EP1085934B1 - Triboelectric air filter - Google Patents

Triboelectric air filter Download PDF

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Publication number
EP1085934B1
EP1085934B1 EP98921296A EP98921296A EP1085934B1 EP 1085934 B1 EP1085934 B1 EP 1085934B1 EP 98921296 A EP98921296 A EP 98921296A EP 98921296 A EP98921296 A EP 98921296A EP 1085934 B1 EP1085934 B1 EP 1085934B1
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Prior art keywords
filter
fibers
triboelectric
air filter
filters
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Expired - Lifetime
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EP98921296A
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German (de)
French (fr)
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EP1085934A1 (en
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Richard Auger
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Texel Inc
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Texel Inc
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Classifications

    • 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
    • D04H1/4291—Olefin series
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/28—Plant or installations without electricity supply, e.g. using electrets
    • B03C3/30—Plant or installations without electricity supply, e.g. using electrets in which electrostatic charge is generated by passage of the gases, i.e. tribo-electricity
    • 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
    • D04H1/42—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
    • D04H1/4382—Stretched reticular film fibres; Composite fibres; Mixed fibres; Ultrafine fibres; Fibres for artificial leather
    • D04H1/43835—Mixed fibres, e.g. at least two chemically different fibres or fibre blends
    • 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
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/60—Nonwoven fabric [i.e., nonwoven strand or fiber material]
    • Y10T442/637—Including strand or fiber material which is a monofilament composed of two or more polymeric materials in physically distinct relationship [e.g., sheath-core, side-by-side, islands-in-sea, fibrils-in-matrix, etc.] or composed of physical blend of chemically different polymeric materials or a physical blend of a polymeric material and a filler material

Abstract

The invention concerns a triboelectric air filter comprising polypropylene fibres (1) mixed with isophthalamide polymetaphenylene fibres (2). Preferably, the fibre (1) fibre (2) ratio ranges between 5:95 and 50:50, and more preferably between 10:90 and 30:70. Said air filter surface mass which is in the form of a nonwoven, preferably ranges between 15 and 500 g/m2. Said filter is highly efficient and is designed to be used in all appliances wherein air filtering is required.

Description

Domaine technique de l'inventionTechnical field of the invention

La présente invention a pour objet un nouveau filtre à air triboélectrique.The present invention relates to a new air filter triboelectric.

Arrière-plan technologiqueTechnological background

Il est connu que les filtres à air qui sont utilisés dans les appareils où une filtration de l'air est requise, sont beaucoup plus efficaces si la matière qui les constitue contient des charges électriques.It is known that air filters that are used in appliances where air filtration is required, are much more effective if the material which constitutes them contains electric charges.

De tels filtres à air, ci-après appelés "filtres électrostatiques", sont en effet capables de capter un plus grande nombre de poussières que les filtres classiques qui ne possèdent pas de charges électriques. Cette différence s'explique par le fait que des forces attractives s'exercent entre la matière du filtre et les poussières qui, de façon naturelle, contiennent elles aussi des charges électriques.Such air filters, hereinafter called "electrostatic filters", are indeed capable of capturing a greater number of dusts than filters classics that do not have electrical charges. This difference is explained by the fact that attractive forces are exerted between the matter of filter and the dust which naturally also contains electrical charges.

Il existe actuellement trois méthodes qui permettent d'obtenir de tels filtres électrostatiques.There are currently three methods of obtaining such electrostatic filters.

La première de celles-ci consiste à produire un déséquilibre permanent, au niveau moléculaire, entre les charges électriques d'une matière donnée. Le produit obtenu avec cette méthode est habituellement désigné sous le nom d'"électret".The first of these is to produce an imbalance permanent, at the molecular level, between the electrical charges of a material given. The product obtained with this method is usually referred to as the name "electret".

La deuxième méthode consiste à implanter des ions, normalement par un bombardement, dans la matière constituant le filtre.The second method is to implant ions, normally by bombardment, in the material constituting the filter.

La troisième méthode exploite le principe de la triboélectricité, selon lequel des charges électriques apparaissant lorsqu'au moins deux matières différentes sont frottées ensemble. Les produits obtenus par cette troisième méthode sont habituellement désignés sous le nom de "filtres triboélectriques".The third method exploits the principle of triboelectricity, that electrical charges appearing when at least two different materials are rubbed together. The products obtained by this third method are usually referred to as "filters triboelectric ".

À titre d'exemple de mise en oeuvre de cette troisième méthode, on peut se référer au brevet anglais n° 2.190.689 délivré en 1989 au nom de National Research Development Corporation, qui décrit un filtre à air triboélectrique constitué d'un mélange de fibres (1) de polyoléfine telles que le polyéthylène, le polypropylène ou les copolymères d'éthylène et de propylène, avec des fibres (2) d'un autre polymère contenant des fonctions hydrocarbone substituées par des atomes d'halogène, tels que le chlore. Dans ce brevet anglais, le rapport en poids des fibres (2) aux fibres (1) est compris entre 70:30 et 20:80, et de préférence entre 60:40 et 30:70.As an example of implementation of this third method, reference may be made to English Patent No. 2,190,689 issued in 1989 in the name of National Research Development Corporation, which describes an air filter triboelectric consisting of a mixture of polyolefin fibers (1) such as polyethylene, polypropylene or copolymers of ethylene and propylene, with fibers (2) of another polymer containing hydrocarbon functions substituted by halogen atoms, such as chlorine. In this patent English, the weight ratio of fibers (2) to fibers (1) is between 70:30 and 20:80, and preferably between 60:40 and 30:70.

À titre d'autres exemples de mise en oeuvre de cette troisième méthode, on peut se référer aussi au brevet américain n° 5.470.485 délivré en 1995 au nom de FIRMA CARL FREUDENBERG, qui décrit un filtre à air triboélectrique constitué d'un mélange de fibres (1) de polyoléfine avec des fibres (2) de polyacrylonitrile. Là encore, le rapport en poids des fibres (2) aux fibres (1) est compris entre 70:30 et 20:80.As other examples of implementation of this third method, reference may also be made to US patent 5,470,485 issued in 1995 on behalf of FIRMA CARL FREUDENBERG, who describes an air filter triboelectric consisting of a mixture of polyolefin fibers (1) with polyacrylonitrile fibers (2). Again, the weight ratio of the fibers (2) to fibers (1) is between 70:30 and 20:80.

Dans tous les cas, plusieurs caractéristiques importantes distinguent les filtres électrostatiques existants les uns des autres. Ces caractéristiques incluent la quantité de charges électriques, l'intensité des champs électrostatiques générés, et la durée de temps de l'existence de ces champs électriques. Pour être efficace, un filtre doit idéalement posséder un nombre élevé de charges qui produisent des champs électrostatiques intenses et ce, pendant un temps au moins égal à la durée de vie du filtre.In any case, several important characteristics distinguish existing electrostatic filters from each other. These characteristics include the amount of electrical charges, the intensity of electrostatic fields generated, and the length of time of the existence of these electric fields. To be effective, a filter should ideally have a high number of charges which produce intense electrostatic fields and this, for a time at least equal to the lifetime of the filter.

Toutes ces caractéristiques dépendent de la méthode utilisée pour produire les charges, du choix et des proportions des matières constituantes du filtre et finalement des conditions d'utilisation du filtre. Les conditions d'utilisation sont, du fait de l'existence d'une méthode standard de mesure de l'efficacité des filtres, implicitement considérées comme constantes. Donc, la distinction s'établit essentiellement au niveau de la méthode de fabrication et du choix des matières constituantes du filtre.All these characteristics depend on the method used to produce the charges, the choice and the proportions of the constituent materials of the filter and finally the conditions of use of the filter. Conditions are due to the existence of a standard method of measuring the effectiveness of filters, implicitly considered to be constant. So the distinction is essentially made at the level of the manufacturing method and the choice of the constituent materials of the filter.

Résumé de l'inventionSummary of the invention

Il a maintenant été découvert que d'excellents filtres à air triboélectriques peuvent être obtenus si l'on utilise un mélange de fibres de polypropylène avec des fibres de polymétaphénylène isophtalamide.It has now been discovered that excellent air filters triboelectric can be obtained if a mixture of fibers of polypropylene with polymetaphenylene isophthalamide fibers.

Il a notamment été découvert que des filtres à air triboélectriques ayant une efficacité comprise entre 90% et 99% peuvent être obtenus avec de tels mélanges, et ce avec des quantités relativement faibles de fibres de polymétaphénylène isophtalamide.In particular, it has been discovered that triboelectric air filters with an efficiency between 90% and 99% can be obtained with such blends with relatively small amounts of fiber polymetaphenylene isophthalamide.

L'identification de ce couple triboélectrique de fibres disponibles commercialement et réunissant simultanément toutes les caractéristiques voulues, n'a pas été évidente à trouver. En fait, c'est suite à l'observation d'anomalies dans les listes de couples triboélectriques publiées que la Demanderesse a entrepris une étude exhaustive qui a mis en évidence que la combinaison des fibres ci-dessus a des propriétés supérieures.The identification of this triboelectric couple of available fibers commercially and simultaneously combining all the characteristics was not easy to find. In fact, it is following the observation anomalies in the lists of triboelectric couples published that the The Applicant has undertaken an exhaustive study which has shown that the combination of the above fibers has superior properties.

L'invention a donc pour objet un filtre à air de type triboélectrique, caractérisé en ce qu'il est essentiellement constitué d'un mélange de fibres de polypropylène avec des fibres de polymétaphénylène isophtalamide.The subject of the invention is therefore an air filter of the triboelectric type, characterized in that it consists essentially of a mixture of fibers of polypropylene with polymetaphenylene isophthalamide fibers.

Description détaillée de l'inventionDetailed description of the invention

Tel que précédemment indiqué, le filtre à air triboélectrique selon l'invention est constitué d'un mélange de fibres (1) de polypropylène avec des fibres (2) de polymétaphénylène isophtalamide.As previously indicated, the triboelectric air filter according to the invention consists of a mixture of polypropylene fibers (1) with fibers (2) of polymetaphenylene isophthalamide.

Ce mélange se présente de préférence sous la forme d'un non-tissé avec un rapport en poids des fibres (2) aux fibres (1) compris entre 5:95 et 50:50 et plus préférentiellement encore entre 10:90 et 30:70. Comme on peut donc le constater, le rapport en poids de fibres (2) aux fibres (1) dans le filtre selon l'invention est très inférieur à ceux proposés dans les deux brevets ci-dessus analysés.This mixture is preferably in the form of a nonwoven with a weight ratio of fibers (2) to fibers (1) of between 5:95 and 50:50 and more preferably still between 10:90 and 30:70. As we can therefore see, the weight ratio of fibers (2) to fibers (1) in the filter according to the invention is much lower than those proposed in the two patents above analyzed.

N'importe quel type de fibres (1) ou (2) peuvent être utilisés. À titre de fibres (2) de polymétaphénylène isophtalamide, on utilisera de préférence celles commercialisées sous les marques de commerce NOMEX®, APYEIL® et TEIJINCONEX®.Any type of fiber (1) or (2) can be used. As fibers (2) of polymetaphenylene isophthalamide, use will preferably be made of those marketed under the trade names NOMEX® , APYEIL® and TEIJINCONEX® .

La masse du filtre, ainsi que sa masse surfacique (en g/m2), sont fonction des propriétés physiques recherchées, telles que la perte de charge et l'efficacité de filtration. Typiquement, la masse surfacique des filtres devrait se situer entre 15 et 500 g/m2.The mass of the filter, as well as its surface mass (in g / m 2 ), are a function of the desired physical properties, such as the pressure drop and the filtration efficiency. Typically, the areal mass of the filters should be between 15 and 500 g / m 2 .

Tel que précédemment indiqué, le filtre à air triboélectrique selon l'invention a une efficacité de filtration de l'ordre de 90% à 99%. Les pertes de charge se situent habituellement entre 0.1 à 2 mm d'eau. Avantageusement, ces caractéristiques sont stables dans le temps.As previously indicated, the triboelectric air filter according to the invention has a filtration efficiency of the order of 90% to 99%. The loss of charge are usually between 0.1 to 2 mm of water. Advantageously, these characteristics are stable over time.

ExemplesExamples

Des essais ont été effectués sur un filtre selon l'invention identifiée ci-après par les symboles F1. À titre de comparaison, des essais analogues ont été effectués sur un filtre de même composition et de même masse surfacique mais modifié par ajout d'un agent antistatique. Ce filtre est identifié par le symbole F2. D'autres essais ont enfin été effectués sur un troisième filtre de même masse surfacique disponible sur le marché. Ce filtre connu est identifié ci-après par le symbole F3. IDENTIFICATION DES FILTRES F1 Filtre selon l'invention sous la forme d'un non-tissé ayant une masse surfacique de 135 g/m2 et un rapport en poids fibres (2) aux fibres (1) égal à 10:90. Les fibres (2) avaient un titre de 1.5 deniers; les fibres (1) avaient un titre de 3 deniers F2 Filtre identique à F1 avec, en outre, un agent anti-statique pour inhiber les charges électriques. F3 Filtre de masse surfacique égale à 135 g/m2, disponible sur le marché et produit par un procédé triboélectrique tel que décrit dans le brevet US 5 470 485. Tests were carried out on a filter according to the invention identified below by the symbols F1. By way of comparison, similar tests were carried out on a filter of the same composition and of the same areal mass but modified by the addition of an antistatic agent. This filter is identified by the symbol F2. Other tests were finally carried out on a third filter of the same areal mass available on the market. This known filter is identified below by the symbol F3. IDENTIFICATION OF FILTERS F1 Filter according to the invention in the form of a nonwoven having a surface mass of 135 g / m 2 and a weight ratio of fibers (2) to fibers (1) equal to 10:90. The fibers (2) had a titer of 1.5 deniers; fibers (1) had a 3 denier titer F2 Identical to F1 filter with, in addition, an anti-static agent to inhibit electrical charges. F3 Filter with a surface mass equal to 135 g / m 2 , available on the market and produced by a triboelectric process as described in US Pat. No. 5,470,485.

Les résultats obtenus sur ces différents filtres triboélectriques sont les suivants: Identification Masse surfacique (g/m2) Efficacité (%) Perte de pression (mm d'eau) Facteur de qualité F1 135 98 0.5 7.8 F2 135 46 0.5 0.8 F3 135 94 0.4 7.0 The results obtained on these different triboelectric filters are as follows: Identification Area mass (g / m 2 ) Efficiency (%) Pressure loss (mm of water) Quality factor F1 135 98 0.5 7.8 F2 135 46 0.5 0.8 F3 135 94 0.4 7.0

Dans le tableau qui précède, le facteur de qualité est une valeur numérique qui a été calculée avec l'équation suivante:

Figure 00050001
In the preceding table, the quality factor is a numerical value which has been calculated with the following equation:
Figure 00050001

Ce facteur de qualité permet de classer la performance des filtres. Plus la valeur de "Q" est élevé, plus la qualité du filtre est grande.This quality factor makes it possible to classify the performance of the filters. More the higher the value of "Q", the higher the quality of the filter.

Comme on peut le constater, le filtre F1 selon l'invention s'est avéré plus efficace que le filtre connu F3. Les piètres résultats obtenus avec le filtre F2 viennent confirmer que les charges électriques ont une influence importante sur les performance de filtration.As can be seen, the filter F1 according to the invention has been found more efficient than the known filter F3. The poor results obtained with the filter F2 confirm that electrical charges have an important influence on filtration performance.

Les performances du filtre F1 selon l'invention ont montré une bonne stabilité dans le temps. Ce filtre conservé deux ans, n'a montré aucune différence significative entre la valeur initiale d'efficacité et des mesures effectuées 4 mois et 24 mois après sa fabrication.The performance of the filter F1 according to the invention has shown good stability over time. This filter kept for two years, showed no significant difference between the initial value of effectiveness and measures made 4 months and 24 months after its manufacture.

Claims (5)

  1. A triboelectric air filter which consists essentially of a mixture of (1) polypropylene fibers with (2) polymethaphenylene isophatalamide.
  2. A filter of claim 1, characterized in that the fibers (1) and (2) are present in amounts such as the weight ratio of fibers (2) to fiber (1) ranges between 5 :95 and 50 :50.
  3. The filter of claim 2, characterized in that said weight ratio ranges between 10 :90 and 30 :70.
  4. The filter of claim 1, 2, or 3, characterized in that it has a surface weight ranging between 15 and 500 g/m2.
  5. The filter of claim 1, 2, 3 or 4, characterized in that it is in the form of a non-woven.
EP98921296A 1998-05-13 1998-05-13 Triboelectric air filter Expired - Lifetime EP1085934B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CA1998/000470 WO1999058224A1 (en) 1998-05-13 1998-05-13 Triboelectric air filter

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EP1085934A1 EP1085934A1 (en) 2001-03-28
EP1085934B1 true EP1085934B1 (en) 2002-03-20

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US (1) US6328788B1 (en)
EP (1) EP1085934B1 (en)
JP (1) JP2002514494A (en)
AU (1) AU7420898A (en)
CA (1) CA2330805C (en)
DE (1) DE69804361T2 (en)
WO (1) WO1999058224A1 (en)

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JP2002514494A (en) 2002-05-21
EP1085934A1 (en) 2001-03-28
WO1999058224A1 (en) 1999-11-18
DE69804361D1 (en) 2002-04-25
US6328788B1 (en) 2001-12-11
DE69804361T2 (en) 2002-10-10
AU7420898A (en) 1999-11-29
CA2330805A1 (en) 1999-11-18
CA2330805C (en) 2003-09-02

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