Factors influencing the warpage in in-mold decoration injection molded composites / D. Lee in INTERNATIONAL POLYMER PROCESSING, Vol. XXVIII, N° 2 (05/2013)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVIII, N° 2 (05/2013) . - p. 221-227 Titre : Factors influencing the warpage in in-mold decoration injection molded composites Type de document : texte imprimé Auteurs : D. Lee ; W. A. Chen ; T.-W. Huang ; S.-J. Liu Année de publication : 2013 Article en page(s) : p. 221-227 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Composites à fibres de verre Décoration dans le moule Gauchissement (matériaux) Matières plastiques -- Décoration Matières plastiques -- Moulage par injection Polyéthylène téréphtalate Taguchi, Méthodes de (Contrôle de qualité) Index. décimale : 668.9 Polymères Résumé : This report studied, both experimentally and numerically, the factors affecting the warpage in in-mold decoration (IMD) injection molded parts. All experiments were conducted on an 80-ton injection-molding machine. The materials used in the experiments included poly(ethylene terephthalate) (PET) films and 30 % glass fiber-filled PET resins. U-shaped plate parts with three different angles (90°, 135°, and 150°) at the corners were molded. The influence of various processing parameters on part warpage was investigated using an experimental matrix, with its design based on the experimental-parameterdesign method developed by Taguchi. The experimental results suggested that all molded parts warped toward the side of the decoration film. For the parameters selected in the experiments, the corner angle and the melt injection pressure were found to be the principal factors affecting the warpage of IMD injection molded parts. The 90° angled parts exhibited the greatest amount of warpage, while the 150° angled parts showed the least amount of warpage. Additionally, a commercially available code (Moldex® 3-D) was used to simulate the temperature distribution during the filling process and the molded part warpage. Calculated warpage satisfactorily matched with the experimental data. It has been shown that the warpage of IMD injection molded parts is mainly caused by the imbalanced temperature distribution during cooling, due to the part geometry and the decoration films. Note de contenu : - EXPERIMENTAL PROCEDURE - NUMERICAL SIMULATION - RESULTS AND DISCUSSION : Effects of processing parameters on molded warpage - Numerical simulation of temperature and part warpage DOI : 10.3139/217.2690 En ligne : https://drive.google.com/file/d/1pmVC5rtrdCbcKaPDuQGQLJeJFZF9tTMo/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18435 [article]

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