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Journal articles
Open Access
Visualization of Liquid-Vapor Phase Change Phenomena in Impu

Visualization of Liquid-Vapor Phase Change Phenomena in Impulse Technology, TAPPI JOURNAL, June 2006, Vol. 5(6) (767 KB)

Journal articles
Open Access
Development of Predictive Oxygen Delignification Models Usin

Development of Predictive Oxygen Delignification Models Using Kinetic Expressions and Neural Networks, TAPPI JOURNAL, May 2006, Vol. 5(5) (151 KB)

Journal articles
Open Access
Development of a Jacobian Module for Advanced Pulp and Paper Simulation and Control, TAPPI JOURNAL January 2009

Development of a Jacobian Module for Advanced Pulp and Paper Simulation and Control, TAPPI JOURNAL January 2009

Journal articles
Open Access
Application of Advanced Wet-End System Using Carboxymethyl Cellulose to Mixed Pulp Slurries for Wood-Containing Paper Production, TAPPI JOURNAL May 2009

Application of Advanced Wet-End System Using Carboxymethyl Cellulose to Mixed Pulp Slurries for Wood-Containing Paper Production, TAPPI JOURNAL May 2009

Journal articles
Magazine articles
Open Access
Editorial: 2018 TAPPI Journal features diverse content, TAPPI Journal November 2018

Editorial: 2018 TAPPI Journal features diverse content, TAPPI Journal November 2018

Journal articles
Open Access
Life-cycle thinking in the pulp and paper industry, Part I: Current practices and most promising avenues, TAPPI JOURNAL, July 2007

Life-cycle thinking in the pulp and paper industry, Part I: Current practices and most promising avenues, TAPPI JOURNAL, July 2007

Journal articles
Open Access
Treatment of Bleaching Effluent From the Pulp and Paper Industry by Photcatalytic Oxidation, TAPPI JOURNAL, June 2007

Treatment of Bleaching Effluent From the Pulp and Paper Industry by Photcatalytic Oxidation, TAPPI JOURNAL, June 2007

Journal articles
Open Access
Developing a New Paradigm for Linerboard Fillers, TAPPI JOURNAL March 2008

Developing a New Paradigm for Linerboard Fillers, TAPPI JOURNAL March 2008

Journal articles
Open Access
Effects of calcium on sodium salt scaling with the presence of resin acids and fatty acids, TAPPI Journal June 2026

ABSTRACT: Reintroducing tall oil soap or its related products into high dry solids black liquor has been found to reduce sodium salt scaling in falling film evaporators. Aside from resin acids and fatty acids, which are the likely scale inhibitors, calcium is reintroduced into black liquor because of the relatively high calcium content of tall oil soap. One concern is that this increase in calcium content might lead to the formation of additional calcium and sodium scales in evaporators. In this work, we investigated the relationship among trace amounts of calcium, sodium salts, resin acids, and fatty acids in a controlled system using a model salt solution and a benchtop setup. We studied the effects of the calcium carbonate addition and calcium carbonate scales on sodium salt scaling in the presence of resin acids and fatty acids. We found that some calcium carbonate is incorporated in the precipitated sodium crystals, and the suspended sodium crystals become larger and more compact with increasing calcium carbonate concentration. Experiments in the benchtop setup show that precipitating calcium carbonate scale on the heat exchanger does not lead to a higher rate of sodium salt scaling. The solubility of calcium carbonate is not affected by the addition of resin acids and fatty acids. These findings indicate that the reduction in sodium salt scaling through the addition of tall oil soap is primarily related to resin acids and fatty acids, rather than to calcium or to interactions between calcium and mixtures of resin and fatty acids.

Journal articles
Open Access
Optimization of optical coverage of board surfaces with assessment of light scattering and absorption using mineral as a coating component, TAPPI Journal June 2026

ABSTRACT: One of the primary functions of mineral inclusion into paper or paperboard is to improve the optical performance of the substrate. A coating may be applied to a sheet in order to cover a dark base, to improve the sheet opacity, to give the correct smoothness and gloss, or to give a suitable surface on which to print. The brightness of a pigment has long been used as a guide for pigment choice in paper and board. However, the measured paper brightness is a function of color and light absorption (K) of the coating and base and the light scattering (S) within the sheet resulting from interfaces with different refractive index. The optical performance can be quantified by measuring the S&K coefficients as described by the Kubelka-Munk model/theory in a filled or coated paper sheet. In coating, this is often assessed as a function of coat weight, and the corresponding physical sheet properties are assessed at the same time; for example, the correct gloss, smoothness, point-to-point uniformity, and printability. The optical performance in the sheet is often not directly related to the pigment brightness, but is largely a function of the particle packing within the sheet and coating layer. In the first and second main sections of this work, respectively, we show how S&K calculations from the Kubelka- Munk equations can be used in coated sheets to determine the optical performance and how this can be used as a predictive tool for the final sheet performance. This is presented for base sheets with different starting brightness. The third section of this work focuses on how mineral combinations in coatings can be used to improve the light scattering and consequently the optical performance of the board. We include theoretical considerations and then finally share a case study for improvement on the optical properties of recycled board.

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