WO1997007871A1 - Ultrahigh efficiency filter - Google Patents

Ultrahigh efficiency filter Download PDF

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Publication number
WO1997007871A1
WO1997007871A1 PCT/FR1996/001324 FR9601324W WO9707871A1 WO 1997007871 A1 WO1997007871 A1 WO 1997007871A1 FR 9601324 W FR9601324 W FR 9601324W WO 9707871 A1 WO9707871 A1 WO 9707871A1
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WO
WIPO (PCT)
Prior art keywords
filter
frame
geopolymer
filter according
grids
Prior art date
Application number
PCT/FR1996/001324
Other languages
French (fr)
Inventor
Daniel Bertin
Jean-Marc Boivinet
Original Assignee
Camfil
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 Camfil filed Critical Camfil
Priority to AU68793/96A priority Critical patent/AU6879396A/en
Publication of WO1997007871A1 publication Critical patent/WO1997007871A1/en

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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
    • 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
    • B01D46/0002—Casings; Housings; Frame constructions
    • B01D46/0005—Mounting of filtering elements within casings, housings or frames
    • 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
    • B01D2271/00—Sealings for filters specially adapted for separating dispersed particles from gases or vapours
    • B01D2271/02—Gaskets, sealings

Definitions

  • the present invention relates to the technique of filtering gaseous fluids such as air and it relates more particularly to a very high efficiency air filter capable of stopping particles in suspension in the air to be filtered, the size of which is the order of a few tenths of a micron.
  • Filters of this type are used in particular in the pharmaceutical or food industry where they are intended to preserve the products to be manufactured from contamination by the particles which are in the ambient air. In general, it is in this type of industry that the air purity constraints are the most severe. Thus, these filters can be used for installations called “glove boxes” used for handling in a controlled atmosphere, in machines for packaging sensitive products such as drugs or fruit juices, in the production lines of electronic components. like integrated circuits, etc.
  • a high efficiency filter of the prior art generally comprises a rigid frame made of a metal such as aluminum in which is encased a filter assembly composed for example of a micropore paper folded in accordion, possibly maintained by a device support preventing it from yielding under the action of the difference in pressures on either side of the filter.
  • the filter assembly is made watertight vis-à-vis the frame by means of a lute in which the edges of this assembly are taken and which is applied against the inner surface of the frame.
  • a filter having such a structure can effectively receive the qualification "high efficiency" as long as the temperature of the air to be filtered does not exceed a given value.
  • the air to be filtered must be brought to a temperature such that the local seal, for example at the level of the lut, cannot be guaranteed with respect to the high filtering power prescribed, because of the differences in the expansion coefficients of the materials used, such as the metal of the frame and the material of which the lut.
  • the difference in the expansion coefficients can then lead to the formation of leakage orifices, for example between the frame and the lut, locally deteriorating the efficiency of the filter.
  • the lutes currently available on the market cannot withstand high temperatures since they then become brittle locally and even end up breaking.
  • the filter may also present faults which, even if they are local, will destroy the ability of the filter to meet the requirements of very high efficiency filters. In this respect, it should be noted that this qualification requires that the filter should not allow more than one particle to pass through the IO 4 contained in 1 m 3 of air upstream side to the downstream side.
  • the object of the invention is to provide a filter of the high efficiency type retaining all of its filtering properties, local or global, even at high or even very high temperature.
  • the subject of the invention is therefore a very high efficiency filter comprising a frame in which is encased a filter body by means of a sealing mass made of a cast material in which this body is taken. filter and which adheres to the inner wall of this frame, characterized in that said frame is made of a geopolymer.
  • geopolymers have been described in particular in European patent n ° 0 288 502. It is pointed out in this document that these materials (which, moreover, are given a number of possible compositions), exhibit high mechanical strength and very good resistance to temperature, while being able to be used as plastics. It is also pointed out that these materials can be used to manufacture objects that must have good mechanical behavior when hot, such as small tools or equipment used for the casting of non-ferrous metals.
  • the present invention was made thanks to the observation that these geopolymeric materials also have almost zero coefficients of expansion, are compatible with filter bodies for high-efficiency filters and go perfectly with the micropore papers necessary for making such filters. Thanks to this new application of geopolymers, it is possible to create filters which meet the requirements imposed on very high efficiency filters, even if these are used at high temperatures for long periods of use and during many cycles. temperature rise and fall.
  • FIG. 1 is a perspective view of a part a high efficiency filter according to the invention
  • Figure 2 shows in a plan view one of the faces of a filter according to the invention
  • Figure 3 is a partial sectional view, on a larger scale and taken along line 3-3 of Figure 2.
  • the filter comprises a frame 1 forming a belt whose transverse profile is U-shaped.
  • the wings 1a and 1b of this frame extending inwards.
  • the concavity of the frame profile is turned inward.
  • the frame 1 is produced, preferably in one piece, by molding in a suitable form a composite material formed of a geopolymer and a fibrous filler.
  • a suitable form a composite material formed of a geopolymer and a fibrous filler.
  • the fibrous filler preferably being made up of alumina fibers.
  • a preferred geopolymer is that manufactured under the reference "GEOPOLYCERAM” EP2 by the Geopolymer Company, Industrial Zone. Pont Brenouille, F-60700, Pont- Sainte-Maxence, this material being loaded with alumina fibers.
  • the bottom of the profile forming the frame 1 is filled with a lut 2 preferably occupying about a quarter of the space delimited by the wings la and lb of the frame 1.
  • This lut is preferably also formed of a geopolymer which, in liquid or pasty form, is poured into the space delimited by the bottom and the wings of the frame 1.
  • a preferred product for manufacturing the lut is the geopolymer No. GPS32 sold by the aforementioned Geopolymer Company.
  • the filter body 3 is made of a sheet of micropore paper 4 formed from a fabric of glass fibers folded in an accordion. The edges of this sheet 4 are taken from the mass of the lut 2 when the latter is poured into the frame 1.
  • the corrugations of the paper web 4 are supported by impregnated reinforcing threads 5 which extend in planes perpendicular to the corrugations of the web, while following its corrugations.
  • the strands of the wires 5 being juxtaposed between the corrugations are bonded to each other to give the necessary rigidity to the sheet allowing it to withstand the differential pressure on either side of the filter.
  • each face of the filter is covered with a perforated sheet or protective grid 6. As visible in FIG. 2, each of these grids is folded in the shape of a diamond with the central point 6a facing outwards.
  • each sheet 6 is provided with fixing lugs 7 provided respectively at its four angles.
  • Each tab 7 is formed of a small piece of sheet metal folded in a zig-zag, one end of which is welded to the protective sheet ⁇ and the other end of which is at a certain distance from this sheet 6, greater than the thickness of the wings of the frame 1.
  • the fixing lugs 7 are arranged relative to the edges of the protective sheet in such a way that there remains a certain play, seen in the plane of these sheets, opposite -vis of the inner edges of the wings of frame 1.
  • the purpose of this particular arrangement of the protective sheets 6 is to give them a floating mounting relative to the frame 1, leaving them any freedom of thermal expansion during the temperature variations to which the filter may be subjected during its use.
  • a fiberglass braid 8 is fixed to each sheet 6 by following their periphery. This fixing can be ensured by a neoprene adhesive, for example.
  • a very high quality seal 9 is fixed externally around the periphery of the frame 1
  • This seal 9 is preferably made by means of two strips 9a and 9b of a sealing material and of substantially rectangular section, glued to each other and to the frame 1 by means of a neoprene adhesive.
  • a suitable material for this seal 9 is Lytherm, for example.
  • the braids 8 have the role of absorbing possible tolerances during the mounting of the filter on the confinement structure of the enclosure to be filtered.
  • the braid 8 located near the seal 9 makes it possible to prevent materials, such as glass fibers, from entering the filter body coming from the seal 9, when in the long run it crime.
  • the filter according to the present invention successfully withstands temperatures as high as 350 ° C., which makes it particularly suitable for filtering air intended to penetrate into chambers in which a very high level must prevail. purity, such as for example the packaging chambers of certain drugs, chambers in which the containers must undergo sterilization before being closed.
  • the filter according to the invention because of its resistance to high temperature, then makes it possible to considerably increase the sterilization temperature and consequently to carry out sterilization more quickly than in the past.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Filtering Materials (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)

Abstract

The disclosed filter is comprised of a frame (1) made of a geopolymer and essentially comprised of a U-shaped section of which the concavity is turned inwardly. The body of the filter (3) is encased in a cast mass (2) of geopolymer which adheres to the internal wall of the section. Such construction provides for a perfect tightness at the fixing interface of the filter body (3) despite very high temperature variations that the filter may undergo. Application to ultrahigh efficient filters operating at high temperatures.

Description

FILTRE A TRES HAUTE EFFICACITEVERY HIGH EFFICIENCY FILTER
La présente invention est relative à la technique du filtrage de fluides gazeux tels que l'air et elle concerne plus particulièrement un filtre à air de très haute efficacité capable d'arrêter des particules en suspension dans l'air à filtrer dont la taille est de l'ordre de quelques dixièmes de micron.The present invention relates to the technique of filtering gaseous fluids such as air and it relates more particularly to a very high efficiency air filter capable of stopping particles in suspension in the air to be filtered, the size of which is the order of a few tenths of a micron.
Des filtres de ce type sont utilisés notamment dans l'industrie pharmaceutique ou alimentaire où ils sont destinés à préserver les produits à fabriquer d'une contamination par les particules qui se trouvent dans l'air ambiant. En général, c'est dans ce type d'industrie que les contraintes de pureté de l'air sont les plus sévères. Ainsi, ces filtres peuvent être utilisés pour des installations appelées "boîtes à gants" servant à des manipulations en atmosphère contrôlée, dans des machines de conditionnement de produits sensibles tels que les médicaments ou les jus de fruit, dans les chaînes de fabrication des composants électroniques comme les circuits intégrés, etc. Un filtre à haute efficacité de la technique antérieure comporte en général un cadre rigide réalisé en un métal tel que l'aluminium dans lequel est enchâssé un ensemble de filtrage composé par exemple d'un papier à micropores plié en accordéon, éventuellement maintenu par un dispositif de support lui évitant de céder sous l'action de la différence des pressions de part et d'autre du filtre. L'ensemble de filtrage est rendu etanche vis-à-vis du cadre grâce à un lut dans lequel sont pris les bords de cet ensemble et qui vient s'appliquer contre la surface intérieure du cadre. Un filtre présentant une telle structure peut effectivement recevoir la qualification "haute efficacité" tant que la température de l'air à filtrer ne dépasse pas une valeur donnée. Cependant, dans certains cas, l'air à filtrer doit être porté à une température telle que l'étanchéite locale, par exemple au niveau du lut, ne peut être garantie vis-à-vis du haut pouvoir de filtrage prescrite, en raison des différences des coefficients de dilatation des matériaux utilisés, comme le métal du cadre et le matériau dont est fait le lut. Ainsi, dans l'industrie pharmaceutique, il est souvent nécessaire de filtrer l'air destiné à pénétrer dans une enceinte de stérilisation dans laquelle peut régner une température pouvant aller jusqu'à 350° C ou même davantage, ceci afin d'accélérer le processus de stérilisation autant que faire se peut.Filters of this type are used in particular in the pharmaceutical or food industry where they are intended to preserve the products to be manufactured from contamination by the particles which are in the ambient air. In general, it is in this type of industry that the air purity constraints are the most severe. Thus, these filters can be used for installations called "glove boxes" used for handling in a controlled atmosphere, in machines for packaging sensitive products such as drugs or fruit juices, in the production lines of electronic components. like integrated circuits, etc. A high efficiency filter of the prior art generally comprises a rigid frame made of a metal such as aluminum in which is encased a filter assembly composed for example of a micropore paper folded in accordion, possibly maintained by a device support preventing it from yielding under the action of the difference in pressures on either side of the filter. The filter assembly is made watertight vis-à-vis the frame by means of a lute in which the edges of this assembly are taken and which is applied against the inner surface of the frame. A filter having such a structure can effectively receive the qualification "high efficiency" as long as the temperature of the air to be filtered does not exceed a given value. However, in certain cases, the air to be filtered must be brought to a temperature such that the local seal, for example at the level of the lut, cannot be guaranteed with respect to the high filtering power prescribed, because of the differences in the expansion coefficients of the materials used, such as the metal of the frame and the material of which the lut. Thus, in the pharmaceutical industry, it is often necessary to filter the air intended to penetrate into a sterilization enclosure in which a temperature can go up to 350 ° C or even more, this in order to accelerate the process sterilization as much as possible.
La différence des coefficients de dilatation peut alors entraîner la formation d'orifices de fuite par exemple entre le cadre et le lut, détériorant localement l'efficacité du filtre. A cela s'ajoute que les luts actuellement disponibles sur le marché ne supportent pas des températures élevées puisqu'ils deviennent alors friables localement et finissent même par se casser. Le filtre risque ainsi de présenter également des défauts qui, même s'ils sont locaux, détruiront la capacité du filtre à satisfaire les exigences des filtres à très haute efficacité. A cet égard, il faut noter que cette qualification exige que le filtre ne doit au plus laisser passer vers le côté aval qu'une particule sur IO4 contenues dans 1 m3 d'air côté amont.The difference in the expansion coefficients can then lead to the formation of leakage orifices, for example between the frame and the lut, locally deteriorating the efficiency of the filter. In addition, the lutes currently available on the market cannot withstand high temperatures since they then become brittle locally and even end up breaking. The filter may also present faults which, even if they are local, will destroy the ability of the filter to meet the requirements of very high efficiency filters. In this respect, it should be noted that this qualification requires that the filter should not allow more than one particle to pass through the IO 4 contained in 1 m 3 of air upstream side to the downstream side.
L'invention a pour but de fournir un filtre du type à haute efficacité conservant toutes ses propriétés de filtrage, locales ou globales, même à haute, voire à très haute température. L'invention a donc pour objet un filtre à très haute efficacité comprenant un cadre dans lequel est enchâssé un corps de filtre par l'intermédiaire d'une masse d'étanchéité faite en un matériau coulé dans lequel est pris ce corps de filtre et qui adhère à la paroi intérieure de ce cadre, caractérisé en ce que ledit cadre est réalisé en un géopolymère.The object of the invention is to provide a filter of the high efficiency type retaining all of its filtering properties, local or global, even at high or even very high temperature. The subject of the invention is therefore a very high efficiency filter comprising a frame in which is encased a filter body by means of a sealing mass made of a cast material in which this body is taken. filter and which adheres to the inner wall of this frame, characterized in that said frame is made of a geopolymer.
Les géopolymères ont été décrits notamment dans le brevet européen n° 0 288 502. On signale dans ce document que ces matériaux (dont on donne d'ailleurs un certain nombre de compositions possibles) , présentent une haute résistance mécanique et une très bonne tenue en température, tout en pouvant être mis en oeuvre comme des matières plastiques. On signale également que ces matériaux sont utilisables pour fabriquer des objets devant avoir un bon comportement mécanique à chaud, comme par exemple du petit outillage ou du matériel utilisé pour la coulée de métaux non ferreux. Cependant, la présente invention a été faite grâce à la constatation que ces matériaux géopolymères ont également des coefficients de dilatation quasi nuls, sont compatibles avec des corps de filtre pour filtres de haute efficacité et se marient parfaitement avec les papiers à micropores nécessaires pour la confection de tels filtres. Ainsi, grâce à cette nouvelle application des géopolymères, on peut créer des filtres qui satisfont les exigences imposées aux filtres à très haute efficacité, même si ceux-ci sont utilisés à des températures élevées pendant des temps d'utilisation prolongés et durant de nombreux cycles de montée et de descente en température.The geopolymers have been described in particular in European patent n ° 0 288 502. It is pointed out in this document that these materials (which, moreover, are given a number of possible compositions), exhibit high mechanical strength and very good resistance to temperature, while being able to be used as plastics. It is also pointed out that these materials can be used to manufacture objects that must have good mechanical behavior when hot, such as small tools or equipment used for the casting of non-ferrous metals. However, the present invention was made thanks to the observation that these geopolymeric materials also have almost zero coefficients of expansion, are compatible with filter bodies for high-efficiency filters and go perfectly with the micropore papers necessary for making such filters. Thanks to this new application of geopolymers, it is possible to create filters which meet the requirements imposed on very high efficiency filters, even if these are used at high temperatures for long periods of use and during many cycles. temperature rise and fall.
D'autres caractéristiques et avantages de l'invention apparaîtront au cours de la description qui va suivre, donnée uniquement à titre d'exemple et faite en se référant aux dessins annexés sur lesquels: la figure 1 est une vue en perspective d'une partie d'un filtre à haute efficacité suivant l'invention; la figure 2 montre par une vue en plan l'une des faces d'un filtre selon l'invention; et la figure 3 est une vue en coupe partielle, à plus grande échelle et prise selon la ligne 3-3 de la figure 2. Selon le mode de réalisation de l'invention représenté à titre d'exemple sur les figures, le filtre comprend un cadre 1 formant une ceinture dont le profil transversal est en forme de U. Les ailes la et lb de ce cadre s'étendant vers l'intérieur. Ainsi, la concavité du profil du cadre est tournée vers l'intérieur.Other characteristics and advantages of the invention will emerge during the description which follows, given solely by way of example and made with reference to the appended drawings in which: FIG. 1 is a perspective view of a part a high efficiency filter according to the invention; Figure 2 shows in a plan view one of the faces of a filter according to the invention; and Figure 3 is a partial sectional view, on a larger scale and taken along line 3-3 of Figure 2. According to the embodiment of the invention shown by way of example in the figures, the filter comprises a frame 1 forming a belt whose transverse profile is U-shaped. The wings 1a and 1b of this frame extending inwards. Thus, the concavity of the frame profile is turned inward.
Selon l'invention, le cadre 1 est réalisé, de préférence en une seule pièce, par moulage dans une forme appropriée d'un matériau composite formé d'un géopolymère et d'une charge fibreuse. On utilisera pour ce matériau de préférence l'un de ceux décrits dans le brevet européen EP 0 288 502, la charge fibreuse étant de préférence constituée de fibres d'alumine.According to the invention, the frame 1 is produced, preferably in one piece, by molding in a suitable form a composite material formed of a geopolymer and a fibrous filler. One will preferably use for this material one of those described in European patent EP 0 288 502, the fibrous filler preferably being made up of alumina fibers.
Il s'est avéré que dans ces conditions, le cadre 1 est quasiment insensible aux variations de température et ne présente aucun phénomène de dilatation thermique. Un géopolymère préféré est celui fabriqué sous la référence "GEOPOLYCERAM" EP2 par la Société Géopolymère, Zone Industrielle. Pont Brenouille, F-60700, Pont-Sainte-Maxence, ce matériau étant chargé de fibres d'alumine. Le fond le du profilé formant le cadre 1 est rempli d'un lut 2 occupant de préférence à peu près le quart de l'espace délimité par les ailes la et lb du cadre 1. Ce lut est de préférence formé également d'un géopolymère qui, sous forme liquide ou pâteuse, est coulé dans l'espace délimité par le fond et les ailes du cadre 1. Un produit préféré pour fabriquer le lut est le géopolymère n° GPS32 vendu par la Société Géopolymère précitée. Le corps de filtre 3 est réalisé en une nappe de papier à micropores 4 formée d'un tissu de fibres de verre plié en accordéon. Les bords de cette nappe 4 sont pris dans la masse du lut 2 au moment de la coulée de ce dernier dans le cadre 1.It has been found that under these conditions, the frame 1 is almost insensitive to temperature variations and does not exhibit any phenomenon of thermal expansion. A preferred geopolymer is that manufactured under the reference "GEOPOLYCERAM" EP2 by the Geopolymer Company, Industrial Zone. Pont Brenouille, F-60700, Pont-Sainte-Maxence, this material being loaded with alumina fibers. The bottom of the profile forming the frame 1 is filled with a lut 2 preferably occupying about a quarter of the space delimited by the wings la and lb of the frame 1. This lut is preferably also formed of a geopolymer which, in liquid or pasty form, is poured into the space delimited by the bottom and the wings of the frame 1. A preferred product for manufacturing the lut is the geopolymer No. GPS32 sold by the aforementioned Geopolymer Company. The filter body 3 is made of a sheet of micropore paper 4 formed from a fabric of glass fibers folded in an accordion. The edges of this sheet 4 are taken from the mass of the lut 2 when the latter is poured into the frame 1.
Les ondulations de la nappe de papier 4 sont soutenues par des fils de renfort imprégnés 5 qui s'étendant dans des plans perpendiculaires aux ondulations de la nappe, tout en suivant ses ondulations. Les brins des fils 5 se trouvant juxtaposés entre les ondulations sont collés les uns aux autres pour donner la rigidité nécessaire à la nappe lui permettant de résister à la pression différentielle de part et d'autre du filtre.The corrugations of the paper web 4 are supported by impregnated reinforcing threads 5 which extend in planes perpendicular to the corrugations of the web, while following its corrugations. The strands of the wires 5 being juxtaposed between the corrugations are bonded to each other to give the necessary rigidity to the sheet allowing it to withstand the differential pressure on either side of the filter.
Chaque face du filtre est recouverte d'une tôle perforée ou grille de protection 6. Comme visible sur la figure 2, chacune de ces grilles est pliée en forme de diamant avec la pointe centrale 6a tournée vers l'extérieur.Each face of the filter is covered with a perforated sheet or protective grid 6. As visible in FIG. 2, each of these grids is folded in the shape of a diamond with the central point 6a facing outwards.
En outre, chaque tôle 6 est pourvue de pattes de fixation 7 prévues respectivement à ses quatre angles. Chaque patte 7 est formée d'une petite pièce en tôle pliée en zig-zag dont l'une des extrémités est soudée à la tôle de protection β et dont l'autre extrémité se trouve à une certaine distance de cette tôle 6, supérieure à l'épaisseur des ailes du cadre 1. De plus, les pattes de fixation 7 sont disposées par rapport aux bords de la tôle de protection de telle manière qu'il subsiste un certain jeu, vu dans le plan de ces tôles, vis-à-vis des tranches intérieures des ailes du cadre 1.In addition, each sheet 6 is provided with fixing lugs 7 provided respectively at its four angles. Each tab 7 is formed of a small piece of sheet metal folded in a zig-zag, one end of which is welded to the protective sheet β and the other end of which is at a certain distance from this sheet 6, greater than the thickness of the wings of the frame 1. In addition, the fixing lugs 7 are arranged relative to the edges of the protective sheet in such a way that there remains a certain play, seen in the plane of these sheets, opposite -vis of the inner edges of the wings of frame 1.
Cette disposition particulière des tôles de protection 6 a pour but de leur conférer un montage flottant par rapport' au cadre 1 en leur laissant tout liberté de dilatation thermique pendant les variations de température auxquelles le filtre peut être soumis au cours de son utilisation. Une tresse en fibre de verre 8 est fixée sur chaque tôle 6 en suivant .leur périphérie. Cette fixation peut être assurée par une colle au néoprène, par exemple. Du côté de l'enceinte dont l'atmosphère doit être filtrée (c'est-à-dire en haut comme vue sur la figure 3), un joint d'étanchéité 9 de très haute qualité est fixée extérieurement sur le pourtour du cadre 1. Ce joint 9 est réalisée de préférence au moyen de deux bandes 9a et 9b d'un matériau d'étanchéité et de section sensiblement rectangulaire, collées l'une à l'autre et au cadre 1 par l'intermédiaure d'une colle néoprène. Un matériau approprié pour ce joint 9 est le Lytherm, par exemple.The purpose of this particular arrangement of the protective sheets 6 is to give them a floating mounting relative to the frame 1, leaving them any freedom of thermal expansion during the temperature variations to which the filter may be subjected during its use. A fiberglass braid 8 is fixed to each sheet 6 by following their periphery. This fixing can be ensured by a neoprene adhesive, for example. On the side of the enclosure, the atmosphere of which must be filtered (that is to say at the top as seen in FIG. 3), a very high quality seal 9 is fixed externally around the periphery of the frame 1 This seal 9 is preferably made by means of two strips 9a and 9b of a sealing material and of substantially rectangular section, glued to each other and to the frame 1 by means of a neoprene adhesive. . A suitable material for this seal 9 is Lytherm, for example.
Les tresses 8 ont pour rôle d'absorber d'éventuelles tolérances au cours du montage du filtre sur la structure de confinement de l'enceinte à filtrer. En outre, la tresse 8 se trouvant située près du joint 9 permet d'empêcher que des matières, telles que des fibres de verre, puissent entrer dans le corps de filtre en provenance du joint 9, lorsqu'à la longue celui-ci se délite. II s'est avéré que le filtre selon la présente invention résiste avec succès à des températures aussi élevées que 350°C, ce qui le rend particulièrement approprié pour filtrer de l'air destiné à pénétrer dans des enceintes dans lesquelles doit régner une très haute pureté, comme par exemple les chambres de conditionnement de certains médicaments, chambres dans lesquelles les récipients doivent subir une stérilisation avant d'être fermés. Le filtre selon l'invention, du fait de sa résistance à haute température, permet alors d'augmenter considérablement la température de stérilisation et par conséquent d'effectuer la stérilisation plus rapidement que par le passé. The braids 8 have the role of absorbing possible tolerances during the mounting of the filter on the confinement structure of the enclosure to be filtered. In addition, the braid 8 located near the seal 9 makes it possible to prevent materials, such as glass fibers, from entering the filter body coming from the seal 9, when in the long run it crime. It has been found that the filter according to the present invention successfully withstands temperatures as high as 350 ° C., which makes it particularly suitable for filtering air intended to penetrate into chambers in which a very high level must prevail. purity, such as for example the packaging chambers of certain drugs, chambers in which the containers must undergo sterilization before being closed. The filter according to the invention, because of its resistance to high temperature, then makes it possible to considerably increase the sterilization temperature and consequently to carry out sterilization more quickly than in the past.

Claims

REVENDICATIONS
1. Filtre à très haute efficacité comprenant un cadre (1) dans lequel est enchâssé un corps de filtre (3) par l'intermédiaire d'une masse d'étanchéité (2) faite d'un matériau coulé dans lequel est pris ce corps de filtre (3) et qui adhère à la paroi intérieure de ce cadre (1) caractérisé en ce que ledit cadre (1) est réalisé en un géopolymère. 1. Very high efficiency filter comprising a frame (1) in which a filter body (3) is embedded by means of a sealing mass (2) made of a cast material in which this body is taken filter (3) and which adheres to the inner wall of this frame (1) characterized in that said frame (1) is made of a geopolymer.
2. Filtre suivant la revendication 1, caractérisé en ce que le cadre (1) est fait d'un profilé en forme de U dont la concavité est tournée vers l'intérieur et dans lequel est coulé la masse d'étanchéité (2) .2. Filter according to claim 1, characterized in that the frame (1) is made of a U-shaped profile whose concavity is turned inward and in which is poured the sealing mass (2).
3. Filtre suivant l'une des revendications 1 et 2, caractérisé en ce que ladite masse d'étanchéité (2) est réalisée en un géopolymère.3. Filter according to one of claims 1 and 2, characterized in that said sealing mass (2) is made of a geopolymer.
4. Filtre suivant l'une des revendications 2 et 3, caractérisé en ce que des grilles de protection (6) recouvrent chaque face du filtre et en ce que chacune de ces grilles (6) est montée sur ledit cadre (1) par un montage flottant en permettant la dilatation thermique.4. Filter according to one of claims 2 and 3, characterized in that protective grids (6) cover each face of the filter and in that each of these grids (6) is mounted on said frame (1) by a floating mounting allowing thermal expansion.
5. Filtre suivant la revendication 4, caractérisée en ce qu'une tresse (8), de préférence en fibres de verre, est fixée extérieurement sur chacune desdites grilles (6) à la périphérie de celles-ci, afin de pouvoir absorber au cours du montage du filtre sur une structure de support, les tolérances de celle-ci.5. Filter according to claim 4, characterized in that a braid (8), preferably made of glass fibers, is fixed externally on each of said grids (6) at the periphery thereof, in order to be able to absorb during the mounting of the filter on a support structure, the tolerances thereof.
6. Filtre suivant l'une quelconque des revendications précédentes, caractérisée en ce qu'un joint de haute qualité (9) est fixé sur le bord dudit cadre (1) contre la face du filtre destinée à être tournée vers l'enceinte dont l'atmosphère doit être pure. 6. Filter according to any one of the preceding claims, characterized in that a high quality seal (9) is fixed on the edge of said frame (1) against the face of the filter intended to be turned towards the enclosure, the l must be pure.
PCT/FR1996/001324 1995-08-29 1996-08-27 Ultrahigh efficiency filter WO1997007871A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU68793/96A AU6879396A (en) 1995-08-29 1996-08-27 Ultrahigh efficiency filter

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9510175A FR2738164B1 (en) 1995-08-29 1995-08-29 VERY HIGH EFFICIENCY FILTER
FR95/10175 1995-08-29

Publications (1)

Publication Number Publication Date
WO1997007871A1 true WO1997007871A1 (en) 1997-03-06

Family

ID=9482141

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FR1996/001324 WO1997007871A1 (en) 1995-08-29 1996-08-27 Ultrahigh efficiency filter

Country Status (3)

Country Link
AU (1) AU6879396A (en)
FR (1) FR2738164B1 (en)
WO (1) WO1997007871A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1350550A1 (en) * 2002-03-22 2003-10-08 Cnh U.K. Limited Filter element
IT201600122425A1 (en) * 2016-12-02 2018-06-02 Sagicofim Spa Improved filter.

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2762231B1 (en) * 1997-04-16 1999-07-02 Camfil HIGH TEMPERATURE RESISTANT FILTER, PARTICULARLY FOR PAINT INSTALLATION
DE10325030B4 (en) * 2003-06-02 2012-09-27 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Exhaust system for a motor vehicle
US7745363B2 (en) * 2005-05-09 2010-06-29 Corning Incorporated Geopolymer composites and structures formed therefrom

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1542263A (en) * 1976-04-22 1979-03-14 Marshall D High temperature resistant fluid filter
DE2943772A1 (en) * 1979-10-26 1981-05-07 Delbag-Luftfilter Gmbh, 1000 Berlin Universal filter element for removing dust from air - where round or rectangular filter casings are made by cutting and bending metal sheet
WO1988002741A1 (en) * 1986-10-14 1988-04-21 Nicolas Davidovits Ceramic-ceramic composite material and production method

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1542263A (en) * 1976-04-22 1979-03-14 Marshall D High temperature resistant fluid filter
DE2943772A1 (en) * 1979-10-26 1981-05-07 Delbag-Luftfilter Gmbh, 1000 Berlin Universal filter element for removing dust from air - where round or rectangular filter casings are made by cutting and bending metal sheet
WO1988002741A1 (en) * 1986-10-14 1988-04-21 Nicolas Davidovits Ceramic-ceramic composite material and production method
EP0288502A1 (en) * 1986-10-14 1988-11-02 Nicolas Davidovits Ceramic-ceramic composite material and production method.

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1350550A1 (en) * 2002-03-22 2003-10-08 Cnh U.K. Limited Filter element
IT201600122425A1 (en) * 2016-12-02 2018-06-02 Sagicofim Spa Improved filter.
EP3329980A1 (en) * 2016-12-02 2018-06-06 Sagicofim SpA Filter with thermal expansion compensator

Also Published As

Publication number Publication date
AU6879396A (en) 1997-03-19
FR2738164B1 (en) 1997-11-28
FR2738164A1 (en) 1997-03-07

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