Effect of blade-tip shape on the doctoring step in gravure printing processes / Kristianto Tjiptowidjojo in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 5 (09/2018)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 5 (09/2018) . - p. 983-992 Titre : Effect of blade-tip shape on the doctoring step in gravure printing processes Type de document : texte imprimé Auteurs : Kristianto Tjiptowidjojo, Auteur ; Daniel S. Hariprasad, Auteur ; Peter Randall Schunk Année de publication : 2018 Article en page(s) : p. 983-992 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Elastohydrodynamique Electronique imprimée Héliogravure Impression hélio Interaction fluide-structure Lubrification Racle Index. décimale : 667.9 Revêtements et enduits Résumé : A fundamental limit to the gravure printing process is in the doctoring step, in which a residual film defines the lower bound on allowable feature size. The resolution of finer features requires thin residual films, but these thin films increase the likelihood of wearing the doctor blades. A computational model was used to study the effect of blade-tip shape on residual film thickness while also minimizing the likelihood of wear. The blade-tip shape is altered by varying the bevel angles and the predicted film thickness is computed under various wiping speeds, configurations, and applied forces. In all cases studied, a slower wiping speed resulted in a thinner residual film, which is due to the doctoring step being governed by elastohydrodynamic lubrication. In some cases, a reversal of the wiping configuration created a thinner film, but it had no impact on the likelihood of wearing. Higher applied force leads to thinner residual film but the blade shape can have a more significant influence, indicating that lubrication forces dominate at this scale. Lastly, the likelihood of blade wear was predicted to vary within a small range for a fixed blade-tip shape over all conditions studied, which suggests that tip shape is the primary factor to consider when minimizing blade wear. DOI : 10.1007/s11998-017-0029-0 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-0029-0.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31122 [article]

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Evaluating sag resistance with a multinotched applicator : correlation with surface flow measurements and practical recommendations / Robert K. Lade in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 5 (09/2015)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 5 (09/2015) . - p. 809-817 Titre : Evaluating sag resistance with a multinotched applicator : correlation with surface flow measurements and practical recommendations Type de document : texte imprimé Auteurs : Robert K. Lade, Auteur ; Austin D. Musliner, Auteur ; Christopher W. Macosko, Auteur ; Lorraine F. Francis, Auteur Année de publication : 2015 Article en page(s) : p. 809-817 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Ecoulement bidimensionnel Essais (technologie) Latex Racle Résistance à l'écoulement Revêtements:Peinture Rhéologie Index. décimale : 667.9 Revêtements et enduits Résumé : Sag is a coating defect that results from excessive, gravity-driven flow after deposition. Accordingly, characterizing resistance to sag is critically important. In this paper, sag resistance predicted using a multinotched applicator test is compared with results obtained using an in situ particle tracking technique that measures surface velocity. Four commercial latex paints dried on substrates inclined at three angles were investigated. The results are used to provide insight into the strengths and limitations of using a multinotched applicator to evaluate sag resistance. For coatings dried on vertical surfaces (90°), the suggested condition for the multinotched applicator, sag lengths found by particle tracking show differences between paints that the multinotched applicator ranked as identical. At smaller angles (e.g., 10°), the resolution of the multinotched applicator test is greatly enhanced owing to a reduction in the shear stress difference between adjacent coated lines. Based on these results, specific recommendations are made for successfully employing a multinotched applicator to evaluate sag resistance based on user-specific goals. Note de contenu : - Materials - Anti-Sag Meter testing - Rheological characterization of latex paints - Sag length, initial wet film thickness, and evaporation rate measurements DOI : 10.1007/s11998-015-9680-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9680-5.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24679 [article]

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