| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a pull-top type cap which prevents a pull ring from easily breaking and being cut when it is pulled. <P>SOLUTION: The cap is made of a synthetic resin, and comprises a frame 1, a lid 2 joined to the frame 1 via a tear-off part 4, and at least a pull-top part 3 joined to the lid 2, and it is characterised in that the pull-top part 3 has the pull ring 3a whose entire circumference is made of a synthetic resin having no orientation due to resin flow, and the ratio (B/A) of the break strength (B) of the pull ring 3a to the break strength (A) of the tear-off part 4 is greater than 1. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
