| 摘要 |
PURPOSE:To aim at preventing a high temperature resistant flexible film bag from deteriorating, by arranging a solid material sheet-like member adapted to be melted and evaporated at a high temperature, on one side of the flexible film bag, which is exposed to a high temperature. CONSTITUTION:A solid-like material sheet member 4 adapted to be melted or evaporated at a temperature lower than that of a high temperature heat source is integrally incorporated with or arranged in the vicinity of a bag 1 made of a gas-tight and water-tight flexible film, on one side which is exposed to a high temperature. When high temperature gas 3 is jetted into the bag 1 through a jet-in port 2, the sheet member 4 is melted or evaporated by the high temperature gas 3, that is, the phase change from solid to liquid or gas is effected. A large heat quantity accompanied with the phase change is absorbed by the sheet member 4, and therefore, it is possible to prevent the flexible film bag 1 from deteriorating.
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