US20010037540A1 - Filtration device and process for its manufacture - Google Patents

Filtration device and process for its manufacture Download PDF

Info

Publication number
US20010037540A1
US20010037540A1 US09/202,147 US20214798A US2001037540A1 US 20010037540 A1 US20010037540 A1 US 20010037540A1 US 20214798 A US20214798 A US 20214798A US 2001037540 A1 US2001037540 A1 US 2001037540A1
Authority
US
United States
Prior art keywords
fibres
web
process according
group
filtration device
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
US09/202,147
Other versions
US6440192B2 (en
Inventor
Valeo Paris
Claude Legrand
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.)
VALEO
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
Assigned to VALEO reassignment VALEO ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: GUERIN, RICHARD, LEGRAND, CLAUDE
Publication of US20010037540A1 publication Critical patent/US20010037540A1/en
Assigned to VALCO reassignment VALCO CORRECTIVE ASSIGNMENT TO CORRECT THE ADDRESS OF THE ASSIGNEE. FILED ON 12/09/1998, RECORDED ON REEL 010064 FRAME 0838 ASSIGNOR HEREBY CONFIRMS THE ASSIGNMENT OF THE ENNTIRE INTEREST. Assignors: GUERIN, RICHARD, LEGRAND, CLAUDE
Application granted granted Critical
Publication of US6440192B2 publication Critical patent/US6440192B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60HARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H3/00Other air-treating devices
    • B60H3/06Filtering
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D39/00Filtering material for liquid or gaseous fluids
    • B01D39/14Other self-supporting filtering material ; Other filtering material
    • B01D39/16Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
    • B01D39/1607Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous
    • B01D39/1623Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous of synthetic origin
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D39/00Filtering material for liquid or gaseous fluids
    • B01D39/14Other self-supporting filtering material ; Other filtering material
    • B01D39/20Other self-supporting filtering material ; Other filtering material of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
    • B01D39/2003Glass or glassy material
    • B01D39/2017Glass or glassy material the material being filamentary or fibrous
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D39/00Filtering material for liquid or gaseous fluids
    • B01D39/14Other self-supporting filtering material ; Other filtering material
    • B01D39/20Other self-supporting filtering material ; Other filtering material of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
    • B01D39/2027Metallic material
    • B01D39/2041Metallic material the material being filamentary or fibrous
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D46/00Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/10Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F8/00Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying
    • F24F8/10Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering
    • F24F8/108Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering using dry filter elements
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F8/00Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying
    • F24F8/10Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S55/00Gas separation
    • Y10S55/05Methods of making filter

Definitions

  • the present invention concerns a process for manufacturing a filtration device more particularly intended for filtering gases such as air for ventilating and/or heating and/or air conditioning rooms or motor vehicles.
  • the invention also concerns a filtration device manufactured by the above process.
  • Prior art filtration devices are made by spinning a thermoplastics polymer through nozzles to produce an intermingling of the filaments issuing from the nozzles forming, after cooling, a lap that can constitute a particle filter.
  • the filters obtained in this way have a high specific gravity and a high unit cost.
  • the process for manufacturing a filtration device of the aforementioned type in accordance with the invention is characterised in that it comprises an operation of carding fibres having a length in the range 38 mm to 120 mm and a diameter greater than 10 ⁇ m to form an isotropic web and in that said web is subjected to a mechanical consolidation operation by means of hydraulic binding consisting in passing very fine water jets at a high pressure through the web disposed on a rotating drum followed by a drying operation.
  • the carding operation is carried out using a wool type card
  • said card incorporates “Dispelmel” type randomising units
  • the pressure of the water jets used for the hydraulic binding is in the range 40 bars to 200 bars;
  • the parameters of the card are chosen to obtain a web having a mass per unit surface area in the range approximately 20 g/m 2 to approximately 150 g/m 2 .
  • the filtration device of the above type is characterised in that it comprises an isotropic web.
  • said web is in a single layer
  • the length of said fibres is at least equal to 38 mm;
  • the length of said fibres is at most equal to 120 mm;
  • the average diameter of said fibres is at least equal to 10 ⁇ m
  • said fibres are fibres of the same kind or a mixture of different fibres.
  • said fibres are selected from the group of thermoplastics fibres such as fibres of polypropylene, polyethylene, polyester, polycarbonate, polyamide, the group of acrylic fibres, pre-oxidised acrylic fibres, the group of aramide fibres, the group of phenolic fibres, the group of fluorocarbon fibres, the group of mineral fibres such as glass fibres and the group of metal fibres.
  • thermoplastics fibres such as fibres of polypropylene, polyethylene, polyester, polycarbonate, polyamide, the group of acrylic fibres, pre-oxidised acrylic fibres, the group of aramide fibres, the group of phenolic fibres, the group of fluorocarbon fibres, the group of mineral fibres such as glass fibres and the group of metal fibres.
  • the invention provides a filtration device that is efficient and of lower unit cost and of lower specific gravity than the prior art filtration devices.
  • 1.7 Tex (14 ⁇ m diameter) polypropylene fibres are cut to a length of 40 mm and then introduced into a mixer.
  • the fibre mixture obtained is then carded by means of a two-doffer wool type card equipped with a “Dispelmel” type randomising unit to obtain an isotropic web.
  • the web leaving the card is introduced into a condenser to form a single layer lap.
  • the parameters of the card and/or of the condenser are selected to produce a web or a lap having a mass per unit surface area in the range approximately 20 g/m 2 to approximately 150 g/m 2 .
  • the web or lap is deposited onto a belt and then consolidated by a hydraulic binding operation.
  • the hydraulic binding operation consists in passing very fine water jets at a high pressure (in the range 40 bars to 200 bars) through the web or lap disposed on a rotating drum.
  • the web or lap is mounted on a support to form the filtration device.
  • the particles corresponded to a “fine SAE powder” defined in US Standard SAE J 726/ISO 5011.
  • the particle concentration was 100 mg/m 3 .

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Filtering Materials (AREA)
  • Nonwoven Fabrics (AREA)

Abstract

Disclosed is a process for manufacturing a filtration device. The process includes a fiber carding procedure which forms a web. The filtration device in accordance with the invention takes the form of a web consisting of a single layer lap.

Description

  • The present invention concerns a process for manufacturing a filtration device more particularly intended for filtering gases such as air for ventilating and/or heating and/or air conditioning rooms or motor vehicles. [0001]
  • The invention also concerns a filtration device manufactured by the above process. [0002]
  • Prior art filtration devices are made by spinning a thermoplastics polymer through nozzles to produce an intermingling of the filaments issuing from the nozzles forming, after cooling, a lap that can constitute a particle filter. [0003]
  • The prior art processes have the drawback of necessitating the superposition and binding together of a plurality of layers in order to obtain filters that are sufficiently efficient. [0004]
  • The filters obtained in this way have a high specific gravity and a high unit cost. [0005]
  • An aim of the invention is to manufacture a filtration device that is efficient and less dense and more economic than the prior art devices. [0006]
  • The process for manufacturing a filtration device of the aforementioned type in accordance with the invention is characterised in that it comprises an operation of carding fibres having a length in the range 38 mm to 120 mm and a diameter greater than 10 μm to form an isotropic web and in that said web is subjected to a mechanical consolidation operation by means of hydraulic binding consisting in passing very fine water jets at a high pressure through the web disposed on a rotating drum followed by a drying operation. [0007]
  • In accordance with other features of the process in accordance with the invention, separately or in all technically possible combinations: [0008]
  • the carding operation is carried out using a wool type card; [0009]
  • said card incorporates “Dispelmel” type randomising units; [0010]
  • the pressure of the water jets used for the hydraulic binding is in the range 40 bars to 200 bars; [0011]
  • the parameters of the card are chosen to obtain a web having a mass per unit surface area in the range approximately 20 g/m[0012] 2 to approximately 150 g/m2.
  • In accordance with the invention the filtration device of the above type is characterised in that it comprises an isotropic web. [0013]
  • In accordance with other features of the filtration device in accordance with the invention, separately or in all technically possible combinations: [0014]
  • said web is in a single layer; [0015]
  • the length of said fibres is at least equal to 38 mm; [0016]
  • the length of said fibres is at most equal to 120 mm; [0017]
  • the average diameter of said fibres is at least equal to 10 μm; [0018]
  • said fibres are fibres of the same kind or a mixture of different fibres. [0019]
  • said fibres are selected from the group of thermoplastics fibres such as fibres of polypropylene, polyethylene, polyester, polycarbonate, polyamide, the group of acrylic fibres, pre-oxidised acrylic fibres, the group of aramide fibres, the group of phenolic fibres, the group of fluorocarbon fibres, the group of mineral fibres such as glass fibres and the group of metal fibres. [0020]
  • It has been found that the invention provides a filtration device that is efficient and of lower unit cost and of lower specific gravity than the prior art filtration devices. [0021]
  • Another important advantage compared to the prior art is that the head loss when a gas passes through the filtration device is much lower.[0022]
  • Other aspects and advantages of the invention will become apparent in the following description of one embodiment of a filtration device designed to be installed in equipment for heating/air conditioning a motor vehicle. [0023]
  • 1.7 Tex (14 μm diameter) polypropylene fibres are cut to a length of 40 mm and then introduced into a mixer. [0024]
  • The fibre mixture obtained is then carded by means of a two-doffer wool type card equipped with a “Dispelmel” type randomising unit to obtain an isotropic web. [0025]
  • In one variant of the process the web leaving the card is introduced into a condenser to form a single layer lap. [0026]
  • The parameters of the card and/or of the condenser are selected to produce a web or a lap having a mass per unit surface area in the range approximately 20 g/m[0027] 2 to approximately 150 g/m2.
  • The web or lap is deposited onto a belt and then consolidated by a hydraulic binding operation. [0028]
  • The hydraulic binding operation consists in passing very fine water jets at a high pressure (in the range 40 bars to 200 bars) through the web or lap disposed on a rotating drum. [0029]
  • When they bounce off the drum the water jets cause knotting of the fibres imparting a high mechanical strength to the web or lap without significantly increasing its specific gravity. [0030]
  • After drying, the web or lap is mounted on a support to form the filtration device. [0031]
  • Using a 0.84 mm thick web or lap the process has produced a filter having a mass per unit surface area of 66 g/m[0032] 2 and a specific gravity of 0.07.
  • To test the efficiency of a filter obtained in the above manner, it was disposed across a 100 cm[0033] 2 20 cm/s flow of air laden with particles.
  • The particles corresponded to a “fine SAE powder” defined in US Standard SAE J 726/ISO 5011. [0034]
  • The particle concentration was 100 mg/m[0035] 3.
  • The head loss across the filter under the above conditions was only 14 Pa and the efficiency was 80%. [0036]
  • Compared to filtration devices currently on the market, an efficiency comparable to the best of them was obtained with a product having a much lower specific gravity (0.07 compared to 0.12 to 0.30) generating a much lower head loss. [0037]
  • Endurance tests have shown that the efficiency of the filtration device in accordance with the invention is more stable with time. [0038]
  • What is more, the process described hereinabove is carried out continuously and produces the filtration device in a single operation. [0039]

Claims (12)

1. A process for manufacturing a filtration device more particularly intended for filtering gases such as air for ventilating and/or heating and/or conditioning rooms or automobile vehicles, characterised in that it comprises an operation of carding fibres having a length in the range 38 mm to 120 mm and a diameter greater than 10 μm to form an isotropic web and in that said web is subjected to a mechanical consolidation operation by means of hydraulic binding consisting in passing very fine water jets at a high pressure through the web disposed on a rotating drum followed by a drying operation.
2. A process according to
claim 1
characterised in that the carding operation is carried out using a wool type card.
3. A process according to
claim 2
characterised in that said card incorporates “Dispelmel” type randomising units.
4. A process according to any one of
claims 1
to
3
characterised in that the pressure of the water jets is in the range 40 bars to 200 bars.
5. A process according to any one of
claims 1
to
4
characterised in that the parameters of the card are chosen to obtain a web having a mass per unit surface area in the range approximately 20 g/m2 to approximately 150 g/m2.
6. A process according to any one of the preceding claims characterised in that the web is in a single layer.
7. A process according to any one of the preceding claims characterised in that said fibres are fibres of the same kind or a mixture of different fibres.
8. A process according to
claim 7
characterised in that said fibres are selected from the group of thermoplastics fibres such as fibres of polypropylene, polyethylene, polyester, polycarbonate, polyamide, the group of acrylic fibres, pre-oxidised acrylic fibres, the group of aramide fibres, the group of phenolic fibres, the group of fluorocarbon fibres, the group of mineral fibres such as glass fibres and the group of metal fibres.
9. A filtration device for filtering gases such as air for ventilating and/or heating and/or air conditioning rooms or motor vehicles manufactured in particular by the process according to any one of the preceding claims characterised in that it consists of an isotropic web.
10. A filtration device according to
claim 9
characterised in that the web is in a single layer.
11. A filtration device according to
claim 9
or
claim 10
characterised in that the isotropic web is made up of fibres having a length in the range 38 mm to 120 mm and an average diameter at least equal to 10 μm.
12. A filtration device according to
claim 9
or
claim 10
characterised in that the isotropic web is made up of polypropylene fibres having a length in the range 38 mm to 120 mm and an average diameter at least equal to 10 μm.
US09/202,147 1997-04-10 1998-03-27 Filtration device and process for its manufacture Expired - Fee Related US6440192B2 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FR9704524A FR2761901B1 (en) 1997-04-10 1997-04-10 METHOD FOR PRODUCING A FILTERING DEVICE AND FILTERING DEVICE IN PARTICULAR FOR AERATION AND / OR AIR CONDITIONING OF PREMISES OR VEHICLES
FR97/04524 1997-04-10
FR9704524 1997-04-10
PCT/FR1998/000633 WO1998045023A1 (en) 1997-04-10 1998-03-27 Filtration device and process for its manufacture

Publications (2)

Publication Number Publication Date
US20010037540A1 true US20010037540A1 (en) 2001-11-08
US6440192B2 US6440192B2 (en) 2002-08-27

Family

ID=9505839

Family Applications (1)

Application Number Title Priority Date Filing Date
US09/202,147 Expired - Fee Related US6440192B2 (en) 1997-04-10 1998-03-27 Filtration device and process for its manufacture

Country Status (6)

Country Link
US (1) US6440192B2 (en)
EP (1) EP0925101B1 (en)
JP (1) JP2000512900A (en)
DE (1) DE19880664T1 (en)
FR (1) FR2761901B1 (en)
WO (1) WO1998045023A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050233666A1 (en) * 2000-12-13 2005-10-20 N.V. Bekaert S.A. Short metal fibers
US20060277731A1 (en) * 2003-04-08 2006-12-14 Jochen Schreiber Method for stitch-bonding or finishing a material web by means of hidrodynamic needling, and product produced according to this method

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2800993B1 (en) * 1999-11-17 2003-08-15 Valeo METHOD FOR PRODUCING A FILTRATION DEVICE AND FILTRATION DEVICE FOR GAS FILTRATION SUCH AS AIR FOR AERATION AND / OR HEATING AND / OR AIR CONDITIONING OF PREMISES OR MOTOR VEHICLES.
FR2806319B1 (en) * 2000-03-15 2002-10-25 Valeo FILTRATION DEVICE FOR FITTING A VENTILATION AND / OR HEATING AND / OR AIR CONDITIONING APPARATUS, PARTICULARLY FOR A MOTOR VEHICLE
FR2806320B1 (en) * 2000-03-15 2003-02-07 Valeo FILTRATION DEVICE FOR FITTING A VENTILATION AND / OR HEATING AND / OR AIR CONDITIONING APPARATUS, PARTICULARLY FOR A MOTOR VEHICLE
FR2806318B1 (en) * 2000-03-15 2002-10-25 Valeo FILTRATION DEVICE FOR FITTING A VENTILATION AND / OR HEATING AND / OR AIR CONDITIONING APPARATUS, IN PARTICULAR FOR A MOTOR VEHICLE
DE10053233A1 (en) * 2000-10-26 2002-05-16 Tesa Ag Use of a roughened textile fabric as pollen protection for windows and doors
US6946013B2 (en) * 2002-10-28 2005-09-20 Geo2 Technologies, Inc. Ceramic exhaust filter
FR2875714B1 (en) * 2004-09-29 2006-11-24 Valeo Materiaux De Friction Sa FILTERING MEDIA FOR GAS FILTRATION, FILTRATION DEVICE AND METHOD FOR MANUFACTURING THE FILTER MEDIA
US8021457B2 (en) 2004-11-05 2011-09-20 Donaldson Company, Inc. Filter media and structure
US8057567B2 (en) 2004-11-05 2011-11-15 Donaldson Company, Inc. Filter medium and breather filter structure
CA2586636C (en) 2004-11-05 2013-10-01 Donaldson Company, Inc. Filter medium and structure
EA011777B1 (en) 2005-02-04 2009-06-30 Дональдсон Компани, Инк. A filter and a system of crankcase ventilation
CN101163534A (en) 2005-02-22 2008-04-16 唐纳森公司 Aerosol separator
US7682577B2 (en) 2005-11-07 2010-03-23 Geo2 Technologies, Inc. Catalytic exhaust device for simplified installation or replacement
US7682578B2 (en) 2005-11-07 2010-03-23 Geo2 Technologies, Inc. Device for catalytically reducing exhaust
US7722828B2 (en) 2005-12-30 2010-05-25 Geo2 Technologies, Inc. Catalytic fibrous exhaust system and method for catalyzing an exhaust gas
CN101652168A (en) 2007-02-22 2010-02-17 唐纳森公司 Filter element and method thereof
WO2008103821A2 (en) 2007-02-23 2008-08-28 Donaldson Company, Inc. Formed filter element
US8267681B2 (en) 2009-01-28 2012-09-18 Donaldson Company, Inc. Method and apparatus for forming a fibrous media
JP2022098027A (en) 2020-12-21 2022-07-01 キヤノン電子管デバイス株式会社 X-ray tube

Family Cites Families (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2862251A (en) * 1955-04-12 1958-12-02 Chicopee Mfg Corp Method of and apparatus for producing nonwoven product
CH509450A (en) * 1965-07-29 1971-06-30 Snia Viscosa Non-woven fabric prodn
US3563241A (en) * 1968-11-14 1971-02-16 Du Pont Water-dispersible nonwoven fabric
USRE28680E (en) * 1971-01-05 1976-01-13 Johnson & Johnson Apertured nonwoven fabrics and methods of making the same
US4375718A (en) * 1981-03-12 1983-03-08 Surgikos, Inc. Method of making fibrous electrets
US4361619A (en) * 1981-05-20 1982-11-30 E. I. Du Pont De Nemours And Company Filter of poly(tetrafluoroethylene) and glass fibers
US4548628A (en) * 1982-04-26 1985-10-22 Asahi Kasei Kogyo Kabushiki Kaisha Filter medium and process for preparing same
DE3346335A1 (en) * 1983-12-22 1985-07-18 Hergeth Hollingsworth GmbH, 4408 Dülmen METHOD AND DEVICE FOR PRODUCING A UNIFORM FIBER MATING IN THE FABRICATION ZONE BETWEEN TAMBOUR AND FIBER TAKEOVER ORGAN
DE3346327A1 (en) * 1983-12-22 1985-07-18 Hergeth Hollingsworth GmbH, 4408 Dülmen METHOD AND DEVICE FOR THE PRODUCTION OF A FLUSHED FIBER MESH FROM MESH
US4612237A (en) * 1985-12-13 1986-09-16 E. I. Du Pont De Nemours And Company Hydraulically entangled PTFE/glass filter felt
US4874399A (en) * 1988-01-25 1989-10-17 Minnesota Mining And Manufacturing Company Electret filter made of fibers containing polypropylene and poly(4-methyl-1-pentene)
JP2975396B2 (en) * 1990-05-22 1999-11-10 ダイニック株式会社 Air filter material
FR2667622B1 (en) * 1990-10-08 1994-10-07 Kaysersberg Sa HYDRAULICALLY LINKED MONTISSE AND MANUFACTURING METHOD THEREOF.
EP0669849B1 (en) * 1992-11-23 1996-12-27 W.L. Gore & Associates, Inc. Triboelectric filtration material
DE69305096T2 (en) * 1993-01-07 1997-04-30 Minnesota Mining & Mfg FLEXIBLE NON-WOVEN
FR2717802B1 (en) 1994-03-25 1996-06-21 Sanofi Sa New aromatic compounds, process for their preparation and pharmaceutical compositions containing them.
FR2717820B1 (en) * 1994-03-25 1996-05-15 Valeo Friction material intended to equip a device implementing friction in a liquid medium, as well as the process for producing such a friction material and the device which is equipped with it.
US5422159A (en) * 1994-12-08 1995-06-06 Ausimont U.S.A., Inc. Fluorpolymer sheets formed from hydroentangled fibers
US5770532A (en) * 1996-01-11 1998-06-23 Hitachi, Ltd. Method for manufacturing a solidified fiber fleece, the resulting solidified fiber fleece, and use of this fleece
US5970583A (en) * 1997-06-17 1999-10-26 Firma Carl Freudenberg Nonwoven lap formed of very fine continuous filaments

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050233666A1 (en) * 2000-12-13 2005-10-20 N.V. Bekaert S.A. Short metal fibers
US20060277731A1 (en) * 2003-04-08 2006-12-14 Jochen Schreiber Method for stitch-bonding or finishing a material web by means of hidrodynamic needling, and product produced according to this method

Also Published As

Publication number Publication date
WO1998045023A1 (en) 1998-10-15
JP2000512900A (en) 2000-10-03
EP0925101B1 (en) 2004-04-21
EP0925101A1 (en) 1999-06-30
US6440192B2 (en) 2002-08-27
FR2761901A1 (en) 1998-10-16
DE19880664T1 (en) 1999-05-12
FR2761901B1 (en) 1999-05-14

Similar Documents

Publication Publication Date Title
US6440192B2 (en) Filtration device and process for its manufacture
EP0084711B1 (en) Filter
CN1318512C (en) Filtration arrangement utilizing pleated construction and method
US5486410A (en) Fibrous structures containing immobilized particulate matter
US6423123B1 (en) Filtering material for fluidic media and a method and device for producing such a filtering material
US5496627A (en) Composite fibrous filters
US6200368B1 (en) Combined filter device for filtering out particles and gases
EP1341653B1 (en) Method and apparatus for producing high efficiency fibrous media and web media formed thereby
JP5654356B2 (en) Composite nonwoven web and method for making and using the same
CN100503717C (en) Polymer, polymer microfiber, polymer nanofiber and applications including filter structures
JPH03185169A (en) Web containing stable fiber and its manufacture
JPH05337403A (en) Filter system
WO1997023267A1 (en) Laminate filter media
CN1656038A (en) Filtering medium comprising mineral fibres obtained by means of centrifugation
US20030045192A1 (en) Rigidified nonwoven and method of producing same
US20160051917A1 (en) Fibrous nonwoven and method for the production thereof
WO1991014503A1 (en) Filter
CN112912157A (en) Filter medium for fluid filtration, method for producing a filter medium, and fluid filter
AU2698099A (en) Filter medium
GB2325181A (en) Self-supporting pleated filter composite
GB2305618A (en) A glass fibre filter composite and method of making it
JP3653395B2 (en) Air cleaner filter media
US5112369A (en) Method of applying a wettant to a filtering media
US11795593B2 (en) Filter medium, filter element and use thereof and filter arrangement
JP4117649B2 (en) Filter material for removing coarse dust, method for producing the same, and filter unit

Legal Events

Date Code Title Description
AS Assignment

Owner name: VALEO, FRANCE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:GUERIN, RICHARD;LEGRAND, CLAUDE;REEL/FRAME:010064/0838

Effective date: 19981109

AS Assignment

Owner name: VALCO, FRANCE

Free format text: CORRECTIVE ASSIGNMENT TO CORRECT THE ADDRESS OF THE ASSIGNEE. FILED ON 12/09/1998, RECORDED ON REEL 010064 FRAME 0838;ASSIGNORS:GUERIN, RICHARD;LEGRAND, CLAUDE;REEL/FRAME:012859/0891

Effective date: 19981109

FPAY Fee payment

Year of fee payment: 4

REMI Maintenance fee reminder mailed
LAPS Lapse for failure to pay maintenance fees
STCH Information on status: patent discontinuation

Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362

FP Lapsed due to failure to pay maintenance fee

Effective date: 20100827