CA2682984A1 - Filter with eptfe and method of forming - Google Patents

Filter with eptfe and method of forming Download PDF

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Publication number
CA2682984A1
CA2682984A1 CA002682984A CA2682984A CA2682984A1 CA 2682984 A1 CA2682984 A1 CA 2682984A1 CA 002682984 A CA002682984 A CA 002682984A CA 2682984 A CA2682984 A CA 2682984A CA 2682984 A1 CA2682984 A1 CA 2682984A1
Authority
CA
Canada
Prior art keywords
fluid filter
layer
polyester
media
support scrim
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
CA002682984A
Other languages
French (fr)
Other versions
CA2682984C (en
Inventor
Kyung-Ju Choi
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.)
Daikin Applied Americas Inc
Original Assignee
AAF McQuay Inc
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 AAF McQuay Inc filed Critical AAF McQuay Inc
Publication of CA2682984A1 publication Critical patent/CA2682984A1/en
Application granted granted Critical
Publication of CA2682984C publication Critical patent/CA2682984C/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
    • 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
    • B01D39/163—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous of synthetic origin sintered or bonded
    • 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
    • B01D2239/02—Types of fibres, filaments or particles, self-supporting or supported materials
    • B01D2239/0216—Bicomponent or multicomponent fibres
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/10—Methods of surface bonding and/or assembly therefor
    • Y10T156/1002—Methods of surface bonding and/or assembly therefor with permanent bending or reshaping or surface deformation of self sustaining lamina
    • Y10T156/1007—Running or continuous length work
    • Y10T156/1016—Transverse corrugating
    • Y10T156/1018—Subsequent to assembly of laminae
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/10—Methods of surface bonding and/or assembly therefor
    • Y10T156/1052—Methods of surface bonding and/or assembly therefor with cutting, punching, tearing or severing
    • Y10T156/1082—Partial cutting bonded sandwich [e.g., grooving or incising]

Landscapes

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

Abstract

A filter media product and method of making the same wherein the filter media is pleatable and has at least one support scrim comprised of a melt bonded non-woven material or a fuse bonded non-woven material bonded to a layer of expanded polytetrafluoroethylene. The filter media may have a single support scrim with one or more layers and optionally may have a support scrim on both an upstream and downstream surface where both or neither support scrim is multilayered. The filter media may have an efficiency greater than, equal to, or less than HEPA.

Claims (47)

1. A fluid filter including an upstream and downstream surface and being capable of obtaining a desirable minimum efficiency at a low pressure drop having a media comprising:

a first carded relatively open pleatable support scrim comprised of a melt bonded non-woven material or a fuse bonded non-woven material with 30% to 100% bi-component fibers, and a layer of expanded polytetrafluoroethylene having a first surface bonded to said first support scrim.
2. The fluid filter of claim 1 having a second support scrim bonded to a second surface of said layer of expanded polytetrafluoroethylene.
3. The fluid filter of claim 2 wherein said second support scrim is comprised of a melt bonded non-woven material or a fuse bonded non-woven material.
4. The fluid filter of claim 1 wherein said fluid filter is self supporting.
5. The fluid filter of claim 4 wherein said first support scrim having bicomponent fibers in a range of 30% to 100% has a remainder of fibers being single component fibers.
6. The fluid filter of claim 4 wherein said bicomponent fibers of said first support scrim have high melting portion and low melting portion, said high melting portion being polyester and low melting portion being polyethylene or co-polyester.
7. The fluid filter of claim 6 wherein said bicomponent fibers of said first support scrim have a polyester and a co-polyester.
8. The fluid filter of claim 6 wherein said bicomponent fibers of said first support scrim have a polyester and a polyethylene.
9. The fluid filter of claim 1 wherein said first support scrim is multilayered having a first and second layer, said first layer being bonded to said expanded polytetrafluoroethylene, said second layer being bonded to said first layer.
10. The fluid filter of claim 9 wherein said first layer of said first support scrim has bicomponent fibers with a polyester and a polyethylene and said second layer of said first support scrim has bicomponent fibers with a polyester and a co-polyester.
11. The fluid filter of claim 2 wherein said second support scrim has bicomponent fibers.
12. The fluid filter of claim 11 wherein said bicomponent fibers of said second support scrim have high melting portion and low melting portion, said high melting portion being polyester and low melting portion being polyethylene or co-polyester.
13. The fluid filter of claim 12 wherein said bicomponent fibers of said second support scrim have a polyester and a co-polyester.
14. The fluid filter of claim 12 wherein said bicomponent fibers of said second support scrim have a polyester and a polyethylene.
15. The fluid filter of claim 2 wherein said second support scrim is multilayered having a first and second layer, said first layer being bonded to said expanded polytetrafluoroethylene, said second layer being bonded to said first layer.
16. The fluid filter of claim 15 wherein said first layer of said second support scrim has bicomponent fibers with a polyester and a polyethylene and said second layer of said second support scrim has bicomponent fibers with a polyester and a co-polyester.
17. The fluid filter of claim 1 wherein said media has a Gurley stiffness of at least 500 mg.
18. The fluid filter of claim 1 wherein said media has an efficiency of at most 99.97% at 0.3µ.
19. The fluid filter of claim 1 wherein said media has an efficiency of at least 99.97% at 0.3µ.
20. The fluid filter of claim 1 wherein said media has an efficiency in a range of 40% to 99.999995% at a most penetrating particle size.
21. The fluid filter of claim 1 wherein said media has a permeability in a range of 2 to 400 cfm/sq ft.
22. The fluid filter of claim 1 wherein said first surface is said upstream surface.
23. The fluid filter of claim 1 wherein said first surface is said downstream surface.
24. The fluid filter of claim 1 wherein said first support scrim and said layer of expanded polytetrafluoroethylene have a polymeric material therebetween providing bonding between said first support scrim and said expanded polytetrafluoroethylene.
25. The fluid filter of claim 2 wherein said media has a Gurley stiffness of at least 500 mg.
26. The fluid filter of claim 2 wherein said media has an efficiency of at most 99.97% at 0.3µ .
27. The fluid filter of claim 2 wherein said media has an efficiency of at least 99.97% at 0.3µ.
28. The fluid filter of claim 2 wherein said media has an efficiency in a range of 40% to 99.999995% at a most penetrating particle size.
29. The fluid filter of claim 2 wherein said media has a permeability in a range of 2 to 400 cfm/sq ft.
30. The fluid filter of claim 2 wherein said first surface is said upstream surface.
31. The fluid filter of claim 2 wherein said first surface is said downstream surface.
32. The fluid filter of claim 2 wherein said second support scrim and said layer of expanded polytetrafluoroethylene have a polymeric material therebetween providing bonding between said second support scrim and said expanded polytetrafluoroethylene.
33. A fluid filter having a media comprising:

a carded pleatable first support scrim having a melt bonded non-woven material or a fuse bonded non-woven material, and a layer of expanded polytetrafluoroethylene having a first surface bonded to said first support scrim, said fluid filter media having an efficiency greater than about 40% and less than HEPA.
34. The fluid filter of claim 33 wherein said media has an efficiency is about 80%.
35. The fluid filter of claim 33 wherein said multi-layer first support scrim has a first layer bonded to said first surface of said expanded polytetrafluoroethylene, said first layer of said first support scrim having at least 30% bicomponent fibers.
36. The fluid filter of claim 35 wherein said bicomponent fibers of said first layer of said first support scrim have a polyester and a low melting portion selected from the group consisting of co-polyester and polyethylene.
37. The fluid filter of claim 35 wherein said bicomponent fibers of said first layer of said first support scrim have a polyester and a polyethylene, said multi-layer first support scrim having a second layer bonded to said first layer, said second layer having at least 30% bicomponent fibers with a polyester and a co-polyester.
38. The fluid filter of claim 33 having a second support scrim bonded to a second surface of said expanded polytetrafluoroethylene, said second support having at least 30% bicomponent fibers.
39. The fluid filter of claim 38 wherein said bicomponent fibers of said second support scrim have a polyester and a low melting portion selected from the group consisting of co-polyester and polyethylene.
40. The fluid filter of claim 39 wherein said second support scrim has a first and second layer, said first layer of said second support scrim being bonded to said expanded polytetrafluoroethylene and having at least 30% bicomponent fibers with a polyester and a polyethylene, said second layer of said support scrim having at least 30% bicomponent fibers with a polyester and a co-polyester.
41. A method of making a fluid filter media comprising:

feeding at least one support scrim to a heat roll, wherein said at least one support scrim is a melt bonded non-woven material or a fuse bonded non-woven material;

feeding expanded polytetrafluoroethylene to said heat roll wherein said at least one support scrim contacts said expanded polytetrafluoroethylene;

bonding said expanded polytetrafluoroethylene to said at least one support scrim forming a layered filter media; and pleating said layered media.
42. The method of making a fluid filter media of claim 41 wherein said pleating step is accomplished by feeding said layered media between two cooperating gear wheels.
43. The method of making a fluid filter media of claim 41 wherein said pleating step comprises feeding said layered media between two cooperating scoring wheels.
44. The method of making a fluid filter media of claim 41 wherein said pleating step comprises conveying said layered media from cooperating gear wheels or scoring wheels to an endless belt having a speed less than the speed with which said layered filter media enters said cooperating gear wheels or scoring wheels.
45. A fluid filter media comprising at least one pleatable carded scrim layer bonded to an ePTFE layer, said filter media having an efficiency between about 70%
and 90%, said at least one scrim layer having melt bonded non-woven or fuse bonded non-woven bicomponent fibers.
46. The fluid filter media of claim 45 wherein said at least one scrim layer has at least 30% bicomponent fibers.
47. The fluid filter media of claim 45 wherein said bicomponent fibers of said at least one scrim layer have a polyester and a low melting portion selected from the group consisting of co-polyester and polyethylene.
CA2682984A 2007-04-05 2008-04-02 Filter with eptfe and method of forming Active CA2682984C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US11/696,773 2007-04-05
US11/696,773 US7837756B2 (en) 2007-04-05 2007-04-05 Filter with ePTFE and method of forming
PCT/US2008/059085 WO2008124417A2 (en) 2007-04-05 2008-04-02 Filter with eptfe and method of forming

Publications (2)

Publication Number Publication Date
CA2682984A1 true CA2682984A1 (en) 2009-10-05
CA2682984C CA2682984C (en) 2012-06-26

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
CA2682984A Active CA2682984C (en) 2007-04-05 2008-04-02 Filter with eptfe and method of forming

Country Status (6)

Country Link
US (3) US7837756B2 (en)
EP (1) EP2142276B1 (en)
CA (1) CA2682984C (en)
ES (1) ES2497499T3 (en)
TW (1) TWI367124B (en)
WO (1) WO2008124417A2 (en)

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Also Published As

Publication number Publication date
EP2142276A2 (en) 2010-01-13
WO2008124417A2 (en) 2008-10-16
US20110062077A1 (en) 2011-03-17
US8152889B2 (en) 2012-04-10
EP2142276B1 (en) 2014-06-11
US7837756B2 (en) 2010-11-23
US20110232835A1 (en) 2011-09-29
TW200906471A (en) 2009-02-16
US20080245041A1 (en) 2008-10-09
TWI367124B (en) 2012-07-01
CA2682984C (en) 2012-06-26
ES2497499T3 (en) 2014-09-23
WO2008124417A3 (en) 2009-04-23
US7959705B2 (en) 2011-06-14

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