| 摘要 |
PROBLEM TO BE SOLVED: To provide a tubular vessel in which a border line between a seal portion and a storage part is hard to be folded and which has durability.SOLUTION: A tube 12, which is cut to a prescribed length and has flexibility, is provided. One end of the tube 12 is equipped with a head part 14 having a bung hole 18. The other end of the tube 12 is equipped with a seal portion 22 which is flatly collapsed and is thermally welded, and a portion between the head part 14 and the seal portion 22 forms a storage part 13 for storing a content. The seal portion 22 is provided in a belt-like form. In a boundary line between the storage part 13 and the seal portion 22, a portion continuous with a side edge part 12c, which is formed by a fold when the tube 12 is flatly collapsed and is thermally welded, comprises a curved curve line portion.SELECTED DRAWING: Figure 1 |
