| 摘要 |
<P>PROBLEM TO BE SOLVED: To obtain a cap with an inner plug which can effectively prevent a warp of the inner plug during opening, keeps the inner plug from remaining even when the cap is applied to a vessel subjected to high temperature filling, shows excellent openability without an increase of opening torque, and can assure sealability and oxygen barrier. <P>SOLUTION: The inner plug 2 includes an inner plug body 3 formed of a rigid resin and a seal body 4 integrally formed on the inner surface side of the same and made of a soft resin softer than the rigid resin, and the outer circumferential margin of the inner plug body 3 curves downward to increase warp stiffness during opening, and to prevent deformation of the lower end of the outer circumferential margin of the seal body in the radially outward direction. <P>COPYRIGHT: (C)2011,JPO&INPIT |
