| 主权项 |
1. A filter medium (1, 11) comprising:
a first media layer (3, 13); a second media layer (4, 14); and at least one third media layer (5, 15 or 16); wherein the second media layer (4, 14) is arranged downstream from the first media layer (3, 13) in the intended direction of flow (2, 12) of the filter medium (1, 11); wherein the third media layer (5, 15) is arranged downstream from the second media layer (4, 14) in the intended direction of flow (2, 12) through the filter medium; wherein the first media layer has a degree of particle separation, which is lower than the degree of particle separation of the second media layer; wherein the second media layer has a degree of particle separation which is lower than the degree of particle separation of the third media layer; and wherein the media layers (3, 4, 5, 13, 14, 15) are arranged loosely and not bonded to one another, or are arranged loosely and bonded in a spot-bonded manner. |
