Melting quality of polymers in internal mixer diagnosed by ultrasound / C.-C. Cheng in INTERNATIONAL POLYMER PROCESSING, Vol. XXIV, N° 5 (11/2009)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXIV, N° 5 (11/2009) . - p. 375-383 Titre : Melting quality of polymers in internal mixer diagnosed by ultrasound Type de document : texte imprimé Auteurs : C.-C. Cheng, Auteur ; H. Banakar, Auteur ; B.-T. Ooi, Auteur ; C.-K. Jen, Auteur Année de publication : 2009 Article en page(s) : p. 375-383 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Real-time, non-intrusive and non-destructive ultrasonic technology has been used to monitor the melting process in an internal mixer. Visual observation, mechanical torque measurement, and ultrasonic signatures, such as amplitude and time delay of transmission and reflection echoes were used for the diagnosis of the melting process of low density polyethylene (LDPE). Phenomena during the melting process, including phase change from solid to melt, partially melted pellets, air bubbles inside the melt, were successfully monitored by ultrasound. The ultrasonic signatures were able to determine when the polymer has melted completely. The method of moving standard deviation (MSD) was applied to establish the melting completion timing accurately. Higher temperature of mixing chamber and faster rotation speed of blades reduced melting completion period, indicated by MSD of ultrasonic signatures. The presented ultrasonic technique can be utilized to optimize the melting process. DOI : 10.3139/217.2166 En ligne : https://drive.google.com/file/d/1wE_5hk4l3O_b2sYrVUfvo9hgKS1cKD56/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6360 [article]

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Real-time diagnosis of micro powder injection molding using integrated ultrasonic sensors / C.-C. Cheng in INTERNATIONAL POLYMER PROCESSING, Vol. XXII, N° 2 (05/2007)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXII, N° 2 (05/2007) . - p. 140-145 Titre : Real-time diagnosis of micro powder injection molding using integrated ultrasonic sensors Type de document : texte imprimé Auteurs : C.-C. Cheng, Auteur ; Y. Ono, Auteur ; B. D. Whiteside, Auteur ; E. C. Brown, Auteur ; C.-K. Jen, Auteur ; P. D. Coates, Auteur Année de publication : 2007 Article en page(s) : p. 140-145 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Real-time Diagnosis of Micro Powder Injection Molding Using Integrated Ultrasonic Sensors Real-time diagnostics of ceramic powder injection molding using a commercial micromolding machine was performed using ultrasound. Miniature ultrasonic sensors were integrated onto the mold insert. Melt front, solidification, temperature variation and part detachment of the feedstock inside the mold cavity were observed. It has been demonstrated that ultrasonic velocity in feedstock inside the mold cavity, the ultrasonic contact duration during which the part and mold are in contact, and holding pressure can be used to assist with optimization of injection and cooling parameters to minimize energy consumption and maximize process efficiency. DOI : 10.3139/217.0013 En ligne : https://drive.google.com/file/d/1xrDfT5JbzqF3iyV4NMV3lWcMsfiAlg2T/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2752 [article]

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