Radio-frequency compression molding of recycled commingled polymers / F. Rios in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 1 (03/2012)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVII, N° 1 (03/2012) . - p. 138-143 Titre : Radio-frequency compression molding of recycled commingled polymers Type de document : texte imprimé Auteurs : F. Rios, Auteur ; M. S. Silverstein, Auteur Année de publication : 2012 Article en page(s) : p. 138-143 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alliages polymères Chlorure de polyvinyle Matières plastiques -- Moulage par compression Polyéthylène Polymères -- Recyclage Radiofréquences Index. décimale : 668.9 Polymères Résumé : The increasing consumption and resistance to natural decomposition of plastic materials has caused an ecological problem that is waiting for solutions, including economical recycling technologies. In this work, the properties of compression molded plastic boards made of commingled pellets of Polyethylene (PE) and Polyvinyl chloride (PVC), two incompatible widely used polymers, are investigated. The commingled pellets were mechanically mixed and flat boards with different ratios of PE and PVC were produced by compression molding, one set using radio frequency (RF) electromagnetic heating and the second using conventional conductive heating (CH). The main advantage of the RF system over the CH system is the much shorter heating time required to reach processing temperatures, making it an economically attractive alternative. However, the speed and intensity of the heat acting on the PVC in the RF process caused a reduction of the mechanical properties of the boards as a consequence of the degradation of the PVC. This problem was solved by the addition of process-specific additives, organic and inorganic, placed at the pellet’s interface. The results of this work demonstrate that commingled plastics can be efficiently compression molded using radio frequency, providing an alternative to conventional compression molding using conductive heating. DOI : 10.3139/217.2489 En ligne : https://drive.google.com/file/d/18QfKqL83GNstsMZPUBpRTaHJuFBRpKHU/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13747 [article]

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Saturated steam-assisted radio frequency fixation of reactive printed cotton fabrics / Arzu Yavas in COLORATION TECHNOLOGY, Vol. 127, N° 3 (2011)  

[article]  inCOLORATION TECHNOLOGY > Vol. 127, N° 3 (2011) . - p. 179-185 Titre : Saturated steam-assisted radio frequency fixation of reactive printed cotton fabrics Type de document : texte imprimé Auteurs : Arzu Yavas, Auteur ; Arif T Özgüney, Auteur Année de publication : 2011 Article en page(s) : p. 179-185 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants Coton Le coton est une fibre végétale qui entoure les graines des cotonniers "véritables"(Gossypium sp.), un arbuste de la famille des Malvacées. Cette fibre est généralement transformée en fil qui est tissé pour fabriquer des tissus. Le coton est la plus importante des fibres naturelles produites dans le monde. Depuis le XIXe siècle, il constitue, grâce aux progrès de l'industrialisation et de l'agronomie, la première fibre textile du monde (près de la moitié de la consommation mondiale de fibres textiles). Fixateurs (chimie) Radiofréquences Textiles et tissus imprimés Vapeur d'eau Index. décimale : 667.3 Teinture et impression des tissus Résumé : The aim of this study was the development of a prototype machine for the processing of fabrics, which can be used as a reactor for the continuous finishing processes. The optimum applicator design for fabrics was developed in accordance with laboratory-scale experimental studies. Reactive printed samples were treated with the combination of radio frequency and steam in order to take advantage of the steam energy and to improve energy absorption. The colour yields of the samples fixated with the combination of radio frequency and steam energy were compared with conventional steaming (10 min) and thermofixation (5 min) processes. It was observed that steam-assisted radio frequency fixation ensured similar colour yields in a shorter setting time (3 min) compared with conventional methods. It was concluded that the new system could be an alternative method of setting, with the advantages of time savings and lower energy consumption. Note de contenu : EXPERIMENTAL : Materials and chemicals - Ultraviolet/ozone treatments - Surface characterisation - Mechanical properties - Cationic dyeing - The evaluation of dyeing RESULTS AND DISCUSSION : Reflectance and scanning electron microscopy analysis - Wettability of aramid fabric - Surface analysis and mechanical properties - Dyeability to cationic dyes DOI : 10.1111/j.1478-4408.2011.00296.x En ligne : http://onlinelibrary.wiley.com/doi/10.1111/j.1478-4408.2011.00296.x/pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12196 [article]

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