Modeling of melt conveying in a novel screw-nested extruder / M. Y. Jia in INTERNATIONAL POLYMER PROCESSING, Vol. XXIV, N° 2 (05/2009)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXIV, N° 2 (05/2009) . - p. 199-205 Titre : Modeling of melt conveying in a novel screw-nested extruder Type de document : texte imprimé Auteurs : M. Y. Jia, Auteur ; Jibin Yu, Auteur ; P. Xue, Auteur ; Z. X. Guo, Auteur Année de publication : 2009 Article en page(s) : p. 199-205 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : A novel screw-nested extruder is fabricated, which consists of double extrusion systems. The inner screw couples with one inner barrel, whose outer configuration acts as the screw for the outer barrel. The nested screw extrusion systems can co-extrude when the inner barrel/outer screw rotates. Each extrusion system can also work independently as one general extruder. A new mathematical model of an isothermal Newtonian flow is developed to describe the melt flow in the extruder. The analytical solutions of flow rate are well in agreement with the Campbell's experimental data for screw drag flow, screw flight displacement flow and barrel drag flow when the boundary conditions are obtained for the special cases in which the screw core, screw flight and the barrel rotate independently or in pairs. This can not be explained by conventional parallel-plate models. Further, the model is also well used to analyze the melt flow in the inner extrusion system of the novel nested screw extruder. DOI : 10.3139/217.2234 En ligne : https://drive.google.com/file/d/1_mJ5OFjAQePJkLeXDsEdG8gA-f8YiACn/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5252 [article]

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Studies on the effect of pellet size on positive conveying in helically grooved single screw extruders / M. Y. Jia in INTERNATIONAL POLYMER PROCESSING, Vol. XXVIII, N° 3 (07/2013)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVIII, N° 3 (07/2013) . - p. 267-273 Titre : Studies on the effect of pellet size on positive conveying in helically grooved single screw extruders Type de document : texte imprimé Auteurs : M. Y. Jia, Auteur ; L. Pan, Auteur ; P. Xue, Auteur ; K.-J. Wang, Auteur ; X.-M. Jin, Auteur Année de publication : 2013 Article en page(s) : p. 267-273 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cisaillement (mécanique) Extrudeuse monovis Granulats Polyéthylène basse densité Transport Index. décimale : 668.4 Plastiques, vinyles Résumé : The helical grooved barrel feed section permits, when the barrel channel aspect ratio and the barrel channel helical angle are properly designed, an operating mode where the positive conveying is prevailing. While the pellet size of materials is varied, different dimension relationships of the barrel channel depth and pellet size could induce different equivalent barrel channel aspect ratios with the transformation of solids conveying mechanisms from the positive conveying to the frictiondrag conveying. Considering the effect of dimension relationships on the solids conveying mechanism, a novel pelletsize physical model was established to guide the available design of the barrel channel geometry for positive conveying. In the pellet-size model, one or two shear interfaces were identified inside the solid-plug resulting in different equivalent barrel channel aspect ratios, based on which the solids conveying mechanism on the shear interfaces was detailed by the boundary condition equations for positive conveying. Besides, the theoretical simulations are also compared with the on-line measuring experimental data. The results show that the equivalent barrel channel aspect ratio on the shear interfaces exists indeed and determines the solids conveying mechanism, which is well confirmed by the excellent consistence between the predicted and measured data. DOI : 10.3139/217.2709 En ligne : https://drive.google.com/file/d/1NM3iQMBoXVnj3a4qcCi3HxnFnjaTp99O/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19015 [article]

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