| 摘要 |
The filter paper insert (1) has two layers (2) made from filter paper, where the layers are connected with each other at a base (4) and at opposite-lying side walls (3,5) for forming a filled inner space. The fewer slots (11) per unit surface than in an upper area (10) are formed in an adjacent lower area (8) of the filter paper insert. The upper area is arranged adjacent to a filling opening. The slots are formed in the upper area longer than in the lower area. The slots are formed in a wave-shaped manner. |
