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Analysis of laboratory beating by fiber settling time frequency distributions, TAPPI JOURNAL, November 2003, Vol. 2(11) (105KB)

Analysis of laboratory beating by fiber settling time frequency distributions, Solutions! & TAPPI JOURNAL, November 2003, Vol. 2(11) (105KB)

Current status of the pure oxygen activated sludge process in Canadian mills, TAPPI JOURNAL, November 2003, Vol. 2(11) (124KB)

Current status of the pure oxygen activated sludge process in Canadian mills, Solutions! & TAPPI JOURNAL, November 2003, Vol. 2(11) (124KB)

Measuring softwood yield gain at kraft pulp mills, Journal of Pulp and Paper Science, November 2003, Vol. 29(11) (327KB)

Measuring softwood yield gain at kraft pulp mills, Journal of Pulp and Paper Science, November 2003, Vol. 29(11) (327KB)

Virtual bleach plants, Part 3: Caustic extraction and peroxide bleaching models, TAPPI JOURNAL, October 2003, Vol. 2(10) (280KB)

Virtual bleach plants, Part 3: Caustic extraction and peroxide bleaching models, Solutions! & TAPPI JOURNAL, October 2003, Vol. 2(10) (280KB)

Papermaking properties and morphology of cellulose fiber recovered from municipal solid waste, TAPPI JOURNAL, October 2003, Vol. 2(10) (320KB)

Papermaking properties and morphology of cellulose fiber recovered from municipal solid waste, TAPPI JOURNAL, October 2003, Vol. 2(10) (320KB)

Fast determination of anionic groups in different pulp fiber by methylene blue sorption, Solutions! & TAPPI JOURNAL, October 2003, Vol. 2(10) (115KB)

Fast determination of anionic groups in different pulp fiber by methylene blue sorption, Solutions! & TAPPI JOURNAL, October 2003, Vol. 2(10) (115KB)

The role of hornification in the deterioration mechanism of physical properties of unrefined eucalyptus fibers during paper recycling, TAPPI Journal February 2024

ABSTRACT: Physical properties of cellulosic paper deteriorate significantly during paper recycling, which hinders the sustainable development of the paper industry. This work investigates the property deterioration mechanism and the role of hornification in the recycling process of unrefined eucalyptus fibers. The results showed that during the recycling process, the hornification gradually deepened, the fiber width gradually decreased, and the physical properties of the paper also gradually decreased. After five cycles of reuse, the relative bonding area decreased by 17.6%, while the relative bonding force decreased by 1.8%. Further results indicated that the physical property deterioration of the paper was closely related to the decrease of fiber bonding area. The fiber bonding area decreased linearly with the reduction of re-swollen fiber width during paper recycling. Re-swollen fiber width was closely related to the hornification. Hornification mainly reduces the bonding area of unrefined eucalyptus fiber rather than the bonding force. The work elucidates the role of hornification in the recycling process of unrefined eucalyptus fibers and the deterioration mechanism of paper physical properties, which will be helpful to control the property deterioration of paper and achieve a longer life cycle.

World’s Most Northerly Paper Mill Makes Sustainable Choices, Paper360º January/February 2024

TAPPI Journal Summaries, Paper360º January/February 2024

Effects of different soda loss measurement techniques on brownstock quality, TAPPI Journal July 2024

ABSTRACT: The efficiency of the kraft recovery plant, bleaching process, and paper machine are affected when black liquor carryover from the brownstock washers is not controlled well. Measuring soda loss within a mill can vary from using conductivity, either in-situ or with a lab sample of black liquor filtrate squeezed from the last stage washer, to measuring absolute sodium content with a lab sodium specific ion probe or spectrophotometer. While measuring conductivity has value in tracking trends in black liquor losses, it is not an acceptable method in reporting losses in absolute units, typically in lb/ton of pulp. This is further complicated when trying to benchmark soda loss performance across a fleet of mills with multiple washer lines. Not only do the testing methods vary, but the amount of bound soda on high kappa pulps can be significant. This variability creates inconsistent results, and studies are needed to understand the effect of different testing methods on the pulp quality. In this study, soda loss is expressed as sodium sulfate (Na2SO4). Four different methods to measure soda content in pulp off commercial brownstock washers were studied: full digestion (FD), washing soaking overnight and washing (WSW), soaking in boiling water and stirring 10-min (SW-10), and squeeze-no wash (Sq). Total, washable, and bound sodium sulfate calculations were determined for each soda content measuring technique using inductively coupled plasma-optical emission spectroscopy (ICP-OES). Results showed bound and washable sodium sulfate amounts significantly depend on which soda measurement technique was used. In addition, the soda results were correlated with the pulp kappa numbers. As the kappa number increases, bound soda increases, regardless of the soda measurement method used. Impacts of high sodium sulfate in brownstock are also discussed.