Firma Carl Freudenberg

Carl Freudenberg Kg

Anthony Hollingsworth

Klaus Veeser

Robert Groten

Oliver Staudenmayer

Thomas Schroth

Arun Prasad Venugopal

Dirk Dantz

Peter Pfeuffer

Klaus-Dietmar Wagner

Heiko Manstein

Joachim Hendler

Ingrid Ewald

Ralph Berkemann

Antje Rudolph

Jorg Sievert

Michaela Rau

Alexander Kolew

Johanna SPÖRL

The invention relates to a multi-layer composite for use in an air filter, comprising at least one upstream ply and a support ply that is connected to the upstream ply. The upstream ply is made of a non-woven fabric and has a finer porosity than the support ply. The aim of the invention is to form and further develop a multi-layer composite for use in an air filter, in particular in a filter bag in such a manner that the upstream ply can be connected in a stable and economical manner to the support ply. The invention is characterised in that the upstream ply is embodied as a spun bonded non-woven, the continuous filaments of which are at least partially twisted or interwoven with the support ply.

Multi-layer composite for use in an air filter

A method for producing a pleated filter material from a nonwoven fabric having spacers for the pleated folds formed from the filter material itself, a formed fabric made of stretched synthetic fibers and thermoplastic and/or thermally cross-linked binding agent being heated in an oven to a temperature lying at least in the softening temperature range and/or the cross-linking temperature range of the binding agent, and subsequently, the formed fabric being formed between profiled calender rolls and cooled simultaneously.

Method for producing a pleatable filter material from a nonwoven fabric

An air filter having a depth filter material which includes a nonwoven fabric having a upstream side and a downstream side. The nonwoven fabric is formed of adhesively and/or cohesively bonded fibers, the fibers having intertwinements which are produced by liquid-jetting from the downstream side prior to the adhesive and/or cohesive bonding, and the fibers, because of the liquid-jetting, being compacted increasingly from the upstream side toward the downstream side in such a way that differently compacted regions are formed, in which particles of different size can be separated.

Depth air filter having fibers intertwined by liquid-jetting

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

Birkenau, Germany

Anthony Hollingsworth