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Interaction of rheology, geometry, and process in coating flow / Richard R. Eley in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 74, N° 932 (09/2002)
[article]
Titre : Interaction of rheology, geometry, and process in coating flow Type de document : texte imprimé Auteurs : Richard R. Eley, Auteur ; Leonard W. Schwartz, Auteur Année de publication : 2002 Article en page(s) : p. 43-53 Note générale : Bibliogr. Langues : Américain (ame) Tags : Modèle mathématique Simulation numérique Modélisation Propriété physique Tension superficielle surface Coulure peinture Défaut Ecoulement rhéologique Peinture Matériau revêtement Index. décimale : 667.9 Revêtements et enduits Résumé : A final coating of uniform thickness implies good leveling and the avoidance of defects during film formation. Though generally desired, this objective is often unmet. The outcome of a coating process depends on the nonlinear interaction of the rheology, process variables, and substrate geometry. Understanding the role of rheology is complicated by difficulties in linking fundamental rheological properties with coating performance. During a coating process, forces of varying type, magnitude and duration act on the fluid film. For non-Newtonian coatings the viscosity varies with both time and position within the coating layer, making predictions of flow behavior quite difficult. One answer is computer simulation, using numerical techniques to solve a set of nonlinear differential equations governing the flow. The rheological and other physical properties are parameter values for the program. We present results of mathematical modeling and numerical simulation ofa coating imperfection known as a dripmark. The model includes non-Newtonian rheology, substrate shape, surface tension, and gravity. We compare theoretical prediction with experimental observation in a study of two architectural paints. We also describe a new method of quantitatively measuring the surface profile of a coating defect. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5631
in JOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 74, N° 932 (09/2002) . - p. 43-53[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 001243 - Périodique Bibliothèque principale Documentaires Disponible Rheological approach to the capillary penetration of coating into wood / Mari de Meijer in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 73, N° 914 (03/2001)
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Titre : Rheological approach to the capillary penetration of coating into wood Type de document : texte imprimé Auteurs : Mari de Meijer, Auteur ; Barend van de Velde, Auteur ; Holger Militz, Auteur Année de publication : 2001 Article en page(s) : p. 39-51 Note générale : Bibliogr. Langues : Américain (ame) Tags : Matériau revêtement Peinture Vernis Bois Protection Liant Polymère Pénétration Tube capillaire Propriété surface Mouillage Tension superficielle rhéologique Eau Solvant organique Evaporation Agent Modélisation Etude expérimentale Index. décimale : 667.9 Revêtements et enduits Résumé : The penetration of water- and solvent-borne binders into the capillaries of wood was studied as a function of the viscosity, surface tension, and capillary pressure according to the Washburn equation. During the penetration, water is selectively removed from the coating, which causes a strong increase in viscosity that limits the penetration. Water-borne dispersions and emulsions showed a rapid increase in viscosity with increasing solid matter content. Surface tension of the binder and the adsorption of surfactants to the wood have an additional influence on the maximum penetration Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5721
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Code-barres Cote Support Localisation Section Disponibilité 001222 - Périodique Bibliothèque principale Documentaires Disponible Surface-tension-driven flows of coatings : Bondline readout formation / Richard H. J. Blunk in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 73, N° 918 (07/2001)
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Titre : Surface-tension-driven flows of coatings : Bondline readout formation Type de document : texte imprimé Auteurs : Richard H. J. Blunk, Auteur ; James O. Wilkes, Auteur Année de publication : 2001 Article en page(s) : p. 63-71 Note générale : Bibliogr. Langues : Américain (ame) Tags : Industrie automobile Matériau revêtement Peinture Vernis Formation film Etalement Défaut Tension superficielle Ecoulement Index. décimale : 667.9 Revêtements et enduits Résumé : Bondline readout (BLRO) is a coating defect frequently observed on adhesively bonded, polymeric automotive body panels. This paper addresses ridging BLRO in clearcoats, not optical and mechanical BLRO, which are characterized by metal-flake orientation (dark/light effects) in basecoats and by distortion in substrates, respectively. Ridging BLRO is due to film thickness differences and results from Marangoni-type, surface-tension-driven flows. In this study, the effects of several parameters on BLRO are investigated experimentally. These parameters include initial film thickness, heating rate, viscosity, solvent-to-resin surface-tension ratio, and solvent volatility. The experiments clearly demonstrate three modes of BLRO flow-formation, flow-out, and reformation-that result from competing surface-tension-gradient forces (temperature- versus concentration-induced). Experimental results are used to validate a proposed BLRO mechanism and, in subsequent work, a BLRO-predicting numerical code. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5740
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Code-barres Cote Support Localisation Section Disponibilité 001226 - Périodique Bibliothèque principale Documentaires Disponible