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Journal articles
Eucalyptus kraft pulp bleaching: state-of-the-art and new developments, TAPPI JOURNAL February 2008
Eucalyptus kraft pulp bleaching: state-of-the-art and new developments, TAPPI JOURNAL February 2008
Journal articles
Improvement of eucalyptus bleached kraft pulp effluent treatment through combined ozone-biological treatment, TAPPI JOURNAL February 2008
Improvement of eucalyptus bleached kraft pulp effluent treatment through combined ozone-biological treatment, TAPPI JOURNAL February 2008
Journal articles
Magazine articles
Rheological characteristics of platy kaolin, TAPPI JOURNAL September 2019
ABSTRACT: Platy kaolin can provide significant value in the coating of paper and paperboard. It can be used in multiple applications and can provide benefits such as titanium dioxide (TiO2) extension, smoothness improvement, improved print gloss or ink set rates, calendering intensity reduction, and improved barrier properties. It is not a pigment that can be simply substituted for traditional hydrous kaolin without some adjustment to the coating formulation. These adjustments can be as simple as reducing solids, but may require binder changes as well. The coater setup may need to be adjusted because of the unique rheological behaviors these pigments exhibit.The unique rheological characteristics of platy kaolin are explored here. Measurements of the water retention of platy kaolin containing coatings confirm that water retention is not reduced in comparison to more blocky kaolin pigments, despite the lower coating solids at which they need to be run. This means that the rheological characteristics are the most important in understanding the runnability. An extensive analysis reveals some unique behaviors that need to be understood when utilizing these materials. Viscoelastic measurements indicate that, for this binder system, Tan d is mainly a function of solids. This may explain how weeping is initiated on a blade coater. The degree of shear thinning behaviors is investigated using the Ostwald de-Waele power law. The immobilization point was determined using the Dougherty-Krieger equation and related to the work of Weeks at the University of Maine on blade coater runnability. An indirect measure of particle shape and size synergy is also demonstrated using the Dougherty-Krieger equation parameters.
Journal articles
Magazine articles
Flow characteristics of drag-reducing natural bamboo fiber suspensions with minimal environmental load, TAPPI Journal September 2019
ABSTRACT: The reduction of pipe friction loss by adding drag-reducing agents has attracted attention as an aid to energy conservation. Drag-reducing agents induce drag reduction (DR) effects and should have a minimal environmental load, with natural resource-saving potential. This study demonstrates bamboo fiber as a drag-reducing agent that saves natural resources and has a low environmental load. Using pressure drop measurements, we report DR with suspensions of bamboo fibers with the average diameter of 13.3 µm and aspect ratio of 98.7. The maximum DR obtained in this experiment is 43% at the concentration of 4000 ppm and pipe diameter of 30 mm; DR is affected by the Reynolds number, suspension concentration, and pipe diameter. In addition, the bamboo fibers can be easily removed from the suspensions by filtration. We found that low-environmental-load bamboo fiber has DR effects like those of other fibers; its effects are greater than those of conventional synthetic fibers and wood pulp. Furthermore, it is resistant to mechanical degradation, recoverable, and recyclable. Therefore, DR effects can be selectively obtained by adding the fibers only when DR is needed; the fibers can then be collected when DR is no longer necessary. This method might greatly expand the application range of DR agents. The results demonstrate the usefulness of bamboo fibers as DR additives.
Journal articles
3-D Computational Simulation of Paper Handsheet Structure and Prediction of Apparent Density, TAPPI JOURNAL September 2009
3-D Computational Simulation of Paper Handsheet Structure and Prediction of Apparent Density, TAPPI JOURNAL September 2009
Journal articles
Decreasing specific energy of thermomechanical pulps from reduction of raw materials variability, TAPPI JOURNAL September 2009
Decreasing specific energy of thermomechanical pulps from reduction of raw materials variability, TAPPI JOURNAL September 2009
Journal articles
Pre-Extraction of Hemicelluloses and Subsequent Kraft Pulping, Part II: Acid- and Autohydrolysis, TAPPI JOURNAL September 2009
Pre-Extraction of Hemicelluloses and Subsequent Kraft Pulping, Part II: Acid- and Autohydrolysis, TAPPI JOURNAL September 2009
Journal articles
Retention of PCC and GCC Fillers on Chemical Pulp Fines Surfaces, TAPPI JOURNAL September 2009
Retention of PCC and GCC Fillers on Chemical Pulp Fines Surfaces, TAPPI JOURNAL September 2009
Journal articles
Optimization of ECF Bleaching of Kraft Pulp: Part 1. Optimal Bleaching of Hardwood Pulps Made with DifferentAlkali Charges, TAPPI JOURNAL January 2008
Optimization of ECF Bleaching of Kraft Pulp: Part 1. Optimal Bleaching of Hardwood Pulps Made with DifferentAlkali Charges, TAPPI JOURNAL January 2008
Journal articles
Characteristics of Black Liquor Sprays from Gas-Assisted Atomizers in High-Temperature Environments, TAPPI JOURNAL January 2008
Characteristics of Black Liquor Sprays from Gas-Assisted Atomizers in High-Temperature Environments, TAPPI JOURNAL January 2008