Use of relative density-based schedules in kiln-drying big-leafed mahogany (Swietenia macrophylla King) lumber
2008
Jara, A.A. | Bello, E.D. | Castillo, S.V.A. | Fernandez, V.A., Philippines Univ. Los Banos, College, Laguna (Philippines). Dept. of Forest Products and Paper Science | Madamba, P.S., Philippines Univ. Los Baños, College, Laguna (Philippines). Agricultural Bio-Process Div.
Kiln-drying experiments were conducted to determine the seasoning characteristics of and drying schedules for small-diameter plantation-grown big-leafed mahogany (Swietenia macrophylla King) based on its relative density. Three schedules of increasing degree of severity-recommended (T7-D3), severe (T8-D4) and accelerated (modified T9-D5) were used. The study showed evidence that small-diameter plantation-grown mahogany is easy to dry as illustrated by its fast drying rate and resulting minimum defects. The mahogany boards could be subjected to temperatures as high as 82.2 deg C without severe drying defects. The species is further characterized by low radial and tangential shrinkage. The severe (T8-D4) and accelerated (modified T9-D5) drying schedules appeared promising for 23-year old mahogany, resulting in shorter drying times and boards comparable in quality to those kiln-dried using the recommended schedule. However, case hardening and moisture content variation were observed in all the drying runs.
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