Effect of grey component replacement processing and varnishing on the light fastness of colours on cardboard prints / Tomislav Cigula in COLORATION TECHNOLOGY, Vol. 139, N° 1 (02/2023)  

[article]  inCOLORATION TECHNOLOGY > Vol. 139, N° 1 (02/2023) . - p. 16-27 Titre : Effect of grey component replacement processing and varnishing on the light fastness of colours on cardboard prints Type de document : texte imprimé Auteurs : Tomislav Cigula, Auteur ; Tamara Tomasegovic, Auteur ; Davor Donevski, Auteur ; Tomislav Hudika, Auteur Année de publication : 2023 Article en page(s) : p. 16-27 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Emballages Fourier, Spectroscopie infrarouge à transformée de Impression en couleur Mesure Papier et carton couché Photostabilité Réflexion totale atténuée Résistance à l'abrasion Solidité de la couleur Vernis en phase aqueuse Index. décimale : 535.6 Couleur Résumé : The visual appearance of packaging is one of its most important features. Electromagnetic irradiation causes a change in colour and often leads to colour fading (ie, to diminished visual appearance of a printed product). This research study aimed to determine the combined effect of grey component replacement image processing and varnishing on the protection of prints' appearance when exposed to accelerated ageing. For that purpose, two test charts were printed in a lithographic press and coated with water-based and ultraviolet-curable varnish before exposing them to xenon light. The prepared prints were evaluated by determining the tone values and colour difference, as well as the rub and abrasion resistance. In addition, Fourier Transform–infrared-attenuated total reflectance spectra were recorded to detect possible chemical changes caused by the (AcA). The results showed that the investigated period of (AcA) caused significant differences in the tone values of yellow, while the other primary colours proved to be more resistant. The water-based varnish provided better protection than the ultraviolet-curable varnish. The grey component replacement image processing diminished the colour difference caused by (AcA) on all the prepared print samples, and was particularly detected in tertiary colours containing the mid-range tone values of yellow (34%-68%). Both varnishes improved the rub resistance of aged prints, but only ultraviolet-curable varnish improved the abrasion resistance of both the unaged and the aged prints. In conclusion, applying varnish to prints ensured enhanced rub and abrasion resistance and diminished the colour change caused by (AcA). Finally, improved resistance to colour change was achieved by processing images with the grey component replacement method. Note de contenu : - EXPERIMENTAL : Materials and preparation of samples - Methods of measurement and analysis - RESULTS AND DISCUSSION : TVs of process colours and colour difference of tertiary colours - Rub and abrasion resistance of the prints - FTIR-ATR spectroscopy DOI : https://doi.org/10.1111/cote.12630 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12630 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39202 [article]

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Neural network-based UV adjustment of the photopolymer surface for modification of coating properties printed in flexography / Sanja Mahovic Poljacek in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 17, N° 1 (01/2020)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 17, N° 1 (01/2020) . - p. 271-284 Titre : Neural network-based UV adjustment of the photopolymer surface for modification of coating properties printed in flexography Type de document : texte imprimé Auteurs : Sanja Mahovic Poljacek, Auteur ; Tamara Tomasegovic, Auteur ; Mirela Leskovac, Auteur ; Suzana Jakovljevic, Auteur Année de publication : 2020 Article en page(s) : p. 271-284 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Flexographie Matériaux -- Epaisseur Photopolymères Réseaux neuronaux (informatique) Revêtements -- Analyse Revêtements -- Propriétés mécaniques Revêtements organiques Styrène-diène Index. décimale : 667.9 Revêtements et enduits Résumé : Processes of coating deposition often rely on printing techniques, with flexography being the most common one because of its ability to adjust the medium for the coating transfer (printing plate) to the specific type of coating and substrate by using photopolymer materials with different properties. Qualitative requirements for many types of coatings, especially in the printing industry, include uniformity, achieving desired thickness, definition of the edges of printed coating and optical density of colored coatings. This research was focused on the modification of the mechanical and surface properties of the common styrene–diene-based photopolymer materials in order to optimize the properties of the deposited coating—flexographic ink—by applying the UV post-treatment of the photopolymer. After the analyses of modified photopolymers, neural networks were built with the aim of finetuning of the photopolymer’s surface properties by the UV post-treatment. The results of the research enabled the analysis of the influence of changes that occur in the modified photopolymer material’s mechanical and surface properties on the coating thickness, optical density and printed element edge definition. Once the neural network was built, it enabled fast adjustment of the UV post-treatment of the photopolymer with the aim of optimizing the properties of the specific coating. Note de contenu : - EXPERIMENTAL : Preparation of the sample - Methods of measurement and analysis - RESULTS AND DISCUSSION : Measurements of printing plates - Measurements of the printed coating - Neural network for the prediction of the photopolymer SFE components DOI : 10.1007/s11998-019-00270-x En ligne : https://link.springer.com/content/pdf/10.1007/s11998-019-00270-x.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33744 [article]

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Polycaprolactone primers with zinc oxide and silicon dioxide nanoparticles for paper substrates : Influence on the properties of cyan and magenta offset prints / Tomislav Hudika in COLORATION TECHNOLOGY, Vol. 136, N° 5 (10/2020)  

[article]  inCOLORATION TECHNOLOGY > Vol. 136, N° 5 (10/2020) . - p. 435-449 Titre : Polycaprolactone primers with zinc oxide and silicon dioxide nanoparticles for paper substrates : Influence on the properties of cyan and magenta offset prints Type de document : texte imprimé Auteurs : Tomislav Hudika, Auteur ; Tamara Tomasegovic, Auteur ; Tomislav Cigula, Auteur ; Marija Prsa, Auteur Année de publication : 2020 Article en page(s) : p. 435-449 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adhésion Brillance (optique) Colorimétrie Cyan Le cyan est, par définition, la couleur primaire complémentaire du rouge, dans la synthèse soustractive des couleurs utilisée en photographie argentique en couleurs et en imprimerie. Dioxyde de silicium Magenta Le magenta est un colorant rouge violacé d'aniline de synthèse inventé en 1858, appelé fuchsine ou roséine. C'est aussi la désignation normalisée du colorant primaire absorbant le vert dans la synthèse soustractive des couleurs en imprimerie et en photographie argentique. Nanoparticules Offset (imprimerie) Oxyde de zinc Papier Papier -- Propriétés mécaniques Papier enduit Poly-e-caprolactone Primaire (revêtement) Résistance à l'abrasion Résistance à la traction Index. décimale : 667.2 Colorants et pigments Résumé : In this research study, the applicability of polycaprolactone‐silicon dioxide and polycaprolactone‐zinc oxide coatings used as primers on papers for offset printing, was analysed. Polycaprolactone nanocomposites with different concentrations of nanoparticles were prepared and coated onto three types of papers: uncoated, low‐coated and gloss. The main aim was to analyse the influence of the nanoparticle concentration in primer on the optical and colorimetric properties of cyan and magenta offset printed samples. To further evaluate the applicability of the primers, the tensile strength of primed samples and their surface properties were analysed. Results show that prepared primers are primarily applicable on uncoated and low coated papers. Both nanoparticles in specific concentrations increased gloss values for printed samples on low‐coated paper, and the addition of both types of nanoparticles increased the rub resistance of printed samples. Furthermore, for each type of nanoparticle, the optimal concentration at which the colour deviation on print was minimised could be defined. Adding nanoparticles to primers did not significantly improve mottling on cyan‐printed samples. However, by increasing the concentration of nanoparticles in the primer by up to 1%, the mottling on magenta‐printed samples decreased. Note de contenu : - EXPERIMENTAL : Materials and preparation of samples - Methods of measurement and analysis - RESULTS AND DISCUSSION : Tensile strength - Surface properties and adhesion parameters in the paper-primer-ink system - Rub resistance - Gloss - Smoothness of primed papers - Colorimetric properties of printed samples - Mottling DOI : https://doi.org/10.1111/cote.12487 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12487 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34487 [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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