| 摘要 |
PURPOSE:To ensure that an object consisting of a non-conductive element is not susceptive of explosion due to static electricity or fire due to ignition to avoid a danger as the surface of the object becomes easily earthed due to an increase in electroconductivity by filling an explosion-proof chamber maintained higher than a specified level of relative humidity with a raw material such as a foaming agent. CONSTITUTION:A space between paired walls 2 covered with a fixture 4 is filled with a raw material for a foamed heat insulating material such as hydrocarbon or polyol. After the supply of the raw material, foaming develops and hydrocarbon leaking from the fixture 4 following the foaming is exhausted. This foamed resin is cured and paired walls 2 are obtained. An explosition-proof chamber 13 is equipped with a suction air blower 14 and an exhaustion air blower 15, and is heated through an electric heater 16. In addition, an object in the explosition-proof chamber 13 is earthed. Further, the relative humidity of the chamber is maintained higher than 65% using a humidity adjuster installed at the chamber 13. Thus the surface of the object becomes electroconductive more highly so that it is more susceptible of earthing. |
