| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a plastic cap having excellent unsealability which prevents an upper lid from being excessively wound up, prevents an increase of a torque for opening the lid, and prevents a cap body from co-rotating when opening the lid in the plastic cap wherein the cap body and the upper lid are fixed by a screw engagement. <P>SOLUTION: In the plastic cap, a steep surface is formed at the start end 10 of male threads 6 formed on the cap body 1, and though it is not locked with the steep surface of the start end 10 of the male screws at the time when a top plate part 3 of the cap body and the lower end of the upper lid side wall abut on each other, a stopper 24 is formed in the vicinity of the position on female threads of the upper lid 2. <P>COPYRIGHT: (C)2007,JPO&INPIT |
