Numerical modeling of the spray/spin coating of the interior of metal beverage cans : complete three-dimensional simulation / David E. Weidner in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 1 (01/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 1 (01/2022) . - p. pages 97-109 Titre : Numerical modeling of the spray/spin coating of the interior of metal beverage cans : complete three-dimensional simulation Type de document : texte imprimé Auteurs : David E. Weidner, Auteur Année de publication : 2022 Article en page(s) : p. pages 97-109 Note générale : Bibliogr. Langues : Américain (ame) Catégories : canettes Dépôt par pulvérisation Modèles numériques Revêtement par centrifugation Simulation par ordinateur Index. décimale : 667.9 Revêtements et enduits Résumé : In this work we develop a numerical simulation of the spray coating of spinning beverage cans. Though the substrate of the can must be axisymmetric, the coating need not be. We start with an evolution equation, which was derived using scaling arguments and perturbation theory. We then use implicit finite differences and an ADI scheme, with periodic boundary conditions, to efficiently solve the problem numerically. The spray fan is modeled as an expanding ellipse, and we use parameters typical of the coating industry in our simulations. The simulations show that if the can rotates an exact integral number of rotations during the spray process, then the coating layer is almost axisymmetric. But when this cannot be achieved, then three-dimensional effects greatly change the coating dynamics of the thin liquid film and must be included in the analysis. Note de contenu : - Previous work - Derivation of fundamental equations - Spray fan and can geometry - Nondimensionalization - Numerical aspects - Results - Table 1 : Dimensional parameters for this simulation - Table 2 : Nondimensional parameters for this simulation DOI : https://doi.org/10.1007/s11998-021-00517-6 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00517-6.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37148 [article]

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Reduction in edge beading defects using two-axis spin coating technology : an analytical, numerical, and experimental study / Soroosh Mahmoodi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 5 (09/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 5 (09/2023) . - p. 1759-1771 Titre : Reduction in edge beading defects using two-axis spin coating technology : an analytical, numerical, and experimental study Type de document : texte imprimé Auteurs : Soroosh Mahmoodi, Auteur ; David E. Weidner, Auteur Année de publication : 2023 Article en page(s) : p. 1759-1771 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bordure -- Défauts Gravité Mouvement rotatoire Résines photosensibles Revêtement par centrifugation Index. décimale : 667.9 Revêtements et enduits Résumé : Spin coating is used by several industries to apply thin but uniform liquid films to a given substrate. While this method produces very uniform coatings over much of the substrate, near the periphery of the substrate, defects in the coating, sometimes referred to as edge beading, often occur. This paper explores the usage of a two-axis spin coating technology that leads to a more uniform film thickness near the edge of the substrate. By rotating the substrate on an axis parallel to the substrate, centrifugal forces are generated that act both normal and parallel to the substrate. These forces are known as elevated gravity and act to even out any existing coating irregularities and also to drain liquid toward the edge of the substrate. This study investigates the effect of elevated gravity on the coating dynamics of a photoresist liquid film on a circular silicon wafer. Using lubrication theory, we derive a modified evolution equation that includes the effects of elevated gravity. We solve this equation numerically using implicit finite differences. Four layers of a photoresist film are spin coated on 3-inch circular wafers using a two-axes spin technology under various elevated gravity conditions. The thickness of the dried coating layers near the periphery of the substrate is measured using a SEM device. Both the experiments and the simulations show that edge beading defects can be substantially reduced for the 500g elevated gravity case compared to the normal 1g gravity case. Note de contenu : - Mathematical model of fluid properties - Nondimensionalization - Numerical aspects - Experimental aspects - Results : Parameters used in simulation and experiments - Evolution of the coating layer in 1g environment - Evolution of the coating layer due to enhanced gravity effects - Table 1 : Physiochemical properties of our model photoresist film - Table 2 : Relationship between the rotation rate and elevated gravity DOI : https://doi.org/10.1007/s11998-023-00779-2 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-023-00779-2.pdf?pdf=button% [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39986 [article]

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