Additive manufacturing requires a relatively long time to fabricate complex three-dimensional (3D) structures or parts with more than one material. For additive manufacturing processes, production time and precision vary depending on the fabrication conditions. In this study, we developed a food additive manufacturing process of the material extrusion method type using a dual nozzle. In addition, we observed the change in the cross-sectional shape of the discharged food line according to each fabrication condition. By using a dual nozzle, the structure was fabricated under conditions of relatively high precision for the outer wall and relatively low precision for the infill, thereby shortening the production time. Through this process, it can be expected that the production time will be shortened in the food field, while the appearance will be of good quality.
Due to the pandemic of SARS-CoV-2 (COVID-19) virus, the demand for personal protective equipment (PPE), including face shield, ventilator value, and so on, has abruptly increased in the world. The collapse of the global supply chain of PPE has led to a shortage of the PPE. An additive manufacturing process has emerged as one of solutions to overcome such shortage. The objective of this study was to develop a reusable protective face shield using a material extrusion (ME) process. Five types of face shield were designed. Effects of the design on effective stress distribution, deformation, and specific rigidity were investigated through finite element analyses. To examine the influence of the design on deposition and post-processing characteristics, five types of face shield were fabricated from a ME apparatus. Post-processing characteristics and building time were greatly improved when Design 1 was adopted. In addition, the overall weight, wasted material, and buy-to-fly (BTF) ratio were significantly reduced when Design 1 was applied. Finally, results of wearing and droplet spreading experiments showed that the fabricated face shield for Design 1 was applicable to protection of droplet spreading.
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Investigation of Applicability of Additive Manufacturing Processes to Appropriate Technologies for Developing Countries Dong-Gyu Ahn Academic Society for Appropriate Technology.2021; 7(2): 188. CrossRef
Since most commercialized DLP 3D printers fabricate 3D structures by sinking materials to Vat using a bottom-up method, it is difficult to use various materials simultaneously and there are many restrictions on printing composite materials. Especially, composite resin mixed with various functional powders in photo curable resin generally has high viscosity, causing difficult material flow in the bottom-up method when using Vat. Additionally, most of the previously presented methods for fabricating multi-material structure use individual curing for each material, so the adhesion force at the contact surface is less than 50% compared to single material. Thus, in this paper, we propose a new type of DLP 3D printer that combines Material Extrusion and the DLP system. The proposed equipment can supply high viscosity composite material resins to a specific area to cure various materials simultaneously. This method will enable fabrication of multiple composite material structures with sufficient adhesion force. The tensile test will be performed to verify suitability of the proposed method.
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Evaluation of Bond Strength in Multi-Material Specimens Using a Consumer-Grade LCD 3D Printer Shunpei Shimizu, Masaya Inada, Tomoya Aoba, Haruka Tamagawa, Yuichiro Aoki, Masashi Sekine, Sumihisa Orita Journal of Manufacturing and Materials Processing.2025; 9(10): 332. CrossRef
Development of a Material Mixing Extrusion Type Chocolate 3D Printer MinSoo Park, HyungJik Jeong, JaeHyuek Moon, JungMuk Lim Journal of the Korean Society for Precision Engineering.2021; 38(2): 145. CrossRef
Dimensional Characteristics of 3D Printing by FDM and DLP Output Methods Myung-Hwi Jung, Jeong-Ri Kong, Hae-Ji Kim Journal of the Korean Society of Manufacturing Process Engineers.2021; 20(1): 66. CrossRef
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Material extrusion (ME) type 3D printing has been widely utilized through various types of systems depending on the fabrication methods, materials, and precision to fabricate complex workpieces that cannot be made with conventional methods. This study provides basic considerations in response to the current demands on performance evaluation of ME type 3D printing related to dimensions as well as the realization of the guidelines to be established in the near future. As a simple specimen for these purposes, 2D and 3D hole-plates were designed and fabricated by using a ME type entry-level 3D printer. For evaluation of dimensions on the specimen, both specimens were measured by a calibrated tool-maker’s microscope which is to length standard. The measurement parameters were the center position of the holes, the diameter of the holes, and the circularity error of the holes.
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A Study on 3D Printing Conditions Prediction Model of Bone Plates Using Machine Learning Song Yeon Lee, Yong Jeong Huh Journal of the Korean Society for Precision Engineering.2022; 39(4): 291. CrossRef
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The necessity for printing multi-materials has increased as the importance of 3D printing grew in various industries. Many studies have undertaken for printing multi-materials simultaneously. In ME (Material Extrusion) type 3D printers, the method of printing different materials using multi nozzles is generally commercialized. Polymers with different composition are hardto-mix with each other, making it difficult to maintain the structural strength of printer parts. So the MJ type 3D printer uses a unique method that mixes multi-materials in a liquid state before printing. In the ME type 3D printer, there were also efforts to mix materials in a melted state, but they were mainly demonstrated for multi-colored parts. In this study, the effect of multi-material mixing on structural strength changes was tested. Multi-Materials were printed with the ME type 3D printer by using one nozzle with a multiple filament feeding system. The bending and tensile tests were conducted to verify the structural characteristics.
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Analysis of Correlation between FDM Additive and Finishing Process Conditions in FDM Additive-Finishing Integrated Process for the Improved Surface Quality of FDM Prints Ji Won Yu, Hyung Jin Jeong, Jae Hyung Park, Dong Hun Lee Journal of the Korean Society for Precision Engineering.2022; 39(2): 159. CrossRef
Study on the Reduction of Food Fabrication Time in Additive Manufacturing Process Using Dual Nozzle Seung Yeop Baik, Ju Ho Park, Sang In Kang, In Hwan Lee Journal of the Korean Society for Precision Engineering.2021; 38(11): 879. CrossRef
Property Analysis of Photo-Polymerization-Type 3D-Printed Structures Based on Multi-Composite Materials So-Ree Hwang, Min-Soo Park Applied Sciences.2021; 11(18): 8545. CrossRef
Development of a Material Mixing Extrusion Type Chocolate 3D Printer MinSoo Park, HyungJik Jeong, JaeHyuek Moon, JungMuk Lim Journal of the Korean Society for Precision Engineering.2021; 38(2): 145. CrossRef
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