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The role of nanoclay partitioning and fibril formation on dyeability of blend nanocomposite fibres / Ahmad Bigdeli in COLORATION TECHNOLOGY, Vol. 129, N° 4 (08/2013)
[article]
Titre : The role of nanoclay partitioning and fibril formation on dyeability of blend nanocomposite fibres Type de document : texte imprimé Auteurs : Ahmad Bigdeli, Auteur ; Hossein Nazockdast, Auteur ; Abosaeed Rashidi, Auteur ; Mohammad Esmail Yazdanshenas, Auteur Année de publication : 2013 Article en page(s) : p. 289–297 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Argile
Composites
Compoundage
Extrudeuse bi-vis
Extrusion filage
Fibrillation
Matériaux hybrides
Microscopie électronique à balayage
Microscopie électronique en transmission
Nanoparticules
Polybutylène téréphtalate
Polypropylène
Rhéologie
Teinture -- Fibres textiles synthétiquesIndex. décimale : 667.3 Teinture et impression des tissus Résumé : The aim of the present work was to study the effect of microstructure and microfibril formation on dyeability of polypropylene/poly(butylene terephthalate)/organoclay blend nanocomposite fibres. The blend nanocomposite samples with the same blend ratio but varying in organoclay content were prepared via melt compounding by using a co-rotating twin screw extruder. The microfibrillar morphology and nanoclay partitioning were studied using scanning electron microscopy and transmission electron microscopy together with rheological results. The presence of nanoclay in the form of tactoids in the polypropylene matrix accelerated the dye sorption but much greater ultimate dye uptake could be achieved for the sample in which the major part of the platelets were preferentially located inside the poly(butylene terephthalate) fibrils. Although increasing the organoclay concentration increased the ultimate dye uptake, it limited the fibril formation at higher organoclay concentration. The utilisation of a compatibiliser was found to have an enhancing effect on ultimate dye uptake. This could be explained in terms of the interfacial role of the compatibiliser in improving microfibril formation as well as partitioning a fraction of nanoclay platelets inside the polypropylene matrix. DOI : 10.1111/cote.12038 En ligne : http://onlinelibrary.wiley.com/doi/10.1111/cote.12038/pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19042
in COLORATION TECHNOLOGY > Vol. 129, N° 4 (08/2013) . - p. 289–297[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 15394 - Périodique Bibliothèque principale Documentaires Disponible The torque of the twin screw / Peter von Hoffmann in KUNSTSTOFFE INTERNATIONAL, Vol. 101, N° 9 (09/2011)
[article]
Titre : The torque of the twin screw Type de document : texte imprimé Auteurs : Peter von Hoffmann, Auteur ; Frank Lechner, Auteur Année de publication : 2011 Article en page(s) : p. 35-38 Langues : Anglais (eng) Catégories : Extrudeuse bi-vis
Matières plastiques -- Extrusion
ProductivitéIndex. décimale : 668.4 Plastiques, vinyles Résumé : Compounding - The ZSK MC18intermeshing, co-rotating twin screw extruder boasts the highest specific torque rating currently available on the market, enabling as much as a 30 % increase in throughput. This means greater productivity and a further improvement in compound quality – not to mention great flexibility for all types of use. Note de contenu : - Fast return on investment
- The improvements in detail
- Improved compound quality and increased output
- Peripheral equipment for increasing performance
- Rapid market acceptancePermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15023
in KUNSTSTOFFE INTERNATIONAL > Vol. 101, N° 9 (09/2011) . - p. 35-38[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 13328 - Périodique Bibliothèque principale Documentaires Disponible The turn of the screw / Michael Dillon in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 192, N° 4450 (03/2002)
[article]
Titre : The turn of the screw Type de document : texte imprimé Auteurs : Michael Dillon, Auteur Année de publication : 2002 Article en page(s) : p. 14-18 Langues : Anglais (eng) Catégories : Extrudeuse bi-vis
Mélange
Revêtements poudre:Peinture poudreIndex. décimale : 667.9 Revêtements et enduits Résumé : The author looks at advances in twin screw extruders for powder coating applications.
Powder coatings have become widely established because of their ease of use without the need for solvents, together with high physical strength and a range of finishes. Formulations based on premixes of epoxy, polyester, acrylic and polyurethane thermosetting resins are compounded with a variety of pigments, fillers, curing agents, flow modifiers and so on to suit specific end-use requirements. During the compounding process, the resin is melted and the ingredients are mixed uniformly to produce a homogenous melt, which is subsequently cooled and flaked before grinding into a fine powder and classifying. The compounding process is well suited to the operating and mixing behaviour of the corotating twin screw extruder.Note de contenu : - Factors influencing mixing
- Extruder developments
- Laboratory extruders
- Drive power
- Barrel design
- Powder intake
- Reprocessing fines
- High screw speed
- Process stability
- FIGURES : 1. Extruder layout using starve feeding - 2. Effect of high capacity intake feed screws - 3. Key stages in the output enhancement of the APV MP-PC extruder - 4. Torque variation during starve feeding - 5. Extruder layout using side feedingPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28094
in POLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 192, N° 4450 (03/2002) . - p. 14-18[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 000327 - Périodique Bibliothèque principale Documentaires Disponible Three-dimensional finite element solution of the flow in single and twin-screw extruders / F. Ilinca in INTERNATIONAL POLYMER PROCESSING, Vol. XXV, N° 4 (09/2010)
[article]
Titre : Three-dimensional finite element solution of the flow in single and twin-screw extruders Type de document : texte imprimé Auteurs : F. Ilinca, Auteur ; J.-F. Hétu, Auteur Année de publication : 2010 Article en page(s) : p. 275-286 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Ecoulement tridimensionnel
Eléments finis, Méthode des
Extrudeuse bi-vis
Imagerie tridimensionnelleIndex. décimale : 668.9 Polymères Résumé : This work is aimed at the numerical modeling of the flow inside single and twin-screw extruders. Numerical solutions are obtained using a recently developed immersed boundary finite element method capable of solving the flow in the presence of complex non-stationary solid boundaries. The method is first validated against the solution obtained on a body-conforming grid for a single screw extruder and then applied to a twin-screw mixer. The time dependent single screw problem can also be solved in a rotating reference frame for which a steady state solution can be obtained. This allows the evaluation of time integration errors of the moving immersed interface algorithm. For instance the flow is considered isothermal and the material behaves as a Generalized Newtonian fluid. Because the viscosity depends on the shear rate, solutions will be shown for various rotation velocities of the screw and compared with solutions obtained on body-conforming grids. The method is shown to give very accurate results and can be used for a more in-depth investigation of the material behavior in extruders. DOI : 10.3139/217.2351 En ligne : https://drive.google.com/file/d/1iWUIP-2Z-d0vIVBdf6d6wmacgaM4k19P/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9824
in INTERNATIONAL POLYMER PROCESSING > Vol. XXV, N° 4 (09/2010) . - p. 275-286[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 012380 - Périodique Bibliothèque principale Documentaires Disponible Three-dimensional numerical study of the mixing behaviour of twin-screw elements / F. Ilinca in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 1 (03/2012)
[article]
Titre : Three-dimensional numerical study of the mixing behaviour of twin-screw elements Type de document : texte imprimé Auteurs : F. Ilinca, Auteur ; J.-F. Hétu, Auteur Année de publication : 2012 Article en page(s) : p. 111-120 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Extrudeuse bi-vis
Fluides, Mécanique des
Mélange
Modélisation tridimensionnelleIndex. décimale : 668.9 Polymères Résumé : In this work the numerical modeling of the flow inside co-rotating twin-screw extruders is performed and solutions are analyzed to determine the mixing behavior of two screw elements: conveying and mixing elements. The flow around intermeshing screws is computed using an immersed boundary finite element method capable of dealing with complex moving solid boundaries. The flow is considered isothermal and the material behaves as a generalized non-Newtonian fluid. Because the viscosity depends on the shear rate, solutions will be shown for various rotation velocities of the screw. The 3D solutions are then analyzed in order to determine various parameters characterizing the flow mixing such as the residence time and the linear stretch. Residence time distribution inside the twin-screw extruder is first computed by using a particle tracking algorithm based on a fourth order Runge-Kutta method. A large number of particles are tracked inside the extruder and the resulting particle data is used to determine the distribution of the residence time and of the linear stretch. The spatial distribution of the residence time is also computed by solving a transport equation tracking the injection time of the polymer melt. The methodology shows important differences in the mixing behavior of the screw elements considered. Note de contenu : - NUMERICAL MODELING OF THE FLOW : Boundary conditions - The finite element formulation - The immersed boundary method
- STUDY OF THE MIXING BEHAVIOR : Residence time - Length
- NUMERICAL APPLICATIONS : Flow solution - Mixing behavior of screw elementsDOI : 10.3139/217.2450 En ligne : https://drive.google.com/file/d/1mAHTRYAsO49yeN1FgA4_JRjx9tqb2bfu/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13740
in INTERNATIONAL POLYMER PROCESSING > Vol. XXVII, N° 1 (03/2012) . - p. 111-120[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 13722 - Périodique Bibliothèque principale Documentaires Disponible Triangle rule for operating windows and scale-up criteria for volume resistivity of PP/carbon nanotubes composites / W. Polrut in INTERNATIONAL POLYMER PROCESSING, Vol. XXVI, N° 4 (09/2011)
PermalinkTwin-screw extruders : a basic understanding / Fabrizio G. Martelli / New York [USA] : Van Nostrand Reinhold Company (1983)
PermalinkWear protection on twin screws / Hans-Peter Schneider in KUNSTSTOFFE INTERNATIONAL, Vol. 103, N° 4 (04/2013)
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