| 摘要 |
PURPOSE:To prevent static electricity from being generated, by a method wherein a metal containing resin of a conductive material is used for a wall surface of an inner jig comprised of a synthetic resin and the wall surface is made to have the same electric potential as that of an inner box part comprised of the synthetic resin of a heat insulation box body. CONSTITUTION:A heat insulation box body A is formed of an inner box 7 which is made of a synthetic resin and provided with an outward flange 7a on the front end, an outer box which is made of a metal and provided with an inward flange 8a abutting against the flange 7a of the inner box 7 on the front end and a foaming heat insulation material 9 which takes an inflammable hydrocarbon such as pentane or cyclopentane as a foaming agent between wall surfaces of both the boxes 7, 8. Hereby, even if static electricity is generated between the inner jig 3 for wall surface of which a conductive material 3a is used and the inner box 7 comprised of the synthetic resin, earth becomes easy to take. Consequently, safe foamed jig wherein such a hazard that the circumference is damaged by explosion of the foaming agent during foaming of the heat insulation material is eliminated is obtained. |
