| 摘要 |
PROBLEM TO BE SOLVED: To obtain sealability and easiness in unsealing by sectioning into a first region extending in an arc shape with a specific angle and width and a second region having a specific width of a narrow peripheral non-adhesive or weakly adhesive area, and by changing an adhesion state between a liner and a top wall inner face of a shell by a radial adhesive area or the like of the first region and the weakly adhesive area or the like of the second region. SOLUTION: A region of an inner face of a top plate wall 8 of a shell 4 and a liner 6 extends in an arc shape with a width W1 from an outer peripheral rim 38 to a radial direction inner side rim 42 (where 0.25R<=W1<=0.60R for a radius R of the liner 6) to section into a first region 44 and a second region 46 where a center lines 48 of a holding piece 12 extend in both circumferential directions at an angle αof 50 to 90 deg. respectively. An adhesion state between the liner 6 and the top wall 8 inner face of the shell 4 is changed by the first region 44 where the plurality of radial adhesive areas 50 and other non-adhesive or weakly adhesive areas exist and the second region 46 where a width W2 from an outer peripheral rim 38 of the liner 6 to an inner rim 52 in a radial direction of 1.0 to 6.0 mm extends in an arc shape, and narrow peripheral non-adhesive or weakly adhesive areas 54 aligning with a pair of scores 20a, 20b and other adhesive areas exist. |
