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Journal articles
Open Access
A fast-track approach through the design and permit phases for an ash landfill, TAPPI JOURNAL August 1988

A fast-track approach through the design and permit phases for an ash landfill, TAPPI JOURNAL August 1988

Journal articles
Magazine articles
Open Access
Probing the molecular weights of sweetgum and pine kraft lignin fractions, TAPPI Journal June 2021

ABSTRACT: The present investigation undertook a systematic investigation of the molecular weight (MW) of kraft lignins throughout the pulping process to establish a correlation between MW and lignin recovery at different extents of the kraft pulping process. The evaluation of MW is crucial for lignin characterization and utilization, since it is known to influence the kinetics of lignin reactivity and its resultant physico-chemical properties. Sweetgum and pine lignins precipitated from black liquor at different pHs (9.5 and 2.5) and different extents of kraft pulping (30•150 min) were the subject of this effort. Gel permeation chromatography (GPC) was used to determine the number average molecular weight (Mn), mass average molecular weight (Mw), and polydispersity of the lignin samples. It was shown that the MW of lignins from both feedstocks follow gel degradation theory; that is, at the onset of the kraft pulping process low molecular weight-lignins were obtained, and as pulping progressed, the molecular weight peaked and subsequently decreased. An important finding was that acetobromination was shown to be a more effective derivatization technique for carbohydrates containing lignins than acetylation, the technique typically used for derivatization of lignin.

Journal articles
Open Access
Fibers properties and tearing resistance, TAPPI JOURNAL February 1988 88FEB103

Fibers properties and tearing resistance, TAPPI JOURNAL February 1988

Journal articles
Magazine articles
Open Access
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.

Journal articles
Magazine articles
Open Access
Editor's Note: An Ideal Raw Material for Pulp and Paper, TAP

Editor's Note: An Ideal Raw Material for Pulp and Paper, TAPPI JOURNAL March 2010

Journal articles
Open Access
Evaluation of Various Mechanical Pulping Processes for Mature and Juvenile Loblolly Pine in Lightweight Coated Paper, TAPPI JOURNAL March 2009

Evaluation of Various Mechanical Pulping Processes for Mature and Juvenile Loblolly Pine in Lightweight Coated Paper, TAPPI JOURNAL March 2009

Journal articles
Open Access
Linking Pulp Variations to TMP Operation by Better Selection

Linking Pulp Variations to TMP Operation by Better Selection and Treatment of Process Data

Journal articles
Open Access
Stracel: A modern european mill in France, TAPPI JOURNAL, June 1997, Vol. 80(6)

Stracel: a modern european mill in france, TAPPI JOURNAL, June 1997, Vol. 80(6)

Journal articles
Open Access
A preliminary study of kenaf fiber bundles and their composite cells, TAPPI JOURNAL, August 1997, Vol. 80(8)

A preliminary study of kenaf fiber bundles and their composite cells, TAPPI JOURNAL, August 1997, Vol. 80(8)

Journal articles
Open Access
What's next for greater prosperity?, TAPPI JOURNAL, April 1998, Vol. 81(4)

What's next for greater prosperity?, TAPPI JOURNAL, April 1998, Vol. 81(4)

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