Abstract
Rice-hull and soy-hull are agricultural by-products in Japan, and are required to be reused from a viewpoint of the recycling. The rice-hull and soy-hull carbon (RHC and SHC) powders are manufactured by carbonizing in nitrogen gas atmosphere at high temperature. The RHC and SHC carbon sheets are manufactured by wet papermaking process, in which the RHC and SHC powders, aramid fiber and LDPE (low density polyethylene) fiber are mixed in the water, and then drained the water to make the RHC and SHC carbon sheets. In this study, electrical conductivity, electromagnetic wave shielding and absorption properties of the RHC and SHC carbon sheets were discussed. Especially, the effects of the powder content, test-piece thickness, and the particle size of the RHC and SHC powders were measured. The result showed that the conductivity and the shielding effects were high in the SHC sheets with the large particle size. The absorption property was also high under certain high frequency areas for the RHC and SHC carbon sheets.
