Multiscale modeling and multiobjective control of wood fiber morphology in batch pulp digester

AIChE Journal ◽  
2020 ◽  
Vol 66 (7) ◽  
Author(s):  
Hyun‐Kyu Choi ◽  
Joseph S.‐I. Kwon
Keyword(s):  
Multiscale Modeling ◽  
Wood Fiber ◽  
Fiber Morphology ◽  
Multiobjective Control ◽  
Pulp Digester

SEM Study of Tension Wood Fiber Morphology and its Effect on Paper Properties

1977 ◽  
Vol 35 ◽  
pp. 308-309
Author(s):  
K. W. Robinson
Keyword(s):  
Tension Wood ◽  
Wood Fiber ◽  
Strength Properties ◽  
Fiber Morphology ◽  
Paper Properties ◽  
Pure Cellulose ◽  
Short Rotation ◽  
Hardwood Trees ◽  
Sem Study

Tension wood (TW) is an abnormal tissue of hardwood trees; although it has been isolated from most parts of the tree, it is frequently found on the upper side of branches and leaning stems. TW has been classically associated with geotropic alignment, but more recently it has been associated with fast growth. Paper made from TW is generally lower in strength properties. Consequently, the paper industries' growing dependence on fast growing, short- rotation trees will result in higher amounts of TW in the final product and a corresponding reduction in strength.Relatively few studies have dealt with the role of TW in the structure of paper. It was suggested that the lower strength properties of TW were due to a combination of factors, namely, its unique morphology, compression failures in the cell wall, and lower hemicellulose content. Central to the unique morphology of the TW fiber is the thick gelatinous layer (G-layer) composed almost entirely of pure cellulose.

scholarly journals Potential of C. citriodora wood species for kraft pulp production

TAPPI Journal ◽  
2016 ◽  
Vol 15 (3) ◽  
pp. 159-164 ◽  
Author(s):  
Tiago Segura ◽  
Francides Da Silva, Jr.
Keyword(s):  
Wood Species ◽  
Lignin Content ◽  
Wood Fiber ◽  
Eucalyptus Grandis ◽  
Basic Density ◽  
Wood Chip ◽  
Kappa Number ◽  
Fiber Morphology ◽  
Tissue Paper ◽  
Pulp Production

This work characterizes the wood from Corymbia citriodora for pulp production. We evaluated wood chip samples from an 8-year-old C. citriodora plantation. A sample of Eucalyptus grandis x Eucalyptus urophylla chips from a 7-year-old plantation was used as reference material. Wood fiber morphology and chemical composition were analyzed. A modified kraft pulping was carried out to achieve kappa 18 on brownstock pulps. After that, pulps were oxygen delignified, and then underwent elemental chlorine free (ECF) bleaching to achieve the target brightness of 90±0.5% ISO. The bleached pulps were refined in a PFI mill at 0, 750, 1500, and 3000 revolutions, and their physical-mechanical properties were analyzed. C. citriodora wood had a relatively high wood basic density (0.568 g/cm³), low lignin content (22.3%), and high holocellulose content (73.1%) compared with E. grandis x E. urophylla. The fibers of this species had 1.07 mm length, 16.1 μm width, and 66% wall fraction, which reflect its high basic density. For the same kappa number, C. citriodora and E. grandis x E. urophylla yields were similar – the main pulping highlight for this wood species is the low specific wood consumption – 2.93 m³/a.d. ton. C. citriodora pulp had a relatively lower kappa number after oxygen delignification and lower bleaching chemical demand than Eucalyptus pulp. C. citriodora pulp had a high specific volume and capillarity, and low water retention value. The physical properties of C. citriodora suggest that it might be suitable for use in tissue paper manufacturing.

Micro and Macromorphology of Recycled Fiber and Wood

1992 ◽  
Vol 266 ◽  
Author(s):  
Douglas D. Stokke
Keyword(s):  
Wood Fiber ◽  
Morphological Characteristics ◽  
Wood Products ◽  
Raw Material ◽  
Wood Fibers ◽  
Fiber Morphology ◽  
Fiber Plastic ◽  
Recycled Fiber ◽  
Secondary Wood ◽  
Composite Properties

AbstractWood is a major industrial raw material, with U.S. consumption approaching that of aluminum, plastics, cement, and steel combined. Partially as a result of the magnitude of wood and wood products in use, these products constitute a substantial portion of the solid waste stream. In order to reduce the amount of wood and wood fiber disposed in landfills, efforts to recycle these materials into useful products such as structural composites are needed. The success of such conversion depends in part on knowledge of the morphological characteristics of various sources of secondary wood and wood fibers, and the influence of wood element morphology on composite properties. An overview of wood and fiber morphology representative of major sources of secondary material is provided, with a discussion of how these morphological features may influence the properties of conventional wood composites and wood fiber/plastic composites.

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