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A process model for slot coating of narrow stripes / Ara W. Parsekian in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 6 (11/2019)
[article]
Titre : A process model for slot coating of narrow stripes Type de document : texte imprimé Auteurs : Ara W. Parsekian, Auteur ; Tae-Joong Jeong, Auteur ; Tequila A. L. Harris, Auteur Année de publication : 2019 Article en page(s) : p. 1653-1661 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Alcool polyvinylique
Enduction par filière
Formulation (Génie chimique)
Impression à motifs
Modèles mathématiques
Procédés de fabricationIndex. décimale : 667.9 Revêtements et enduits Résumé : Selective deposition of patterned films, without masks or subtractive postprocessing steps, can potentially be achieved by extending the capabilities of traditional slot coating. Realization of a fully additive-only approach of this nature will elevate the viability of slot coating for numerous emerging technologies such as flexible optoelectronic devices, sensors, and wearables. In this study, we develop a process model for slot coating of variable-width narrow stripes, as a fundamental and representative pattern feature for patterned slot coating. Our process model addresses the sensitivity of stripe output to fluid deposition rate, substrate speed, and coating gap for a given coating material. To explain the observed process behavior, we distinguish between separate configurations of contact line pinning of the liquid bridge at the coating tool surface and show experimentally how these configurations relate to regimes in the process model that must be characterized separately. We also demonstrate how the geometry of the liquid bridge and range of intermediate contact angles along its contact line correspond to observed hysteresis of the coated stripe width. Note de contenu : - MATERIALS AND METHODS : Materials - Experimental methods - Empirical modeling approach
- RESULTS AND DISCUSSION : Dimensional analysis - Empirical model formulation - Methodology and demonstrationDOI : 10.1007/s11998-019-00233-2 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-019-00233-2.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33418
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Code-barres Cote Support Localisation Section Disponibilité 21321 - Périodique Bibliothèque principale Documentaires Disponible A simulation model to approximate penetration of a non-newtonian fluid into a porous media during slot die coating / Xiaoyu Ding in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 11, N° 1 (01/2014)
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Titre : A simulation model to approximate penetration of a non-newtonian fluid into a porous media during slot die coating Type de document : texte imprimé Auteurs : Xiaoyu Ding, Auteur ; Thomas F. Fuller, Auteur ; Tequila A. L. Harris, Auteur Année de publication : 2014 Article en page(s) : p. 83-87 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Enduction par filière
Fluides non newtoniens
Matériaux poreux
RevêtementsIndex. décimale : 667.9 Revêtements et enduits Résumé : A computational fluid dynamics (CFD) model has been developed to predict the penetration depth of a non-Newtonian fluid as it is directly coated onto porous media by a slot die coating process. The model couples 1-D modified Blake–Kozeny equations and Navier–Stokes equations. Experiments of coating a non-Newtonian solution (black strap molasses) onto carbon paper (Toray 090) are conducted and the penetration depths are measured to validate the model. Preliminary results show that predicted and measured penetration depths follow the same trend; that is, as the coating speed increases the penetration depth decreases. However, the simulated penetration depths are found to be one to two times higher than measured values at low coating speeds. Even so, the results are considered reasonable, due to imposed simplifications and approximations of the CFD model and errors associated with the experiments and measurements. DOI : 10.1007/s11998-013-9501-7 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-013-9501-7.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20619
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Code-barres Cote Support Localisation Section Disponibilité 16023 - Périodique Bibliothèque principale Documentaires Disponible The effect of solidification on the casting window after bubble entrainment / Zakaria Y. Ahmad in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 11, N° 1 (01/2014)
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Titre : The effect of solidification on the casting window after bubble entrainment Type de document : texte imprimé Auteurs : Zakaria Y. Ahmad, Auteur ; Tequila A. L. Harris, Auteur Année de publication : 2014 Article en page(s) : p. 89-93 Note générale : Bibliogr. Langues : Américain (ame) Tags : 'Bulles d'air' Solifidication 'Enthalpie-Porosité' 'Volume de fluide' 'Enduction par filière' Moulage Revêtements Index. décimale : 667.9 Revêtements et enduits Résumé : The objective of this work is to investigate the feasibility of extending the velocity boundary during the slot die casting of a polymer film, by studying the dynamics of entrained bubbles as they transition from the fluid to the solid phase. The solution of interest is a relatively high viscosity non-Newtonian solution. A 2D computational fluid dynamics model, using ANSYS FLUENT 13.0 software, was developed to analyze this behavior. The volume of fluid method and enthalpy–porosity technique were used to track the air (i.e., entrained bubbles) and fluid phases and the solidification of the solution, respectively. It has been found that for this class of solution, bubbles that are entrained in the fluid phase will not diffuse out of the fluid due to the stresses formed during solidification. Thus, for relatively high viscosity non-Newtonian solution, the upper boundary of the casting window cannot be extended after a defect has originated in the film during the casting process. DOI : 10.1007/s11998-013-9502-6 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-013-9502-6.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20620
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Code-barres Cote Support Localisation Section Disponibilité 16023 - Périodique Bibliothèque principale Documentaires Disponible Wetting behavior of the shear thinning power law fluids / Sima Didari in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 11, N° 1 (01/2014)
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Titre : Wetting behavior of the shear thinning power law fluids Type de document : texte imprimé Auteurs : Sima Didari, Auteur ; Zakaria Y. Ahmad, Auteur ; James D. Veldhorst, Auteur ; Tequila A. L. Harris, Auteur Année de publication : 2014 Article en page(s) : p. 95-102 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Angle de contact
Cisaillement (mécanique)
Enduction par filière
Fluides, Mécanique des
Mouillage (chimie des surfaces)
RhéologieIndex. décimale : 667.9 Revêtements et enduits Résumé : The knowledge of the wetting characteristics of a coating solution is a prerequisite of assuring the final quality of thin films manufactured by the slot die coating process. Because the maximum coating speed is limited by defects, such as air entrainment, which are directly related to film quality, an understanding of the coating limits is critical. Despite the existence of a vast body of literature to understand the occurrence of defects and the coating limits to produce defect-free films, the mechanism of air entrainment is still not well understood, especially for various classes of solutions. In this study, the shape of the upstream meniscus of a mildly shear thinning non-Newtonian coating bead has been studied both numerically and experimentally and subsequently linked to the air entrainment threshold. It has been found that the dynamic contact angle reaches its maximum value at the air entrainment threshold, primarily as a function of the capillary number. In addition, this work suggests that the onset of the dripping and air entrainment boundaries of solutions that follow the power law can be predicted based on the dynamic contact angle as a function of the consistency and power law indices. DOI : 10.1007/s11998-013-9503-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-013-9503-5.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20621
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Code-barres Cote Support Localisation Section Disponibilité 16023 - Périodique Bibliothèque principale Documentaires Disponible