DE102009006058B3 - Apparatus and method for producing a tubular filter medium - Google Patents

Abstract

A device (14) for producing a tubular filter medium (16, 16a) for filtering fluids, in particular an internal combustion engine, is described. The device (14) comprises at least one nozzle body (34, 36, 38, 40) which is operatively connected to a material delivery means (72, 74, 76, 78). With the material delivery means (72, 74, 76, 78), the nozzle body (34, 36, 38, 40) with a material (42, 44, 46, 48) for at least co-forming the filter medium (16; 16a) are fed. The nozzle body (34, 36, 38, 40) has at least one nozzle opening (58, 60, 62, 64) from which the material (42, 44, 46, 48) can be dispensed. The device (14) further comprises a shaping surface (54) predetermining the tubular shape of the filter medium (16; 16a), on which the material (42, 44, 46, 48) discharged from the at least one nozzle opening (58, 60, 62, 64) ) can be deposited. The nozzle body (34, 36, 38, 40) is rotatably drivable about a rotation axis (50). The mold surface (54) at least partially surrounds the nozzle body (34, 36, 38, 40) such that the material (42, 44, 46, 48) rotates around the nozzle body (34, 36, 38, 40) The axis of rotation (50) can be ejected by the centrifugal force from the nozzle opening (58, 60, 62, 64) and the ejected material (42, 44, 46, 48) on the mold surface (54) with the formation of the filter medium (16; ) can be caught and formed.

Description

Technical area

The The invention relates to a device for producing a tubular filter medium for Filtration of fluids, in particular an internal combustion engine, with at least two nozzle bodies, the are functionally connected to a material delivery, with the nozzle body with fed a material for at least co-forming the filter medium can be and each having at least one nozzle opening, from which the material can be discharged, and with a tube shape of the filter medium predetermining mold surface, on the output from the at least one nozzle opening material can be deposited.

Further The invention relates to a method for producing a tubular filter medium for Filtration of fluids, in particular an internal combustion engine, in which at least one nozzle body with a material fed by means of a material supply is and the material for at least co-forming the filter medium from at least one nozzle opening of the Nozzle body delivered is, and in which the output from the at least one nozzle opening material deposited on a tube shape of the filter medium predetermining mold surface becomes.

State of the art

to Production of market-known tubular filter media for filtration of fluids, especially air, oil, Fuel, which includes filter bags, turns flat different materials such as paper or fleece or combinations made from it. The flat tracks will be in another Process step by folding or embossing in the desired tube shape brought. This creates a connection seam.

From the patent DE 31 31 643 C2 a device and a method for producing flat fiber webs of reinforcing fibers is known, wherein the reinforcing fibers are directed on a hydrodynamic alignment and deposited on a filter surface. From the publication JP 2002-105830 A a device and a method for producing a multilayer product is known, wherein liquid polymer material is conveyed from a rotating nozzle disk, wherein the nozzle disk is arranged within a guide device.

From the patent DE 32 15 810 C2 For example, there is known a method of collecting continuous polymeric filaments wherein the polymeric filaments are centrifugally ejected from spinneret spinnerets rotating at high speed, the filaments being trapped by an annular surface.

From the DE 24 62 881 C2 For example, another method and apparatus for producing a nonwoven thermoplastic fiber fabric in a seamless tubular form is known. Here, melt-spun threads made of thermoplastic material from a spinneret with a plurality of juxtaposed nozzle openings are stretched exclusively by means of a gas stream, torn into non-contiguous pieces and placed on the outer surface of a rotating drum. The case formed hose is pulled axially from the outer surface of the drum and flattened. The gas flow can cause turbulence, which can influence the laying of the threads on the drum.

Of the Invention is based on the object, a method and an apparatus of the type mentioned above in such a way that just as possible low technical effort as robust as possible tubular Filter media for filtering fluids with optimum filter properties controlled, preferably continuously, can be produced.

Disclosure of the invention

This object is achieved in that at least two nozzle body are rotatably driven about a rotational axis and the mold surface at least partially surrounds the nozzle body, such that the material during rotation of the nozzle body about the axis of rotation by the centrifugal force can be ejected from the nozzle openings and the ejected material can be collected and molded on the mold surface for at least Mitbildung the filter medium. In this case, at least two nozzle body independently, in particular with different rotational direction and / or with different rotational speed, driven. For this purpose, advantageously, the nozzle body can be arranged to be driven to rotate about the same or separate rotational axis (s). Cause different directions of rotation,
that flung-out material threads of the different rotary body are inclined or offset to each other, in particular each helically and crossed one above the other pressed against the mold surface, whereby the compound of the materials and the stability of the entire filter medium is improved. Differences in the rotational speed lead to different contact pressures of the materials to the mold surface, so on this way the shaping and adhesion can be positively influenced. Furthermore, this may simply affect the properties of the filter medium, in particular structure and density. Overall, so the device can be optimally designed for the materials used and the desired structure of the filter medium.

Further have according to the invention at least two nozzle bodies different radial expansions, in particular the nozzle openings different distances to Axis of rotation. The variation of the nozzle distances allows further optimization regarding the properties of the filter medium and the used Materials.

Preferably the nozzle opening can be arranged radially on the outside of the nozzle body be.

According to the invention is thus with the device in one step, both the production a seamless tubular Filter medium and its shape possible without a tool change or another device is required. When the nozzle body starts to turn, The material is thrown by the centrifugal force to the outside and forms a dense braid on the radial inside of a filter mold, which forms the filter medium at least with. The filter medium can also be formed only by this one material. The filter shape already gives the desired tube shape for the Filter medium before, without subsequent embossing or folding required is. In this way, a continuous manufacturing process is possible. Out The continuously produced filter medium can continuously filter elements in big Number to be produced. Further, variations of the device be quickly implemented to one filter medium with another Make construction. In particular, for this purpose, the shape and / or the material can be varied. Because no gas, in particular Air, required to remove the material from the nozzle orifices to press but the material is ejected by the centrifugal force of the rotating nozzle body, there is no gas or air turbulence. The structure of the Filter fleece can be specified more precisely than during use of gas / air support. When using initially flow or sprayable materials, especially melted threads, it is also important that these only after the impact on the mold surface Harden. The lower the gas or air turbulence in the space between the Nozzle body and the mold surface is, the lower is the cooling effect on the first Fluid material and the solidification of the material is only instead of on the mold surface, where the melt threads connect at the crossing points and thus a solid network for the Form filter fleece. Furthermore can be due to the use of centrifugal force on a separate gas or Air supply are omitted, which reduces the technical complexity.

at In another advantageous embodiment, the nozzle body can have a Nozzle disk preferably with a plurality of nozzle openings be. A nozzle disk is a simply constructed rotation body, the favorable rotational properties Has. Further, a nozzle disk flat, so that also several nozzle disks space-saving and can be arranged close to each other. With a plurality, preferably on the outer peripheral side of the nozzle body evenly distributed orifices can be a uniformly dense distribution of the material can be achieved on the mold surface.

at In a further advantageous embodiment, the nozzle body can be arranged a driven shaft. About the shaft, the nozzle body can easily be powered by a drive motor that saves space especially outside the filter shape can be located.

at a further advantageous embodiment can at least two nozzle bodies with separate Material supply means, in particular a container and / or an extruder, for different Materials be connected. In this way, in a single operation different materials be applied in a predetermined order on the mold surface. So can in particular a material for forming a scaffold, a material for the production a filter fleece and a material for bonding and impregnation of the Filter fleece with respective nozzle bodies in a single step sequentially flung onto the mold surface become. In appropriate containers can the materials are stored in sufficient quantities. With a Extruder can granular or powdery material, in particular Thermoplastic, plasticized and in a homogeneous material flow be promoted to the appropriate nozzle body, with the material melt is thrown to the mold surface.

Advantageously, the at least one material may comprise a suspension comprising fibers of paper and / or nonwoven, ceramic and / or glass particles, a phenolic resin and / or a thermoplastic or a mixture of a plurality of said materials. Optionally, these materials can be atomized optimally with the nozzle bodies as a melt or spun off in the form of threads. A suspension with fibers of paper and / or non-woven, ceramic and / or glass particles is easy to produce and with it a filter fleece can be realized with optimum filter properties. Phe nolharz is optimally suitable for impregnating the filter fleece. With cured thermoplastic, a simple and stable support structure can be formed.

advantageously, the at least one nozzle body for Formation of a scaffold, in particular a thermoplastic framework, be educated. This way, already during the molding process a support structure be integrated into the filter medium, allowing later equipment the filter medium, in particular with a filter center pipe not is required. If necessary, to the integrated support structure Even filter end discs are simply glued or welded.

Further can advantageously a plurality of nozzle openings a nozzle body and / or the nozzle openings several nozzle body different Have cross sections and / or hole sizes. Variations of these parameters have a favorable effect on the desired Structure and density of the filter medium. So can the device also optimally adapted to the material (s) used. For each Material and the desired Property of the filter medium can chosen the appropriate parameters become.

at a further advantageous embodiment, a conveyor be provided with the formed on the mold surface filter medium in particular with a variably predeterminable conveying speed relative to the nozzle body axially transported to the axis of rotation can be. In this way is a continuous production of the hose-shaped Filter medium possible. Furthermore, with the conveyor a movement are generated axially to the axis of rotation, which to a total helical Distribution of spun material on the mold surface leads. This in particular has a favorable effect on the stability of the filter medium. In particular, in conjunction with oppositely rotating rotating bodies so creates a dense and stable network of intersecting threads become. The conveyor For this purpose, it can have a stripping device with which the filter medium pulled in the direction of the axis of rotation along the mold surface can be. In this way, the shape itself does not have to be moved, so that in particular a continuous production and promotion the filter medium is easy to implement. Alternatively, the advancement of the filter medium, the mold surface with the filter medium relative to the nozzle body in the direction of the axis of rotation to be moved. For this purpose, the mold surface in particular as the inside an endless tube which is guided over rollers, which dictate the shape of the filter medium. That way too complex tube shapes, especially with alternating diameters realizable.

at In another advantageous embodiment, the profile the mold surface perpendicular to the axis of rotation at least partially round, oval or angular, in particular star-shaped, be, the mold surface can be formed in particular by the inside of a hollow cylinder be. Fil termedien with such profiles have optimal filter properties and are robust. Hollow cylinders are easy to implement and save space built up.

Further can the mold surface in the conveying direction of the filter medium taper. So the filter medium during Peel off the filter surface without further tools and / or a further process step radially compressed For example, to a filter medium with a star-shaped profile to achieve a tighter folding, which then by welding with corresponding end plates can be maintained.

All in all can by variations of the nozzle pulley diameter and / or the rotational speed of the different nozzle disks and / or the use different hole diameter for the nozzle openings and / or different Materials per nozzle body as well a variation of the conveying speed the filter medium in particular the properties of the filter medium be greatly influenced in terms of filter design and density.

The technical problem is inventively further solved in that at least two nozzle bodies around a rotation axis are rotationally driven, wherein the material by the centrifugal force from the nozzle openings is ejected and on the mold surface, the nozzle body radially to the Rotary axis at least partially surrounds, at least Mitbildung the filter medium is collected and shaped.

According to the invention are therefore the production of the filter medium and the shaping in one step summarized. On a separate gas / air supply can be omitted which reduces the technical effort. In addition, any air / gas turbulence avoided, so that the structure of the filter fabric to be produced better can be controlled and a cooling of hurled Material is largely prevented already in the flight phase.

Furthermore, advantageously, the filter medium formed on the mold surface, in particular at a variable speed relative to the nozzle body, can be conveyed axially relative to the axis of rotation in order to produce a continuous production pro to enable stress.

Brief description of the drawings

Further Advantages, features and details of the invention will become apparent the following description, in the embodiments of the invention closer to the drawing explained become. The person skilled in the art will read the drawings in the description and the claims expediently also consider individually in combination and summarize to meaningful further combinations. Show it

1 schematically a plant for the continuous production of individual tubular filters for filtering fluids with a device for producing a filter bag;

2 schematically a detailed view of the device for producing the filter tube from the 1 ;

3 schematically a section of a wall of a with the device of the 1 and 2 manufactured filter bag;

4 schematically a cross section of a filter tube with a round profile, with the device of the 1 and 2 can be produced;

5 schematically a cross section of a filter tube with a star-shaped profile, as with the device of the 1 and 2 can be made using a star-shaped filter mold.

Embodiment (s) the invention

In 1 is an overall reference numeral 10 provided plant for the continuous production of individual tubular filters 12 shown. The filters 12 serve for the filtration of fluids such as air, oil or fuel of an internal combustion engine.

The attachment 10 includes a device 14 for producing a filter tube 16 , The device 14 is in the 1 left and in detail in the 2 shown. In conveying direction, which in the 1 and 2 through arrows 18 indicated behind the device 14 , in 1 So right there is a stove 20 arranged with the filter tube 16 , In particular, an impregnation of the same, is cured. With a winding device 22 that are in the conveying direction 18 behind the stove 20 is the filter tube 16 through the oven 20 through the device 14 pulled and one in the conveying direction 18 following cutting device 24 for cutting the filter tube 16 in individual tubular filter elements 26 fed. A conveyor belt 28 for conveying the filter elements 26 connects an output of the cutting device 24 with a in the conveying direction 18 subsequent welding device 30 , With the welding device 30 be on the front sides of the filter elements 26 endplates 32 appropriate. Some such end discs 32 are exemplary in the 1 indicated. The finished filters 12 consisting of one filter element each 26 with two end discs 32 can in the conveying direction 18 behind the welding device 30 be removed.

The device 14 for the production of the filter tube 16 includes four in the 2 shown nozzle disks 34 . 36 . 38 and 40 with which different materials 42 . 44 . 46 and 48 for forming the filter tube 16 be delivered. The nozzle disks 34 . 36 . 38 and 40 are coaxial with a common axis of rotation 50 in the 2 indicated by dashed lines, arranged and are driven in rotation.

The nozzle disks 34 . 36 . 38 and 40 are located inside a to the axis of rotation 50 Coaxial hollow cylinder of a filter shape 52 forms. The inside of the hollow cylinder realizes the shape of the filter tube 16 predetermining mold surface 54 ,

In the 4 is the profile of one with the device 14 produced round filter tube 16 shown.

In the 5 is the profile of a star-shaped filter tube 16a shown with the device 14 from the 1 and 2 using a conveying direction 18 tapered mold surface can be made with a star-shaped profile. The arrows 56 to the center of the filter bag 16a indicate a compression, as by the tapered mold surface when removing the filter bag 16a is caused. The compression causes a narrower folding of the filter bag 16a by welding to the end discs 32 is maintained.

The mold surface 54 surrounds the nozzle discs 34 . 36 . 38 and 40 radial to the axis of rotation 50 , such that the materials 42 . 44 . 46 and 48 when rotating the nozzle discs 34 . 36 . 38 and 40 around the axis of rotation 50 by the centrifugal force from nozzle openings 58 . 60 . 62 and 64 the nozzle disks 34 . 36 . 38 and 40 be ejected without air turbulence and cooling by air controlled to the mold surface 54 fly and on the form surface 54 for forming the filter tube 16 caught and shaped in an exact structure the. The mold surface 54 Cooling effect on the collected materials 42 . 44 . 46 and 48 so that they can harden. Especially for maintenance purposes or to replace the nozzle discs 34 . 36 . 38 and 40 and / or the filter shape 52 can the nozzle discs 34 . 36 . 38 and 40 axially to the axis of rotation 50 relative to the filter shape 52 be moved so that the nozzle discs 34 . 36 . 38 and 40 outside the filter shape 52 are located. Either the nozzle disc system or the filter form 52 or both are moved.

Each of the nozzle disks 34 . 36 . 38 and 40 is via its own fluid line 66 . 68 . 70 and 72 functional with an extruder 72 or a container 74 . 76 and 78 for the different materials 42 . 44 . 46 and 48 connected, which serve as material delivery. Each nozzle disk 34 . 36 . 38 and 40 can do so with a different material 42 . 44 . 46 and 48 for forming the filter tube 16 be fed. The sake of clarity are in the 1 and 2 the courses of the fluid lines 66 . 68 . 70 and 72 only in the area of the container 74 . 76 and 78 and the extruder 72 shown.

The in the conveying direction 18 first, in the 2 left nozzle disk (support structure nozzle disk 34 ) is with the extruder 72 connected, with the thermoplastic as a material 42 plasticized and made so flowable and spun.

The in the conveying direction 18 second nozzle disk (first spinning nozzle disk 36 ) is with the first suspension tank 74 connected to a suspension with paper fibers as a material 44 contains.

The in the conveying direction 18 third nozzle disk (second spinning nozzle disk 38 ) is with the second suspension tank 76 connected, a suspension with ceramic / glass particles as a material 46 contains.

The in the conveying direction 18 fourth, in the 2 right nozzle disk (impregnation nozzle disk 40 ) is with the resin container 78 connected, the phenolic resin as a material 48 contains.

The radial expansions (diameter) of the nozzle disks 34 . 36 . 38 and 40 are different sizes. The support structure nozzle disk 34 has the largest diameter. The diameters of the other nozzle disks 36 . 38 and 40 take with their position in the conveying direction 18 from. The impregnation nozzle disk 40 has the smallest diameter. This causes in particular that in the conveying direction 18 each rear, smaller nozzle discs in the shadow of the front, each larger nozzle discs lie and so can not hurl material into the area of the larger nozzle discs, which could disturb the order and accuracy of the layers.

The nozzle disks 34 . 36 . 38 and 40 are each on its own powered shaft 80 attached, of which in the 1 and 2 for the sake of clarity only one is shown. The waves 80 are coaxial with the axis of rotation 50 arranged and are driven separately from each other. This can be done by means of corresponding motors, not shown, which are outside the filter form 52 can be located. The nozzle disks 34 . 36 . 38 and 40 can be driven in different directions and / or different rotational speed.

Each of the nozzle disks 34 . 36 . 38 and 40 has along its radially outer peripheral side evenly distributed a plurality of nozzle openings 58 . 60 . 62 and 64 on that with the appropriate fluid lines 66 . 68 . 70 and 72 connected and from which the respective materials 42 . 44 . 46 and 48 can be delivered. Due to the different diameter of the nozzle discs 34 . 36 . 38 and 40 so are the respective nozzle openings 58 . 60 . 62 and 64 at different distances to the rotation axis 50 ,

The nozzle openings 58 . 60 . 62 and 64 the different nozzle disks 34 . 36 . 38 and 40 have different hole sizes. Because the nozzle openings 58 . 60 . 62 and 64 By way of example, having round cross-sections, the respective hole sizes with the diameter of the nozzle opening 58 . 60 . 62 and 64 be designated.

The diameters of the nozzle openings 58 the support structure nozzle disk 34 are the biggest. From the nozzle openings 58 be during rotation of the support structure nozzle disk 34 thick threads of thermoplastic 42 flung out, which with the extruder 72 was melted. The support structure nozzle disk 34 this is done with a comparison with the other nozzle discs 36 . 38 and 40 driven low speed, so that the thick threads on the mold surface 54 settle radially outside as a braid with a coarse structure and harden, with crossing threads stick together by the contact pressure with each other. The coarse thermoplastic structure forms a stable, to a predetermined extent elastic support framework in the cured state 82 for the filter hose 16 to which the end discs 32 can be welded.

The diameters of the nozzle openings 60 and 62 the two spinning nozzle disks 36 and 38 are the same size and smaller than those of the support structure nozzle disk 34 , From the nozzle openings 60 and 62 become during the rotation of the spinning nozzle disks 36 and 38 very thin threads from the ent speaking suspensions with paper fibers 44 relationship, ceramic / glass particles 46 thrown out. The threads are made with paper fibers 44 radially outside and the filaments with ceramic / glass particles 46 stored radially inside. The two spinning nozzle disks 36 and 38 be at a higher speed than the support structure nozzle disk 34 driven, so that the very thin threads as a very fine structure on the mold surface 54 settle and each a dense network 84 and 86 made of filter material. Crossing threads stick together by the contact pressure with each other and with the thermoplastic scaffold 82 and harden on the mold surface 54 out.

The diameters of the nozzle openings 64 the impregnation nozzle disk 40 are the smallest. With the nozzle openings 64 becomes phenolic resin 48 for impregnation of the scaffold 82 and the braids 84 and 86 sputtered from filter material and to the mold surface 54 spun. For this purpose, the impregnation nozzle disk 40 driven at high speed to allow the phenolic resin 48 with a very fine structure on the mold surface 54 in the free areas between the structures of the scaffold 82 and the braids 84 and 86 distributed.

Overall, therefore, the dimension of the nozzle discs 34 . 36 . 38 and 40 , the speeds, the holes and the materials 42 . 44 . 46 and 48 on the function of the respective material 42 . 44 . 46 and 48 in the finished filter tube 16 Voted.

With the winding device 22 becomes the on the mold surface 54 formed cooled and hardened filter bag 16 along the mold surface 54 relative to the nozzle disks 34 . 36 . 38 and 40 in the direction of the axis of rotation 50 permanently out of the filter form 52 drawn. The conveying speed of the filter bag 16 relative to the nozzle disks 34 . 36 . 38 and 40 can do this with the rewinder 22 can be specified variably. The axial movement of the filter tube 16 superimposed with the circular motion of the nozzle discs 34 . 36 . 38 and 40 and causes the threads on the mold surface 54 spun materials 42 . 44 and 46 in the wall of the filter bag 16 each helical, as shown in the 2 is shown.

3 shows the section of a wall of the filter bag 16 Using the device 2 is made. Below is the radially outer peripheral side, along which the scaffold 82 made of thermoplastic 42 extends. In the middle is the dense network 84 from threads with paper fibers 44 that with the first spinning nozzle disk 36 were spun on. In 3 above is the radially inner peripheral side of the filter bag 16 shown the dense network 86 made of threads with ceramic / glass particles 46 that with the second spinning nozzle disk 38 was spun on. The scaffold 82 and the two braids 84 and 86 are with the phenolic resin 48 impregnated with the impregnation nozzle disk 40 was spun on. All the structures 82 . 84 and 86 penetrating phenolic resin 48 is in the 3 indicated by a sloping bar.

In the embodiment of a device described above 14 for producing a filter tube 16 ; 16a and a facility 10 for the continuous production of filters 12 Among others, the following modifications are possible:
The device 14 can also be more or less than four partially even the same or different nozzle discs 34 . 36 . 38 and 40 include.

Instead of the nozzle disks 34 . 36 . 38 and 40 It is also possible to provide different, preferably rotationally symmetrical nozzle bodies, for example cylinders, which have a distribution of nozzle openings 58 . 60 . 62 and 64 can also have in the axial direction. A single nozzle body can also nozzle openings 58 . 60 . 62 and 64 for different materials 42 . 44 . 46 and 48 have, so that only a single nozzle body for all materials is required.

There may also be several nozzle disks 34 . 36 . 38 and 40 be connected to a common material delivery means, so that a material can be deposited in different layers, in particular with different density and / or structure.

One or more of the nozzle disks 34 . 36 . 38 and 40 can also have only a single nozzle opening.

An alternative mold surface may be the nozzle disks 34 . 36 . 38 and 40 radial to the axis of rotation 50 also only partially surrounded, so that left open in the formation of the filter tube in this openings.

Instead of the filter hose 16 ; 16a along the mold surface 54 can subtract the mold surface 54 also together with the filter hose 16 ; 16a relative to the nozzle disks 34 . 36 . 38 and 40 in the direction of the axis of rotation 50 to be moved. For this purpose, for example, an endless tube can be used, the inside of the mold surface 54 forms and is deflected by appropriate shaping roles.

The profile of the mold surface 54 radial to the axis of rotation 50 can also be oval or otherwise polygonal instead of round or star-shaped. The profile can be in the direction of the axis of rotation 50 also be varying.

The nozzle openings 58 . 60 . 62 and 64 the nozzle disks 34 . 36 . 38 and 40 Instead of round cross sections, they can also have different shapes and different cross sections.

Also Each of the nozzle disks can have nozzle orifices have different cross-sections and / or hole sizes.

Instead of the rewinder 22 a conveyor may in particular be provided with a different removal device, with which the on the mold surface 54 formed filter tube 16 ; 16a relative to the nozzle disks 34 . 36 . 38 and 40 axially to the axis of rotation 50 can be transported.

Instead of a suspension with paper or ceramic / glass particles, thermoplastic or Phenolic resin can also other materials or material mixtures, for example two-, three- or multi-component materials are used, the flown and flingable can be made For example, suspensions with other nonwovens, and in the cured state the desired filtering, impregnating and / or supporting Feature.

Claims (13)

Contraption ( 14 ) for the production of a tubular filter medium ( 16 ; 16a ) for filtering fluids, in particular an internal combustion engine, with - at least two nozzle bodies ( 34 . 36 . 38 . 40 ), which functionally with a material delivery ( 72 . 74 . 76 . 78 ), with which the nozzle bodies ( 34 . 36 . 38 . 40 ) with a material ( 42 . 44 . 46 . 48 ) for at least co-forming the filter medium ( 16 ; 16a ) can be fed, and the at least one nozzle opening ( 58 . 60 . 62 . 64 ), from which the material ( 42 . 44 . 46 . 48 ), - one the tube shape of the filter medium ( 16 ; 16a ) predetermining mold surface ( 54 ), on which the from the nozzle openings ( 58 . 60 . 62 . 64 ) delivered material ( 42 . 44 . 46 . 48 ), characterized in that the nozzle bodies ( 34 . 36 . 38 . 40 ) about a rotation axis ( 50 ) are rotationally drivable and the mold surface ( 54 ) the nozzle bodies ( 34 . 36 . 38 . 40 ) at least partially surrounds, such that the material ( 42 . 44 . 46 . 48 ) when rotating the nozzle body ( 34 . 36 . 38 . 40 ) around the axis of rotation ( 50 ) by the centrifugal force from the nozzle openings ( 58 . 60 . 62 . 64 ) can be thrown out and the ejected material ( 42 . 44 . 46 . 48 ) on the mold surface ( 54 ) for at least the formation of the filter medium ( 16 ; 16a ) can be collected and formed, wherein at least two nozzle body ( 34 . 36 . 38 . 40 ) are independently drivable, in particular with different rotational direction and / or with different rotational speed, and different radial expansions, in particular the nozzle openings ( 58 . 60 . 62 . 64 ) different distances to the axis of rotation ( 50 ), to have. Apparatus according to claim 1, characterized in that the nozzle body is a nozzle disc ( 34 . 36 . 38 . 40 ), preferably with a plurality of nozzle openings ( 58 . 60 . 62 . 64 ) are. Device according to claim 1 or 2, characterized in that the nozzle bodies ( 34 . 36 . 38 . 40 ) on a driven shaft ( 80 ) are arranged. Device according to one of the preceding claims, characterized in that at least two nozzle bodies ( 34 . 36 . 38 . 40 ) with separate material supply means, in particular with a container ( 74 . 76 . 78 ) and / or an extruder ( 72 ), for different materials ( 42 . 44 . 46 . 48 ) are connected. Device according to one of the preceding claims, characterized in that the at least one material ( 42 . 44 . 46 . 48 ) a suspension with fibers of paper ( 44 ) and / or nonwoven fabric, ceramic and / or glass particles ( 46 ), a phenolic resin ( 48 ) and / or a thermoplastic ( 42 ) or a mixture of several of said materials. Device according to one of the preceding claims, characterized in that the nozzle bodies ( 34 . 36 . 38 . 40 ) to form a scaffold ( 82 ), in particular a thermoplastic framework, are formed. Device according to one of the preceding claims, characterized in that a plurality of nozzle openings of a nozzle body and / or the nozzle openings ( 58 . 60 . 62 . 64 ) of several nozzle bodies ( 34 . 36 . 38 . 40 ) have different cross sections and / or hole sizes. Device according to one of the preceding claims, characterized in that a conveyor ( 22 ) is provided, with which the on the mold surface ( 54 ) formed filter medium ( 16 ; 16a ) in particular with a variably predeterminable conveying speed relative to the nozzle bodies ( 34 . 36 . 38 . 40 ) axially of the axis of rotation ( 50 ). Device according to one of the preceding claims, characterized in that the profile of the mold surface ( 54 ) perpendicular to the axis of rotation ( 50 ) is at least partially round, oval or angular, in particular star-shaped, in particular the mold surface ( 54 ) through the inside of a hollow cylinder ( 52 ) is formed with. Apparatus according to claim 8, characterized in that the mold surface in the conveying direction of the filter medium ( 16 ; 16a ) tapers. Device according to one of the preceding claims, further comprising a cutting device ( 24 ) for cutting the tubular filter medium ( 16 ; 16a ) into individual filter elements ( 26 ) and a connection device ( 30 ) for attaching end plates ( 32 ) to the filter elements ( 26 ). Method for producing a tubular filter medium ( 16 ; 16a ) for filtering fluids, in particular an internal combustion engine, in which - at least two nozzle bodies ( 34 . 36 . 38 . 40 ) with a material ( 42 . 44 . 46 . 48 ) by means of a material delivery means ( 72 . 74 . 76 . 78 ) and the material ( 42 . 44 . 46 . 48 ) for at least co-forming the filter medium ( 16 ; 16a ) each of at least one nozzle opening ( 58 . 60 . 62 . 64 ) the nozzle body ( 34 . 36 . 38 . 40 ) is discharged, - from the nozzle openings ( 58 . 60 . 62 . 64 ) delivered material ( 42 . 44 . 46 . 48 ) on one of the tube shape of the filter medium ( 16 ; 16a ) predetermining mold surface ( 54 ) is deposited, characterized in that the nozzle body ( 34 . 36 . 38 . 40 ) different radial dimensions, in particular the nozzle openings ( 58 . 60 . 62 . 64 ) different distances to the axis of rotation ( 50 ), and around a rotation axis ( 50 ) are driven in rotation, wherein the material ( 42 . 44 . 46 . 48 ) by the centrifugal force from the nozzle openings ( 58 . 60 . 62 . 64 ) is ejected and on the mold surface ( 54 ), which the nozzle body ( 34 . 36 . 38 . 40 ) radially to the axis of rotation ( 50 ) at least partially surrounds at least the formation of the filter medium ( 16 ; 16a ) is collected and formed, wherein at least two nozzle body ( 34 . 36 . 38 . 40 ) are driven independently, in particular with different rotational direction and / or with different rotational speed. A method according to claim 12, characterized in that on the mold surface ( 54 ) co-formed filter medium ( 16 ; 16a ), in particular with a variable speed relative to the nozzle bodies ( 34 . 36 . 38 . 40 ) axially of the axis of rotation ( 50 ).