Linking visual and stress wave grading of beech wood from the log to the sawmill product

Straže, Aleš (author), Plavčak, Denis (author), Žveplan, Ervin (author), Gorišek, Željko (author)

The quality potential and possibilities of using beech logs and sawn wood was investigated. Twenty-seven beech logs, with a mean diameter of 48 cm, were cut from 10 trees from a Hacquetio epipactidis-Fagetum site in SE Slovenia. The trees were pre-selected according to the national 5-level quality scale for forest stand evaluation, using two trees per class. Beech logs were classified according to the EN 1316-1 and sawn afterwards into unedged boards of 35 mm nominal thickness. Altogether, 250 boards were visually graded according to the rules of the European Organisation of the Sawmill Industry (EOS). Longitudinal vibration of logs and boards with the determination of stress wave velocity by MTG timber grader was additionally included into the quality assessment. In the case of logs, we confirmed significance of the relationship between visually assessed log quality and stress wave velocity. The stress wave velocity in logs was also related to the stress wave velocity in boards, where it varied considerably, especially for low-graded material. In the case of sawn wood, the relationship between sawn wood grade and stress wave velocity was insignificant. The research confirmed the possibility of presorting of logs, visually or non-destructively, for better classification and utilization of sawn timber.

• Language: English
• Keywords: beech, quality control, logs, sawnwood, visual assessment, stress wave grading
• Work type: Article
• Typology: 1.08 - Published Scientific Conference Contribution
• Organization: BF - Biotechnical Faculty
• Publication status: Published
• Publication version: Version of Record
• Year: 2021
• Number of pages: 6 str.
• Numbering: Vol. 3, iss. 1, art. 65
• PID: 20.500.12556/RUL-135244
• UDC: 630*8
• ISSN on article: 2673-4931
• DOI: 10.3390/IECF2020-08450
• COBISS.SI-ID: 52769795
• Publication date in RUL: 02.03.2022

Record is a part of a journal

• Title: Environmental sciences proceedings
• Shortened title: Environ. sci. proc.
• Publisher: MDPI
• ISSN: 2673-4931
• COBISS.SI-ID: 52763907

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
• Licensing start date: 01.01.2021

Secondary language

• Language: Slovenian
• Keywords: bukev, kakovost kontrole, žagan les, vizualno ocenjevanje