High-speed imaging the effect of snap-off distance and squeegee speed on the ink transfer mechanism of screen-printed carbon pastes / Sarah-Jane Potts in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 17, N° 2 (03/2020)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 17, N° 2 (03/2020) . - p. 447-459 Titre : High-speed imaging the effect of snap-off distance and squeegee speed on the ink transfer mechanism of screen-printed carbon pastes Type de document : texte imprimé Auteurs : Sarah-Jane Potts, Auteur ; Chris Philips, Auteur ; Eifion Jewell, Auteur ; Ben Clifford, Auteur ; Yin Cheung Lau, Auteur ; Tim Claypole, Auteur Année de publication : 2020 Article en page(s) : p. 447-459 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Carbone Electronique -- Matériaux Encre d'imprimerie Encre électronique Imagerie (technique) Rhéologie Sérigraphie Index. décimale : 667.9 Revêtements et enduits Résumé : Screen printing is the most widely used process in the production of printed electronics due to its ability to consistently transfer inks containing a wide range of functional materials onto a range of substrates. However, despite its extensive use, the mechanism by which the ink is transferred through the mesh and onto the substrate is not fully understood. Existing theories are contradictory and lack experimental validation. Therefore, high-speed imaging was used in combination with a screen-printing simulation rig that was designed to provide good optical access to study ink deposition during the screen-printing process. The variation in the four stages of ink flow through the screen, described in the theory by Messerschmitt, has been quantified with respect to changes in snap-off distance and squeegee speed. Analyses of the images were compared with measurements of the ink properties and corroborated with analyses of the prints. This has provided a better understanding of the mechanism by which the ink transfers from the mesh to the substrate and subsequently separates in screen printing. This could be used as the basis for the development of predictive algorithms, as well as to improve the understanding of how to optimize print quality and performance. Note de contenu : - MATERIALS AND METHODS : Rheological and extensional testing - Screen-printing visualization method - Printed line characterization - RESULTS : Rheological and extensional testing - Assessment of print contact regions and print characterization DOI : https://doi.org/10.1007/s11998-019-00291-6 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-019-00291-6.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33995 [article]

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The impact of solvent characteristics on performance and process stability of printed carbon resistive materials / Bruce Philip in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 5 (09/2016)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 13, N° 5 (09/2016) . - p. 911-920 Titre : The impact of solvent characteristics on performance and process stability of printed carbon resistive materials Type de document : texte imprimé Auteurs : Bruce Philip, Auteur ; Eifion Jewell, Auteur ; David Worsley, Auteur Année de publication : 2016 Article en page(s) : p. 911-920 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Conducteurs organiques Couches minces Graphite Noir de carbone Résistance chimique Revêtement -- Séchage solvants Index. décimale : 667.9 Revêtements et enduits Résumé : Carbon conductive pastes deposited by screen printing are used in many commercial applications including sensors, PCB, batteries, and PV, and as such represent an important value-added coating. An experimental investigation was carried out into the role of the solvent on the drying characteristics, conductivity, and process consistency in screen printed carbon pastes. Four materials with solvent boiling points between 166 and 219°C were deposited at film thickness between 6 and 16 μm, and the sheet resistance and film thickness were measured after successive passes through an industrial dryer operating with an air temperature of 155°C. Sheet resistances of 14 Ω/sq. were obtained with the thicker films while thinner films produced a sheet resistance of 46 Ω/sq. Thinner films achieved a stable resistivity within a 2.5-min residence time, while the thicker films required a residence time in excess of 12.5 min to achieve a stable resistivity. As well as prolonging drying times, the higher boiling point increased the resistivity of the cured film. It is postulated that the lower resistance of the faster drying materials is a result of film stressing increasing inter particle contact. Process models indicate that multiple thin layers are a more efficient means of manufacture for the process parameters examined. Note de contenu : - MATERIALS AND METHODS : Material preparation and characterization - Coating deposition - Film characterization - RESULTS : Drying characteristics - Solvent impact on process consistency DOI : 10.1007/s11998-016-9802-8 En ligne : http://link.springer.com/content/pdf/10.1007%2Fs11998-016-9802-8.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27130 [article]

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