| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a vacuum heat insulation material that can maintain stable heat insulation performance for a long term without largely impairing heat insulation performance over time, and can be used as a heat insulation material of a structure.SOLUTION: A vacuum heat insulation material 1 vacuum-packaged doubly includes: an internal vacuum heat insulation material 4 comprising a core material 2, and an inner covering material 3 covering the core material 2, formed by decompressing and sealing its inside and having gas barrier performance; and an outer covering material 5 covering the internal vacuum heat insulation material 4, formed by decompressing and sealing its inside and having gas barrier performance. The outer covering material 5 covers the internal vacuum heat insulation material 4 by thermally welding one sheet of a film having gas barrier performance.</p> |
