In-line coated profiles : optimizing the pultrusion process / Nora Lardiès Miazza in JEC COMPOSITES MAGAZINE, N° 115 (08-09/2017)  

[article]  inJEC COMPOSITES MAGAZINE > N° 115 (08-09/2017) . - p. 28-30 Titre : In-line coated profiles : optimizing the pultrusion process Type de document : texte imprimé Auteurs : Nora Lardiès Miazza, Auteur Année de publication : 2017 Article en page(s) : p. 28-30 Langues : Anglais (eng) Catégories : Capteurs (technologie) Composites Formulation (Génie chimique) Micro-ondes Polyesters Polymérisation Primaire (revêtement) Procédés de fabrication Pultrusion Thermométrie Index. décimale : 668.4 Plastiques, vinyles Résumé : The pultrusion process in an effective way to process composites, however several drawbacks that reduce the competitiveness of pultruded profiles in comparaison to traditional materials still need to be addressed. On the one hand, the process is limited by the time required to polymerize the resin inside the die, which results in a low-speed process. On the other hand, when a coating is needed to improve surface properties, the surface of this profile must be carefully prepared off-line, requiring additional sanding and painting steps that are expensive, highly labour-intensive and polluting. Note de contenu : - Creating a specific microwave antenna for the pultrusion die - Formulating the resin with the necessary microwave susceptors - Modelling the pultrusion process for die design - Developing a specific sensor system to continuously monitor the curing degree of the resin and coating inside the pultrusion mould - Manufacturing the molds and integrating all the subsystems - Formulating a fast-curing primer to coat the composite profile and foster the adhesion of a debondable adhesive - FIGURES: 1. Antenna MW for the curing of the ALKE's profile (automotive sector) - 2. Open antenna system available in AIMPLAS' facilities and temperature vs. time for the curing of the polyester resin with susceptor C - 3. First curved sensor developed for an in-line process - 4. The real-time temperature measurements of the 4 heating zones together with the temperature at the Microwave heating area and the profile speed are displayed - 5. Online prediction of the degree of cure from the 4 cure sensors. At the top right-hand-side the real-time degree of cure are displayed for the 2 sensors in the resin region and the other 2 cure sensors at the primer area - 6. First coated pultrusion profile obtained in-line - 7. Assembly of the full cargo bed by adhesive join and easy debonding picture En ligne : https://drive.google.com/file/d/12IuSL86RZkzKNJgfIO_B9aZ9IFggERka/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29170 [article]

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Susceptors improve microwave curing technology for thermosetting resins / Nora Lardiès Miazza in JEC COMPOSITES MAGAZINE, N° 104 (04-05/2016)

[article]  inJEC COMPOSITES MAGAZINE > N° 104 (04-05/2016) . - p. 47-49 Titre : Susceptors improve microwave curing technology for thermosetting resins Type de document : texte imprimé Auteurs : Nora Lardiès Miazza, Auteur Année de publication : 2016 Article en page(s) : p. 47-49 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Copolymère vinyle ester Epoxydes Matières plastiques -- Additifs Micro-ondes Ondes électromagnétiques -- Absorption Polyesters Réticulation (polymérisation) Suscepteur Un suscepteur est un matériau utilisé pour sa capacité d’absorption de l’énergie électromagnétique et de la convertir en chaleur. C’est un matériau métallique conducteur qui est utilisé pour transférer la chaleur à une autre pièce de métal ou autre matériau non conducteur ; le suscepteur est utilisé pour transférer la chaleur à la pièce cible par conduction ou radiation. Thermodurcissables Traction (mécanique) Index. décimale : 668.4 Plastiques, vinyles Résumé : The use of microwaves to initiate the curing process of resins is well known. Liquid resins that cure at high temperatures need an increase in temperature to start the polymerization reaction and finally become a solid material. Several methods can be used to increase the temperature, such as conventional heating, ultraviolet radiation, electron beam or microwave radiation. Microwave (MW) curing has two main advantages : heating is volumetric and homogeneous, and 2) curing time is reduced to seconds (so that VOC emissions are also reduced). Note de contenu : - MICROWAVE-ABSORBING (OR SUSCEPTORS) : Organic bipolar additives - Inorganic and microwave-transparent additives - ASSESSING THE SUITABILITY OF DIFFERENT MW SUSCEPTORS - FIGURES : 2. Molecules without bipolar moment and with bipolar moment - 3. A common ferroelectric filler : barium titanium - 4. Open antenna system available at AIMPLAS facilities - 5. Temperature and power vs. time for the cure of the polyester resin with susceptor a - 6. MW antenna curing of tensile test pieces with a robot - TABLES : 1. Result MW curing for different resins and gelcoats with suceptors a, b and c - 2. Tensile strength results for POLRES 305BV and CRYSTIC VE 676-03 with the best susceptors Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26052 [article]

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