A composite model for melting, pressure and fill factor profiles in a metered fed closely intermeshing counter-rotating twin screw extruder / Krzysztof J. Wilczynski in INTERNATIONAL POLYMER PROCESSING, Vol. XXII, N° 2 (05/2007)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXII, N° 2 (05/2007) . - p. 198-203 Titre : A composite model for melting, pressure and fill factor profiles in a metered fed closely intermeshing counter-rotating twin screw extruder Type de document : texte imprimé Auteurs : Krzysztof J. Wilczynski, Auteur ; J. L. White, Auteur ; Q. Jiang, Auteur Année de publication : 2007 Article en page(s) : p. 198-203 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : A composite model of solids conveying, melting and melt flow in a closely intermeshing counter-rotating twin-screw extruder of modular design has been developed. This is based on combining melt conveying models with new melting and solids conveying models. Computations are made for axial fill factor, pressure, temperature and melting profiles. The results are compared with experiment. DOI : 10.3139/217.2001 En ligne : https://drive.google.com/file/d/1Nxbk6ZW8XoD5gnGLzjnohS43WynNXpJ4/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2760 [article]

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Experimental and theoretical study on screw filling in starve fed single screw extruders / Krzysztof J. Wilczynski in INTERNATIONAL POLYMER PROCESSING, Vol. XXXIII, N° 2 (05/2018)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXIII, N° 2 (05/2018) . - p. 171-179 Titre : Experimental and theoretical study on screw filling in starve fed single screw extruders Type de document : texte imprimé Auteurs : Krzysztof J. Wilczynski, Auteur Année de publication : 2018 Article en page(s) : p. 171-179 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Extrudeuse monovis Facteur de remplissage (technologie) Matières plastiques -- Extrusion Polyéthylène basse densité Polyéthylène haute densité Polymères -- Fusion Pression Température Index. décimale : 668.4 Plastiques, vinyles Résumé : An extensive experimental and theoretical study has been performed on screw filling in starve fed/flood fed single screw extruders. The effect of screw speed, flow rate (level of starvation) and die geometry has been investigated. A “screw pulling-out” technique was used in the study. The solid conveying, melting positions, the extent of starvation, and the fully filled regions were observed. It was seen that filling of the screw increases with an increase of the flow rate at a fixed screw speed, and decreases with an increase of the screw speed at a fixed flow rate. The screw filling is strongly dependent on the die geometry and increases with an increase of the resistance of the die. The pressure was also measured, and it was observed that it considerably decreases with starvation. Mechanism of screw filling has been discussed. The simulations and experiments were performed for low density polyethylene (LDPE) and high density polyethylene (HDPE) at various operating conditions, both for starve fed and flood fed extrusion. Fill factor, pressure, temperature and melting profiles have been computed and validated experimentally. All the experimental observations were consistent with the simulations. Note de contenu : - Starve feeding vs. flood feeding - Simulations - Experimental validation of process simulation DOI : 10.3139/217.3386 En ligne : https://drive.google.com/file/d/1TFYZRY4IEBnZzYZJHwYR73VM1CoOIZyQ/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30565 [article]

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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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Experimental study of melting in an intermeshing counter-rotation twin screw / Krzysztof J. Wilczynski in INTERNATIONAL POLYMER PROCESSING, Vol. XVI, N° 3 (09/2001)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XVI, N° 3 (09/2001) . - p. 257-262 Titre : Experimental study of melting in an intermeshing counter-rotation twin screw Type de document : texte imprimé Auteurs : Krzysztof J. Wilczynski, Auteur ; J. L. White, Auteur Année de publication : 2001 Article en page(s) : p. 257-262 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : An experimental study is presented of the melting mechanism in a starve fed closely intermeshing counter-rotating twin screw extruder of a modular Leistritz design. Polypropylene and low density polyethylene as well as different screw configurations of thick flighted and thin flighted elements were investigated, at various operating conditions. A "Screw Pulling-out Technique" was used to characterize polymer behaviour along the screw axis. In particular, the solid conveying, melting positions, the extent of starved character along the screw, and the fully filled region were observed. Polymer samples were stripped off from each screw which was removed from the machine to investigate melting mechanism. Generally, it was concluded that the melt mechanism consists of pellets being dragged into the calendering gap where they are melted due to calendering action. In the case of thick flighted screws, the molten polymer is expelled from the gap and pushes against the pellet bed which is continuously dragged into the gap. Note de contenu : - General observations - Influence of screw configuration (Screw configuration A, Screw configuration B, Screw configuration C - Influence of operating conditions (Flow rate, Screw speed, Effect of material) - Examination of carcasses - DISCUSSION : Observations related to scew fill - Melting DOI : 10.3139/217.1645 En ligne : https://drive.google.com/file/d/112o1R9BqvU1FAsmcZoyK9h82VyvVISex/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15906 [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)  

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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)  

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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)  

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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)  

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