Development of a hybrid solid-microcellular co-injection molding process / Lih-Sheng Turng in INTERNATIONAL POLYMER PROCESSING, Vol. XIX, N° 1 (03/2004)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XIX, N° 1 (03/2004) . - p. 77-86 Titre : Development of a hybrid solid-microcellular co-injection molding process Type de document : texte imprimé Auteurs : Lih-Sheng Turng, Auteur ; H. Kharbas, Auteur Année de publication : 2004 Article en page(s) : p. 77-86 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : This paper presents the development of a hybrid solid-micro-cellular co-injection molding process that combines aesthetic and processing advantages of injection molding with benefits and property attributes of microcellular plastics (MCPs). A two-color injection molding machine has been modified and equipped with an interfacial platen and a supercritical fluid (SCF) unit for co-injection molding with regular resins and MCPs. Co-injection molded polystyrene (PS) parts with a microcellular core encapsulated by the solid skin layer have been successfully produced. Systematic experiments were carried out with solid-microcellular co-injection molding, conventional solid-solid co-injection molding, and regular microcellular injection molding processes to study the effects of process conditions and core/skin volume ratios on the penetration and morphology of the microcellular core. Light microscopy and scanning electron microscopy (SEM) of the solid-microcellular co-injection molded specimens reveal a microcellular core with fairly fine and uniform cell size of 8 to 12 microns and a cell density of up to 3x108cells/cm3. Under similar process conditions, microcellular cores were found to penetrate longer and generate a more uniform and thicker skin layer than do solid cores. While improving the surface finish with solid skin layers, this process is capable of producing parts with reduced sink marks, lighter part weights, and shorter cycle times. DOI : 10.3139/217.1806 En ligne : https://drive.google.com/file/d/1iPME4xSRxVs08fonLxfqi1ObduuE761u/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3299 [article]

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Microcellular injection molding / S. Gong in INTERNATIONAL POLYMER PROCESSING, Vol. XX, N° 2 (06/2005)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XX, N° 2 (06/2005) . - p. 202-214 Titre : Microcellular injection molding Type de document : texte imprimé Auteurs : S. Gong, Auteur ; Lih-Sheng Turng, Auteur ; A. Osorio, Auteur ; H. Kharbas, Auteur ; A. Chandra, Auteur ; M. Yuan, Auteur Année de publication : 2005 Article en page(s) : p. 202-214 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : This paper reviews some of the recent developments of microcellular injection molding, which is capable of producing parts with excellent dimensional stability using lower injection pressure, shorter cycle time, and less material. Process conditions as well as nano/micro-fillers such as nanoclay and core–shell rubber have a strong influence on cell density and cell size, hence, the final material properties of the molded parts. The addition of nano/micro-fillers at optimum loading levels can generally facilitate the formation of microcellular plastics with higher cell density and smaller cell size leading to superior mechanical properties. The novel integration of a solid plastic surface with a microcellular plastic core via the co-injection molding technique has been investigated to achieve Class “A” surfaces and improved material performance. An improved mathematical model has been developed to simulate the cell growth behavior in the microcellular injection molding process. DOI : 10.3139/217.1883 En ligne : https://drive.google.com/file/d/1tNvJwDvWFCky3KsVs2MkLFhq5fYBNXwz/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3081 [article]

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