Blotching in roll coating / A. W. Mix in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 8, N° 1 (01/2011)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 8, N° 1 (01/2011) . - p. 67-74 Titre : Blotching in roll coating Type de document : texte imprimé Auteurs : A. W. Mix, Auteur ; Z. B. Chen, Auteur ; L. M. Johnson, Auteur ; A. Jeffrey Giacomin, Auteur Année de publication : 2011 Article en page(s) : p. 67-74 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Elastohydrodynamique Enduction au rouleau Matières plastiques -- Thermoformage Résistance aux taches Index. décimale : 667.9 Revêtements et enduits Résumé : After thermoforming, plastic parts are stacked for shipping, and these parts tend to stick together. Called nesting, sheet stock is often first coated with a silicone compound before thermoforming to prevent this. The coating usually consists of a small amount of lubricant dispersed in a majority of carrier fluid, and this fluid must then dry before reaching the sheet winder or else the coating blotches. This coupling of coating and drying to determine when to expect blotching is examined. Roll coating involves a dimensionless group called the elasticity number that governs the thickness of the coating to be dried. The drying section involves the evaporation of the coating carrier fluid, and then diffusion into the dry surrounding atmosphere. When analyzing the drying, a new dimensionless group that governs blotching is discovered, called blotchability. The result of this analysis allows practitioners to determine which operating conditions cause blotching, and how to eliminate it. Roll coating uses a deflecting rubber roll to apply vanishingly thin coatings (≤1 μm), an interesting elastohydrodynamic problem. Note de contenu : - Avoiding applicator flooding - Metering roll - Applicator roll - Avoiding blotching - Blotching and elasticity number DOI : 10.1007/s11998-010-9282-1 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-010-9282-1.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10924 [article]

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Flexible blade coating / A. Jeffrey Giacomin in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 9, N° 3 (05/2012)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 9, N° 3 (05/2012) . - p. 269-277 Titre : Flexible blade coating Type de document : texte imprimé Auteurs : A. Jeffrey Giacomin, Auteur ; J. D. Cook, Auteur ; L. M. Johnson, Auteur ; A. W. Mix, Auteur Année de publication : 2012 Article en page(s) : p. 269-277 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Modèles mathématiques Revêtements:Peinture Rhéologie Souplesse (mécanique) Index. décimale : 667.9 Revêtements et enduits Résumé : Flexible blades are often employed to spread liquid coating thinly onto a flat smooth substrate. In this study, we derive a fifth-order nonlinear ordinary differential equation for the thickness of a Newtonian coating and for the corresponding blade deflection. After solving this equation numerically, a graph is produced to help engineers predict the coating thickness. We find that blade deflection and coating thickness are governed by the blade angle and by a new dimensionless group called the blade flexibility. For values of blade flexibility less than one, the coating thickness matches that of a rigid blade. The results of this analysis provide an engineer with the ability to design a flexible blade configuration to deliver the desired coating thickness onto a substrate. DOI : 10.1007/s11998-011-9366-6 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-011-9366-6.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15951 [article]

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