The effect of mannan on physical properties on ECF bleached softwood kraft fibre handsheets

Anna Suurnäkki, Tarja Oksanen, Heikki Kettunen, Johanna Buchert

Research output: Contribution to journalArticleScientificpeer-review

26 Citations (Scopus)

Abstract

The role of surface mannan in ECF bleached softwood kraft pulp fibres was investigated by altering the mannan content of fibres by combined extensive enzymatic removal and chemical sorption methods. The effect of amount, structure and location of mannan in the fibres on physical properties of fibres was measured. Mannanase treatment was able to remove both native fibre galactoglucomannan and sorbed enzymatical- ly modified locust bean gum galactomannan from the fibres. Extensive chemical sorption of galactomannan seemed to occur preferably on the native galactoglucomannan present on the fibre surfaces. The amount, structure, composition and location of mannan in the fibres were found to influence the handsheet properties. The native fibre surface galactoglucomannan affected mainly the density of the fibres and thus the binding properties of the fibres. The sorption of modified galactomannan increased the WRV of fibres as expected and clearly increased the air resistance of the handsheets. Of the bonding strength properties, Scott Bond values correlated well with the amount of mannan located on the fibre surfaces whereas tensile strength was mostly affected by the total amount of mannan in the fibres.
Original languageEnglish
Pages (from-to)429-435
Number of pages7
JournalNordic Pulp and Paper Research Journal
Volume18
Issue number4
DOIs
Publication statusPublished - 2003
MoE publication typeA1 Journal article-refereed

Fingerprint

Mannans
Softwoods
softwood
physical properties
dietary fiber
Physical properties
physical property
Fibers
sorption
Sorption
fibre
effect
pulp fiber
beta-mannosidase
locust bean gum
kraft pulp
binding properties
tensile strength
locust
Kraft pulp

Keywords

  • ECF softwood kraft pulp fibres
  • Modification of mannan content
  • Mannanase
  • Sorption
  • Physical properties

Cite this

Suurnäkki, Anna ; Oksanen, Tarja ; Kettunen, Heikki ; Buchert, Johanna. / The effect of mannan on physical properties on ECF bleached softwood kraft fibre handsheets. In: Nordic Pulp and Paper Research Journal. 2003 ; Vol. 18, No. 4. pp. 429-435.
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abstract = "The role of surface mannan in ECF bleached softwood kraft pulp fibres was investigated by altering the mannan content of fibres by combined extensive enzymatic removal and chemical sorption methods. The effect of amount, structure and location of mannan in the fibres on physical properties of fibres was measured. Mannanase treatment was able to remove both native fibre galactoglucomannan and sorbed enzymatical- ly modified locust bean gum galactomannan from the fibres. Extensive chemical sorption of galactomannan seemed to occur preferably on the native galactoglucomannan present on the fibre surfaces. The amount, structure, composition and location of mannan in the fibres were found to influence the handsheet properties. The native fibre surface galactoglucomannan affected mainly the density of the fibres and thus the binding properties of the fibres. The sorption of modified galactomannan increased the WRV of fibres as expected and clearly increased the air resistance of the handsheets. Of the bonding strength properties, Scott Bond values correlated well with the amount of mannan located on the fibre surfaces whereas tensile strength was mostly affected by the total amount of mannan in the fibres.",
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The effect of mannan on physical properties on ECF bleached softwood kraft fibre handsheets. / Suurnäkki, Anna; Oksanen, Tarja; Kettunen, Heikki; Buchert, Johanna.

In: Nordic Pulp and Paper Research Journal, Vol. 18, No. 4, 2003, p. 429-435.

Research output: Contribution to journalArticleScientificpeer-review

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AB - The role of surface mannan in ECF bleached softwood kraft pulp fibres was investigated by altering the mannan content of fibres by combined extensive enzymatic removal and chemical sorption methods. The effect of amount, structure and location of mannan in the fibres on physical properties of fibres was measured. Mannanase treatment was able to remove both native fibre galactoglucomannan and sorbed enzymatical- ly modified locust bean gum galactomannan from the fibres. Extensive chemical sorption of galactomannan seemed to occur preferably on the native galactoglucomannan present on the fibre surfaces. The amount, structure, composition and location of mannan in the fibres were found to influence the handsheet properties. The native fibre surface galactoglucomannan affected mainly the density of the fibres and thus the binding properties of the fibres. The sorption of modified galactomannan increased the WRV of fibres as expected and clearly increased the air resistance of the handsheets. Of the bonding strength properties, Scott Bond values correlated well with the amount of mannan located on the fibre surfaces whereas tensile strength was mostly affected by the total amount of mannan in the fibres.

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