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Journal articles
Magazine articles
Open Access
Critical parameters for tall oil separation I: The importance of ration of fatty acids to rosin acids, TAPPI Journal September 2019

ABSTRACT: Tall oil is a valuable byproduct in chemical pulping of wood, and its fractions have a large spectrum of applications as chemical precursors, detergents, and fuel. High recovery of tall oil is important for the economic and environmental profile of chemical pulp mills. The purpose of this study was to investigate critical parameters of tall oil separation from black liquor. To investigate this in a controlled way, we developed a model test system using a “synthetic” black liquor (active cooking chemicals OH- and HS- ions), a complete process for soap skimming, and determination of recovered tall oil based on solvent extraction and colorimetric analysis, with good reproducibility. We used the developed system to study the effect of the ratio of fatty acids to rosin acids on tall oil separation. When high amounts of rosin acids were present, tall oil recovery was low, while high content of fatty acids above 60% significantly promoted tall oil separation. Therefore, manipulating the content of fatty acids in black liquor before the soap skimming step can significantly affect the tall oil solubility, and hence its separation. The findings open up chemical ways to improve the tall oil yield.

Journal articles
Magazine articles
Open Access
A new technique for the measurement of show-through mottle of fine paper, TAPPI Journal September 2019

ABSTRACT: Mottling within print-through and show-through is caused by the variability of the local optical properties of the sheet. This mottling is visually disturbing and a mark of poor paper quality. The ability to predict print-through mottle of printed paper by measuring show-through mottle on the unprinted sheet would be a valuable asset for paper machine control.We examined the relationship between print-through mottle and show-through mottle. We worked with nine samples of 60 lb. uncoated fine paper (90 g/m2), from various North American paper companies, that were printed on an offset press, 400K (400% Black), on both sides. A show-through mottle instrumental determination technique was developed using an existing Fast Fourier Transform-based algorithm. The nine samples examined were ranked similarly by the visual evaluation of print-through mottle and by the instrumental determination of show-through mottle. We thus established that show-through on the unprinted sheet can be used as a reliable predictor of print-through, therefore saving time and money for papermakers. We also found a significant two-sidedness in show-through for some of the samples.

Journal articles
Open Access
Genetic variation of juvenile wood properties in a loblolly pine progeny test, TAPPI JOURNAL, December 2003 (235KB)

Genetic variation of juvenile wood properties in a loblolly pine progeny test, Solutions! & TAPPI JOURNAL, December 2003 (235KB)

Journal articles
Open Access
Influence of impulse drying on the retention and sizing of paper with alkyl ketene dimer, TAPPI JOURNAL, February 2003, Vol. 2(2) (136KB)

Influence of impulse drying on the retention and sizing of paper with alkyl ketene dimer, Solutions! & TAPPI JOURNAL, February 2003, Vol. 2(2) (136KB)

Journal articles
Open Access
Internet based, interactive simulation: the concept and an evaporator example, TAPPI JOURNAL, February 2003, Vol. 2(2) (147KB)

Internet based, interactive simulation: the concept and an evaporator example, Solutions! & TAPPI JOURNAL, February 2003, Vol. 2(2) (147KB)

Journal articles
Open Access
Modeling of Bagginess Due to Storage of Paper Reels With Ridges, TAPPI JOURNAL September 2009

Modeling of Bagginess Due to Storage of Paper Reels With Ridges, TAPPI JOURNAL September 2009

Journal articles
Open Access
Application of Imaging Reflectometry to Studies of Print Mottle on Commercially Printed Coated Papers, TAPPI JOURNAL January 2008

Application of Imaging Reflectometry to Studies of Print Mottle on Commercially Printed Coated Papers, TAPPI JOURNAL January 2008

Journal articles
Open Access
Applications of tension and nip load profile measurement using a novel roll mounted electret film sensor, TAPPI JOURNAL April 2010

Applications of tension and nip load profile measurement using a novel roll mounted electret film sensor, TAPPI JOURNAL April 2010

Journal articles
Open Access
Effects of impregnation time on hardwood kraft pulp characteristics and papermaking potential â?¢ a mill study, TAPPI JOURNAL April 2010

Effects of impregnation time on hardwood kraft pulp characteristics and papermaking potential • a mill study, TAPPI JOURNAL April 2010

Journal articles
Open Access
Starch-modified fillers for linerboard and paper grades: A perspective review, TAPPI JOURNAL April 2010

Starch-modified fillers for linerboard and paper grades: A perspective review, TAPPI JOURNAL April 2010

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