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Journal articles
Influence of forming conditions on fiber tilt, TAPPI JOURNAL April 2013
Influence of forming conditions on fiber tilt, TAPPI JOURNAL April 2013
Journal articles
Magazine articles
Soybean peroxidase treatment of ultra-high kappa softwood pulp to enhance yield and physical properties, TAPPI Journal September 2020
ABSTRACT: The working hypothesis serving as basis for this study is that pulping to a higher kappa number will produce a higher yield pulp, and then treating that pulp with a surface reactive lignin peroxidase to ablate surface lignin will increase specific bonding area. In the present case, the working hypothesis was modified so that soybean peroxidase (SBP) works like lignin peroxidase to modify surface lignin on high-kappa, high-yield softwood pulps to facilitate enhanced fiber-to-fiber bonding such that the resulting paper strength is similar to the lower kappa soft-wood pulp generally used to make linerboard. Soybean peroxidase is actually a plant peroxidase that exhibits lignin peroxidase-like activity. It is not a lignin peroxidase derived from white rot fungus. The current work did show a significant improvement in pulp yield (62.2% vs. 55.2% yield for a 103-kappa control linerboard grade sheet), while treatment with SBP showed that tensile, burst, and STFI properties of the pulp were improved, although more convincing data needs to be obtained.
Journal articles
Magazine articles
Lignin carbohydrate complex studies during kraft pulping for producing paper grade pulp from birch, TAPPI Journal September 2020
ABSTRACT: Paper grade pulp production across the globe is dominated by the kraft process using different lignocellulosic raw materials. Delignification is achieved around 90% using different chemical treatments. A bottleneck for complete delignification is the presence of residual covalent bonds that prevail between lignin and carbohydrate even after severe chemical pulping and oxygen delignification steps. Different covalent bonds are present in native wood that sustain drastic pulping conditions. In this study, 100% birch wood was used for producing paper grade pulp, and the lignin carbohydrate bonds were analyzed at different stages of the kraft cook. The lignin carbohydrate bonds that were responsible for residual lignin retention in unbleached pulp were compared and analyzed with the original lignin-carbohydrate complex (LCC) bonds in native birch wood. It was shown that lignin remaining after pulping and oxygen delignification was mainly bound to xylan, whereas the lignin bound to glucomannan was for the most part degraded.
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
A stop at AP's Burnie Mill, TAPPI JOURNAL, September 1996, Vol. 79(9)
A stop at ap's burnie mill, TAPPI JOURNAL, September 1996, Vol. 79(9)
Journal articles
Pulp Safari 96, TAPPI JOURNAL, September 1996, Vol. 79(9)
Pulp safari 96, TAPPI JOURNAL, September 1996, Vol. 79(9)
Journal articles
Opacity, smoothness, and toughness of mechanical printing papers: the effect of softwood kraft pulp properties, TAPPI JOURNAL, April 1997, Vol. 80(4)
Opacity, smoothness, and toughness of mechanical printing papers: the effect of softwood kraft pulp properties, TAPPI JOURNAL, April 1997, Vol. 80(4)
Journal articles
Strength properties of woodâ?? pe composites: influence of pulp ratio and pretreatment of pe fibers, TAPPI JOURNAL, April 1997, Vol. 80(4)
Strength properties of wood– pe composites: influence of pulp ratio and pretreatment of pe fibers, TAPPI JOURNAL, April 1997, Vol. 80(4)
Journal articles
Flocculants for precipitated calcium carbonate in newsprint pulps, TAPPI JOURNAL, April 1997, Vol. 80(4)
Flocculants for precipitated calcium carbonate in newsprint pulps, TAPPI JOURNAL, April 1997, Vol. 80(4)
Journal articles
Fiber-to-water distribution of stickies, TAPPI JOURNAL, April 1997, Vol. 80(4)
Fiber-to-water distribution of stickies, TAPPI JOURNAL, April 1997, Vol. 80(4)