| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide vacuum heat insulation material that can be used for a heat insulation box, in which deformation of the heat insulation box is hard to occur, and in which defects in the heat insulation box by reason of the vacuum heat insulation material are reduced. <P>SOLUTION: The vacuum heat insulation material 1 is held between two hard and flat plates, applying compression stress of 9.8 kPa to check recesses. Form of the recess as seen in a perpendicular direction to the hard and flat plate is 2500 mm<SP>2</SP>or less per recess. For one recess, the maximum value of the shortest distance from a arbitrary point in the recess to a boundary is 28 mm or less. Form of the vacuum insulation material as seen from the end surface side is 100 mm or less in length, and the maximum value of distance to the hard and flat plate is 1 mm or less. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
