Automated mold heating system using high frequency induction with feedback temperature control / K. Park in INTERNATIONAL POLYMER PROCESSING, Vol. XXVI, N° 5 (11/2011)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVI, N° 5 (11/2011) . - p. 490-497 Titre : Automated mold heating system using high frequency induction with feedback temperature control Type de document : texte imprimé Auteurs : K. Park, Auteur ; Y. S. Seo, Auteur ; D. H. Sohn, Auteur Année de publication : 2011 Article en page(s) : p. 490-497 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chauffage par induction Induction électromagnétique Matières plastiques -- Moulage par injection -- Appareils et matériel Moules d'injection Température -- Contrôle Index. décimale : 668.4 Plastiques, vinyles Résumé : High frequency induction heating is an efficient means of rapidly heating a mold surface by means of electromagnetic induction. It was recently applied to the rapid heating of injection molds for a range of purposes. To implement high frequency induction for rapid mold heating, the heating conditions have to be set appropriately to obtain the desired range of mold temperatures. In the present study, a rapid mold heating system is developed. It consists of a high frequency power supply, induction coils, a robot system, temperature sensors and controllers. The mold surface temperature is measured using the temperature sensors, and this data is then fed back to the controller so as to control the heating time. This fully automated induction heating system with feedback temperature control is then implemented for the injection molding of a transparent part with multiple holes, resulting in great improvement in the surface appearance as well as the optical properties of the molded part. Note de contenu : - Numerical analyses for induction heating of an injection mold - Rapid mold heating system with temperature control - Application of the rapid mold heating system to injection molding DOI : 10.3139/217.2426 En ligne : https://drive.google.com/file/d/1hP_sK_f5krrXzE6pbBzhWS6h0rbSsNI1/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12465 [article]

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Preparation and characterization of reduced graphene oxide based natural rubber nanocomposites / F. Shahamatifard in INTERNATIONAL POLYMER PROCESSING, Vol. XXXV, N° 5 (11/2020)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXV, N° 5 (11/2020) . - p. 492-502 Titre : Preparation and characterization of reduced graphene oxide based natural rubber nanocomposites Type de document : texte imprimé Auteurs : F. Shahamatifard, Auteur ; Denis Rodrigue, Auteur ; K. Park, Auteur ; S. Frikha, Auteur ; Fred Mighri, Auteur Année de publication : 2020 Article en page(s) : p. 492-502 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse spectrale Caoutchouc Caractérisation Elasticité Graphite Matériaux hybrides Matériaux hybrides -- Propriétés mécaniques Matériaux hybrides -- Propriétés thermiques Oxyde de graphène Réticulation (polymérisation) Thermocinétique Thermogravimétrie Vulcanisation Index. décimale : 668.4 Plastiques, vinyles Résumé : This work describes the effect of reduced graphene oxide (RGO) addition in natural rubber (NR). Firstly, RGO was synthesized based on the improved Hummer's method then characterized by Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and thermogravimetric analysis (TGA) to confirm that the RGO surface contains hydroxyl, epoxy, and carboxyl functional groups to improve graphene interaction with the NR matrix. In a second step, the synthesized RGO was predispersed in NR latex using the co-coagulation technique then added at different amounts (0 to 2 parts per hundred rubber (phr)) to a basic NR formulation and compounded in an internal mixer. The results show that the crosslink density of the developed NR/RGO nanocomposites increased by 65 % for RGO concentration of 2.0 phr. For the same RGO concentration, a significant increase in tensile strength (53 %) and Young's modulus (31 %) were also observed. Finally, a significant improvement (26 %) of the thermal conductivity was obtained with the addition of only 0.5 phr of RGO. Note de contenu : - EXPERIMENTAL : Materials - Preparation of reduced graphene oxide - Pre-dispersion of reduced graphene oxide in natural rubber latex using the co-coagulation technique - Preparation of natural rubber-based nanocomposites - CHARACTERIZATION : Mechanical properties and thermal behavior - Vulcanization and crosslink density - Fourier Transform infrared Spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS - RESULTS AND DISCUSSION : Graphite and graphene oxide characterization - Curing and properties of the basic NR matrix and its modified NR/G and NR/RGO nanocomposites DOI : https://doi.org/10.3139/217.3987 En ligne : https://drive.google.com/file/d/1a0Ao7lnJdrys6Mvy-R_f1VteBFq2qXtV/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35071 [article]

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