Evaluation of thermal contact resistance of molten resin–mold interface during high-thermal-conductivity polyphenylene sulfide filling in injection molding / Akifumi Kurita in INTERNATIONAL POLYMER PROCESSING, Vol. 39, N° 2 (2024)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. 39, N° 2 (2024) . - p. 242-259 Titre : Evaluation of thermal contact resistance of molten resin–mold interface during high-thermal-conductivity polyphenylene sulfide filling in injection molding Type de document : texte imprimé Auteurs : Akifumi Kurita, Auteur ; Yohei Yoshimura, Auteur ; Makoto Suzuki, Auteur ; Hidetoshi Yokoi, Auteur ; Yusuke Kajihara, Auteur Année de publication : 2024 Article en page(s) : p. 242-259 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Interfaces (Sciences physiques) Interfaces solide-liquide Matières plastiques -- Moulage par injection Polysulfures de phénylène Thermocinétique Index. décimale : 668.4 Plastiques, vinyles Résumé : High-thermal-conductivity polyphenylene sulfide (PPS) has both mechanical and heat dissipation properties, and its low weight and fuel efficiency make it a suitable replacement for metals in automobiles. However, this resin often causes filling defects in the injection molding process. This is due to the higher thermal conductivity, which causes the molten resin to solidify more quickly during the filling process. Therefore, it is important to predict the cooling and filling behaviors of the resin accurately using computer-aided engineering (CAE). Currently, many commercial software programs use thermal contact resistance (TCR) as the thermal boundary condition between the mold and resin. However, there is no established method to accurately evaluate TCR during filling with high spatial resolution and response, and the accuracy of CAE cannot be maintained. Therefore, we used thermography and a prismatic glass insert mold to thermally visualize and analyze the filling process of this resin. Consequently, we succeeded in evaluating TCR values with high spatial resolution and response. The obtained TCR values varied depending on the flow state and pressure. To further validate the obtained TCR values, we compared “the visualization results of real flow conditions” and “the flow prediction results of CAE considering the obtained TCR values”. Note de contenu : - MATHEMATICAL MODEL OF HEAT TRANSFER AND TCR EVALUATION METHOD - EXPERIMENTAL METHOD : Experimental method - In-process temperature distribution visualization system - Cavity shape, material, and molding conditions in TCR measurement experiments - Simulation of TCR measurements - EXPERIMENTAL RESULTS AND DISCUSSION OF TCR MEASUREMENT : Simulation results of TCR measurements - Visualization analysis of temperature distribution and evaluation results of TCR - VISUALIZATION ANALYSISI AND CAE OF FILLING BEHABIOR : Cavity shape, material, and molding conditions for partial thin-walled filling behavior tests - Results and discussion of visualization analysis of filling behavior of high-thermal-conductivity PPS - Results and discussion of CAE prediction of filling behaviour - SUMMARY AND FUTURE SCOPE - APPENDIX A : PHYSICAL PROPERTIES OF RESINS USED IN CAE DOI : https://doi.org/10.1515/ipp-2023-4448 En ligne : https://drive.google.com/file/d/152EnzAiJiBqS1C4mB_b7zhUBwk61AQrD/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40867 [article]

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Visualization analysis of temperature distribution in the cavity of conventional PPS and high-thermal-conductivity PPS during the filling stage of injection molding / Akifumi Kurita in INTERNATIONAL POLYMER PROCESSING, Vol. 38, N° 1 (2023)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. 38, N° 1 (2023) . - p. 42-53 Titre : Visualization analysis of temperature distribution in the cavity of conventional PPS and high-thermal-conductivity PPS during the filling stage of injection molding Type de document : texte imprimé Auteurs : Akifumi Kurita, Auteur ; Yohei Yoshimura, Auteur ; Makoto Suzuki, Auteur ; Hidetoshi Yokoi, Auteur ; Yusuke Kajihara, Auteur Année de publication : 2023 Article en page(s) : p. 42-53 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Matières plastiques -- Moulage par injection Polysulfures de phénylène Rayonnement infrarouge Thermocinétique Thermographie Index. décimale : 668.4 Plastiques, vinyles Résumé : As a highly thermally conductive PPS that is lightweight and has excellent heat dissipation is expected to be applied in various products, its peculiar filling behavior can cause molding defects such as short shots and surface cracks. To address these challenges, it is important to elucidate the filling behavior and clarify the effects of cavity shape and molding conditions. Thus, we intend to visualize the filling behavior of the high-thermal-conductivity PPS. To achieve this goal, we develop an in-process visualization system to reveal both the thermal and kinetic behaviors of the resin while it fills the cavity. In the system, a sapphire prism glass is utilized in the mold for visualization because it exhibits high strength, high heat conduction, and high infrared transmittance. A high-speed visible camera for kinetic behavior and an infrared camera for thermal behavior are utilized. With the developed system, we successfully obtained for the first time the filling behavior of high-thermal-conductivity PPS. Visualization experiments prove that the temperature of the conventional PPS gradually decreases from the tip to the rear of the flow. However, the temperature of the high-thermal-conductivity PPS drops sharply from the tip of the flow to the rear, and breakage at the flow front near the cavity wall is generated. Our interpretation is that the flow front near the cavity wall can be easily broken when it is stretched, because the ductility of the high-thermal-conductivity PPS largely decreases because of the rapid temperature drop. To suppress the formation of this breakage, we modify the cavity shape and molding conditions, and verify its suppression effect. Note de contenu : - EXPERIMENTAL : In-process visualization system - Material, cavity shape and molding conditions - RESULTS AND DISCUSSION : Visualization of conventional PPS - Visualization of high-thermal-conductivity PPS - Discussion of the unstable flow mechanism of high-thermal-conductivity PPS DOI : https://doi.org/10.1515/ipp-2022-4225 En ligne : https://drive.google.com/file/d/1ut9VU4Gf0QSTzndF-ZuqPXhKz__gq5zw/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39193 [article]

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