An object of the present invention is to provide a valve structure in which the valve seat is not fused to the outer sheet at the time of the heat seal to the sealed bag.
In A the present invention, the left and right of the three valve configuration sheet 1, 1 is a side seal, movement of fluid is restricted in close contact with the valve configuration sheet 1,1 facing each other. The compartment seal, inside and outside of the bag is partitioned, the valve is coordinated across the inside and outside of the bag, and is welded to the bag body by the partition seal. One opposed face of the valve arrangement sheet is configured in a non-welding film not welded by welding of the side seals and the partitioning seal. Non-welding film is one which is laminated on the opposing surface of the valve configuration sheet. Side seal becomes a non-welded portion which is not welded in the portion of the non-welding film, the downstream side in the moving direction of the fluid from the compartment seal, on the outer side of the lateral direction of the non-welded portion, contiguous with the partition sealing, from the non-welded portion to prevent the inflow of fluid into the mobile channel, lateral-containing anti-seal portion is provided.
.TECHNICAL