CA2690076A1 - Multiple layer filter media - Google Patents

Multiple layer filter media Download PDF

Info

Publication number
CA2690076A1
CA2690076A1 CA2690076A CA2690076A CA2690076A1 CA 2690076 A1 CA2690076 A1 CA 2690076A1 CA 2690076 A CA2690076 A CA 2690076A CA 2690076 A CA2690076 A CA 2690076A CA 2690076 A1 CA2690076 A1 CA 2690076A1
Authority
CA
Canada
Prior art keywords
filter media
layer
portions
region
filter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA2690076A
Other languages
French (fr)
Other versions
CA2690076C (en
Inventor
Richard Gebert
Wai Sing Poon
Steve Stark
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
WL Gore and Associates Inc
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of CA2690076A1 publication Critical patent/CA2690076A1/en
Application granted granted Critical
Publication of CA2690076C publication Critical patent/CA2690076C/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/52—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material
    • B01D46/521—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material using folded, pleated material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
    • B01D39/1607—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous
    • B01D39/1623—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous of synthetic origin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
    • B01D39/1692—Other shaped material, e.g. perforated or porous sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/54—Particle separators, e.g. dust precipitators, using ultra-fine filter sheets or diaphragms
    • B01D46/543—Particle separators, e.g. dust precipitators, using ultra-fine filter sheets or diaphragms using membranes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
    • B01D2239/065—More than one layer present in the filtering material
    • B01D2239/0668—The layers being joined by heat or melt-bonding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2275/00—Filter media structures for filters specially adapted for separating dispersed particles from gases or vapours
    • B01D2275/10—Multiple layers

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
  • Filtering Materials (AREA)
  • Laminated Bodies (AREA)

Abstract

The invention provides a multiple layer filter media for removal of particles from a fluid stream. The multiple layer filter media may include a depth filtration layer, a membrane filtration layer and a support layer. Additional layers may be present.
The membrane filtration layer may comprise expanded polytetrafluoroethylene (ePTFE). The various layers of the multiple layer filter media may be bonded together through a plurality of point bonds. The point bonding process may include simultaneously bonding multiple layers of the multiple layer filter media together in a single operation. The point bonds may be created using ultrasonic bonding.

Claims (46)

1. Filter media comprising:

a first material comprising a first thermoplastic;
a second filter material; and a third material comprising a second thermoplastic;

wherein in a first region of said filter media, at least portions of said first material are separately disposed in a first layer, at least portions of said second filter material are separately disposed in a second layer, and at least portions of said third material are separately disposed in a third layer;

wherein said second layer is disposed between said first and third layers in said first region of said filter media; and wherein in at least one second region of said filter media, at least portions of said first material and said second filter material, and at least portions of said first material and said third material, are directly bonded to define a continuous bond therebetween.
2. The filter media of Claim 1, wherein said second layer has an air permeability of at least 4 Frazier.
3. The filter media of Claim 2, wherein said second layer has a water entry pressure of greater than 0.5 PSI.
4. The filter media of Claim 3, wherein said second filter material comprises ePTFE, wherein said second layer comprises a first ePTFE membrane.
5. The filter media of Claim 4, wherein said first material is a filter material, wherein at least portions of said first material are disposed in a meltblown polymeric web, wherein said first material comprises a material selected from a group consisting of polypropylene, polyester, nylon, and polyethylene.
6. The filter media of Claim 5, wherein said third material is a support material, wherein at least portions of said third material are disposed in fibers, wherein said fibers are selected from a group consisting of spunbond fibers, hydroentangled fibers, and wet laid fibers.
7. The filter media of Claim 6, wherein said third material comprises a material selected from a group consisting of polyester, nylon, polypropylene, and polyethylene.
8. The filter media of Claim 6, wherein said second layer comprises a second ePTFE
membrane.
9. The filter media of Claim 5, wherein said third material provides structural support for said filter media, wherein said third material comprises cellulose fibers and a thermoplastic binder, selected from a group consisting of phenolic, acrylic, and poly-vinyl acetate.
10. The filter media of Claim 5, wherein at least portions of said third material are disposed in a permeable thermoplastic web, wherein said third material comprises a material selected from a group consisting of polypropylene, polyester, nylon, polyethylene and polyurethane.
11. The filter media of Claim 4, wherein at least portions of said first material are disposed in a permeable thermoplastic web, wherein said first material comprises a material selected from a group consisting of polypropylene, polyester, nylon, polyethylene and polyurethane.
12. The filter media of Claim 11, wherein said third material is a support material, wherein at least portions of said third material are disposed in fibers, wherein said fibers are selected from a group consisting of spunbond fibers, hydroentangled fibers, and wet laid fibers.
13. The filter media of Claim 12, wherein said third material comprises a material selected from a group consisting of polyester, nylon, polypropylene, and polyethylene.
14. The filter media of Claim 11, wherein said third material provides structural support for said filter media, wherein said third material comprises cellulose fibers and a thermoplastic binder, selected from a group consisting of phenolic, acrylic, and poly-vinyl acetate.
15. The filter media of Claim 3, wherein said second layer has a water entry pressure of greater than 1.5 PSI.
16. The filter media of Claim 2, wherein said second layer has an air permeability of at least 10 Frazier.
17. The filter media of Claim 1, wherein first, second and third layers are free from being bonded to each other in said first region of said filter media.
18. The filter media of Claim 17, wherein said first material has a first melting point, wherein said second filter material has a second melting point, wherein said third material has a third melting point, and wherein said first and third melting points are lower than said second melting point.
19. The filter media of Claim 18, wherein a ratio of the area of said first region to the total area of area all of said second regions is at least 9 to 1.
20. The filter media of Claim 19, wherein a ratio of the area of said first region to the total area of area all of said second regions is at least 32 to 1.
21. The filter media of Claim 1, wherein said continuous bond has a minimum thickness that is less than 50 percent of a maximum thickness of said filter media in said first region.
22. The filter media of Claim 1, wherein in said at least one second region of said filter media, at least portions of said first material, at least portions of said second filter material, and at least portions of said third material, are directly bonded to define a continuous bond therebetween.
23. The filter media of Claim 1, wherein said continuous bond restricts any of the layers of the filter media from being removed without damaging any of the other layers of the filter media.
24. The filter media of Claim 1, wherein said filter media has a specific quality of at least about 0.8 1/krayls at 0.1 µm DOP particle at 2.5 cm/s air velocity.
25. The filter media of Claim 1, wherein said filter media has a dust loading capacity greater than about 10 g/m2.
26. The filter media of Claim 1, wherein said filter media is folded to form pleats.
27. The filter media of Claim 26, wherein a maximum cross dimension of one of said at least one second regions is less than twice a minimum thickness of said filter media in said first region.
28. The filter media of Claim 1, further comprising a fourth layer comprising a meltblown fibrous web, wherein said third layer is disposed between said second and fourth layers.
29. The filter media of Claim 28, further comprising a fifth layer comprising a spun bond thermoplastic fibrous web, wherein said fourth layer is disposed between said third and fifth layers.
30. The filter media of Claim 1, further comprising a plurality of said second regions.
31. The filter media of Claim 30, wherein each of said plurality of said second regions defines a point bond.
32. The filter media of Claim 31, wherein said point bonds are ultrasonic bonds.
33. The filter media of Claim 30, wherein said second layer has an air permeability of at least 4 Frazier.
34. The filter media of Claim 33, wherein said second layer has a water entry pressure of greater than 0.5 PSI.
35. The filter media of Claim 34, wherein said second material comprises ePTFE, wherein said second layer comprises a first ePTFE membrane.
36. The filter media of Claim 34, wherein said second layer has a water entry pressure of greater than 1.5 PSI.
37. The filter media of Claim 33, wherein said second layer has an air permeability of at least 10 Frazier.
38. The filter media of Claim 30, wherein a ratio of the area of said first region to the total area of area all of said second regions is at least 9 to 1.
39. The filter media of Claim 38, wherein a ratio of the area of said first region to the total area of area all of said second regions is at least 32 to 1.
40. A method of making a filter media, the method comprising the steps of:
positioning a first layer comprising a first thermoplastic material, a second layer comprising a second filter material, and a third layer comprising a third thermoplastic material, wherein said first, second and third layers are separately disposed in adjacent face-to-face relation across a lateral extent, wherein said second layer is disposed between said first and third layers; and applying energy to at least one selected region of said lateral extent, wherein said applying step causes portions of said first thermoplastic material to be bonded with portions of said third thermoplastic material within said at least one selected region of said lateral extent thereby defining a continuous bond therebetween.
41. The method of Claim 40, wherein said applying step includes applying energy to a plurality of said selected regions.
42. The method of Claim 41, wherein each of said plurality of said selected regions defines a point bond.
43. The method of Claim 40, wherein said applying step includes heating said positioned first, second, and third layers to a temperature, wherein said temperature is above a melting point of said first layer and a melting point of said third layer, and wherein said temperature is below a melting point of said second layer.
44. The method of Claim 43, wherein said energy includes ultrasonic energy.
45. The method of Claim 40, wherein after said applying step, said first, second and third layers are free from bonding to each other outside of said selected region of said lateral extent.
46. The method of Claim 40, wherein said applying step includes flowing at least a portion of said first thermoplastic material though said second layer and into said third layer within said selected region of said lateral extent.
CA2690076A 2007-06-08 2008-06-02 Multiple layer filter media Active CA2690076C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US11/760,433 US8147583B2 (en) 2007-06-08 2007-06-08 Multiple layer filter media
US11/760,433 2007-06-08
PCT/US2008/007030 WO2008153878A2 (en) 2007-06-08 2008-06-02 Multiple layer filter media

Publications (2)

Publication Number Publication Date
CA2690076A1 true CA2690076A1 (en) 2008-12-18
CA2690076C CA2690076C (en) 2012-05-08

Family

ID=39941416

Family Applications (1)

Application Number Title Priority Date Filing Date
CA2690076A Active CA2690076C (en) 2007-06-08 2008-06-02 Multiple layer filter media

Country Status (8)

Country Link
US (1) US8147583B2 (en)
EP (1) EP2160230B1 (en)
JP (3) JP2010528844A (en)
KR (1) KR101152511B1 (en)
CN (1) CN101754792B (en)
AU (1) AU2008262432B2 (en)
CA (1) CA2690076C (en)
WO (1) WO2008153878A2 (en)

Families Citing this family (35)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7981184B2 (en) * 2007-03-16 2011-07-19 3M Innovative Properties Company Fluid filter
US8066790B2 (en) * 2007-03-16 2011-11-29 3M Innovative Properties Company Fluid filter cartridge and housing
PL2304326T3 (en) * 2008-01-14 2019-05-31 Core Energy Recovery Solutions Inc Cross-pleated membrane cartridges, and method for making cross-pleated membrane cartridges
US8673040B2 (en) 2008-06-13 2014-03-18 Donaldson Company, Inc. Filter construction for use with air in-take for gas turbine and methods
US7648542B1 (en) * 2008-10-13 2010-01-19 Bgf Industries, Inc. Static dissipative glass filtration fabric
JP5875180B2 (en) * 2008-12-05 2016-03-02 イー・アイ・デュポン・ドウ・ヌムール・アンド・カンパニーＥ．Ｉ．Ｄｕ Ｐｏｎｔ Ｄｅ Ｎｅｍｏｕｒｓ Ａｎｄ Ｃｏｍｐａｎｙ Improved filter media with nanoweb layers
SG10201605780QA (en) 2009-03-19 2016-09-29 Emd Millipore Corp Removal of microorganisms from fluid samples using nanofiber filtration media
US9054144B2 (en) * 2009-12-10 2015-06-09 Entegris, Inc. Porous barrier for evenly distributed purge gas in a microenvironment
DE102010014060A1 (en) 2010-04-07 2011-10-13 Mahle International Gmbh Winding filter element for removing impurity from fluid stream e.g. gas flow, of internal combustion engine, has material arrangement including planar filter material, and multilayer filter material comprising membrane and carrier layers
US11154821B2 (en) 2011-04-01 2021-10-26 Emd Millipore Corporation Nanofiber containing composite membrane structures
DK2732021T3 (en) * 2011-07-08 2020-07-27 Emd Millipore Corp IMPROVED DEPTH FILTERS FOR BIO-TECHNOLOGICAL DISPOSAL PROCEDURES
EP2785431B1 (en) 2011-12-02 2016-03-16 W.L. Gore & Associates, Inc. Heat-stabilized composite filter media and method of making the filter media
CA2862359C (en) 2012-01-05 2016-12-20 Tdc Filter Manufacturing, Inc. Waterproof and salt repellant media and filter
EP2840115B1 (en) * 2012-04-20 2018-06-06 Daikin Industries, Ltd. Composition mainly composed of ptfe, mixed powder, molding material, filtering medium for filter, air filter unit, and porous membrane manufacturing method
USD698017S1 (en) 2012-07-25 2014-01-21 Tdc Filter Manufacturing, Inc. Filter adaptor
US9205359B2 (en) 2012-10-09 2015-12-08 W.L. Gore & Associates, Inc. V-panel filters
ES2911692T3 (en) * 2013-08-23 2022-05-20 American Air Filter Company Inc Canister filter with prefiltration
US10179426B2 (en) 2013-11-06 2019-01-15 Bl Technologies, Inc. Large format melt-blown depth filter cartridge
US11845019B2 (en) 2013-11-06 2023-12-19 Bl Technologies, Inc. Large format melt-blown depth filter cartridge
IN2014MU00659A (en) 2014-02-25 2015-09-25 Mann & Hummel Gmbh
US9737855B2 (en) * 2014-06-17 2017-08-22 W. L. Gore & Associates, Inc. Filtration article containing a filtration material containing fibrous layers having different lengths
US10343095B2 (en) * 2014-12-19 2019-07-09 Hollingsworth & Vose Company Filter media comprising a pre-filter layer
EP3256237B1 (en) * 2015-02-13 2021-03-31 W. L. Gore & Associates, Inc. Venting apparatus
KR20170113638A (en) 2015-04-17 2017-10-12 이엠디 밀리포어 코포레이션 A method for purifying a biological material of interest in a sample using nanofiber ultrafiltration membranes operating in tangential flow filtration mode
EP3288663A1 (en) 2015-04-28 2018-03-07 General Electric Company Melt-blown depth filter element, method and machine of making it
EP3374053A1 (en) 2015-11-13 2018-09-19 W. L. Gore & Associates, Inc. Support members for filter pleated media
DE102016209482A1 (en) * 2016-05-31 2017-11-30 Mahle International Gmbh Process for producing a filter medium and filter medium
US11117079B2 (en) * 2017-01-20 2021-09-14 Champion Laboratories, Inc. Filter packs, processes for making filter packs, and air filters comprising filter packs
WO2018152683A1 (en) * 2017-02-22 2018-08-30 W. L. Gore & Associates, Inc. Layered filter assembly for enclosure protection
CN107115730B (en) * 2017-06-29 2022-08-26 上海市建筑科学研究院(集团)有限公司 Can present air purifier who sets for pattern along with purifying process
KR102290858B1 (en) * 2019-08-02 2021-08-20 (주)크린앤사이언스 Composite filter material and manufacturing method thereof
US20210379518A1 (en) * 2020-06-08 2021-12-09 W. L. Gore & Associates, Inc. Filter media and methods of making and using
KR20220017163A (en) * 2020-08-04 2022-02-11 박이빛 Mask with ePTFE membrane
DE102021115022A1 (en) 2021-06-10 2022-12-15 Mann+Hummel Gmbh Pleated filter medium
JP2023025511A (en) * 2021-08-10 2023-02-22 帝人株式会社 laminated film

Family Cites Families (42)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE392582B (en) 1970-05-21 1977-04-04 Gore & Ass PROCEDURE FOR THE PREPARATION OF A POROST MATERIAL, BY EXPANDING AND STRETCHING A TETRAFLUORETENE POLYMER PREPARED IN AN PASTE-FORMING EXTENSION PROCEDURE
US4114447A (en) * 1976-02-09 1978-09-19 La Barge, Inc. Temperature indicating apparatus
US4878930A (en) 1984-03-15 1989-11-07 W. L. Gore & Associates, Inc. Filter cartridge
GB8503749D0 (en) 1985-02-14 1985-03-20 Craig Med Prod Ltd Gas filter
US5019140A (en) 1988-12-21 1991-05-28 W. L. Gore & Associates, Inc. Irradiated expanded polytetrafluoroethylene composites, and devices using them, and processes for making them
JP2788976B2 (en) 1989-04-26 1998-08-20 ジャパンゴアテック株式会社 Filter material
GB8912701D0 (en) 1989-06-02 1989-07-19 Hyman Int Ltd Production of porous materials
US4963170A (en) 1989-12-04 1990-10-16 Global Consumer Services, Inc. Inflow and outflow HEPA vent filter for asbestos work areas
US5108474A (en) 1991-01-03 1992-04-28 W. L. Gore & Associates, Inc. Smoke filter
US5096473A (en) * 1991-03-01 1992-03-17 W. L. Gore & Associates, Inc. Filtration fabric laminates
US5114447A (en) 1991-03-12 1992-05-19 Mott Metallurgical Corporation Ultra-high efficiency porous metal filter
US5560974A (en) * 1991-03-22 1996-10-01 Kappler Safety Group, Inc. Breathable non-woven composite barrier fabric and fabrication process
US5240479A (en) 1991-05-17 1993-08-31 Donaldson Company, Inc. Pleated filter media having a continuous bead of adhesive between layers of filtering material
US5238477A (en) 1992-01-06 1993-08-24 Layton Howard M Hepa filter unit having a metallic membrane
US5158586A (en) 1992-01-06 1992-10-27 Layton Howard M Hepa filter unit having a metallic membrane
US5207812B1 (en) 1992-05-08 1996-10-01 Gore & Ass Filter cartridge
JPH06311A (en) 1992-06-22 1994-01-11 Japan Gore Tex Inc Filtering material
US5753343A (en) * 1992-08-04 1998-05-19 Minnesota Mining And Manufacturing Company Corrugated nonwoven webs of polymeric microfiber
EP0600709B1 (en) * 1992-12-01 2000-03-29 Canon Kabushiki Kaisha Range-image processing apparatus and method
US5522908A (en) 1994-05-27 1996-06-04 Hmi Industries, Inc. Filter bag for a vacuum cleaner
US5507847A (en) * 1994-07-29 1996-04-16 W. L. Gore & Associates, Inc. ULPA filter
JP3465761B2 (en) * 1994-10-26 2003-11-10 東洋紡績株式会社 Electret filter
US5814405A (en) 1995-08-04 1998-09-29 W. L. Gore & Associates, Inc. Strong, air permeable membranes of polytetrafluoroethylene
JPH10314520A (en) * 1997-05-16 1998-12-02 Japan Vilene Co Ltd Filtration material and filter in which the material is used
JP2000079332A (en) 1998-07-08 2000-03-21 Nitto Denko Corp Filter medium for air filter
DE19851667C2 (en) 1998-11-10 2002-07-04 Coronor Composites Gmbh Multi-layer composite material
US6334881B1 (en) 1999-04-20 2002-01-01 Gore Enterprise Holdings, Inc. Filter media
JP4467114B2 (en) * 1999-12-10 2010-05-26 東燃化学株式会社 Multilayer composite film
JP2001179016A (en) * 1999-12-22 2001-07-03 Kanai Hiroaki Air cleaning filter medium and filter
US6409785B1 (en) 2000-08-07 2002-06-25 Bha Technologies, Inc. Cleanable HEPA filter media
JP2002136812A (en) * 2000-11-01 2002-05-14 Nitto Denko Corp Laminate for bag filter and bag filter using the same
DE10120223B4 (en) 2001-04-24 2005-08-25 Carl Freudenberg Kg Multi-layer air filter and its use
EP1266681B1 (en) 2001-06-13 2013-12-25 Nitto Denko Corporation Filter medium for turbine and methods of using and producing the same
EP2279783A1 (en) * 2001-12-08 2011-02-02 IBS Filtran Kunststoff-/Metallerzeugnisse GmbH Multilayered composite filter medium for filtration in series
US20030145566A1 (en) 2002-02-04 2003-08-07 Parks David P. Disposable filtration bag
DE10225909B4 (en) 2002-06-11 2005-08-04 Intensiv-Filter Gmbh & Co. Kg Method for producing a tube filter by winding and tube filter
JP2005177641A (en) * 2003-12-19 2005-07-07 Nitto Denko Corp Air filter unit, its manufacturing method and its assembly
US20050148261A1 (en) * 2003-12-30 2005-07-07 Kimberly-Clark Worldwide, Inc. Nonwoven webs having reduced lint and slough
JP2005205305A (en) * 2004-01-22 2005-08-04 Nitto Denko Corp Air filter medium
US7138057B2 (en) 2004-07-22 2006-11-21 Gore Enterprise Holdings, Inc. Filter media
DK1674144T3 (en) * 2004-12-23 2007-11-05 Gore W L & Ass Gmbh Air filter for a turbine
JP2007075739A (en) * 2005-09-14 2007-03-29 Nitto Denko Corp Filter unit and method for use of filter medium

Also Published As

Publication number Publication date
US8147583B2 (en) 2012-04-03
CA2690076C (en) 2012-05-08
US20080302074A1 (en) 2008-12-11
EP2160230A2 (en) 2010-03-10
KR20100024480A (en) 2010-03-05
AU2008262432A1 (en) 2008-12-18
JP2015221438A (en) 2015-12-10
AU2008262432B2 (en) 2011-11-03
CN101754792B (en) 2012-11-28
JP2010528844A (en) 2010-08-26
JP2013146730A (en) 2013-08-01
EP2160230B1 (en) 2015-05-20
JP5856094B2 (en) 2016-02-09
WO2008153878A2 (en) 2008-12-18
KR101152511B1 (en) 2012-07-03
CN101754792A (en) 2010-06-23
WO2008153878A3 (en) 2009-04-09

Similar Documents

Publication Publication Date Title
CA2690076A1 (en) Multiple layer filter media
EP2398633B1 (en) Multi-layer, fluid transmissive fiber structures containing nanofibers and a method of manufacturing such structures
US9630148B2 (en) Filter compound material, method for the production thereof and flat filter elements made of the filter compound material
US10376822B2 (en) Filter element, air cleaner, and methods
CA2282856C (en) Air filter
CA2682984A1 (en) Filter with eptfe and method of forming
JP5784458B2 (en) Air filter media
CN101963102A (en) Use the high-performance gas turbine inlet filter (HEPA) of thin film dielectrics
TW200938290A (en) Air filter
US8343251B2 (en) Composite filter media
JP2005512781A (en) Multi-layer composite filter element for in-line filtration
JP5379935B2 (en) Pleated filter cartridge for liquid
JP2007107126A (en) Laminated non-woven fabric
CN110809492A (en) Filter medium and use thereof
JP2006175352A (en) Filtering medium for filters
KR100712258B1 (en) Non-woven fabric for filter and filter for engine
KR20150079105A (en) PTFE filter media and production method thereof
JP5165328B2 (en) Filter manufacturing method
JP2003117363A (en) Production method of high permeable filtration material and product thereof

Legal Events

Date Code Title Description
EEER Examination request