| 摘要 |
PROBLEM TO BE SOLVED: To provide a composite cap wherein voluminal pressure and strength are high, a top lid hardly detaches from a cap body and hardly deforms even when pressing force is exerted on the top lid. SOLUTION: A cap body 1 comprises a ceiling wall 4 and a cylindrical side wall 3 hanging from the peripheral edge of the ceiling wall. On the top face of the ceiling wall, a second periphery-like protrusion 6 for engaging the top lid is formed. The top lid 2 comprises a top face 20 and a skirt wall 21 hanging from the peripheral edge of the top face. The top face peripheral edge of the ceiling wall positioned at the outside of the periphery-like protrusion 6 for engaging the top lid in the cap body 1 has a slant face slanting to be low by 4-8 degree toward a root part of the periphery-like protrusion 6 from the outer peripheral edge. The outer face of the skirt wall 21, viewing the side cross section, is deviated as a whole more inwardly than a vertical line passing the root part, and at least the lower part slants inward toward the bottom end part. |
