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An annular rotating-die technique in extrusion process : effect of Mandrel rotating speed on extrudate swell behavior of HDPE parison / N.-T. Intawong in INTERNATIONAL POLYMER PROCESSING, Vol. XXIX, N° 5 (11/2014)
[article]
Titre : An annular rotating-die technique in extrusion process : effect of Mandrel rotating speed on extrudate swell behavior of HDPE parison Type de document : texte imprimé Auteurs : N.-T. Intawong, Auteur ; A. Darajang, Auteur ; S. Udomsom, Auteur ; T. Yoochoosai, Auteur ; C. Kantala, Auteur Année de publication : 2014 Article en page(s) : p. 607-615 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Extrudeuse monovis
Extrudeuse rotative
Matières plastiques -- Moulage par extrusion-soufflage
Polyéthylène haute densitéIndex. décimale : 668.9 Polymères Résumé : This work aims to propose an annular rotating-die technique which is specifically designed and constructed in order for the mandrel to rotate in the stationary barrel during extrusion. The annular rotating-die was employed to study the effect of the mandrel rotating speeds on the extrudate swell behavior of HDPE parison in single screw extruder at a test temperature of 210°C. The results of experiment found that rotation of mandrel caused significant change in dimension of HDPE parison after it flowed out from the annular rotating-die. It was also found that at the same apparent shear rate, the diameter swell decreased with increasing mandrel rotating speed whereas the thickness swell yielded opposite results. These results could be explained by the change of flow direction during the flow of HDPE melt in the annular rotating-die. Furthermore, the annular rotating-die technique proposed in this research could be applied in adjusting size of diameter and thickness and in predicting thickness of HDPE parison during extrusion with no need to change any production parameter in the polymer extruder. Note de contenu : - EXPERIMENTAL : 1. Raw material - 2. Experimental apparatus and procedures - 3. Apparent shear rate calculation - 4. Measurements of the extrudate swell
- RESULTS AND DISCUSSION : 1. Development of HDPE parison Dimension after exiting from the annular rotating-die - 2. swelling properties of HDPE parison in an annular rotating-die - 3. Application of annular rotating-die technique in extrusion processDOI : 10.3139/217.2930 En ligne : https://drive.google.com/file/d/1tLPjdpXncHHo2aDcykDzGVhJPQM2w01n/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22227
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Code-barres Cote Support Localisation Section Disponibilité 16633 - Périodique Bibliothèque principale Documentaires Disponible Analysis of a single screw extruder with a grooved plasticating barrel - Part I : the melting model / José Antonio Avila Alfaro in INTERNATIONAL POLYMER PROCESSING, Vol. XXX, N° 2 (05/2015)
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Titre : Analysis of a single screw extruder with a grooved plasticating barrel - Part I : the melting model Type de document : texte imprimé Auteurs : José Antonio Avila Alfaro, Auteur ; Eberhardt Grünschloß, Auteur ; Stefan Epple, Auteur ; Christian Bonten, Auteur Année de publication : 2015 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Extrudeuse monovis
Matières plastiques -- Extrusion -- Appareils et matériels
Modèles mathématiques
Polymères -- Fusion
Prévision, Théorie de la
Vis barrièreIndex. décimale : 668.4 Plastiques, vinyles Résumé : Single screw extruders with barrier screws, grooved feed zones and grooved melting zones were introduced to the European plastics industry in 1999. These extruders have an improved melting and conveying capacity among other advantages, such as a lower melt temperature, less wear, less torque and less energy consumption. The aim of this paper is to present a mathematical model for predicting the melting rate in this type of extrusion system. Based on the classical melting mechanism observed in conventional extruders, it was possible to study the effect of the geometry of the grooved barrel on the melting rate of a polymer. It was shown that the grooves on the barrel notably increase the melting rate, when compared to conventional single screw extruders. A good agreement between theory and experimental data was found. Note de contenu : - THEORETICAL MODEL : Melting rate in the space between two grooves
- EXPERIMENTS : Model validation - Parameter study
- RESULTS AND DISCUSSION : Solid bed length validation - Melting rate validation - Parameter study - Extruder simulationDOI : 10.3139/217.3021 En ligne : https://drive.google.com/file/d/1ovEnaF589jCnoFhVELhjOll5L4VAA8D8/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23911
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Code-barres Cote Support Localisation Section Disponibilité 17180 - Périodique Bibliothèque principale Documentaires Disponible Analysis of a single-screw extruder with a grooved plasticizing barrel – experimental investigation / Jochen Kettermann in INTERNATIONAL POLYMER PROCESSING, Vol. XXXIV, N° 1 (03/2019)
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Titre : Analysis of a single-screw extruder with a grooved plasticizing barrel – experimental investigation Type de document : texte imprimé Auteurs : Jochen Kettermann, Auteur ; José Antonio Avila Alfaro, Auteur ; Christian Bonten, Auteur Année de publication : 2019 Article en page(s) : p. 143-150 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Extrudeuse monovis
Extrudeuses -- AnalyseIndex. décimale : 668.4 Plastiques, vinyles Résumé : In the field of extrusion, a very promising high performance extruder was introduced to the European plastics industry in 1999. This new type of single-screw extruder combines a grooved plasticizing barrel with a barrier screw. Compared to conventional extrusion systems, these extruders have by far a higher output and product quality among other advantages such as lower processing costs and lower energy consumption. In the past, both Newtonian and non-Newtonian models were developed to calculate and predict the melting rate along the flow channel. The aim of this paper is to present experimental investigations on the processes within the melting zone of a single-screw extruder with a grooved plasticizing barrel. To visualize the melting mechanisms, screw extraction experiments as well as dynamic pressure measurements were performed. By means of screw extraction experiments a solid bed was clearly identified only in the solid channel and a melt pool only in the melt channel. Analysis of the dynamic pressure signals also showed the same behavior and therefore allowed in-line characterization of the melting process. Thus, theoretical concepts about the melting mechanisms could be confirmed experimentally. Note de contenu : - EXPERIMENT : Material - Experimental setup - Experimental procedure
- RESULTS AND DISCUSSION : Mass throughput - Pressure, temperature and process data - Dynamic pressure - Screw extraction experiments - Analytical simulation of the melting zoneDOI : 10.3139/217.3732 En ligne : https://www.degruyter.com/document/doi/10.3139/217.3732/pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31926
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Code-barres Cote Support Localisation Section Disponibilité 20669 - Périodique Bibliothèque principale Documentaires Disponible Analyzing the influence of surface renewal on diffusive mass transport in vented single-screw extruders / Christian Marschik in INTERNATIONAL POLYMER PROCESSING, Vol. XXXII, N° 3 (07/2017)
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Titre : Analyzing the influence of surface renewal on diffusive mass transport in vented single-screw extruders Type de document : texte imprimé Auteurs : Christian Marschik, Auteur ; B. Löw-Baselli, Auteur ; Jürgen Miethlinger, Auteur Année de publication : 2017 Article en page(s) : p. 387-393 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Extrudeuse monovis
Matières plastiques -- Extrusion
Modèles numériques
RhéologieIndex. décimale : 668.4 Plastiques, vinyles Résumé : We present a semi-numerical modeling approach to analyzing the role of surface renewal during bubble-free devolatilization in vented single-screw extruders. To demonstrate the significance of surface renewal in the mass transport of volatiles, we derived approximate analytical solutions for the two-dimensional circulatory flow in a partially filled screw channel, placing special emphasis on the melt pool that forms in front of the active flight. By applying the resulting velocity field to the governing conservation equation for the volatile concentration in the polymeric phase, the convective influence of the polymer flow on mass transport is taken into account. The resulting convection-diffusion equation, which is solved numerically using the finite-volume method, provides both qualitative and quantitative insights into how volatile depletion in the melt pool is related to the flow field developed. Thus, we clearly demonstrate that surface renewal improves mass transport efficiency considerably, even at very low screw speeds. Note de contenu : DEVOLATILIZATION IN VENTED SINGLE-SCREW EXTRUDERS : Mass transport in partially filled screw channels - Modeling diffusive mass transport in the melt pool
- MODELING FRAMEWORK : Modeling the flow in the melt pool - Modeling diffusive mass transport in moving fluids
- RESULTS AND DISCUSSION : Circulatory flow in the melt pool - Influence of surface renewal on diffusive mass transport - Influence of test parametersDOI : 10.3139/217.3373 En ligne : https://drive.google.com/file/d/1r3j9c2fG8H0VagHWgCOr3jqZyDxlzMFY/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28840
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Code-barres Cote Support Localisation Section Disponibilité 19064 - Périodique Bibliothèque principale Documentaires Disponible CFD analysis of the frame invariance of the melt temperature rise in a single-screw extruder / F. Habla in INTERNATIONAL POLYMER PROCESSING, Vol. XXVIII, N° 5 (11/2013)
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Titre : CFD analysis of the frame invariance of the melt temperature rise in a single-screw extruder Type de document : texte imprimé Auteurs : F. Habla, Auteur ; S. Obermeier, Auteur ; L. Dietsche, Auteur ; O. Kintzel, Auteur ; Olaf Hinrichsen, Auteur Année de publication : 2013 Article en page(s) : p. 463-469 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Etat fondu (matériaux)
Extrudeuse monovis
Fluides newtoniens
Fluides, Mécanique des
Matières plastiques -- Extrusion
Mécanique des fluides numériquesLa mécanique des fluides numérique (MFN), plus souvent désignée par le terme anglais computational fluid dynamics (CFD), consiste à étudier les mouvements d'un fluide, ou leurs effets, par la résolution numérique des équations régissant le fluide. En fonction des approximations choisies, qui sont en général le résultat d'un compromis en termes de besoins de représentation physique par rapport aux ressources de calcul ou de modélisation disponibles, les équations résolues peuvent être les équations d'Euler, les équations de Navier-Stokes, etc.
La CFD a grandi d'une curiosité mathématique pour devenir un outil essentiel dans pratiquement toutes les branches de la dynamique des fluides, de la propulsion aérospatiale aux prédictions météorologiques en passant par le dessin des coques de bateaux. Dans le domaine de la recherche, cette approche est l'objet d'un effort important, car elle permet l'accès à toutes les informations instantanées (vitesse, pression, concentration) pour chaque point du domaine de calcul, pour un coût global généralement modique par rapport aux expériences correspondantes.
Domaines d'application : La CFD est particulièrement employée dans les domaines des transports, pour étudier notamment le comportement aérodynamique des véhicules (automobile, aéronautique, etc) conçus.
La CFD est également utilisée dans le domaine des installations critiques telles que les salles de serveurs. Elle permet de réaliser une représentation 3D de la salle, comprenant toutes les informations relatives aux équipements informatiques, électriques et mécaniques. On obtient une carte graduée des différentes zones de chaleur présentes, ce qui permet de détecter les zones critiques et les points chauds (ou "hot spots").
Polycarbonates
Simulation par ordinateurIndex. décimale : 668.4 Plastiques, vinyles Résumé : In analytical analyses for single-screw extruders the simplified approach of rotating the barrel and keeping the screw fixed is often used instead of rotating the screw and fixing the barrel. Although the flow field is independent of the reference frame, as has already been shown to a satisfactory degree (Rauwendaal etal., 1997), the question of the dependence of the melt temperature rise on the reference frame is still being challenged, e.g. Campbell etal. (2001, 2008). In this work we develop a finite-volume CFD code allowing for the three-dimensional simulation of the flow and temperature rise in both reference frames. The question of frame invariance is addressed by simulating the flow of a Newtonian-like polycarbonate both in a two-dimensional cross-section of a single-screw extruder and in a three-dimensional model with two full turns of the screw. Our results show that the kinematics and the melt temperature rise are equal for screw- and barrel-rotation and thus independent of the reference frame. Furthermore, the presence of a clearance flow has a negligible influence on the temperature rise. Note de contenu : - THEORY : Viscous dissipation - Conservation laws - Single-screw extruder modeling - Fluid rheology - Numerical methodology
- RESULTS AND DISCUSSION : Two-dimensional cross-section - Three-dimensional simulationsDOI : 10.3139/217.2753 En ligne : https://drive.google.com/file/d/14AAGUen3zbK5mQAMOg9aAxXeKRdvNpzK/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19892
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Code-barres Cote Support Localisation Section Disponibilité 15682 - Périodique Bibliothèque principale Documentaires Disponible Compoundage et caractérisation rhéologique simultanée / Jacques Bouton in PLASTIQUES & ELASTOMERES MAGAZINE, N° 52-1 (03/2000)
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PermalinkGlobal modeling for single screw extrusion of viscoplastics / A. Lewandowski in INTERNATIONAL POLYMER PROCESSING, Vol. XXXV, N° 1 (03/2020)
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PermalinkInfluence of processing conditions on productivity, thermal and rheological properties of reprocessed low density polyethylene / V. Pistor in INTERNATIONAL POLYMER PROCESSING, Vol. XXVI, N° 4 (09/2011)
PermalinkMelt filtration on the injection molding machine / Reinhard Bauer in KUNSTSTOFFE INTERNATIONAL, Vol. 103, N° 4 (04/2013)
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PermalinkMelting mechanism of thermoplastic elastomers and comparison to polyolefin thermoplastic melting studies in a single screw extruder / W.-J. Lu in INTERNATIONAL POLYMER PROCESSING, Vol. XXIII, N° 1 (03/2008)
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