| 摘要 |
PURPOSE: To sufficiently prevent leakage only with a valveequipped stopper by a method wherein a depressing distributing valve is provided at the neck of a container, and a curved elastic valve, with a constantly-closed slit formed at its center, is provided at the distributing valve while a curved elastic thin part is provided at the peripheral edge of the curved elastic valve. CONSTITUTION: In a valve-equipped stopper A, a distributing valve 2, a separate member made of an elastic material, spherically curved downward is provided at the inside of a stopper drum 1 to be fitted watertightly to a neck Ba of a container. A curved elastic valve 23, with a constantly-closed slit 24 provided at the center thereof, is provided at the distributing valve 2 while a curved elastic thin part 22 is provided at the peripheral edge of the curved elastic valve 23. Thereby, leakage of contents can be prevented certaily with the state of closure being kept only with the valve-equipped stopper even though the internal pressure of the container rises a little because of swelling of contents caused by changes of atmospheric temperature or room temperature, or by unexpected external force applied to the container. |
