Lower temperature plasticizing and extrusion of polymer in spherical screw extruder under vibration force field / G. Zheng in INTERNATIONAL POLYMER PROCESSING, Vol. XXVI, N° 1 (03/2011)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVI, N° 1 (03/2011) . - p. 40-47 Titre : Lower temperature plasticizing and extrusion of polymer in spherical screw extruder under vibration force field Type de document : texte imprimé Auteurs : G. Zheng, Auteur ; C. Xu, Auteur ; Y. Liu, Auteur ; J. Qu, Auteur ; T. Jiang, Auteur Année de publication : 2011 Article en page(s) : p. 40-47 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Énergie -- Consommation Matières plastiques -- Extrusion Matières plastiques -- Moulage Ondes électromagnétiques Plastification Polyéthylène haute densité Vis d'extrusion simple Index. décimale : 668.9 Polymères Résumé : Physical and mathematical model for polymer plasticizing in proposed electromagnetic dynamic spherical screw extruder were developed to explore polymer plasticizing and molding mechanism at lower temperature under vibration force field. Polymer plasticizing mechanism was studied by deriving the mathematical expressions of energy consumed and the polymer flow. The energy consumed in polymer plasticizing was depicted in terms of vibrating dissipation, polymer deformation, shear and friction energy. LDPE was used as an objective material and extruded by the extruder with the electromagnetic excitation and spherical screw. The experimental results show the good agreement with theoretical calculations. Both of them show that: Polymer processing temperature and energy consumption decrease significantly while the plasticizing rate is increased over 60% by introducing the vibration force field. The research offers experimental and theoretical references as well as the evaluation method for optimizing the polymer processing parameters and designing the vibration induced equipment. DOI : 10.3139/217.2372 En ligne : https://drive.google.com/file/d/1VYVOi19pybPDfjlHp7Qw6UPbCB6QCwtE/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10981 [article]

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Rheological properties of neat and calcium carbonate particles filled polypropylene blends under axial vibration force field / Y. Liu in INTERNATIONAL POLYMER PROCESSING, Vol. XXVI, N° 1 (03/2011)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVI, N° 1 (03/2011) . - p. 56-62 Titre : Rheological properties of neat and calcium carbonate particles filled polypropylene blends under axial vibration force field Type de document : texte imprimé Auteurs : Y. Liu, Auteur ; T. Jiang, Auteur ; G. Zeng, Auteur ; Y. Huang, Auteur ; X. Li, Auteur Année de publication : 2011 Article en page(s) : p. 56-62 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Carbonate de calcium Le carbonate de calcium (CaCO3) est composé d'un ion carbonate (CO32-) et d'un ion calcium (Ca2+), sa masse molaire est de 100,1 g/mole. C'est le composant principal du calcaire et de la craie, mais également du marbre. C'est aussi le principal constituant des coquilles d'animaux marins, du corail et des escargots. Ecoulement cisaillé Polypropylène Rhéologie Rhéomètres Viscosité Index. décimale : 668.9 Polymères Résumé : Structures, working mechanism, data collecting and processing methods of the self-made multifunctional all-electronic rheometer for polymer composites were introduced in detail. The validity of this equipment was proved by deriving the apparent shear viscosity expression under axial vibration condition and comparing the results obtained from both this selfmade rheometer and Rosand Rh7D capillary rheometer at steady state. With this equipment, the effects of calcium carbonate weight fraction, particle size and vibration parameters on apparent shear viscosity of calcium carbonate filled propylene composites were investigated. The results show that: the apparent shear viscosity of the composites increases with the filled particle concentration. However, it is seldom affected by particle size within certain a range of shear rate. While the apparent shear viscosity increases with the decrease of particle size at moderate shear rate. Besides, the apparent shear viscosity declines rapidly with the increasing vibration amplitude. However it exhibits a cosinoidal or sinusoidal trend as vibration frequency increases and peaks at the resonant frequency of the composites. DOI : 10.3139/217.2392 En ligne : https://drive.google.com/file/d/1uRl0Mo44JXinlpMQUvwhiY8RIdKQcH75/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11043 [article]

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