HEAT INSULATION BOX BODY

PURPOSE:To prevent a hydrocarbon of a foaming agent from being exploded, since even if static electricity which is apt to be generated by progressing the foaming of a foamed heat insulation material is led outside, by a method wherein a wall surface of an inner box comprised of a synthetic resin on the foamed heat insulation material side is made into the same electric potential as that of an outer box by applying a conductive coating to the wall surface. CONSTITUTION:A heat insulation box body 1 of a refrigerator is formed of a metallic outer box 2, an inner box 3 made of a synthetic resin and a foamed heat insulation material 4 wherein a hydrocarbon filled into a space between both the boxes 2, 3 is taken as a foaming agent. In the outer box 2, a double flange 5 is formed on a front edge of an opening, in which an outward flange 6 formed on the front edge of the opening of the inner box 3 is inserted. A conductive coating 7 is applied to the surface of a foamed heat insulation material side of the inner box 3. The conductive coating 7 is positioned at the flange also, joined electrically to the double flange 5 of the outer box 2 and formed into the same electric potential as that of the outer box 2. Hereby, it becomes earthable easily through the outer box 2. Such a hazard that the circumference is destroyed by an explosion of a foaming agent during a foaming operation of a heat insulation material is eliminated.