The effect of wet pressing and drying on bonding and activation in paper

Vainio, Anna; Paulapuro, Hannu

doi:10.3183/npprj-2007-22-04-p403-408

Cited by 16 publications

(20 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition to this, the PHB‐BC pellicles were dried freely in air instead being of wet‐pressed. This will induce slack in the BC network, resulting in a poorer tensile modulus of the BC network, which the authors measured to be only 1.87 ± 0.5 GPa as opposed to 12.5 GPa (Table ).…”

Section: Recent Advances Of Bc In Advanced Fiber Compositesmentioning

confidence: 99%

More Than Meets the Eye in Bacterial Cellulose: Biosynthesis, Bioprocessing, and Applications in Advanced Fiber Composites

et al. 2013

View full text Add to dashboard Cite

Bacterial cellulose (BC) nanofibers are one of the stiffest organic materials produced by nature. It consists of pure cellulose without the impurities that are commonly found in plant-based cellulose. This review discusses the metabolic pathways of cellulose-producing bacteria and the genetic pathways of Acetobacter xylinum. The fermentative production of BC and the bioprocess parameters for the cultivation of bacteria are also discussed. The influence of the composition of the culture medium, pH, temperature, and oxygen content on the morphology and yield of BC are reviewed. In addition, the progress made to date on the genetic modification of bacteria to increase the yield of BC and the large-scale production of BC using various bioreactors, namely static and agitated cultures, stirred tank, airlift, aerosol, rotary, and membrane reactors, is reviewed. The challenges in commercial scale production of BC are thoroughly discussed and the efficiency of various bioreactors is compared. In terms of the application of BC, particular emphasis is placed on the utilization of BC in advanced fiber composites to manufacture the next generation truly green, sustainable and renewable hierarchical composites.

show abstract

Section: Recent Advances Of Bc In Advanced Fiber Compositesmentioning

confidence: 99%

More Than Meets the Eye in Bacterial Cellulose: Biosynthesis, Bioprocessing, and Applications in Advanced Fiber Composites

et al. 2013

View full text Add to dashboard Cite

show abstract

“…Effects of wet-pressing on paper strength are profound (Back 1987;Vainio and Paulapuro 2007a;Wan et al 2011). As noted by Back (1987), pressing of dry paper, as in a calendering operation, usually has little beneficial effect on strength, if at all.…”

Section: Wet-pressing Advances Affecting Paper Strengthmentioning

confidence: 99%

Prospects for Maintaining Strength of Paper and Paperboard Products While Using Less Forest Resources: A Review

Hubbe¹

2013

BioResources

View full text Add to dashboard Cite

Paper production requires large amounts of cellulosic fiber, whereas the world's forested lands and croplands have a finite capacity to supply such resources. To deal with likely future pressure on forest resources, as well as to hold down costs of materials, publications examined in the preparation of this review suggest that the paper industry will need to implement several concurrent strategies. In particular, the industry can be expected to view recycling as a central part of its activities. Basis weights of various paper-based products can be expected to decrease over the coming decades, and more of the fiber content will be replaced with fillers such as calcium carbonate. Such trends will place intense demands upon chemical-based strategies to enhance the bonding within paper and paperboard. Based on the literature, further progress in reducing the amount of new forest resources used to meet a given set of paper product requirements will require a combined approach, taking into account various fiber attributes, nanostructures, novel concepts in bond formation, and advances in the unit operations of papermaking.

show abstract

“…It has been believed that the increased strength due to the fines is originated from the bridging fibers, high bonding area, and increased surface area [10][11][12][13]. Generally fines increase apparent surface area resulting in the increased light scattering coefficient and opacity.…”

Section: Introductionmentioning

confidence: 99%