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Journal articles
Open Access
An interview with a visionary - W. Craig McClelland, CEO, Union Camp Corp., TAPPI JOURNAL, July 1997, Vol. 80(7)

An interview with a visionary - w. craig mcClelland, ceo, union camp corp., TAPPI JOURNAL, July 1997, Vol. 80(7)

Journal articles
Open Access
Automatic Lubrication on a Printing Press, TAPPI JOURNAL, February 1997, Vol. 80(2)

Automatic Lubrication on a Printing Press, TAPPI JOURNAL, February 1997, Vol. 80(2)

Journal articles
Magazine articles
Open Access
Eucalyptus black liquor properties in a lignin extraction process: density, dry solids, viscosity, inorganic, and organic content, TAPPI Journal March 2023

ABSTRACT: Extracting lignin from black liquor is becoming more common, although only a few research papers discuss the impact of the process on the liquor’s primary properties. This work aims to determine the changes in black liquor properties as it undergoes a lignin extraction process using carbon dioxide (CO2). A diluted eucalyptus black liquor sample (DBL) was acidified with CO2 to a final pH of 8.5. After filtration, the kraft lignin was removed, and the filtrated lignin lean black liquor (LLBL) was collected. Five acidified black liquors (ABL) samples were collected during acidification at pH 10.5; 10.0; 9.5; 9.0; and 8.5. The samples were analyzed regarding lignin content in solution, sodium carbonate (Na2CO3), sodium sulfate (Na2SO4), density, dry solids content, and viscosity. While Na2SO4 remained almost constant, Na2CO3 presented an enormous increase in its concentration when comparing DBL with LLBL. As pH decreased, the lignin content in the solution was also reduced due to lignin precipitation. The results showed similar behavior for dry solids, density, and viscosity of the supernatant, but an increase in density was observed around pH 9.00. In light of this, the density of LLBL turns out to be closer to the one in the initial DBL. The significant increase in carbonate content could explain this behavior during acidification with CO2 once the inorganic content significantly influences the property. The viscosity was determined from 10 s-1 to 2000 s-1. We observed a Newtonian behavior for all samples. The increase in carbonate content in the sample is crucial information to the recovery cycle, especially for calculating the mass and energy balance when targeting the use of the LLBL.

Journal articles
Open Access
Three-Dimensional Observation of Coated Paper by Confocal Laser Scanning Microscope, TAPPI JOURNAL, February 2006, Vol. 5(2) (393 KB)

Three-Dimensional Observation of Coated Paper by Confocal Laser Scanning Microscope, TAPPI JOURNAL, February 2006, Vol. 5(2) (393 KB)

Journal articles
Open Access
Industrial gypsum as a coating pigment, TAPPI JOURNAL, December 1990, Vol. 73(12)

Industrial gypsum as a coating pigment, TAPPI JOURNAL, December 1990, Vol. 73(12)

Journal articles
Open Access
Modern newsprint machines served by automated single-drum winders, TAPPI JOURNAL May 1989

Modern newsprint machines served by automated single-drum winders, TAPPI JOURNAL May 1989

Journal articles
Open Access
Dynamic thickness and temperature measurements during wet pressing and impulse drying, TAPPI JOURNAL, July 2002 (92KB)

Dynamic thickness and temperature measurements during wet pressing and impulse drying, Solutions! & TAPPI JOURNAL, July 2002 (92KB)

Journal articles
Open Access
The dagbladet full-scale printing trials part 2: print-quality evaluation by subjective comparison and image analysis, TAPPI JOURNAL, April 1994, Vol. 77(4)

The dagbladet full-scale printing trials part 2: print-quality evaluation by subjective comparison and image analysis, TAPPI JOURNAL, April 1994, Vol. 77(4)

Journal articles
Open Access
An instrumental determination of the effect of sheet formati

An instrumental determination of the effect of sheet formation on the printability of uncoated fine paper, TAPPI JOURNAL, October 2006

Journal articles
Open Access
A tour of Scandinavian research facilities sparks ideas for cooperation, TAPPI JOURNAL, January 1998, Vol. 81(1)

A tour of scandinavian research facilities sparks ideas for cooperation, TAPPI JOURNAL, January 1998, Vol. 81(1)

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