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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Large area, stretchable, wearable, screen-printed carbon heaters for use in elite sport / Andrew Claypole in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 1 (01/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 1 (01/2023) . - p. 261-273 Titre : Large area, stretchable, wearable, screen-printed carbon heaters for use in elite sport Type de document : texte imprimé Auteurs : Andrew Claypole, Auteur ; James Claypole, Auteur ; Jonathan Leeder, Auteur ; Greg Stevens, Auteur ; Fiona Johnson, Auteur ; Neil Bezodis, Auteur ; Matt Parker, Auteur ; Tim Claypole, Auteur ; David Gethin, Auteur ; Liam Kilduff, Auteur Année de publication : 2023 Article en page(s) : p. 261-273 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Carbone Chauffage électrique Electronique imprimée Encre Essais (technologie) Essais dynamiques Films plastiques étirables Nanoparticules Sérigraphie Traction (mécanique) Vêtements de sport Index. décimale : 667.9 Revêtements et enduits Résumé : Stretchable, nanocarbon heaters were screen-printed onto a stretchable film to create a passive heat maintenance device for elite sport. The heat uniformity and the temperature performance of these lightweight, large area electrothermal heaters were evaluated over a range of applied voltages using thermal imaging. The heaters provided a uniform heat over the 15 × 4 cm area with temperatures of 39°C, 54°C, and 72°C at 10, 15, and 20 V, respectively, within 150 s of being switched on. Tensile testing was used to examine the performance of the heaters under strain. At 20% nominal strain, the heaters gave a uniform heat output and a temperature of 44°C at 15 V, making it a promising candidate for wearable applications. The heaters were capable of maintaining temperatures of 40°C over 10 cyclic strains up to 10% nominal strain. The heaters were integrated into a proof-of-concept stretchable base-layer garment, with the effect of the heaters on skin temperature measured and thermal sensation evaluated during a simulated training session in an environmental chamber at an ambient temperature 0°C. The printed heaters maintained skin temperature and thermal sensation when compared with an unheated control. Note de contenu : - MATERIALS AND METHODS : Ink manufacture - Heater construction for electromechanical testing - Heater characterization - Cold chamber testing of proof of concept garment - RESULTS : Heater performance - Development and testing of proof-of-concept heated garment for sprint canoeist DOI : https://doi.org/10.1007/s11998-022-00666-2 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00666-2.pdf?pdf=button% [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38841 [article]

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Tailoring the properties of deposited thin coating and print features in flexography by application of UV-ozone treatment / Tamara Tomasegovic 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. 815-828 Titre : Tailoring the properties of deposited thin coating and print features in flexography by application of UV-ozone treatment Type de document : texte imprimé Auteurs : Tamara Tomasegovic, Auteur ; David Beynon, Auteur ; Tim Claypole, Auteur ; Sanja Mahovic Poljacek, Auteur Année de publication : 2016 Article en page(s) : p. 815-828 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Encre flexographique Essais (technologie) Flexographie Matériaux -- Propriétés fonctionnelles Ozone Photopolymères Rayonnement ultraviolet Traîtements de surface Index. décimale : 667.9 Revêtements et enduits Résumé : Printed functional materials are a rapidly growing area of interest for low-cost high-speed device manufacture with flexographic printing seen as a route to achieving this. The relationship between surface tension of the ink and surface free energy (SFE) of the photopolymer plate is a key for optimum performance. However, traditional methods of surface tension modification of the ink/coating often cannot be employed for functional inks. In this research, rapid, permanent modification of flexographic printing plate’s SFE is achieved through controlled UV-ozone treatment, and the effects of the treatment on the polar and dispersive component of SFE are analyzed by Fourier transform infrared attenuated total reflectance spectroscopy, swelling experiments, and roughness measurements. Printing trials using the modified printing plates reveal improved print uniformity and control of deposited ink layer thickness, as well as improved print features—particularly track and pad junctions which can be problematic for printed electronic applications. The ability to rapidly tailor printing plate SFE is of benefit to all volume printing applications. Furthermore, it is of critical importance for functional printing and printed electronics where surface tension of the ink is determined by the functional material and chemical modification is not possible or desirable. Note de contenu : - EXPERIMENTAL SETTINGS : Preparation of samples - Measurements and analysis methods - RESULTS : Hardness of the printing plate - Surface free energy results - Roughness of the UV-ozone treated samples - FTIR ATR analysis - Swelling of the UV-ozone-treated photopolymer - Test prints DOI : 10.1007/s11998-016-9794-4 En ligne : http://link.springer.com/content/pdf/10.1007%2Fs11998-016-9794-4.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27121 [article]

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The effect of plasma functionalization on the print performance and time stability of graphite nanoplatelet electrically conducting inks / Andrew Claypole in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 1 (01/2021)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 1 (01/2021) . - p. 193-203 Titre : The effect of plasma functionalization on the print performance and time stability of graphite nanoplatelet electrically conducting inks Type de document : texte imprimé Auteurs : Andrew Claypole, Auteur ; James Claypole, Auteur ; Tim Claypole, Auteur ; David Gethin, Auteur ; Liam Kilduff, Auteur Année de publication : 2021 Article en page(s) : p. 193-203 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Conduction électrique Encre d'imprimerie Encre électronique Graphite Nanoparticules Rhéologie Surfaces fonctionnelles Technique des plasmas Index. décimale : 667.4 Encres Résumé : Carbon-based pastes and inks are used extensively in a wide range of printed electronics because of their widespread availability, electrical conductivity and low cost. Overcoming the inherent tendency of the nano-carbon to agglomerate to form a stable dispersion is necessary if these inks are to be taken from the lab scale to industrial production. Plasma functionalization of graphite nanoplatelets (GNP) adds functional groups to their surface to improve their interaction with the polymer resin. This offers an attractive method to overcome these problems when creating next generation inks. Both dynamic and oscillatory rheology were used to evaluate the stability of inks made with different loadings of functionalized and unfunctionalized GNP in a thin resin, typical of a production ink. The rheology and the printability tests showed the same level of dispersion and electrical performance had been achieved with both functionalized and unfunctionalized GNPs. The unfunctionalized GNPs agglomerate to form larger, lower aspect particles, reducing interparticle interactions and particle–medium interactions. Over a 12-week period, the viscosity, shear thinning behavior and viscoelastic properties of the unfunctionalized GNP inks fell, with decreases in viscosity at 1.17 s−1 of 24, 30, 39% for the ϕ = 0.071, 0.098, 0.127 GNP suspensions, respectively. However, the rheological properties of the functionalized GNP suspensions remained stable as the GNPs interacted better with the polymer in the resin to create a steric barrier which prevented the GNPs from approaching close enough for van der Waals forces to be effective. Note de contenu : - Materials and ink synthesis - Methods - Table 1 : Composition of GNP inks, where GNP (graphite nanoplatelets, TPU (thermoplastic polyurethane resin), DAA (diacetone alcohol) - Table 2 : Three roll millling procedure DOI : https://doi.org/10.1007/s11998-020-00414-4 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00414-4.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35363 [article]

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