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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]
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
ThermographieIndex. 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 PPSDOI : 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 : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39193
in INTERNATIONAL POLYMER PROCESSING > Vol. 38, N° 1 (2023) . - p. 42-53[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 24052 - Périodique Bibliothèque principale Documentaires Disponible A warpage optimization method for injection molding using artificial neural network combined weighted expected improvement / H. Shi in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 3 (07/2012)
[article]
Titre : A warpage optimization method for injection molding using artificial neural network combined weighted expected improvement Type de document : texte imprimé Auteurs : H. Shi, Auteur ; X. Wang, Auteur ; S. Xie, Auteur Année de publication : 2012 Article en page(s) : p. 341-347 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Gauchissement (matériaux)
Matières plastiques -- Moulage par injection
Polyéthylène basse densité
Polyéthylène basse densité linéaire
Réseaux neuronaux (informatique)Index. décimale : 668.4 Plastiques, vinyles Résumé : A surrogate-based warpage optimization for injection molding is proposed in this study. The optimization process aims at minimizing the warpage of the injection molding parts in which process parameters, i. e., the mold temperature, melt temperature, injection time, packing time, packing pressure, and cooling time are the design variables. The warpage values are reduced by optimizing the process parameters. A new optimization iteration scheme based on artificial neural network (ANN) combined weighted expected improvement (WEI) is employed to speed up the optimization process and to ensure very rapid and steady convergence. The ANN is used to build an surrogate warpage function for the process parameters, replacing the expensive simulation analysis in the optimization iterations. The adaptive process is executed by the WEI function, which is an infilling sampling criterion. Although the design of experiment (DOE) size is small, this criterion can precisely balance the local and global search and tend to find the global optimal design. As examples, a TV cover and a scanner are investigated. The results show that the proposed approach can effectively reduce the warpage of the injection molding parts. DOI : 10.3139/217.2542 En ligne : https://drive.google.com/file/d/1dI2t1FKionveyHM1TOoSX9Te6nERU0pk/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15580
in INTERNATIONAL POLYMER PROCESSING > Vol. XXVII, N° 3 (07/2012) . - p. 341-347[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 13995 - Périodique Bibliothèque principale Documentaires Disponible Water assisted injection molding : A review / S.-J. Liu in INTERNATIONAL POLYMER PROCESSING, Vol. XXIV, N° 4 (09/2009)
[article]
Titre : Water assisted injection molding : A review Type de document : texte imprimé Auteurs : S.-J. Liu, Auteur Année de publication : 2009 Article en page(s) : p. 315-325 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Matières plastiques -- Moulage par injection Index. décimale : 668.9 Polymères Résumé : Water assisted injection molding technology has become one of the most important methods to manufacture hollow plastic parts in recent years, due to its light weight, relatively lower resin cost per part and faster cycle time. This report aims to present a review of the development and progress of the water assisted injection molding technology. The tooling used for the process is introduced. The interaction between the assisting water and the polymer melt during molding is discussed, and insight into the penetration behaviors of the fluid is summarized. In addition, comparisons have been made between the gas-assisted injection molding and water assisted injection molding processes. DOI : 10.3139/217.2255 En ligne : https://drive.google.com/file/d/1Xccko1W-YbtdHAskJiaDr49uRaVyuqVe/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6076
in INTERNATIONAL POLYMER PROCESSING > Vol. XXIV, N° 4 (09/2009) . - p. 315-325[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 011516 - Périodique Bibliothèque principale Documentaires Disponible Water penetration behavior in water-assisted injection molding (WAIM) : A study of product quality for different process and material parameters / Sofie Sannen in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 5 (11/2012)
[article]
Titre : Water penetration behavior in water-assisted injection molding (WAIM) : A study of product quality for different process and material parameters Type de document : texte imprimé Auteurs : Sofie Sannen, Auteur ; M. de Munck, Auteur ; Peter Van Puyvelde, Auteur ; J. de Keyzer, Auteur Année de publication : 2012 Article en page(s) : p. 602-616 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Matières plastiques -- Moulage par injection
Matières plastiques -- Moulage par injection assistée par eau
Moulage par injection -- Défauts
PolypropylèneTags : 'Moulage injection assisté eau' Polypropylène 'Comportement pénétration 'Epaisseur paroi résiduelle' 'Formation défaut pièce' 'Mesure pression 'Débit volume' Viscosité 'Fluidité cisaillement' Index. décimale : 668.4 Plastiques, vinyles Résumé : This study investigates the relation between water penetration behavior and product quality in water-assisted injection molding (WAIM) for different process and material parameters. The principle mechanisms responsible for both building up the residual wall thickness (RWT) and formation of part defects as well as the influence of these process and material parameters on the RWT and occurrence of part defects could be revealed. This is done by relating the measurements of water pressure and water volume flow rate, visualizing in-mold variations during water injection, to both the part weight and a visual inspection of part cross-sections, for different process settings and materials. It was found that the RWT as well as the formation of part defects depend on the polymer resistance, since the variation of the latter leads to a change in both the water bubble width and velocity. On the one hand, the resistance is determined by the process parameters having an influence on the amount of melt ahead of the water bubble, depending on injector opening time, water volume flow rate and water injection delay time. On the other hand, the resistance also depends on the friction between the polymer chains, which is determined by the zero-shear viscosity and the shear thinning behavior of the polymer. In addition, the occurrence of part defects is directly related to the polymer crystallization behavior. The resulting product quality therefore depends on a combination of the process parameters and the applied material. Note de contenu : - EXPERIMENTAL : Material ans set-up - Methodology
- RESULTS AND DISCUSSION : Injector opening time - Influence of material parametersDOI : 10.3139/217.2622 En ligne : https://drive.google.com/file/d/1QMi2LZqb5pZ-u5u4ggioD88OQUFJCeov/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16643
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Code-barres Cote Support Localisation Section Disponibilité 14335 - Périodique Bibliothèque principale Documentaires Disponible Wear protection for ring non-return valves / Christian Gornik in KUNSTSTOFFE INTERNATIONAL, Vol. 98, N° 9/2008 (09/2008)
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Titre : Wear protection for ring non-return valves Type de document : texte imprimé Auteurs : Christian Gornik, Auteur Année de publication : 2008 Article en page(s) : p. 60-63 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Matériaux céramiques
Matières plastiques -- Moulage par injection
PlastificationIndex. décimale : 668.4 Plastiques, vinyles Résumé : Plastication - Ring non-return valves show particularly high adhesive wear at high rotational velocities. This phenomenon can be counteracted by making the sliding surfaces from ceramic or adapting the geometry. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3761
in KUNSTSTOFFE INTERNATIONAL > Vol. 98, N° 9/2008 (09/2008) . - p. 60-63[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 010699 - Périodique Bibliothèque principale Documentaires Disponible Weighing without time overhead / Deborah Lidauer in KUNSTSTOFFE INTERNATIONAL, Vol. 109, N° 10 (10/2019)
PermalinkWell-balanced hot runner technology for LCP processing / Horst-Werner Bremmer in KUNSTSTOFFE INTERNATIONAL, Vol. 111, N° 5 (2021)
PermalinkWell protected against electromagnetic interference / Marnik Vaes in KUNSTSTOFFE INTERNATIONAL, Vol. 111, N° 1 (2021)
PermalinkWhat is the most suitable material combination / Christian Hopmann in KUNSTSTOFFE INTERNATIONAL, Vol. 112, N° 2 (2022)
PermalinkWhen validated quality is not a competitive advantage / Vaculik, Robert in PLASTICS INSIGHTS, Vol. 113, N° 6 (2023)
PermalinkPermalinkWhy must the process control make corrections on restart ? / Stefan Kruppa in KUNSTSTOFFE INTERNATIONAL, Vol. 107, N° 9 (09/2017)
PermalinkPermalinkWireless life cycle monitoring in the injection molded part / Matthias Zeppenfeld in KUNSTSTOFFE INTERNATIONAL, Vol. 109, N° 4 (04/2019)
PermalinkWith broad sword and data collector / Peter Peschl in KUNSTSTOFFE INTERNATIONAL, Vol. 111, N° 4 (2021)
PermalinkWith a system change to new competitiveness / Reinhard Bauer in KUNSTSTOFFE INTERNATIONAL, Vol. 112, N° 1 (2022)
Permalink"With system integration, fewer errors occur" / Fabian Diehr in KUNSTSTOFFE INTERNATIONAL, Vol. 108, N° 11 (11/2018)
PermalinkWPC has different filling behavior / Cathrin Funke in KUNSTSTOFFE INTERNATIONAL, Vol. 100, N° 8 (08/2010)
Permalink"You can see what is happening in the mold" / Eberhard Duffner in KUNSTSTOFFE INTERNATIONAL, Vol. 110, N° 6 (2020)
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