Computer flow simulation of moffatt eddies in single screw extrusion / N. D. Polychronopoulos in INTERNATIONAL POLYMER PROCESSING, Vol. XXXIII, N° 5 (11/2018)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXIII, N° 5 (11/2018) . - p. 662-668 Titre : Computer flow simulation of moffatt eddies in single screw extrusion Type de document : texte imprimé Auteurs : N. D. Polychronopoulos, Auteur ; J. Vlachopoulos, Auteur Année de publication : 2018 Article en page(s) : p. 662-668 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse des flux de matières et d'énergie Matières plastiques -- Extrusion Moffatt (Tourbillons de) Simulation par ordinateur Index. décimale : 668.4 Plastiques, vinyles Résumé : A 3D flow analysis package is used to simulate the flow phenomena in a short section of the metering zone of a single screw extruder. The assumption of stationary screw and rotating barrel is used. For sharp flight root corners, in addition to the primary flow field a secondary flow was determined in front of the root of the pushing flight and behind the root of the trailing flight, akin to what is known in the fluid mechanics literature as Moffatt eddies. Fluid particles caught in Moffatt eddy regions require travel times which are at least two orders of magnitude larger than the average residence time. This implies high probability of degradation and explains the deposits of thin carbonaceous films and gels, which have been discussed in several publications in the technical literature. The computer simulations show the existence of Moffatt eddies in the presence or absence of pressure gradients. When the screw roots have relatively wide angles no Moffatt eddies are predicted, in agreement with recommendations for good screw design practices. Note de contenu : - Problem formulation and solution procedure DOI : 10.3139/217.3574 En ligne : https://www.degruyter.com/document/doi/10.3139/217.3574/pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31405 [article]

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Design guidelines to balance the flow distribution in complex profile extrusion dies / A. Rajkumar in INTERNATIONAL POLYMER PROCESSING, Vol. XXXII, N° 1 (03/2017)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXII, N° 1 (03/2017) . - p. 28-71 Titre : Design guidelines to balance the flow distribution in complex profile extrusion dies Type de document : texte imprimé Auteurs : A. Rajkumar, Auteur ; L. L. Ferras, Auteur ; Olga. S. Carneiro, Auteur ; M. Becker, Auteur ; J. M. Nóbrega, Auteur Année de publication : 2017 Article en page(s) : p. 28-71 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse des flux de matières et d'énergie Analyse numérique Filières d'extrusion Homopolymères Polypropylène Profilés Rhéologie Simulation par ordinateur Index. décimale : 668.4 Plastiques, vinyles Résumé : In this work a novel methodology to balance the flow distribution in complex extrusion dies is proposed. For this purpose, the profile cross section geometry is divided into simpler geometries (L and T shaped profiles), which are balanced with a surrogate model obtained by a detailed numerical study. The numerical simulations are performed considering the non-isothermal flow of Bird-Carreau inelastic fluids, and the numerical computations are performed with a solver implemented in OpenFOAM computational library. The proposed methodology is assessed with some case studies. Note de contenu : - GEOMETRY - GOVERNING EQUATIONS AND NUMERICAL METHOD : Governing equations - Numerical method - SURROGATE FLOW BALANCE MODELS : Case studies - Results and discussion - DIE DESIGN METHODOLOGY : Average method (stages) - Minimum method (stages) - DIE DESIGN METHODOLOGY ASSESSMENT DOI : 10.3139/217.3272 En ligne : https://drive.google.com/file/d/1QRJwacCgyG3Nhdg4Wp_c0dYg4RMqElYM/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28002 [article]

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Heat flow analysis and efficiency optimization of rotational molding equipment for large plastic products / L. Qin in INTERNATIONAL POLYMER PROCESSING, Vol. XXX, N° 2 (05/2015)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXX, N° 2 (05/2015) . - p. 194-201 Titre : Heat flow analysis and efficiency optimization of rotational molding equipment for large plastic products Type de document : texte imprimé Auteurs : L. Qin, Auteur ; Y.-M. Ding, Auteur ; G.-C. Zhu, Auteur ; H.-C. Yu, Auteur ; W.-M. Wang, Auteur Année de publication : 2015 Article en page(s) : p. 194-201 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse des flux de matières et d'énergie Matières plastiques -- Rotomoulage -- Appareils et matériels Simulation par ordinateur Thermocinétique Index. décimale : 668.4 Plastiques, vinyles Résumé : There exists an important relationship between the temperature fields and the heat utilization efficiency in the oven of rotational molding equipment. If the temperatures at the main locations can be reasonably controlled, then the efficiency of the rotational molding machine can be effectively improved. The main objective of this research project is to carry out numerical simulation and analysis of the velocity field and temperature field in the oven of a shuttle-type rotational molding machine by using the commercial code FLUENT. The machine was selected as the research object owing to its uneven temperature fields and large energy wastage. The simulation results were then verified by experiments. By improving the structure of the outlets of rotational molding machine and by reasonably controlling the temperature distribution in the oven and die, the working temperature can quickly reach the maximum point, and the uniformity of the temperature in the working area can be ensured. The results showed that the molding efficiency and energy efficiency of the rotational molding machine can be improved by controlling the temperature distribution, thereby increasing the production efficiency of rotational molding. Note de contenu : - TEST METHOD AND TEST SCHEME : Numerical simulation of temperature field in oven - Oven structure improvement experiment - RESULTS AND DISCUSSION : Temperature characteristics of rotational molding process - Analysis of simulation results - EXPERIMENTAL RESULTS : Oven velocity field analysis - Oven temperature field analysis DOI : 10.3139/217.2926 En ligne : https://drive.google.com/file/d/1rvnAEOR7scM3k2lh52INH4VvgqMKbG7e/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23892 [article]

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How can we predict the evolution of recycling chains ? / Mauricio Dwek in MATERIAUX & TECHNIQUES, Vol. 103, N° 1 (2015)

[article]  inMATERIAUX & TECHNIQUES > Vol. 103, N° 1 (2015) . - 7 p. Titre : How can we predict the evolution of recycling chains ? Type de document : texte imprimé Auteurs : Mauricio Dwek, Auteur ; P. Zwolinski, Auteur Année de publication : 2015 Article en page(s) : 7 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse des flux de matières et d'énergie Durée de vie (Ingénierie) Eco-conception Recyclage (déchets, etc.) Index. décimale : 658.57 Recherche et développement : recherche fondamentale, nouveaux produits Résumé : Sustaining the material needs of society is an increasingly complex task, as demand grows for sophisticated materials. Concerns regarding material availability are rising, thus many studies following material stocks and flows in the economy and defining material criticality are being conducted. These assessments provide information that can be decisive for the industrial implementation of sustainable and innovative technologies. Disruption risks to the supply chains must be predicted to prevent material shortages at the corporate, national and global scale. Designers can play a major role for the preservation of material resources by considering the evolution of availability at the material selection stage. With the product lifecycle in mind, material recyclability will progressively become a key factor for the design process, in order to foresee potential vulnerabilities and foster material recycling. This paper is part of an on-going research being conducted at the G-SCOP lab of the Grenoble Institute of Technology, whose aim is to provide dynamic resource scenarios and additional input to Life Cycle Assessment (LCA) methods and Design for Recycling guidelines, so as to assist material selection in the design process. It presents a framework and the research methodology employed to identify the parameters that determine the evolution of recycling chains, based on material flow data and historical accounts of the shifts, ascent and decline of recycling activities. This should allow designers to incorporate material criticality and recyclability to their Life Cycle Assessments and fill an important gap since there are very few wide-ranging compilations of data describing the history of the recycling processes and industry in literature. Note de contenu : - THE IMPORTANCE OF MATERIAL SELECTION IN ECO-DESIGN : Addressing material availability in design - Material value considerations - Recycling issues - FRAMEWORK FOR STUDYING THE EVOLUTION OF REYCLING CHAINS : Scope delimitation - Material criticality - Material flows and productend-of-life - RESEARCH METHODOLOGY - FUTURE WORK Référence de l'article : 102 Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23768 [article]

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Material behavior in the plasticizing cylinder of an injection molding of the vent type / Y. Hisakura in INTERNATIONAL POLYMER PROCESSING, Vol. XXXIII, N° 5 (11/2018)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXIII, N° 5 (11/2018) . - p. 652-661 Titre : Material behavior in the plasticizing cylinder of an injection molding of the vent type Type de document : texte imprimé Auteurs : Y. Hisakura, Auteur ; I. Hisamitsu, Auteur ; M. Sugihara, Auteur ; S.-I. Tanifuji, Auteur ; H. Hamada, Auteur Année de publication : 2018 Article en page(s) : p. 652-661 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse des flux de matières et d'énergie Matières plastiques -- Moulage par injection Plastification Rhéologie Simulation par ordinateur Terpolymère acrylonitrile butadiène styrène Index. décimale : 668.4 Plastiques, vinyles Résumé : Thermoplastic injection molding is applied in a wide variety of products. It is known that volatile components generated when resin melts cause structural defects during the thermoplastic injection process. Not only that, the pre-injection preparation work including drying the material and maintaining the metal mold, have become standard procedures to prevent these defects, but these procedures deteriorate productivity. Vent-type injection molding involves the use of cylinders featuring a vent hole at the center of the plasticizing cylinder. Although it is a conventional molding method, there are many issues including resin leakage from a vent hole and difficulty of material replacements. These issues prevented it from widespread application. Moreover, the vent-type plasticization process has not been examined theoretically or systematically. In order to maximize and generalize functions of vent-type molding, it is necessary to clarify the flow behavior of resin in the vent cylinder. In this study, we verified the flow behavior of resin in the vent-type plasticization cylinder through experimentation and simulation. In the simulation, using the flow analysis method, the filling rate inside the screw was determined by the pressure distribution inside the screw. In the experiments, the molding condition that causes venting up was verified by changing the screw rotation rates and the supply amount of the resin, for determining the filling rate of resin inside the screw. The filling rates obtained through the simulation and the experiment are almost the same. The result suggests that this simulation is very effective for predicting the filling rate. Note de contenu : - THEORY - EXPERIMENTAL : Materials - Sample preparation - RESULTS AND DISCUSSION : Results of vent-up testing - Comparative analysis of test results DOI : 10.3139/217.3572 En ligne : https://www.degruyter.com/document/doi/10.3139/217.3572/pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31404 [article]

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Materials and energy flow in the life cycle of leather : a case study of Bangladesh / Zia Uddin Mohamed Chowdhury in MATERIAUX & TECHNIQUES, Vol. 105, N° 5/6 (2017)  

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MFA vs. LCA, particularly as environment management methods in industry : an opinion / Jean-Pierre Birat in MATERIAUX & TECHNIQUES, Vol. 108, N° 5-6 (2020)  

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Numerical investigation of effect of rotor phase angle in partially-filled rubber mixing / S. R. Das in INTERNATIONAL POLYMER PROCESSING, Vol. XXXII, N° 3 (07/2017)  

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Systematic analysis of material fluxes at tanneries / C. Konrad in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 86, N° 1 (01-02/2002)  

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