WO2007014602A2 - Element filtre et dispositif associe - Google Patents

Element filtre et dispositif associe Download PDF

Info

Publication number
WO2007014602A2
WO2007014602A2 PCT/EP2006/006172 EP2006006172W WO2007014602A2 WO 2007014602 A2 WO2007014602 A2 WO 2007014602A2 EP 2006006172 W EP2006006172 W EP 2006006172W WO 2007014602 A2 WO2007014602 A2 WO 2007014602A2
Authority
WO
WIPO (PCT)
Prior art keywords
filter element
fibers
element according
nonwoven fabric
filter
Prior art date
Application number
PCT/EP2006/006172
Other languages
German (de)
English (en)
Other versions
WO2007014602A3 (fr
Inventor
Peter Pfeuffer
Klaus Veeser
Original Assignee
Carl Freudenberg Kg
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 Carl Freudenberg Kg filed Critical Carl Freudenberg Kg
Publication of WO2007014602A2 publication Critical patent/WO2007014602A2/fr
Publication of WO2007014602A3 publication Critical patent/WO2007014602A3/fr

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
    • B01D46/523—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material using folded, pleated material with means for maintaining spacing between the pleats or folds
    • 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
    • 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
    • B01D46/10—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces
    • 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
    • B01D46/10—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces
    • B01D46/12—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces in multiple arrangements
    • B01D46/121—V-type arrangements

Definitions

  • the invention relates to a filter element comprising a nonwoven fabric body, which comprises first fibers, wherein the nonwoven fabric body stabilizing agents are assigned.
  • the invention further relates to an arrangement of such filter elements.
  • Filter elements of the type mentioned are already known from the prior art.
  • Stabilizing agents in the form of a grout are assigned to a nonwoven fabric in these processes. This gives the filter element a high stability and rigidity.
  • the known filter element is not satisfactorily equipped with regard to its separation performance against fine dusts or particles which have a very small extent.
  • the generic filter elements are insufficiently designed with regard to their regenerability. It is particularly problematic that a filter element, which is a long time in use, contamination which make a regenerability of the nonwoven material impossible. The consequences of this are a shortening of the life of the filter elements and a greatly reduced filter performance.
  • the invention is therefore based on the object of specifying a filter system which ensures effective filtering of fine particles with a long service life.
  • a filter element of the type mentioned is characterized in that the nonwoven fabric body second fibers are associated, which have smaller equivalent diameter than the first fibers.
  • a fiber fraction of first fibers which act as matrix fibers, can easily be provided with a stabilizing agent in order to impart a particular rigidity to a filter element.
  • a stabilizing agent in order to impart a particular rigidity to a filter element.
  • the stiffness of the filter element ensures that it is not subjected to severe deformation during inflow operations by fluids to be filtered, whereby its service life is greatly increased.
  • second fibers could be applied to the nonwoven fabric body at least in regions as a coating.
  • This specific embodiment is advantageous for use of the filter element in surface filtration because a fluid to be filtered can first be filtered by the matrix fibers, namely the first fibers, and then the fine particles remaining in the fluid are deposited on the surface of the filter element by the second fibers can be.
  • the coating could act as a membrane. It is conceivable that the membrane is associated upstream of the nonwoven fabric body. As a result, the finest particles are immediately separated from a fluid to be filtered.
  • the matrix fibers could include activated carbon fibers, so that after deposition of fines, unpleasant odors can be additionally absorbed from a fluid.
  • the second fibers could be incorporated within the nonwoven body. With this configuration, a homogeneous distribution of the second fibers within the matrix fibers is possible. It is conceivable that the concentration of the second fibers and the concentration of the first fibers within the nonwoven fabric body is constant in all spatial directions. This concrete design allows a trouble-free production of
  • Nonwoven fabric body and a uniform elasticity and stability In the deformation of the nonwoven fabric body damage in the extent due to material weaknesses are almost impossible.
  • the nonwoven fabric body exhibits a progressive structure, namely that the concentration of the second fibers within the nonwoven fabric body can be described by a gradient.
  • the concentration of the second fibers continuously increases or decreases in at least one spatial direction.
  • These embodiments of the filter element are advantageous for use in depth or storage filtration. In these filtration processes, it is important that a fluid to be filtered flows through the filter element and is evenly filtered in all areas within the nonwoven fabric body as far as possible. In a progressive structure, defined areas are defined in which the fluid to be filtered is filtered particularly effectively depending on the particle sizes to be separated.
  • the second fibers could have equivalent diameters of at most one micron. Although both the matrix fibers, namely the first fibers and the second fibers, are subject to a distribution, the first fibers have equivalent diameters between 5 and 50 microns and the second fibers equivalent diameters which are at most 1 micron or significantly less. In that regard, the equivalent diameters between the first and second fibers differ significantly. This ensures that the first fibers perform a completely different filtering function than the second fibers. By dimensioning the second fibers, even the finest particles, which are significantly smaller than 1 ⁇ m, can be successfully deposited. The second fibers could be made against this background by electrospinning or melt-blown processes. By electrospinning even fibers can be made in the nanometer range, so that particles with this dimensioning can be effectively deposited.
  • the nonwoven body could be associated with a coating of polytetrafluoroethylene.
  • a coating of polytetrafluoroethylene gives the filter element an anti-adhesive property, which facilitates the regeneration of the filter element and thus effectively prevents an impairment of its filter performance.
  • a coating is produced by stretching a polytetrafluoroethylene film, which is guided according to a defined Stretching process is connected to the filter element. The stretching process involves stretching the film so that cracking centers are formed on the film in which the material structure of the film is selectively weakened.
  • the first and second fibers could comprise synthetic fibers, respectively, and the first and second fibers could be configured as synthetic fibers.
  • This specific embodiment allows a chemically resistant design of the nonwoven fabric body. With such a nonwoven fabric body, aggressive solvents or aggressive gases can be filtered without problem over a long period of time.
  • the first and / or the second fibers could comprise fibers of a thermoplastic material. It is conceivable that the fibers are made of polypropylene or polyester. The use of thermoplastics is advantageous, since the material properties of these substances are well known and insofar an almost error-free production is possible.
  • the second fibers could consist of polymers that are particularly suitable for an electrostatic spinning process or a melt-blown process.
  • the polymers could include polyamide or polycarbonate.
  • the stabilizing agents could comprise at least one stabilizing structure.
  • a stabilizing structure is advantageous because it may be directly associated with the nonwoven body. It is to be understood in this respect as an intrinsic and integral formation of a stabilizing agent, which can not be separated from the nonwoven body. This makes it possible to one Nonwoven fabric body to give a special rigidity, which prevents deformation of the nonwoven fabric body during Anström perspectivesen. By preventing deformation processes, it is ensured that the entire filter surface is available for the filtration process and not parts of the surface become ineffective due to their mutual contact.
  • the stabilizing structure could be formed as a grove with mountains and valleys. Such a stabilizing structure can be applied by two counter-rotating rollers, which have elevations and depressions which correspond to one another. Grooving with mountains and valleys also increases the effective filter area of a filter element.
  • the stabilizing structure could be formed as an embossing.
  • embossing is meant the application of a structure to the nonwoven body. It is conceivable that punctual impressions, linear impressions,
  • embossing can be done during a calendering process or by thermal processes. Any embossing gives the nonwoven body a flexural rigidity, thereby increasing its life.
  • the stabilizing structure could also be designed as a curvature. It is conceivable that the nonwoven body as a whole has a twist or twist, which gives it a special flexural rigidity. An already pre-curved element is particularly resistant to bending or deformation, contrary to its curvature.
  • the nonwoven body could have a thickness between 0.2 and 5 mm. The choice of this thickness range advantageously allows a sufficient deformability of the filter element with satisfactory filter performance.
  • the stabilizing means could comprise at least one connecting element. Against this background, it is conceivable that the nonwoven body is associated with separate elements such as strips, wires or cords, which are mechanically, chemically or thermally bonded to the nonwoven body in any way. It is conceivable against this background that the
  • connection elements are welded or glued to the nonwoven fabric body. Due to their inherent rigidity or in interaction with the nonwoven fabric body, the connection elements can give the filter element overall a high flexural rigidity.
  • connection means could be designed as a strand.
  • the strand could extend over the filter surface of the nonwoven body.
  • the provision of a strand allows stabilization of the entire filter surface.
  • a folded nonwoven fabric body is provided with one or more strands, which extend over the
  • Wrinkles and fold valleys extend.
  • This concrete configuration not only allows a stabilization of a folded structure but also a secure spacing of the individual pleat tips or pleated skirts. This ensures that a high effective filter surface is ensured even with strong incoming flows and differential pressures.
  • a strand is arranged both on the inflow and outflow side or both raw and clean gas side on the nonwoven fabric body.
  • This embodiment realizes a particularly high stability of the nonwoven fabric body. It is conceivable that two strands are arranged opposite one another on both sides of the nonwoven fabric body. It is advantageous that the strands can penetrate the material of the nonwoven fabric body and form a composite with each other.
  • the strand or strands could be made of a thermoplastic adhesive.
  • a thermoplastic adhesive allows easy processing.
  • the adhesive is applied continuously by spraying onto the nonwoven fabric body.
  • the adhesive after hardening has an elasticity which allows the nonwoven body to be deformed without the strand being damaged, in particular having crack sites.
  • the nonwoven body could be folded.
  • a pleat structure increases the effective filter area of a filter element.
  • a folded nonwoven body can be provided with connecting elements on both the pleat back and on the pleated end faces in order to increase its bending stiffness and to keep the pleat spacing constant. As a result, a gluing of the wrinkles and thus a reduction of the effective filter surface is prevented.
  • the filter element could be designed as a flat filter.
  • Flat filters are used in particular as air filters.
  • Flat filters are characterized by a low elevation but strong areal expansion, so that large areas can be effectively equipped with a filter medium.
  • the nonwoven body of the flat filter could have first folds and second folds, the second folds having larger flanks than the first folds.
  • Flanks are the areas forming the second folds. This embodiment realizes a double-folded filter element with maximized filter area.
  • the filter element could be designed as a star filter.
  • Star filters find particular use as air or oil filters.
  • the design as an oil filter allows the realization of a particularly large effective filter area in a confined space.
  • filter elements are operatively connected to one another with angle formation. To avoid repetition in relation to the inventive step, reference is made to the comments on the filter element as such.
  • the filter elements could be W-shaped.
  • a plurality of filter elements are connected to one another at their edges in a material, positive or non-positive manner.
  • the connection can be made by a thermal process or an adhesive process.
  • a plurality of flat filters could be positioned in a zigzag arrangement with their filter surfaces forming angles to one another. This concrete embodiment realizes a maximum effective filter area in a confined space, namely by positioning already folded filter elements again in a fold-forming arrangement.
  • Fig. 1 shows a flat filter with a fold structure, which two
  • Fig. 1 shows a filter element comprising a nonwoven fabric body 1 with first fibers 2 having an equivalent diameter of 5 to 50 microns.
  • Stabilizing agent 3 is assigned to nonwoven fabric body 1 for stabilization.
  • the nonwoven fabric body 1 further comprises second fibers 4 having smaller equivalent diameters than the first fibers 2.
  • the equivalent diameters of the fibers 4 are at most 1 micron or are significantly smaller than 1 micron. Equivalent diameter means the diameter that a fiber of any cross-sectional shape would have if its cross-sectional shape were circular for the same area.
  • the second fibers 4 are applied to the nonwoven fabric body 1 as a coating.
  • the stabilizing agents 3 comprise a stabilizing structure.
  • the stabilizing structure is designed as a grooving with mountains 5 and valleys 6.
  • the nonwoven fabric body 1 is folded and formed as a flat filter.
  • the flat filter further comprises stabilizing means 9, which are formed as strands of a thermoplastic adhesive. Schematically, it is shown in FIG. 1 that two strands 9 of a thermoplastic adhesive extend along the nonwoven fabric body over the fold peaks 10 and fold valleys 11.
  • the strands 9 can be located downstream from further strands.
  • the strands 9 can be connected through the nonwoven fabric body with further strands by deliquescence or flow into each other.
  • the first fibers 2 and the second fibers 4 are configured as synthetic fibers.
  • Fig. 2 shows an arrangement of filter elements, which are designed as flat filters.
  • the filter elements are arranged in a W-shape.
  • the filter elements are connected to each other at their edges 7, wherein their filter surfaces 8 form angles to each other.
  • the filter surfaces 8 form the
  • Each filter surface 8 consists of a nonwoven fabric body having a first pleat structure.
  • FIG. 2 shows an arrangement of filter elements according to FIG. 1. All filter elements of the arrangement from FIG. 2 can have strands 9 extending as a stabilizing agent, which extend along the nonwoven fabric body 1.

Abstract

Elément filtre qui comporte un corps en non-tissé (1) comprenant des premières fibres (2), ledit corps en non-tissé (1) étant associé à des moyens de stabilisation (3). L'objet de la présente invention est la mise au point d'un système de filtre garantissant un filtrage efficace de particules fines, ainsi qu'une longue durée d'utilisation. A cet effet, ledit élément filtre est caractérisé en ce que le corps en non-tissé (1) est associé à des secondes fibres (4) qui possèdent un diamètre équivalent plus petit que les premières fibres (2). La présente invention concerne en outre un système possédant un tel élément filtre.
PCT/EP2006/006172 2005-08-04 2006-06-27 Element filtre et dispositif associe WO2007014602A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005037313.5 2005-08-04
DE102005037313A DE102005037313A1 (de) 2005-08-04 2005-08-04 Filterelement und Anordnung

Publications (2)

Publication Number Publication Date
WO2007014602A2 true WO2007014602A2 (fr) 2007-02-08
WO2007014602A3 WO2007014602A3 (fr) 2007-04-12

Family

ID=36991077

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2006/006172 WO2007014602A2 (fr) 2005-08-04 2006-06-27 Element filtre et dispositif associe

Country Status (2)

Country Link
DE (1) DE102005037313A1 (fr)
WO (1) WO2007014602A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114100272A (zh) * 2020-08-26 2022-03-01 卡尔·弗罗伊登伯格公司 盒式过滤器

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202006018864U1 (de) * 2006-12-12 2008-04-17 Mann + Hummel Gmbh Kombiniertes Filterelement
DE102013207254A1 (de) * 2013-04-22 2014-10-23 Mahle International Gmbh Verfahren und Vorrichtung zum Herstellen von Filterelementen

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29907699U1 (de) * 1999-04-30 1999-08-05 Fibermark Gessner Gmbh & Co Staubfilterbeutel, enthaltend Nanofaservlies
EP0972559A1 (fr) * 1996-12-04 2000-01-19 Daikin Industries, Limited Milieu filtrant et unite de filtre a air utilisant ce milieu
US6165572A (en) * 1995-11-17 2000-12-26 Donaldson Company, Inc. Filter material construction and method
US20030177909A1 (en) * 2002-01-31 2003-09-25 Koslow Evan E. Nanofiber filter media
EP1366791A1 (fr) * 2002-05-28 2003-12-03 Hollingsworth & Vose GmbH & Co. KG Matériau filtrant
US20040255783A1 (en) * 2003-06-19 2004-12-23 Graham Kristine M. Cleanable high efficiency filter media structure and applications for use
EP1504803A1 (fr) * 2003-08-06 2005-02-09 Behr GmbH & Co. KG Filtre à air, notamment pour l' habitacle intérieur d' un véhicule automobile

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4410427A (en) * 1981-11-02 1983-10-18 Donaldson Company, Inc. Fluid filtering device
DD255282A1 (de) * 1986-12-22 1988-03-30 Medizin Labortechnik Veb K Verfahren zur hydrophobierung mikrobakteriendichter luftfiltermaterialien
JPH0414097Y2 (fr) * 1987-05-26 1992-03-31
JPH02207805A (ja) * 1989-02-06 1990-08-17 Toyo Roki Seizo Kk フィルタエレメントおよびフィルタエレメントの製造方法
US5246474A (en) * 1991-05-04 1993-09-21 British United Shoe Machinery Limited Process for manufacturing a self-supporting filter unit
IT1287629B1 (it) * 1996-03-06 1998-08-06 Universal Filter Spa Processo per la fabbricazione di un mezzo filtrante, mezzo cosi' fabbricato, e filtri impieganti detto mezzo
DE10051186B4 (de) * 2000-10-16 2005-04-07 Fibermark Gessner Gmbh & Co. Ohg Staubfilterbeutel mit hochporöser Trägermateriallage
JP3777120B2 (ja) * 2001-12-21 2006-05-24 呉羽テック株式会社 再使用可能なフィルターユニット

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6165572A (en) * 1995-11-17 2000-12-26 Donaldson Company, Inc. Filter material construction and method
EP0972559A1 (fr) * 1996-12-04 2000-01-19 Daikin Industries, Limited Milieu filtrant et unite de filtre a air utilisant ce milieu
DE29907699U1 (de) * 1999-04-30 1999-08-05 Fibermark Gessner Gmbh & Co Staubfilterbeutel, enthaltend Nanofaservlies
US20030177909A1 (en) * 2002-01-31 2003-09-25 Koslow Evan E. Nanofiber filter media
EP1366791A1 (fr) * 2002-05-28 2003-12-03 Hollingsworth & Vose GmbH & Co. KG Matériau filtrant
US20040255783A1 (en) * 2003-06-19 2004-12-23 Graham Kristine M. Cleanable high efficiency filter media structure and applications for use
EP1504803A1 (fr) * 2003-08-06 2005-02-09 Behr GmbH & Co. KG Filtre à air, notamment pour l' habitacle intérieur d' un véhicule automobile

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114100272A (zh) * 2020-08-26 2022-03-01 卡尔·弗罗伊登伯格公司 盒式过滤器
EP3960273A1 (fr) * 2020-08-26 2022-03-02 Carl Freudenberg KG Filtre à cassette pourvu d'élément filtrant à pli spécial
US11745124B2 (en) 2020-08-26 2023-09-05 Carl Freudenberg Kg Cassette filter having a filter element with special folding

Also Published As

Publication number Publication date
WO2007014602A3 (fr) 2007-04-12
DE102005037313A1 (de) 2007-02-15

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