ELECTROMAGNETIC SHIELDING MATERIAL AND MANUFACTURE THEREOF

PURPOSE:To reduce a surface resistance value and to improve its electromagnetic shielding effect corresponding to that of a metal foil by forming of an impregnable base material and conductivity imparting agent coating the material and heating and pressurizing the material coated with the agent. CONSTITUTION:The electromagnetic shielding material comprises an impregnable base material, and conductivity imparting agent coating the material. The material is sheetlike in which vehicle contained in the agent is impregnated therein when the coating or printed agent is heated and pressurized, and desirably nonwoven fabric. The agent is a substance impregnated in the material for imparting conductivity by heating and pressurizing, and includes, for example, conductive paint such as paste, ink, etc. The agent is screen printed, heated and pressurized to improve the conductivity. Thus, a surface resistance value is reduced to 1/5 of that of prior art, and its electromagnetic wave shielding effect can be improved corresponding to that of a metal foil.