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Journal articles
Computational model for water drainage in fourdrinier paper machines, TAPPI JOURNAL April 1988 88APR133
Computational model for water drainage in fourdrinier paper machines, TAPPI JOURNAL April 1988
Journal articles
Automotive nonwoven filter medial: their constructions and filter mechanisms, TAPPI JOURNAL April 1988 88APR161
Automotive nonwoven filter medial: their constructions and filter mechanisms, TAPPI JOURNAL April 1988
Journal articles
Use of fillers in papermaking, TAPPI JOURNAL April 1988 88APR77
Use of fillers in papermaking, TAPPI JOURNAL April 1988
Journal articles
James River improves performance, saves money with its corporate process control system maintenance program, TAPPI JOURNAL April 1988 88APR93
James River improves performance, saves money with its corporate process control system maintenance program, TAPPI JOURNAL April 1988
Journal articles
Analysis of paper machine performance, TAPPI JOURNAL April 1988 88APR97
Analysis of paper machine performance, TAPPI JOURNAL April 1988
Journal articles
A new generation of paper machine trim programs, TAPPI JOURNAL August 1988
A new generation of paper machine trim programs, TAPPI JOURNAL August 1988
Journal articles
The combination of highly charged polyelectrolytes with retention agents: retention in the presence of interfering substances, TAPPI JOURNAL August 1988
The combination of highly charged polyelectrolytes with retention agents: retention in the presence of interfering substances, TAPPI JOURNAL August 1988
Journal articles
Acid-insoluble and acid-soluble lignin characteristics in kraft pulping of hybrid salix clones, TAPPI JOURNAL August 1988
Acid-insoluble and acid-soluble lignin characteristics in kraft pulping of hybrid salix clones, TAPPI JOURNAL August 1988
Journal articles
Magazine articles
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
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.