# US 8,784,539 B2 · Diesel soot particulate filter cartridge > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,784,539 B2 - Document ID: US8784539B2 - Status: Granted - Kind: B2 - Application number: 13/380,181 - Filed: 2010-06-23 - Published: 2012-05-10 - Granted: 2014-07-22 - Earliest claimed: 2009-06-25 - Assignees: NV Bekaert SA - Applicants: Inge Schildermans; Johan Vandamme; Frank Verschaeve - Inventors: Inge Schildermans; Johan Vandamme; Frank Verschaeve - Web page: https://patentgrep.com/patent/US8784539B2 ## CPC - B01D 39/1653: {of synthetic origin} - B01D 2239/065: More than one layer present in the filtering material - B01D 2239/0695: Wound layers - B01D 2239/1233: Fibre diameter - Y10T 29/49826: Assembling or joining - B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28) - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract The invention relates to diesel soot particulate filter cartridge having a central filter cartridge axis. The filter cartridge has a radial flow. The filter cartridge comprises a porous structure. The porous structure is coiled around the central filter cartridge axis. The porous structure comprises non-sintered metal fibers, said fibers having a roughness being higher than 1.7. The invention further relates to a method of manufacturing a diesel soot particulate filter cartridge. Furthermore the invention relates to a multicartridge diesel soot particulate filter. The flow through the multicartridge diesel soot particulate filter is axial while the flow through the filter cartridges is radial. ## Claims ### Claim 1 A radial diesel soot particulate filter cartridge having a central filter cartridge axis, wherein said filter cartridge comprises a porous structure, wherein said porous structure is coiled around said central filter cartridge axis, wherein said porous structure comprises non-sintered metal fibers, wherein said metal fibers have a roughness higher than 1.7, said roughness being defined as the ratio of the perimeter of a cross-section of one of the metal fibers to the perimeter of a cross-section of an imaginary fiber, wherein said imaginary fiber comprises a fiber having a circular radial cross-section identical in surface area to an average of the surface areas of cross-sections of the one of the metal fibers. ### Claim 2 (depends on 1) A filter cartridge according to claim 1, wherein said filter cartridge has an inlet flow radially inwards said filter cartridge and an outlet flow substantially parallel to said central filter cartridge axis. ### Claim 3 (depends on 1) A filter cartridge according to claim 1, wherein said filter cartridge has an inlet flow substantially parallel to said central filter cartridge axis and an outlet flow radially outwards said filter cartridge. ### Claim 4 (depends on 1) A filter cartridge according to claim 1, wherein said filter cartridge comprises a central conduit, said porous structure being coiled around said central conduit. ### Claim 5 (depends on 1) A filter cartridge according to claim 1, wherein said metal fibers are made from stainless steel. ### Claim 6 (depends on 1) A filter cartridge according to claim 1, wherein said porous structure is a fiber web. ### Claim 7 (depends on 1) A filter cartridge according to claim 1, wherein said porous structure comprises at least one fiber bundle. ### Claim 8 A multicartridge diesel soot particulate filter comprising a number of radial diesel soot particulate filter cartridges, wherein each radial diesel soot particulate filter cartridge has a central filter cartridge axis, wherein each filter cartridge comprises a porous structure, wherein said porous structure is coiled around said central filter cartridge axis, wherein said porous structure comprises non-sintered metal fibers, wherein said metal fibers have a roughness higher than 1.7, said roughness being defined as the ratio of the perimeter of a cross-section of one of the metal fibers to the perimeter of a cross-section of an imaginary fiber, wherein said imaginary fiber comprises a fiber having a circular radial cross-section identical in surface area to an average of the surface areas of cross-sections of the one of the metal fibers, wherein said multicatridge diesel soot particulate filter comprises a casing delimiting the outer boundary of a filter volume, said filter having a central filter axis, said casing having an inflow side and an outflow side defining an average flow direction, said average flow direction being substantially parallel to said central filter axis, said casing being gas impermeable in a radial direction, wherein the central filter cartridge axis of said filter cartridges is substantially parallel to said central filter axis. ### Claim 9 (depends on 8) A multicartridge diesel soot particulate filter according to claim 8, wherein each of said filter cartridges defines a flow in surface Sfi cartridge and a volume Vcartridge, wherein the ratio flow ⁢ ⁢ in ⁢ ⁢ surface ⁢ ⁢ filter ⁢ ⁢ cartridge ⁢ ⁢ S fi ⁢ ⁢ cartridge volume ⁢ ⁢ filter ⁢ ⁢ cartrideV cartridge ranges between 0.01 and 0.1 m2/l. ### Claim 10 (depends on 8) A multicartridge diesel soot particulate filter according to claim 8, wherein the ratio total ⁢ ⁢ flow ⁢ ⁢ in ⁢ ⁢ surface ⁢ ⁢ filter ⁢ ⁢ S fi ⁢ ⁢ total power ⁢ ⁢ of ⁢ ⁢ ⁢ the ⁢ ⁢ engine is ranging between 0.001 m2/kW and 0.01 m2/kW, with said total flow in surface filter Sfi total being the sum of the flow in surfaces Sfi cartridge of the individual filter cartridges of said multicartridge diesel soot particulate filter. ### Claim 11 (depends on 8) A multicartridge diesel soot particulate filter as defined in claim 8 configured for use in engines having a power higher than 350 kW. ### Claim 12 (depends on 1) A filter cartridge according to claim 1, wherein said metal fibers are made from stainless steel alloys comprising Fe, Al and Cr. ### Claim 13 (depends on 1) A filter cartridge according to claim 1, wherein said metal fibers are made from stainless steel comprising Cr, Al and/or Ni and 0.05 to 0.3% by weight of Y, Ce, La, Hf or Ti.