Bibliografías temáticas / Two component injection molding

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Literatura académica sobre el tema "Two component injection molding"

Autor: Grafiati
Publicado: 4 de junio de 2021
Última modificación: 4 de febrero de 2022

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Artículos de revistas sobre el tema "Two component injection molding"

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Chen, Jyun Yi y Wen Bin Young. "Two-Component Injection Molding of Molded Interconnect Devices". Advanced Materials Research 628 (diciembre de 2012): 78–82. http://dx.doi.org/10.4028/www.scientific.net/amr.628.78.

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Molded Interconnect Device (MID) can be defined as that an injection-molded plastic part combining with electrical and mechanical functions in a single device. This study is to examine the application of micro injection molding technology to the two-component molding process for the MID fabrication. The process involves the first shot of a plastic component with channel patterns on the surface. A second shot by micro injection molding technology is applied to fill the channel with the plateable plastics. The effects of the micro injection molding process parameters on filled line width of the two-component MID will be investigated. It is concluded that, for a MID component, the molding conditions must be designed carefully to keep the thickness variation below the allowable value. It is also found from the experiments that the thickness interference may in the range from 92 m to 196 m to have adequate molding at the second shot.
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Keestra, B. J., P. D. Anderson y H. E. H. Meijer. "Two Component Injection Molding of Phase Separating Blends". International Polymer Processing 21, n.º 2 (mayo de 2006): 168–74. http://dx.doi.org/10.3139/217.1907.

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Bräuer, M., B. Hupfer, J. Nagel y D. Lehmann. "Chemical modification of polyurethane for two-component injection molding". Polymer Engineering & Science 42, n.º 4 (abril de 2002): 859–69. http://dx.doi.org/10.1002/pen.10997.

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Yang, Lung Jieh, Chung Yu Kao y Chin Kwang Huang. "Development of Flapping Ornithopters by Precision Injection Molding". Applied Mechanics and Materials 163 (abril de 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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Antusch, Steffen, Lorelei Commin, Marcus Mueller, Volker Piotter y Tobias Weingaertner. "Two component tungsten powder injection molding – An effective mass production process". Journal of Nuclear Materials 447, n.º 1-3 (abril de 2014): 314–17. http://dx.doi.org/10.1016/j.jnucmat.2013.11.007.

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Ruh, Andreas, Volker Piotter, Klaus Plewa, Hans-Joachim Ritzhaupt-Kleissl y Juergen Hausselt. "Development of Two-Component Micropowder Injection Molding (2C-MicroPIM)-Process Development". International Journal of Applied Ceramic Technology 8, n.º 3 (mayo de 2011): 610–16. http://dx.doi.org/10.1111/j.1744-7402.2009.02468.x.

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Egész, Ádám y László A. Gömze. "Quality Control Methods of Al2O3 Based Ceramic Injection Molding Raw Materials". Materials Science Forum 812 (febrero de 2015): 35–40. http://dx.doi.org/10.4028/www.scientific.net/msf.812.35.

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In the illuminant industry, for producing arc tube parts for high intensity discharge lamps the applied method is the ceramic injection molding. The ceramic arc tube parts are made of high purity alumina powder. By producing ceramic parts, one of the most critical step is to optimizing the injection molding process, [1] but first of all we need to know the properties of injection molding raw material, because later the molding process will be optimized for this material, to decrease the amount of cracked ceramics.For producing ceramic arc tube parts (plugs), there are used two different major components for producing injection molding raw material (feedstock): high purity alumina powder as the main component, and an organic paraffin wax as a binder material. It is expressly important to know the material, physical and chemical properties of these components, since mainly these have affect on the homogenity of feedstock, and therefore on the quality of end product. [3]In this research, both of the main components and the moldable raw material was investigated by visual, physical, chemical and thermal methods. As most important and main statement, the researchers found that the dynamic viscosity of the injection molding raw material depends on the used mixer equipment and the applied deformation velocity.Applied analitycal methods were laser granulometry, differential thermal analysis, and rheological analysis.
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Goharian, Amirhossein, Ahmad Ramli Rashidi, Mohammed Rafiq Abdul Kadir, R. A. Abdullah y Mat Uzir Wahit. "Development of Novel Polymer Composite Beam Using Ultrasonic Welding Process for Acetabular Cup Prosthesis". Key Engineering Materials 471-472 (febrero de 2011): 945–50. http://dx.doi.org/10.4028/www.scientific.net/kem.471-472.945.

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The objective of this study was to prepare a basic contributed model in beam to examine this novel composition supposed to apply for acetabular cup. Injection molding process used to manufacture of the component whereas ultrasonic welding was utilized to joint two components. Molding and welding value parameters were carried out by trial and error process. Strength bonding of two components was evaluated by single cantilever beam (SCB) test. The Interfacial fracture energy attained by single cantilever beam (SCB) test was exceeded over 1800 after 70 mm crack propagation.
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Ruh, Andreas, Adam-Mwanga Dieckmann, Richard Heldele, Volker Piotter, Robert Ruprecht, Christian Munzinger, Jürgen Fleischer y Jürgen Haußelt. "Production of two-material micro-assemblies by two-component powder injection molding and sinter-joining". Microsystem Technologies 14, n.º 12 (4 de junio de 2008): 1805–11. http://dx.doi.org/10.1007/s00542-008-0646-8.

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Holstein, N., V. Piotter, J. Lorenz, E. Oskotski, R. Ruprecht, G. Schanz y J. Hausselt. "Electroforming of Metallic Microparts on Sacrificial Molds made by Two-component Injection Molding". Advanced Engineering Materials 6, n.º 8 (agosto de 2004): 643–53. http://dx.doi.org/10.1002/adem.200400028.

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Tesis sobre el tema "Two component injection molding"

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Karsono, Dudhi. "Two-component injection molding : study on thermoplastic and rubber (T/R) combination /". Connect to resource, 1998. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1188322477.

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Karsono, Dudhi. "Two-component injection molding: study on thermoplastic and rubber (T/R) combination". The Ohio State University, 1997. http://rave.ohiolink.edu/etdc/view?acc_num=osu1188322477.

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Hernández, Aguilar José Ramón. "Computational and experimental evaluation of two models for the simulation of thermoplastics injection molding". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/MQ64224.pdf.

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Härtig, Thomas. "Stoffübertragung beim Spritzgießen". Doctoral thesis, Universitätsbibliothek Chemnitz, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-108290.

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Das Fügen mehrerer Komponenten während des Spritzgießprozesses wird bei vielen Spritzgießsonderverfahren angewandt. Diese Arbeit beschäftigt sich mit der Verbundbildung zwischen einem kalten Einlegeteil und der einströmenden Kunststoffschmelze beim Spritzgießen, im Folgenden Stoffübertragung genannt. Ein Großteil der Untersuchungen findet an Zweikomponenten-Zugstäben statt, wobei erste und zweite Komponente aus dem gleichen Thermoplast gefertigt werden. Mögliche Einflussfaktoren auf die Verbundfestigkeit werden zunächst im Theorieteil vorgestellt und diskutiert. Eine Auswahl relevanter Prozess- und Materialparameter wird dann in praktischen Versuchen detailliert analysiert. Es wird nach korrelierenden Tendenzen sowohl zwischen unterschiedlichen Verfahren als auch zwischen verschiedenen Kunststoffen gesucht. Mittels statistischer Versuchsplanung werden die Spritzgießparameterkombinationen nach Größe des Einflusses auf die Verbundfestigkeit sortiert. Dies trägt zum Verständnis der bei der Stoffübertragung ablaufenden Grundmechanismen bei. Weiterhin werden die Einflüsse der Prozessparameter auf das neue Verfahren der In-Mold Oberflächenmodifizierung, bei dem ein funktionaler Modifikator während des Spritzgießprozesses übertragen wird, mit den Ergebnissen der Zweikomponenten-Verbundfestigkeit verglichen. Abschließend wird auf die Besonderheiten bei der selektiven Stoffübertragung eingegangen und das neue Verfahren des In-Mold Printing vorgestellt
The joining of two components by the process of injection molding is state of the art, although adhesion phenomena are not fully understood yet. The formation of bonds between a cold material, which was inserted or applied onto the surface of the cavity before injection molding, and an injected polymer melt is studied in this work. Providing sufficient bond strength, the material is transferred from the surface of the mold to the injection molded part. Possibly influencing factors on the bond strength are first identified, theoretically discussed, later in experiments varied and finally analyzed. Thereby correlating tendencies between different polymers and different in-mold technologies are observed. The relevant material and processing parameters are put in order by their influence on the bond strength using design of experiments. This helps to understand the mechanisms of the formation of bonds. The majority of the experiments is concerned with two component injection molding by measuring the bond strength of two component tensile bars, produced under varying processing conditions. In each case, first and second components are made of the same thermoplastic polymer. The thermal energy of the melt can be used also to initiate chemical reactions. This permits bonding of a thin layer of a functional polymer, which is applied onto the surface of the mold before injecting the melt, to the surface of the molded part. In this way, process-integrated surface modification during injection molding becomes possible. In a further attempt, patterns of paint are printed onto the surface of the mold by pad printing. During injection molding the paint is transferred completely to the surface of the polymeric part. Using this new technology of In-Mold Printing, fully finished surface decorated parts can be produced by injection molding
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Handlos, Agnita A. "The processing of microcomposites based on polypropylene and two thermotropic liquid crystalline polymers in injection molding, sheet extrusion, and extrusion blow molding". Diss., This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-06062008-164735/.

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Alahmad, Malik I. N. "Heat transfer in upward flowing two-phase gas-liquid mixtures : an experimental study of heat transfer in two-phase gas-liquid mixtures flowing upwards in a vertical tube with liquid phase being driven by a pump or air injection". Thesis, University of Bradford, 1987. http://hdl.handle.net/10454/3629.

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An experimental investigation has been carried out to study the heat transfer in a two-phase two-component mixture flowing upward inside a 1" double pipe heat exchanger. The heat transfer coefficient was measured using either air to lift the liquid (air-lift system) or a mechanical pump. The heat transfer coefficient results have been extensively studied and compared with other workers' results. An attempt was made to correlate the present heat transfer data in dimensionless correlations. Possible factors affecting the two-phase heat transfer coefficient have been studied with special attention being given to the fluid properties, particularly the liquid viscosity. Experiments were also carried out to investigate the effect of solid particles added to a liquid flow on the measured heat transfer coefficient. The present investigation was carried out using air as the gas-phase ranging from 2x 10-5 up to 80 x 10-5 m3/s. Liquids used were water and glycerol solutions with viscosity ranging from 0.75 up to 5.0 C. P. and flowrates between 4x 10-5 and 25 x 10-5 m3/s. Void fraction and pressure drop were also measured during the heat transfer process. Flow pattern in gas-liquid mixture was investigated in a perspex tube of identical dimensions to the heat exchanger tube.
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Vinberg, Karl y Lukas Klevtun. "Etablering av strategier och rutiner för seriestorlekar : En fallstudie på Företag X". Thesis, Linnéuniversitetet, Institutionen för ekonomistyrning och logistik (ELO), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-104999.

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Purpose: The purpose of the study is to identify, design and apply a method for operational production planning. The purpose of the method is that it takes into account the respective demand patterns of the articles, which determines the choice of calculation model and that the method also takes into account the production capacity limitation set. The result can be applied as a basis for decision-making for small and medium-sized manufacturing companies that are facing an expansion. Objective: The following research question was the main objective of this study.How would an appropriate operational planning method be shaped according to the specific characteristics of the products and their diverse demand patterns in small and medium-sized manufacturing companies with capacity limiters? Method: The study is a qualitative one-case study with quantitative elements. The empirical data used in the study was collected through unstructured and semi-structured interviews where the snowball effect has been applied and also observations have been performed. Results: The study has enabled a higher degree of utilization of the capacity limitation set, by developing standardized block sizes. The first step was to identify demand patterns into which the studied articles could be categorized. The demand pattern was applied in order to be able to apply the correct calculation model to the correct article. The calculation model was then standardized by applying PoT to be able to obtain standardized block sizes. The method was illustrated in a Gantt chart to demonstrate its usefulness.
Syfte: Studiens syfte är att identifiera, utforma och applicera en metod för operativ produktionsplanering. Ändamålet med metoden är att den tar hänsyn till artiklarnas respektive efterfrågemönster vilket avgör valet av beräkningsmodell samt att metoden tar även hänsyn till produktionens kapacitetsbegränsning ställare. Resultatet kan appliceras som beslutsunderlag för små samt medelstora tillverkande företag som står inför en expansion. Forskningsfråga: Följande forskningsfråga var objektet för denna studie. Hur skulle en lämplig operativ planering formas utefter artiklarnas specifika egenskaper och deras olikartade efterfrågemönster hos små och medelstora tillverkande företag med kapacitetsbegränsningen ställare? Metod: Studien är en kvalitativ en-fallstudie med kvantitativa inslag. Den empiriska data som använts i studie än insamlad genom ostrukturerade samt semistrukturerade intervjuer där snöbollseffekten tillämpats och även observationer har utförts. Resultat: Studien har möjliggjort en högre utnyttjandegrad av kapacitetsbegränsningen ställare, genom att framta standardiserade blockstorlekar. Första steget var att identifiera efterfrågemönster som de studerade artiklarna kunnat kategoriseras in i. Efterfrågemönstret har tillämpats för att kunna använda rätt beräkningsmodell på rätt artikel. Beräkningsmodellen standardiserades därefter genom tillämpning av PoT för att kunna erhålla standardiserade blockstorlekar. Metoden illustrerades i ett Gantt-schema för att påvisa dess användbarhet.
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Jyun-yiChen y 陳駿逸. "Two-component injection molding of molded interconnect devices". Thesis, 2011. http://ndltd.ncl.edu.tw/handle/43412954579878389594.

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Cheng, Nien Tien y 鄭年添. "Study of the Post-Filling Stage in Two-Component Injection Molding Process". Thesis, 1996. http://ndltd.ncl.edu.tw/handle/67074043625314464145.

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博士
中原大學
機械工程研究所
84
The purpose of this research is to conduct a preliminary sutdy concerning the characteristics of the post-filling process of two-component injection molding process, namely co-injection molding process and gas-assisted injection molding, in order to investigated the effect of processing and the design parameters on their molding processes and part quality. This research firstly focuses on the investigation of the progression for both skin and core melt fronts during the post-filling process. Experimental studies of polymer melt flow in the post-filling stage of co-injection molding process have been performed using the sequential injection of transparent and colored polystyrene resin. During the post-filling process, polymer melt flows significantly and the amount of melt flow increases with increasing packing pressure. Also, the polymer melt flow is more concentrated around the cavity location near the gate area and is less distinguished far away from the gate. A layer control volume/FEM and tripl-filling-parameter algorithm employed within each grid layer in the gapwise direction are applied to trace the melt fronts advancement for both skin and core materials during the post-filling process. Numerical simulation shows good consistency with experimental results in both skin and core material distributions. If the edge effect is taken into account using a shape factor as a geometric correction and melt frozen effect is considered, the simulation accuracy is further improved. Secondly, numerical simulations and experimental studies of gas penetration and melt flow are carried out during gas-assisted injection molding. Distribution of the skin melt thickness along gas penetration path is described as a simple model of two phase flow. A simple formulation based on non-isothermal power-law fluid model is derived in order to evaluate the effect of various processing parameters as well as melt rheological behavior on the skin melt formation. Skin melt thickness ratio
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Wu, Chi-Hsin y 吳奇欣. "The Study of Two-Component Injection Molding Process by Applications of Computer-Aided Engineering". Thesis, 2009. http://ndltd.ncl.edu.tw/handle/06365559746442702943.

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碩士
中原大學
機械工程研究所
97
Abstract Product design becomes more personalized as the time advanced, it should be designed pretty appearance by using various colors such as cell phones, electric watches etc. For the sake of it, we provide several varieties tooling designs in injection process; two-component tooling is widely used in the production by many injection factories now. In order to have more competitive advantages, the academy and industry are indulged in the researches of exact injection process in recent years. There are many different parameters related about fluidity of plastic-melted parts in each kind of injection process, such as pressure, temperature, time etc. Engineers should research the real parameters about the injection process by CAE moldflow analysis software to develop the fine goods rapidly. If so, the cost and time-elapsed will be dramatically reduced. This study is a research of the design for audio two-component plastic panel. Firstly, referring the two-component plastic product of audio two-component panel, we build and construct 3D designs by using computer-aided design software Pro/Engineer, then we construct mold flow analysis based on different controlled parameters. Secondly, referring the actual two-component plastic products of audio two-component panel, we choose the resin of Polycarbonate and Polycarbonate/ABS whose characteristics are good shock endurance, good transparency, high dimension stability after shaping, nonpoisonous property as our study object, then the optima parameters will be found by Taguchi method coordination and software of Moldflow in this study. The temperature of the first product of mold is suggested 100℃, the temperature of polymer melt is set by 320℃, the time of filling is 1.1 second. The temperature of the second product of mold is suggested 80℃, the temperature of polymer melt is set by 270℃, and the time of filling is 0.9 second. It is confirmed by checking examples of stereo faceplate with two-color injection method with the simulations from software, so the old try-and-error method could be replaced for the sake of profits and efficiency.
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Libros sobre el tema "Two component injection molding"

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Ehritt, J. Schroeder K. Gas Injection and Two Component Injection Moulding. Huthig Pub Ltd, 1995.

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Capítulos de libros sobre el tema "Two component injection molding"

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Shutov, Fjodor A., G. Henrici-Olivé y S. Olivé. "Injection Molding: Two-Component Process". En Integral/Structural Polymer Foams, 81–91. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-662-02486-7_7.

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Carvalho, Marcio A., Paulo A. P. Wendhausen y T. Hartwig. "Production of Composite Parts of H13 and 316L by Two Components Injection Molding". En Materials Science Forum, 236–41. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-423-5.236.

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Gooch, Jan W. "Two-Shot Injection Molding". En Encyclopedic Dictionary of Polymers, 776. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_12261.

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Yang, Yi, Xi Chen, Ningyun Lu y Furong Gao. "Two-Dimensional Control Algorithms". En Injection Molding Process Control, Monitoring, and Optimization, 109–48. München: Carl Hanser Verlag GmbH & Co. KG, 2016. http://dx.doi.org/10.3139/9781569905937.004.

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Zhou, Jin-ping y Hu Fu. "Optimization of Injection Molding Shop Scheduling Based on the Two-Stage Genetic Algorithm". En The 19th International Conference on Industrial Engineering and Engineering Management, 59–69. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-37270-4_6.

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Chen, Chao Chang A. y Shi Chi Kao. "A Study of Two-Stage Micro Injection Compression Molding Process for Diffractive Optical Lens". En Optics Design and Precision Manufacturing Technologies, 1211–14. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-458-8.1211.

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Zheng, Zhoushun y Xuanhui Qu. "The Fundamental Equation of Two-Dimensional Layer Flows of the Melt Feedstock in the Powder Injection Molding Process". En Recent Progress in Computational and Applied PDES, 421–27. Boston, MA: Springer US, 2002. http://dx.doi.org/10.1007/978-1-4615-0113-8_29.

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Han, Chang Dae. "Reaction Injection Molding". En Rheology and Processing of Polymeric Materials: Volume 2: Polymer Processing. Oxford University Press, 2006. http://dx.doi.org/10.1093/oso/9780195187830.003.0017.

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Reaction injection molding (RIM) is a thermoset processing operation during which the incoming feedstream(s) undergo cure reactions that give rise to a three-dimensional network structure (Becker 1979; Macosko 1989). Different from the operation of injection molding thermoplastic polymers presented in Chapter 8, in RIM operation the component(s) must cure rapidly (say, within 90 seconds) and a finished product is removed in 1−10 minutes, depending on the chemical systems, the part thickness, and the capabilities of the processing machine. The chief advantages of RIM over the injection molding of thermoplastic polymers are: (1) large parts can be produced at low energy consumption, (2) large parts with varying cross sections with or without inserts can be produced without the problem of sink marks, and (3) lightweight parts, owing to the microcellular structure, can be produced. However, the predominant industrial applications are in the automotive industry; for instance, in the production of automobile fascia. In the 1970s and 1980s, very intensive research activities were reported on a better understanding of the RIM operation. Thermosets must meet with some stringent requirements for RIM operation. These are: (1) viscosities must be fairly low at processing temperature, so that a rapid injection of the feedstreams can be realized; (2) the feedstreams must have sufficient compatibility for efficient mixing by the static impingement mixing technique; (3) cure reaction must be sufficiently fast, such that a finished product can be removed in a very short time after injection is completed; (4) a finished product must have sufficient stiffness and resiliency at elevated temperatures; and (5) a finished product must be released easily from the mold surface, etc. It is then clear that not many thermosets meet these requirements. It has been found that urethanes, with proper chemistry of the components, meet with the requirements. For this reason, urethanes have been the most widely used resin for RIM, although other thermosets (e.g., epoxy) have also been used to some extent.
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Lourenço, Emanuel João, Nuno Moita, Sílvia Esteves, Paulo Peças, Inês Inês Ribeiro, João Paulo Pereira y Luís Miguel Oliveira. "Multi-Perspective Eco-Efficiency Assessment to Foster Sustainability in Plastic Parts Production". En Handbook of Research on Green Engineering Techniques for Modern Manufacturing, 212–49. IGI Global, 2019. http://dx.doi.org/10.4018/978-1-5225-5445-5.ch012.

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The eco-efficiency assessment is a powerful metric to introduce two components of sustainability assessment in the industrial companies' decisions making: the concurrent consideration of economic and environmental performance. The application of the eco-efficiency concept and of the normative documents is not an easy task, mainly because there are myriad environmental related indicator to consider and acquire. This barrier is higher in the realm of plastic injection molding, where each mold is unique, requiring a recurrent effort of data retrieving for such one-of-a-kind molds. To overcome this barrier, an integrated framework to support the eco-efficiency calculation on a life cycle perspective for a specific type of products, injection molds, is proposed in this chapter. It retrieves a small but representative selected set of eco-efficiency performance indicators. A tool was developed to apply the proposed framework and the results of its application to four real industrial case studies is discussed.
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Han, Chang Dae. "Rheology of Molten Polymers with Solubilized Gaseous Component". En Rheology and Processing of Polymeric Materials: Volume 1: Polymer Rheology. Oxford University Press, 2007. http://dx.doi.org/10.1093/oso/9780195187823.003.0019.

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Polymer melts (or polymer solutions) with a solubilized gaseous component (which occur under sufficiently high pressures, thus forming homogeneous mixtures), and polymer melts (or polymer solutions) with dispersed gas bubbles (thus forming heterogeneous mixtures of polymeric fluid and gas bubbles) are encountered in thermoplastic foam processing and polymer devolatilization. Thus, a good understanding of the rheological behavior of such mixtures is very important to the design of processing equipment and successful optimization of such polymer processing operations. From the 1950s through the 1970s, the dynamics of a single, spherical gas bubble dispersed in a stationary Newtonian or viscoelastic medium was extensively reported in the literature (Barlow and Langlois 1962; Duda and Vrentas 1969; Epstein and Plesset 1950; Folger and Goddard 1970; Marique and Houghton 1962; Plessst and Zwick 1952; Rosner and Epstein 1972; Ruckenstein and Davis 1970; Scriven 1959; Street 1968; Street et al. 1971; Tanasawa and Yang 1970; Ting 1975; Yang and Yeh 1966; Yoo and Han 1982; Zana and Leal 1975). While such investigations are of fundamental importance in their own right, they are not much help to describe bubble dynamics in thermoplastic foam extrusion or structural foam injection molding, for instance. There is no question that an investigation of bubble dynamics in a flowing molten polymer with dispersed gas bubbles is a very difficult subject by any measure. Thus, understandably, a relatively small number of research publications on bubble dynamics in a flowing molten polymer have been reported (Han and Villamizar 1978; Han et al. 1976; Yoo and Han 1981). The complexity of the problem arises from other related issues, such as the solubility and diffusivity of gaseous component(s) in a flowing molten polymer, which in turn depend on temperature and pressure of the system. Further, a gaseous component solubilized in molten polymer in the upstream side of a die, for instance, may nucleate as the pressure of the fluid stream decreases along the die axis, after which they could grow continuously as the molten polymer with dispersed gas bubbles flows through the rest of the die.
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Actas de conferencias sobre el tema "Two component injection molding"

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Becker, Holger y Claudia Gärtner. "Two-component injection molding for micofluidic devices". En SPIE MOEMS-MEMS, editado por Holger Becker y Bonnie L. Gray. SPIE, 2012. http://dx.doi.org/10.1117/12.910574.

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Gasworth, Steven M., Vasudev Nilajkar y Matteo Terragni. "Two-Component Injection Molding as a Noise Countermeasure for Polycarbonate Glazing". En Noise and Vibration Conference and Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2017. http://dx.doi.org/10.4271/2017-01-1817.

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Fetecau, Catalin, Felicia Stan, Daniel Dobrea, Francisco Chinesta, Yvan Chastel y Mohamed El Mansori. "Investigation of the adhesion interface obtained through two-component injection molding". En INTERNATIONAL CONFERENCE ON ADVANCES IN MATERIALS AND PROCESSING TECHNOLOGIES (AMPT2010). AIP, 2011. http://dx.doi.org/10.1063/1.3552531.

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Johnson, John L., Lye King Tan, Pavan Suri y Randall M. German. "Metal Injection Molding of Multi-Functional Materials". En ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-41151.

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Metal injection molding (MIM) enables processing of multi-functional components with combinations of properties including, magnetic and non-magnetic; magnetic response and corrosion resistance; controlled porosity and high thermal conductivity; high inertial weight and high strength; high thermal conductivity and low thermal expansion coefficient; wear resistance and high toughness; high thermal conductivity and good glass-to-metal sealing; high elastic modulus and high damping capacity; and magnetic response and electrical resistance. Such materials can be processed by MIM by co-injection molding and co-sintering, but compositions and sintering cycles must be optimized to minimize stresses arising from shrinkage mismatch while providing the desired properties To determine compatible combinations, individual materials, including various stainless steels and tool steels are mixed with a thermoplastic binder and injection molded. Debound components are subjected to dilatometry to determine dimensional change during sintering. The compatibility of these materials is predicted based on calculations of the thermal stress during co-sintering of concentric rings. For this geometry, shrinkage mismatches result in both radial stresses, which are the highest at the interface and lead to interfacial separation, as well as hoop stresses, which lead to radial cracking. These stresses are dependent on the thicknesses of the inner and outer rings. Defect-free components can be produced when the tensile hoop stresses do not exceed the intrinsic strengths of the component materials. Based on the dilatometry results, low stresses are predicted between a combination of magnetic and non-magnetic stainless steel and between a combination of austenitic stainless steel and tool steel. Example MIM bi-material components are processed from these combinations. The magnetic properties of the tough/wear-resistant bi-material are measured. General predictions and processing guidelines for other multi-functional materials are given.
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Heaney, Donald F. "Powder Injection Molding of Implantable Grade Materials". En ASME 2006 International Manufacturing Science and Engineering Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/msec2006-21049.

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In this paper the attributes of powder injection molding that influence the ability to implant a material are evaluated. Specific emphasis is given to technology readiness of stainless steel, titanium and cobalt chromium alloys since these are the most common alloys that are both implantable and metal injection moldable. Issues such as ductility and strengthening are discussed. Also, component size capability of the technology is discussed since prosthetic replacement pushes the upper size limit of the technology and implantable micro devices that require MEMS (MicroElectroMechanical Systems) scale features push the lower limit.
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Six, W., G. J. Bex, J. De Keyzer, F. Desplentere y A. Van Bael. "A novel method for the prediction of adhesive strength for two-component injection molding of thermoplastics with thermoset rubbers". En PROCEEDINGS OF THE EUROPE/AFRICA CONFERENCE DRESDEN 2017 – POLYMER PROCESSING SOCIETY PPS. Author(s), 2019. http://dx.doi.org/10.1063/1.5084864.

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Mehl, Douglas C., Kurt A. Beiter y Kos Ishii. "Design for Injection Molding: Using Dimensional Analysis to Assess Fillability". En ASME 1994 Design Technical Conferences collocated with the ASME 1994 International Computers in Engineering Conference and Exhibition and the ASME 1994 8th Annual Database Symposium. American Society of Mechanical Engineers, 1994. http://dx.doi.org/10.1115/detc1994-0085.

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Abstract This paper addresses the determination of wall thicknesses and gating schemes in the preliminary design of injection-molded plastic parts. Today, most of the existing design guidelines come in the form of experience-based qualitative rules. If the designers already have a detailed geometry of the part, the numerical process simulation program provides another form of design aid. There exists a huge gap between these two types of design aids; the experience-based guidelines are often too vague, while the process simulation programs come too late to impact preliminary part design. To fill this gap, this paper develops physics-based guidelines that utilize dimensional analysis techniques. Experiments and simulation studies can deduce non-dimensional relationships between flow length, thickness, material, and process parameters. The guidelines will aid plastic component designers in determining wall-thickness, gating schemes, and in selecting the material in the preliminary stages of part design. This paper describes the formulation of the non-dimensional charts for fillability assessment, and explains the use of these charts in part design. We further outline an ongoing experimental program to validate and refine our formulation.
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Hu, Weiyi y Corrado Poli. "To Injection Mold, to Stamp, or to Assemble? Part I — A DFM Cost Perspective". En ASME 1997 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/detc97/dtm-3895.

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Abstract This paper presents a DFM cost comparison of injection molding and stamping, the processes most commonly used in the production of consumer oriented special purpose components. The general guidelines obtained and conclusions drawn in order to determine if a component should be injection molded or stamped, and/or if several components should be combined into a single component or not, are discussed. The cost evaluation and comparison are primarily in terms of the functional equivalence of feature, component, and assembly.
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Lorin, Samuel, Lars Lindkvist y Rikard Söderberg. "Simulating Part and Assembly Variation for Injection Molded Parts". En ASME 2012 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/detc2012-70659.

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Final geometrical variation and deviation have often a negative effect on product functionality and aesthetics. In the automotive industry, design concepts are being evaluated and optimized to withstand variation in the early phase of product development. For this end, simulation tools are employed. Input to these simulations is requirements on parts and fixtures or measurements from previously manufactured parts. In the case of plastic components, parts are often manufactured in the injection molding process. Here, different materials and process settings can make it difficult to predict deviation and variation based on similar parts. In order to perform accurate assembly variation simulation, part variation simulation need, therefore, to be included. In this work a methodology is presented to simulate part and assembly variation, due to process noise, for plastic components manufactured in the injection molding process. The methodology is based on designed computer experiment and utilizes the concept of geometrical covariance and principal component analysis to relate process noise to variation patterns using regression analysis. Part and assembly variation are simulated combined using the distribution of these variation patterns. The model used for part variation simulation has been verified against commercial injection molding software showing good agreement. An industrial case from the automotive industry is used to elicit the proposed methodology.
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10

Rosen, David W., John R. Dixon, Corrado Poli y Xin Dong. "Features and Algorithms for Tooling Cost Evaluation in Injection Molding and Die Casting". En ASME 1992 International Computers in Engineering Conference and Exposition. American Society of Mechanical Engineers, 1992. http://dx.doi.org/10.1115/cie1992-0006.

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Abstract Design-for-manufacturability tools for thin-walled mechanical components are being developed and integrated into a feature-based design system. This paper presents recent work on automatically evaluating injection molded and die cast components for tooling cost. The methodology for evaluation is to convert a design features representation of a component into a tooling cost features representation, then compute cost drivers from the features. Evaluation can be done directly from the cost drivers using cost data in tables. The critical tooling cost features were derived from tooling cost drivers reported in previous work. The tooling cost features and cost drivers are listed, and definitions and algorithms for conversion from design-with to tooling cost features are given. At the end, conclusions are drawn on the feasibility of feature conversion and feature-based tooling cost evaluation, based on the design-with features approach.
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