| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a plastic cap having superior plugging wherein an engagement protrusion can smoothly climb over an engagement part of a container mouth part when the plugging is made, and a degradation or the like of fitting force of an upper lid due to plugging, is effectively prevented. <P>SOLUTION: The plastic cap consists of a cap body and an upper lid, and is fitted and fixed in the container mouth part by plugging. The cap body consists of a top plate and a skirt having the engagement protrusion formed therein, and engaging with an engaging part formed on the outer surface of the container mouth part. The upper lid is mounted in the cap body to cover the top plate of the cap body. In the inside surface of the skirt, a plurality of protrusions formed under the engagement protrusion and forming a smaller inner diameter than the largest outer diameter of engagement part of the container mouth part, are formed in the peripheral direction, and a plurality of vertical direction ribs having a larger inner diameter than the largest diameter at the front end of the container mouth part, are formed. <P>COPYRIGHT: (C)2013,JPO&INPIT |
