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WO2025031684A1 - Procédé de fabrication d'un filtre - Google Patents

Procédé de fabrication d'un filtre Download PDF

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Publication number
WO2025031684A1
WO2025031684A1 PCT/EP2024/068734 EP2024068734W WO2025031684A1 WO 2025031684 A1 WO2025031684 A1 WO 2025031684A1 EP 2024068734 W EP2024068734 W EP 2024068734W WO 2025031684 A1 WO2025031684 A1 WO 2025031684A1
Authority
WO
WIPO (PCT)
Prior art keywords
filter
matrix
filter body
fibers
separating device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/EP2024/068734
Other languages
German (de)
English (en)
Inventor
Dominic SCHNEIDER
Martin Hegmann
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.)
Hydac Filter Systems GmbH
Original Assignee
Hydac Filter Systems GmbH
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 Hydac Filter Systems GmbH filed Critical Hydac Filter Systems GmbH
Publication of WO2025031684A1 publication Critical patent/WO2025031684A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
    • B01D29/111—Making filtering elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
    • B01D29/13—Supported filter elements
    • B01D29/15—Supported filter elements arranged for inward flow filtration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/02—Loose filtering material, e.g. loose fibres
    • B01D39/04—Organic material, e.g. cellulose, cotton
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2201/00—Details relating to filtering apparatus
    • B01D2201/04—Supports for the filtering elements
    • B01D2201/0415—Details of supporting structures
    • 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
    • B01D2239/0654—Support 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
    • B01D2239/10—Filtering material manufacturing

Definitions

  • the invention relates to a method for producing a filter.
  • DE 10 2016 013 166 A1 discloses a filter element which is designed as a replacement element, the filter medium of which is designed as a hollow body and extends between two end parts, in particular in the form of end caps, and is pleated with individual filter folds, the filter medium in question comprising a filter material made of cellulose.
  • the filter medium consisting of cellulose material can be used with particular advantage in the known solution for separating water from hydraulic oils, whereby the filter medium increases the volume of the water droplets in the water-oil mixture, which sink due to the difference in density between water and oil and under the effect of gravity, whereby a separation process takes place under the influence of gravity.
  • the filter medium which is made of cellulose, has a uniform thickness of more than 2 mm, with filter folds of the same height, which have the same bending or folding radii on the valley and peak sides. With this uniform thickness and the uniform fold geometry, a strong coalescence effect can be achieved, which enables particularly effective water separation with the known filter body.
  • a manufacturing process is used which comprises at least the following manufacturing steps:
  • a filter element and method for its production are known from DE 696 24 632 T2.
  • the filter element has a cylindrical section which is formed from a so-called slurry of main fibers and microfibers, of which the main fibers have a fiber diameter of at least five micrometers and microfibers have a fiber diameter of less than five micrometers, wherein several longitudinal grooves are formed in an outer and/or inner surface of the cylindrical section, whereby the cylindrical section has thin and thick sections all around and wherein the cylindrical section has a fiber density gradient in its circumferential direction, such that the thick section has a low density and the thin section, in contrast, has a high density.
  • filters made in this way do not absorb enough dirt from the fiber material, especially cellulose, due to the thin walls caused by the precoating process.
  • the wall thickness is limited because the cellulose does not stick to the tool in the form of the separating device due to gravity.
  • US 201 7/0341004 A1 discloses a candle filter with a hollow cylindrical element body which is closed on one side in one piece by a curved dome part and has on its other, opposite side an annular extension compared to its other outer circumference, by means of which the respective candle filter for the filtration of hot gas streams can be suspended vertically in an exchangeable manner in a pot-shaped filter housing.
  • the known candle filter can be obtained by vacuum forming in a solid manufacturing mold adapted to the shape of the candle, into which a suspension is introduced, consisting of high-temperature-resistant inorganic fibers mixed with at least one binder and a carrier liquid, in order to obtain a green body as an intermediate product, which is then dried and further processed towards the finished filter product.
  • this object is achieved by a method for producing a filter from fibers for a filter element with at least the following method steps:
  • a type of stabilizer is created for the washed-up fiber layer, especially the cellulose layer. Thanks to the inherently stable matrix, the fiber material thickens and becomes more stable, resulting in a higher dirt-absorbing capacity for the element material.
  • filter elements with a large wall thickness can be produced with a significantly improved dirt-absorbing capacity compared to the known solutions.
  • the filter element produced by the method according to the invention consists of at least one layer of fiber material, such as cellulose, with the matrix as a stabilizer and the possibility of replacing the fiber material (cellulose) with additional substances, for example in the form of volatilizing placeholders. or by means of mechanical processing to make the pore size more open or closed.
  • the matrix can protrude visibly from the cellulose.
  • the matrix is formed from individual threads and/or fibers that are loosely and/or at least partially connected to one another at nodes.
  • a matrix is understood to be a material in which other components are or can be embedded.
  • the threads or fibers of the matrix are randomly oriented in the manner of a fleece or are provided with a predeterminable orientation in the context of a woven, knitted or crocheted fabric.
  • cavities are formed between the threads or fibers, which can be occupied by the washed-up or deposited cellulose material in order to achieve an inherently stable cellulose element structure for a filter element.
  • the structure of the matrix can also specify free spaces that are not filled with cellulose.
  • the matrix is in any case provided with a predeterminable porosity, whereby the matrix can also basically be formed from a type of sponge with preferably open-pore cavities in the sponge structure for the deposition of the cellulose material when washed up.
  • the matrix is subjected to a thermal treatment in the form of heating before the precoating process and the precoating of the fibers takes place at least during the subsequent cooling.
  • a thermal treatment in the form of heating before the precoating process and the precoating of the fibers takes place at least during the subsequent cooling.
  • this can either contract or expand due to heat, thereby creating additional cavities along the threads. which allows a fluid to penetrate deeper into the cellulose or the cellulose is compressed accordingly, which makes it more difficult for the fluid to penetrate into the cellulose, so that the filter fineness can be adjusted in this way.
  • cavities can also form along the threads within the cellulose, which are then not filled with fiber material, such as cellulose, and enable further adjustment options for achieving a predefined filter fineness.
  • the filter body is subjected to further process steps during or after its production, such as
  • the threads and/or fibers of the matrix are obtained from plastic and/or metal materials.
  • plastic materials can be used which form adhesive surfaces for the adhesion of the washed-up fiber material, in particular in the form of cellulose fibers.
  • the matrix is set up as a flat strip material to form a hollow-cylindrical, inherently stable support body, so that the hollow filter body is already inherently stable during the precoating process, which benefits the further, process-reliable construction of the element material.
  • the suspension is stored in a tank in which a separating device is accommodated below a liquid level in the tank, which is surrounded by the matrix, and a pressure gradient is built up by means of a vacuum device acting on a separating device in such a way that the fibers are deposited by being washed onto the filter wall.
  • seamless or seamless filter bodies can be created in this way, which are closed on the periphery and have a uniform wall thickness, which is stiffened accordingly by the incorporation of the matrix.
  • both the mechanical load-bearing capacity in later filtration operation and a strength that ensures stability can be specified, so that, depending on the wall thickness structure, filter bodies and later filter elements can be produced that can be adapted to the most diverse filtration tasks, something that has no equivalent in the state of the art.
  • the separating device remains in the tank and the filter body obtained in each case is removed from the separating device and taken out of the tank, or that the separating device is designed in the manner of a support tube body and is removed from the tank together with the filter body.
  • the separating device to be arranged in the tank can be adapted in the manner of a manufacturing tool comparable to a conventional support tube body for the filter element material, the possibility is opened up to leave the separating device as a support tube body in the filter body in order to complete the process towards a complete filter element, with the matrix preferably forming a reliable connection with such a support tube body.
  • keeping the separating device in the tank guarantees a rapid sequence of filter bodies to be produced as part of a rationalized production process.
  • the washing of the fibers from the suspension is terminated at the earliest after obtaining a filter body which is closed at one end and consists of the filter medium with a predetermined wall thickness, the integral component of which is a stable matrix.
  • the filter body which is closed at the end is cut free in order to obtain a hollow cylindrical element structure with two opposite central openings, with the closed end being eliminated. This results in a smooth cutting edge geometry, which improves the connection of an end cap to the element material, for example in the context of an adhesive bond.
  • the closed end of the filter body which is preferably formed from a dome, in particular in the form of a shell, particularly preferably in the form of a hollow hemisphere, increases the inherent stability at a free end of the element body in addition to the embedded matrix, so that the precoating process with the fiber material can be carried out in a particularly reliable manner. If the method according to the invention allows the production of a filter body that is held between two end caps, a tradeable and thus exchangeable filter assembly is created as a whole, which can be used for a wide variety of filtration tasks in device housings.
  • At least one end cap is provided with a sealing device which is arranged in the direction of the adjacent central opening of the filter body. Thanks to the sealing device, the filter element can be connected to third-party components, for example to fluid-carrying components in a device or filter housing.
  • the method according to the invention can enable the filter body made of fiber material to be surrounded by a further filter medium, preferably in pleated form, in order to achieve effective particle removal in an unfiltered stream by means of the further filter medium, which passes through the filter body or the filter element, and the filter element made of washed-up fibers with matrix can serve to separate so-called varnish or oil aging products from a fluid stream and/or as already described in the prior art.
  • varnish is understood to mean temperature-soluble, usually gel-like aging products of the oil or related contamination.
  • cellulose fibers that are absorbed in plenty of water to form a suspension, whereby the suspension can be provided with other components, such as fillers, additives and filter aids.
  • the manufacturing process according to the invention does not need to be restricted to cellulose fibers.
  • any fiber material that can be brought into suspension and that satisfies the subsequent filtration tasks and can be easily incorporated or bonded to a matrix is suitable.
  • the manufacturing process according to the invention using the matrix as a stabilizer leads to inherently stable filter bodies and filter elements formed therefrom, the filter medium of which can be designed seamlessly in a variety of geometric shapes with a predetermined wall thickness.
  • Fig. 1 shows a highly simplified structure of the manufacturing device
  • Fig. 2 shows a filter body as obtained with the manufacturing device according to Fig. 1;
  • Fig. 3 and 4 show the filter body according to Fig. 2, which in a further manufacturing step by means of end cutting according to Fig. 3 results in a hollow cylindrical filter body according to Fig. 4; once in longitudinal section, once in bottom view and once in perspective top view of the filter body according to Figure 2 with inserted support tube body forming a filter element as a whole; once in longitudinal section, once in bottom view and once in perspective top view of a filter element body according to Fig. 4 with inserted support tube body to form another type of filter element; the filter element according to Fig. 8 to 10 in a corresponding representation with additional filter medium arranged on the circumference; and a section of the matrix as a fleece in top view.
  • Figure 1 shows a schematic view of a fluid tank 10 used to store a liquid suspension.
  • a separating device 14 is accommodated below a predeterminable liquid level 12 in the tank 10.
  • the separating device 14 has an outer wall 16 which is penetrated by a continuous perforation, which is not shown in Figure 1 for the sake of simplicity.
  • the outer wall 16 has a hollow cylindrical wall part 18 and an adjoining, dome-shaped wall part 20.
  • the outer wall 16 can have a support device 22 made up of longitudinal and transverse rods.
  • the hollow cylindrical separating device 14 with its outer wall 16, as seen in the direction of Figure 1 is designed to be open towards the bottom and is firmly connected to the relevant tank wall 24, in particular in the transition to the lower tank wall area.
  • a collecting container 28 is connected to the relevant fluid tank 10 as part of a vacuum device 26, which is connected on the inlet side with a connection 30 to the lower tank wall 24 and with a further connection 32 and connecting line 33, the collecting container 28 is connected to a vacuum pump (not shown in detail), which can generate a negative pressure in the collecting container 28 during operation and on the inside of the outer wall 16 of the separating device 14, which opens with its interior into the media-carrying connection 30.
  • the possible flow direction from the interior of the separating device 14 via the connection 30 to the collecting container 28 and via the further connection 32 and line 33 to a vacuum pump is indicated with arrows in Figure 1.
  • the matrix 37 shown in detail in Figure 14 is formed in the present embodiment from a fleece 41 with randomly distributed, individual threads 39 of a predeterminable length, which are partially firmly connected to one another at nodes.
  • Plastic threads are used, for example made of polyamide, which can be connected to one another at the individual nodes using heat and pressure or using appropriate binding agents.
  • the production of random fiber fleeces of this kind is common practice, so it will not be discussed in more detail here.
  • the matrix section according to Figure 14 can be enlarged in all three directions that are perpendicular to one another, in particular the thickness of the matrix 37 can be specified within a wide range in order to later obtain cellulose filters with a correspondingly large wall thickness.
  • the band-shaped matrix material is to be set up and closed to form a cylindrical hollow body, in order to then be pushed onto the rod-shaped separating device 14 along its outer wall 16 as shown in Figure 1.
  • the hollow cylindrical matrix body ends in the direction of view of Figure 1 with its Bottom side on the top side of the tank wall 24 and has a height in the axial longitudinal extension that corresponds to the height of how long the filter element 38 is to be later.
  • the dome to be formed as the end 20 of the element material can, however, be kept free of the matrix, since the dome-shaped end 20 in question is cut off anyway, which is explained in more detail below.
  • the matrix starting material according to Figure 14 initially still has its own elasticity, so that the hollow cylindrical peripheral shell of the matrix 37 can be pushed particularly well onto the outer wall 16 of the separating device 14, the matrix 37 hardens further as soon as the fiber material from the suspension is washed onto or into the matrix cavities.
  • an extremely inherently stable filter body 36 is created.
  • the cavities in the matrix 37 can also be compacted by using the liquid in the fluid tank 10 in a similar way to an ultrasonic bath. It is also possible to subject the matrix 37 to ultrasonic vibrations on the base side during the production process of the filter body 36, which can be introduced into the element body via the lower tank wall 24, for example.
  • the suspension contained in the fluid or storage tank 10 comprises a liquid, for example water, which contains individual fibers not shown in detail.
  • a liquid for example water
  • other substances can be part of the suspension. These include, for example, fillers such as silicates (e.g. kaolin), carbon- nates (e.g. chalk), sulfates (e.g. gypsum or barium sulfate), oxides (e.g. titanium dioxide) and other fiber material, for example in the form of aramid fibers, carbon fibers, etc.
  • Additives can also be incorporated into the suspension, such as sizing agents, binder systems, dry and wet strength agents, pigments, dyes, dewatering and retention agents and defoamers.
  • sizing agents such as sizing agents, binder systems, dry and wet strength agents, pigments, dyes, dewatering and retention agents and defoamers.
  • Diatomaceous earth, silica gel, perlite, zeolites and activated carbon have proven to be suitable filter aids for the suspension.
  • the suspension mentioned can be continuously replenished into the fluid tank 10 by means of a supply device (not shown in detail).
  • the liquid level 12 of the suspension covers the separating device 14 along its upper side at a predeterminable distance during the precoating process.
  • a pressure gradient builds up on the outer wall 16 of the separating device 14, with the result that the fibers from the suspension are deposited in the matrix 37 by being washed out, forming a porous filter wall 34.
  • the layered construction of the filter wall 34 in question thus takes place with a gradually increasing wall thickness of a filter medium 35 by washing the fibers from the suspension, whereby the liquid or aqueous portions of the suspension, after the fibers have settled in the pore structure of the matrix 37, pass through the perforation in the outer wall 16 of the separating device 14 via the lower connection 30 into the collecting container 28 and from there continue in the direction of the vacuum pump via the further connection 32 and the line 33.
  • the washing or separation process can continue until a filter cake is deposited in the matrix 37, with a filter wall 34 of a predetermined wall thickness.
  • a filter cake or independent filter body 36 can be seamlessly created in a simple manner. with a wall thickness that can be set almost as desired.
  • the liquid suspension is attracted by the pressure difference, i.e. the pressure gradient generated by the vacuum device 26, which leads to more and more fiber material, particularly in the form of cellulose fibers, being deposited uniformly around the outer wall 16 of the separating device 14 within the matrix 37 until the desired wall thickness for the filter wall 34 is achieved.
  • the wall thickness that can be achieved is limited by the finite differential pressure that arises because the pores in the matrix 37 are more or less blocked with fiber material over time.
  • a filter body 36 according to the design according to Figure 1 is obtained via the manufacturing process shown, the filter body 36 is removed from the separating device 14 together with the matrix 37 and the separated fiber material, the filter body 36 in question being shown as an example in Figure 2.
  • the separating device 14 remains in the fluid tank 10 and is available for a new precoating process with fiber material for the purpose of producing a new filter body 36.
  • a support tube body 40 can be introduced into the inside of the filter body 36 closed at the top, as shown in Figures 5, 6, 7, which is formed from longitudinal and transverse rods 42 and 44, respectively.
  • longitudinal rods 42 form a three-winged flow guide body 46, which is surrounded radially at its free ends by the ring-like cross rods 44.
  • a continuous perforation (not shown in detail) is introduced into the outer wall 48 of the relevant support tube body 40, which allows the fluid to be guided downwards on the inside of the support tube body 40 in the direction of a lower end cap 50 when flowing through the filter element 38 from the outside to the inside.
  • the end cap 50 which is designed in a ring shape in this way, has a central opening 52, which is delimited on the edge by a sealing ring 54 for the purpose of sealing the filter element 38 to device parts (not shown in detail) of an associated filter housing.
  • the end cap 50 has, as viewed in the direction of Figure 6 and in particular as viewed in relation to the longitudinal axis of the filter element 38, two diametrically opposite projecting wings 56 which allow the filter element 38 to be connected in the manner of a bayonet lock to connecting parts of the device housing of a filter device as a whole.
  • the filter body 36 has, on its side opposite the end cap 50, a dome-shaped wall part in the form of a half-shell 58, wherein the hemispherical shape in question merges integrally into the rest of the filter wall 34 with the same wall thickness.
  • the support tube body 40 is largely similar to the separating device 14 according to Figure 1, except for the upper dome-shaped wall part 20 of the separating device 14 and in this respect it is also possible, as shown in Figure 1, to remove the filter body 36 obtained by precoating together with the separating device 14 from the tank, so that the filter element 38 according to Figure 5 is then obtained except for the end cap 50.
  • the hollow cylindrical matrix 37 preferably in a fixed connection, comprises the hollow cylindrical part the separation device 16. In this solution, a corresponding separation device 14 would then have to be inserted into the tank 10 for a new separation or precoating process.
  • the filter body 36 according to the illustration in Fig. 2 represents a type of intermediate product for obtaining the filter element 38 according to the illustration in Fig. 8.
  • the upper, dome-shaped wall part 20 is separated by means of a fictitiously indicated separating cut 60 and according to the illustration in Fig. 4, the hollow cylindrical wall part 18 of the filter body 36 remains, with two opposite central openings 52.
  • a correspondingly adapted support tube body 40 with 3-wing geometry can then be inserted and the end of the filter body 36 is provided with two annular end caps 50 with a respective sealing ring 54 in order to complete the filter element 38 as a whole.
  • At least one of the end caps 50 can be provided with opposing wings 56 of a bayonet lock for the purpose of connecting the filter element to the connection points of a filter housing (not shown).
  • a filter element 38 it is possible to design one of the two end caps 50, in particular the lower end cap 50, to be closed, and in this way the lower central opening 52 in the filter body 36 is closed, so that when the flow through the filter element 38 from the outside to the inside and against the supporting effect of the support tube body 40, the discharge of a filtrate flow takes place exclusively via the upper annular end cap 50.
  • a filter element according to Figs. 11 to 13 largely corresponds to the embodiment according to the illustration in Figs. 8 to 10; only the relevant filter body 36 is made of fiber material surrounded by an additional filter medium 62 which, contrary to the illustrations, can also be pleated instead of a hollow cylindrical structure.
  • the filter medium 62 in question can then primarily serve to separate particle contamination from a fluid flow, whereas the inner filter body 36 serves as a filter medium for cleaning off so-called varnish, which is not necessarily considered to be particle-contaminated.
  • the additional filter medium is supported on its inner peripheral side by the matrix 37.
  • the inner filter body 36 can serve to dewater a fluid flow, since cellulose material in particular has the property of being able to absorb water.
  • oil-water separation can also take place, provided that a relevant fluid flow is guided through the two-stage filter element 38 from the outside to the inside. Any remaining particulate contamination can then also be cleaned off by the subsequent filter body 36 in addition to the filter medium 62.
  • the filter body 36 made of fiber material also takes over the cleaning of particle contamination from a fluid flow.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Filtering Materials (AREA)

Abstract

L'invention concerne un procédé de fabrication d'un filtre composé de fibres pour un élément filtrant (38), comprenant au moins les étapes de procédé consistant à : - fournir une matrice (37) ; - former une paroi filtrante (34) présentant une épaisseur de paroi progressivement croissante constituée d'un milieu filtrant (35) obtenu par dépôt des fibres à partir d'une suspension dans la matrice (37) ; - arrêter l'opération de dépôt à l'obtention d'un corps filtrant creux (36) constitué du milieu filtrant (35) qui a une épaisseur de paroi pouvant être spécifiée et dans lequel la matrice (37) est au moins partiellement incorporée.
PCT/EP2024/068734 2023-08-08 2024-07-03 Procédé de fabrication d'un filtre Pending WO2025031684A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102023003273.5A DE102023003273A1 (de) 2023-08-08 2023-08-08 Verfahren zum Herstellen eines Filters
DE102023003273.5 2023-08-08

Publications (1)

Publication Number Publication Date
WO2025031684A1 true WO2025031684A1 (fr) 2025-02-13

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ID=91853252

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2024/068734 Pending WO2025031684A1 (fr) 2023-08-08 2024-07-03 Procédé de fabrication d'un filtre

Country Status (2)

Country Link
DE (1) DE102023003273A1 (fr)
WO (1) WO2025031684A1 (fr)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1066480A (en) * 1963-12-05 1967-04-26 Pall Corp Process for preparing filters having a microporous layer attached thereto and product
DE2609211A1 (de) * 1976-03-05 1977-09-08 Ecodyne Corp Verfahren und filter zum entfernen von verunreinigungen aus einer fluessigkeit
DE3332324A1 (de) * 1982-09-09 1984-03-15 Domnick Hunter Filters Ltd., Birtley, Co. Durham Abscheide-filterelement, verfahren zur herstellung eines solchen filterelementes und filtereinrichtung unter verwendung eines solchen filterelementes
DE69624632T2 (de) 1995-07-28 2003-04-03 Denso Corp., Kariya Filterelement und Verfahren zu seiner Herstellung
US20090014378A1 (en) * 1999-11-23 2009-01-15 Pall Corporation Fluid treatment elements
US20170341004A1 (en) 2016-05-25 2017-11-30 Unifrax I Llc Filter element and method for making the same
DE102016013166A1 (de) 2016-11-04 2018-05-09 Hydac Filter Systems Gmbh Filterelement
EP3197585B1 (fr) * 2014-09-24 2019-03-06 BWF Tec GmbH & Co. KG Bougie filtrante à additifs minéraux

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1066480A (en) * 1963-12-05 1967-04-26 Pall Corp Process for preparing filters having a microporous layer attached thereto and product
DE2609211A1 (de) * 1976-03-05 1977-09-08 Ecodyne Corp Verfahren und filter zum entfernen von verunreinigungen aus einer fluessigkeit
DE3332324A1 (de) * 1982-09-09 1984-03-15 Domnick Hunter Filters Ltd., Birtley, Co. Durham Abscheide-filterelement, verfahren zur herstellung eines solchen filterelementes und filtereinrichtung unter verwendung eines solchen filterelementes
DE69624632T2 (de) 1995-07-28 2003-04-03 Denso Corp., Kariya Filterelement und Verfahren zu seiner Herstellung
US20090014378A1 (en) * 1999-11-23 2009-01-15 Pall Corporation Fluid treatment elements
EP3197585B1 (fr) * 2014-09-24 2019-03-06 BWF Tec GmbH & Co. KG Bougie filtrante à additifs minéraux
US20170341004A1 (en) 2016-05-25 2017-11-30 Unifrax I Llc Filter element and method for making the same
DE102016013166A1 (de) 2016-11-04 2018-05-09 Hydac Filter Systems Gmbh Filterelement

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