| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for manufacturing a vacuum heat insulator, a thermal insulation box, and a vacuum heat insulator, while saving energy and resources.SOLUTION: A vacuum heat insulator 1 includes a core material 10 composed of a fiber assembly, and wrapping materials 20 and 21 with which the core material 10 is covered. The inside of the wrapping materials 20 and 21 is depressurized and sealed. The core material 10 has a compressive stress of 5 kPa or less when compressed in thickness by 50% under atmospheric pressure after taken out of the inside of the wrapping materials 20 and 21.SELECTED DRAWING: Figure 1 |
