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Simulation of slot-coating of nanocellulosic material subject to a wall-stress dependent slip-velocity at die-walls / P. A. Fuaad in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 1 (01/2022)
[article]
Titre : Simulation of slot-coating of nanocellulosic material subject to a wall-stress dependent slip-velocity at die-walls Type de document : texte imprimé Auteurs : P. A. Fuaad, Auteur ; Agne Swerin, Auteur ; Fredrik Lundell, Auteur ; Martti Toivakka, Auteur Année de publication : 2022 Article en page(s) : p. 111-120 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cellulose La cellulose est un glucide constitué d'une chaîne linéaire de molécules de D-Glucose (entre 200 et 14 000) et principal constituant des végétaux et en particulier de la paroi de leurs cellules.
Enduction par filière
Formulation (Génie chimique)
Nanoparticules
Revêtements organiques
RhéologieTags : 'Enduction filière' 'Modèle Casson' 'Glissement non linéaire' Nanocellulose Index. décimale : 667.9 Revêtements et enduits Résumé : Bio-based nanocellulosic materials are non-toxic, renewable, exhibit excellent barrier properties, and are suitable candidates for sustainable food packaging applications. Sizing and designing coating parameters for slot-coating process using nanocellulose suspensions is challenging due to complex shear-thinning rheology and the presence of a water-rich boundary layer, effecting significant apparent slip at the wall. Previous studies have shown that the flow inside the coating bead can be complex, with occasional stagnation regions and a rheological model incorporating yield stress which should be considered while analyzing slot coating of nanocellulosic flows. This work extends earlier investigations by including the effects of the particle depleted water-rich boundary layer. The suspension is modeled as a Casson fluid with a shear-thinning viscosity, and the particle depletion at the wall is represented by an infinitely thin layer modeled as a local shear-dependent nonlinear slip law. The resulting two-phase flow equations are solved using a Finite Volume Method (FVM) coupled with the Volume of Fluid (VoF) method for tracking the free surface interface. It is observed that slip alters the flow’s dynamics in the coating bead, and the effect of slip cannot be ignored, especially at high shear rates. For thin films, the presence of slip enhances the flow, leading to more material coated on the substrate. In contrast, for thicker coatings, apparent slip leads to an augmentation in stagnant, non-yielded regions, potentially generating uneven surfaces. Note de contenu : - Mathematical formulation
- Numerical solution
- Table 1 Operating parametersDOI : https://doi.org/10.1007/s11998-021-00516-7 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00516-7.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37149
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 1 (01/2022) . - p. 111-120[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 23313 - Périodique Bibliothèque principale Documentaires Disponible Spin coating of Blu-Ray disks : modeling, experiments, limitations, and manipulation / Outi Tammisola in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 7, N° 3 (05/2010)
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Titre : Spin coating of Blu-Ray disks : modeling, experiments, limitations, and manipulation Type de document : texte imprimé Auteurs : Outi Tammisola, Auteur ; Fredrik Lundell, Auteur ; Georg Hellström, Auteur ; Torgny Lagerstedt, Auteur Année de publication : 2010 Article en page(s) : p. 315-323 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Revêtements:Peinture Tags : 'Revêtement spin' 'Disque blu-ray' Index. décimale : 667.9 Revêtements et enduits Résumé : A major challenge in the production of Blu-Ray Disks (BDs) is making the cover layer over the information area. The layer has to be both thick enough to protect the information and even enough for the information to be read through it optically. Furthermore, it is preferred not to cover the hole in the center of the disk. Spin coating is a candidate method for the production of these layers in a rapid reproduction process. When dispensing is performed off-center (in order not to cover the hole), a new complication appears, namely the formation of a slope toward the inner rim of the liquid film. Here, fundamental limitations for achieving even films in this system and ways to overcome the difficulties by manipulation of the process are studied. A mathematical model for this particular case of spin coating is obtained and validated by comparison with experiments made in industrial equipment aiming at producing BDs. The model agrees well with the experimental data. The model is then used to show that cover layers that fulfil the Blu-Ray specification are very difficult to produce with the spin-coating technique. Manipulation by inline curing and surface shear is added to the model and the results show that it is considerably easier to meet the BD specification when utilizing the manipulation. DOI : 10.1007/s11998-009-9204-2 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-009-9204-2.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9811
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 7, N° 3 (05/2010) . - p. 315-323[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 012381 - Périodique Bibliothèque principale Documentaires Disponible