Filter element, interior space air filter and method of manufacture

Abstract

The invention relates to a filter element (1) comprising a pleated pack (2) made of a sawtooth-folded filter material (3) and a gas-permeable frame element (5C, 14B, 15B, 16B) which is arranged at the pleated pack (2) and at least partially surrounds the pleated pack (2) and projects laterally. A frame device (17) is fixed at the frame element (5C, 14B, 15B, 16B), wherein the frame device (17) is embodied as a plastic injection-molded part which is injection molded onto the laterally projecting frame element (5C, 14B, 15B, 16B).

Description

TECHNICAL FIELD

[0001] The invention relates to a filter element. Furthermore, the invention relates to an interior space air filter with such a filter element. Furthermore, the invention also relates to a filter assembly.

[0002] Although applicable to any filter element and filter assembly, the invention and the problems underlying it are explained in the following with regard to an interior space filter for a motor vehicle.

[0003] The increasing air pollution, especially in large cities, in combination with the use of modern air conditioning devices, makes it necessary to clean the air introduced from the outside into the interior space of a motor vehicle and processed or conditioned by means of suitable filters. For this purpose, for example, particle filters, odor filters or combinations thereof can be considered, which should filter out or adsorb as well as possible the suspended matter, particles and odors contained in the ambient air.

[0004] For filtering the air for the interior space of a motor vehicle, folded or pleated filter material is often used, like for example filter nonwovens which form a folded pack. For this purpose, a planar filter material web is first of all zigzag-folded. The folded pack is held for example by side straps and head straps or other frames. Such a filter element can be fastened in a replaceable manner in a filter receptacle. The filter assembly thus formed can be installed in the air conditioning device of the respective motor vehicle. BACKGROUND

[0005] A filter element is known from WO 2018 / 050367, in which a plastic frame is arranged around a folded pack with laterally protruding tabs. On the tabs, a circumferential seal is formed. DE 102016217459 A1 discloses a filter element in which a frame is formed which is fixed in a form-locking manner on the folded pack and its folded profiles and folded edges.

[0006] Furthermore, a filter element is known from DE 102019102172 A1, which has a folded bellows on which a circumferential, gas-tight plastic frame is injection molded. The plastic frame has a circumferential radial protrusion on which a seal is arranged. SUMMARY

[0007] Against this background, it is the task of the invention to provide an improved filter element.

[0008] The application therefore proposes a filter element having a folded pack made of sawtooth-folded filter material and a gas-permeable frame element which is arranged at the folded pack and at least partially surrounds the folded pack and projects laterally. A frame device is fixed on the frame element. Here, the frame device is embodied as an injection-molded part which is injection-molded onto the laterally projecting frame element.

[0009] Unlike the known filter elements having an injection-molded frame device, in the filter element according to the application the surrounding frame element onto which the frame device is injection-molded is formed from a gas-permeable material. The filter element according to the application can therefore be referred to as a hybrid filter element which combines the technology of a plastic injection-molded filter element and a filter element having a conventional frame element structure, in particular in the form of a top side and side bands made of nonwoven fabric, as is common in the field of interior space filters for automobiles. This has the advantage that production costs can be reduced since the injection-molding tool required for this is constructed less expensively and, in addition, provides the possibility of providing more and / or more closely arranged folds (Falten). This is advantageous in particular in embodiments in which HEPA filter media are used in the folded pack, which are generally comparatively thin.

[0010] Furthermore, a method for producing a filter element is proposed, wherein at the folded pack made of sawtooth-folded filter material a frame element is arranged which at least partially surrounds the folded pack and projects laterally. Furthermore, a frame device is injection-molded onto the laterally projecting frame element in an injection-molding process.

[0011] For the proposed filter element, onto which the frame device is injection-molded onto the laterally projecting frame element by means of an injection-molding process or injection-molding method, the filter element can be easily produced and requires only few further structural elements as basic components in addition to the folded pack, such as the frame element.

[0012] Furthermore, an interior space air filter is proposed with such a filter element.

[0013] In an embodiment of the filter element, the frame element is a section which projects laterally beyond the width and / or height of the folded pack. The height of the folded pack results from the height of the folds (Faltung) from which the sawtooth-folded filter material is formed. The width of the folded pack generally extends along the respective fold edge.

[0014] The frame element can also be a projecting section of a side band which is arranged on a folded profile of the folded pack. It is also conceivable that the frame element is a section of a head band which is arranged on an end fold section of the folded pack and projects laterally beyond the length and / or height of the folded pack. The length of the folded pack generally results in the machine direction or transversely to the fold edges of the folded pack.

[0015] In an embodiment, the frame element is a section of the side end folded section which protrudes laterally beyond the length and / or height of the folded pack.

[0016] In this regard, the frame element can be made, in particular, of the same material as the filter material. The filter properties of the side or head band do not necessarily have to be the same filter properties as the filter material.

[0017] In an embodiment, the side band and / or head band has an L-shaped profile, wherein the shorter section or side edge corresponds to the respective protruding section. By means of the protruding section, the frame device can be cost-advantageously shaped to the folded pack located in the interior of the respective frame.

[0018] In an embodiment, the protruding section and / or the frame device protrudes laterally beyond the height of the folded pack from the folded pack. Here, the frame element can protrude laterally and beyond the height of the folded pack obliquely. Thereby, the injection molding of the frame device onto the frame element is facilitated.

[0019] In an embodiment, the frame device is fixed on the frame element only by means of an injection-molded encapsulation. Preferably, the frame device is not configured to be injection molded directly on the folded edges and / or folded profile of the folded pack. Thereby, the filter area is optimized, since the material of the frame device does not cover the filter material. In this regard, it is preferred in an embodiment that the frame device does not connect or contact the filter material folded in a zigzag.

[0020] Furthermore, in a preferred embodiment, the frame element can have or be made of a nonwoven material, wherein the nonwoven material is, in particular, a spunbond nonwoven which preferably has synthetic fibers at least partially.

[0021] The air permeability of the nonwoven material of the frame element at 200 Pa can be between 200 and 3500 l / m 2 s, preferably between 400 and 1800 l / m 2 s. Alternatively or additionally, the nonwoven material of the frame element can have a thickness of 1 to 6 mm and / or a weight per area of 100 to 500 g / m 2 , preferably 230 to 290 g / m 2 .

[0022] In a variant of the manufacturing method, the frame element is clamped in the injection molding tool on a separating contour of the injection molding tool such that no material of the frame device reaches directly the folded edges and / or folded profile of the folded pack during the injection molding.

[0023] In an embodiment, the frame elements are configured strip-like, band-like and / or planar along the longitudinal sides and / or the broad sides of the folded pack. The frame elements can be made, for example, of a nonwoven material like a side band or a head band.

[0024] In an embodiment, the frame arrangement comprises a folded pack in the form of a frame and is configured for a radial sealing along a flow-through direction through the folded pack. The folded pack can be configured, for example, square, wherein the flow-through direction is considered generally transverse to the machine direction and transverse to the orientation of the folded edges.

[0025] In an embodiment, the frame elements have a band-like region in the transition region to the side band sections, the head band sections and / or the end fold sections corresponding to the height of the folded pack, which band-like region is free of the injection-molded material of the frame arrangement.

[0026] In this regard, it can be ensured that no material of the frame arrangement reaches directly the filter material or the folded pack. The respective strip-like region in the transition region can be achieved at the time of manufacture by clamping between two parts along a separating contour of the injection-molding tool.

[0027] Furthermore, a filter assembly with a filter housing and a filter element is proposed, as explained before or below. The filter element can be at least partially accommodated in the filter housing, and the frame arrangement is clamped axially by the housing separation line in the flow-through direction. In particular, by the lateral extension of the frame arrangement, an axial sealing can be easily achieved by a suitable sealing geometry of the frame arrangement.

[0028] The filter element comprises, for example, a filter material and one or more stabilizing elements, in particular in the form of side bands and / or head bands (also referred to as end bands), which stabilize the filter material at least section-wise in order to maintain the shape of the filter material, in particular in the filter operation. The stabilizing elements, in particular the side bands and the head bands, can constitute a closed or open frame, which surrounds the filter material, or can be material-integrally formed. The filter element for the folded pack preferably comprises two head bands and two side bands, which are connected in particular material-lockingly to the folded pack and frame-like surround the folded pack as frame elements. The side bands and the head bands are formed, for example, of a filter fabric, a filter mesh or a filter nonwoven.

[0029] The filter material can be folded or configured in a corrugated manner. As a fold, for example, a zigzag fold or a W-fold is known. The filter material can be embossed and subsequently folded sharply on the embossed edges with the folds configured. A planar material filter web deformed accordingly can be used as a starting material. The filter material is, for example, a filter fabric, a filter mesh mat or a filter nonwoven. In particular, the filter material can be produced in a spunbond nonwoven process or a meltblown process. Furthermore, the filter medium can be felted or needle punched. The filter material can have natural fibers, such as cotton, or artificial fibers made of, for example, polyester, polyphenylene sulfide or polytetrafluoroethylene. The fibers can be oriented along, oblique to and / or transverse to the machine direction when processed.

[0030] The filter material can be single-layered or multi-layered. The filter material can also have a sorbent, such as activated carbon. Furthermore, the filter material can have an antibacterial and / or antiallergenic effect. As an antibacterial material, for example, zinc-pyridinone or nanosilver is considered, as an antiallergenic material, for example, polyphenols are considered.

[0031] The respective filter element serves for filtering a fluid, i.e. a gaseous and / or liquid medium, for example air. Gaseous media or air here also include gas- or air-solid mixtures and / or gas- or air-liquid mixtures. For example, an air conditioning device can have a filter element.

[0032] In particular, the open filter material can be provided for removing particles of test dust A4 according to ISO 12103-1 from an air flow having a filter velocity of 0.10 to 0.30 m / s relative to the filter medium area in the case of an air permeability of greater than 3000 l / m 2 s (determined according to ISO 9237 at 200 Pa). The acquisition of the filter characteristic values can take place, for example, according to DIN 71460-1.

[0033] In particular, the highly separating filter material can be provided for removing particles of test dust A2 according to ISO 12103-1 and NaCI aerosol particles according to DIN 71460-1 from an air flow having a filter velocity of 0.10 to 0.30 m / s relative to the filter medium area in the case of an air permeability of greater than 350 l / m 2 s (determined according to ISO 9237 at 200 Pa). The acquisition of the filter characteristic values can take place, for example, according to DIN 71460-1.

[0034] In an embodiment, the filter material is produced as a synthetic medium having a multi-layer structure. The filter material preferably has a grammage of 50-150 g / m 2 . The filter material preferably corresponds to the efficiency class E10-H14 according to DIN EN 1822-3 in the text submitted on the filing date of the present application.

[0035] In a variant, the folding distance is less than 5 mm. It is conceivable that the filter element is embodied as a HEPA filter. The material thickness of the filter material is for example between 0.2 mm and 1 mm.

[0036] In an embodiment, the frame device is formed from a frame material comprising a thermoplastic elastomer material. In particular, in the context of the date of the present application, elastomers according to ISO 18064 can be considered, for example rubber materials, TPE, PUR, foamed polymers and other suitable sealing materials.

[0037] The frame device can have a seal which seals the unclean side assigned to the filter element against the clean side. The seal can be the same component as the frame device manufactured in an injection-molding process. Alternatively, the seal can be configured as an additional component. Thus, the seal can for example be placed on the frame material. A two-part embodiment of the frame device can also be considered. Then, a hard inner frame region provides the transition to the frame element, while a soft outer region is used for sealing.

[0038] Furthermore, a filter element manufactured according to the aforementioned method is proposed.

[0039] The filter element or the filter assembly can be applied in passenger cars, trucks, construction machines, ships, rail vehicles, aircraft and generally in air-conditioning technology, in particular in heating-air-conditioning devices, in household appliances, in fuel cells or in building technology. These motor vehicles or vehicles can be operated electrically and / or with the aid of fuel, in particular gasoline or diesel. With regard to building technology, stationary devices for processing air can in particular be considered.

[0040] Furthermore, the present application also relates to a vehicle having such a filter assembly.

[0041] The features explained with regard to the filter element apply accordingly to the interior space air filter, the filter assembly and the vehicle, and vice versa.

[0042] Further possible refinements of the application also include combinations of features or method steps described previously or subsequently with regard to the embodiments which are not explicitly mentioned. Here, the person skilled in the art can also add individual aspects as improvements or supplements to the respective basic form of the application.

[0043] Further design options of the application are the subject matter of the dependent claims and the embodiments described below of the application. The application is explained in detail below with the aid of embodiments with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0044] Herein are shown:

[0045] Figure 1 schematic view of a general motor vehicle with an interior space air filter is shown;

[0046] Figure 2 a perspective view of a filter material is shown;

[0047] Figure 3 a schematic view of a folded pack according to an embodiment is shown;

[0048] Figure 4 a schematic view of a filter element according to an embodiment is shown in a top view;

[0049] Figure 5 a cross section A-A of Figure 4 is shown;

[0050] Figure 6 a side view of a pattern with edge sides in Figure 4 is shown;

[0051] Figure 7 an enlarged cut-out portion (Ausschnitt) Z in Figure 6 is shown;

[0052] Figure 8 a schematic cut-out portion of an injection mold for manufacturing a filter element of Figures 4-7 is shown. DETAILED DESCRIPTION

[0053] Figure 1 A motor vehicle 100 with an air conditioning device is shown, which comprises a filter assembly 10. The air conditioning device can be configured as a heating-air conditioning device, for example. The air conditioning device or the filter assembly 10 takes in outside air 11 and supplies filtered air 12 to a driver's cabin 13 (also referred to as passenger compartment) of the motor vehicle 100. The filtering is achieved via a filter element 1 configured as an interior space air filter.

[0054] Figure 2 A folded filter material 3 is shown isolated and can be referred to as a folded pack 2 in the form shown. The filter material 3 is a filter nonwoven, a filter fabric, a filter mesh mat or a filter felt, in particular a needle felt, for example. In particular, the filter material 3 can be manufactured in a meltblown process. The filter material 3 can have natural fibers, such as cotton, or artificial fibers made of polyester, polyphenylene sulfide or polytetrafluoroethylene, for example. The fibers can be oriented along, inclined to and / or transverse to the machine direction M upon processing. The fibers can also be stretched in one spatial direction. The filter material 3 can be configured as single-layered or multi-layered.

[0055] To form the pleated package 2, the filter material 3 includes pleats 6, which typically extend transversely to the machine direction M. The pleated filter material 3 is also referred to as a pleat. The pleats 6 can be created by folding along sharp fold edges 7, 8 (also referred to as fold tips) or by a corrugated embodiment of the filter material 3. It can be seen in... Figure 2 The folded edge 7 is located at the top and can be seen in Figure 2 The folded edge 8 is located on the lower side of the orientation. The corresponding fold 6 can be defined by two adjacent folded sections 5, which are connected to each other by the corresponding folded edge 8. The fold is implemented as a serrated fold. In this respect, a serrated fold profile 4, 9 is formed on the side of the folded package 2.

[0056] The following type of fold is also feasible, in which the fold 6 has a varying height H. Furthermore, the fold spacing C between the fold 6 or adjacent fold edges 7 and 8 with the same fold orientation can vary. The filter material 3 can be designed to be self-supporting, meaning that the fold 6 maintains its shape stability during the prescribed flow through the filter in operation.

[0057] The filter material 3 is defined in the machine direction M by end fold sections 5A and 5B. Laterally, the filter material 3 is defined by lateral folded end edges (also called folded profiles 4 and 9). "Folded end edge" refers to the lateral edge of the filter material 3 on one side of the folded package 2, which extends between adjacent folded edges 7 and 8 of the corresponding folded portion 6.

[0058] The filter material 3 can have a rectangular shape in the top view, that is, in plane E extending from its plane. However, triangular, pentagonal or polygonal, circular or elliptical shapes are also acceptable.

[0059] exist Figure 2 The diagram shows the length L of the folded bag 2 along the machine direction M and transverse to the folding edges 7 and 8. The width B of the folded bag 2 is typically given along the folding edges 7 and 8 and transverse to the machine direction M.

[0060] In order to manufacture filter elements, such as internal air filter elements, in Figure 2 The folded bag 2 shown in the image has a surrounding frame element. Figure 3 The text is a jumbled mess of characters and symbols, making it impossible to translate accurately. It appears to be a corrupted or incomplete Figure 2 The folded bag 2 shown has a folded edge 7 on the upper side. Side straps 14 and 15 are attached to folding profiles 4 and 9. Side straps 14 and 15 each have L-shaped profiles with strap sections 14A and 15A and laterally extending side legs 14B and 15B, which are, for example, glued to the folding profiles 4 and 9. The laterally extending side strap sections or side legs 14B and 15B are part of the frame element. Figure 2The vertical side legs 14A and 15A in the orientation correspond to the height H of the folded bag 2.

[0061] On the side of the head, Figure 3 The folded bag 2 is oriented forward and to the right, and is closed by a head strap 16. The head strap includes a section or side leg 16A corresponding to the height H of the folded bag 2, and laterally extending side legs 16B. On the head section of the folded bag 2 opposite to the head strap 16, this head section... Figure 3 As shown in the upper left of the orientation, the end folding section 5A has an extended side leg 5C that extends beyond the height H and length L of the folded package 2. The side leg 5C is separated from the end folding section 5A by the folding edge.

[0062] The corresponding sections 5C, 14B, 15B, and 16B, protruding beyond height H, have a width b, which allows for a strong bond with the injection-molded material during the subsequent injection molding process. In this regard, Figure 3 A folded bag 2 is shown, on which a frame element is formed that protrudes laterally from the folded bag 2. The frame element is formed here by four protruding segments 5C, 14B, 15B and 16B.

[0063] As in Figure 4 As shown, the frame assembly 17 is formed onto the protruding sections 5C, 14B, 15B, and 16B. The frame assembly 17 is shown in a top view of the constructed filter element 1. Figure 4 The middle part is wider than the width B of folded bag 2 and longer than the length L of folded bag 2 within its lateral extension range. Figure 4 In the illustration, the protruding sections 5C, 14B, 15B, and 16B within the frame assembly 17 are encapsulated or surrounded by the material of the frame assembly 17 by injection molding.

[0064] In addition, Figure 4 In the embodiment, the filter element 1 shows two folded edges parallel to the length of the filter element 1 applied to the upper part and adhesive marks 18 on the folded section therebetween. These adhesive marks are formed, for example, by a thermal adhesive material. The adhesive marks 18 stabilize the fold spacing and, for example, penetrate into the fold.

[0065] exist Figure 5 , 6 Other illustrations of filter element 1 are shown in Figures 7 and 8. Figure 5 Cross-sectional view AA is shown. Figure 5 Side strip sections 14A and 15A and their protruding sections 14B and 15B can be seen. The protruding sections 14B and 15B function as frame elements. Figure 5 The orientation is tilted upwards and laterally away from the direction of folded bag 2. Figure 5In the middle, the cross-sectional profile of the frame arrangement 17 can be seen from the left and right, wherein the frame elements or the projecting sections 14B, 15B are enclosed. Furthermore, the adhesive trace 18, for example made of hot adhesive, and the lower folding edge 8 are shown in the middle.

[0066] Figure 6 A view of the filter element 1 is shown transversely to the cross-sectional direction A-A and looking towards the side strap 14. On the left, a pattern Z of a release folding profile 4 is shown. Furthermore, the head strap 16A can be seen on the left. Figure 7 An enlarged view of the cutout section Z is shown. Figure 6 It can be seen that the frame arrangement 17 is injection molded onto the section 16B during the injection molding process. Here, the frame arrangement 17 comprises, in the orientation of the filter element 1, Figure 7 a left axial sealing section 17B and a fixing section 17A, into which the projecting section 16B or the part of the frame element 16B is enclosed. Similarly, not shown projecting sections are fixed to the frame arrangement 17 along the length of the filter element.

[0067] Here, the frame arrangement 17 neither touches the folding edge nor the material section of the filter element 1 below the height H of the fold. The design of the frame or frame arrangement 17 prevents the filter area from being lost due to the injection-molded material of the frame 17. In the orientation of the filter element 1, Figure 5 , 6 and 7, the flow-through direction S through the filter element is realized from top to bottom.

[0068] In the filter assembly, the filter element 1 is accommodated in a housing. Figure 7 A part of the housing with an upper housing section 24 and a lower housing section 25 is shown. Between these two sections 24, 25 is the separation line or separation profile of the housing 24, 25. In the mounted state of the filter element 1, the sealing section 17B of the frame arrangement 17 is enclosed or axially clamped on the separation profile 26, 27 of the housing. Thereby, a reliable seal between the raw fluid area and the pure fluid area of the resulting filter assembly is ensured.

[0069] In the manufacturing method of the filter element 1, the frame arrangement 17 is produced during the injection molding process, in particular using an injection molding tool. Figure 8 Now an enlarged view of a cutout section of a schematic drawing of an injection mold or injection molding tool 19, 20 for manufacturing a filter element 1 as described before is shown. In the orientation of the filter element 1, Figure 8 on the right, only the sections 14B, 15B or 16B projecting from the folding package are shown inside the cavity 23 of the injection molding tool 19, 20 for the sake of clarity. Furthermore, in the orientation of the filter element 1, Figure 8 a part of the sections 14A, 15A or 16A corresponding to the height of the folding package can be seen vertically.

[0070] In the transition area between the vertical section 14A, 15A, 16A of the side or head strap and the respective protruding section 14B, 15B or 16B, the material of the side or head strap is clamped by the two tool parts 19, 20. This takes place along the separation contour 22 of the injection molding tool. In Figure 8 another separation contour 21 is shown to the left of the cavity 23.

[0071] The injection molding tool or tool lower part 19 and tool upper part 20 are pressed against each other along the separation contour 21, 22 with clamping of the protruding section 14B, 15B, 16B. The injection of the plastic material forming the frame device 17 then takes place. After the injection molding material has hardened, the frame device 17 is produced from this material with a suitable sealing contour, avoiding contamination by folding (see Figure 7 ).

[0072] In order to improve the sealing properties in the radial, but also in the axial direction, a two-component injection molding method can also be used. In summary, the proposed production method enables a simple production of the filter element, in particular for use in interior space air filters.

[0073] List of reference signs

[0074] 1 filter element / interior space air filter

[0075] 2 folding package

[0076] 3 filter material

[0077] 4 folding profile

[0078] 5 folding section

[0079] 5A, 5B end folding section

[0080] 5C frame element

[0081] 6 folding part

[0082] 7, 8 folding edge

[0083] 9 folding profile

[0084] 10 filter device

[0085] 11 uncleaned air

[0086] 12 filtered air

[0087] 13 driver's cab

[0088] 14 (14A, 14B) side strap

[0089] 15 (15A, 15B) side strap

[0090] 14B, 15B frame elements

[0091] 16 (16A, 16B) headgear

[0092] 17 frame arrangement

[0093] 17A securing section

[0094] 17B sealing section

[0095] 26, 27 split profiles

[0096] 18 adhesive trace

[0097] 19, 20 injection molding tool

[0098] 21, 22 tool split

[0099] 23 cavity

[0100] 24, 25 housing parts

[0101] 100 vehicle

[0102] b overhang

[0103] B width

[0104] C folding pitch

[0105] E plane

[0106] H height

[0107] L length

[0108] M machine direction

[0109] S through-flow direction

Claims

1. A filter element (1) comprising a pleated pouch (2) made of a serrated pleated filter material (3), a breathable frame element (5C, 14B, 15B, 16B) disposed at the pleated pouch (2) and at least partially surrounding the pleated pouch (2) and extending laterally, and a frame device (17) fixed at the frame element (5C, 14B, 15B, 16B), wherein, The frame assembly (17) is implemented as a plastic injection molded part onto a laterally extending frame element (5C, 14B, 15B, 16B), wherein the frame element (5C, 14B, 15B, 16B) is a section (14B, 15B) of the side straps (14, 15) on the folding profile (4) of the folding bag (2) that laterally protrudes beyond the width (B) and / or height (H) of the folding bag (2) or a section (16B) of the headband (16) on the end folding section (5A) of the folding bag (2) that laterally protrudes beyond the length (L) and / or height (H) of the folding bag (2).

2. The filter element according to claim 1, wherein, Frame elements (5C, 14B, 15B, 16B), protruding sections and / or frame devices (17) extend laterally beyond the height (H) of the folded package (2).

3. The filter element according to claim 1 or 2, wherein, The frame device (17) is fixed to the frame elements (5C, 14B, 15B, 16B) by injection molding.

4. The filter element according to claim 1 or 2, wherein, The frame elements (5C, 14B, 15B, 16B) comprise or are made of nonwoven fabric material.

5. The filter element according to claim 4, wherein, The nonwoven fabric material of the frame elements (5C, 14B, 15B, 16B): - Breathability at 200 Pa is 200 to 3500 l / m 2 s, and / or - With a thickness between 1 and 6 mm, and / or - With 100 to 500 g / m 2 Weight per unit area.

6. The filter element according to claim 1 or 2, wherein, The frame elements (5C, 14B, 15B, 16B) are constructed in strips, bands and / or planar shapes along the longitudinal and / or wide sides of the folded package (2).

7. The filter element according to claim 1 or 2, wherein, The frame device (17) surrounds the folded package (2) and is configured to provide a radial seal along the flow direction (S).

8. The filter element according to claim 1 or 2, wherein, The frame elements (5C, 14B, 15B, 16B) do not have the injection-molded material of the frame device (17) in the transition areas to the side strap section (14A, 15A), head strap section (16A) and / or the end folding section (5A) corresponding to the height (H) of the folding bag (2).

9. The filter element according to claim 3, wherein, The frame device (17) is not configured to be directly injection molded onto the folded edges (7, 8) and / or folded profiles (4, 9) of the folded bag (2).

10. The filter element according to claim 4, wherein, The nonwoven material is spunbond nonwoven fabric.

11. The filter element according to claim 10, wherein, The spunbond nonwoven fabric has at least some synthetic fibers.

12. The filter element according to claim 5, wherein, The nonwoven fabric material of the frame elements (5C, 14B, 15B, 16B): - Air permeability at 200 Pa is 400 to 1800 l / m 2 s, and / or - With 230 to 290 g / m 2 Weight per unit area.

13. A method for manufacturing a filter element according to any one of claims 1 to 12, wherein, A breathable frame element (5C, 14B, 15B, 16B) that at least partially surrounds the folded bag (2) and extends laterally is placed on the folded bag (2) made of serrated folded filter material (3), and the frame device (17) is injection molded onto the laterally extending frame element (5C, 14B, 15B, 16B) during the injection molding process.

14. The method according to claim 13, wherein, The frame elements (5C, 14B, 15B, 16B) are clamped in the injection tool (19, 20) along the separation profile (22) of the injection tool (19, 20) so that during the injection process, the material without the frame device (17) directly reaches the folded edge (7, 8) and / or folded profile (4, 9) of the folded package (2).

15. A filter assembly (10) having a filter housing (24, 25) and a filter element (1) according to any one of claims 1 to 12, the filter element being at least partially accommodated in the filter housing (24, 25), wherein, The frame device (17) is axially clamped at the shell separation line (26, 27) along the flow direction (S).

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