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Magazine articles
Displacement washing of softwood pulp cooked to various levels of residual lignin content, TAPPI Journal September 2021
ABSTRACT: This study investigates the influence of the degree of delignification of kraft spruce pulp cooked at seven different kappa numbers, ranging from 18.1 to 50.1, on the efficiency of displacement washing under laboratory conditions. Although the pulp bed is a polydispersive and heterogeneous system, the correlation dependence of the wash yield and bed efficiency on the Péclet number and the kappa number of the pulp showed that washing efficiency increased not only with an increasing Péclet number, but also with an increasing kappa number. The linear dependence between the mean residence time of the solute lignin in the bed and the space time, which reflects the residence time of the wash liquid in the pulp bed, was found for all levels of the kappa number. Washing also reduced the kappa number and the residual lignin content in the pulp fibers.
Journal articles
Magazine articles
Effects of phosphogypsum whiskers modification with calcium stearate and their impacts on properties of bleached softwood paper sheets, TAPPI Journal September 2021
ABSTRACT: By combining the structural properties and characteristics of phosphogypsum whiskers, a preliminary study on the modification of phosphogypsum whiskers and their application in papermaking was carried out. The effects of reaction temperature, reaction time, and reaction concentration on the solubility and retention of modified phosphogypsum whiskers and the effects of phosphogypsum whiskers on the physical properties of paper under different modified conditions were explored. The research results show that, after the phosphogypsum whiskers are modified with calcium stearate, a coating layer will be formed on the surface of the whiskers, which effectively reduces the solubility of the phosphogypsum whiskers. The best modification conditions are: the amount of calcium stearate relative to the absolute dry mass of the phosphogypsum whisker is 2.00%; the modification time is 30 min, and the modification temperature is 60°C. The use of modified phosphogypsum whiskers for paper filling will slightly reduce the whiteness, folding resistance, burst resistance, and tensile strength of the paper, but the tearing degree and retention of the filler will be increased to some extent.
Magazine articles
Editorial: Scott Rosencrance: Technical innovator, TAPPI JOU
Editorial: Scott Rosencrance: Technical innovator, TAPPI JOURNAL January 2013
Magazine articles
Editor's Note: Collecting industry information that counts,
Editor's Note: Collecting industry information that counts, TAPPI JOURNAL April 2010
Magazine articles
Editor's Note: Monstrous marvels, TAPPI JOURNAL September 20
Editor's Note: Monstrous marvels, TAPPI JOURNAL September 2010
Magazine articles
Editorial: Mentoring For the Future, TAPPI JOURNAL February
Editorial: Mentoring For the Future, TAPPI JOURNAL February 2011
Magazine articles
Editor's Note: Bill Fuller's TAPPI JOURNAL Enthusiasm, TAPPI
Editor's Note: Bill Fuller's TAPPI JOURNAL Enthusiasm, TAPPI JOURNAL July 2011
Magazine articles
Editor's Note: TAPPI JOURNAL's Best Paper for 2010, TAPPI JO
Editor's Note: TAPPI JOURNAL's Best Paper for 2010, TAPPI JOURNAL March 2011
Magazine articles
Guest Editorial: Forest biorefinery: The next century of inn
Guest Editorial: Forest biorefinery: The next century of innovation, TAPPI JOURNAL May 2011
Magazine articles
Guest Commentary: Forests and biofuels: An opportunity for p
Guest Commentary: Forests and biofuels: An opportunity for public-private partnering, TAPPI JOURNAL May 2011