| 摘要 |
PROBLEM TO BE SOLVED: To force air in/out from an opening closure efficiently in a very short time, in various kinds of airtight bags. SOLUTION: The inlet-/outlet-opening closure 3 comprises an opening closure main body 4 comprising a cylindrical part 5 with a large-diameter cylindrical hole 6 and a flange 9 which is so attached as to be joined to the internal wall of the airtight bag, and a hermetically sealing lid closure 17 which engages with the cylindrical part 5 and hermetically seals the outside open-end 7 of the cylindrical hole 6, for example, by being screwed and fastened. The inlet-/ outlet opening closure 3 is provided with a non-return tongue piece 12 having flexibility, strong ability to restore, and satisfactory ability to stick fast, which is fixed at one end to the fixing part 15 on the internal face 11 of the flange 9, facing the inside of the airtight bag, so as to cover the inside open-end 8 of the cylindrical hole 6. |
