| 摘要 |
PURPOSE:To obtain the titled molded piece with a high shielding effect to electromagnetic waves by a method wherein the surface of a mold is made up of fine ceramics different in thermal conductivity from the base material of the mold and the variety, the constitution, the thickness, the configuration and the distribution thereof are changed to control electric conductivity of the surface of the molded piece. CONSTITUTION:Fine ceramics 6, 7 of one kind at least that differs in thermal conductivity from mold base material are interposed on the entire or partial portion of a surface through which the mold 1 and plastic material are in contact with each other or the partial portion of a mold is replaced by fine ceramics of one kind at least that differs in thermal conductivity from the base material of the mold to constitute the entire or partial portion of the surface through which the mold surface comes in contact with plastic material. Besides, variety, constitution, thickness, configuration and distribution are changed in said fine ceramics interposed or replaced and plastic material is injected into the molding clearance 4 through a sprue 5 to obtain the desired molded piece with a non-electrically-conductive portion 10 and an electrically-conductive portion 11. |
