Results 221 to 230 of about 26,588 (265)
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Enhancing yield through high-kappa pulping
TAPPI Journal, 2014Chemical pulping consists of a collection of delignification reactions designed to remove amorphous lignin from the fiber matrix while preserving carbohydrates in a fibrous form. Commercially available cooking processes are relatively nonselective with reagents attaching both lignin and carbohydrates. Generally, the carbohydrates react more slowly than
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Refining of High-Yield Wood Pulp
Proceedings, annual meeting, Electron Microscopy Society of America, 1973As the supply of wood for paper and other wood fiber products constantly dwindles, the ensuing economic situation demands that wood pulping procedures be modified to provide higher yields of usable wood substance. Mechanical, semichemical, and strictly chemical methods are presently employed to reduce wood to its fibrous components.
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Improved pulp yield and strength by retained glucomannans in kraft pulping of softwood
Nordic Pulp & Paper Research Journal, 2015The possibilities of improving yield and strength properties of softwood bleached kraft pulps by retaining a higher content of glucomannan during kraft cooking using additives that decrease the rat ...
Lennart Salmén, Mikael Lindström
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Brightening of mechanical and high-yield pulps
TAPPI Journal, 2013This work lays out the general principles of the brightening of mechanical pulp. The author presents a practical discussion of the brightening processes for both reductive (sodium hydrosulfite or dithionite) and oxidative (hydrogen peroxide) chemicals. Each of these chemicals has its advantages, disadvantages, and most suitable applications.
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Journal of Wood Chemistry and Technology, 1999
A series of eleven cyclic and acyclic thiosulfinates was synthesized and applied onto hardwood BCTMP (bleached chemithermomechanical pulp) testsheets. Treated and untreated testsheets were photoaged and their optical property were monitored. The results of these photoaging experiments indicated that cyclic thiosulfinates were relatively ineffective at ...
Cang Li +2 more
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A series of eleven cyclic and acyclic thiosulfinates was synthesized and applied onto hardwood BCTMP (bleached chemithermomechanical pulp) testsheets. Treated and untreated testsheets were photoaged and their optical property were monitored. The results of these photoaging experiments indicated that cyclic thiosulfinates were relatively ineffective at ...
Cang Li +2 more
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The apparent yield stress of pulp fiber suspensions
Journal of Rheology, 2010The apparent yield stress is one of the most important rheological properties of pulp suspensions in designing process equipment for the pulp and paper industry. Therefore, determining a reliable apparent yield stress measurement technique is of importance, not only for pulp suspensions but for any fluid exhibiting yielding behavior.
Babak Derakhshandeh +2 more
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Multicriteria Optimization of a High‐Yield Pulping Process
The Canadian Journal of Chemical Engineering, 2002AbstractThis work deals with the application of a multicriteria optimization technique for the optimization of a jack pine pulping process, which has a large number of input and output variables. The optimization process is mainly comprised of two steps: reduction of the volume of the search space and determination of good compromise solutions.
Jules Thibault +3 more
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Evaluation of current methods to estimate pulp yield of hemp
Industrial Crops and Products, 1994Abstract Large-scale evaluation of hemp stems from field trials requires a rapid method for the characterization of stem quality. The large differences between bark and woody core in anatomical and chemical properties, make a quantification of these two fractions of primary importance for quality assessment. This paper evaluates accuracy and power of
de Meijer, E.P.M., van der Werf, H.M.G.
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Predicting pulp yield and pulp productivity ofEucalyptus dunniiusing acoustic techniques
Australian Forestry, 2010Summary The economics of kraft pulping are influenced by variation in wood density and chemistry, or their product, pulp productivity. The ability to predict basic density, pulp yield or pulp productivity before harvest would provide an economic advantage to the grower or processor.
Raymond, Carolyn A +2 more
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Improvement of high-yield pulp properties by using a small amount of bleached wheat straw pulp
Bioresource Technology, 2011In this study, the potential of using bleached wheat straw pulp (BWSP) was explored to improve the tensile strength of the high-yield pulp (HYP) while preserving its high bulk property. The results showed that with the addition of 5-10% refined BWSP, the HYP tensile strength can be increased by about 10-20% without sacrificing the bulk. Similar results
Hongjie, Zhang, Zhibin, He, Yonghao, Ni
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