| 摘要 |
PROBLEM TO BE SOLVED: To provide a spout stopper which has a check valve free from product failure such as deformation generated in a welding process, and has a valve body reliably opened and closed in use.SOLUTION: A spout stopper A with a check valve C is welded to an opening of a bag-shaped container. The spout stopper A has a spout cylinder 1 and a welded portion 2 formed under the spout cylinder 1, the spout stopper 1 has the check valve C including a valve seat cylinder 3 held inside the welded portion 2, and a valve body 4 provided at an upper surface 32a of the valve seat cylinder 3, and the valve seat cylinder 3 is formed separated from the valve body 4, and is held to form a gap E between the upper surface 32a of an outer peripheral wall 31 and an inner peripheral surface 12a, 2a of the spout cylinder 1. |
