A Comparative Study on the Coefficient of Thermal Expansion of Solid and Laminated Wood Materials
Abstract
In this study, the coefficients of thermal expansion of solid wood and laminated wood materials prepared
from beech (Fagus orientalis L.), poplar (Populus x euramericana I-214) and eucalyptus (Eucalyptus grandis
W. Hill ex Maiden) species were determined. The experiments were made on the sapwood and heartwood of
solid wood material, separately. Laminated wood materials were produced from 3 mm thickness rotary peeled
veneer using UF (urea-formaldehyde) and PF (phenol-formaldehyde) adhesive. The tests were performed
between -10 and +40 ºC temperature interval. In tangential direction, the lowest coefficient of thermal expansion
was measured on the poplar heartwood (1.88x10–5 ºC–1) and the highest coefficient of thermal expansion was
measured on the laminated wood made from eucalyptus used PF (4.66x10–5 ºC–1). The results showed that
laminated materials produced from poplar wood has higher coefficient of thermal expansion than solid poplar
wood. The differences between solid and laminated wood from the beech and eucalyptus weren’t statistically
significant.
Keywords
The coefficient of thermal expansion,laminated material,solid wood material
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