Utvärdering av deplacementmetod med vatten för bestämning av träets torrdensitet.
1996 (Swedish)Report (Other academic)
Evaluation of the deplacement method with water for determination of dry wood density.
by Staffan Carlsson, Stephan Eskilander and Dick Sandberg
A new method (SP-method) for determination of wood density at 12 % moisture content has been developted at the Swedish National testing and Research Institute (SP). The method is a futher development of the deplacement method with water as. The volume of the specimens is determined with use of Archimeds principle. The specimen is immersed in water and a computer program compensate for errors in the measurement as a result of wateruptake in the specimen.
This investigation describes the correlation between the dry density of wood, determined by the SP-method and a "traditional" method. Traditional method means that the dimensions of the specimen are measured with a slide-calliper in order to calculate the volume of the specimen. The test materials were taken from Scots pine and Norway spruce with dimension 40 x 60 x 120 mm.
The results show a difference less than 3 % between dry density determined by the two methods. The correlation coefficient (R2) was 0.99 when linear regression was used. Repetition test showed mean deviation of 0.2 % when dry density for same specimens were determined two times with the SP-method.
Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 1996. , 16 p.
, TRITA-TRÄ R-96-21, ISSN 1104-2117 ; 21
Wood, Density, Scots pine, Norway spruce, deplacement
densitet, trä, deplacement, mätteknik, gran, furu
Research subject Technology (byts ev till Engineering), Forestry and Wood Technology
IdentifiersURN: urn:nbn:se:lnu:diva-20804ISRN: KTH/TRÄ/R--96/21--SEOAI: oai:DiVA.org:lnu-20804DiVA: diva2:541097