木炭粉被覆木質複合板與木炭板在電場之電磁波屏蔽效應

Electromagnetic Shielding Efficiency at Electric Field of Oriented Strand Board Overlaid with Charcoal Powder and Charcoal Boards

蔡旭芳(Shiu-Fang Tsai) ； 王松永(Song-Yung Wang)

《林產工業》 21卷3期 (2002/09) Pp. 207-215

https://doi.org/10.6561/FPI.2002.21(3).7

摘要

本研究以市售相思樹木炭為原料，製作木炭板，進行不同製板條件對電磁波屏蔽效應（E. S. E）之影響。同時，亦探討高溫（1000℃）處理木炭板之電磁波屏蔽效應。再以泡桐木炭粉（炭化溫度1000℃）層積定向粒片板，探討木炭層厚度對其電磁波屏蔽效應之影響。所得結果歸納如次：（1）市售相思樹木炭粉所製作之木炭板之電磁波屏蔽效應均很低。經高溫（炭化溫度1000℃）處理之木炭板的電磁波屏蔽效應會昇高至24.4-49.5 dB。（2）由泡桐炭粉層（炭化溫度1000℃）層積複合於OSB表面所製成木質複合板，電磁波入射面為木炭層或OSB底面，其E .S. E值無差異，但其會隨複合之木炭層厚度增加而增大，木炭層厚度分別為0.2 cm，0.5 cm，及0.7 cm時，其E. S. E值分別為28.4 dB，54.2 dB及69.5 dB。（3）高溫處理木炭板之E. S. E值與其電阻係數（ρ）之間存在有曲線負相關。

關鍵字

市售木炭 ； 木炭板 ； 木炭粉被覆木質複合板 ； 電磁波屏蔽效應 ； 電阻係數

並列摘要

The charcoal boards made from commercial Acacia charcoal and the effects of manufacturing conditions on electromagnetic shielding efficiency (E. S. E) were investigated. The E. S. E values of charcoal boards treated at carbonization temperature of 1000℃ also were studied. Additionally, the wooden composite made from OSB (oriented strand board) overlaid with paulownia charcoal powder with carbonization temperature of 1000℃ and the effects of thickness of charcoal layers on E. S. E values were also investigated. The electromagnetic insulation strength system was to detect the electromagnetic shielding efficiency (E. S. E) of charcoal boards. The results are summarized as follows : (1)The E. S. E values of charcoal boards make from commercial Acacia charcoal powder were very low. However, the E.S.E values of charcoal boards treated at carbonization temperature of 1000℃ increased up to 24.4-49.5 dB. (2)The wooden composite made from OSB overlaid with paulownia charcoal powder layer under carbonization temperature of 1000℃, there were similar values of E. S. E for both irradiated face on charcoal layer and opposite OSB side. However, The E. S. E values increased with increasing thickness of charcoal layers thickness of 0.2 cm, 0.5 cm and 0.7 cm respectively. (3)The E.S.E values of charcoal boards treated at carbonization temperature of 1000℃ and its electric resistivity (ρ) could be represented by a negatively curvilinear relation

並列關鍵字

Commercial charcoal ； Charcoal board ； Wooden composite made from OSB overlaid with charcoal powder ； Electromagnetic shielding efficiency ； Electric resistivity