| 摘要 |
<p>A bag body (2) has a bag front side sheet (21) and a bag back side sheet (22) opposing each other, and a gore sheet (23) arranged between the respective sheets (21, 22). A deaeration valve (3) fixed to the bag body (2) has opposing wall face sheets made of a plastic film, is arranged at least between the bag front side sheet (21) and the bag back side sheet (22) and is fixed to the bag body (2) when an end side seal (S1) is formed. A seal (S2) for securing a valve is formed on and bonded to the inner surface of any one of the bag front side sheet (21) and the bag back side sheet (22), and at least a part of the seal (S2) for securing a valve is formed closely to the upstream end (3a) of the deaeration valve (3) with reference to the direction of air flow during deaeration and within a range of one half of the distance (L1) from the upstream end (3a) to the end side seal (S1).</p> |
