| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a means for preventing a fall in heat insulating performance of a vacuum heat insulator caused by the lapse of an operating time regarding the vacuum heat insulator used for a vending machine or the like for canned beverages. <P>SOLUTION: A polyethylene film with a density of 0.94 g/cm<SP>3</SP>or more or a fusing point of 125°C or higher is used as a heat seal layer constituting an envelope material of the vacuum heat insulator. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
