| 摘要 |
PURPOSE:To reduce the elution of impurities or poisonous substance to water and, at the same time, give enough sealing properties to the material concerned by a method wherein a heating process, in which at least either one of resin- impregnated base material and formed body is heated up to the specified temperature, is provided. CONSTITUTION:The manufacture concerned contains a resin impregnating process, in which fibrous base material and aqueous dispersion are used, a forming process, in which resin-impregnated base material obtained in the resin impregnating process is formed so as to produce formed body, and, at the same time, a heating process, in which at least either one of the resin-impregnated base material and the formed body is heated up to the predetermined temperature. In the heating process, at least either one of the resin-impregnated base material obtained in the resin impregnating process and the formed body obtained in the forming process is heated normally up to 100-30 deg.C. Further, heating is performed normally for 0.5-2hr, preferably for 1-1.5hr. Through the above- mentioned heating, sealing material, from which surface active agent and impurities are hard to elute to water of the like, can be produced. |
