Mann+hummel Gmbh

Airbus Deutschland Gmbh

Universitaet Stuttgart Institut Fuer Flugzeugbau

E.i. Dupont De Nemours and Company

Airbus Operations Gmbh

Rainer Kehrle

Mikhail R Levit

Markus Kolczyk

Josef Rohrmeier

Nikolaus Moser

Andreas Beck

Matthaeus Huber

Michael Durst

Klaus Drechsler

Yves Klett

Olivier Lengwiler

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 folded core structure is produced by embossing fold lines into a flat planar material web, initiating folds along the fold lines on the upper and lower surfaces of the material web, proceeding with the formation of the folds along the fold lines to deform the material web from its two-dimensional starting configuration to a three-dimensional folded configuration, and post-processing the folded material web to stabilize or fix the folded configuration thereof. A composite structural panel is produced by bonding a cover layer onto at least one surface of the folded core structure. An apparatus preferably includes embossing or creasing rolls to form the fold lines in the material web, air nozzles or folding rolls to initiate the folding process, bristle brush rolls to complete the folding process, and further folding rolls to enhance and fix the folded configuration, optionally in connection with heating, cooling, applying a coating onto, or impregnating a resin or binder into the material web.

Method and apparatus for producing a composite structural panel with a folded material core

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Stuttgart, Germany

Rainer Kehrle