| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent the cross contamination and an adverse effect on the environment by providing one or two or more grooves in an outer surface of a cap fitting part from a lower end in a range of a specified height not reaching an upper end to prevent a cap from being jumped out due to the increase of the internal pressure in a sealed container. SOLUTION: One groove 21 tapered narrower toward a tip is cut in an outer surface 22 of a fitting part 16 of a cap 12 to be fitted to an opening part 13 of a storage part 11 in an attachable/detachable manner in a range (h) to a specified height 26 not reaching an upper end 25 of the outer surface closely attached to the opening part 13 of the storage part 11. When the internal pressure in a container is increased by the temperature change, the air column in the groove 21 is also inflated, and a gap between the outer surface 22 of the fitting part 16 in the vicinity of the groove 21 and an inner wall of the opening part 13 is expanded to break the close attachment of an area around the groove 21, and thus, the cap 12 is easily moved upward even by the slightest increase in the internal pressure to eliminate the increase in the internal pressure.</p> |
