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Paper Information

Journal:   IRANIAN JOURNAL OF WOOD AND PAPER SCIENCE RESEARCH   fall 2018 , Volume 33 , Number 3 (64) #g00642; Page(s) 417 To 427.

Correlation between vessel features and hardwood drying properties; case study: beech (Fagus orientalis) and oak (Quercus castaneifolia) woods

Author(s):  Ebrahimi M., Tarmian A., OLADI R.
In this research, the effects of vessel features, including vessel diameter, density and porosity on drying rate and casehardening of beech (Fagus Orientalis) and oak (Quercus castaneifolia) woods was investigated. For this purpose, flat-sawn boards with the dimensions of 170×50×80 mm (L×T×R) were cut from the sapwood and then were dried in laboratory kiln at 50˚ C and 50 % relative humidity to final moisture content of 8%. After drying, the severity of casehardening of dried boards was measured using prong test. For anatomical studies and measuring the vessel features, white chalk and black marker method was used and scanned sections were analyzed using Image J. Pearson correlation was applied between vessel features and drying properties using SPSS software. Results showed that vessel proportion and porosity have pronounced effect on the drying rate compared to vessel diameter and the latter feature can be ignored. It was revealed that even though the oak wood vessel diameter is larger, but drying rate in the free-water domain for oak wood was lower compared to beech wood. Results also showed that correlation between casehardening and vessel diameter was significantly positive. However, a negative correlation was observed between porosity and casehardening.
Keyword(s): Vessel,hardwood,drying rate,casehardening,vessel features,Pearson correlation
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