| 摘要 |
PROBLEM TO BE SOLVED: To conveniently obtain two inconsistent properties such as indispensable requirement for an article as an ejection plug that the plug may not be removed and easy removable at the time of disposal. SOLUTION: Two longitudinal cracking thin breaking lines 2 are provided in parallel at appropriate positions of an outer peripheral wall 1 with an engaging protrusion provided along an inner periphery to be fitted and engaged with an outer periphery of a neck of a container A, a louver ring 3 is provided via an appropriate number of thin small breaking pieces 5 around the outer peripheral wall 1, and a base 8 of the louver ring 3 is connected via a coupling piece 7 to a lower end of a crack 6 between both cracking thin breaking lines 2. |
