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Comparison
of bonding strengths of the sapwoods and heartwoods of tree
species used in wooden shipboard building
Bulent
Kaygin and Ali Naci Tankut*
Bartin University, Faculty of Forestry, Department of Forest
Industrial Engineering, Bartin, 74100, Turkey.
*Corresponding author. Email:
ali_tankut@yahoo.com.
Fax: +90 378 227 74 21. Tel: +90 536 854 09 62.
Accepted 20 October, 2008 |
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The aim of this study is to determine how tree species,
their sapwood-to-heartwood ratios, adhesive type, and
environmental conditions affect the bonding strength of the
wood material. The bonding strengths formed by joining the
sapwood and heartwood of chestnut (Castanea sativa
Mill.), oak (Quercus petrea L.) and Scotch
pine (Pinus sylvestris L.) with polyurethane, epoxy,
and resorcinol formaldehyde adhesives are the focus of the
study since these wood species and adhesives are used
extensively in Turkey. The results of the study indicated
that oak has the best bonding strength performance for all
environmental conditions. It was determined that the bonding
strengths of the sapwood specimens were higher than the
bonding strength of the heartwood specimens for all
environmental conditions. The best bonding strength was
obtained by using the resorcinol formaldehyde adhesive, and
this was followed by the epoxy and polyurethane adhesives
for all environmental conditions. There were apparent
decreases in the bonding strengths for all of the tree
species and adhesives when the environmental conditions were
more severe.
Key words:
Adhesives for wood, epoxy, polyurethane, resorcinol
formaldehyde, lap-shear. |
