| 摘要 |
PROBLEM TO BE SOLVED: To obtain a sealing of high airtightness by a method wherein at the end of a container body which has a heat-sealable surface on the inside, a flange which curves in a small radius of curvature, and expands to the outside from the container body, is formed, and a heat-sealable, flat and circular surface is superposed on the top of the flange, and the flange is bent to the inside. SOLUTION: A container 10 has an approx. cylindrical container barrel 11 formed of an optical material, having a heat-sealable surface 12 on the inside, and in order to close the bottom part end, an approx. circular backing film 24 having a heat-sealable internal surface, is installed on the bottom part of the container barrel part 11. In this case, at the lower end part of the container barrel 11, a flange 22 which curves in a small radius of curvature and expands to the outside from the container barrel 11, is formed, and a backing film 24 which is a heat-sealable, flat and circular surface, is superposed on the top of the flange 22. Then, a seaming treatment to bend the flange 22 to the inside together with the baking film 24, is applied, and also, a heat-sealing is performed, and by doing so, the open bottom part of the container barrel 11 is airtightly sealed. |
