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US 2011/0253645 A1Published application
Filter medium
AssigneeJohns Manville
InventorsChristian Hassmann, Hans-Jürgen Meitinger, Kurt Plotz, Jürgen Umminger, Michael Schops
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Abstract
The present invention relates to a filter composed of a multi-ply filter medium, which comprises at least one non-woven stiffening layer, at least one filtration layer, at least one covering layer and where necessary at least one non-woven microfibre layer, the non-woven stiffening layer comprising fibres of synthetic polymers and the fibres being both partially oriented and oriented fibres.
Claims51
A filter composed of a multi-ply filter medium comprising:
- a) at least one non-woven stiffening layer of synthetic, polymer fibres,
- a1) the non-woven fabric having a weight per unit area of 10 to 500 g/m2,
- a2) the non-woven fabric having partially oriented and oriented fibres,
- a3) the titre of the oriented fibres ranging from 2 to 12 dtex,
- a4) the titre of the partially oriented fibres ranging from 8 to 25 dtex,
- a5) the non-woven fabric having an air permeability of at least 2500 l/m2sec,
- b) at least one filtration layer which is attached to at least one side of the non-woven stiffening,
- c) at least one covering layer which is attached to the side of the filtration layer remote from the stiffening layer,
- d) where necessary, at least one non-woven microfibre layer.
6 more elements
Dependencies are inferred from the claim text.