Equilibrium moisture contents (EMC) of wood species are very necessary in
the utilization of these in service. This study investigated the EMC of five
lesser utilized species of Ghana and compared it with that of three European species. Sixteen randomly sampled specimens of each
of the eight species (heartwood and sapwood) with dimensions 3 cm × 3 cm × 3 cm were exposed
at various relative humidity conditions of 30%, 45%, 60%, 75% and 90% in a
temperature and humidity-controlled climate chamber at a temperature of 25°C in accordance to German standard DIN 52182.
The species are Albies alba, Fagus
sylvatica and Picea abies which
are European species and Amphimas pterocarpoides, Antiaris toxicaria, Canarium schweinfurthii, Celtis
zenkeri and Cola gigantea are wood species from Ghana. Internal wood
temperature and humidity were measured with datalogger.
Samples were considered to have
reached equilibrium at any given humidity when the daily weight changes
were less than 0.1 mg according to German standard DIN 52183. After the last
measurements of the weight changes, the samples were dried at
References
[1]
Skaar, C. (1988) Wood-Water Relations. Springer, Berlin, 281. https://doi.org/10.1007/978-3-642-73683-4
[2]
Eaton, R.A. and Hale, M.D.C. (1993) Wood Decay, Pests and Protection. Chapman and Hall, University Printing House, Cambridge, 313.
[3]
Schmidt, O. (2006) Wood and Tree Fungi: Biology, Damage, Protection, and Use. Springer-Verlag, Heidelberg, 334.
[4]
Kollman, F.F.P. and Cote, W.A. (1984) Principles of Wood Science and Technology. Volume 1: Solid Wood. Springer-Verlag, Berlin, Heidelberg, New York, Tokyo, 592 p.
[5]
Siau, J.F. (1995) Wood: Influence of Moisture on Physical Properties. Virginia Poly Institute and State University, Blacksburg.
[6]
Griffin D. M. (1977) Water Potential and Wood-Decay Fungi. Annual Review of Phytopathology, 15, 319-329. https://doi.org/10.1146/annurev.py.15.090177.001535
Skaar, C. (1994) Wood-Water Relations. Springer Series in Wood Science. Springer Science & Business Media.
[9]
Dinwoodie, J.M. (2000) Timber: Its Nature and Behaviour. E. & F.N. Spon, New York, 249.
[10]
Rydell, R. (1982) Samband mellan densitet ocharsningsbredd samt nagra andraeqenskapar for Svensk furu (The Connection between Density, Annual Ring Width and Some Other Properties of Swedish Pine). STFI-Meddelande Serie A No. 763 13-82 TS.
[11]
Hawthorne, W. (1990) Field Guide to the Forest Trees of Ghana. Ghana Forestry Series No. 1. Overseas Development Agency, London, 276 p.
[12]
Hawthorne, W.D. (1995) Ecological Profiles of Ghanaian Forest Trees. Tropical Forestry Papers 29, University of Oxford, Oxford, 345 p.
[13]
(1976) German Standard 52 182. Testing of Wood: Determination of Density. Fachnormenausschuβ Materialprüfung (FNM) im DIN Deutsches Institut für Normung e.V. Normenausschuβ Holz (NAHolz) im DIN. Ver lag GmbH, Berlin 30 und Köln. 3 p.
[14]
(1977) German Standard 52 183. Testing of Wood: Determination of Moisture Content. Fachnormenausschuβ Materialprüfung (FNM) im DIN Deutsches Institut für Normung e.V. Normenausschuβ Holz (NAHolz) im DIN. Ver lag GmbH, Berlin 30 und Köln. 2 p.
[15]
Haygreen, J.G. and Bowyer, J.L. (1996) Forest Products and Wood Science. 3rd Edition, Iowa State University Press, Iowa City, 243-247.
[16]
Kinnimonth, J.A. (1976) Effect of Timber Drying Temperature on Subsequent Moisture and Dimentional Changes. New Zealand Journal Forest Science, 6, 101-107.
Fengel, D. and Wegener, G. (1989) Wood—Chemistry, Ultrastructure, Reactions. 2nd Edition, Walter de Gruyter, Berlin.
[19]
Popper, R., Niemz P. and Eberle, G. (2001) The Strength and Dimensional Changes of Wood Based Composites along the Sorption Isotherm. Internal Report ETH/HW-HP/LfZP No. 1. Swiss Federal Institute of Technology, Zurich.