Economic value of optical and X-ray CT scanning in bucking of Scots pine

Hannu Rummukainen (Corresponding Author), Marika Makkonen, Jori Uusitalo

Research output: Contribution to journalArticleScientificpeer-review

Abstract

In the Nordic countries, trees are typically bucked into logs using harvesters that measure only a two-dimensional diameter profile of the stem. Because the value of a log can vary significantly depending on its shape and internal defects, bucking decisions can in principle be improved by optical scanning of the three-dimensional stem shape, and detection of knots and other features inside the stem by X-ray computed tomography (CT). The objective of this study was to quantify how much the value recovery at a sawmill could be increased, if bucking decisions took advantage of additional measurement data and a sawing simulator to estimate log values. A simulation study on 1582 Scots pine stems was performed to compare bucking based on a two-dimensional diameter profile with bucking that maximises log value based on either optical scanning alone, or both optical and CT scanning. For log positioning, both the traditional “horns-down” position, and value-maximising rotation based on CT scanning were considered. The results show that bucking based on optical scanning alone can potentially increase the value of sawn timber by up to 5%, and CT scanning before bucking provides little additional value for a sawmill using a CT scanner to optimise log rotation.
Original languageEnglish
JournalWood Material Science and Engineering
DOIs
Publication statusE-pub ahead of print - 3 Oct 2019
MoE publication typeA1 Journal article-refereed

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Tomography
Scanning
X rays
Economics
Sawmills
Sawing
Harvesters
Timber
Simulators
Recovery
Defects

Keywords

  • Bucking optimisation
  • CT scanning
  • log positioning
  • sawing simulation
  • value recovery

Cite this

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title = "Economic value of optical and X-ray CT scanning in bucking of Scots pine",
abstract = "In the Nordic countries, trees are typically bucked into logs using harvesters that measure only a two-dimensional diameter profile of the stem. Because the value of a log can vary significantly depending on its shape and internal defects, bucking decisions can in principle be improved by optical scanning of the three-dimensional stem shape, and detection of knots and other features inside the stem by X-ray computed tomography (CT). The objective of this study was to quantify how much the value recovery at a sawmill could be increased, if bucking decisions took advantage of additional measurement data and a sawing simulator to estimate log values. A simulation study on 1582 Scots pine stems was performed to compare bucking based on a two-dimensional diameter profile with bucking that maximises log value based on either optical scanning alone, or both optical and CT scanning. For log positioning, both the traditional “horns-down” position, and value-maximising rotation based on CT scanning were considered. The results show that bucking based on optical scanning alone can potentially increase the value of sawn timber by up to 5{\%}, and CT scanning before bucking provides little additional value for a sawmill using a CT scanner to optimise log rotation.",
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Economic value of optical and X-ray CT scanning in bucking of Scots pine. / Rummukainen, Hannu (Corresponding Author); Makkonen, Marika; Uusitalo, Jori.

In: Wood Material Science and Engineering, 03.10.2019.

Research output: Contribution to journalArticleScientificpeer-review

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