| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent the internal pressure of a container from abnormally rising, and at the same time, to favorably keep air-tightness at a normal temperature. <P>SOLUTION: The internal surface 4 of the top wall 3 of this cap 2 is provided with an intermittent contact ring 6 which presses a packing 5. Then, the internal side of the contact ring 6 is provided with a center boss 7 which regulates displacement of the packing. <P>COPYRIGHT: (C)2003,JPO |
