| 摘要 |
PURPOSE:To prevent a deformation of a package can, and to increase the airtightness, so as to improve the reliability, by carrying out the calking by making the height of the corners in the upper opening smaller a specific height than the height at the center of a long side. CONSTITUTION:At the upper side of a step 2, a specific size of rising part 3 is formed, while the step 2 is formed by extending the upper opening of a package can 1 with a square tube form with bottom. In this case, when the height at the center of a long side is made h1, and the height of the corners is made h2, the rectangle is made h1>h2, and when the upper opening is contracted, the opening is made possible to bend to the inner side by making the height of the whole body of the upper opening equal and the widths of the sides equal. Consequently, when insulating gaskets are bent in a sealing process, the upper opening can be contracted evenly along the whole body and sufficiently, and the deformation of the package can is prevented as well as the airtightness is improved, so as to improve the reliability. |
