| 摘要 |
PROBLEM TO BE SOLVED: To solve a problem that a porous sheet is brought into contact with a content, and to prevent the clogging by providing a vent in a top surface of a cap for a container, arranging the porous sheet on an inner surface of the vent, and providing a protective member having a vent part to protect the porous sheet. SOLUTION: A vent 2 is provided on a top surface of a cap 1, and a screw part 3 to be screwed to a spout of a container body is provided on its inner circumferential surface. A permeable porous sheet 4 is thermally fused to the vent to prevent dusts from entering from the outside. In addition, an inner lid 5 which is a protective member is provided on an inner surface of the cap 1, and a cruciform slit 6 is provided for a vent part on a bottom surface of the inner lid 5. As the pressure is increased/decreased in the container, the slit 6 works as a valve to open/close the inner lid. The inner lid 5 is tightly attached to an inner circumference of the spout of the container to prevent the leakage of the content. Thus, the direct contact of the content in the container with the porous sheet 4 can be eliminated. |
