| 摘要 |
PROBLEM TO BE SOLVED: To reduce damages to an outer bag generated in the case of installing a planar vacuum insulation material to a heat retaining tub and to reduce the degradation of a temporal performance. SOLUTION: By forming a bend groove on the planar vacuum insulation material 1, bending it at the groove part and installing it so as to surround an inner container side face in a polygonal column shape, the crack generation of the gas barrier layer of a film constituting the outer bag caused by the bending of a ridge line at the upper end part and lower end part of a polygonal column is reduced. Thus, the increase of the intruding gas amount of the vacuum insulation material 1 is reduced and temporal reliability is improved more than a conventional cylindrical product. COPYRIGHT: (C)2006,JPO&NCIPI
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