Mann+hummel Gmbh

Filterwerk Mann + Hummel Gmbh

Universitaet Stuttgart Institut Fuer Flugzeugbau

Matthaeus Huber

Guenter Jokschas

Josef Rohrmeier

Norbert Strassenberger

Markus Kolczyk

Helmut Luka

Bruno Sommer

Andreas Beck

Dieter Amesoeder

Nikolaus Moser

Michael Durst

Klaus Drechsler

Gerhard Vilsmaier

Rainer Kehrle

Yves Klett

A method for producing a tight joint between a multi-layer synthetic resin material and a filter medium by selectively melting a layer of the synthetic resin material which has a different thermal absorption capacity in comparison with the other layers by heating the synthetic resin material with infrared radiation, and then fusing the melted synthetic resin layer to the filter medium. A filter element produced by the method of the invention is also disclosed.

Method of producing a tight joint between a multi-layer synthetic material and a filter medium

A filter element () with a tubular folded bag () of folded filter material, which has a plurality of fold blades () adjacent each other in the longitudinal direction () of the folded bag () a closure cover () is attached at at least one axial end () of the folded bag (). In order to provide a filter element which can be bent to any desired curved form while maintaining a high degree of filtration performance, and can be produced in a cost effective manner, the fold blades () of a folded bag () are provided with a combination of diagonal folds extending at an angle relative to each other such that the fold blades () in the longitudinal direction () of the folded bag extend back and forth and thereby form a three-dimensional crown structure (). At least the outer margin of the closure cover () has a form corresponding to the crown structure () of the fold blades ().

Filter element

A cylindrical filter element which comprises a folded filter medium, in particular having a pleated configuration, which is annularly secured to a hollow cylinder, two expanded film axial end plates, and a support tube which is integrated into the cylindrical filter element and upon which the folded filter medium may be affixed. The support tube has an annular components adjacent respective axial end plates which has an interlocking fit with the film end plates and which may be connected to a sealing element.

Cylindrical filter element

A filter cartridge which has an insertable center tube including an upper part ( ) and a lower part ( ) which can be coupled together in the cartridge by a snap fastener ( ). The snap fastener ( ) is configured such that it can be made without undercuts by simple injection molding dies. Therefore the filter cartridge with the center tube according to the invention is very economical.

Filter cartridge with center tube

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Reisbach, Germany

Matthaeus Huber