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Fiber- and fine fractions-derived effects on pulp quality as a result of mechanical pulp refining consistency
- Source :
- Wood Science and Technology. 48:737-753
- Publication Year :
- 2014
- Publisher :
- Springer Science and Business Media LLC, 2014.
-
Abstract
- High-yield pulping of wood chips using low-consistency (LC) refining in combination with primary-stage high-consistency (HC) refining has previously been shown to produce paper with quality parameters (tensile strength and light-scattering coefficient) commonly targeted for newsprint with significantly less refining energy input than using only HC refining. However, questions remain on the differences in the refining action between the two refiner types and for high-yield pulping, the refiner energy demand is a crucial process parameter. Therefore, fines- and fiber-fraction development in HC and LC refining has been studied in detail using Bauer-McNett fractionation, and the respective tensile strengths of the different fractions have been compared. Quantitative and qualitative (morphological) characteristics of the isolated fine fractions have also been analyzed in detail using a newly developed automated fluorescence microscopy method and scanning electron microscopy. The results suggest the difference in LC/HC pulp properties (strength and optical) is partly derived from deviating fiber and fines morphologies and mass balances. The quality of the fines generated during HC and LC refining also differs. LC-refined pulps contain thinner fibrillar fines (thread-like) and HC-refined pulps broader fibrils such as lamellae-type fines. Flake-like fines from the outer fiber wall decreased in relative amount with energy input.
- Subjects :
- Materials science
Energy demand
Scanning electron microscope
Pulp (paper)
Forestry
Plant Science
Fractionation
Process variable
engineering.material
Industrial and Manufacturing Engineering
visual_art
Ultimate tensile strength
Newsprint
visual_art.visual_art_medium
engineering
General Materials Science
Composite material
Subjects
Details
- ISSN :
- 14325225 and 00437719
- Volume :
- 48
- Database :
- OpenAIRE
- Journal :
- Wood Science and Technology
- Accession number :
- edsair.doi...........806a264f1ec5ea6dd27fbdbbc541468c