Nv Bekaert Sa

Eddy Lambert

Inge Schildermans

Gabriel Dewaegheneire

Frank Verschaeve

Johan Vandamme

Feng Mei

A filter medium () having an inflow side () and an outflow side () defining a flow direction (). The filter medium comprises at least n consecutive layers Lx of fiber media, x varying from 1 to n, n being more than or equal to 2. L() is the layer of the n consecutive layers closest to the inflow side of the filter medium and Ln () is the layer of the n consecutive layers closest to the -outflow side of the filter medium. For all layers Lx of the at least n consecutive layers, the ratio Hx/(kx*Ax) is substantially identical, wherein Hx is the average thickness of the layer Lx in flow direction, Ax is the average surface area of cross sections according to planes perpendicular to the flow direction, and kx is the permeability coefficient of this layer Lx. The fiber media of at least part of the layers of the filter medium comprises metal fibers.

Filter medium

A diesel soot particulate filter medium, as subject of the invention comprises fibers, preferably metal fibers. The diesel soot particulate filter medium has a thickness T between its inflow side and its outflow side being equal or more than 5 cm. The S/V at the inflow side is preferably more than 50 m/mand the S/V at the outflow side is preferably less than 80000 m/m, whereas S/V increases stepwise or gradually from the inflow side to the outflow side. S is the sum of all mantle surface of the fibers present in a volume V.

Diesel soot particulate filter medium

A burner membrane has at least one layer consisting of a compressed, needled fiber web with a porosity of between 60% and 95%, and that is constructed of heat-resistant stainless steel fibers. A method for its manufacture includes the steps of providing a fiber web composed of heat-resistant stainless steel fibers, needling the fiber web, and compressing the needled fiber web to the desired porosity.

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Deerlijk, Belgium

Eddy Lambert