Process limits in two-layer reverse roll transfer / M. Sasaki in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 10, N° 4 (07/2013)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 10, N° 4 (07/2013) . - p. 485-492 Titre : Process limits in two-layer reverse roll transfer Type de document : texte imprimé Auteurs : M. Sasaki, Auteur ; W. J. Suszynski, Auteur ; M. S. Carvalho, Auteur ; Lorraine F. Francis, Auteur Année de publication : 2013 Article en page(s) : p. 485-492 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Défauts Enduction au rouleau Revêtements multicouches Index. décimale : 667.9 Revêtements et enduits Résumé : Reverse roll coating in which a thin single layer of liquid is applied onto a substrate has been used in industry for decades and has been extensively analyzed in the literature. Modern coatings, however, are often composed of more than one layer to improve the product performance and to reduce the manufacturing cost. Premetered methods such as slot, slide, and curtain coatings are typically used to produce such multilayer coatings. If the caliper of the substrate to be coated is not constant, then the coating gap and consequently the final film thickness deposited on the web will also be nonuniform. In this study, we focused on the use of reverse roll technique with slot die liquid delivery system to produce a uniform thin two-layer coating. The use of this coating technique to produce such a coating has not been previously explored. The liquid film surface as it is transferred from a rigid steel roll to a deformable urethane-covered roll was visualized to find out how the uniformity of the two-layer coating is affected by the speed ratio between two rolls, layers’ wet thicknesses, and liquid viscosities. The effect of these parameters on the ribbing frequency and amplitude was also investigated. The results show that in the two-layer coating, as in the single layer reverse transfer, there is a critical web speed above which ribbing occurs. The critical speed is determined by the bottom layer viscosity. DOI : 10.1007/s11998-012-9444-4 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-012-9444-4.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19098 [article]

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Simultaneous multilayer coating of water-based and alcohol-based solutions / R. Horiuchi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 5 (09/2015)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 5 (09/2015) . - p. 819-826 Titre : Simultaneous multilayer coating of water-based and alcohol-based solutions Type de document : texte imprimé Auteurs : R. Horiuchi, Auteur ; W. J. Suszynski, Auteur ; M. S. Carvalho, Auteur Année de publication : 2015 Article en page(s) : p. 819-826 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Couches minces multicouches Démouillage (chimie des surfaces) Revêtements multicouches Solutions (chimie) Solutions aqueuses (chimie) Index. décimale : 667.9 Revêtements et enduits Résumé : Multilayer continuous liquid coating is the most efficient way to manufacture films that require more than one layer for optimal performance. Two-layer slot coating is one of the different coating methods largely used to deposit two thin, uniform liquid layers onto a moving substrate. In recent years, the operating conditions and solution properties which are required to avoid various coating defects have been discussed in the literature. However, these past studies have not focused on the problem of top layer dewetting, which may occur at some operating conditions. It is important to include in the operating window of the process, the region of the parameter space at which the top layer dewetting is avoided. In this work, we used water-based and alcohol-based solutions to create two-layer films over a moving substrate using a two-layer slot coating die. The critical operating condition at which top layer dewetting is observed is determined experimentally for different liquid viscosities, surface tensions, and wet thicknesses. A physical mechanism that explains the reported phenomenon is proposed. The results show how dewetting can be avoided by controlling the liquid properties (surface tension and viscosity) and wet thickness of each layer and will certainly help the design of two-layer slot coating processes. Note de contenu : - Results : Two layer slot coating - Effect of coating flow on top layer dewetting DOI : 10.1007/s11998-015-9689-9 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9689-9.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24680 [article]

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