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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Global modeling for single screw extrusion of viscoplastics / A. Lewandowski in INTERNATIONAL POLYMER PROCESSING, Vol. XXXV, N° 1 (03/2020)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXV, N° 1 (03/2020) . - p. 26-36 Titre : Global modeling for single screw extrusion of viscoplastics Type de document : texte imprimé Auteurs : A. Lewandowski, Auteur ; Krzysztof J. Wilczynski, Auteur Année de publication : 2020 Article en page(s) : p. 26-36 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Extrudeuse monovis Matières plastiques -- Extrusion Modèles numériques Rhéologie Viscoplasticité Index. décimale : 668.4 Plastiques, vinyles Résumé : An extensive modeling study is presented on viscoplastic flows in the single screw extruder. An effective modeling procedure is developed, and fully three-dimensional Non-Newtonian FEM computations are performed to design the screw and die characteristics which may be implemented into the global model of the process. ANSYS Polyflow software is applied to model these viscoplastic flows. An analysis is performed for the flow with yield stress effects both in the screw and in the die. Screw characteristics and die characteristics are calculated and modeled for various viscoplasticity parameters. The effect of yield stress parameters on the extruder operation has been discussed. Note de contenu : - Yield stress analysis - Flow simulation - Die flow - Screw flow - Global modeling DOI : https://doi.org/10.3139/217.3866 En ligne : https://drive.google.com/file/d/1gEGPNCMpnqsgxuJnFgWCNtL8jZKznlMa/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33776 [article]

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Global modeling of single screw extrusion with slip effects / A. Lewandowski in INTERNATIONAL POLYMER PROCESSING, Vol. XXXIV, N° 1 (03/2019)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXIV, N° 1 (03/2019) . - p. 81-90 Titre : Global modeling of single screw extrusion with slip effects Type de document : texte imprimé Auteurs : A. Lewandowski, Auteur ; Krzysztof J. Wilczynski, Auteur Année de publication : 2019 Article en page(s) : p. 81-90 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Eléments finis, Méthode des Etat fondu (matériaux) Extrudeuse monovis Fluides non newtoniens Matières plastiques -- Extrusion Rhéologie Index. décimale : 668.4 Plastiques, vinyles Résumé : An extensive study is presented on the polymer melt flow with slip effects in a single screw extrusion process. Fully three-dimensional non-Newtonian FEM computations are performed to design the screw pumping characteristics and the die characteristics which may be implemented into the composite model of the process. ANSYS Polyflow software is applied to model the melt flow in the extruder. An analysis is performed for the flow of polymers with slip effects both in the screw (on the screw and barrel surfaces) and in the die. Screw pumping characteristics and die characteristics are calculated and modeled for various power law indices, and various slipping parameters. The effect of slipping on extruder operation is discussed. Note de contenu : - Slip analysis - Flow simulation - Die flow - Screw flow - Screw pumping characteristics - Global modeling DOI : 10.3139/217.3653 En ligne : https://www.degruyter.com/document/doi/10.3139/217.3653/pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31915 [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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Study on the polymer melt flow in a closely intermeshing counter-rotating twin screw extruder / Krzysztof J. Wilczynski in INTERNATIONAL POLYMER PROCESSING, Vol. XXIX, N° 5 (11/2014)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXIX, N° 5 (11/2014) . - p. 649-659 Titre : Study on the polymer melt flow in a closely intermeshing counter-rotating twin screw extruder Type de document : texte imprimé Auteurs : Krzysztof J. Wilczynski, Auteur ; A. Lewandowski, Auteur Année de publication : 2014 Article en page(s) : p. 649-659 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Eléments finis, Méthode des Etat fondu (matériaux) Extrudeuse bi-vis Fluides non newtoniens Modélisation tridimensionnelle Polymères Rhéologie Index. décimale : 668.9 Polymères Résumé : An extensive study has been presented on the polymer melt flow in a closely intermeshing counter-rotating twin screw extruder. A fully three-dimensional non-Newtonian FEM computations have been performed to design the screw pumping characteristics which may be implemented into the composite model of the process. ANSYS Polyflow software has been applied to model the melt flow in the machine. An analysis has been performed for the flow in the C-chamber, and the leakage flows have been identified over the calender gap, tetrahedron gap, flight gap, and side gap. Screw pumping characteristics have been calculated and modeled for screw elements at various power law indices. It has been observed that a thick flighted element due to the positive displacement effect has got high pumping capacity increasing with an increase of the power law index. A shearing element has got no pumping capacity, and in this case a pressure gradient must be applied to push the material through an element, and the gradient increases with an increase of the power law index. Negative pressure gradient has been observed for thick flighted elements at some simulation data, and a respective reorientation of the velocity flow field has been seen. Note de contenu : - FLOW MECHANISM - FLOW SIMULATION : 1. Simulation Procedure - 2. Simulation Results - SCREW PUMPING CHARACTERISTICS DOI : 10.3139/217.2962 En ligne : https://drive.google.com/file/d/1aNNShBQJrcEtAuFDjIuLO-iIVsWWGToW/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22245 [article]

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