| 摘要 |
There is provided a sack having an inner ply and an outer ply, wherein: the outer ply forms a longitudinally extending overlapping region comprising an inner and an outer layer; a first end portion of the outer ply forms the inner layer and a second end portion of the outer ply forms the outer layer; an inside of the outer layer is glued to an outside of the inner layer to form a discontinuous longitudinal seam; and an inside of the first end portion is glued to the inner ply, such that air may pass out from an interspace between the inner and the outer ply through channels in the discontinuous longitudinal seam. |
