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Anatomical Property , Physical Property of Betel Nut Trunk and its Manufacture Composites
The purpose of this study is to research the anatomical properties, physical properties of betel nut wood and manufacture of betel nut trunk composites. First, to observe the betel nut’s anatomical properties, and then try to find its utilization. After the tissue construction of betel nut trunk have been dissected then observing the tissues by different methods. The results obtained by this study may be summarized as follows: There is a large number of fibers in peripheral bundle sheaths for supporting the trunk. There is silica crystal, which is chain arrangement outside the bundle sheaths. Parenchyma in peripheral region is almost circular or oval-shaped, but parenchyma in central region is heterogeneous, and there is difference in its size. Betel nut trunk near the central region has higher moisture content than near the peripheral region. The moisture content in near the bottom and peripheral region of the trunk are the lowest. The upper of the trunk showing more smooth change in the moisture content. The strength of peripheral region of betel nut wood is lower than that of the woods of Pinus morrisonicola、Michelia compressa, which have the same values of specific gravity, because of the betel nut trunks lack the tranverse tissues. The results of multiple regression method show that the factors affecting the velocity of stress wave in betel nut wood are density and moisture content. During the period from green to F.S.P., the velocity of stress wave increases slowly, but it increases sharply when the moisture content is decreased below F.S.P.. Both cross sectional area and volumetric shrinkage percents will decrease obviously after the betel nut trunk is treated with PEG solution. Although the specimen soaked in hot PEG solution, it has the higher absorption, and exhibit the lower shrinkage of cross sectional area and volumetric shrinkage, yet its checked area percentage is higher than the specimen soaked in cold PEG solution. The outer particle of betel nut wood-HDPE compound has the obviously lower water absorption and thickness swelling. From the point of view of the mechanical properties, the compound made of wood particle and the outer particle of betel nut trunk has the higher MOR and MOE values.
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