| 摘要 |
In a novel variable-volume body fillable with fluid, consisting of at least two overlying films (1,2) (preferably of plastics) welded together along at least one closed curve (specifically the peripheral edge), the films are parallel to each other at the side of the welded edge (R) overlying the fillable volume (V) and in the empty state the sides facing the fillable volume together enclose an angle of more than 0[deg] (preferably at least 30[deg], especially ca. 45[deg]). An independent claim is included for the production of variable bodies of the above type, where the films (1, 2) are (a) pressed together in parallel (at least during welding) at the side of the welded edge (R) overlying the volume (V) to become fillable and (b) kept free of forces impacting the films together at the sides facing the fillable volume. |
