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AU744413B2 - Filter medium - Google Patents
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AU744413B2 - Filter medium - Google Patents

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Publication number
AU744413B2
AU744413B2 AU26980/99A AU2698099A AU744413B2 AU 744413 B2 AU744413 B2 AU 744413B2 AU 26980/99 A AU26980/99 A AU 26980/99A AU 2698099 A AU2698099 A AU 2698099A AU 744413 B2 AU744413 B2 AU 744413B2
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AU
Australia
Prior art keywords
filter medium
staple fibres
filter
medium according
fibres
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.)
Ceased
Application number
AU26980/99A
Other versions
AU2698099A (en
Inventor
Eugen Gutsche
Michael Gutsche
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.)
MGF Gutsche GmbH and Co KG
Original Assignee
MGF Gutsche GmbH and Co 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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=7867061&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=AU744413(B2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by MGF Gutsche GmbH and Co KG filed Critical MGF Gutsche GmbH and Co KG
Publication of AU2698099A publication Critical patent/AU2698099A/en
Application granted granted Critical
Publication of AU744413B2 publication Critical patent/AU744413B2/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H13/00—Other non-woven fabrics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/08—Filter cloth, i.e. woven, knitted or interlaced material
    • B01D39/086—Filter cloth, i.e. woven, knitted or interlaced material of inorganic 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
    • B01D39/20—Other self-supporting filtering material ; Other filtering material of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
    • B01D39/2003—Glass or glassy material
    • B01D39/2017—Glass or glassy material the material being filamentary or fibrous
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
    • D03D15/20—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the material of the fibres or filaments constituting the yarns or threads
    • D03D15/242—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the material of the fibres or filaments constituting the yarns or threads inorganic, e.g. basalt
    • D03D15/267—Glass
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4282—Addition polymers
    • D04H1/43—Acrylonitrile series
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4282—Addition polymers
    • D04H1/4318—Fluorine series
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4326—Condensation or reaction polymers
    • D04H1/4334—Polyamides
    • D04H1/4342—Aromatic polyamides
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/44—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling
    • D04H1/46—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres
    • D04H1/48—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres in combination with at least one other method of consolidation
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/44—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling
    • D04H1/46—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres
    • D04H1/48—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres in combination with at least one other method of consolidation
    • D04H1/482—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres in combination with at least one other method of consolidation in combination with shrinkage
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H5/00—Non woven fabrics formed of mixtures of relatively short fibres and yarns or like filamentary material of substantial length
    • D04H5/02—Non woven fabrics formed of mixtures of relatively short fibres and yarns or like filamentary material of substantial length strengthened or consolidated by mechanical methods, e.g. needling
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H5/00—Non woven fabrics formed of mixtures of relatively short fibres and yarns or like filamentary material of substantial length
    • D04H5/12—Glass 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
    • B01D2239/0604—Arrangement of the fibres in the filtering material
    • B01D2239/0622—Melt-blown
    • 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
    • B01D2239/0604—Arrangement of the fibres in the filtering material
    • B01D2239/0627—Spun-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
    • B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
    • B01D2239/065—More than one layer present in the filtering material
    • 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
    • B01D2239/0659—The layers being joined by needling
    • 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
    • B01D2239/0686—More than one layer present in the filtering material by spot-gluing
    • 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
    • B01D2239/069—Special geometry of layers
    • 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
    • B01D2239/12—Special parameters characterising the filtering material
    • B01D2239/1233—Fibre diameter
    • 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
    • B01D2239/12—Special parameters characterising the filtering material
    • B01D2239/1291—Other parameters

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Filtering Materials (AREA)
  • Nonwoven Fabrics (AREA)
  • Glass Compositions (AREA)
  • Filters For Electric Vacuum Cleaners (AREA)

Abstract

PROBLEM TO BE SOLVED: To lessen a risk in sewing together a filter medium as far as possible. SOLUTION: A filter medium is composed of a filter texture 1 comprising a glass fiber covered by a staple fiber 2. The staple fiber 2 is composed of a polymer which is thermally solidified and chemically stabilized, and is bonded to the filter texture 1. The filter texture 1 is at least 350 g/m<2> in its area weight and at least 0.5 mm in thickness. A fineness of the staple fiber is 0.80 dtex to 8 dtex, and its incision length is at least 20 mm. The staple fiber 2 is equipped with a polymer cover to be fitted after sewing together, and its weight is at most 40% of total weight of the filter medium.

Description

P/00/0011 Regulation 3.2
AUSTRALIA
Patents Act 1990 COMPLETE SPECIFICATION FOR A STANDARD PATENT
S.
St..
V.
*0*V V. V
V
ORIGINAL
Name of Applicant: Actual Inventors: Address for service in Australia: Invention Title: MGF GUTSCHE CO. GmbH-BETRIEBS-KG Eugen GUTSCHE and Michael GUTSCHE CARTER SMITH BEADLE 2 Railway Parade Camberwell Victoria 3124 Australia FILTER MEDIUM The following statement is a full description of this invention, including the best method of performing it known to us 1A FILTER MEDIUM This invention relates to a filter medium with a filter fabric of glass fibres which is covered, by needling, with temperature-stable polymeric staple fibres, the weight of the staple fibres amounting to less than 40% of the total weight of the filter medium.
A filter medium of the above-mentioned type is the subject of DE 196 15 022. The filter medium according to this document differs from previously known filter media mainly in that not only do the glass fibres function as a supporting fabric but also, due to the density of the fabric they form, they perform a filtration function. Furthermore, the staple fibres serve to prevent transverse breakage of the filter medium, because the staple fibres prevent the glass fibres from being bent to tight radii of curvature.
A filler medium with a supporting fabric of glass fibres which is covered with about 15 weight-percent of PTFE staple fibres is described, for example, in FR 2 584 942. The glass fibre fabric according to this document has a weight per unit-area of up to 350 g/m 2 and, due to its mesh width, Is incapable of performing any filtering function.
Filter media are often subjected to great mechanical stress. This is, for example,.the case with bag filters, when they are being cleaned by pulsed blasting with compressed air. With the filter medium known in the art, it has been found that, under unfavourable conditions, the compressed-air blasts cause deneedling in individual areas, causing loss of protection against transverse breakage. On account of the low proportion of staple fibres used, this danger is especially great, because there is therefore only a small degree of mutual binding of the staple fibres and, due to their smooth surface, they are only poorly anchored in the glass fibre fabric.
It is therefore desirable to further develop a filter medium of the kind described above so that, even under great mechanical stress, the danger of deneedling is as low as possible.
According to the present invention there is provided a filter medium comprising a filter fabric of glass fibres covered, by needling, with temperature-stable polymeric staple fibres, the proportion by weight of the staple fibres being less than 40% of the total weight of the filter medium, wherein the filter fabric has a weight per unit-area of over 350 g/m 2 and a thickness of at least 0.5 mm, the staple fibres have a titre of from 0.80 dtex to 8 dtex and a cut length of at least 20 mm, and the staple fibres have a rougher surface than does PTFE.
JRG:TMP:#31192.SPE 6 May 1999 1 2 In such a filter medium, the danger of deneedling due to high mechanical stress is reliably prevented by a plurality of features that complement one another. Since the staple fibres have a very small diameter and a length of at least 20 mm, the individual staple fibres, despite the small mesh width of the filter fabric, are able to pass through s the glass fibre filter fabric a number of times during needling, and thereby become well anchored therein. The rough surface of the staple fibres additionally increases their hold in the glass fibre fabric by providing good anchorage of the staple fibres.
Despite the low coverage with the staple fibres, transverse breakage is reliably prevented in the filter fabric according to the invention, because no deneedling can to occur and therefore the minimum number of transverse staple fibres essential to the prevention of transverse breakage is always maintained.
The filter medium according to the invention can be used in bag filtration equipment cleaned by the pulsed compressed air method without the spaces between the wires of the supporting baskets onto which the filter tubes are drawn having to be reduced to is the extent necessary for purely glass fabrics. Nor is it necessary to integrate so many longitudinal wires into the supporting baskets; therefore, through the use of the filter medium of the invention for filtration equipment that is cleaned by pulsed compressed air, cost savings on the supporting baskets are possible.
Since glass fibres are very much finer than any conventional synthetic polymer (averaging between 0.1 and 0.3 tm) and the glass fibre fabric already has a high weight per unit area, the result in combination with the polymer is a filter material which has a high separating power and which at the same time constitutes an improvement on the known, poor transverse breakage resistance of purely glass materials.
It is possible to use, as staple fibres, polymers that come from the supplier with a very smooth surface, if, according to a development of the invention, the rough surface of the staple fibres is produced by a polymer coating applied after the needling.
The staple fibres are especially securely bound to the filter fabric if, according to another development of the invention, the staple fibres are shrunk, after needling, by a heat treatment at temperatures above 150°C. This shrinkage procedure causes the staple fibres to entangle themselves very strongly with the filter fabric and at the same time with one another.
The coating can be produced particularly economically if it consists of a PTFE with an inorganic filler. Particularly suitable as fillers are powders with a large surface area.
Synthetic silica has proven to be an especially effective inorganic filler.
The filter medium has especially good resistance to high temperatures and to intense chemical attack if, according to a further development of the invention, the staple fibres consist of PTFE and have a titre of not more than 3.5 dtex.
The filtration properties of the filter medium and its cost/benefit ratio can be further improved if, according to a further development of the invention, the needled-on, temperature-stable, polymeric staple fibres consist of a polyimide, polyacrylonitrile, polyphylene sulfide or an aramid.
To further clarify the invention, reference will now be made to the drawing, which shows a diagrammatic cross-section through a filter medium according to the invention.
15s The filter medium represented has a filter fabric I made of glass fibres woven together, which amounts to 70 to 85% of the total weight of the filter medium, and which is, for example, 0.9 mm deep. The filter fabric I is able by itself to perform filtration, for it has sufficient longitudinal strength, due to its thickness, so that a conventional supporting fabric is unnecessary. The filter fabric I is covered with a small proportion of staple fibres 2 so that the filter medium is given, for example, a thickness of 1.4 mm. If an attempt is made to crease the filter medium, these polymeric, needled-in staple fibres 2 prevent any tight radii of curvature in the glass fibres forming the filter fabric and thus prevent transverse breakage.
The filter fabric 1 is woven so tightly that it has a weight per unit-area of over 350 g/m 2 and a thickness of at least 0.5 mm. The glass fibres have a titre of not more than 0.80 dtex to 8 dtex and a cut length of at least 20 mm. After needling, the filter medium is subjected to a heat treatment above 150°C so that the staple fibres can shrink and thus bind to one another and anchor themselves in the filter fabric 1. In addition, after being needled with PTFE staple fibres, the filter medium is preferably provided with a coating, in a bath, which gives the PTFE staple fibres a rough surface.

Claims (8)

1. A filter medium comprising a filter fabric of glass fibres covered, by needling, with temperature-stable polymeric staple fibres, the proportion by weight of the staple fibres being less than 40% of the total weight of the filter medium, wherein the filter fabric has a weight per unit-area of over 350 g/m 2 and a thickness of at least 0.5 mm, the staple fibres have a titre of from 0.80 dtex to 8 dtex and a cut length of at least 20 mm, and the staple fibres have a rougher surface than does PTFE.
2. A filter medium according to claim 1, wherein the rough surface of the staple fibres is produced by a polymer coating applied after the needling.
3. A filter medium according to claim 1, wherein the staple fibres are shrunk, after needling, by a heat treatment using temperatures above 150 0 C.
4. A filter medium according to at least one of the above claims, wherein the coating consists of a PTFE with an inorganic filler.
5. A filter medium according to claim 4, wherein the inorganic filler is synthetic silica.
6. A filter medium according to claim 1, wherein the staple fibres consist of PTFE and have a titre of not more than 3.5 dtex.
7. A filler medium according to claim 1 or claim 2, wherein the staple fibres consist of a polyamide, polyphylene sulfide, polyacrylonitrile or an aramid.
8. A filter medium substantially as described herein with reference to the accompanying drawing. DATED: 6 May 1999 CARTER SMITH BEADLE Patent Attorneys for the Applicant: MGF GUTSCHE CO. GmbH-BERTRIEBS-KG JRG:TMP:#31192.SPE 6 May 1999
AU26980/99A 1998-05-08 1999-05-06 Filter medium Ceased AU744413B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19820560 1998-05-08
DE19820560A DE19820560A1 (en) 1998-05-08 1998-05-08 Filter material of woven glass fibers

Publications (2)

Publication Number Publication Date
AU2698099A AU2698099A (en) 1999-11-18
AU744413B2 true AU744413B2 (en) 2002-02-21

Family

ID=7867061

Family Applications (1)

Application Number Title Priority Date Filing Date
AU26980/99A Ceased AU744413B2 (en) 1998-05-08 1999-05-06 Filter medium

Country Status (6)

Country Link
EP (1) EP0962243B1 (en)
JP (1) JP3763996B2 (en)
KR (1) KR100679485B1 (en)
AT (1) ATE278449T1 (en)
AU (1) AU744413B2 (en)
DE (2) DE19820560A1 (en)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20010000838A (en) * 2000-10-23 2001-01-05 황우현 Coating technology to improve the thermal resistance of synthetic fiber bag filter
JP4800643B2 (en) * 2005-03-16 2011-10-26 ダイワボウホールディングス株式会社 Cylindrical filter and manufacturing method thereof
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JP3763996B2 (en) 2006-04-05
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DE19820560A1 (en) 1999-11-11
EP0962243B1 (en) 2004-10-06
DE59910690D1 (en) 2004-11-11
ATE278449T1 (en) 2004-10-15
EP0962243A1 (en) 1999-12-08
AU2698099A (en) 1999-11-18
JPH11333224A (en) 1999-12-07

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