Microfibril angles of softwood and hardwood pulp fibres

Sabine Heinemann, Elias Retulainen

Research output: Contribution to conferenceConference PosterScientific

Abstract

The general relationship between the stress-strain behaviour and MFA of fibres is a well-known fact but little is known about variations within a single fibre or the effect of refining. Therefore, a simple method to determine MFA of selected single fibres is required. Polarimetry with a transmitted light microscope was applied on earlywood, latewood, and compression wood fibres from Norway spruce and Scots pine. Both reference pulps and refined pulps were considered. Hardwood fibres from eucalyptus pulp that have not yet been investigated to a larger extent were also measured. The MFA is determined from the light intensity peak of fibres between crossed Nichols that are turned gradually within the specimen plane, perpendicularly to the light beam, by 180° (Fig. 1). For intensity evaluation, the ZEN software by Zeiss was used providing very small measuring spots. Thus, fibre wall parts of special interest, e.g. areas close to damages, could be investigated.
Original languageEnglish
Pages56-57
Publication statusPublished - 2014
EventCOST Action FP1105 Understanding wood cell wall structure, biopolymer interaction and composition: Implications for current products and new material innovation - Coimbra, Portugal
Duration: 8 May 20149 May 2014

Workshop

WorkshopCOST Action FP1105 Understanding wood cell wall structure, biopolymer interaction and composition
CountryPortugal
CityCoimbra
Period8/05/149/05/14

Fingerprint

pulp fiber
softwood
hardwood
pulp
compression wood
earlywood
wood fibers
latewood
refining
light microscopes
Eucalyptus
Pinus sylvestris
Picea abies
light intensity
methodology

Keywords

  • pulp fibres
  • microfibril angle
  • MFA
  • measurement

Cite this

Heinemann, S., & Retulainen, E. (2014). Microfibril angles of softwood and hardwood pulp fibres. 56-57. Poster session presented at COST Action FP1105 Understanding wood cell wall structure, biopolymer interaction and composition, Coimbra, Portugal.
Heinemann, Sabine ; Retulainen, Elias. / Microfibril angles of softwood and hardwood pulp fibres. Poster session presented at COST Action FP1105 Understanding wood cell wall structure, biopolymer interaction and composition, Coimbra, Portugal.
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Heinemann, S & Retulainen, E 2014, 'Microfibril angles of softwood and hardwood pulp fibres' COST Action FP1105 Understanding wood cell wall structure, biopolymer interaction and composition, Coimbra, Portugal, 8/05/14 - 9/05/14, pp. 56-57.

Microfibril angles of softwood and hardwood pulp fibres. / Heinemann, Sabine; Retulainen, Elias.

2014. 56-57 Poster session presented at COST Action FP1105 Understanding wood cell wall structure, biopolymer interaction and composition, Coimbra, Portugal.

Research output: Contribution to conferenceConference PosterScientific

TY - CONF

T1 - Microfibril angles of softwood and hardwood pulp fibres

AU - Heinemann, Sabine

AU - Retulainen, Elias

N1 - Project code: 74054

PY - 2014

Y1 - 2014

N2 - The general relationship between the stress-strain behaviour and MFA of fibres is a well-known fact but little is known about variations within a single fibre or the effect of refining. Therefore, a simple method to determine MFA of selected single fibres is required. Polarimetry with a transmitted light microscope was applied on earlywood, latewood, and compression wood fibres from Norway spruce and Scots pine. Both reference pulps and refined pulps were considered. Hardwood fibres from eucalyptus pulp that have not yet been investigated to a larger extent were also measured. The MFA is determined from the light intensity peak of fibres between crossed Nichols that are turned gradually within the specimen plane, perpendicularly to the light beam, by 180° (Fig. 1). For intensity evaluation, the ZEN software by Zeiss was used providing very small measuring spots. Thus, fibre wall parts of special interest, e.g. areas close to damages, could be investigated.

AB - The general relationship between the stress-strain behaviour and MFA of fibres is a well-known fact but little is known about variations within a single fibre or the effect of refining. Therefore, a simple method to determine MFA of selected single fibres is required. Polarimetry with a transmitted light microscope was applied on earlywood, latewood, and compression wood fibres from Norway spruce and Scots pine. Both reference pulps and refined pulps were considered. Hardwood fibres from eucalyptus pulp that have not yet been investigated to a larger extent were also measured. The MFA is determined from the light intensity peak of fibres between crossed Nichols that are turned gradually within the specimen plane, perpendicularly to the light beam, by 180° (Fig. 1). For intensity evaluation, the ZEN software by Zeiss was used providing very small measuring spots. Thus, fibre wall parts of special interest, e.g. areas close to damages, could be investigated.

KW - pulp fibres

KW - microfibril angle

KW - MFA

KW - measurement

M3 - Conference Poster

SP - 56

EP - 57

ER -

Heinemann S, Retulainen E. Microfibril angles of softwood and hardwood pulp fibres. 2014. Poster session presented at COST Action FP1105 Understanding wood cell wall structure, biopolymer interaction and composition, Coimbra, Portugal.