Influence of particle size distribution of calcium carbonate pigments on coated paper whiteness / Nitin Kumar in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 8, N° 5 (10/2011)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 8, N° 5 (10/2011) . - p. 613-618 Titre : Influence of particle size distribution of calcium carbonate pigments on coated paper whiteness Type de document : texte imprimé Auteurs : Nitin Kumar, Auteur ; Nishi Kant Bhardwaj, Auteur ; Swapan Kumar Chakrabarti, Auteur Année de publication : 2011 Article en page(s) : p. 613-618 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Carbonate de calcium broyé Carbonate de calcium précipité Lumière -- Diffusion Opacifiants Papier enduit Pigments inorganiques Taille des particules Index. décimale : 667.9 Revêtements et enduits Résumé : The optical properties of pigments used for paper coating are linked to their morphology. The light scattering through coated layers depends upon the size and the size distribution of the pigments and their packing behavior. In this report the effect of particle packing of various calcium carbonate pigments on the whiteness of the final coated paper is studied. Different grades of calcium carbonate pigments of different particle size distribution and optics were used for coating applications on base papers. Base papers of different optics were also selected. The entire study was carried out at different coat weights. It was observed that the overall scattering from the coated sheet depends upon the light scattering from the base paper as well as through the coated layer. Higher light scattering through the coated layer will lower the effect of the base paper, whether it is dark or bright. So high bright and white pigments are not only the criteria for an enhancement in the optical properties of coated paper ; the particle size and size distribution should also be considered before introducing any pigment into a coating formulation. The base optics should also be chosen on the bases of the pigments’ optics and their morphology. Note de contenu : EXPERIMENTAL : Materials - Coating color preparation - Paper coating application - Analytical techniques. RESULTS AND DISCUSSION : Effect of pigment particle size distribution on coated paper whiteness before calendering - Effect of pigment particle size distribution on coated paper whiteness after calendering. DOI : 10.1007/s11998-011-9353-y En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-011-9353-y.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12237 [article]

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Influence of pigment blends of different shapes and size distributions on coated paper properties / Nitin Kumar in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 8, N° 5 (10/2011)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 8, N° 5 (10/2011) . - p. 605-611 Titre : Influence of pigment blends of different shapes and size distributions on coated paper properties Type de document : texte imprimé Auteurs : Nitin Kumar, Auteur ; Nishi Kant Bhardwaj, Auteur ; Swapan Kumar Chakrabarti, Auteur Année de publication : 2011 Article en page(s) : p. 605-611 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Brillance (optique) Carbonate de calcium broyé Carbonate de calcium précipité Lumière -- Diffusion Matériaux poreux Opacifiants Papier enduit Pigments inorganiques Résistance à l'arrachement Rugosité Index. décimale : 667.9 Revêtements et enduits Résumé : Paper coating pigment plays an essential role in the achievement of the desired end paper qualities. Different pigment varieties are available for paper coating. Ground calcium carbonate (GCC) is the major one used frequently in coating formulations. Precipitated calcium carbonate (PCC) is gradually gaining importance in paper coating, as it can be prepared in different shapes and sizes. The present study was carried out to determine the influence of PCC pigments with different shapes and sizes on paper properties, and their limitations and advantages when blended with finer grade GCC. PCC pigments of calcite and aragonite crystalline polymorphs having rhombohedral, orthorhombic, and scalenohedral habits were selected for the study. It was observed that the viscosity and water-holding capacity of the coating color was reduced with the introduction of PCC in the coating formulation. The PCC pigments showed greater light scattering, opacity, and smoothness of the coated paper as compared to the GCC pigment. The clustered (rosette) shape of scalenohedral habit calcite PCC results in the greatest light scattering, opacity, and surface strength amongst all PCCs. The aragonite PCC of orthorhombic habit and calcite PCC of rhombohedral habit show an almost similar trend in coated paper properties with the greatest smoothness and paper gloss. Note de contenu : EXPERIMENTAL : Materials - Coating color preparation - paper coating aplication - Methods. RESULTS AND DISCUSSION : Characteristics I : properties that respond the same to all the PCCs tested - Characteristics II : properties that have a mixed response to the PCC tested. DOI : 10.1007/s11998-011-9354-x En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-011-9354-x.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12236 [article]

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