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Electromagnetic Shielding Properties of Woodceramics Made from Wastepaper

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Abstract

Woodceramics are new porous carbon materials, which are made by impregnating woody materials with phenol resin and then thermoformed in a vacuum furnace and these have been shown to have electromagnetic shielding properties. In the recycling of wastepaper, ways of using the wastepaper other than for paper pulp are needed to be developed. In this study, we made Woodceramics from handbill advertisement paper and telephone directory paper, and measured their electromagnetic shielding properties in order to find new uses for wastepaper. The results showed that the Woodceramics made from wastepaper had an electric shielding effectiveness of 30 dB for 100 MHz and 40 to 43 dB for 300 MHz or higher, and had a magnetic shielding effectiveness of 30 dB for 100 MHz and 37 dB for about 400 MHz. An electric equivalent circuit of the pore model in the Woodceramics is introduced. In addition, it is proposed that the excellent electromagnetic shielding effectiveness of the Woodceramics is caused by dielectric loss.

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Authors and Affiliations

  1. Aomori Polytechnic College, 171-2 Kitsuneno, Iizume, Gosyogawara, 037, Japan

    Kiyotaka Shibata

  2. Industrial Research Institute of Aomori Prefecture, 80 Fukuromachi, Hirosaki, 036, Japan

    Toshihiro Okabe & Kouji Saito

  3. Tokyo University of Agriculture and Technology, 3-5-8 Saiwai-cho, Fuchu, Tokyo, 183, Japan

    Takayuki Okayama

  4. Industrial Research Institute of Tokyo Prefecture, 3-13-10 Nishigaoka, Kita-ku, Tokyo, 115, Japan

    Masahiro Shimada

  5. Nikkan Sports Logitem, 7-8-5 Tsukiji, Chuo-ku, Tokyo, 104, Japan

    Akira Yamamura

  6. Institute of Industrial Science, University of Tokyo, 7-22-1 Roppongi, Minato-ku, Tokyo, 106, Japan

    Ryoichi Yamamoto

Authors
  1. Kiyotaka Shibata
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  2. Toshihiro Okabe
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  3. Kouji Saito
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  4. Takayuki Okayama
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  5. Masahiro Shimada
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  6. Akira Yamamura
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  7. Ryoichi Yamamoto
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Shibata, K., Okabe, T., Saito, K. et al. Electromagnetic Shielding Properties of Woodceramics Made from Wastepaper. Journal of Porous Materials 4, 269–275 (1997). https://doi.org/10.1023/A:1009625322670

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  • DOI: https://doi.org/10.1023/A:1009625322670

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