Analytical model for the throughput and drive power calculation in the melting section of single screw plasticizing units considering wall-slippage / H. Potente in INTERNATIONAL POLYMER PROCESSING, Vol. XXIV, N° 1 (03/2009)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXIV, N° 1 (03/2009) . - p. 23-30 Titre : Analytical model for the throughput and drive power calculation in the melting section of single screw plasticizing units considering wall-slippage : Part 1 : Wall-slippage in the melt film Type de document : texte imprimé Auteurs : H. Potente, Auteur ; M. Bornemann, Auteur ; M. Kurte-Jardin, Auteur Année de publication : 2009 Article en page(s) : p. 23-30 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Couches minces Films plastiques Frottements (mécanique) Matières plastiques -- Extrusion Polymères Index. décimale : 668.9 Polymères Résumé : In single-screw extrusion the simulation of the plasticizing process by means of software tools becomes more and more important. These programs need mathematical models that have to be improved continuously to simulate the process values realistically. A two-part article presents an analytical approach to calculate the pressure/throughput and drive power behaviour of wall-slipping polymers in the melting section of single-screw plasticizing units. The investigations that are conducted are based on the notion commonly found in the literature of a melt film forming between the barrel and a compact solid bed, with the simultaneous development of a melt pool. As boundary condition for describing the wall slippage, a critical shear stress, as of which a slippage process commences, and also a slippage-velocity-dependent shear stress is assumed. In this first part of the publication, the investigations focus on the processes that take place in the melt film. A new model is developed for describing the process behaviour in this area. DOI : 10.3139/217.2163 En ligne : https://drive.google.com/file/d/1NFmuwpGWyKyi7GsHPLV8GWMqJwEr939O/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4204 [article]

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Analytical model for the throughput and drive power calculation in the melting section of single screw plasticizing units considering wall-slippage / H. Potente in INTERNATIONAL POLYMER PROCESSING, Vol. XXIV, N° 1 (03/2009)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXIV, N° 1 (03/2009) . - p. 31-40 Titre : Analytical model for the throughput and drive power calculation in the melting section of single screw plasticizing units considering wall-slippage : Part 2 : Wall-slippage in the melt pool and coupling of the system Type de document : texte imprimé Auteurs : H. Potente, Auteur ; M. Bornemann, Auteur ; M. Kurte-Jardin, Auteur Année de publication : 2009 Article en page(s) : p. 31-40 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Couches minces Films plastiques Frottements (mécanique) Matières plastiques -- Extrusion Polymères Index. décimale : 668.9 Polymères Résumé : A two-part article presents a process model developed at the KTP for describing the pressure/throughput and drive power behaviour of wall-slipping polymers in the melting section of single-screw plasticizing units. After a new model for describing the flow behaviour in the melt film was developed in the first part of the paper, this second part now covers the adaptation of an existing process model for pure melt conveyance to allow for the processes that take place in the melt pool, and the extension of the model to include the drive power calculation. Following this, the two individual models are then coupled through the assumption of a constant pressure gradient in the conveying direction. Using the overall model that is generated, the pressure/throughput and power behaviour during melting are investigated on the basis of the influencing dimensionless variables. This requires the geometry of the solid bed and the solid bed velocity to be specified as input variables. Apart from this, the other material parameters that need to be defined are the viscosity of the polymer melt, the critical shear stress, a material-specific parameter for describing the slipping-velocity-dependent shear stress and the operating point of the process that is taken as a basis. DOI : 10.3139/217.2164 En ligne : https://drive.google.com/file/d/1feemEa9GlLS8s0gso6jb7AjmJ11yozde/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4205 [article]

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Calculating large filter surface areas / Wolfgang Ernst in KUNSTSTOFFE INTERNATIONAL, Vol. 98, N° 2/2008 (02/2008)

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 98, N° 2/2008 (02/2008) . - p. 29-32 Titre : Calculating large filter surface areas Type de document : texte imprimé Auteurs : Wolfgang Ernst, Auteur ; Birgit Funke, Auteur ; H. Potente, Auteur ; Knut Hobrecht, Auteur ; Ralf Schlottmann, Auteur Année de publication : 2008 Article en page(s) : p. 29-32 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.4 Plastiques, vinyles Résumé : Melt filtration - The demanding standards regarding melt quality in fiber and film systems require the use of large-area melt filters. To design and optimize such filters, a computation tool has been developed that allows the essential process data such as required pressure, throughput distribution or residence time to be determined. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6630 [article]

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Description of the pressure/throughput behavior of a single-screw plasticating unit in consideration of wall slippage effects for non-newtonian material and 1-D flow / H. Potente in INTERNATIONAL POLYMER PROCESSING, Vol. XXI, N° 3 (07/2006)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXI, N° 3 (07/2006) . - p. 272-282 Titre : Description of the pressure/throughput behavior of a single-screw plasticating unit in consideration of wall slippage effects for non-newtonian material and 1-D flow Type de document : texte imprimé Auteurs : H. Potente, Auteur ; M. Kurte-Jardin, Auteur ; K. Timmermann, Auteur Année de publication : 2006 Article en page(s) : p. 272-282 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Up to now, existing mathematical models can only describe the throughput behaviour of compounding extruders assuming the condition of a wall adhering melt. However, there is a variety of polymer melts, as well as polymer suspensions, ceramic materials and food stuffs, which in the course of manufacturing are wall-slipping. A mathematical model describing the behaviour of the isothermal flow of non-Newtonian materials is developed. In addition to the development of the analytical model, which is based on Flumerfelt et al. [1] and Hirshberger [2], the flow behaviour of wall-slipping polymer melts is also analysed using Finite-Element-Simulations (FE). Comparison of the results for pressure, throughput and velocity profiles along the channel depth shows a very high degree of agreement. DOI : 10.3139/217.0096 En ligne : https://drive.google.com/file/d/1thtXyGWjdfF-TlzhN4ULIANZmlZ_7tUo/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2841 [article]

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Influence of non-newtonian behaviour on the processing characteristics of wall-slipping materials / H. Potente in INTERNATIONAL POLYMER PROCESSING, Vol. XVIII, N° 2 (06/2003)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XVIII, N° 2 (06/2003) . - p. 115-121 Titre : Influence of non-newtonian behaviour on the processing characteristics of wall-slipping materials Type de document : texte imprimé Auteurs : H. Potente, Auteur ; M. Kurte, Auteur ; H. Ridder, Auteur Année de publication : 2003 Article en page(s) : p. 115-121 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : So far it has been assumed that when describing the flow process in single-screw extruder, the melt will be wall-adhering. Using certain process conditions, however, some materials such as PVCs, high-molecular PEs, elastomers, polymer suspensions, ceramic materials and food products become wall-slipping [1 to 4]. During simulation of the flow process using the Finite Element Method (FEM), the boundary condition of "wall-adhering" was substituted for "wall-slipping". The numeric results refer to one-dimensional, non-Newtonian, isothermal flow processes and have been evaluated accordingly. Since the wall-slipping properties are dependent on critical shear stress, the influence of non-Newtonian behaviour on wall shear stress is illustrated by investigating the barrel and screw root surface. Conclusions with regard to wall-slipping properties may be drawn from the resulting upper and lower limits. The effect of wall slippage on pressure/throughput behaviour is examined along with the various velocity profiles, resulting from different compression ratios, dimensionless critical shear stress, material-related constants and screw configuration. DOI : 10.3139/217.1730 En ligne : https://drive.google.com/file/d/1zEsbxRxO7_ZXFLcDWrVUTXNWMv9avGS-/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3300 [article]

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Influence of power law and isothermal simplification on the accuracy in single screw extrusion / H. Potente in INTERNATIONAL POLYMER PROCESSING, Vol. XX, N° 4 (12/2005)  

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Investigations into kinematic reversal in non-isothermal flows in single-screw machines / H. Potente in INTERNATIONAL POLYMER PROCESSING, Vol. XXI, N° 2 (05/2006)  

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Measuring under pressure / H. Potente in KUNSTSTOFFE INTERNATIONAL, Vol. 98, N° 12/2008 (12/2008)

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Melting of polymer blends in co-rotating twin screw extruders / H. Potente in INTERNATIONAL POLYMER PROCESSING, Vol. XVI, N° 2 (06/2001)  

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Melting of polymer blends in co-rotating twin screw extruders / H. Potente in INTERNATIONAL POLYMER PROCESSING, Vol. XVI, N° 2 (06/2001)  

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Method for the optimisation of screw elements for tightly intermeshing, co-rotating twin screw extruders / H. Potente in INTERNATIONAL POLYMER PROCESSING, Vol. XXI, N° 2 (05/2006)  

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Modeling the temperature development of wall-slipping polymers in single-screw channels / M. Kurte-Jardin in INTERNATIONAL POLYMER PROCESSING, Vol. XXIV, N° 2 (05/2009)  

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Non-isothermal model for the drive power calculation of single-screw plasticating units / H. Potente in INTERNATIONAL POLYMER PROCESSING, Vol. XXIII, N° 3 (07/2008)  

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Physico-mathematical model for the description of the temperature development and the power consumption in co-rotating twin screw extruders / H. Potente in INTERNATIONAL POLYMER PROCESSING, Vol. XIX, N° 1 (03/2004)  

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Polymer blends in co-rotating twin-screw extruders / H. Potente in INTERNATIONAL POLYMER PROCESSING, Vol. XVI, N° 1 (03/2001)  

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Polymer pellet flow out of the hopper into the first section of a single screw / H. Potente in INTERNATIONAL POLYMER PROCESSING, Vol. XVII, N° 1 (03/2002)  

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Pressure/throughput behavior of a single-screw plasticising unit in consideration of wall slippage / H. Potente in INTERNATIONAL POLYMER PROCESSING, Vol. XVII, N° 2 (06/2002)  

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Process behaviour of special mixing elements in twin-screw extruders / H. Potente in INTERNATIONAL POLYMER PROCESSING, Vol. XVI, N° 4 (12/2001)  

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Screw drive power of single screw plasticating units with smooth barrels / H. Potente in INTERNATIONAL POLYMER PROCESSING, Vol. XIV, N° 1 (03/1999)  

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Two dimensional description of pressure-throughput behaviour of newtonian materials considering wall slippage effects / H. Potente in INTERNATIONAL POLYMER PROCESSING, Vol. XX, N° 3 (09/2005)  

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