| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an over covering material which can maintain heat insulating performance without generating a pinhole even under such severe conditions that the pinhole often tends to be generated, since piercing is generated not only from the outside but also from the inside by interaction of increases of the size and the weight of a vacuum heat insulating material on top of the increase of the hardness of a core material, when an inorganic board-shaped core material is used as the core material for the vacuum heat insulating material to be mounted to a refrigerator. <P>SOLUTION: The generation of the pinhole caused by the piercing from both the outside and the inside is prevented by making a nylon film in a laminated structure of the outer covering material of the vacuum heat insulating material to be two or more layers even when the hardness, the size, and the weight of the core material are large. The vacuum heat insulating material excellent in the heat insulating performance with the lapse of time and the energy-saving refrigerator are provided by using the outer covering material in which the pinhole is hardly generated. <P>COPYRIGHT: (C)2003,JPO</p> |
