In situ studies and simulations of mould filling with a model system for PIM / H. Persson in INTERNATIONAL POLYMER PROCESSING, Vol. XXIV, N° 5 (11/2009)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXIV, N° 5 (11/2009) . - p. 406-413 Titre : In situ studies and simulations of mould filling with a model system for PIM Type de document : texte imprimé Auteurs : H. Persson, Auteur ; M. Jenni, Auteur ; L. Nyborg, Auteur ; M. Rigdahl, Auteur Année de publication : 2009 Article en page(s) : p. 406-413 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : The processing conditions and the mould design are important parts of the powder injection moulding (PIM) process. In the present work, the mould filling phase of the process has been studied in situ with a special mould equipped with a sight glass using a high speed camera. Effects of features such as the mould temperature, the melt temperature, the surface roughness of the mould cavity, the gate dimensions, the mould design and the flow rate on the filling behaviour were demonstrated. In particular it was noted that a rougher mould surface to some extent facilitated the filling of the mould. The mould temperature, the nominal melt temperature and the flow rate affected the position of weld lines via the cooling of the feedstock and the corresponding change of the melt viscosity. The experimentally determined weld-line positions were compared with predictions from numerical simulations performed with the commercial software Moldex3D. The agreement between the experiment and the prediction was in most cases quite fair or good. The in situ observation of the mould filling also provided the possibility to study how the gate dimensions and the flow rate influenced the jetting behaviour. DOI : 10.3139/217.2277 En ligne : https://drive.google.com/file/d/1bh8Bw7shoSxGtRs7jQjZK0MmP9ROwB0A/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6363 [article]

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Rheological and thermal properties of a model system for PIM / H. Persson in INTERNATIONAL POLYMER PROCESSING, Vol. XXIV, N° 2 (05/2009)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXIV, N° 2 (05/2009) . - p. 206-212 Titre : Rheological and thermal properties of a model system for PIM Type de document : texte imprimé Auteurs : H. Persson, Auteur ; B. Hausnerova, Auteur ; L. Nyborg, Auteur ; M. Rigdahl, Auteur Année de publication : 2009 Article en page(s) : p. 206-212 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Powder injection moulding (PIM) is an important and accepted industrial technique for net shaping of precision components which can have a rather complex geometry. In order to meet the imposed, often rather strict, requirements with regard to dimensional accuracy, it is important to have an adequate knowledge and control of the rheological behaviour and the related processing properties of the powder/polymer melt (feedstock). Such a knowledge is furthermore of crucial importance in numerical simulations of the PIM-process. In the present work, a model system, consisting of steel powder, poly(ethylene glycol) and wax, is used in order to illustrate how the viscometric properties as well as thermal properties, such as the conductivity and the specific heat, of the system can be related to the corresponding properties of the polymeric binder system. In a similar way, the pvT (pressure-volume-temperature)-behaviour of the model system is analysed and discussed. The pvT-behaviour, which has not been extensively reported on for PIM-feedstocks, is considered to be of significant relevance for controlling the outcome of the injection moulding process. DOI : 10.3139/217.2243 En ligne : https://drive.google.com/file/d/1SBzSGhRN83l7dg6qNTRIYDFr_ompnmHg/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5253 [article]

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