Relation between fibre flexibility and cross-sectional properties

Marius Rusu (Corresponding Author), Kathrin Mörseburg, Øyvind Gregersen, Asuka Yamakawa, Sari Liukkonen

Research output: Contribution to journalArticleScientificpeer-review

13 Citations (Scopus)

Abstract

The correlation between the fibre flexibility and cross-sectional area moment of inertia of thermomechanical pulp fibres was investigated. The main effects of refining were found to be internal fibrillation, external fibrillation, and fibre shortening. Internal fibrillation increases fibre flexibility and fibre collapsibility, improving fibre-to-fibre contact in a paper sheet. The raw materials used were pulps produced from six different Norway spruce logs and six different Scots pine logs, chosen in a manner that allowed variation of fibre wall thickness and fibril angle independently. Each wood sample was refined in four stages using a pressurized 12" Sprout Waldron single disc refiner. Fibre flexibility was assessed by FiberMaster bendability measurements. Fibre bendability was measured on the +48 Bauer McNett fractions of the twelve 2nd, 3rd, and 4th stage thermomechanical pulps (TMP). The fibre cross-sectional samples were imaged using scanning electron microscopy (SEM). An image analysis method to calculate the area moment of inertia of each fibre using numerical integration was developed. Fiber bendability increased with specific energy consumption for both wood species (spruce and pine) from the 2nd refining stage to the fourth refining stage. Spruce had a higher rate of bendability increase than pine upon refining. It was expected that fibres with a low area moment of inertia would result in higher bendability, but no such correlation was found for either spruce or pine. Fibre bendability increased with internal fibrillation, as assessed from Simons staining. These results imply that local damage of the fibre wall such as delaminations, kinks, and compressions was the main effect in increasing the flexibility through refining of TMP.
Original languageEnglish
Pages (from-to)641-655
JournalBioResources
Volume6
Issue number1
Publication statusPublished - 2011
MoE publication typeA1 Journal article-refereed

Fingerprint

Fibers
Formability
Refining
Thermomechanical pulp
inertia
fibre
Wood
delamination
Delamination
image analysis
Image analysis
Pulp
Raw materials
Compaction
Energy utilization
scanning electron microscopy
compression
refining
Scanning electron microscopy
damage

Keywords

  • Fibre bendability
  • area moment of inertia
  • mechanical pulp
  • internal fibrillation
  • fibre cross-sectional properties
  • image analysis

Cite this

Rusu, M., Mörseburg, K., Gregersen, Ø., Yamakawa, A., & Liukkonen, S. (2011). Relation between fibre flexibility and cross-sectional properties. BioResources, 6(1), 641-655.
Rusu, Marius ; Mörseburg, Kathrin ; Gregersen, Øyvind ; Yamakawa, Asuka ; Liukkonen, Sari. / Relation between fibre flexibility and cross-sectional properties. In: BioResources. 2011 ; Vol. 6, No. 1. pp. 641-655.
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Rusu, M, Mörseburg, K, Gregersen, Ø, Yamakawa, A & Liukkonen, S 2011, 'Relation between fibre flexibility and cross-sectional properties', BioResources, vol. 6, no. 1, pp. 641-655.

Relation between fibre flexibility and cross-sectional properties. / Rusu, Marius (Corresponding Author); Mörseburg, Kathrin; Gregersen, Øyvind; Yamakawa, Asuka; Liukkonen, Sari.

In: BioResources, Vol. 6, No. 1, 2011, p. 641-655.

Research output: Contribution to journalArticleScientificpeer-review

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AU - Mörseburg, Kathrin

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N2 - The correlation between the fibre flexibility and cross-sectional area moment of inertia of thermomechanical pulp fibres was investigated. The main effects of refining were found to be internal fibrillation, external fibrillation, and fibre shortening. Internal fibrillation increases fibre flexibility and fibre collapsibility, improving fibre-to-fibre contact in a paper sheet. The raw materials used were pulps produced from six different Norway spruce logs and six different Scots pine logs, chosen in a manner that allowed variation of fibre wall thickness and fibril angle independently. Each wood sample was refined in four stages using a pressurized 12" Sprout Waldron single disc refiner. Fibre flexibility was assessed by FiberMaster bendability measurements. Fibre bendability was measured on the +48 Bauer McNett fractions of the twelve 2nd, 3rd, and 4th stage thermomechanical pulps (TMP). The fibre cross-sectional samples were imaged using scanning electron microscopy (SEM). An image analysis method to calculate the area moment of inertia of each fibre using numerical integration was developed. Fiber bendability increased with specific energy consumption for both wood species (spruce and pine) from the 2nd refining stage to the fourth refining stage. Spruce had a higher rate of bendability increase than pine upon refining. It was expected that fibres with a low area moment of inertia would result in higher bendability, but no such correlation was found for either spruce or pine. Fibre bendability increased with internal fibrillation, as assessed from Simons staining. These results imply that local damage of the fibre wall such as delaminations, kinks, and compressions was the main effect in increasing the flexibility through refining of TMP.

AB - The correlation between the fibre flexibility and cross-sectional area moment of inertia of thermomechanical pulp fibres was investigated. The main effects of refining were found to be internal fibrillation, external fibrillation, and fibre shortening. Internal fibrillation increases fibre flexibility and fibre collapsibility, improving fibre-to-fibre contact in a paper sheet. The raw materials used were pulps produced from six different Norway spruce logs and six different Scots pine logs, chosen in a manner that allowed variation of fibre wall thickness and fibril angle independently. Each wood sample was refined in four stages using a pressurized 12" Sprout Waldron single disc refiner. Fibre flexibility was assessed by FiberMaster bendability measurements. Fibre bendability was measured on the +48 Bauer McNett fractions of the twelve 2nd, 3rd, and 4th stage thermomechanical pulps (TMP). The fibre cross-sectional samples were imaged using scanning electron microscopy (SEM). An image analysis method to calculate the area moment of inertia of each fibre using numerical integration was developed. Fiber bendability increased with specific energy consumption for both wood species (spruce and pine) from the 2nd refining stage to the fourth refining stage. Spruce had a higher rate of bendability increase than pine upon refining. It was expected that fibres with a low area moment of inertia would result in higher bendability, but no such correlation was found for either spruce or pine. Fibre bendability increased with internal fibrillation, as assessed from Simons staining. These results imply that local damage of the fibre wall such as delaminations, kinks, and compressions was the main effect in increasing the flexibility through refining of TMP.

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KW - area moment of inertia

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KW - internal fibrillation

KW - fibre cross-sectional properties

KW - image analysis

M3 - Article

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EP - 655

JO - BioResources

JF - BioResources

SN - 1930-2126

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ER -

Rusu M, Mörseburg K, Gregersen Ø, Yamakawa A, Liukkonen S. Relation between fibre flexibility and cross-sectional properties. BioResources. 2011;6(1):641-655.