Experimental study for extrusion of polypropylene/wood flour composites / Krzysztof J. Wilczynski in INTERNATIONAL POLYMER PROCESSING, Vol. XXX, N° 1 (03/2015)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXX, N° 1 (03/2015) . - p. 113-120 Titre : Experimental study for extrusion of polypropylene/wood flour composites Type de document : texte imprimé Auteurs : Krzysztof J. Wilczynski, Auteur ; A. Nastaj, Auteur ; A. Lewandowski, Auteur ; Krzysztof J. Wilczynski, Auteur ; K. Buziak, Auteur Année de publication : 2015 Article en page(s) : p. 113-120 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bois Composites à fibres végétales Composites à fibres végétales -- Extrusion Polypropylène Poudres Index. décimale : 668.9 Polymères Résumé : Experimental studies have been carried out for single screw extrusion of PP/wood flour composite of different concentrations of wood flour. A “screw pull-out” technique was used for investigation of the material transport, melting and screw filling. The effect of the screw speed was investigated. It was concluded that WPC extrusion is substantially different from thermoplastics extrusion. Material transport and melting are strongly dependent on the WPC composition, and operating conditions. The contiguous solids melting mechanism CSM is not observed for WPC of high WF content; however, it may be observed for WPC of lower WF content, up to 50% WF. Several steps of the process are distinguished: material compaction in the solid conveying section close to the active flight and then spreading to the rest of the material, melting which is strongly dependent on the material composition, and shear or plug flow with slipping at the walls in the melt conveying section. DOI : 10.3139/217.3007 En ligne : https://drive.google.com/file/d/1fo7zalncFdgla02vcfE-RTXc3xIV4L49/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23432 [article]

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Melting model for starve fed single screw extrusion of thermoplastics / Krzysztof J. Wilczynski in INTERNATIONAL POLYMER PROCESSING, Vol. XXVIII, N° 1 (03/2013)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVIII, N° 1 (03/2013) . - p. 34-42 Titre : Melting model for starve fed single screw extrusion of thermoplastics Type de document : texte imprimé Auteurs : Krzysztof J. Wilczynski, Auteur ; A. Nastaj, Auteur ; Krzysztof J. Wilczynski, Auteur Année de publication : 2013 Article en page(s) : p. 34-42 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Extrudeuse monovis Modèles mathématiques Polymères -- Fusion Thermoplastiques -- Extrusion Index. décimale : 668.4 Plastiques, vinyles Résumé : Previous experimental studies of the polymer behavior in a starve fed single screw extrusion process have shown that contiguous solids melting mechanism which is observed for flood fed extrusion was not observed for starve fed extrusion. A new two-stage physical model of polymer melting in a starve fed single screw extrusion has been proposed with conductive mechanism for melting in the partially filled region and dispersed melting mechanism in the fully filled region. Mathematical models have been proposed for melting in both those regions. The models have been validated experimentally. Note de contenu : - MODEL : Melting model - Modeling of melting in a partially filled region - Modeling of meltingin a fully filled region - COMPUTATIONS - COMPARISON WITH EXPERIMENTS DOI : 10.3139/217.2640 En ligne : https://drive.google.com/file/d/12W_JOZu7ULnlwhPKjYONZMg66v-QBCCx/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17762 [article]

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Modeling for starve fed/flood fed mixing single-screw extruders / Krzysztof J. Wilczynski in INTERNATIONAL POLYMER PROCESSING, Vol. XXXI, N° 1 (03/2016)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXI, N° 1 (03/2016) . - p. 82-91 Titre : Modeling for starve fed/flood fed mixing single-screw extruders Type de document : texte imprimé Auteurs : Krzysztof J. Wilczynski, Auteur ; A. Lewandowski, Auteur ; A. Nastaj, Auteur ; Krzysztof J. Wilczynski, Auteur Année de publication : 2016 Article en page(s) : p. 82-91 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alliages polymères Calcul Eléments finis, Méthode des Extrudeuse monovis Matières plastiques -- Extrusion Polyéthylène basse densité Rhéologie Index. décimale : 668.4 Plastiques, vinyles Résumé : A composite computer model has been proposed for starve fed/flood fed mixing single screw extruders. The model for starve fed extrusion has been developed by combining a new FEM based melt conveying model with recently developed melting models. Mixing screw equipped with distributive toothed disc mixing element has been considered as an example for modeling. An extensive fully three-dimensional non-Newtonian FEM computations have been carried-out to simulate the melt flow in mixing elements. Screw pumping characteristics have been developed for the elements at various power law indices, and these have been implemented into the composite model of the process. Simulations have been performed for low density polyethylene (LDPE) at various operating conditions, both for starve fed and flood fed extrusion. Fill factor, pressure, temperature and melting profiles have been computed and verified experimentally. Note de contenu : - Modeling - FEM simulation - Computation scheme - Process simulations - Experimental validation of the model DOI : 10.3139/217.3154 En ligne : https://drive.google.com/file/d/1uq8f9Bqpf3KB3QKvCRIGo5ovDpUe3YI-/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=25771 [article]

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