# US 8,464,877 B2 · Filter module and method for its manufacture > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,464,877 B2 - Document ID: US8464877B2 - Status: Granted - Kind: B2 - Application number: 13/487,893 - Filed: 2012-06-04 - Published: 2012-09-27 - Granted: 2013-06-18 - Earliest claimed: 2001-11-13 - Assignees: Pall Corporation - Applicants: Wolfgang Diemer; Martin Zeiler - Inventors: Wolfgang Diemer; Martin Zeiler - Web page: https://patentgrep.com/patent/US8464877B2 ## CPC - B01D 29/41: mounted transversely on the tube - B01D 29/216: {with wound sheets} - 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) ## Abstract A filter module is formed of wound filter material having openings wherein the boundary surfaces of the openings constitute flow-through surfaces. The openings of the wound layers of the filter material form channels angled relative to the winding axis, wherein one group thereof opens at the outer peripheral surface of the roll and the other group opens at the inner peripheral surface of the roll and wherein the channels on the other end, respectively, are closed and wherein the channels, angled relative to the winding axis, are separated from one another by filter material, and wherein the inner area of the roll has a central channel arranged around a winding axis. ## Claims ### Claim 1 A filter module, comprising a depth filter material with introduced arranged openings having boundary surfaces constituting flow-through surfaces, the depth filter material being wound about a winding axis and forming a spiral roll, wherein the introduced openings, positioned atop one another, of wound layers of the depth filter material form groups of channels angled relative to the winding axis, one group of channels opening at an outer peripheral surface of the spiral roll and the other group of channels opening at an inner peripheral surface of the spiral roll and wherein the channels are closed at their other end, respectively, and the channels, angled relative to the winding axis, are separated from one another by the depth filter material, and wherein the spiral roll has an inner area comprising a central channel arranged around the winding axis; the module having a radial direction wherein, in the radial direction of the filter module, a border layer adjoins the openings and separates the inner area and the outer area from one another, and wherein the border layer comprises depth filter material and has a thickness (a, b) in the radial direction which matches at least the effective filter thickness (d) of a depth filter layer in the axial direction. ### Claim 2 (depends on 1) The filter module according to claim 1 wherein the central channel is cylindrical. ### Claim 3 (depends on 1) The filter module according to claim 1, wherein the openings are formed as slots. ### Claim 4 (depends on 3) The filter module according to claim 3, wherein the filter module has a peripheral direction, and the slots in the peripheral direction of the filter module are interrupted by stays. ### Claim 5 (depends on 3) The filter module according to claim 3, including straps having an at least partially wedge-shaped cross-section, wherein the straps are wound into the filter module and are arranged alongside the slots and compress the filter material in a direction toward the slots. ### Claim 6 (depends on 5) The filter module according to claim 5, wherein the wedge-shaped straps are arranged along the slots opening toward the inner area. ### Claim 7 (depends on 1) The filter module according to claim 1, wherein the flow-through surfaces are arranged perpendicularly to the winding axis in a disc shape around the winding axis. ### Claim 8 (depends on 1) The filter module according to claim 1, wherein the channels are slanted relative to the winding axis at an angle smaller than 90°. ### Claim 9 (depends on 1) The filter module according to claim 1, wherein in the direction of the winding axis, channels opening at the inner peripheral surface and channels opening at the outer peripheral surface are arranged alternatingly. ### Claim 10 (depends on 1) The filter module according to claim 1, wherein the filter module is glued together. ### Claim 11 (depends on 1) The filter module according to claim 1, wherein the filter module is welded together. ### Claim 12 (depends on 1) The filter module according to claim 1, wherein the filter module is held together by clamping and supporting means. ### Claim 13 (depends on 1) The filter module according to claim 1, wherein the filter module is wound onto a support pipe. ### Claim 14 (depends on 1) The filter module according to claim 1, wherein a support material is wound into the filter module. ### Claim 15 (depends on 1) The filter module of claim 1, wherein the depth filter material is glued together. ### Claim 16 (depends on 1) The filter module of claim 1, wherein inner layers of the spiral roll are glued. ### Claim 17 (depends on 1) The filter module of claim 1, wherein outer layers of the spiral roll are glued. ### Claim 18 (depends on 1) The filter module of claim 1, wherein inner layers of the spiral roll are welded. ### Claim 19 (depends on 1) The filter module of claim 1, wherein outer layers of the spiral roll are welded. ### Claim 20 (depends on 1) The filter module of claim 1, wherein the depth filter material is welded together.