| 摘要 |
<p>PROBLEM TO BE SOLVED: To improve secular heat insulating performance by depressurizing and sealing the inside of an outer member including a room temperature activation type getter material and the like. SOLUTION: As a room temperature activation type getter material to absorb and eliminate at least nitrogen, oxygen, a water content and carbon dioxide, a combo getter including barium-lithium alloy is used for a gas absorbent 5. A predetermined amount of 'Toku-seal P(R)' 4 is filled into an inner bag member 3 having permeability so as to prepare the core 2 of this vacuum heat insulating body 1. In this case, after heat treatment is executed to the core 2 at about 150 deg.C for about 1 hour, the core 2 is inserted together with the gas absorbent 5 in a gas barrier film-made outer member 6. Vacuum exhaustion is performed by a vacuum chamber equipped with a thermal seal device, and the end part of the outer member 6 is sealed by thermal seal. At this time, exhaustion and depressurization are so performed that the initial internal pressure of the vacuum heat insulating body 1 is set to less than about 13 pascals.</p> |
