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Rotational Position of Curved Saw Logs and Warp of the Sawn Timber
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
SP Trä.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
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2014 (English)In: Wood Material Science & Engineering, ISSN 1748-0272, E-ISSN 1748-0280, Vol. 9, no 1, p. 31-39Article in journal (Refereed) Published
Abstract [en]

With the development of scanning technology in sawmills, it is possible to optimise log rotational position when sawing. However, choosing a different rotational position than horns down might be detrimental for the board shape after drying, especially for curved logs. Thus, there is a need to investigate at what level of log curve it is possible to freely rotate logs without causing board warp. This study was carried out through a test sawing that was conducted at a sawmill situated in the middle of Sweden. The tests were made on 177 Norway spruce logs, with varying amount of curve. Half of the logs were sawn in the horns-down position, half were sawn rotated perpendicular to horns down. Log shape and warp of the dried boards were measured. The results indicated a relationship between board spring, log curve and choice of rotational position. Furthermore, board bow was related to log curve but not rotational position. It can be concluded that for straight logs, with a bow height of less than 15 mm, an unconventional rotational position does not cause excess spring in the boards. Bow and twist are not affected by the rotational position at all.

Place, publisher, year, edition, pages
2014. Vol. 9, no 1, p. 31-39
National Category
Other Mechanical Engineering
Research subject
Wood Technology
Identifiers
URN: urn:nbn:se:ltu:diva-8548DOI: 10.1080/17480272.2013.853691Scopus ID: 2-s2.0-84895057522Local ID: 710048c1-b647-47c1-8421-8b76d055d0c9OAI: oai:DiVA.org:ltu-8548DiVA, id: diva2:981486
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Validerad; 2014; 20130410 (magfre)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Fredriksson, MagnusBroman, OlofAxelsson, AnnAh Shenga, Pedro

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