Change search
CiteExportLink to record
Permanent link

Direct link
Cite
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
Predicting the strength of sawn wood products: A comparison between X-ray scanning of logs and machine strength grading of lumber
SP - Sveriges provnings- och forskningsinstitut, Trätek.
SP - Sveriges provnings- och forskningsinstitut, Trätek.
SP - Sveriges provnings- och forskningsinstitut, Trätek.
2005 (English)In: Forest products journal, ISSN 0015-7473, Vol. 55, no 9, p. 55-60Article in journal (Refereed)
Abstract [en]

For a long time, process improvements in sawmills have focused on high productivity measured in volume per hour and volume recovery. As sawmills become increasingly efficient, the importance of focusing on value recovery becomes obvious. In order to maximize value recovery, sawmills need the ability to sort logs according to properties such as strength. The aim of this study was to compare the results of predicting the strength of center boards based on x-ray scanning of logs with the results obtained by machine strength grading using a bending machine. The study was based on 131 Norway spruce (Picea abies (L.) Karst.) sawlogs that were scanned with an x-ray LogScanner and then sawn into boards. The bending stiffness of the center boards was tested using a strength-grading machine, and the bending strength was tested according to EN 408. Models for prediction of bending strength based on machine strength grading and x-ray LogScanner measurements were calibrated using partial least squares regression. The study showed that the x-ray LogScanner (r2 = 0.44) and machine strength grading (r2 = 0.43) had similar accuracy in predicting bending strength. The combination of both methods resulted in significantly higher accuracy (r2 = 0.56). The root mean square error (RMSE) was 8.5 MPa for the bending machine, 8.4 MPa for the x-ray LogScanner, and 7.4 MPa for the combination of both methods. Consequently, the combination is an interesting alternative. Future studies should include a larger number of boards and focus on the effect of log carriers and on finding the reasons behind outliers.

Place, publisher, year, edition, pages
2005. Vol. 55, no 9, p. 55-60
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-5918Local ID: 6059OAI: oai:DiVA.org:ri-5918DiVA, id: diva2:963752
Available from: 2016-09-08 Created: 2016-09-08 Last updated: 2017-11-21Bibliographically approved

Open Access in DiVA

No full text in DiVA

By organisation
SP - Sveriges provnings- och forskningsinstitut, Trätek
In the same journal
Forest products journal
Natural Sciences

Search outside of DiVA

GoogleGoogle Scholar

urn-nbn

Altmetric score

urn-nbn
Total: 10 hits
CiteExportLink to record
Permanent link

Direct link
Cite
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
v. 2.35.7