| 摘要 |
PROBLEM TO BE SOLVED: To provide a vessel in which a valve can be smoothly opened and closed by the pressure change of a vessel body even after storage for a long time by forming a protruding structure on the inside of a lid to be put on a valve, and bringing the protruding structure to the valve when the lid is closed to hold the valve in slightly opened state. SOLUTION: A vessel for housing a highly viscous detergent is provided with a valve 2 provided on the upper opening of an elastic deformable body and a lid 3 to be put on the opening. The cylindrical support part and disc-like movable part 22 of the valve 2 are elastic, and a cross slit 23 is formed in the center of the movable part 22. On the other hand, a protruding structure 4 formed on the inside of the lid 3 has a form for making contact with the valve 2 to slightly push the valve 2 inward when the lid 3 is closed. The valve 2 is formed into a spherical surface in which the movable part 22 is protruded to the inner part of the opening when the internal pressure is substantially equal to the atmospheric pressure, and the curvature radius R2 of the spherical surface and the curvature radius R4 of the spherical surface formed on the inside of the lid 3 are set so as to be R2 >R4 . |
