Volymutbyte vid tillverkning av furulimfog från stjärnsågad trekantsprofil.
1997 (Swedish)Report (Other academic)Alternative title
Volume yield in manufacturing gluelam board of Scots pine from star-sawn triangular profiles. (English)
Volume yield in manufacturing gluelam board of Scots pine from star-sawn triangular profiles.
Triangular profiles from star-sawing have been used to produce knot free gluelam boards with radial surfaces and a length of 2.1 m. The volume yield has been evaluated in two different gluelam qualities. One was with finger joints and the other one without finger joints. The material used was 7.78 m3 triangular profiles of pine. The quality and dimension was sawfallen. The manufacture of the profiles has been carried out in five steps:
- Removal of knots and defects.
- Finger jointing of cut pieces.
- Planing of triangular profiles.
- Clueing of triangular profiles into blocks.
- Splitting the blocks into gluelam boards and finishing the surface.
The measurements comprises all steps except splitting and final finishing. These steps have been simulated theoretically.
The total volume yield was 53.8 %. In the process three operations were found to be critical for the result. They are: removal of knots and defects, planing and splitting of blocks and finishing. These operations account for more than 93 % of the total loss during manufacturing.
Removal of knots and defects resulted in 12,8 % loss of volume. 13 % of the manufactured blocks were without knots, defects and finger joints. The average length of the pieces after cutting was 0,41 m.
Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 1997. , 18 p.
, TRITA-TRÄ R-97-25, ISSN 1104-2117 ; 25
panel, wood, gluelam board, Star-sawing, finger-joint, volume yield, vertical annual rings, Scots pine, Pinus sylvestris
Stjärnsågning, fingerskarvning, stående årsringar, volymutbyte, furu, tall, trä, limning, limfog, skivor
Research subject Technology (byts ev till Engineering), Forestry and Wood Technology
IdentifiersURN: urn:nbn:se:lnu:diva-20901ISRN: KTH/TRÄ/R--97/25--SEOAI: oai:DiVA.org:lnu-20901DiVA: diva2:542037