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A 3D simulation analysis of reactive flow in screw elements of closely intermeshing twin screw extruders / Ederley Ortiz-Rodriguez in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 4 (08/2012)
[article]
Titre : A 3D simulation analysis of reactive flow in screw elements of closely intermeshing twin screw extruders : Scale-up calculations Type de document : texte imprimé Auteurs : Ederley Ortiz-Rodriguez, Auteur ; C. Tzoganakis, Auteur Année de publication : 2012 Article en page(s) : p. 442-451 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Ecoulement permanent
Extrudeuse bi-vis
Modélisation tridimensionnelle
Peroxydes
Polypropylène
Rhéologie
Simulation par ordinateurIndex. décimale : 668.9 Polymères Résumé : The peroxide-initiated degradation of polypropylene in conventional screw elements of closely intermeshing twin-screw extruders is analyzed by means of a three-dimensional (3D) simulation approach. The 3D simulations of the reacting flow are implemented under the assumption of steady-state flow conditions, and scale-up considerations are addressed by simulating screw elements of two different size extruders. The effects of the initial peroxide concentration and reference mass throughputs on processing parameters are analyzed in terms of the specified extruder size. In this study, the scaled-up mass throughput is determined under the assumption of constant residence time. For the implemented processing conditions, the final values of the weigh-average molecular weight (Mw) and polidispersity index (PDI) for both the reference and scaled-up screw elements are similar when the flow rate is close to that corresponding to the maximum conveying capacity of the screw elements. For more restricted flow conditions, however, lower values of both the Mw and PDI are obtained for the larger screw element. Additionally, a previously proposed scale-up procedure from one-dimensional (1D) simulations is evaluated by means of a 3D simulation analysis. The results of this evaluation show a good agreement between the trend of the 3D and 1D simulation results. Note de contenu : - Modeling considerations
- Set up of the simulations and processing conditions
- Discussion and results : Genral scale-up calculation analysis - Thermal time analysisDOI : 10.3139/217.2568 Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15767
in INTERNATIONAL POLYMER PROCESSING > Vol. XXVII, N° 4 (08/2012) . - p. 442-451[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 14087 - Périodique Bibliothèque principale Documentaires Disponible Abnormal behaviors in the capillary rheometry of plastisol formulations / Y. Demay in INTERNATIONAL POLYMER PROCESSING, Vol. XXXIII, N° 3 (07/2018)
[article]
Titre : Abnormal behaviors in the capillary rheometry of plastisol formulations Type de document : texte imprimé Auteurs : Y. Demay, Auteur ; Y. Abdesselam, Auteur ; Jean-François Agassant Année de publication : 2018 Article en page(s) : p. 363-370 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse numérique
Bagley, Correction de
Chlorure de polyvinyle
Ecoulement laminaire
Formulation (Génie chimique)
Modèles mathématiques
Revêtements de sols
RhéologieIndex. décimale : 668.4 Plastiques, vinyles Résumé : The rheology of plastisol formulations for flooring applications using knife-over-roll coating process is studied using both Couette and capillary rheometers. The behavior is similar in many aspects to the rheology of suspensions: Shear thinning behavior at low shear rate, then a Newtonian plateau at intermediate shear rates followed by a dilatancy peak. However several abnormal phenomena may be observed in capillary experiments. At very high shear rates, a second shear thinning behavior is observed which depends on the flow geometry. Due to the non-monotonous behavior of the plastisol viscosity, this is analysed using a dedicated numerical method. An apparent slip velocity has been determined. Otherwise capillary experiments point out the existence of important entrance pressure loss. These measures are interpreted using a modified Cogswell method as an important elongationnal viscosity, around hundred times the shear viscosity. Note de contenu : - CAPILLARY RHEOLOGY OF PLASTISOL FORMULATIONS : Rheology measurements protocol - Plastisol formulations - Bagley corrections - Influence of the capillary diameter - Numerical investigation of the flow curves - Poiseuille flow modelling for a non-monotonous viscous behaviour
- RESULTS : Analysis as an apparent slip velocity for the small capillary diameter - Analysis of entrance pressure dropDOI : 10.3139/217.3554 Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30805
in INTERNATIONAL POLYMER PROCESSING > Vol. XXXIII, N° 3 (07/2018) . - p. 363-370[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 20044 - Périodique Bibliothèque principale Documentaires Disponible Accurate simulation of the four modes of post-die extrudate shape distortion / M. Gupta in INTERNATIONAL POLYMER PROCESSING, Vol. 36, N° 1 (2021)
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[article]
Titre : Accurate simulation of the four modes of post-die extrudate shape distortion Type de document : texte imprimé Auteurs : M. Gupta, Auteur Année de publication : 2021 Article en page(s) : p. 69-78 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chlorure de polyvinyle
Filières d'extrusion
Fluides, Mécanique des
Matières plastiques -- Extrusion
Rhéologie
Simulation par ordinateur
Terpolymère acrylonitrile butadiène styrèneIndex. décimale : 668.4 Plastiques, vinyles Résumé : A combined flow, thermal and structural analysis is employed to simulate post-die extrudate distortion in different profile dies. All four factors which can cause extrudate distortion, namely, non uniform exit velocity distribution, extrudate shrinkage, extrudate draw down, and deformed shape of the calibrator or sizer profile, are simulated. To analyze the effect of exit velocity variation on extrudate distortion, the parameterized geometry of a simple profile die is optimized using an extrusion die optimization software. The simulation results presented for a bi-layer profile die successfully demonstrate how gradually changing profile shape in successive calibrators/sizers can be used to simplify the die design for extrusion of complex profiles. The predicted extrudate shape and layer structure for the bi-layer die are found to accurately match with those in the extruded product. Note de contenu : - INTRODUCTION : Non-uniform exit velocity - Cooling shrinkage - Extrudate draw down - Calibrator or sizer profile
- GOVERNING EQUATIONS : Fluid flow and structural mechanics equations - Extrusion die optimization
- MATERIAL PROPERTIES
- RESULTS AND DISCUSSION : Effect of velocity distribution at die exit
on extrusion distortion - Effect of cooling shrinkage on extrusion distortion - Effect of post-die draw down on extrudate distortion - Effect of calibrator or sizer profile on extrudate distortion
- Table 1 : Properties of ABS and PVC used in this workDOI : https://doi.org/10.1515/ipp-2020-3995 En ligne : https://drive.google.com/file/d/1qY_XNA26AXe00d8KSO7vnQzaDLURTLLl/view?usp=shari [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36352
in INTERNATIONAL POLYMER PROCESSING > Vol. 36, N° 1 (2021) . - p. 69-78[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 23731 - Périodique Bibliothèque principale Documentaires Disponible ACOMP monitors 2-ethylhexyl acrylate and its comonomer-based reactions in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 208, N° 4647 (12/2018)
[article]
Titre : ACOMP monitors 2-ethylhexyl acrylate and its comonomer-based reactions Type de document : texte imprimé Année de publication : 2018 Article en page(s) : p. 32-35 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : 2-Ethylhexyl acrylate
Adhésifs sensibles à la pression
Chromatographie sur gel
Copolymères -- Synthèse
Homopolymères
Polymérisation
RhéologieIndex. décimale : 668.3 Adhésifs et produits semblables Résumé : The author discusses the rol of its ACOMP online monitoring system in monitoring the polymerisation of two pressure sensitive adhesives. Note de contenu : - Understanding the optical properties of monomers and polymers
- ACOMP configured to monitor the synthesis of poly2EHA and poly2EHA-AA
- Reaction methodology
- Acomp yields real-time results on the polymerisation of 2-ethylhexyl acrylate
- GPC characterisation
- Fig. 1 : ACM RI data for 2EHA monomer and poly2EHA
- Fig. 2 : UV spectra of 2EHA, acrylic acid and poly2EHA
- Fig. 3 : Raw UV, viscosity and SLS signals of homopolymer 2EHA batch polymerisation
- Fig. 4 : Raw UV, viscosity, and SLS data from copolymer 2EHA and AA batch polymerisation
- Fig. 5 : Polymer concentration at UV detector
- Fig. 6-7 : Intrinsic viscosity vs polymer concentration
- Fig. 8 : GPC analysis
- Fig. 9 : GPC analysis continued
- Table 1 : Reaction conditions for each polymerisation
- Table 2 : ACOMP monitored results of intrinsic viscosity and molecular weight
- Table 3 : GPC analysis resultsPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31517
in POLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 208, N° 4647 (12/2018) . - p. 32-35[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 20463 - Périodique Bibliothèque principale Documentaires Disponible
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Titre : Acrylic powder coatings Type de document : texte imprimé Auteurs : S. G. Yeates, Auteur ; T. Annable, Auteur ; B. J. Denton, Auteur ; G. Ellis, Auteur ; R. Nazir, Auteur ; D. W. Cornwell, Auteur Année de publication : 1995 Article en page(s) : p. 422-425 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Liants
Polyacryliques
Réticulation (polymérisation)
Revêtement poudre -- Additifs:Peinture poudre -- Additifs
Revêtements organiques
Revêtements poudre:Peinture poudre
Rhéologie
ViscositéIndex. décimale : 667.9 Revêtements et enduits Résumé : This paper describes the use of dynamic melt rhology in powder coatings designe, focusing on the ability of this technique to describe and predict coating performance in readily quantifiable rheology terms. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17000
in SURFACE COATINGS INTERNATIONAL > Vol. 78, N° 10 (10/1995) . - p. 422-425[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 006566 - Périodique Bibliothèque principale Documentaires Disponible Adding functionality to hot-Melt adhesives / Peter Kaali in ADHESIVES & SEALANTS INDUSTRY (ASI), Vol. 24, N° 3 (03/2017)
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PermalinkAdding future - 100% solid NiSAT-based rheology for sustainable manufacturing of architectural paints in SURFACE COATINGS INTERNATIONAL, Vol. 106.4 (07-08/2023)
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PermalinkAdditive boosts organosilicate paints / Carsten Schaefer in EUROPEAN COATINGS JOURNAL (ECJ), N° 5 (05/2019)
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PermalinkAdditive value in rheological control / Y. Trang in SURFACE COATINGS INTERNATIONAL, Vol. 95, 1 (02/2012)
PermalinkAdditives for powder coatings / Robertino Chinellato in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 211, N° 4669 (06/2021)
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PermalinkAdditives to control the rheology of paints and coatings / Leo J. Procopio in COATINGS TECH, Vol. 18, N° 10 (10/2021)
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PermalinkAdhesive properties : effects on selection of metering pumps / Paul Dreier in ADHESIVES AGE, Vol. 39, N° 7 (06/1996)
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PermalinkAdjusting UV-assisted rheology / Tobias Sommer in EUROPEAN COATINGS JOURNAL (ECJ), N° 7-8 (07-08/2022)
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PermalinkAdsorption in latex paints in relation to some of the properties of the mill base and the final coating / Margareta Huldén in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 66, N° 836 (09/1994)
PermalinkAdsorption d'ions divalents à la surface de particules chargées : Modélisation des liens microstrucutre - propriétés rhéométriques / S. Ducerf in LES CAHIERS DE RHEOLOGIE, Vol. XV, N° 1 (10/1996)
PermalinkAdvanced adsorption for actives application / Lorna M. Kessel in SOFW JOURNAL, Vol. 133, N° 4 (04/2007)
PermalinkAdvances in the science and technology of paints, inks and related coatings : 2005 / I. Holme in SURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS, Vol. 88, B4 (12/2005)
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PermalinkAdvances in waterborne rheology modifiers / Mihai Polverejan in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 204, N° 4592 (01/2014)
PermalinkAdvances polyurethane resin for wind turbine blades / Gu Yongming in JEC COMPOSITES MAGAZINE, N° 134 (05-06/2020)
PermalinkAgents de rhéologie : une aide à la formulation / Caroline Chavigny in PARFUMS COSMETIQUES ACTUALITES, N° 161 (11/2001)
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