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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Model and numerical simulation for the second penetration in water-assisted injection molding / S. Zhang in INTERNATIONAL POLYMER PROCESSING, Vol. XXVI, N° 5 (11/2011)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVI, N° 5 (11/2011) . - p. 560-568 Titre : Model and numerical simulation for the second penetration in water-assisted injection molding Type de document : texte imprimé Auteurs : S. Zhang, Auteur ; W. Cao, Auteur ; G. Zheng, Auteur ; Z. Jia, Auteur ; C. Chen, Auteur Année de publication : 2011 Article en page(s) : p. 560-568 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Eléments finis, Méthode des Matières plastiques -- Moulage par injection Matières plastiques -- Moulage par injection assistée par eau Modèles mathématiques Simulation par ordinateur Index. décimale : 668.4 Plastiques, vinyles Résumé : Unlike gas-assisted injection molding, subsequent penetration occurs on the radial direction after water displacing polymer melt in cavity due to the incompressibility and fast cooling of water in water-assisted injection molding. To simulate this second penetration, a dimensionless method was employed to simplify the governing equations for melt flow. Based on the reduced model, a formula was derived via mathematical inference to calculate the second penetration velocity and distance. In order to catch the huge temperature gradient at water-polymer interface, both polymer and water thermal conduct problems were founded and coupled at the interface. The finite element method was employed to solve the melt flow problem, and the finite difference method was used to discretize the energy equation. To verify the validity of the proposed model and algorithm, experiments were performed to measure the displacement of the water – melt interface for various melt temperatures and water pressures. The experimental results indicate that the primary penetration theory is not accurately on predicting residual wall thickness, whereas the combined primary and second penetration method significantly improve the accuracy. DOI : 10.3139/217.2491 En ligne : https://drive.google.com/file/d/1rSK7O29zgm9EP93IdcAUC-0sXoUKm_gv/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12478 [article]

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