Wood-Plastic Composites Equipped with an Electromagnetic Wave Absorbing Function by Adding Magnetic Powder

• Miura Kenji

  Faculty of Engineering, Iwate University

• Sekino Noboru

  Faculty of Agriculture, Iwate University

• Kubota Kenji

  Faculty of Engineering, Iwate University

• Oka Hideo

  Faculty of Engineering, Iwate University

• Kobayashi Masahiko

  Forestry and Forest Products Research Institute

• Kiguchi Makoto

  Forestry and Forest Products Research Institute

• Ohtomo Yushin

  Air Water Ecoroca Inc.

Bibliographic Information

Other Title

• 電波吸収機能を有する磁性粉配合混練型WPC
• デンパ キュウシュウ キノウ オ ユウスル ジセイフン ハイゴウコンレンガタ WPC

Abstract

In order to provide wood-plastic composites (WPCs) with a GHz electromagnetic wave absorbing function, WPCs were manufactured by adding magnetic powder. The effect of increases in volume fraction of Mn-Zn magnetic powder on bending, hygroscopic, and electromagnetic characteristics of the WPCs were investigated and the electromagnetic wave absorbing performance was estimated, focusing especially on the effects of moisture on performance. The results showed that there was no deterioration in bending performance by either reducing the volume fraction of wood powder or increasing that of magnetic powder. Equilibrium moisture contents (EMC) measured at high humidity were less than 6% even for the specimen with the highest volume fraction of wood powder. Because of such a low hygroscopic property, there was no significant difference in electromagnetic wave absorbing performance, estimated using relative permittivity and permeability between the samples exposed at high humidity and in the bone-dry condition. Furthermore, return losses of double-layered WPCs for practical use were simulated by transmission line theory. As a result, matched frequencies such that return loss reaches more than 40 dB were obtained in the microwave band by optimizing the sample thickness.

Journal

• Mokuzai Gakkaishi

  Mokuzai Gakkaishi 62 (1), 9-17, 2016

  The Japan Wood Research Society

Keywords

• wood-plastic composites
• electromagnetic wave absorber
• magnetic powder

Details

• CRID: 1390001206352148992
• NII Article ID: 130005121546
• NII Book ID: AN00240329
• DOI: 10.2488/jwrs.62.9
• ISSN: 18807577
• ISSN: 00214795
• NDL BIB ID: 027081103
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I027081103
• Web Site: https://www.jstage.jst.go.jp/article/jwrs/62/1/62_9/_pdf
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed