| 摘要 |
PROBLEM TO BE SOLVED: To generate no sink mark on a seal part, to improve durability of a mold, to make smooth air ventillation possible and to provide a smart appearance. SOLUTION: A cap 1 is a synthetic resin molded article consisting of a cap main body 2 consisting of a bottomed cylinder and an outer cylinder 3 integrally connected with the outer peripheral face of the cap main body 2. A plurality of longitudinal ribs 4 are integrally provided on the outer peripheral face of the cap main body 2. An outer cylinder 3 is provided on the outer periphery of the cap main body 2 below the longitudinal ribs 4. A circular seal part 7 is provided on the inner peripheral face of the cap main body 2 covered by the outer cylinder 3. The connecting part 8 between the cap main body 2 and the outer cylinder 3 is only the lower end part of the longitudinal ribs 4 and the top end part of the outer cylinder 3. |
