Understanding kneading holistically / Jochen Kettemann in KUNSTSTOFFE INTERNATIONAL, Vol. 110, N° 6 (2020)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 110, N° 6 (2020) . - p. 40-44 Titre : Understanding kneading holistically Titre original : Predict co-kneader behavior efficiently with procedural understanding Type de document : texte imprimé Auteurs : Jochen Kettemann, Auteur ; Christian Bonten, Auteur ; Rebecca Wolff, Auteur ; Johannes Rudloff, Auteur ; Marieluise Lang, Auteur ; Thomas Hochrein, Auteur ; Martin Bastian, Auteur Année de publication : 2020 Article en page(s) : p. 40-44 Langues : Anglais (eng) Catégories : Compoundage Malaxeurs et mélangeurs Polyéthylène Polymères -- Fusion Polystyrène Simulation par ordinateur Index. décimale : 668.4 Plastiques, vinyles Résumé : Thanks to its special working principle, the co-kneader fulfills top mixing requirements. Until now, however, its design could not be based on simulation, because processing knowledge and modeling approaches were lacking. Systematic investigation together with analytical and numerical models overcome this hurdle and provide the basis for computer-aided optimization. Note de contenu : - The co-kneader - Experimental investigation - Figure : A look inside the co-kneader whose behavior when processing polyethylene and polystyrene and polystyrene was simulated - Fig. 1 : Power introduced and melt temperatures at the end of the extruder shown with various screw configuration at 8 kg/h throughput and 400 rpm - Fig. 2 : Simplification of the calculation geometry with axial and radial boundaries using the example of a three-flight co-kneader (geometry 1) - Fig. 3 : Simulated geometry variations : geometries 1 and 2 are three-flight co-kneaders, geometry 3 and 4 have 4 flights. The difference between geometry 1 and 2 is between flight width. Geometry 3 and 4 differ in respect to flight width and length - Fig. 4 : Velocity profiles of characteristic flight positions of a four-flight co-kneader (geometry 3, KL element). The flow field was cut radially, a color scale shows the different velocities, arrows their direction - Fig. 5 : Comparison of the average shear rates for geometries 1 to 4 - Fig. 6 : Comparison ofsimulated pressures, filling levels, and melting degrees of PE : conveying elements are interrupted in the screw drawing, and kneading elements are shown fully - Fig. 7 : Comparison of simulated and measured values : The acumulated minimum or average dwell times and the powers, each for different operating points with PE as the matrix material - Fig. 8 : Velocity field of a three-dimensional co-kneader simulation (four-flight kneader : geometry 3) in OpenFoam with real screw motion using the Immersed boundary Surface method En ligne : https://drive.google.com/file/d/1bhvfMlKf5O1WUijrt0SdSzP2wYPFghIP/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34716 [article]

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