Best pigment coating for a dual-purpose coated paper / Jae Y. Shin in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 5 (09/2021)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 5 (09/2021) . - p. 1281-1294 Titre : Best pigment coating for a dual-purpose coated paper Type de document : texte imprimé Auteurs : Jae Y. Shin, Auteur ; Paul D. Fleming, Auteur ; Hak Lae Lee, Auteur Année de publication : 2021 Article en page(s) : p. 1281-1294 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Argile Emballages Formes des particules Impression jet d'encre Latex Liants Offset (imprimerie) Papier et carton couché Perméabilité Pigments Index. décimale : 667.9 Revêtements et enduits Résumé : Dual-purpose coated paper, which enables in-line inkjet printing with web offset, can be used for both offset and inkjet prints. This product has potential to meet the ever-increasing demand for printing individualized information on commercial printing materials. In this work, commercial samples were printed in the two presses. It was deduced that low permeability correlates with large color gamut volume. The correlation would be useful to design coating formulations for good printability. Also, we examined the packing of coating layers to identify a coating formulation that provides good printing quality in both offset and inkjet printing. Many combinations of pigments were tested, and the effects of particle shape on viscosity and packing were examined. For all coating colors, pigment mixtures with a weight ratio of 3:1 gave the highest packing density. The mixture of GCC 90 and delaminated clay with a weight ratio of 3:1 was the best selection studied for dual-purpose coated paper. Among commercial paper samples, a web offset coated paper showed the best overall performance, indicating that coating formulations with minimal blistering are suitable for dual-purpose coated paper. Note de contenu : - MATERIALS AND METHODS : Commercial coated papers - Permeability (K) of commercial papers - Pigments and a binder latex - Coating formulations for dual-purpose coated paper - Field-emission scanning electron microscopy images of pigments and coated papers, and paper testing - Color reproduction - Coating color properties - The application of packing theory to paper coating - RESULTS AND DISCUSSION : Trials of precommercial dual-purpose coated papers - Effect of particle shape on viscosity - Effect of particle shape on packing - Correlation between packing volume and surface properties - Table 1 Physical properties of commercial coated papers for offset, inkjet, and dual-purpose printing - Table 2 Characteristics of coating pigments and a binder latex - Table 3 Color gamut volumes and four-color optical ink densities of commercial coated papers - Table 4 Packing volume fractions of pigment-only dispersions and pigment–latex dispersions. Calcium carbonates and clays are assumed to have an equal density of 2.7 g/m3 so that weight (λw) and volume (λv) ratios are the same in pigment-only dispersions DOI : https://doi.org/10.1007/s11998-021-00491-z En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00491-z.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36432 [article]

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The influence of different shapes and size distributions of coating pigments on packing and dewatering / Jae Y. Shin in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 17, N° 6 (11/2020)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 17, N° 6 (11/2020) . - p. 1425–1436 Titre : The influence of different shapes and size distributions of coating pigments on packing and dewatering Type de document : texte imprimé Auteurs : Jae Y. Shin, Auteur ; Hak Lae Lee, Auteur Année de publication : 2020 Article en page(s) : p. 1425–1436 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Déshydratation Dispersions et suspensions Emballages Formes des particules Granulométrie Papier et carton couché Pigments Revêtements Rhéologie Index. décimale : 667.9 Revêtements et enduits Résumé : Particle shape and particle-size distribution (PSD) are important factors for pigment packing and water retention in the pigment coating process, being closely associated with many runnability problems. Diverse experimental investigations on the packing and dewatering of pigment slurries have been made. However, theoretical approaches remain lacking. This paper presents a joint experimental and theoretical analysis of the influence of pigment shape and PSD on pigment packing and dewatering. The relative viscosities of very dilute pigment slurries were measured and used to determine the intrinsic viscosity, based on the Einstein equation. The deviation of pigment shape from spherical caused an increase in viscosity of the slurries. Acicular precipitated calcium carbonates gave lower shape factor values than platy clay particles, which indicated that the needle-like particles could rotate more easily around their long axes under shearing conditions. The packing of pigments, which determines porosity, permeability, light scattering, and mechanical properties, was examined. The packing volumes of nonspherical pigments were estimated based on their respective PSDs, using an algorithm developed for spherical particles, modified with a correction factor. This model is based on the close random-packing volume fraction (∅2p) of particles of uniform size being an independent variable, regardless of their shape. Therefore, it was valid as long as the particles always achieve the same close random-packing volume (∅1p) by sedimentation or tapping. Overall, the effect of the particle shape and PSD on the dewatering and filter-cake permeability (Kf) was analyzed. The dewatering rates were measured with a common pressure filtration method, and the permeability of the filter cakes was obtained by fitting the data to a filtration equation. The particle size and PSD were found to influence the permeability constant, but there was little correlation between the permeability and particle shape. Note de contenu : - MATERIALS AND METHODS : Particle size distribution of pigments and SEM images - Characterization of pigments by viscosity measurement - Sedimentation volume of dispersion - Dewatering rate - THEORY AND CALCULATION : Model development - New approach - RESULTS AND DISCUSSION : Particle-size distribution of pigments - Effect of electrolyte on viscosity - Aspect ratio of pigment particles - Sedimentation volume of dispersion by centrifugation - Packing volume fractions of nonspherical particles - Dewatering and permeability of filter cake DOI : https://doi.org/10.1007/s11998-020-00371-y En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00371-y.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34949 [article]

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