| 摘要 |
PROBLEM TO BE SOLVED: To prevent an over-cap 1 from being off out of a container during a fitting stage for a container 11 or prevent the over-cap 1 from being removed out of the container 11 due to heat, when a surface packaging film 21 is fixed to the container by a shrink packaging method in the over-cap 1 installed to cover an opening part of the container hermetically sealed by a lid. SOLUTION: An vent groove 5 for dividing an inward annular protuberance 4 to engage with a container 11 is formed at a cylinder 2 of an over-cap 1. Since air between the over-cap 1 and the container 11 is released outside the vent groove 5, it is possible to prevent the over-cap 1 from being removed during a fitting step of the over-cap 1 or a step in which a packaging film 21 is hermetically stuck to the barrel part of the container 11 by heating. |
