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US 8,147,584 B2Granted
Filter medium
AssigneeJohns Manville
InventorsChristian Hassmann, Hans-Jurgen Meitinger, Kurt Ploetz, Juergen Umminger, Michael Schoeps
Life of this patent
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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 fibers of synthetic polymers and the fibers being both partially oriented and oriented fibers.
Claims9
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 stiffening layer that is configured to be pleatable,
- a2) the non-woven stiffening layer 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 stiffening layer having an air permeability of at least 2500 l/m2 sec,
- b) at least one filtration layer which is attached to at least one side of the non-woven stiffening layer,
- c) at least one covering layer which is attached to the side of the filtration layer remote from the stiffening layer.
5 more elements
A method for manufacturing the filter, comprising the following steps:
- a) providing a non-woven stiffening layer that comprises partially oriented and oriented fibres, wherein the titre of the oriented fibres ranges from 2 to 12 dtex, wherein the titre of the partially oriented fibres ranges from 8 to 25 dtex, and wherein the non-woven stiffening layer has an air permeability of at least 2500 l/m2 sec,
- b) attaching a filtration layer to one side of the non-woven stiffening layer,
- c) attaching a covering layer to a side of the filtration layer that is remote from the stiffening layer.
Dependencies are inferred from the claim text.