| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a vacuum heat insulating material having a jacket material capable of suppressing generation of a pin hole even when a tip of an object to stick in a laminate film is thinner than the thickness of the laminate film. <P>SOLUTION: The jacket material 2 has a multi-layered structure comprising a seal layer 5, a metal foil 6, a first plastic film 7 and a second plastic film 8. The plastic film having the maximum Young's modulus, the maximum Rockwell hardness or the maximum pencil hardness out of the plastic films constituting the jacket material 2 is arranged adjacent to the seal layer 5 or the metal foil 6. Since deformation of the film having such a property is small even when large stress is applied, even if a foreign matter having a sharp tip is pressed by the atmospheric pressure, the film is subject to small deformation and is hardly broken. Due to this effect, generation of the pin hole can be prevented. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
