Multi-layer filter material and filter element produced therefrom
AssigneeNeenah Gessner GmbH
InventorsAndreas Demmel, Ingrid Meyr, Bernd Klausnitzer
Life of this patent
Estimating the term…
Abstract
The invention relates to a multi-layer cleanable filter material for gas and liquid filtration, said filter material comprising a filter layer and a substrate layer that follows the filter layer in the flow direction, wherein the filter layer is substantially dendrite-free and consists of a melt-blown fleece made of elastic polymer fibres that has a breaking elongation of at least 100%.
Claims15
1-17. (canceled)
Cleanable filter material comprising a cleanable first layer of a meltblown nonwoven and a further layer which forms a carrier layer, wherein the meltblown nonwoven is made of elastic polymer fibres, characterised in that the elastic polymer fibres are made of thermoplastic elastomers or of mixtures of thermoplastic elastomers and non-elastic polymers, wherein the polymer for the production of the elastic polymer fibres has an elongation at break according to DIN 53504 of at least 100% at 23±2° C., and in that the meltblown nonwoven has an elongation at break according to DIN EN ISO 1924-2 of at least 100%, a weight per unit area of 5-200 g/m2, a thickness of 0.05-2.0 mm, a permeability to air of 10-8000 g/m2/s and an average fibre diameter of 0.3-12 μm.
Dependencies are inferred from the claim text.