Relations between the rheological properties of coating colours and their performance in pilot-scale coating

Dahlvik, Peter; Lohmander, Sven; Lason, L.; Rigdahl, Mikael

doi:10.3183/npprj-2000-15-02-p106-113

Cited by 8 publications

(5 citation statements)

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“…Titanium dioxide nanopowder was prepared by different methods such as combustion (Deorsola and Vallauri 2008), solvent evaporation (Fumin et al 2007), hydrothermal (Kobayashi et al 2008;Yamamoto et al 2009;Inagaki et al 2001;Kumar et al 2009) and hydrolysis (Mahshid et al 2007;Zhang et al 2009;Jun et al 2007;Dahlvik et al 2000). Its particle size could be precisely controlled in industrial applications to maximize its reflectance.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, characterization and application of TiO2 nanopowders as special paper coating pigment

et al. 2013

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TiO 2 nanopigments in two pure crystallographic forms (anatase and rutile) have been synthesized successfully by two methods; hydrothermal and hydrolysis. The produced pigments from the two methods were investigated physicochemically by several analyses tools. Then they were applied in paper coating mixtures and their influence on coated paper properties was systematically investigated. XRD and FTIR investigations showed that the prepared pigments using hydrothermal method at 100 and 120°C were a mixture of anatase and brookite and pure anatase, respectively, whereas hydrolysis method produced pure rutile phase pigment. TEM investigation showed that the crystallite size of anatase, mixture of anatase and brookite and rutile samples are 6.2, 11.7, and 9.2 nm, respectively. BET studies proved that anatase pigment has 140.74 m 2 /g, 0.237 cc/g and 18.33 Å , whereas rutile has 60.621 m 2 /g, 0.122 cc/g and 14.669 Å , surface area, pore volume and pore diameter, respectively. UV-Vis absorption and PL emission characteristics of the prepared pigments showed that the energy gaps for anatase, mixture of anatase and brookite and rutile are 3.36, 3.30 and 3.37 eV, respectively. The addition of the prepared nanopigments in conjugation with clay in coating mixture increased both brightness and opacity of the coated papers. The greatest effect was obtained upon using rutile nanopigment. Also there was a significant decrease in coated paper roughness while the air permeance started to decrease then increased at 50 % addition levels. In all coated paper, rutile pigment showed the highest enhancement effect on coated paper properties.

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Section: Introductionmentioning

confidence: 99%

Synthesis, characterization and application of TiO2 nanopowders as special paper coating pigment

et al. 2013

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“…When a coating mixture is applied to the paper, the dewatering or water penetration into the base paper induces the immobilization of the coating layer. The coating layer is further immobilized during the subsequent drying process, leading to shrinkage of the structure. , When a stiff and spherical particle, however, is incorporated in the coating mixture, the shrinkage of the coating layer during consolidation is counteracted. Apparently, plastic pigments act as spacers between the clay plates or the GCC particles and decrease the overall packing density (i.e., produce coated paper with loose packing), leading to high fiber coverage and a smooth surface of the coated paper. , In contrast to conventional mineral pigments, the plastic pigments tend to be located on the surface due to their low density.…”

Section: Resultsmentioning

confidence: 99%

“…The coating layer is further immobilized during the subsequent drying process, leading to shrinkage of the structure. 3,18 When a stiff and spherical particle, however, is incorporated in the coating mixture, the shrinkage of the coating layer during consolidation is counteracted. Apparently, plastic pigments act as spacers between the clay plates or the GCC particles and decrease the overall packing density (i.e., produce coated paper with loose packing), leading to high fiber coverage and a smooth surface of the coated paper.…”

Section: Effect Of Plastic Pigment On the Surfacementioning

confidence: 99%

“…During the coating process, the properties of a coating mixture may change with time, due to excessive dewatering or uncontrolled evaporation, which may be reflected in the behavior during the application of the mixture and in the properties of the coated layer. [1][2][3] These changes are greatly influenced by the interactions between the pigment particles in the coating mixtures which, in turn, are mainly determined by the surface chemistry of the particles, their surface charge, the adsorption of different additives, and ion exchange equilibrium. [4][5][6] The viscosity of the aqueous phase is known to be of considerable importance for the dewatering and immobilization of the coating layers and can be adjusted by the addition of either natural or synthetic watersoluble polymers with high molecular weights.…”

Section: Introductionmentioning

confidence: 99%

“…A pigment coating mixture may be considered to be a complex two-phase system consisting of solid pigment particles suspended in a fluid medium comprised of binders and soluble additives. During the coating process, the properties of a coating mixture may change with time, due to excessive dewatering or uncontrolled evaporation, which may be reflected in the behavior during the application of the mixture and in the properties of the coated layer. − These changes are greatly influenced by the interactions between the pigment particles in the coating mixtures which, in turn, are mainly determined by the surface chemistry of the particles, their surface charge, the adsorption of different additives, and ion exchange equilibrium. − …”

Section: Introductionmentioning

confidence: 99%

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Surface Characteristics of Coated Paper Improved by Plastic Pigments and Synthetic Thickeners

El-Sherbiny

Xiao

2005

Ind. Eng. Chem. Res.

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Synthetic thickeners, either polyacrylate or associative types, have been extensively used in paper coating. However, systematic research on the effect of these thickeners on coated paper surface structure in the presence of plastic pigment is still inadequate. In the current work, we compared and contrasted several commercial plastic pigments (PP), focusing on two hollow sphere and two solid bead plastic pigments having various particle sizes. Two types of polymeric thickeners were also selected, and their influence on the roughness and surface structure of coated paper were investigated. The results confirmed that the incorporation of plastic pigment in the clay coating mixtures resulted in a substantial decrease in the roughness of coated paper. The effect was particularly pronounced with hollow sphere plastic pigments. The addition of polymeric thickeners further reduced the roughness of the coated paper, for both clay/PP and ground calcium carbonate/PP systems. In coating mixtures based on clay, it was found that hydrophobically modified alkali swellable emulsion (HASE) thickener has a stronger effect on reducing the roughness of clay-based coated paper than polyacrylate thickener. The trend is opposite in the case of a ground calcium carbonate (GCC) coating system.

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Engineered surface for high performance electrodes on paper

Palmieri

Montaina

Polino

et al. 2023

Applied Surface Science

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Relations between the rheological properties of coating colours and their performance in pilot-scale coating

Cited by 8 publications

References 0 publications

Synthesis, characterization and application of TiO2 nanopowders as special paper coating pigment

Synthesis, characterization and application of TiO2 nanopowders as special paper coating pigment

Surface Characteristics of Coated Paper Improved by Plastic Pigments and Synthetic Thickeners

Engineered surface for high performance electrodes on paper

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