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Stående årsringar hos furu (Pinus silvestris L) och gran (Picea abies Karst).
Kukngliga Tekniska Högskolan. (Virkeslära)
1995 (Swedish)Report (Other academic)Alternative title
Vertical Annual Rings in Pine (Pinus silvestris L) and Spruce (Picea abies Karst) (English)
Abstract [en]

Vertical annual rings can be obtained from radially sawn timber. Compared to other annual ring directions timber with vertical annual rings have a number of advantages, like it is less susceptible to crack during drying and the moisture movements are uniform.

In this study a definition of vertical annual rings has been proposed. The definition is based on condition that the moisture movement of the width should not exceed ten percent, as a result of deviation from exactly vertical annual rings. According to the developed definition pine (Pinus silvestris L) and spruce (Picea abies Karst) are considered to have vertical annual ringsifthe angle between the flat side and the tangent to the annual ring at half the thickness is between 60 and 90 degrees. To avoid surface cracks one should take particular attention on the annual ring orientation in the surface of lumber with thicker dimensions.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 1995. , 7 p.
, TRITA-TRÄ R-95-13, ISSN 1104-2117 ; 13
Keyword [en]
sawing, StarSawing, pine, spruce, Pinus silvestris L., Picea abies Karst., quarter sawn timber, vertical annual rings, radial sawed
Keyword [sv]
stående årsringar, trä, deformationer, formstabilitet
National Category
Wood Science
Research subject
Technology (byts ev till Engineering), Forestry and Wood Technology
URN: urn:nbn:se:lnu:diva-20787ISRN: KTH/TRÄ/R--95/13--SEOAI: diva2:540968
Available from: 2012-08-28 Created: 2012-07-12 Last updated: 2012-08-28Bibliographically approved

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Sandberg, Dick
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