缶体

Japanese Patent JP7378200

B2

To provide a can which enables high-precision inner pressure testing and improves the drop impact strength and the pressure resistance capacity without thickening the can bottom part.SOLUTION: Bottom of a can consists of a circular projection, projecting outward of the can axis direction, a circular depression, located inside of the circular projection in the radial direction and depressing inward of the can axis direction, and a flat panel surrounded by the circular depression. The circular depression consists of an inner depressed wall and an inner standing wall, connecting to the inner depressed wall and standing outward of the can axis direction. Between the inner standing wall and the flat panel, there is a corner projection projecting outward in the radial direction. On the basis of following assumption: the diameter of a grounding part of the circular projection as D1, the diameter of an outer circumference of the flat panel as D3, the vertical length from the grounding part to the apex of the circular projection as H2, the vertical length from the grounding part to the outer circumference of the flat panel as H3, the radius of curvature of the inner depressed wall as r1, and the radius of curvature of the outer circumferential depressed wall as r2, followings are defined that the ratio (D3/D1) should be more than 0.6 and less than 0.85, that the ratio (H3/H2) should be more than 0.4 and less than 0.9, and that the relation between r1 and r2 should be r1