| 摘要 |
PROBLEM TO BE SOLVED: To obtain a mouth stopper at low manufacturing cost while improving a positive sealing-up, easiness in unsealing and satisfactoriness in spouting by a method wherein a ring-shaped half-cut part for opening a hole is provided at the stepped surface of a mouth stopper main body, and an unsealing projecting part is provided at the external surface side of a part corresponding to the ring-shaped half-cut part at the stepped surface. SOLUTION: A half-cut part 4a formed in a ringlike shape for opening a hole is formed at the stepped surface 4 between a lower upside plate 2 and an upper upside plate 3 that are different in level each other constituting the main body of a cap-shaped mouth stopper A on a position at the internal surface side or the external surface side of the mouth stopper main body, and a projecting part 5 for unsealing is provided, extending approximately in the horizontal direction, at the external surface side of the stepped surface 4 facing a part corresponding to a ring-shaped area surrounded by the ring-shaped half-cut part 4a. By pulling up the projecting part 5 at its tip upward or sideways from its horizontal oposition, the half-cut part 4a in a thin structure is torn up and removed from the stepped surface 4 and thereby a hole-opening part is formed. |
