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Journal articles
Developing a New Paradigm for Linerboard Fillers, TAPPI JOURNAL March 2008
Developing a New Paradigm for Linerboard Fillers, TAPPI JOURNAL March 2008
Journal articles
Magazine articles
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
Magazine articles
Quantification of vegetable oil in recycled paper, TAPPI JOURNAL September 2020
ABSTRACT: Vegetable soybean oil is commonly used in cooking foods that are packaged in takeaway paper-board containers. Vegetable oil is hydrophobic, and in sufficiently high concentration, could interfere with interfiber bonding and result in paper strength loss. In order to quantify the effect of oil on the resulting paperboard strength, it is necessary to quantify the oil content in paper. A lab method was evaluated to determine the soybean oil content in paper. Handsheets were made with pulps previously treated with different proportions of vegetable oil. Pyrolysis gas chromatography-mass spectrometry (pyGCMS) was used to quantify the amount of oil left in the handsheets. The results revealed a strong correlation between the amount of oil applied to the initial pulp and the amount of oil left in the handsheets.In addition, the effect of vegetable oils on paper strength may be affected by the cooking process. Vegetable oil is known to degrade over time in the presence of oxygen, light, and temperature. The vegetable oil was put in an oven to imitate the oil lifecycle during a typical pizza cooking process. The cooked oil was then left at room temperature and not protected from air (oxygen) or from normal daylight. The heated, then cooled, oil was stored over a period of 13 weeks. During this time, samples of the aged oil were tested as part of a time-based degradation study of the cooked and cooled oil.
Journal articles
Magazine articles
TAPPI Journal Summaries, Paper360º September/October 2020
TAPPI Journal Summaries, Paper360º September/October 2020
Conference papers
How to Enhance the Performance of a Coated Roll Wrapper When
How to Enhance the Performance of a Coated Roll Wrapper When the Temperature Emitter Used is an Infrared Station, 1999 Finishing & Converting Conference Proceedings
Conference papers
Moisture Gradient Calendering for Multinip Applications, 199
Moisture Gradient Calendering for Multinip Applications, 1999 Finishing & Converting Conference Proceedings
Conference papers
Flexible System of Discharging, Handling, Packaging and Stac
Flexible System of Discharging, Handling, Packaging and Stacking of Reams that are Discharged Directly from a Folio Sheeter, 1999 Finishing & Converting Conference Proceedings
Conference papers
Winder Wisdom, 1999 Finishing & Converting Conference Procee
Winder Wisdom, 1999 Finishing & Converting Conference Proceedings
Conference papers
Using EDI and Barcoding to Track Rolls, 1999 Finishing & Con
Using EDI and Barcoding to Track Rolls, 1999 Finishing & Converting Conference Proceedings
Conference papers
Paper Mill Results on the Application and Implementation of
Paper Mill Results on the Application and Implementation of High-Temperature Supercalendering of Coated Paper, 1999 Finishing & Converting Conference Proceedings