| 摘要 |
<p>PURPOSE:To make the degree of vacuum in an outer packaging material to be maintained properly without producing heat bridge, and to make satisfactory capacity of thermal insulation to be developed for a long period of time. CONSTITUTION:The structure is constructed by making a thermal insulating material 3 to be sealed up in vacuum in a bag-like outer packaging material 2. The outer packaging material 2 is constructed of a transparent three-layer laminated film 2a that is made up by laminating outer and inner layers made of transparent plastic films and an intermediate layer made by laying silicon oxide over a transparent plastic film by means of vapor deposition. Granular air infiltration-sensing materials 4 that discolor in touching air are interposed between the outer packaging material 2 and the thermal insulating material 3.</p> |
