Firma Carl Freudenberg

Carl Freudenberg Kg

Peter Pfeuffer

Thomas Schroth

Anthony Hollingsworth

Hans Leibold

Rainer Kaffenberger

Roland Dobner

Hans-Joachim Lippold

Antje Rudolph

Jorg Sievert

Christoph Krambs

Markus Fronh&ouml;fer

Uwe Häfner

Ralf Dieter Poh

A filter element that is able to be sealingly secured in position in a filter housing, comprising an accordion fold pack. The oncoming-flow side of accordion fold pack is covered by a latticed protective mask. The protective mask is sealingly joined to all fold backs of accordion fold pack on the clean-air side. In this manner, the fold edges are protected from damage during the periodic cleaning in the face of the back-blasted air used for that purpose.

Accordion filter with a protective mask

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.

Cartridge filter

Growing community of inventors

Ketsch, Germany

Peter Pfeuffer