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Partager le résultat de cette rechercheComputations of coating windows for reverse roll coating of liquid films in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 17, N° 4 (07/2020)
Titre : Computations of coating windows for reverse roll coating of liquid films Type de document : texte imprimé Année de publication : 2020 Article en page(s) : p. 897-910 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Traitement rouleau à rouleau Tags : 'Revêtement rouleau à rouleau' au inversé' 'Fenêtre de revêtement' 'Stabilité du Index. décimale : 667.9 Revêtements et enduits Résumé : This paper focuses on the flow stability of reverse roll coating flows employed in practical applications to coat thin liquid films on substrates of different materials. Other coating methods are available and various computer programs are purported to predict (for each corresponding method) the set of parameters that permit stable coating conditions. The application of these programs yields so-called coating windows for each particular coating setup. Knowing these coating windows permits coating methods to be applied with preknowledge of the sets of parameters for stable coatings. For reverse roll coating, computer codes for predicting coating windows are scarce or even nonexistent, which was the reason for the present work on the analytical considerations described in this paper. The results obtained formed the basis for a reverse roll coating computer program and its applications. The program is described, and computational results are provided. These are compared with experimental data available in the literature. Good agreement was obtained for high capillary number flows, but there were discrepancies between experimental and computational results for lower capillary numbers. The experimental results for low capillary number flows also appeared less reliable, which triggered the present experimental work. Some experimental results are given for low capillary numbers and these results are also compared with corresponding numerical data. It is suggested that a test section should be built consisting of two rollers and one slot die to study experimentally the stability regions of reverse roll coating flows in a rigorous manner. Note de contenu : - Theoretical background and essential equations
- Program to predict coating window suite
- Computations and results : Parameter study - Validation against experimental data
- Present experiments and first resultsDOI : https://doi.org/10.1007/s11998-020-00328-1 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00328-1.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34379
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 17, N° 4 (07/2020) . - p. 897-910[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 21864 - Périodique Bibliothèque principale Documentaires Disponible
Titre : Effect of sloped die lip geometry on the operability window in slot coating flows using viscocapillary and two-dimensional models Type de document : texte imprimé Auteurs : Si Hyung Lee, Auteur ; See Jo Kim, Auteur ; Jaewook Nam, Auteur ; Hyun Wook Jung, Auteur ; Jae Chun Hyun, Auteur Année de publication : 2014 Article en page(s) : p. 47-55 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Enduction par filière
RevêtementsTags : 'Buse à lèvres' 'Vortex en amont' aval' 'Fenêtre inclinée' 'Modèle de Navier-Stokes' Visco-capillaire' Revêtement Index. décimale : 667.9 Revêtements et enduits Résumé : As an indicator for determining the operability window in slot coating flow, the viscocapillary model considering various configurations of upstream and downstream slot die lips was tested and compared with Navier–Stokes two-dimensional model. Bead pressure and sloped lip angle conditions for uniform coating operation demarcated from leaking and bead break-up defects were quantitatively predicted from the position of upstream meniscus from both models. By comparing the results, it is confirmed that the viscocapillary model for many kinds of sloped die lips could predict the operability window accurately. It is also found that there exists vortex or recirculation regimes inside upstream and downstream coating bead regions, depending on the angles of sloped die lips, even for the stable coating flow. The flow control by die lip structure will be usefully applied to design the strategy for the reliable and optimal coating process, including vortex-free windows. Note de contenu : - GOVERNING EQUATIONS FOR COATING BEAD FLOW : Viscocapillary model considering the sloped die configuration - Calculation of 2-D coating bead flow DOI : 10.1007/s11998-013-9504-4 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-013-9504-4.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20615
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 11, N° 1 (01/2014) . - p. 47-55[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 16023 - Périodique Bibliothèque principale Documentaires Disponible
Titre : Slot die stripe coating of low viscous fluids Type de document : texte imprimé Auteurs : Sebastian M. Raupp, Auteur ; Marcel Schmitt, Auteur ; Anna-Lena Walz ; Ralf Diehm ; Helga Hummel ; Philip Scharfer ; Wilhelm Schabel Année de publication : 2018 Article en page(s) : p. 899-911 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Enduction par filière Tags : 'Enduit de filière' 'Revêtement à rayures' 'Fenêtre processus' 'Epaisseur minimale du film' 'Limite supérieure' 'Liquides peu visqueux' 'Modèle pour l'épandage Index. décimale : 667.9 Revêtements et enduits Résumé : Slot die coating is applied to deposit thin and homogenous films in roll-to-roll and sheet-to-sheet applications. The critical step in operation is to choose suitable process parameters within the process window. In this work, we investigate an upper limit for stripe coatings. This maximum film thickness is characterized by stripe merging which needs to be avoided in a stable process. It is shown that the upper limit reduces the process window for stripe coatings to a major extent. As a result, stripe coatings at large coating gaps and low viscosities are only possible for relatively thick films. Explaining the upper limit, a theory of balancing the side pressure in the gap region in the cross-web direction has been developed. Note de contenu : - Determination of process window
- Finally, the following observations for strippe coatings can be stated
- A first theoretical approach to explain the experimental findings and an upper limit for stripe coatings
- Upper limit and maximum hwet film thickness calculationsDOI : 10.1007/s11998-017-0039-y En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-0039-y.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31115
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 5 (09/2018) . - p. 899-911[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 20232 - Périodique Bibliothèque principale Documentaires Disponible
