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Machining and related characteristics of five wood species from Bayanga region (Central African Republic) : final technical report YO-FS-89-JB-55
Torelli, Niko ; Stewart, Harold A.
The research represents an applied continuation of the study "Research on physical and mechanical properties of tropical wood species" completed in 1977. In accordance with ANSI/ ASTM D 1666-64 ...(Reapproved 1976) and Davis (1962), the working properties (planning, turning, shaping, boring) and nail and screw splitting tendency of nine Central African tree species: Albizzia adianthifolia, Blighia welwitschii, Celtis zenkeri, Detarium macrocarpum, Gilbertiodendron dewevrei, Irvingia gabinensis, Manilkara fouilloyana, Pachyleasma tessmannii and Xylopia hypolampsa were tested and compared with beechwood (Fagus sylvatica) and poplar wood (Populus nigra). Swelling and sorption properties were measured according to DIN 52 184 for the species enumerated above and the other 22 species: Albizzia sp., Anthostema aubryanum, Combretodendron africanum, Croton aubrevillei, Desplatsia floribunda, Dracaena mannii, Gambea beguei, Gambea boukokoensis, Ficus sp., Macarnaga barteri, Marquesia excelsa, Marinda lucida, Oldfieldia africana, Parkia filicoidea, Polyalthia suaveolens, Rauvolfia macrophylla, Stemonocoleus micranthus, Swartzia fistuloides, Tesmannia africana, Tesmania lescrauwaetii, Treculia africana, Tridesmodestemon emphalocarpoides from the first study. Five species were given preliminary testing to establish the possibility of producing peeled (Albizzia adianthifolia, Celtis zenkeri, Gilbertiodendron dewevrei, Pachyleasma tessmannii) and sliced veneer (Detarium macrocarpum, Gilbertiodendron dewevrei, Pachyleasma tessmannii). The deterioration resistance of the species Albizzia adianthifolia, Gilbertiodendron dewevrei and Irvingia gabonensis was evaluated according to ANSI/ ASTM D 2017-71 (Reapproved 1978). The study was commissioned by the U.S. - Yugoslav Joint Board on Scientific and Technological Cooperation and funded equally by the Science and Education Administration of SR Slovenia and the United States Department of Agriculture of the United States of America. The study was carried out with great help from the company "Slovenijales" or "Slovenia Bois" in the Central African Republic, who provided heavy mechanization in the field, its sawmill and veneer plant in Bayanga and finally the possibility of transport of wood to Slovenia. The Utensilia company and the carpenter cooperative in Vič, Ljubljana, made it possible to use the machines to conduct individual machinability tests. Cooperating scientist Harold A. Stewart of the Forestry Sciences Laboratory, Forest Service USDA, Southern Illinois University, Carbondale, U.S.A., gave us valuable advices in the final stage of the project during his visit to Ljubljana.
Type of material - research report
; adult, serious
Publication and manufacture - Ljubljana : Biotechnical faculty, Department of wood science & technology, 1983
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