| 摘要 |
PROBLEM TO BE SOLVED: To prevent a flexible film of a flexible bag body from being damaged even when a large stream occurs in inside liquid.SOLUTION: In a short side of a flexible bag body 221, an outer peripheral edge part where flexible films 220a and 220b are heat-sealed with each other directly or together with flexible films 220c and 220d, does not have a reinforcement with a high stiffness lead-out member 230, unlike an outer peripheral edge part where the flexible films 220a and 220b are heat-sealed with each other through the lead-out member 230. For this reason, resistance to breakage or the like is relatively low when the flexible bag body 221 deforms. Therefore, reinforcement welding parts 220e and 220f are provided at each corner of the short side where the lead-out member 230 of the flexible bag body 221 is provided and two long sides which are continuous to the short side, to make a sealing width of the flexible films 220a and 220b larger, so that a strength of the sealing parts are reinforced by the reinforcement welding parts 220e and 220f. |
