherent feature of the process and only treatable by post-processing. This paper presents a method to remove the stair-step effect entirely in a binder jetting process. The result is achieved by controlling the binder saturation of the individual voxel volumes by either over or underfilling them. The saturation is controlled by droplet size variation as well as dithering, creating a controlled migration of the binder between powder particles. This work applies the approach to silica sand particle material with an organic binder for casting molds and cores. The results prove the effectiveness of this approach and outline a field of research not identified previously.

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Yuan, Jiangping, Chen Chen, Danyang Yao, and Guangxue Chen. "3D Printing of Oil Paintings Based on Material Jetting and Its Reduction of Staircase Effect." Polymers 12, no. 11 (October 29, 2020): 2536. http://dx.doi.org/10.3390/polym12112536.

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Material jetting is a high-precision and fast 3D printing technique for color 3D objects reproduction, but it also suffers from color accuracy and jagged issues. The UV inks jetting processes based on the polymer jetting principle have been studied from printing materials regarding the parameters in the default layer order, which is prone to staircase effects. In this work, utilizing the Mimaki UV inks jetting system with a variable layer thickness, a new framework to print a photogrammetry-based oil painting 3D model has been proposed with the tunable coloring layer sequence to improve the jagged challenge between adjacent layers. Based on contour tracking, a height-rendering image of the oil painting model is generated, which is further segmented and pasted to the corresponding slicing layers to control the overall printing sequence of coloring layers and white layers. The final results show that photogrammetric models of oil paintings can be printed vividly by UV-curable color polymers, and that the proposed reverse-sequence printing method can significantly improve the staircase effect based on visual assessment and color difference. Finally, the case of polymer-based oil painting 3D printing provides new insights for optimizing color 3D printing processes based on other substrates and print accuracy to improve the corresponding staircase effect.

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Sen, Koyel, Tanu Mehta, Anson W.K.Ma, and Bodhisattwa Chaudhuri. "DEM based investigation of powder packing in 3D printing of pharmaceutical tablets." EPJ Web of Conferences 249 (2021): 14012. http://dx.doi.org/10.1051/epjconf/202124914012.

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3D printing is emerging as one of the most promising methods to manufacture Pharmaceutical dosage forms as it offers multiple advantages such as personalization of dosage forms, polypill, fabrication of complex dosage forms etc. 3D printing came into existence in 1980s but its use was extended recently to pharmaceutical industry along with the approval of first 3D printed tablet Spritam by FDA in 2015. Spritam was manufactured by Aprecia pharmaceuticals using binder jetting technology. Binder jet 3D printing involves a hopper for powder discharge and printheads for ink jetting. The properties of tablets are highly dependent upon the discharge quality of powder mixture from the hopper and jetting of the ink/binder solution from the printhead nozzle. In this study, numerical models were developed using Discrete element method (DEM) to gain better understanding of the binder jet 3D printing process. The DEM modeling of hopper discharge was performed using in-house DEM code to study the effect of raw material attributes such as powder bed packing density (i.e. particle size, particle density etc) on the printing process, especially during powder bed preparation. This DEM model was further validated experimentally, and the model demonstrated good agreement with experimental results.

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Smith, Nicholas M., Hossein Ebrahimi, Ranajay Ghosh, and Andrew K. Dickerson. "High-speed microjets issue from bursting oil gland reservoirs of citrus fruit." Proceedings of the National Academy of Sciences 115, no. 26 (June 11, 2018): E5887—E5895. http://dx.doi.org/10.1073/pnas.1720809115.

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The rupture of oil gland reservoirs housed near the outer surface of the citrus exocarp is a common experience to the discerning citrus consumer and bartenders the world over. These reservoirs often rupture outwardly in response to bending the peel, which compresses the soft material surrounding the reservoirs, the albedo, increasing fluid pressure in the reservoir. Ultimately, fluid pressure exceeds the failure strength of the outermost membrane, the flavedo. The ensuing high-velocity discharge of oil and exhaustive emptying of oil gland reservoirs creates a method for jetting small quantities of the aromatic oil. We compare this jetting behavior across five citrus hybrids through high-speed videography. The jetting oil undergoes an extreme acceleration to reach velocities in excess of 10 m/s. Through material characterization and finite element simulations, we rationalize the combination of tuned material properties and geometries enabling the internal reservoir pressures that produce explosive dispersal, finding the composite structure of the citrus peel is critical for microjet production.

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Bok, Moonjeong, Zhi-Jun Zhao, Soon Hyoung Hwang, Hyeok-Joong Kang, Sohee Jeon, Jiwoo Ko, Jiwon Jeong, Young Seok Song, Eunju Lim, and Jun-Ho Jeong. "Effective Dispensing Methods for Loading Drugs Only to the Tip of DNA Microneedles." Pharmaceutics 12, no. 10 (October 10, 2020): 954. http://dx.doi.org/10.3390/pharmaceutics12100954.

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Here, we propose a novel and simple method to efficiently capture the diffusion of fluorescein isothiocyanate (FITC)-dextran from a biocompatible substance and load the drug only to the tip of DNA microneedles. A dispensing and suction method was chosen to fabricate the designed microneedles with efficient amounts of FITC as the drug model. Importantly, the vacuum process, which could influence the capturing of FITC diffusion from the tip, was evaluated during the manufacturing process. In addition, the simulations were consistent with the experimental results and showed apparent diffusion. Moreover, dextrans of different molecular weights labeled with FITC were chosen to fabricate the tip of microneedles for demonstrating their applicability. Finally, a micro-jetting system with a micro-nozzle (diameter: 80 μm) was developed to achieve the accurate and rapid loading of small amounts of FITC using the anti-diffusion and micro-jetting methods. Our method not only uses a simple and fast manufacturing process, but also fabricates the tips of microneedles more efficiently with FITC compared with the existing methods. We believe that the proposed method is essential for the clinical applications of the microneedle drug delivery platform.

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Zhang, Hong Bo, Jian Pu Liu, and Huan Xin Lai. "Numerical Simulation of Jetting Instability in Flow Focusing Microfluidics." Key Engineering Materials 609-610 (April 2014): 630–36. http://dx.doi.org/10.4028/www.scientific.net/kem.609-610.630.

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In this paper, jetting behavior of two immiscible liquids, water as the outer liquid and silicone oil as the inner liquid in typical flow focusing microchannels were numerically studied using VOF method. At low capillary number, uniform microdroplets were obtained by the absolute instability. With the increasing of fluid flow ratio, the jet is thinner and tends to break up further away the cross junction. The results showed that the flow rate ratio is the main factor that influences the microdroplet sizes, while the frequency of microdroplets formation can be controlled mainly by the surface tension when it is in the jetting regime.

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Zeng, Qingyun, Silvestre Roberto Gonzalez-Avila, Sophie Ten Voorde, and Claus-Dieter Ohl. "Jetting of viscous droplets from cavitation-induced Rayleigh–Taylor instability." Journal of Fluid Mechanics 846 (May 11, 2018): 916–43. http://dx.doi.org/10.1017/jfm.2018.284.

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Liquid jetting and fragmentation are important in many industrial and medical applications. Here, we study the jetting from the surface of single liquid droplets undergoing internal volume oscillations. This is accomplished by an explosively expanding and collapsing vapour bubble within the droplet. We observe jets emerging from the droplet surface, which pinch off into finer secondary droplets. The jetting is excited by the spherical Rayleigh–Taylor instability where the radial acceleration is due to the oscillation of an internal bubble. We study this jetting and the effect of fluid viscosity experimentally and numerically. Experiments are carried out by levitating the droplet in an acoustic trap and generating a laser-induced cavitation bubble near the centre of the droplet. On the simulation side, the volume of fluid method (OpenFOAM) solves the compressible Navier–Stokes equations while accounting for surface tension and viscosity. Both two-dimensional (2-D) axisymmetric and 3-D simulations are performed and show good agreement with each other and the experimental observation. While the axisymmetric simulation reveals how the bubble dynamics results destabilizes the interface, only the 3-D simulation computes the geometrically correct slender jets. Overall, experiments and simulations show good agreement for the bubble dynamics, the onset of disturbances and the rapid ejection of filaments after bubble collapse. Additionally, an analytic model for the droplet surface perturbation growth is developed based on the spherical Rayleigh–Taylor instability analysis, which allows us to evaluate the surface stability over a large parameter space. The analytic model predicts correctly the onset of jetting as a function of Reynolds number and normalized internal bubble energy.

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Hua, Shaozhen, Shixun Zhang, Wei Cao, Yaming Wang, Chunguang Shao, Chuntai Liu, Binbin Dong, and Changyu Shen. "Simulation of Jetting in Injection Molding Using a Finite Volume Method." Polymers 8, no. 5 (May 4, 2016): 172. http://dx.doi.org/10.3390/polym8050172.

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Wang, Zhi-Feng, Jack S. Shen, and Wen-Chieh Cheng. "Simple Method to Predict Ground Displacements Caused by Installing Horizontal Jet-Grouting Columns." Mathematical Problems in Engineering 2018 (2018): 1–11. http://dx.doi.org/10.1155/2018/1897394.

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During the horizontal jet grouting in soft ground, injection of large volumes of water and grout into the soil can lead to significant ground displacements. A simple method is proposed in this paper to predict the ground displacements caused by installing horizontal jet-grouting columns. The process of installing a horizontal column is simplified as the expansion of a cylindrical cavity with a uniform radial stress applied at plastic-elastic interface in a half plane. In this study, the analytical solution is adopted to calculate the deformation induced by the expansion of a cylindrical cavity. Considering the main jetting parameters (jetting pressure of the fluid, flow rate of the fluid, and withdrawal rate of the rod) and the soil properties (stiffness of the surrounding soil), an empirical equation to estimate the radius of plastic zone is developed. Two field tests are carried out in Shanghai, China, to verify the correctness and applicability of the proposed method. Comparisons between the predicted and measured values indicate that the proposed method can provide a reasonable prediction. The proposed simple method can be recommended as a useful tool for the design of ground improvement by means of horizontal jet grouting.

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Borkowski, Przemysław J., Józef A. Borkowski, Michał Bielecki, Mariusz O. Jędrysek, and Tomasz Abramowski. "Basis of high-pressure water-jet use for polymetallic nodule comminution." Mechanik 91, no. 10 (October 8, 2018): 922–25. http://dx.doi.org/10.17814/mechanik.2018.10.163.

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Two-stage mechanical and hydro-jetting method of polymetallic nodules’ comminution are presented in the paper. Physical basis as well as possibilitiess of high-pressure water jet method for efficient processing of such nodules, extracted from 4200 m below sea level, are given too.

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Dahil, Lutfiye. "Examining the Effects of Advanced Cutting Methods on Surface Porosity of Aluminum Foam Material." International Journal of Advanced Research in Engineering 3, no. 2 (June 24, 2017): 6. http://dx.doi.org/10.24178/ijare.2017.3.2.06.

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Abstract—In this study, the aluminum foam material having two different pore structures was obtained. These materials were cut using advanced cutting methods (waterjet and wire erosion). And then, the porosity levels of the cut surfaces were examined depending on the cutting method applied. In order to ensure the equal measurement, the rate of feed was set to 40m/min. The porosity measurements were repeated for 6 times in parallel and vertical to cutting surface, and the mean value of those measurements was calculated. There were also problems with the two cutting methods. Both methods require additional processing. In terms of continuity of the cutting process, water jet is more advantageous. Water jetting in high and medium pore specimens yielded better results in places parallel to the cutting surface. It was the result of water jetting better at places that are perpendicular to the cutting surface. Key words: Aluminumfoammaterial, Advanced cuttingtechniques, Pore, Surfaceroughness.

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Borkowski, Przemysław, Józef Borkowski, and Michał Bielecki. "Dual-procedure method of quasi-spatial objects’ imaging with hydro-jetting technique." Mechanik, no. 8-9 (September 2015): 709/45–709/49. http://dx.doi.org/10.17814/mechanik.2015.8-9.339.

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Ho-Young Son, Jae-Woong Nah, and Kyung-Wook Paik. "Formation of Pb/63Sn solder bumps using a solder droplet jetting method." IEEE Transactions on Electronics Packaging Manufacturing 28, no. 3 (July 2005): 274–81. http://dx.doi.org/10.1109/tepm.2005.853068.

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Ohta, Takashi, Daisuke Ogasawara, Takahiro Iwai, Hidekazu Miyahara, and Akitoshi Okino. "Development of Ultrasonic Pulsed Plasma Jet Source for Remote Surface Treatment." Applied Sciences 13, no. 1 (December 29, 2022): 444. http://dx.doi.org/10.3390/app13010444.

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We have developed a supersonic pulsed plasma jet device capable of long-distance and high-speed processing, and investigated its basic characteristics for surface treatment applications, mainly in the material and medical fields. The developed apparatus is equipped with a mechanism to transport active species in the plasma to the object to be treated by jetting the generated high-density plasma outward with supersonic pulse jets, which allows the gas flow velocity to increase significantly during pulse jetting compared with plasma generation. This enables the active species in the plasma to reach the treatment target before deactivation, thereby realizing surface treatment at a distance. Measurements using the Schlieren method revealed that the velocity of the jet flow reached Mach 1.7.

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GÜRGEN, Mert, and Cengiz KAYACAN. "EFFECT OF SINTERING TEMPERATURE TO MICROSTRUCTURE IN METAL BINDER JETTING." Mühendislik Bilimleri ve Tasarım Dergisi 10, no. 4 (December 30, 2022): 1389–99. http://dx.doi.org/10.21923/jesd.1110330.

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Metal Binder Jetting emerged and it has been developing an additive manufacturing method. Binder type, binder ratio, sintering process, and atmosphere couldn’t be transparently determined due to its development stage. In this study, effect of sintering temperature was investigated parts’ microstructure which manufactured by Binder Jetting Metal Additive Manufacturing. In manufacturing, SS316L metal powder used as a raw material, ultraviolet light cured and solid+fluid catalyzed cured resins used as binder. For solid+liquid catalyzed cured resin, furfuryl alcohol was selected as liquid binder, para toluene sulfonic acid was selected as solid catalyst. Isopropyl alcohol was used to dilute the ultraviolet light cured resin. The composition ratios and electron diffraction patterns of the samples were analyzed using optical and scanning electron microscopy.

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Shah, Lee, and Hur. "Design and Characteristic Analysis of a MEMS Piezo-Driven Recirculating Inkjet Printhead Using Lumped Element Modeling." Micromachines 10, no. 11 (November 6, 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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Clares, Ana Paula, Yawei Gao, Ryan Stebbins, Adri C. T. Van Duin, and Guha Manogharan. "Increasing density and mechanical performance of binder jetting processing through bimodal particle size distribution." Materials Science in Additive Manufacturing 1, no. 3 (September 29, 2022): 20. http://dx.doi.org/10.18063/msam.v1i3.20.

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Binder jetting is an additive manufacturing (AM) technology that has gained popularity and attention in recent years for production applications in tooling, biomedical, energy, and defense sectors. When compared to other powder bed fusion-based AM methods, binder jetting processes powder feedstock without the need of an energy source during printing. This avoids defects associated with melting, residual stresses, and rapid solidification within the parts. However, one of the challenges of this process is the relatively lower densities which impacts part density, and subsequently, sintering and mechanical properties. In this study, we investigated the influence of bimodal powder size distributions (a mixture of coarse to fine particles) as a method for increasing part density and mechanical strength, and used stainless steel (SS) 316L bimodal mixtures in this case. Four unimodal and two bimodal groups were evaluated under similar AM processing conditions for sintered density measurements and flexural strengths. Our results demonstrated that bimodal size distributions showed a statistically significant increase in density by 20% and ultimate flexural strength by 170% when compared to the highest performing unimodal group. In addition to experimental findings, reactive molecular dynamics simulations showed that the presence of finer powders along with coarser particles in the bimodal particle mixture contribute to additional bonds that are stronger across the particle interfaces. Findings from this study can be used to design bimodal particle size distributions to achieve higher density and better mechanical properties in binder jetting AM process.

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Zhan, Hongwu, Fang Xu, and Zijing Ni. "Fluid dynamic modeling and fuzzy proportional–integral–derivative–based ink-supply method for piezoelectric ink-jet printing." Advances in Mechanical Engineering 9, no. 7 (July 2017): 168781401771898. http://dx.doi.org/10.1177/1687814017718981.

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To resolve the problems of ink drop tailing, satellite drop, and ink ribbon of piezoelectric ink-jet printing, a fluid dynamic modeling method and an adaptive ink-supply method are proposed. First, based on the volume of fluid method, a fluid dynamic model for the jetting and forming of ink drop is set up. According to this model, the numerical analysis for the states of forming, fracture, and flight of ink drops is performed; referring to different boundary conditions of piezoelectric ink-jet process, the inherent relations between ink characteristics and ink drop motion are analyzed, and an optimal viscosity range for piezoelectric nozzle is confirmed. Then, a fuzzy proportional–integral–derivative–based ink-supply control method is developed to achieve the fast and smooth responses for ink temperature and to obtain the required ink characteristics and ink-supply effects. Finally, a microcontroller-based piezoelectric ink-jetting experiment platform is established, and the experiment results show that the fluid dynamic modeling method can simulate the flow field profiles of piezoelectric ink-jet; the fuzzy proportional–integral–derivative–based ink-supply system can improve the printing quality; the print stripes are decreased obviously, and the softer and cleaner images can be obtained.

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Xue, Kun, and Haoran Cui. "Discrete element modeling of shock-induced particle jetting." Modern Physics Letters B 32, no. 12n13 (May 10, 2018): 1840049. http://dx.doi.org/10.1142/s0217984918400493.

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The dispersal of particle shell or ring by divergent impulsive loads takes the form of coherent particle jets with the dimensions several orders larger than that of constituent grain. Particle-scale simulations based on the discrete element method have been carried out to reveal the evolution of jets in semi-two-dimensional rings before they burst out of the external surface. We identify two key events which substantially change the resulted jetting pattern, specifically, the annihilation of incipient jets and the tip-slipping of jets, which become active in different phases of jet evolution. Parametric investigations have been done to assess the correlations between the jetting pattern and a variety of structural parameters. Overpressure, the internal and outer diameters of ring as well as the packing density are found to have effects on the jet evolution with different relative importance.

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Roshanghias, Ali, Jochen Bardong, and Alfred Binder. "Glass Frit Jetting for Advanced Wafer-Level Hermetic Packaging." Materials 15, no. 8 (April 11, 2022): 2786. http://dx.doi.org/10.3390/ma15082786.

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Glass frit bonding is a widely used technology to cap and seal micro-electromechanical systems on the wafer level using a low melting point glass. Screen printing is the main method to apply glass frit paste on wafers. Screen printing of glass frit paste is usually performed on less sensitive, less critical wafers, normally the capping wafer, because screen printing is a rough process involving the mechanical contact of the screen printing mesh and the wafer. However, for some applications in which contactless patterning of glass frit materials on the device wafers are preferred (e.g., 3D topographies, micro-lens and optics integration) jet dispensing could be a promising approach. Consequently, in this study, wafer-level jetting of glass frit materials on silicon wafers was proposed and investigated. The jetting parameters such as jetting distance, power and temperature were optimized for a glass frit paste. Additionally, the effect of jetted pitch size on the bond-line thickness was assessed. The wafers with jetted glass frit pastes were conclusively bonded in low vacuum and characterized. As a single-step (non-contact) additive approach, the jet printing of glass frit was revealed to be a straightforward, cost-effective and flexible approach with several implications for hermetic packaging.

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Begines, Belen, Andrew L. Hook, Morgan R. Alexander, Christopher J. Tuck, and Ricky D. Wildman. "Development, printability and post-curing studies of formulations of materials resistant to microbial attachment for use in inkjet based 3D printing." Rapid Prototyping Journal 22, no. 5 (August 15, 2016): 835–41. http://dx.doi.org/10.1108/rpj-11-2015-0175.

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Purpose This paper aims to print 3D structures from polymers that resist bacterial attachment by reactive jetting of acrylate monomers. Design/methodology/approach The first step towards printing was ink development. Inks were characterised to carry out an estimation of their potential printability using the Z parameter to predict stable jetting conditions. Printability conditions were optimised for each ink using a Dimatix DMP-2800, which enabled 3D structures to be fabricated. Findings UV photo-initiated polymers, which resist bacterial attachment, were found to be printable using piezo-based inkjet printers. The waveform required for each ink depends on the value of the Z parameter. Once the waveform and the printability parameters were optimised, 3D objects were fabricated. Research limitations/implications This methodology has been confirmed as an effective method to 3D print materials that have been demonstrated to be bacteria resistant. However, ink curing depends on modification of some parameters (such as photoinitiator concentration or UV exposure time) which would result in an improvement of the curing process post jetting. Social implications The combination of inkjet based 3D printing with new materials resistant to bacterial attachment means the possibility of building customised medical devices with a high level of complexity and bespoke features can be fully realised. The scope and variability of the devices produced will exceed what can be achieved using standard fabrication methodologies and can be applied to reduce the incidence of device associated infections and to address increased morbidity, mortality and health care costs associated with nosocomial infections. Originality/value In this paper, the novel use of materials that resist bacterial attachment has been described to build 3D structures using material jetting. Its value lies on the potential impact this methodology could produce in the biomedical device and research fields.

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OKUI, Manabu, Takumi YASUI, Rie NISHIHAMA, and Taro NAKAMURA. "Application of a force feedback method using air jetting to hand position guidance." Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec) 2021 (2021): 1A1—H02. http://dx.doi.org/10.1299/jsmermd.2021.1a1-h02.

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KOEDA, Kyo, Koji TAKEDA, and Toshinari AKIMOTO. "Development of binder jetting type 3D printer for construction using powder deposition method." Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec) 2022 (2022): 1P1—B08. http://dx.doi.org/10.1299/jsmermd.2022.1p1-b08.

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Journal articles on the topic 'Jetting method'

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