| 摘要 |
Casing having a gas adsorbing device and a core material inserted therein is depressurized in a vacuum chamber. Any opening portion thereof is hermetically sealed and air introduction is carried out. In the atmospheric pressure, a pressure of about 1 atm. corresponding to a pressure difference between inside and outside is applied to the casing of vacuum heat insulator. The casing, as consisting of a plastic laminate film, is deformed by pressure, so that stabbing of container with projections occurs to thereby form through holes, resulting in communicating of the gas adsorbent within the container with the interior of the casing. Thus, application to vacuum heat insulator can be realized without any deterioration of gas adsorbent at both of storage and application to vacuum heat insulator, so that long-term retention of vacuum degree can be ensured.
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