Single or multi-ply filter medium for air filtration and a filter element made therefrom
AssigneeFiberMark Gessner GmbH & Co.
InventorAndreas Strauss
Life of this patent
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Abstract
A dual- or multi-layer filter medium for air filtration, having at least one meltblown layer (2, 2a and 5) at least one meltblown layer (2 and 2a) is placed on the inlet side of the filter medium. The meltblown layer has a pore size larger than that of the next following layer or layers.
Claims20
A dual- or multi-layer filter medium for air filtration, which comprises at least one meltblown layer located on an inlet side of the filter medium and having a pore size larger than that of the following layer or layers, wherein the meltblown layer has a pore size of more than 100 μm, an area mass in a range between 10 and 100 g/m2, a permeability to air (at 200 Pa) of over 2000 l/m2s and fibers having a diameter of over 10 μm.
A dual- or multi-layer filter medium for air filtration, which comprises at least one meltblown layer located on an inlet side of the filter medium and having a pore size larger than that of the following layer or layers, wherein the meltblown layer has a pore size of more than 250 μm, an area mass in a range between 10 and 100 g/m2, a permeability to air (at 200 Pa) of over 5000 l/m2s and fibers having a diameter of over 10 μm.
Dependencies are inferred from the claim text.