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Spiral grain in Norway spruce: constant change in grain angle in Scandinavian sawlogs
Norwegian Forest Research Institute, Norway. (Department of Economy, Technology and Processing)
Växjö University, Faculty of Mathematics/Science/Technology, Institutionen för industriella produktionssystem. (School of industrial engeneering)
North Tröndelag Research Institute, Norway.
2002 (English)In: Forestry (London), ISSN 0015-752X, E-ISSN 1464-3626, Vol. 75, no 2, p. 163-170Article in journal (Refereed) Published
Abstract [en]

Any evident grain deviation will reduce strength and increase warp in sawn timber. To describe the magnitude and variance of grain angle in Norway spruce, specimens from 1046 Norwegian sawlogs and 380 logs from Sweden and Finland were examined. For individual specimens, grain angle outside the innermost zone closest to the pith might be expressed by a simple linear function of radial distance from the pith. The intercept and inclination of this function are close to bivariate normally distributed with mean values (SD) of 2.7° mm−1 (1.9) and −0.039° mm−1 (0.037), respectively. Inclination is less negative for wider annual rings (r = 0.3), and intercept and inclination are negatively correlated (r = −0.4). The constant rate of change indicates inherited property rather than influence of any dynamic, external stimulus. No predictor for grain angle pattern was found. The linear model leads to simplifications both when observing the grain angle in the forestry, and in calculations of strength properties and distortion in the timber industry.

Place, publisher, year, edition, pages
Oxford University Press, 2002. Vol. 75, no 2, p. 163-170
Keywords [en]
change in grain angle, mature wood, Norway spruce, slope of grain, spiral grain
National Category
Forest Science
Research subject
Technology (byts ev till Engineering), Forestry and Wood Technology
Identifiers
URN: urn:nbn:se:lnu:diva-33836DOI: 10.1093/forestry/75.2.163OAI: oai:DiVA.org:lnu-33836DiVA, id: diva2:711650
Available from: 2014-04-10 Created: 2014-04-10 Last updated: 2017-12-05Bibliographically approved

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Säll, Harald

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf