Article
Engineering, Chemical
Ferenc Szabo, Andras Suplicz, Jozsef Gabor Kovacs
Summary: The quality of injection molded products depends on various factors and computer modeling is used to address these complexities, although challenges remain in simulating the effects of fillers on the polymer properties.
Review
Polymer Science
Krzysztof Wilczynski, Krzysztof J. Wilczynski, Kamila Buziak
Summary: Injection molding is one of the most important technologies in the polymer processing industry. This paper presents and discusses the latest advancements in modeling and experimentation of polymer flow and melting in injection molding machines. It also uncovers the phenomenon of starvation in the beginning sections of the screw, which has not been reported in the literature.
Article
Engineering, Chemical
Demitri Shotwell, Jinsu Gim, Huaguang Yang, Stefanie Glas, Edward Chen, Lih-Sheng Turng
Summary: The effect of an in-mold static mixer on the optical properties of polystyrene parts in the injection molding process was studied. Experimental and simulation results showed a certain correlation, but there were also some differences that could be attributed to measurement accuracy or unaccounted-for variables. The use of a static mixer can homogenize the polymer melt in the injection process, but it may also have a negative impact on the optical performance due to increased melt flow and residual stresses.
POLYMER ENGINEERING AND SCIENCE
(2022)
Article
Engineering, Biomedical
Stephanie L. McNamara, Ethan M. McCarthy, Daniel F. Schmidt, Stephen P. Johnston, David L. Kaplan
Summary: Traditional bone fixation devices made from inert metal alloys provide structural strength for bone repair but are limited in their ability to actively promote bone healing. However, injection and compression molding techniques have successfully been used to manufacture composite silk-ceramic scaffolds comprising hydroxyapatite and silk fibroin, showing the potential for large-scale manufacturing of natural protein-based bone grafts and fixation devices. This work demonstrates a step closer towards moving bone tissue engineering to large-scale manufacturing of resorbable bone grafts and fixation devices based on natural proteins.
Article
Materials Science, Composites
Ruoxiang Gao, Hao Chen, Zhezai Hu, Xuewen Cheng, Shiquan Gao, Shaohua Zhou, Peng Zhao
Summary: This study presents a novel method for predicting product strength by analyzing weld line and fiber orientation in injection molding, and successfully applies it to the gate design of an aerospace product. The results indicate that this method has great potential for mold design, product structure design, and process optimization.
POLYMER COMPOSITES
(2022)
Article
Materials Science, Multidisciplinary
Leire Etxeberria, Jon Haitz Badiola, Malen Astigarraga, Felipe Garitaonandia, Ane Miren Zaldua
Summary: Point-of-care and organ-on-chip devices are promising microfluidic applications for in vitro analysis and miniaturized studies, reducing reliance on animal testing. This study compares injection molding and injection-compression molding techniques for mass manufacturing of thermoplastic microfluidic devices, highlighting the potential of both techniques for producing these devices at a large scale and low cost.
MACROMOLECULAR MATERIALS AND ENGINEERING
(2023)
Review
Polymer Science
Lin Deng, Suo Fan, Yun Zhang, Zhigao Huang, Huamin Zhou, Shaofei Jiang, Jiquan Li
Summary: This paper reviews the state-of-the-art progress in the multiscale modeling and simulation of injection molding of polymer blends, discussing technological development on a macroscale and various models for morphology evolution on a mesoscale. Strategies for scale-bridging between mold-filling flow and morphology evolution are analyzed and compared, presenting a comprehensive summary and outlook for future research in this field.
Article
Polymer Science
Chun-Der Cheng, Yi-Ling Liao, Hsi-Hsun Tsai
Summary: The injection compression molding process for producing a half-pallet faces many challenges, and butt-welding one pallet to another enhances its strength. Using the advanced Moldex3D package helps analyze the temperature distribution and warpage of the half-pallet. Adjusting the cooling water temperature of the mold reduces the warpage of the half-pallet.
Article
Materials Science, Ceramics
Rezvan Yavari, Hamid Khorsand
Summary: This study investigated the injection process of SiC feedstock at various temperatures and flow rates using powder injection molding technique. The results showed that effective separation of powder and binder could be achieved through simulation and experimental validation, providing a new approach for manufacturing complex ceramic components.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Polymer Science
Wei-Chun Lin, Fang-Yu Fan, Chiung-Fang Huang, Yung-Kang Shen, Hao Wang
Summary: In this study, the effects of design and processing parameters of precision injection molding (PIM) on minimizing warpage of micro-sized parts were determined. The mold temperature was found to be the most significant process parameter, and PA material was identified as the most suitable for micro-sized parts.
Article
Engineering, Chemical
Fabian Ullrich, Shailendra Pal Veer Singh, Sean McDonald, Alex Krueger, Javier Vera-Sorroche, Alireza Amirkhizi, Davide Masato
Summary: The study investigates the impact of processing-induced thermal history on the mechanical behavior of polycarbonate samples. The research shows that thermal history significantly affects the material at low strain rates, but becomes negligible in the dynamic range. The modeling approach allows for accurate estimation of yield strength depending on the strain rate values.
POLYMER ENGINEERING AND SCIENCE
(2022)
Article
Engineering, Chemical
Ting-Yu Cheng, Kun-Cheng Ke, Sen-Yeu Yang
Summary: In this study, a wafer-level, double-sided microlens array was designed and manufactured using injection compression molding (ICM). Simulation and experimental results showed that the ICM-molded MLA had higher precision and lower residual stress compared to the injection molding (IM)-molded MLA.
POLYMER ENGINEERING AND SCIENCE
(2023)
Article
Materials Science, Composites
Chenglin Li, Qingyuan Du, Yue Ru, Hao Zhang, Yi An, Jiaming Liu, Daming Wu, Dali Gao, Jingyao Sun
Summary: With the increasing power consumption of electronic devices, the challenge of heat dissipation has become a major issue. This study focuses on the preparation of polypropylene/carbon fiber/Al2O3, polypropylene/carbon fiber, and polypropylene/carbon fiber/SiO2 composites with excellent properties using injection molding and injection compression methods. The results show that the composites prepared by injection compression have better thermal conductivity and mechanical properties compared to those prepared by injection molding.
COMPOSITES COMMUNICATIONS
(2022)
Article
Engineering, Chemical
Toshiki Sasayama, Hirotaka Okamoto, Norikazu Sato, Jumpei Kawada
Summary: This study developed a method for predicting the orientation of plate-like particles in injection-molded products with low filler content. The simulation results were validated through experiments, and the potential application of the simulation in the manufacturing of metallic-looking products was demonstrated.
Article
Agronomy
Jingjing Fu, Zhichao Cui, Yongsheng Chen, Chunsong Guan, Mingjiang Chen, Biao Ma
Summary: In this study, the compression molding behavior of substrate blocks was evaluated using a combination of physical experiments and DEM simulation. A calibration procedure for the DEM parameters of peat particles was proposed, and the effect of loading speed on compression behavior was investigated. The study found that the number of particles in the central sections was higher and the coefficient of variation was greater at higher loading speeds. The findings of this study can serve as a reference for the design of substrate block forming machines.
