| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a highly sealable cap with diameter distortion corrective ribs with a stable fastening torque value or opening torque value when the cap is to be screwed with or unscrewed from a container. <P>SOLUTION: The cap 100 made of a plastic has, on the lower surface of a top plate 110 inside a peripheral wall 120, an outer sealing ring 111, a contact sealing ring 112 and an inner sealing ring 113 suspending successively toward the center. A plurality of diameter distortion corrective ribs 101 connecting with the outer peripheral surface of the outer sealing ring and the inner peripheral surface at the upper end of the peripheral wall are provided at equal intervals in the circumference. <P>COPYRIGHT: (C)2004,JPO |
