Dynamic analysis of melting in injection extruder / K. L. Yung in INTERNATIONAL POLYMER PROCESSING, Vol. XV, N° 3 (09/2000)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XV, N° 3 (09/2000) . - p. 255-259 Titre : Dynamic analysis of melting in injection extruder Type de document : texte imprimé Auteurs : K. L. Yung, Auteur ; Y. Xu, Auteur ; F. Lau, Auteur Année de publication : 2000 Article en page(s) : p. 255-259 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Melting is one of the most important process in plastics processing. Admit the extensive use of plastic injection moulding machine in industry, most studies were on extruders which were simpler to model. This paper studies the melting process and derives its transient (dynamic) model for predicting the characteristics of melting in feeding stage of injection extruder. Based on this transient model, factors affecting the melting speed in injection extruders are exposed. Simulation results agree with the results from experiments. Note de contenu : - Heat transfer from heater to inner side of barrel - Heat transfer in melting film - Transient melting model - Simulation and further discussions DOI : 10.3139/217.1605 En ligne : https://drive.google.com/file/d/1yjOdGDdLZ-3nn_t9BRfWSdghREFwqKna/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15829 [article]

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A new method for simulating the conveying of solid pellets / K. L. Yung in INTERNATIONAL POLYMER PROCESSING, Vol. XVII, N° 2 (06/2002)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XVII, N° 2 (06/2002) . - p. 91-94 Titre : A new method for simulating the conveying of solid pellets Type de document : texte imprimé Auteurs : K. L. Yung, Auteur ; Y. Xue, Auteur ; K. H. Lau, Auteur Année de publication : 2002 Article en page(s) : p. 91-94 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : A new method for simulating the solid conveying process in plasticating machine is proposed in this paper. The new simulation method is superior to previous ones by having the ability in modeling the movements, in any direction, of solid pellets of any geometry or whether it is densely or sparsely packed. New normal and tangential contact force models are introduced. With the new method the solid conveying process are simulated more realistically. In the simulation, the effects of velocity of the barrel, the sliding frictions of the pellets against the barrel and the screw walls with respect to the solid conveying speed are studied, which coincide with empirical results Note de contenu : - SIMULATION METHOD - CONTACT FORCE MODELS - CONTACT IDENTIFICATIONS DOI : 10.3139/217.1689 En ligne : https://drive.google.com/file/d/17GNRn6zQ2UHF7NAm8G5mE1RUkGljzyz4/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15927 [article]

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A transient melting model of polymer balls sliding against the barrel / K. L. Yung in INTERNATIONAL POLYMER PROCESSING, Vol. XVI, N° 2 (06/2001)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XVI, N° 2 (06/2001) . - p. 108-112 Titre : A transient melting model of polymer balls sliding against the barrel Type de document : texte imprimé Auteurs : K. L. Yung, Auteur ; Y. Xu, Auteur ; K. H. Lau, Auteur Année de publication : 2001 Article en page(s) : p. 108-112 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : In the study of solid conveying process in plastics screw extrusion, a particle element numerical method enables us to simulate behavior of each solid particle during the process and takes into consideration the parameters of individual particle in the calculation. The melting of pellets in the solid conveying section is caused predominantly by heat from both friction and conduction through close contact. Experiments showed, melting happened before the solid plug was formed. Hence, when a particle element numerical method is used to simulate the conveying and melting process in the injection bellow, the analysis of melting process caused by solid particles sliding against wall of bellow should be included. Searching through the recent literature, no valid analysis of the transient close-contact melting process caused by viscous dissipation was found. This paper attempts to present an analysis of the melting process and derive an expression for describing the transient melting caused by both friction and close-contact heating. The melting model of polymer pellets sliding against the barrel was achieved by assuming the friction against the barrel as friction against an isothermal wall given the high heat conductivity of the barrel. To keep the expression simple, a constant temperature boundary condition is utilized for the wall which concurs with reality. DOI : 10.3139/217.1630 En ligne : https://drive.google.com/file/d/14ha-riWCPrWoijbglIUeV5F7_CQR9Tac/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15890 [article]

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