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Journal articles on the topic 'Injection molding of plastics'

Author: Grafiati

Published: 4 June 2021

Last updated: 30 July 2024

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1

Ragan, Emil, Petr Baron, and Jozef Dobránsky. "Sucking Machinery of Transport for Dosing Granulations of Plastics at Injection Molding." Advanced Materials Research 383-390 (November 2011): 2813–18. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.2813.

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Advantageous properties of plastic materials, low investment costs for a production, cheap and productive processing method were given the rapid development of plastic materials. In this time injection molding technology is the most using technology for processing plastics in our country. Quality of the plastics processing depends mainly on the quality of material and preparing it for production. The first step in the processing of plastic by injection molding is dosing of granulations from hopper of injection machine unit. Task of this contribution is to theoretically describe a pneumatic method for transport of granulations in injection molding machine.

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2

Jin, Jie, H. Y. Yu, and S. Lv. "Optimization of Plastic Injection Molding Process Parameters for Thin-Wall Plastics Injection Molding." Advanced Materials Research 69-70 (May 2009): 525–29. http://dx.doi.org/10.4028/www.scientific.net/amr.69-70.525.

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The effects of the process parameters on the warpge and shrinkage of parts in different thickness are analyzed by Taguchi optimization method. Taguchi optimization method was used for exploiting mold analysis based on three level factorial designs. Orthogonal arrays of Taguchi, the signal-to-noise (S/N) ratio, the analysis of variance (ANOVA) are utilized to find the optimal levels and the effect of process parameters on warpage. It can be concluded that Taguchi method is suitable to solve the quality problem of the injection-molded thermoplastic parts.

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3

Huang, Yi Jun. "The Applied Study Based on the Injection Molding Mechanism of Microcellular Foamed Plastics (MCFP)." Applied Mechanics and Materials 709 (December 2014): 374–79. http://dx.doi.org/10.4028/www.scientific.net/amm.709.374.

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Injection molding is one of several molding technology of microcellular foamed plastics. This paper mainly discusses the injection molding mechanism and applications of microcellular foamed plastics here, and analyzes the influence of microcellular foamed plastics injection molding process parameters, including injection pressure, melt temperature, injection time, etc.; At the same time, this paper makes a more systematic discussions for the injection molding technology of microcellular foamed plastics, and the typical cases of microcellular foamed plastics in engineering application are introduced in detail.

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4

Wagner, Alan H., Jeong S. Yu, and Dilhan M. Kalyon. "Injection molding of engineering plastics." Advances in Polymer Technology 9, no. 1 (1989): 17–32. http://dx.doi.org/10.1002/adv.1989.060090103.

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5

Zhang, Qing Wen, Ying Jie Xu, Wei Hong Zhang, and Jun Wang. "Integrative Analysis of the Injection Molding Process and Mechanical Behavior of Plastic Part." Advanced Materials Research 705 (June 2013): 181–86. http://dx.doi.org/10.4028/www.scientific.net/amr.705.181.

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For parts made of plastics, injection molding is a common manufacturing process. Warpage and residual stress induced during the injection molding process have very important influences on the mechanical performance of injection products. In this paper, an integrative analysis of the injection molding process and mechanical performance of plastic parts is proposed. This integrative approach incorporates the effects of the manufacturing process in the mechanical simulation: (a) firstly, the finite element package MoldFlow is used to simulate the injection molding process and obtain the warpage and residual stress results. (b) Then the finite element model of plastic part including the process induced warpage and residual stress is established. Explicit dynamic finite element program LS-DYNA is used to simulate the mechanical behaviors of the molded part. Based on the integrative analysis, the influences of injection molding process parameters on mechanical behavior of a PC windshield against impact loading are studied.

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6

Koo, Lih Zhang, Douglas Kum Tien Tong, and Matias Rinne. "Community Waste Plastic Recycling System Through Plastic Injection Molding." MATEC Web of Conferences 335 (2021): 03009. http://dx.doi.org/10.1051/matecconf/202133503009.

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High demand for plastic worldwide has resulted in increasing environmental pollution. To make the plastic manufacturing process more environmentally friendly, recycling of waste plastic must be considered. In view of this a social enterprise called Me.reka Makerspace aims to use waste plastic to produce recycled plastic products using injection molding. However, injection molding is a complex process. In the past Me.reka experienced numerous failures resulting in defective plastic products and cost wastage. To assist with Me.reka’s objective, this study aimed to recommend a process capable of producing good quality recycled plastic products that meet dimensional accuracy and surface roughness requirements. Literature review done on plastic waste separation techniques, plastic properties testing for injection molding, and ventilation systems. Manual plastic sorting was found to be the best for Me.reka, where it can separate all 7 types of plastics collected by Me.reka with the highest accuracy and efficiency and the lowest cost. The melt flow rate of specific plastic type can determine its compatibility for use in the injection molding machine. Furthermore this study found that the best ventilation system for Me.reka Makerspace’s plastic injection molding facility was the displacement ventilation. It is expected that with the installation of an efficient ventilation system, the hazardous gasses produced during the process will be efficiently expelled thus protecting the health of workers. With regards to injection molding, a mold design was made for a book cover mold by applying the applicable mold design principles. However, this mold was later sent for testing at another facility. A flowerpot mold that had arrived at Me.reka which required immediate testing was tested instead. Through testing, improvements were made to the mold and the molding process by finding out the optimum injection molding temperature for the waste plastic used and the mold sprue diameter required to produce a well formed molding.

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7

Chen, Jyun Yi, and Wen Bin Young. "Two-Component Injection Molding of Molded Interconnect Devices." Advanced Materials Research 628 (December 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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8

Masato, Davide, Leonardo Piccolo, Giovanni Lucchetta, and Marco Sorgato. "Texturing Technologies for Plastics Injection Molding: A Review." Micromachines 13, no. 8 (July 29, 2022): 1211. http://dx.doi.org/10.3390/mi13081211.

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Texturing is an engineering technology that can be used to enable surface functionalization in the plastics injection molding industry. A texture is defined as the geometrical modification of the topography by addition of surface features that are characterized by a smaller scale than the overall surface dimensions. Texturing is added to products to create novel functionalities of plastic products and tools, which can be exploited to modify interactions with other materials in contact with the surface. The geometry, dimensions, and positioning on the surface define the function of a texture and its properties. This work reviews and discuss the wide range of texturing technologies available in the industry. The advantages and limitations of each technology are presented to support the development of new surface engineering applications in the plastics manufacturing industry.

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9

Czepiel, Mateusz, Magdalena Bańkosz, and Agnieszka Sobczak-Kupiec. "Advanced Injection Molding Methods: Review." Materials 16, no. 17 (August 24, 2023): 5802. http://dx.doi.org/10.3390/ma16175802.

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Injection molding is a method commonly used to manufacture plastic products. This technology makes it possible to obtain products of specially designed shape and size. In addition, the developed mold allows for repeated and repeatable production of selected plastic parts. Over the years, this technology grew in importance, and nowadays, products produced by injection molding are used in almost every field of industry. This paper is a review and provides information on recent research reports in the field of modern injection molding techniques. Selected plastics most commonly processed by this technique are discussed. Next, the chosen types of this technique are presented, along with a discussion of the parameters that affect performance and process flow. Depending on the proposed method, the influence of various factors on the quality and yield of the obtained products was analyzed. Nowadays, the link between these two properties is extremely important. The work presented in the article refers to research aimed at modifying injection molding methods enabling high product quality with high productivity at the same time. An important role is also played by lowering production costs and reducing the negative impact on the environment. The review discusses modern injection molding technologies, the development of which is constantly progressing. Finally, the impact of the technology on the ecological environment is discussed and the perspectives of the process were presented.

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10

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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11

Abd Aziz, Ahmad Aizuddin Bin, Shamsuddin Sulaiman, Aung Lwin Moe, and Aminudin bin Abu. "Investigation of Plastic Injecting Moulding Process Optimization in Complex Shape Product." Applied Mechanics and Materials 695 (November 2014): 260–64. http://dx.doi.org/10.4028/www.scientific.net/amm.695.260.

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Nowadays, plastic injection molding is widely used in the production of very complex parts and it enables to produce numerous parts within one cycle. Molding conditions or process parameters are crucial for productivity and quality of desired products. This research aims to investigate the state-of-the-art approach to find optimal parameters characteristics in plastic injection molding process. Fill time, average velocity, pressure, clamp force, cooling time and volumetric shrinkages are selected as process parameters in this research. Nokia 6680 model is used for revealing process optimization. Two case studies based on two plates and three plate moulding layout are conducted to suggest the plastic injection mold optimization process. The process parameters of two proposed layouts are compared based on Mold flow Plastics Insight (MPI) analysis results. Result show that three plate moulding satisfy not only the process quality but also the product quality characteristics in this injection moulding process.

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12

Ajala, M. O. "Review of Design and Production of the Injection Moulding Machine." Journal of Mechatronics Machine Design and Manufacturing 5, no. 2 (August 29, 2023): 38–50. http://dx.doi.org/10.46610/jmmdm.2023.v05i02.005.

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Plastics are being employed for both light and heavy items in industrial settings more and more often. Plastic daily objects like bottle caps, remote control casings, needles, and more are created using injection molding equipment, along with large goods like automotive body panels. During the molding process, a liquid or flexible raw material is shaped using a rigid structure known as a mold. This technique originally became popular during the Second World War as the need for mass-produced items increased. It is now extensively utilized across various industries. This study examined the role of plastic molding machines in the design and production of these devices. To correctly examine the corpus of knowledge about the design and production of plastic molding machines, this was done by comparing and assessing already published, widely available works, beginning with early innovations and continuing with more recent advancements. The study's objective was met. Despite rising efforts to design and construct more modern machines that are economical and compact, it was noticed that the bulk of early injection molding machines were large. The injector molding machine has the potential for further improvement and local manufacture, according to the study's conclusions.

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13

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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14

Alfian, Alfian. "(MOLDING DESIGN OF PADANG STATE POLYTECHNIC LOGO SOUVENIR MOLDING ON PRESSED PLASTIC INJECTION MOLDING MACHINE 1,960 KG / CM²)." Jurnal Ilmiah Poli Rekayasa 16, no. 2 (May 1, 2021): 93. http://dx.doi.org/10.30630/jipr.16.2.197.

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ABSTRACT Padang State Polytechnic has been established since 1987 under the name Polytechnic Engineering and then changed its name several times to the management policy by Andalas University then, until now it is independent until now with the name Padang State Polytechnic. The 33-year-old polytechnic of the Padang State Polytechnic establishment must have an icon, symbol and trinkets that have PNP characteristics so that they are easy to recognize and remember. Souvenirs are a form of applying media for promotion and souvenirs for people who already know and come to Padang State Polytechnic. Plastic injection molding machine is a machine used to mold plastics with a basic material in the form of plastic pellets. Plastic injection molding machine is the process of processing plastic material in the form of seeds which are heated until they become liquid and then injected into the molding which then freezes / hardens according to the shape of the mold. The products produced by injection molding machines vary, from electronic tools, automotive tools, home appliances, plastic souvenirs, to tableware. The success of the resulting product is highly dependent on Molding. The plastic injection molding machine has parts, namely the Injection Unit, Molding Unit and Clamping Unit. The Injection Unit and Clamping Unit are the most important parts in the manufacturing process of plastic products where the control operation is executed on the control panel found on the plastic injection molding machine. The control panel on the machine can adjust the amount of clamping pressure, stroke length, plastic volume, and temperature used. The molding unit is the main part of the plastic product manufacturing process. Mold (mold) is a tool / tool used to make products according to the desired design (shape and dimensions). Plastic molding has its respective functions, parts of the mold, namely Cavity and Core, Sprue, Runner and Gate, Undercut. The printing process on a Plastic Molding machine has several stages such as the cutting process, mold safety and machine safety, execution, product check, setting, execution, and final. Materials used in the Plastic Molding process are usually materials that are often used daily and are safe for use by all groups, such as Polyproplene, Polycarbonate, and High Density Poly Ethylene. The product that will be produced from the molding made is a key toy souvenir made of plastic, with a shape like the Padang State Polytechnic logo, measuring 6 cm long, 6 cm wide and 5 mm thick. The test results obtained will be shown through field applications, socialization at the Padang State Polytechnic and writing in national journals are the targets and outputs of this novice lecturer research activity. Keywords— Mold, Souvenir, Cavity, Core, Pnp.

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15

Dobránsky, Jozef, Luboš Bĕhálek, and Petr Baron. "Gate Location and its Impact to Flowing Characteristics of Plastic Moldings." Key Engineering Materials 669 (October 2015): 36–43. http://dx.doi.org/10.4028/www.scientific.net/kem.669.36.

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Paper deals with simulation analysis of thermoplastic flowing in plastics product. As there is a demand in plastic products, plastic industries are growing in a fastest rate. Hence plastic injection molding process begins in manufacturing of complex shapes, in this process optimum gate location is one of the important criteria in mold design. Knowledge of ideal flow properties of thermoplastic materials give us a very good starting position for design of thermoplastics products which will be made by injection molding. By simulation software Plastic Advisor was compared injection parameters for the mold with varying gate locations. Simulated thermoplastic product is made from polycarbonate and is using for the drum washing machine as console window.

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16

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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17

Panneerselvam, Vivekanandan, and Faiz Mohd Turan. "Optimization of Process Parameters of Injection Moldings for Plastic Pallets Manufacturing Industry." Journal of Modern Manufacturing Systems and Technology 2 (March 26, 2019): 75–83. http://dx.doi.org/10.15282/jmmst.v2i1.1802.

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Plastics have been heavily used in industries like automobile, manufacturing, electrical and electronics industry all over the world. Injection molding is one of the ways to process plastics polymers. However, one of the difficulties they have to face is to set the optimal parameter for the injection molding process. Incorrect parameter selection can lead to parts defects such as warpage, shrinkage, sink marks, weld marks and so on. In this study, the optimal process parameter of injection molding for manufacturing of plastic pallets which is used for warehousing was determined by the orthogonal array of Taguchi’s L9 which has 3 factors and 3 levels for each factor, experimental design, and Regression Analysis. The three main parameters such as Mold temperature, holding pressure and charging speed were choosen to study their effect on the Compressive strength. S/N ratios were utilized for determining the optimal set of parameters. According to the results, 230 °C of mold temperature, 98 RPM of charging speed, 25 MPa of Holding pressure make the products in the shape and proportion of the product satisfactory. Statically the most significant parameters were found to be as mold temperature and Charging speed for the Polypropylene moldings, respectively. Holding pressure had the least effect on the compressive strength of PP material. After the degree of significance of the studied process parameters was determined, the linear Regression model was generated and was shown to be an effective predictive tool for Compressive strength.

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18

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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19

Haluzíková, B., Jan Valíček, P. Škubala, Marta Harničárová, D. Bražina, V. Szarková, Pavel Koštial, et al. "Identification of Surface Quality of Plastic Electrodes after Blasting." Defect and Diffusion Forum 334-335 (February 2013): 71–76. http://dx.doi.org/10.4028/www.scientific.net/ddf.334-335.71.

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Nowadays, plastics have become one of the most demanded materials, replacing the traditional ones such as metals. Therefore, many companies are concerned with the production of plastics, with their distribution and innovation development. Plastics have found utility in a wide range of applications, we use them every day. Measurement of surface roughness of plastic moldings produced by the injection molding process was carried out by a contact profilometer Mitutoyo Surftest SJ401. A reason for this measurement is to obtain information about surface roughness. For further technical adjustment is required to have higher surface roughness what helps to increase electrical conductivity of plastic moldings. This involves determination of a ratio between Ra/Rz (the ratio between the arithmetic average of the roughness profile Ra and the average maximum height of the profile Rz) in order to satisfy customer demand for achieving better surface characteristics leading to an increase in electrical conductivity.

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20

FUJIYAMA, Mitsuyoshi. "Molecular Orientation Process in Plastics Injection-Molding." Nihon Reoroji Gakkaishi(Journal of the Society of Rheology, Japan) 17, no. 1 (1989): 5–12. http://dx.doi.org/10.1678/rheology1973.17.1_5.

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21

Reboredo, M. M., and A. J. Rojas. "Molding by reactive injection of reinforced plastics." Polymer Engineering and Science 28, no. 7 (April 1988): 485–90. http://dx.doi.org/10.1002/pen.760280712.

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22

Amellal, Karim, Costas Tzoganakis, Alexander Penlidis, and Garry L. Rempel. "Injection molding of medical plastics: A review." Advances in Polymer Technology 13, no. 4 (1994): 315–22. http://dx.doi.org/10.1002/adv.1994.060130407.

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23

Wang, Xin Yu, and Xi Cheng Wang. "Study on Effect of Vibration Parameters in Filling Process of the Dynamic Injection Molding." Applied Mechanics and Materials 55-57 (May 2011): 109–14. http://dx.doi.org/10.4028/www.scientific.net/amm.55-57.109.

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As an application of vibration technique, dynamic molding technology has been applied to the injection molding field due to its effectiveness in practice. In order to simulate this technique in numerical analysis field of the injection molding, a Visual Basic procedure was successfully developed on the basis of the Moldflow Plastics Insight Application Programming Interface. This procedure has been used to simulate filling process of dynamic injection molding of a disk-shaped mould. The results show that dynamic injection molding technology can effectively improve the melt flow characteristics, reducing energy consumption.

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24

Li, Hong Lin, and Zhi Xin Jia. "Study of the Structural Characteristics of Mold for Precise Injection Molding." Advanced Materials Research 291-294 (July 2011): 610–13. http://dx.doi.org/10.4028/www.scientific.net/amr.291-294.610.

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With the improvement of accuracy requirements for industrial products, the precise injection molding is replacing the traditional injection molding quickly and widely. Many factors influence the quality of injection-molded parts greatly, such as the property of the plastics, mold structure and the manufacturing accuracy, injecting machine and the injecting process parameters. In this paper, the work is emphasized for the influence of mold structure on the quality of injection-molded parts. Eight portions of injection mold are analyzed, including the cavities and cores, the guide components, the runner system, the ejection system, the side-core pulling mechanism, the temperature balance system, the venting system and the supporting parts. The structural characteristics of the above eight portions are presented.

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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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Jain, Kalpit, Deepak Kumar, and Sanjay Kumawat. "Plastic Injection Molding with Taguchi Approach - A Review." International Journal of Scientific Research 2, no. 5 (June 1, 2012): 147–49. http://dx.doi.org/10.15373/22778179/may2013/52.

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Moayyedian, Mehdi, Ali Dinc, and Ali Mamedov. "Optimization of Injection-Molding Process for Thin-Walled Polypropylene Part Using Artificial Neural Network and Taguchi Techniques." Polymers 13, no. 23 (November 28, 2021): 4158. http://dx.doi.org/10.3390/polym13234158.

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Plastics are commonly used engineering materials, and the injection-molding process is well known as an efficient and economic manufacturing technique for producing plastic parts with various shapes and complex geometries. However, there are certain manufacturing defects related to the injection-molding process, such as short shot, shrinkage, and warpage. This research aims to find optimum process parameters for high-quality end products with minimum defect possibility. The Artificial Neural Network and Taguchi Techniques are used to find a set of optimal process parameters. The Analytic Hierarchy Process is used to calculate the weight of each defect in the proposed thin-walled part. The Finite Element Analysis (FEA) using SolidWorks plastics is used to simulate the injection-molding process for polypropylene parts and validate the proposed optimal set of process parameters. Results showed the best end-product quality was achieved at a filling time of 1 s, cooling time of 3 s, pressure-holding time of 3 s, and melt temperature of 230 °C. The end-product quality was mostly influenced by filling time, followed by the pressure-holding time. It was found that the margin of error for the proposed optimization methods was 1.5%, resulting from any uncontrollable parameters affecting the injection-molding process.

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Chang, Hanjui, Zhiming Su, Shuzhou Lu, and Guangyi Zhang. "Intelligent Predicting of Product Quality of Injection Molding Recycled Materials Based on Tie-Bar Elongation." Polymers 14, no. 4 (February 10, 2022): 679. http://dx.doi.org/10.3390/polym14040679.

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In the process of injection molding, a certain percentage of recycled material is usually used in order to save costs. The material properties of recycled materials can change significantly compared with raw materials, and the quality of their molded products is more difficult to control. Therefore, it is crucial to propose a method that can effectively maintain the yield of the recycled material products. In addition, the variation of clamping force during the injection molding process can be determined by measuring the tie-bar elongation of the injection molding machine. Therefore, this study proposes a real-time product quality monitoring system based on the variation of clamping force during the injection molding process for the injection molding of recycled materials for plastic bottle caps. The variation of clamping force reflects the variation of cavity pressure during the injection molding process and further maps the variation of injection parameters during the injection molding process. Therefore, this study evaluates the reliability of the proposed method for three different injection parameters (residual position, metering end point and metering time). Experiments have shown that there is a strong correlation between the quality (geometric properties) and weight of the product under different molding parameters. Moreover, the three main injection parameters have a strong influence on the weight and quality of the plastic caps. The variation of the clamping force is also highly correlated with the weight of the plastic bottle cap. This demonstrates the feasibility of applying the variation of clamping force to monitor the quality of injection molded products. Furthermore, by integrating the clamping force variation index with the calibration model of the corresponding injection parameters, it is possible to control the weight of the plastic cap within the acceptable range of the product in successive production runs.

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Hemminger, Thomas L., and Robert E. Farrell. "High Resolution Measurement of Translucent Plastic Wall Thicknesses by Computerized Tomography and Neural Networks." International Journal of Neural Systems 08, no. 03 (June 1997): 317–24. http://dx.doi.org/10.1142/s012906579700032x.

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Today there is a great deal of interest in the field of plastics design. Several methods can be employed to create plastic products such as injection molding, compression and transfer molding, and blow molding. This paper is concerned with blow molding which is a procedure employed to create hollow plastic containers such as those used to contain liquids and solids in the wholesale and retail markets. An important aspect of blow molding is the measurement of the wall thickness of semi-liquid plastic before the molding procedure has been initiated. Minimization of waste is rapidly becoming a critical consideration within the plastics community due to the cost of raw polymers. Unfortunately, it is also an extremely difficult task to measure the thickness considering the high temperatures and elasticity of the polymers in question. This paper presents initial research on a non-invasive approach for wall thickness measurements of semi-liquid plastics through the utilization of computerized tomography and neural networks. The work described here is based on simulations and on modeling data obtained through experimental means. This technique can be extended to other fields of research as well, such as those related to the development of glass and ceramic products.

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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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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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Su, Te Li, Fu Chen Kung, and Yu Lin Kuo. "Optimization of High Performance Engineering Plastics in Thin Wall Part Injection Molding." Advanced Materials Research 213 (February 2011): 58–62. http://dx.doi.org/10.4028/www.scientific.net/amr.213.58.

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The purpose of this study is to improve the qualities of thin wall part injection molding using polypropylene. The shape of injection molding products is getting more and more complex now, and the requirement for accuracy is also getting higher. The traditional trial and error method and rules of experience cannot be used well at all. This study applied Taguchi method and grey relational analysis to optimize the injection molding process for obtaining multiple quality characteristics of thin wall parts. The experimental results verify the reliability of optimum conditions via confirmation experiment.

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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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Zhao, Zhen Yu, Long Liao, Fei Tang, and Bai Liu. "Moldflow Software in a Complex Plastic Shell Injection Mold Design." Applied Mechanics and Materials 29-32 (August 2010): 646–50. http://dx.doi.org/10.4028/www.scientific.net/amm.29-32.646.

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The paper describes the important role of Moldflow technology and status. Through the application of Moldflow / MPI (Moldflow Plastics Insight) software for CAE under a comprehensive analysis of the shell molds, injection molding parameters such as mold temperature, melt temperature, injection time and injection pressure are used to simulate the actual production process. This shows the Moldflow technology plays a significant role in the mold development process for optimizing plastic products design, plastic mold design and injection process parameters, etc.

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Li, Ji Bin, Ke Ke Xu, Xin Bo Lin, Xiao Yu Wu, and Guo Li Gao. "Research on the Flow Characteristics of Polymer Injection Molding under Ultrasonic Vibration and Plastics’ Mechanical Strength." Applied Mechanics and Materials 37-38 (November 2010): 1092–100. http://dx.doi.org/10.4028/www.scientific.net/amm.37-38.1092.

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In this paper, ultrasonic vibration is adopted and exerted on injection molding in order to improve plastics’ forming ability, and the impact testing is used to analyze different injection parts’ mechanical properties. On the one hand, experiments prove that ultrasonic vibration can increase polymer’s melt flow rate, decrease melt viscosity, and improve injection flowing in mould cavity. On the other hand, the mechanical tests prove that the ultrasonic vibration can improve plastics’ tensile strength, elastic modulus and other mechanical properties. As a result, a weldless ultrasound-assisted injection molding method is recommended.

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Hrițuc, Adelina, Margareta Coteață, Oana Dodun, Gheorghe Nagîț, and Laurențiu Slătineanu. "Optimal Selection of Equipment for Injection Molding Process using the AHP Method." MATEC Web of Conferences 290 (2019): 03005. http://dx.doi.org/10.1051/matecconf/201929003005.

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Increased interest in the study of plastics has led to the development of processing technologies using such materials. The variety of plastics has led to a diversification of the technical processes through which the finished plastic products can be obtained. We approached the idea of designing plastic injection equipment, considering that various research could be made on the phenomena involved during the process, as well as the observation of the technological properties of the plastics. To design such equipment, some known methods used in conception processes could be applied. Optimizing the equipment design process is one of the elements that can ensure high efficiency of the entire injection molding process. Thus, the method chosen in this case was the analytic hierarchy process (AHP) method, which is one of the methods that offer the possibility to choose a solution when there are many alternatives. The relative simplicity and precision of this method are some of the arguments behind this method. The combination of required equipment and application of the AHP method allowed the choice of an optimal solution for testing injection molding. The result of design activity was an alternative to equipment that can be used for developing future research.

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Kairulazam, Che Ku Abdullah Che Ku, M. I. Hussain, Zuraidah Mohd Zain, and Nabilah A. Lutpi. "Reduction of Rejection Rate for High Gloss Plastics Product Using Six Sigma Method." Applied Mechanics and Materials 606 (August 2014): 141–45. http://dx.doi.org/10.4028/www.scientific.net/amm.606.141.

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High gloss plastics part in injection molding industries were widely used in Malaysia. However the high rejection rate in this industries were major problem affecting the economic aspects. Therefore this paper presents an approach of implementing six sigma method to reduce the rejection rate in a plastic injection molding process for high gloss plastics part. Define, Measure, Analyze Improve and Control (DMAIC) methodology was applied as basis of the study. By using current process, the average of rejection is 40.6% and the aim of this study is to reduce the rejection rate to less than 10 % . All potential factors were taken into account to identify the significant factors. The improvement process was made base on the analysis output. This study was successful with increment in sigma level from 1.74 σ to 3.00 σ. .

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Formas, Krzysztof, Anna Kurowska, Jarosław Janusz, Piotr Szczygieł, and Izabella Rajzer. "Injection Molding Process Simulation of Polycaprolactone Sticks for Further 3D Printing of Medical Implants." Materials 15, no. 20 (October 18, 2022): 7295. http://dx.doi.org/10.3390/ma15207295.

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The aim of the present study was a simulation of the injection molding process of polycaprolactone filament sticks for further 3D printing of osteochondral implants. Polycaprolactone data are not available in the data banks of popular injection molding simulation programs. Therefore, thermal and rheological data from the literature were imported to the material database of Solidworks Plastics software to simulate the injection molding process of filament sticks. The influence of several injection molding parameters including melt temperature, injection time, and injection pressure on the geometry of filament stick (final part) was investigated. Based on the results of the performed simulation and analyses, it was possible to improve the injection process parameters. The accuracy of simulation predictions, based on the literature data, demonstrates the potential of using simulation as a tool to develop polycaprolactone parts for future implants and to optimize the injection molding process.

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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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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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41

Lam, Y. C., and L. W. Seow. "Cavity balance for plastic injection molding." Polymer Engineering & Science 40, no. 6 (June 2000): 1273–80. http://dx.doi.org/10.1002/pen.11255.

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42

Takayama, Terufumi, Kentaro Komabayasi, Masafumi Itou, and Yuichi Miyake. "Development of Bio-Based Plastics for Injection Molding." SAE International Journal of Materials and Manufacturing 2, no. 1 (April 20, 2009): 12–17. http://dx.doi.org/10.4271/2009-01-0019.

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Rosen, Mark, and Arash Kiani. "The Role of Plastics Compounding for Injection Molding." Plastics Engineering 72, no. 1 (January 2016): 24–28. http://dx.doi.org/10.1002/j.1941-9635.2016.tb01455.x.

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Bai, Yu, Bo Yin, Xia-rong Fu, and Min-gbo Yang. "Heat transfer in injection molding of crystalline plastics." Journal of Applied Polymer Science 102, no. 3 (2006): 2249–53. http://dx.doi.org/10.1002/app.24398.

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Chaciński, Tomasz, and Paweł Sutowski. "Common defects in injection molding of plastic products and their influence on product quality." Journal of Mechanical and Energy Engineering 5, no. 1 (August 12, 2021): 7–14. http://dx.doi.org/10.30464/10.30464/jmee.2021.5.1.7.

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The article deals with issues related to quality management and quality assessment in production of plastic articles in injection moulding. Expert knowledge collected in textbooks and literature allows to get acquainted with the characteristics of plastic article production and product quality defects arising in such processes. The characteristics and technology of plastics processing are discussed, the most frequent quality defects occurring in the production of articles made of plastics by injection molding are listed. On the basis of expert knowledge collected in the literature, a series of actions leading to the elimination of each of the mentioned quality defects has also been proposed.

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46

Kuo, Chil-Chyuan, and Xin-Yu Pan. "Development of a Rapid Tool for Metal Injection Molding Using Aluminum-Filled Epoxy Resins." Polymers 15, no. 17 (August 23, 2023): 3513. http://dx.doi.org/10.3390/polym15173513.

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Metal injection molding (MIM) is a near net-shape manufacturing process combining conventional plastic injection molding and powder metallurgy. Two kinds of injections molds for MIM were developed using conventional mold steel and aluminum (Al)-filled epoxy resins in this study. The characteristics of the mold made by rapid tooling technology (RTT) were evaluated and compared with that of the fabricated conventional machining method through the MIM process. It was found that the service life of the injection mold fabricated by Al-filled epoxy resin is about 1300 molding cycles with the average surface roughness of 158 nm. The mold service life of the injection mold fabricated by Al-filled epoxy resin is about 1.3% that of the conventional mold steel. The reduction in manufacturing cost of an injection mold made by Al-filled epoxy resin is about 30.4% compared with that of the fabricated conventional mold steel. The saving in manufacturing time of an injection mold made by RTT is about 30.3% compared with that of the fabricated conventional machining method.

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47

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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48

Middleton, B., and V. Goodship. "Injection molding electroluminescent components." Polymer Engineering & Science 53, no. 7 (December 22, 2012): 1554–62. http://dx.doi.org/10.1002/pen.23399.

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Liu, Y., L. Cao, W. K. Chi, L. Y. Zhang, W. M. Yang, and P. C. Xie. "Multi-Layer Counter-Pressure Injection Molding for Thick-Walled Optical Lens." International Polymer Processing 36, no. 2 (May 1, 2021): 131–36. http://dx.doi.org/10.1515/ipp-2020-3994.

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Abstract In precision optical applications, plastics thick-walled optical lenses are increasing. Dimensional stability and optical performance are the critical issues that should be addressed for plastic thick-walled lenses. A novel multi-layer counter-pressure injection molding process is proposed in this study. The experimental prism mold with moveable pistons was developed to investigate the effects of layering methods, counter-pressure and their combination on thick-walled optical lenses. The experimental results reveal that counter-pressure injection molding is effective in improving shrinkage, transmittance and refractive index of the thick-walled optical prism. Counter-pressure of the piston provided lower melt velocity and shorter flow path of melt to improve polymer molecules orientation, and also offered continuous holding pressure during the filling stage to eliminate defects such as shrinkage or short shots. The combination of counter-pressure and multi-layer injection molding technology further improved the dimension stability and optical performance of the thick-walled optical lens. Much thinner layers than the final wall thickness of prism ensures shrinkage reduction during the cooling stages. A thick-walled optical prism was fabricated successfully upon applying a multi-layer counter-pressure injection molding process.

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Huang, Yueh-Tzu, Chiung-Fang Huang, Bou-Yue Peng, Chun-Wei Chang, Hsing-Chung Cheng, Yi Lin, Yung-Kang Shen, and Hao Wang. "Experimental and Numerical Study Determining the Warpage Phenomenon of Thin-Wall Injection Molding." Advances in Polymer Technology 2020 (October 26, 2020): 1–13. http://dx.doi.org/10.1155/2020/2914801.

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This study emphasizes the warpage phenomenon of thin-walled parts using acrylonitrile-butadiene styrene (ABS) plus polycarbonate (PC) plastics for optimal processing by thin-wall injection molding. The authors first employed the Moldflow software to analyze the runner’s balance on multicavities for thin-walled parts and to simulate the warpage of thin-walled parts with thin-wall injection molding. Then, this study used those data to fabricate a real mold by computer numerical control machining. For this study, the authors fabricated thin-walled parts and measured their warpage using various process parameters (injection speed, injection pressure, mold temperature, packing time, and melt temperature) with thin-walled injection molding. Finally, the authors found that the most important processing parameter was the packing time for warpage phenomenon of thin-walled parts by thin-wall injection molding.

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