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Partager le résultat de cette rechercheModel-free estimation of outdoor performance of a model epoxy coating system using accelerated test laboratory data / Brian Dickens in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 6, N° 4 (12/2009)
Titre : Model-free estimation of outdoor performance of a model epoxy coating system using accelerated test laboratory data Type de document : texte imprimé Auteurs : Brian Dickens, Auteur Année de publication : 2009 Article en page(s) : p. 419-428 Note générale : Bibliogr. Langues : Américain (ame) Tags : 'Epoxy coating' 'Accelerated service life test' 'Model-free exposure prediction' 'Computerized estimation procedure' 'NIST SPHERE' computer life' Index. décimale : 667.9 Revêtements et enduits Résumé : Laboratory and field exposure results for thin transparent films of a model epoxy coating system have been successfully linked using both dosage and dose, assuming only that the additivity law and the reciprocity law are valid. This paper describes the technique used in the linkage step. Laboratory exposures were carried out on the National Institute of Standards and Technology (NIST) Simulated Photodegradation by High Energy Radiant Exposures (SPHERE) using a factorial design of four temperatures, four relative humidities, four ultraviolet-visible ranges, and four neutral density filters. Similar specimens were exposed on the roof of a NIST laboratory in Gaithersburg, MD. The temperature and relative humidity of the outdoor exposures and the solar spectrum were used to characterize the roof environment at 12 min intervals. Chemical degradation of all specimens was followed by transmission Fourier Transform Infrared (FTIR) spectra. Dose, the radiation incident on the specimens, was estimated from lamp and filter spectra for the SPHERE exposures and from the solar spectra for outdoor exposures. Specimen UV–visible absorbance spectra were used with the estimates of dose to give estimates of dosage—the energy absorbed by the specimens. Using filter ranges for the SPHERE data allowed estimation of relative degradation efficiency over the range of the solar spectrum. This was used implicitly by the computer program to estimate the degradation in specimens exposed outdoors. The paper describes a model-free heuristic approach that automatically predicts chemical degradation outdoors using the outdoor environment parameters and the SPHERE laboratory data. That both dose and dosage are equally valid methods of successfully predicting outdoor degradation may be a consequence of all the films being approximately the same thickness (about 6 µm). DOI : 10.1007/s11998-009-9169-1 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-009-9169-1.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=7686
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 6, N° 4 (12/2009) . - p. 419-428[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 011845 - Périodique Bibliothèque principale Documentaires Disponible
Titre : Response of slot coating flow to gap disturbances : effects of fluid properties, operating conditions, and die configurations Type de document : texte imprimé Auteurs : Semi Lee, Auteur ; Jaewook Nam, Auteur Année de publication : 2015 Article en page(s) : p. 949-958 Note générale : Bibliogr. Langues : Américain (ame) Tags : 'Slot coating' 'Frequency response' 'Finite element method' Uniformity 'Gap disturbance' Index. décimale : 667.9 Revêtements et enduits Résumé : Slot coating is perhaps one of the most successful film manufacturing methods and is used to produce a wide variety of products. It is a pre-metered method and ideal for high-precision coating: the steady-state thickness is precisely controlled by the flow rate fed to the die and the web speed. However, the coating method is surrounded by small-scale disturbances that can destroy film thickness uniformity. Among various disturbances, a periodic change of the coating gap, the so-called gap disturbance, is considered the most dangerous in previous studies, e.g., Romero and Carvalho (Chem Eng Sci 63(8):2161–2173, 2008), Tsuda et al. (AIChE J 56(9):2268–2279, 2010), and Lee and Nam (AIChE J, 2015). However, the effects of fluid properties, operating conditions, and die configurations on the slot coating flow under gap disturbances are not examined in detail. In this study, we revisit the computer-aided analysis of transient slot coating flow designed to predict the thickness variations under gap disturbance. Extensive computational predictions reveal important parameters for suppressing film nonuniformity that can be induced by gap disturbance. Note de contenu : - GOVERNING EQUATIONS AND BOUNDARY CONDITIONS
- SOLUTION METHODS
- RESULTS AND DISCUSSION : Effects of fluid properties - Effects of operating conditions - Effect of die configurationsDOI : 10.1007/s11998-015-9684-1 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9684-1.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24697
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 5 (09/2015) . - p. 949-958[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 17467 - Périodique Bibliothèque principale Documentaires Disponible
Titre : Rheology and flow of paints in roll coating processes Type de document : texte imprimé Auteurs : Olivier Cohu, Auteur ; A. Magnin, Auteur Année de publication : 1997 Article en page(s) : p. 102-107 Note générale : Bibliogr. Langues : Anglais (eng) Tags : Peinturage 'Coil coating' Rouleau Ecoulement 'Propriété rhéologique' Peinture Etalement Feuil Epaisseur Index. décimale : 667.9 Revêtements et enduits Résumé : The paints used in the coil-coating/roll-coating process often have a rheological behaviour of the thixotropic yieldstress type. This may be necessary in order to prevent the pigments from settling during storage. However, it has been shown that the structures responsible for this behaviour should be sufficiently fragile to be destroyed very quickly as the paint passes between two counter-rotating rolls, in spite of the brief period of time the fluid is subjected to stresses during this flow. It therefore follows that modelling the process with a view to predicting the thickness of the final coating may be based on a determination of the viscosity of the paints in a steady flow regime at 104 s−1, a result which was confirmed by coating experiments.
In contrast, the ability of a paint to level the defects that are inevitably generated on the liquid film is connected with its thixotropic properties. In order to obtain representative data, they must be measured during unsteady flow with a low rate of shear, following intense pre shearing. It has been shown that the kinetics of paint structure recovery, or recovery of viscosity, is of decisive importance. If this occurs too rapidly, a significant yield stress appears before the film is completely levelled, thus fixing the residual defects. The thixotropic properties, required to prevent sedimentation from occurring, must therefore be characterised by a sufficiently slow structure recovery time.Note de contenu : - Analysis of the oil-coating processNALYSYS OF THE OIL-COATING PROCESS
- STEADY-STATE RHEOLOGY OF PAINTS
- BEHAVIOUR OF PAINTS FLOWING BETWEEN TWO COUNTER-ROTATING ROLLS
- APPLICATION TO THE PREDICTION OF COATING THICKNESS
- RHEOLOGY OF PAINTS AND FILM LEVELLINGPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17152
in SURFACE COATINGS INTERNATIONAL > Vol. 80, N° 3 (03/1997) . - p. 102-107[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 006580 - Périodique Bibliothèque principale Documentaires Disponible
Titre : Development of electron beam curable coatings for prepainted strip Type de document : texte imprimé Auteurs : G. M. Miasik, Auteur Année de publication : 1996 Article en page(s) : p. 258-267 Note générale : Bibliogr. Langues : Anglais (eng) Tags : 'Peinture radiodurcissable' Durcissement 'Irradiation électron' 'Coil coating' 'Acrylate polymère' Formulation 'Résistance intempérie' 'Etude expérimentale' Index. décimale : 667.9 Revêtements et enduits Résumé : There has been considerable growth in the production of prepainted steel over the past decade. This has been due to the increased usage of prepainted steel products in the construction and domestic appliance industries and a recognition by the automotive manufacturing industry of the benefits of prepainted steels, such as Durasteel and Bonazinc. The coil coating industry is, however, under increasing pressure from environmentalists who question the manufacture, content and recyclability of prepainted steel. The major areas of concern are the levels of solvents used in current coil coating paints, the continued use of chromates in pretreatments and primers and the recyclability of halogen-containing (PVC, PVF2) prepainted steels. The European steel industry must respond positively to these environmental pressures if it wishes to maintain and expand its coil coating operations.
Radiation curing has a large potential as a future processing technology for the production of prepainted steel strip. This technology is currently widely used throughout the plastic, paper and wood-coating industries where it shows a number of environmental advantages over conventional thermal curing.Note de contenu : - PRINCIPLES OF RADIATION CURING
- CURING MECHANISMS
- THE CHEMISTRY OF RADIATION CURING : acrylate systems - oligomeric (resinous) reactive material - diluents - non-reactive diluents - reactive diluents - adhesion promoters
- EXPERIMENTAL PROGRAMME : raw materials - electron beam curing unit (EBCU) - coating development - addition of pigmentation
- DETERMINATION OF DEGREE OF CURE OF COATING BY FTIR : unpigmented coating - pigmented coating - investigation of heat aging phenomenon - adhesion of EB curable coating to thermally cured topcoats - corrosion testing
- ACCELERATED WEATHERING OF COATING : non-topcoated samples - topcoated panels
- EXTERIOR WEATHERING OF COATING : non-topcoated panels - polyester topcoated panels
- EFFECT OF PROCESS VARIATION ON PERFORMANCE OF COATING : FTIR estimation of cure
- MODIFICATION OF COATING : reduction of gloss by the addition of matting agents - addition of plasticersPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17049
in SURFACE COATINGS INTERNATIONAL > Vol. 79, N° 6 (06/1996) . - p. 258-267[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 006572 - Périodique Bibliothèque principale Documentaires Disponible
Titre : Les rencontres TCL 10 Type de document : texte imprimé Auteurs : Jean-François Dhennin, Auteur Année de publication : 2000 Article en page(s) : p. 65-68 Langues : Français (fre) Catégories : Contre-collage
Enduction textile
Textiles et tissus -- Apprêt
Textiles et tissus -- Aspect de l'environnement
Textiles et tissus -- RecyclageTags : Textiles Coton Polyesters PVC 'Enduction bache camion' Ennoblissement Microencapsulation Caractérisation 'Composites textiles/polymères' rideau' 'Curtain coating' 'Procédé Vinyloop' Recyclage Environnement Index. décimale : 677 Textiles Résumé : Textile Coating and Laminating 10, la dixième conférence sur l'enduction et le contrecollage, s'est tenue à Lyon les 9 et 10 octobre. Vif succès pour cette première édition en France avec plus de 150 participants internationaux. On peut cependant regretter la faible participation des entreprises françaises alors que les domaines d'application des tissus enduits et contrecollés sont en forte progression et qu'il s'agit d'un secteur dynamique de la filière textile. Note de contenu : - Nouvelles technologies : Enduction ponctuelle de poudre extra-fine par rouleaux gravés (EMS-Chemie/Sork) - Enduction de bâche de camion en une seule passe (Coatema)
- Caractérisation des enductions : Technologie d'enduction par rideau (curtain coating) (Saburai) - Comparaison de coton classique, coton DWR (traité déperlant permanent) et coton encapsulé EPIC (Nextec Applications)
- Applications : Procédé Vinyloop (Ferrari/Solvay)
- Problèmes environnementaux et recyclagePermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18875
in L'INDUSTRIE TEXTILE > N° 1325 (11/2000) . - p. 65-68[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 001186 - Périodique Bibliothèque principale Documentaires Disponible 21982 - Périodique Bibliothèque principale Documentaires Disponible
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