| Summary: | 碩士 === 國立臺灣大學 === 森林學研究所 === 91 === The purpose of this study was to investigate the manufacture of Japanese cedar . First, we soaked the materials with various PF concentration to make resin content of the materials 54.9%，62.0%，86.7%，90.5% and 92.1% separately. Then the materials were carbonized under various conditions that carbonization temperature increased from 300℃ to 1100℃ with every 100℃ an interval and the rates of temperature raising was 1℃/min，2℃/min，5℃/min differently. The basic properties of carbon yields，shrinkage rate，soft-x-ray irradiance，electrical resistivity，element yields and specific surface area of carbonized materials were also investigated in the research.
Furthermore, environmental such usage absorption ability for the free formaldehyde and toxic gas by carbonized materials has also been studied. Finally, the goal of this research was the new usage functions of recycle materials.
The results of this research are that the carbon yields of carbonized materials are decreasing with when the increasing carbonization temperature . It decreased rapidly when the temperature was between 300~600℃. The shrinkage rate of carbonized materials increased with increasing carbonization temperature. It became stable when the temperature was higher above 800℃. The shrinkage rate of carbonized materials were 3~23% and 12~30% for parallel to surface direction and for vertical to thickness direction respectively.
The X-ray peak irradiation of carbonized materials approximately occurred at 18。. The peak of carbon approached to 24。 when the carbonization temperature increased. The element carbon yields approximately was 84% when the carbonization temperature was higher above 900℃. The most suitable temperature of carbonization of free formaldehyde absorption ability was 800℃ in Japanese cedar woodceramics. Under this condition, it can effectively reduce formaldehyde consistency 11.31%. The secondary was at 1000℃and the absorbility also get above 10%. Others were not so good and the absorbility of them were under 10%.
The carbonization material at carbonization temperature of 500℃ had the best absorption ability of toxic gas NH3. However, the effect of the rate of temperature rise and resin contents showed in the experiment had no significant impact. The carbonization material at carbonization temperature of 1100℃had the better absorption ability of toxic gas SO2.
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