| 摘要 |
PROBLEM TO BE SOLVED: To prevent a content in a container from oozing out by a method wherein two threaded members each having a hole communicating with a vent opening are provided at the center on the inner face of a cap, and a porous sheet is held between the two members. SOLUTION: Screw threads 3 to be screwed on a mouth of a container main body are formed on the inner face of a sidewall of a cap 1 and protrusions 4 are formed on the outer face of the sidewall to easily hold the cap 1. An upper threaded member 8 with a hole 7 leading to a vent opening 2 is projected from the center of the inner face of the cap 1, and a lower threaded member 9 to be screwed on the upper threaded member 8 has a hole similarly and a sheet mount 10 to hold an airpermeable sheet 6 between the downside of the upper threaded member 8 and the upside of the lower threaded member 9. The air-permeable sheet 6 is placed on the sheet mount 10 and fixed by holding it between the upper threaded member 8 and the lower threaded member 9. Thereby, a porous membrane of the air-permeable sheet itself is prevented from breaking through fusing in the case the air-permeable sheet is fixed by thermal fusion bonding. |
