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Journal articles on the topic 'Injection molding'

Author: Grafiati

Published: 4 June 2021

Last updated: 30 July 2024

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1

Park, Hyungpil, Baeg-Soon Cha, and Byungohk Rhee. "Experimental and Numerical Investigation of the Effect of Process Conditions on Residual Wall Thickness and Cooling and Surface Characteristics of Water-Assisted Injection Molded Hollow Products." Advances in Materials Science and Engineering 2015 (2015): 1–11. http://dx.doi.org/10.1155/2015/161938.

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Recently, water-assisted injection molding was employed in the automobile industry to manufacture three-dimensional hollow tube-type products with functionalities. However, process optimization is difficult in the case of water-assisted injection molding because of the various rheological interactions between the injected water and the polymer. In this study, the boiling phenomenon that occurs because of the high melt temperature when injecting water and the molding characteristics of the hollow section during the water-assisted injection process were analyzed by a water-assisted injection molding analysis. In addition, the changes in the residual wall thickness accompanying changes in the process conditions were compared with the analysis results by considering water-assisted injection molding based on gas-assisted injection molding. Furthermore, by comparing the cooling characteristics and inner wall surface qualities corresponding to the formation of the hollow section by gas and water injections, a water-assisted injection molding technique was proposed for manufacturing hollow products with functionality.

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2

Kaneto, Yoshinori. "Injection Molding." Seikei-Kakou 21, no. 7 (June 20, 2009): 356–60. http://dx.doi.org/10.4325/seikeikakou.21.356.

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3

Akimoto, Hideo. "Injection Molding." Seikei-Kakou 23, no. 7 (June 20, 2011): 374–78. http://dx.doi.org/10.4325/seikeikakou.23.374.

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4

Akimoto, Hideo. "Injection Molding." Seikei-Kakou 22, no. 7 (June 20, 2010): 322–25. http://dx.doi.org/10.4325/seikeikakou.22.322.

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5

Kanetoh, Yoshinori. "Injection Molding." Seikei-Kakou 20, no. 7 (July 20, 2008): 370–74. http://dx.doi.org/10.4325/seikeikakou.20.370.

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6

Fujiyama, Mitsuyoshi. "Injection Molding." Seikei-Kakou 24, no. 7 (June 20, 2012): 347–54. http://dx.doi.org/10.4325/seikeikakou.24.347.

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7

Fujiyama, Mitsuyoshi. "Injection Molding." Seikei-Kakou 25, no. 7 (June 20, 2013): 292–97. http://dx.doi.org/10.4325/seikeikakou.25.292.

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8

Seto, Masahiro. "Injection Molding." Seikei-Kakou 26, no. 7 (June 20, 2014): 288–92. http://dx.doi.org/10.4325/seikeikakou.26.288.

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9

Seto, Masahiro. "Injection Molding." Seikei-Kakou 27, no. 7 (June 20, 2015): 242–46. http://dx.doi.org/10.4325/seikeikakou.27.242.

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10

Asanuma, Nobuyuki. "Injection Molding." Seikei-Kakou 28, no. 7 (June 20, 2016): 250–53. http://dx.doi.org/10.4325/seikeikakou.28.250.

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11

Asanuma, Nobuyuki. "Injection Molding." Seikei-Kakou 29, no. 7 (June 20, 2017): 218–21. http://dx.doi.org/10.4325/seikeikakou.29.218.

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12

Yamabe, Masashi. "Injection Molding." Seikei-Kakou 30, no. 7 (June 25, 2018): 293–99. http://dx.doi.org/10.4325/seikeikakou.30.293.

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13

Tatsuno, Michihiro. "Injection Molding." Seikei-Kakou 30, no. 8 (July 20, 2018): 396–400. http://dx.doi.org/10.4325/seikeikakou.30.396.

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14

Tatsuno, Michihiro. "Injection Molding." Seikei-Kakou 31, no. 7 (June 20, 2019): 254–58. http://dx.doi.org/10.4325/seikeikakou.31.254.

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15

Hamano, Yuhsuke. "Injection Molding." Seikei-Kakou 34, no. 7 (June 20, 2022): 241–45. http://dx.doi.org/10.4325/seikeikakou.34.241.

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16

Seto, Masahiro. "Injection Molding." Seikei-Kakou 34, no. 9 (August 20, 2022): 338. http://dx.doi.org/10.4325/seikeikakou.34.338_1.

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17

YOKOI, Hidetoshi. "Injection Molding." Journal of the Japan Society for Technology of Plasticity 57, no. 660 (2016): 8–13. http://dx.doi.org/10.9773/sosei.57.8.

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18

Koresawa, Hiroshi, Kohei Tanaka, and Hiroyuki Narahara. "Low-Energy Injection Molding Process by a Mold with Permeability Fabricated by Additive Manufacturing." International Journal of Automation Technology 10, no. 1 (January 4, 2016): 101–5. http://dx.doi.org/10.20965/ijat.2016.p0101.

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This paper describes the improvement of flow length and realization of low-energy molding in the injection molding process, by focusing on the injection mold with permeability fabricated by additive manufacturing. The mold is equipped with a sintered body with permeability, which is used as a mold insert. The inside of the sintered mold insert is structured so that the permeability should not be degraded, even if the thickness is increased. With respect to the effect of the sintered mold insert with permeability, the flow length and low-energy molding are evaluated by the filling rate of a thin section of moldings, and the electric energy of the injection molding machine that drives the screw in the injection process. Through fundamental experiments, the mold using the sintered mold insert with permeability was found to improve the flow length. The electric energy of the injection molding machine in the injection process is reduced by 6%--13% compared with the sintered mold insert without permeability.

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19

POSTAWA, PRZEMYSLAW. "Shrinkage of moldings and injection molding conditions." Polimery 50, no. 03 (March 2005): 201–7. http://dx.doi.org/10.14314/polimery.2005.201.

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20

Janowski, Grzegorz. "Characteristic of micro injection molding process. Standard injection molding, material selection, micro injection molding machines." AUTOBUSY – Technika, Eksploatacja, Systemy Transportowe 18, no. 12 (December 31, 2017): 32–36. http://dx.doi.org/10.24136/atest.2017.048.

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The growing needs for miniaturization of plastic parts motivates to the development of micro injection molding technology. Characteristic features of this process such as: low manufacturing costs, short process duration, the ability to produce details of various dimensions and a wide range of plastic properties allow to mass dissemination of this technology. Research on micro injection molding develops in a very fast time, which gives high hopes for a successful overcoming of the real limitations of this technology. This gives a great perspective on the development of the possibility of using micro injection parts e.g. in the automotive industry, including the bus production process. This paper presents the conventional injection molding process – i.e. the process essence, the injection molding cycle and the construction of a conventional screw-type injection molding machine. The next part of this article focuses on the characteristics of micro injection molding technology. The essence of material selection and micro-part characteristics for the process were presented. Furthermore, injection molding machines for this process were characterized.

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21

Gnatowski, Adam, Agnieszka Kijo-Kleczkowska, Jaroslaw Krzywanski, Przemyslaw Lemanski, and Elzbieta Kopciuszewska. "Computer Simulations of Injection Process of Elements Used in Electromechanical Devices." Materials 15, no. 7 (March 29, 2022): 2511. http://dx.doi.org/10.3390/ma15072511.

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This paper presents the computer simulations of the injection process of elements used in electromechanical devices and an analysis of the impact of the injection molding process parameters on the quality of moldings. The study of the process was performed in Autodesk Simulation Moldflow Insight 2021. The setting of the injection process of the detail must be based on the material and process technological card data and knowledge of the injection molding machine work. The supervision of production quality in the case of injection moldings is based on the information and requirements received from the customer. The main goal of the analysis is to answer the question: how to properly set up the process of filling the mold cavities in order to meet the quality requirements of the presented molding. In this paper, the simulation was compared with the real process. It is extremely important to optimize the injection, including synchronizing all process parameters. Incorrectly selected values of the parameters may lead to product defects, leading to losses and destruction of raw materials, and unnecessary energy consumption connected with the process.

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22

Zhou, Shengtai, and Andrew N. Hrymak. "Injection Molding of Polymers and Polymer Composites." Polymers 16, no. 13 (June 25, 2024): 1796. http://dx.doi.org/10.3390/polym16131796.

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Injection molding technology has been widely adopted to fabricate multifunctional polymeric components or structural parts for applications in fields such as automotives, electronics, packaging, aerospace, and many others. It is also widely accepted that the properties of injection moldings are greatly affected by the development of crystalline structure, the distribution and orientation of functional fillers which are incurred by the prevailing shearing and extensional flow fields as well as the cooling effect during injection molding [...]

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23

ISHIHARA, Hikaru, Makoto NIIKAWA, Minoru YAMASHITA, and Naoto OKITSU. "Evaluation of molding characteristics for thick-walled moldings by resin injection molding." Proceedings of Conference of Tokai Branch 2020.69 (2020): 303. http://dx.doi.org/10.1299/jsmetokai.2020.69.303.

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24

Lee, Dan Bi, Yun Hyo Nam, and Min-Young Lyu. "Comparison of Molding Characteristics for Multi-cavity Molding in Conventional Injection Molding and Injection Compression Molding." Polymer Korea 38, no. 2 (March 25, 2014): 144–49. http://dx.doi.org/10.7317/pk.2014.38.2.144.

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25

Satin, Lukáš, and Jozef Bílik. "Verification CAE System for Plastic Injection." Applied Mechanics and Materials 834 (April 2016): 79–83. http://dx.doi.org/10.4028/www.scientific.net/amm.834.79.

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This article is focused on the field of computer simulation and it is subsequent verification in practice. The work highlights the injection process, the simulation software that is specialized in injection molding and the technology process of injection itself. The major subject of the thesis is the use of the computer aided injection molding technology by using the CAE systems. The experimental part of the thesis deals with the production of the 3D model specific plastic parts in two modifications, injection molding simulation in the system Moldex3D and digitization of moldings on the optical 3D scanner. In the thesis we also provide measuring realization on digitized models and comparison of the parts size with the computer model. In conclusion we summarize the results achieved from the comparison. The thesis is carried out in cooperation with the Simulpast s.r.o.

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26

Otsuki, Yoshiharu. "Gas Injection Molding." Seikei-Kakou 2, no. 2 (1990): 141–46. http://dx.doi.org/10.4325/seikeikakou.2.141.

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27

NAKANO, Ryo. "Injection Molding Simulation." Journal of the Japan Society for Technology of Plasticity 47, no. 543 (2006): 273–78. http://dx.doi.org/10.9773/sosei.47.273.

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28

Gong, S., M. Yuan, A. Chandra, H. Kharbas, A. Osorio, and L. S. Turng. "Microcellular Injection Molding." International Polymer Processing 20, no. 2 (May 2005): 202–14. http://dx.doi.org/10.3139/217.1883.

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29

Vos, E., H. E. H. Meijer, and G. W. M. Peters. "Multilayer Injection Molding." International Polymer Processing 6, no. 1 (March 1991): 42–50. http://dx.doi.org/10.3139/217.910042.

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30

OKUBO, Kenji. "Metal Injection Molding." Journal of the Japan Society for Technology of Plasticity 56, no. 651 (2015): 261–64. http://dx.doi.org/10.9773/sosei.56.261.

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31

Hattori, Kenichi. "Gas Injection Molding." Kobunshi 42, no. 9 (1993): 758. http://dx.doi.org/10.1295/kobunshi.42.758.

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32

Uchio, Shunji. "Precision injection molding." Kobunshi 39, no. 6 (1990): 430–31. http://dx.doi.org/10.1295/kobunshi.39.430.

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33

Mayer, Ralf. "Precision Injection Molding." Optik & Photonik 2, no. 4 (December 2007): 46–51. http://dx.doi.org/10.1002/opph.201190286.

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34

Shaw, Lane G. "Injection molding PVC." Journal of Vinyl and Additive Technology 9, no. 1 (March 1987): 2–9. http://dx.doi.org/10.1002/vnl.730090103.

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35

M.A. Barger and Yasunori Kanai. "Lamellar Injection Molding." Seikei-Kakou 10, no. 2 (February 20, 1998): 98–104. http://dx.doi.org/10.4325/seikeikakou.10.98.

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36

Yang, Lung Jieh, Chung Yu Kao, and Chin Kwang Huang. "Development of Flapping Ornithopters by Precision Injection Molding." Applied Mechanics and Materials 163 (April 2012): 125–32. http://dx.doi.org/10.4028/www.scientific.net/amm.163.125.

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The authors investigate the component fabrication of a flapping ornithopter with 21.6 cm wing span by using precision injection molding. For making a bio-mimicking flapper like birds, two fold of plastic injection moldings have been done. Firstly the flapping mechanism of a 4-bar linkage gear transmission module has been studied, and the according plastic components for the gear transmission module were designed as light as possible. Thereafter the injection flow analysis in the multi-mold cavity and the fabrication parameters of the molding process has been implemented. The finished polyoxymethylene (POM) components for the transmission module of 1.2 gram in mass finally verify the design and process of the precision injection molding. After the ornithopterGolden Snitchwas assembled and tested with the fore-mentioned plastic 4-bar linkage, a maximum flight record of 480 sec was created in 2010. The second framework of injection molding is to design a bird-like expandable polystyrene (EPS) fuselage with 19.5 cm in length as the mechanical protection. After this ornithopterGolden Snitch-Prowas assembled, it has a successful flight of 230 sec and 100 times of landing capability. In summary, the fabrication of a polymeric bird-like flapper is proved, and the precision injection molding technique shows its feasibility in realization of ornithopters.

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37

YOKOYAMA, KAZUHISA. "Rubber injection molding on the viewpoint of plastic injection molding." NIPPON GOMU KYOKAISHI 59, no. 4 (1986): 239–45. http://dx.doi.org/10.2324/gomu.59.239.

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38

Zheng, Zou Shun, and Rui Rui Leng. "The Intelligent Control Method of the Density of the Metal Injection Molding Billet Based on ANN." Materials Science Forum 749 (March 2013): 161–67. http://dx.doi.org/10.4028/www.scientific.net/msf.749.161.

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According to the metal powder injection molding process, the main influence factors of injection molding billet density distribution (such as: injection velocity, injection temperature, injection pressure, etc) was analyzed and a multiple input & multiple output BP neural network model for injection molding was build up to predict the density distribution of the billet intelligently based on ANN and GA. In addition, in light of the requirements for the density distribution of the metal injection molding billet, the influence factors were controlled intelligently. Applying this model in the metal injecting process, the density distribution of billet was predicted according to the injection parameters and the injection parameters was optimized according to the required density distribution of the billet. As the result, the error was less than 5% between the prediction values and the actual values of the density distribution of billet. With the optimized injection parameters to the injection process, the density distribution of billet closed to the requirements was achieved.

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39

FUJIEDA, Ryuuichirou, and Masanori KUNIEDA. "2107 Research on Molding Conditions in Micro Injection Molding using Laminated Tool." Proceedings of International Conference on Leading Edge Manufacturing in 21st century : LEM21 2015.8 (2015): _2107–1_—_2107–6_. http://dx.doi.org/10.1299/jsmelem.2015.8._2107-1_.

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40

Zhu, Junjie, Zhiwen Qiu, and Wenhan Huang. "Development and Application of High-gloss Injection Molding Technology." Journal of Physics: Conference Series 2206, no. 1 (February 1, 2022): 012016. http://dx.doi.org/10.1088/1742-6596/2206/1/012016.

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Abstract High-gloss injection molding technology is a new green injection molding technology based on dynamic mold temperature control strategy. Compared with the traditional injection molding technology, this technology can obviously improve the surface quality of products, and obtain high quality products with high gloss and no weld line. This paper introduces the principle and technological characteristics of high-gloss injection molding, analyzes the key technology and development of high-gloss injection molding. The key technologies of high-gloss injection molding mainly include high-gloss molding material, high-gloss mold, mold temperature control system, etc. Finally, the existing problems of high-gloss injection molding technology are analyzed, and the breakthrough direction in the field of injection molding in the future is proposed.

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41

FUJITA, SHIGERU. "Injection molding machine required for precision molding." Journal of the Japan Society for Precision Engineering 52, no. 2 (1986): 219–23. http://dx.doi.org/10.2493/jjspe.52.219.

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42

Kato, Hideaki. "Molding Defects in Plastic Injection Molding/Introduction." Seikei-Kakou 36, no. 4 (March 20, 2024): 138–41. http://dx.doi.org/10.4325/seikeikakou.36.138.

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43

Rizvi, S. J. A. "Microcellular Foam Injection Molding of Thermoplastics Using Green Physical Blowing Agent." Materials Science Forum 875 (October 2016): 77–111. http://dx.doi.org/10.4028/www.scientific.net/msf.875.77.

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The microcellular injection molding technology, commercially offered by Trexel Inc. and other manufacturers, is primarily a close cell foaming technique. This process is capable of offering light weight non-porous thermoplastics moldings. The foaming of thermoplastics with open cellular morphology has got various high end applications among others like tissue engineering and membrane separation. Some of the researchers were successful in synthesis of open cellular thermoplastics at laboratory scale via solid state batch process. The growing demand for microporous thermoplastics, especially the biodegradable plastics (e.g. Polylactic acid), motivated the researchers develop a specialized microcellular injection molding process for processing of open cell thermoplastics using physical blowing agents such as supercritical nitrogen or carbon dioxide gas. A brief of theoretical and conceptual treatment of microcellular injection molding is presented.

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44

Kim, Jin Woo, and Dong Gi Lee. "Fiber Orientation State Depending on the Injection Mold Gate Variations during FRP Injection Molding." Key Engineering Materials 321-323 (October 2006): 938–41. http://dx.doi.org/10.4028/www.scientific.net/kem.321-323.938.

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Because of orientation and separation, injection molded products are heterogeneous and anisotropic. These heterogeneousness and anisotropy have a vast influence on mechanical properties of molding material and product characteristics. It is well known that fiber orientation state in fiber-reinforced polymeric composite has a profound effect on dynamic qualities like intensity, rigidity, and etc. To measure the fiber orientation of injection molded product's weld part, we first X-rayed moldings and recognized this photo by using an image scanner. Then, image processing method, which uses intensity difference in measuring fiber orientation state, is applied. Through these procedures, we can analyze the influence of molding's fiber orientation state according to mold gate changes. Fiber orientation is related mainly with the mold gate positions than with fiber content or mold temperature. When the distance from the gate increases, by matrix and reinforcement's flow speed differences, fiber orientation occurred. As diversion flow occurred at the end of fluid flow, fiber oriented at a right angle to the flow, and this is the same effect of weld line formation.

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45

KIMURA, TOSHIAKI. "The Latest Trend in Rubber Injection Molding. Compounding for Injection Molding." NIPPON GOMU KYOKAISHI 68, no. 2 (1995): 129–37. http://dx.doi.org/10.2324/gomu.68.129.

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46

Insani, Ichlasul, Andoko Andoko, and Yanuar Rohmat Aji Pradana. "Optimization of Injection Pressure and Time of Injection Molding for Eye Drop Heads." TRANSMISI 19, no. 2 (September 1, 2023): 79–83. http://dx.doi.org/10.26905/jtmt.v19i2.10022.

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Injection molding is a plastic production process by injecting liquid plastic into a mold. One of the injection molding products is an eye drop head. Eye drops in its production experienced rejects reaching 37.5% due to defects. The purpose of this optimization is to obtain the optimum setting of injection pressure and time of injection molding machine using RSM. The method to achieve the goal through finite element approach with pre-processing includes design and setting boundary conditions for injection pressure (10.5, 11, and 11.5 MPa) and injection time (1.9, 2.0, and 2.1 seconds). Post processing displays the results of product mass, defects, and quality prediction which are further optimized using RSM to obtain optimum values. The simulation results show that higher injection pressure and lower injection time have given satisfactory results for all three parameters (product mass, defects, and quality prediction) observed. Based on the optimization results, the optimal injection molding settings were obtained at an injection pressure of 11.5 MPa and injection time of 1.9 seconds which resulted in a product mass of 0.429 g, weld line defect of 0.1384, and quality prediction of 80.9%.

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47

Liu, Hang, Yan Xu, Chun Lei Kang, Kai Leung Yung, and Wei Chen. "Comparisons of Different Elastomer Micro Molds." Advanced Materials Research 591-593 (November 2012): 997–1000. http://dx.doi.org/10.4028/www.scientific.net/amr.591-593.997.

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This paper demonstrates the comparisons of molding with micro molds made of different elastomeric polymers. Micro molds made of pure polydimethylsiloxane (PDMS), 0.3% carbon nanotube (CNT) enforced polydimethylsiloxane (PDMS), 2% carbon nanotube (CNT) enforced polydimethylsiloxane (PDMS) and commercial available high temperature silicon rubber sheet (Avon Group) were studied. Micro moldings using different molding pressures were performed. By comparing the dimensions of micro features produced with different molding pressures, molding accuracies of using micro molds made of different elastomeric polymers are obtained. Results of this study provide valuable information for the development of elastomer micro mold insert for micro injection molding.

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48

Zhang, Jia Min, Ming Yi Zhu, and Zhao Xun Lian. "Improvement on Impact Strength of the Nylon 1010 Injection Products with Inlay." Advanced Materials Research 239-242 (May 2011): 1137–40. http://dx.doi.org/10.4028/www.scientific.net/amr.239-242.1137.

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Combining the characteristics of silver inserts, it was tested that its molding process and impact strength from the PA1010 injection molding product's craft. A kind of effective method was found that make sure silver embedded parts not occur surface color as injection heat and determined the reasonable injection molding craft. Meanwhile measuring impact strength of the nylon 1010 injection molding products through the impact test, It was discovered that injection products could well meet the assembly convenient, reliable and the electric conduction needs after inserting the embedded parts in the PA1010 injection molding products. Against molding defects of PA1010 injection molding products and influencing factors of the impact strength, the corresponding analysis was made.

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49

Miao, Li Lei, Peng Cheng Xie, Pan Pan Zhang, and Wei Min Yang. "Numerical Simulation of Differential Injection Molding Based on Moldex 3D." Key Engineering Materials 501 (January 2012): 225–30. http://dx.doi.org/10.4028/www.scientific.net/kem.501.225.

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Differential injection molding is one of the key technologies for micro-manufacture. The mechanism of melt pump based on the differential injection molding is presented. The differential injection molding system is added into the traditional injection machines. Melt is plasticized by the plastication system, then after being split, pressurized and measured by the differential system, it enters the cavity to realize the function of multiple micro injection molding machines. Moldex 3D software is used to simulate the filling history of the micro-structure via differential injection molding technology. The product's filling volume under different processing parameters is compared, which provides theoretical basis for the optimization of the molding parameters in differential injection molding technology.

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50

Yoshida, Kazuto, Kazutoshi Ootsuki, and Koichi Hirose. "Flow Analysis of Insert Molding Using Injection Molding CAE." International Journal of Automation Technology 11, no. 1 (January 5, 2017): 81–83. http://dx.doi.org/10.20965/ijat.2017.p0081.

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Injection molding CAE is employed to analyze the flow process of insert molding. The goals of the analysis are to reduce the number of injection processes required in injection molding, to impart greater added value to the product, and to advance injection molding technology. The importance of an analysis for the weld lines that occur when the mold is filled with plastic and that may lead to lower product quality in addition to an displacements in the insert-molded part due to plastic shrinkage is pointed out. This paper will report about the importance of the previous injection molding CAE for actual fabrication to investigate the product shape design and molding conditions.

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