| 摘要 |
<p>PURPOSE:To obtain a composite vacuum multilayer heat insulating material for extremely low temperature which is advantageous in cost and efficiently suppresses heat by forming a radiation heat cut-off layer in a high temperature side region and forming a heat transmission suppressing layer in a low temperature region. CONSTITUTION:A vacuum layer 6 is divided into a high temperature side region having the large influence of radiation heat and a low temperature side region having the large influence of the heat transmission, and a composite vacuum multilayer heat insulating material 23 for extremely low temperature is constituted by forming a radiation heat cut-off layer 18 which is formed by laminating dimple type Al vapor deposition films 17 in the high temperature side region and forming a heat transmission suppressing layer 22 which is formed by alternately laminating Al vapor deposition films 12 and dimple type films 21 which are formed by forming recessed parts 19 and projecting parts 20 in a necessary pitch on the surface of a polyester film 10 in the low temperature side region. Accordingly, the radiation heat and the heat transmission can be suppressed efficiently, and the superior heat insulating function can be obtained as a whole, and cost advantage can be realized.</p> |
