| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a packaging container which liberates gas generated from a content, moreover, has high heat insulation property, has a satisfactory strength and can reduce a manufacturing cost.SOLUTION: A packaging container includes: a first trunk part (110) made by rounding a first sheet material, overlapping both side edges on each other and adhering an overlapped part to make a cylindrical shape; a second trunk part (120) made by rounding a second sheet material, overlapping both side edges on each other and adhering an overlapped part to make a cylindrical part and is inserted to an inner part of the first trunk part; and a bottom part (130) and a cover part (140) which seal two open edges of the second trunk part respectively. Therein, a bottom part lateral inner curl is formed by folding an open edge of the bottom part side of the first trunk part to the inner side, a bottom part lateral outer curl is formed by folding an open edge of the bottom part side of the second trunk part to the outer side, the bottom part is adhered to the whole circumference of the bottom part lateral outer curl on the periphery part of one surface and is adhered to at least a part of bottom part lateral inner curl on the periphery part of the other surface and a backflow prevention valve which can exhaust gas to an external part of the container is provided on one part.</p> |
