Gas separation – Two or more separators – Plies or layers of different characteristics or orientation
Patent
1998-03-30
2000-11-14
Smith, Duane S.
Gas separation
Two or more separators
Plies or layers of different characteristics or orientation
55487, 55498, 55521, 55527, 55528, 210491, 2104935, 21046701, B01D 4652
Patent
active
061464368
ABSTRACT:
A cartridge filter having a cylindrical filter element, which is pleated parallel to its axis and is made of a layered non-woven unitary fabric. The fabric is permeable by air flow in the radial direction and is used in fresh air-supply filtration with initial pressure losses of less than 300 Pa at air flow rates through the filter medium of less than 250 m.sup.3 /m.sup.2 h. The non-woven fabric has a mass per unit area of 100 to 500 g/m.sup.2, and a thickness of 1.5-7.0 mm mm. It is made of layered staple fibers of a titer of 0.1 to 50 decitex, which are bonded by a thermally softened binding agent. A bottom layer bordering on the downstream side is contained in the non-woven fabric, having a thickness of 10 to 60% of the overall thickness, and is compressed two to ten times as much as a top layer bordering on the upstream flow side having a thickness of 10-60% of the overall thickness. One or more intermediate layers link the top and bottom layers to one another. The fabric is unitary in structure, in that it is not a composite formed of separate layers which must be subsequently joined together.
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Hollingsworth Anthony
Pfeuffer Peter
Rudolph Antje
Schroth Thomas
Sievert Jorg
Firma Carl Freudenberg
Smith Duane S.
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