Accueil
Résultat de la recherche
3 résultat(s) recherche sur le tag 'filière''
Ajouter le résultat dans votre panier Affiner la recherche Générer le flux rss de la recherche
Partager le résultat de cette recherche
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
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 23313 - Périodique Bibliothèque principale Documentaires Disponible Slot die stripe coating of low viscous fluids / Sebastian M. Raupp in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 5 (09/2018)
[article]
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
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 20232 - 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)
[article]
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
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 11, N° 1 (01/2014) . - p. 89-93[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 16023 - Périodique Bibliothèque principale Documentaires Disponible