EP3463614A1 - Method for manufacturing a filter medium, and filter medium - Google Patents

Method for manufacturing a filter medium, and filter medium

Info

Publication number
EP3463614A1
EP3463614A1 EP17730692.5A EP17730692A EP3463614A1 EP 3463614 A1 EP3463614 A1 EP 3463614A1 EP 17730692 A EP17730692 A EP 17730692A EP 3463614 A1 EP3463614 A1 EP 3463614A1
Authority
EP
European Patent Office
Prior art keywords
filter
joining
filter layers
joined together
geometry
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.)
Withdrawn
Application number
EP17730692.5A
Other languages
German (de)
French (fr)
Inventor
Ralf Disson
Hartmut Harr
Hannes LAY
Bernd Neubauer
Birgit Renz
Markus Steppe
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.)
Mahle International GmbH
Original Assignee
Mahle International 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 Mahle International GmbH filed Critical Mahle International GmbH
Publication of EP3463614A1 publication Critical patent/EP3463614A1/en
Withdrawn legal-status Critical Current

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
    • B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
    • B01D39/1607—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous
    • B01D39/1623—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous of synthetic origin
    • B01D39/163—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous of synthetic origin sintered or bonded
    • 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
    • B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
    • B01D39/1607—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous
    • B01D39/1623—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous of synthetic origin
    • 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
    • B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
    • B01D39/18—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being cellulose or derivatives thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B29/00—Layered products comprising a layer of paper or cardboard
    • B32B29/02—Layered products comprising a layer of paper or cardboard next to a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/0076—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised in that the layers are not bonded on the totality of their surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/04—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the partial melting of at least one layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/16—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with all layers existing as coherent layers before laminating
    • B32B37/20—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with all layers existing as coherent layers before laminating involving the assembly of continuous webs only
    • B32B37/203—One or more of the layers being plastic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/05—Interconnection of layers the layers not being connected over the whole surface, e.g. discontinuous connection or patterned connection
    • 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
    • B01D2239/02—Types of fibres, filaments or particles, self-supporting or supported materials
    • B01D2239/025—Types of fibres, filaments or particles, self-supporting or supported materials comprising nanofibres
    • 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
    • B01D2239/0668—The layers being joined by heat or melt-bonding
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/02—2 layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/724—Permeability to gases, adsorption
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/726—Permeability to liquids, absorption
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2317/00—Animal or vegetable based
    • B32B2317/12—Paper, e.g. cardboard

Definitions

  • the invention relates to a method for producing a filter medium and a filter medium which is produced by means of this method.
  • filter systems for filtering fresh air and liquids such as oil, fuel or coolant are needed.
  • contamination with dirt particles or similar To prevent a suitable filter medium is required.
  • Modern filter media generally consist of a plurality of filter layers and have spacer elements, also known to those skilled in the art as so-called "cams.” Said spacer elements ensure that the filter layers are arranged at a distance from one another in some regions. The said spacer elements prevent at an applied fluid pressure to the undesired blocking of the filter folds formed in the filter medium.
  • spacer elements for instance in the form of a groove structure, into already attached filter media takes place either in a further process step or, alternatively, after the joining process and immediately before the joining process. tion of the filter medium.
  • DE 10 2006 062 189 B4 discloses a method for producing a 3-dimensional, facet-structured material web.
  • a material web is provided with a multi-dimensional structuring in a primary production step and provided with depressions and folds.
  • the wells are partially supported on their concave side by each converging to a point of view support elements.
  • a pressure medium is pressed against the concave side of the troughs, and an active medium presses against the convex side of the troughs.
  • the surface quality of the spatially facet-structured material web is retained in this way.
  • the at least two filter layers each have at least one section in which they are not joined together by means of the thermoplastic fibers. This allows a particularly flexible attachment of the at least two filter layers together.
  • At least one first filter layer is provided for carrying out the method, which has a plurality of thermoplastic fibers which are heated before and / or during the joining.
  • the thermoplastic fibers are softened by heating and / or at least partially melted. In this way, a cohesive connection in the form of an adhesive bond can be generated in a simple manner between the first filter layer in the region of the thermoplastic fibers and the second filter layers.
  • the fibers provided in the first filter layer are formed as thermoplastic fibers which can be deformed by means of a heating device.
  • a heating device allows a particularly homogeneous joining process.
  • said heater may be part of a joining tool for joining the two filter layers together.
  • This variant allows heating / heating of the fibers of the first filter layer before and / or during the attachment. nanderfugens using the joining tool. In this way, a particularly good cohesive connection or adhesive bond between the fibers of the first filter layer and the at least one further filter layer is achieved.
  • both filter layers ie both joining partners, have thermoplastic fibers. In this way, a particularly stable connection between the two filter layers can be generated.
  • At least one filter layer may comprise additional, non-thermoplastic fibers. These fibers remain unaffected by the actual joining process and can thus provide improved strength of the at least one filter layer both before and after the joining process.
  • a pressing tool is used as the joining tool for joining the at least two filter layers together.
  • a pressing tool which may comprise rollers acting as pressure rollers, it is possible to press the at least two filter layers together.
  • the at least one first filter layer in the region of its joining zones is connected to the at least one further filter layer.
  • the first filter layer rests only on the second filter layer or, in a preferred embodiment, can also be arranged at a distance from the second filter layer.
  • the joining tool is designed such that in the region between the fibers when joining a predetermined distance geometry is generated.
  • the introduction of a special distance geometry in an additional process step can be omitted in this variant.
  • the at least two filter layers are joined together in one method step and arranged in the same method step in regions at a distance from each other. This measure allows a comparison with conventional methods considerably simplified production of the filter medium with two or more filter layers.
  • At least one, preferably web-like formed, additional joining region can be formed.
  • additional joining region the at least two filter layers are joined together.
  • Such an additional web-like joining area is preferably used to form a filter fold in a further method step.
  • the distance geometry generated by means of the joining train is a sinusoidal or trapezoidal geometry, or, alternatively, a groove-like geometry. All of these geometries have in common that they significantly improve the filter effect of the filter medium.
  • the joining tool comprises an ultrasound source, so that the at least two filter layers are joined together by the action of ultrasound.
  • an ultrasonic source for carrying out the method leads to the generation of a particularly permanent adhesive bond between the filter layers.
  • At least one second filter layer without thermoplastic fibers is provided, which has cellulose, in particular paper, and / or nanofibers as the layer material.
  • Such filter layer without thermoplastic ie by heating / heating fusible fibers, the Based on the aforementioned material systems are particularly easy to the fibers of the first filter layer available or materially, preferably with an adhesive bond, connectable to these.
  • the invention further relates to a filter medium having at least two filter layers, which are preferably produced by means of the method presented above.
  • the advantages explained above in connection with the method according to the invention are therefore also transferred to the filter medium according to the invention.
  • the two filter layers each have at least one portion in which they are not joined together by means of the thermoplastic fibers. This allows a particularly flexible attachment of the at least two filter layers together.
  • the at least two filter layers which are not joined together in the at least one section by means of the thermoplastically deformable fibers, have a predetermined distance geometry.
  • this predetermined distance geometry is a sinusoidal or trapezoidal or groove-like or cam-like geometry.
  • the filter medium is produced using the method according to the method presented above.
  • the above-explained advantages of the production method are therefore also transferred to the filter medium according to the invention.
  • FIG. 1 shows an illustration of the method according to the invention
  • FIG. 2 shows a first example of a filter medium produced by means of the method according to FIG. 1, FIG.
  • FIG. 3 shows a second example of a filter medium produced by means of the method according to FIG. 1,
  • FIG. 4 shows a third example of a filter medium produced by means of the method according to FIG. 1,
  • FIG. 5 shows a fourth example of a filter medium produced by means of the method according to FIG.
  • FIG. 1 shows a first filter layer 2a and a second filter layer 2b, from which a filter medium 1 according to the invention is produced while carrying out the method according to the invention. It is clear that in variants of the example also filter media 1 can be produced with more than just 2 filter layers 2a, 2b.
  • the first filter layer 2 a has a plurality of thermoplastic fibers 5. These thermoplastic fibers 5 are thus fibers which can be plastically deformed by heating by means of a suitable heating device 10.
  • the second filter layer 2b has no thermoplastic fibers and can comprise as layer material cellulose, in particular paper, and / or nanofibers.
  • the first filter layer 2a in addition to the fibers 5 as a layer material cellulose, in particular paper, and / or nanofibers.
  • the second filter layer 2b in a manner analogous to the filter layer 2a, fibers 5 (not shown in Figure 1).
  • the method described here is characterized in that the two filter layers 2a, 2b are joined together in a single, common method step and are arranged in regions at a distance from each other.
  • the joining of the two filter layers 2a, 2b to each other takes place in a plurality of common joining sections 3, which are defined by the position of the joining roller / roller webs.
  • the two filter layers 2a, 2b are arranged in regions 4 between adjacent joining zones 3 at a distance from each other.
  • the plurality of fibers 5 in the first filter layer 2a is heated by means of the heating device 10. With such a heating is a softening and / or at least partially melting of the fibers 5 in the first filter layer 2a accompanied.
  • the first filter layer 2a in the region of the fibers 5, that is to say in the region of the joining zones 3 with the formation of an adhesive bond, that is to say materially bonded can be joined to the second filter layers 2b.
  • the joining of the two filter layers 2a, 2b takes place by means of a joining tool 11, which in the example of FIG. 1 is designed as a pressing tool 12 and comprises two rollers 13a, 13b.
  • a joining tool 11 which in the example of FIG. 1 is designed as a pressing tool 12 and comprises two rollers 13a, 13b.
  • the pressing tool 12 By means of the pressing tool 12, the two filter layers 2 a, 2 b are pressed against one another such that the first filter layer 2 a is pressed in the region of its thermoplastic fibers 5 with the second filter layer 2 b and thus joined together in a material-locking manner. In areas 4 between the fibers 5 of the first filter layer 2a, however, no cohesive connection is formed.
  • the two filter layers 2a, 2b are initially arranged on each other and guided by a rotational movement of the two rollers 13a, 13b along a joining direction R by a space 14 formed between the two rollers 13a, 13b.
  • said intermediate space 14 the actual joining takes place by means of pressing.
  • the heating device 10 may be integrated into the two rollers 13 a, 13 b of the pressing tool 12.
  • the heater 10 may be formed as an electric heater, which is indicated schematically in Figure 1.
  • the heating device 10 is thus part of the joining tool 11.
  • the provision of a separate heating device in the form of a suitable heating furnace is conceivable, which is arranged immediately adjacent to the joining tool 1 1 (not It is also possible to irradiate the two filter layers 2a, 2b by means of heating radiation, so that they are heated as desired before joining them together.
  • the heating device 10 is formed as a radiant heat source, which is also located immediately adjacent to the joining tool 1 1 (not shown).
  • the heating device 1 regardless of their concrete technical realization form, integrated into the in the Fügewerkszug 1 1 and thus part of the joining tool 1 first
  • the rollers 13a, 13b of the pressing tool 12 and the joining tool 1 1 are designed such that in the produced filter medium 1 with the at least two filter layers 2a, 2b in the areas 4 between the fibers 5 when joining a predetermined distance geometry is generated.
  • This may be, for example, a trapezoidal geometry shown in FIG. 2 or a sinusoidal geometry illustrated in FIG.
  • the desired geometry can be determined by appropriate design of the outer peripheral sides 15a, 15b of the two rollers 13a, 13b.
  • sinusoidal or trapezoidal design other geometries are conceivable.
  • additional rollers 18a, 18b at least one, preferably web-like, additional joining region 16 can be formed in the at least two filter layers 2a, 2b.
  • the web-like additional execution area can also be integrated in the roller 15b.
  • a fold (not shown) of the filter medium 1 can later be formed in a further, optional process step.
  • FIG. 4 shows, as a further variant, two filter layers 2a, 2b with cam-like geometry, so that a plurality of cams 6-in the example of FIG. 4, only two such cams 6 are shown as an example-are arranged at a distance from one another.
  • the two filter layers 2 a, 2 b abut each other and are joined together in the region of the cams 6 by means of the thermoplastic fibers 5.
  • the filter layers 2a, 2b are not connected to one another in sections 7 between two cams 6, but lie against one another only.
  • the joint connection in the region of the cams 6 can take place flat over the entire respective cam 6, but also only in a pointwise or in sections over the area of the relevant cam 6.
  • FIG. 5 shows, as a further variant, two filter layers 2 a, 2 b, which are joined to one another by means of a grooving 8.
  • a groove-like geometry can be produced by providing a groove-like structure on the two outer peripheral sides 15a, 15b of the two rollers 13a, 13b.
  • Such so-called creasing rolls provide for the connection of the two filter layers 2a, 2b in the region of the creasing 8.
  • a joining connection does not necessarily have to be produced over the entire surface, but only selectively or in sections, in particular at the vertexes 9a and at the flanks 9b of the creasing 8. This results in a stiff, yet very flow-optimized fiber layer composite.
  • an ultrasonic source can also be used as the joining tool 1 1 as an alternative to the pressing tool 12 explained above.
  • the at least two filter layers 2a, 2b can be joined together in an analogous manner to the above-described use of a pressing tool 12 by ultrasound action and be arranged in regions at a distance from each other.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Filtering Materials (AREA)

Abstract

The invention relates to a method for manufacturing a filter medium (1) comprising at least two filter plies (2a, 2b); according to said method, at least one first filter ply (2a) contains a plurality of thermoplastic fibers (5) by means of which the two filter plies are joined to each other in at least some areas in a single method step.

Description

Verfahren zur Herstellung eines Filtermediunns sowie Filtermedium  Process for producing a filter medium and filter medium
Die Erfindung betrifft ein Verfahren zur Herstellung eines Filtermediums sowie ein Filtermedium, welches mittels dieses Verfahrens hergestellt ist. The invention relates to a method for producing a filter medium and a filter medium which is produced by means of this method.
Für einen verschleißarmen Langzeitbetrieb einer Brennkraftmaschine werden Filtersysteme zum Filtern von Frischluft sowie von Flüssigkeiten wie beispielsweise Öl, Kraftstoff oder Kühlmittel benötigt. Um eine Kontamination genannten Medien mit Schmutzpartikeln o.ä. zu verhindern, ist ein geeignetes Filtermedium erforderlich. Moderne Filtermedien bestehen in der Regel aus mehreren Filterlagen und weisen Abstandselemente, dem einschlägigen Fachmann auch als sogenannte „Nocken" bekannt, auf. Besagte Abstandselemente stellen sicher, dass die Filterlagen bereichsweise im Abstand zueinander angeordnet sind. Auf diese Weise wird eine verbesserte Filterwirkung erzielt. Die besagten Abstandselemente verhindern bei anliegendem Fluiddruck zu dem eine unerwünschte Blockbildung der im Filtermedium ausgebildeten Filterfalten. For a low-wear long-term operation of an internal combustion engine filter systems for filtering fresh air and liquids such as oil, fuel or coolant are needed. To a media called contamination with dirt particles or similar. To prevent a suitable filter medium is required. Modern filter media generally consist of a plurality of filter layers and have spacer elements, also known to those skilled in the art as so-called "cams." Said spacer elements ensure that the filter layers are arranged at a distance from one another in some regions. The said spacer elements prevent at an applied fluid pressure to the undesired blocking of the filter folds formed in the filter medium.
Für die Herstellung besagter Filtermedien existieren vielerlei Herstellungsverfahren. Typischerweise werden zur Herstellung besagten Filtermediums zwei oder mehr Filterlagen aneinandergefügt. Solche herkömmlichen Filtermedien mit zwei oder mehr Filterlagen werden entweder direkt im Herstellungsprozess - zu nennen ist beispielsweise die Herstellung mehrerer„Headboxes" im sog.„Air-Laid" oder Wet-Laid" Prozess - oder in einem nachgeschalteten bzw. Offline-Verfahren aneinander gefügt. There are many manufacturing processes for the production of said filter media. Typically, two or more filter layers are joined together to produce said filter medium. Such conventional filter media with two or more filter layers are either directly in the manufacturing process - to name, for example, the production of several "headboxes" in the so-called "Air-Laid" or Wet-Laid "process - or joined together in a downstream or offline process ,
Das Einprägen von Abstandselementen, etwa in Form einer Rillenstruktur, in bereits aneinandergefügte Filtermedien erfolgt entweder in einem weiteren Prozessschritt, oder, alternativ dazu, nach dem Fügevorgang und unmittelbar vor der Fal- tung des Filtermediums. Auch ein nachträgliches Einbringen besagter Abstandselemente, also nach Faltung des Filtermediums, etwa durch Umspritzen oder Einlegen eines Zusatzbauteils, etwa eines Kammes, ist aus dem Stand der Technik bekannt. The embossing of spacer elements, for instance in the form of a groove structure, into already attached filter media takes place either in a further process step or, alternatively, after the joining process and immediately before the joining process. tion of the filter medium. A subsequent introduction of said spacers, so after folding of the filter medium, such as by encapsulation or inserting an additional component, such as a comb, is known from the prior art.
All die genannten Verfahren sind jedoch mit relativ hohem technischem Aufwand verbunden, was sich nachteilig auf die Herstellungskosten des Filtermediums auswirkt. However, all the above methods are associated with relatively high technical complexity, which adversely affects the cost of manufacturing the filter medium.
Vor diesem Hintergrund offenbart die DE 10 2006 062 189 B4 ein Verfahren zum Herstellen einer 3-dimensionalen, facettenförmig strukturierten Materialbahn. Bei dem Verfahren wird eine Materialbahn in einem primären Herstellungsschritt mit einer mehrdimensionalen Strukturierung ausgestattet und mit Mulden und Falten versehen. Anschließend werden die Mulden auf ihrer konkaven Seite durch jeweils zu einem Standpunkt zusammenlaufende Stützelemente partiell abgestützt. Danach wird in einem weiteren Strukturierungsschritt ein Druckmedium gegen die konkave Seite der Mulden gedrückt, und ein Wirkmedium drückt gegen die konvexe Seite der Mulden. Die Oberflächengüte der räumlich facettenförmig strukturierten Materialbahn bleibt auf diese Weise erhalten. Against this background, DE 10 2006 062 189 B4 discloses a method for producing a 3-dimensional, facet-structured material web. In the method, a material web is provided with a multi-dimensional structuring in a primary production step and provided with depressions and folds. Subsequently, the wells are partially supported on their concave side by each converging to a point of view support elements. Thereafter, in a further structuring step, a pressure medium is pressed against the concave side of the troughs, and an active medium presses against the convex side of the troughs. The surface quality of the spatially facet-structured material web is retained in this way.
Es ist eine Aufgabe der vorliegenden Erfindung, bei einem Herstellungsverfahren zur Herstellung eines Filtermediums mit wenigstens zwei Filterlagen neue Wege aufzuzeigen. It is an object of the present invention, in a manufacturing method for producing a filter medium with at least two filter layers to show new ways.
Diese Aufgabe wird durch den Gegenstand der unabhängigen Patentansprüche gelöst. Bevorzugte Ausführungsformen sind Gegenstand der abhängigen Patentansprüche. Kerngedanke der Erfindung ist demnach, mit Hilfe von thermoplastisch verformbarer Fasern in zumindest einer ersten Filterlage wenigstens zwei Filterlagen abschnittsweise aneinanderzufügen. Dies erlaubt eine gegenüber herkömmlichen Verfahren erheblich vereinfachte Herstellung des Filtermediums. Vorliegend werden die Begriffe "thermoplastisch" und "thermoplastisch verformbar" äquivalent verwendet. This object is solved by the subject matter of the independent patent claims. Preferred embodiments are subject of the dependent claims. The core idea of the invention is accordingly to join together in sections at least two filter layers with the aid of thermoplastically deformable fibers in at least one first filter layer. This allows a comparison with conventional methods considerably simplified production of the filter medium. In the present case, the terms "thermoplastic" and "thermoplastically deformable" are used equivalently.
Bei einer bevorzugten Ausführungsform weisen die wenigstens zwei Filterlagen jeweils wenigstens einen Abschnitt auf, in welchem sie nicht mittels der thermoplastischen Fasern aneinandergefügt werden. Dies gestattet eine besonders flexible Befestigung der wenigstens zwei Filterlagen aneinander. In a preferred embodiment, the at least two filter layers each have at least one section in which they are not joined together by means of the thermoplastic fibers. This allows a particularly flexible attachment of the at least two filter layers together.
Bei einer anderen bevorzugten Ausführungsform wird für die Durchführung des Verfahrens wenigstens eine erste Filterlage bereitgestellt, welche eine Mehrzahl von thermoplastischen Fasern aufweist, die vor und/oder während des Aneinanderfügens erwärmt werden. Die thermoplastischen Fasern werden durch das Erwärmen erweicht und/oder wenigstens teilweise aufgeschmolzen. Auf diese Weise kann auf einfache Weise zwischen der ersten Filterlage im Bereich der thermoplastischen Fasern und der zweiten Filterlagen eine stoffschlüssige Verbindung in Form einer Klebeverbindung erzeugt werden. In another preferred embodiment, at least one first filter layer is provided for carrying out the method, which has a plurality of thermoplastic fibers which are heated before and / or during the joining. The thermoplastic fibers are softened by heating and / or at least partially melted. In this way, a cohesive connection in the form of an adhesive bond can be generated in a simple manner between the first filter layer in the region of the thermoplastic fibers and the second filter layers.
Bei einer vorteilhaften Weiterbildung sind die in der ersten Filterlage vorgesehenen Fasern als thermoplastische Fasern ausgebildet, die mittels einer Heizeinrichtung verformt werden können. Die Verwendung einer Heizeinrichtung ermöglicht einen besonders homogenen Fügeprozess. In an advantageous development, the fibers provided in the first filter layer are formed as thermoplastic fibers which can be deformed by means of a heating device. The use of a heating device allows a particularly homogeneous joining process.
Zweckmäßig kann besagte Heizeinrichtung Teil eines Fügewerkzeugs zum Aneinanderfügen der zwei Filterlagen sein. Diese Variante erlaubt ein Erwärmen/Erhitzen der Fasern der ersten Filterlage vor und/oder während des Anei- nanderfugens mittels des Fügewerkzeugs. Auf diese Weise wird eine besonders gute stoffschlüssige Verbindung bzw. Klebverbindung zwischen den Fasern der ersten Filterlage und der zumindest einen weiteren Filterlage erreicht. Suitably, said heater may be part of a joining tool for joining the two filter layers together. This variant allows heating / heating of the fibers of the first filter layer before and / or during the attachment. nanderfugens using the joining tool. In this way, a particularly good cohesive connection or adhesive bond between the fibers of the first filter layer and the at least one further filter layer is achieved.
Bei einer vorteilhaften Weiterbildung weisen beide Filterlagen, also beide Fügepartner, thermoplastische Fasern auf. Auf diese Weise kann eine besonders stabile Verbindung zwischen den beiden Filterlagen erzeugt werden. In an advantageous development, both filter layers, ie both joining partners, have thermoplastic fibers. In this way, a particularly stable connection between the two filter layers can be generated.
In einer vorteilhaften Weiterbildung kann zumindest eine Filterlage zusätzliche, nicht-thermoplastische Fasern aufweist. Diese Fasern bleiben vom eigentlichen Fügevorgang unberührt und können somit für eine verbesserte Festigkeit der zumindest einen Filterlage sowohl vor als auch nach dem Fügevorgang sorgen. In an advantageous development, at least one filter layer may comprise additional, non-thermoplastic fibers. These fibers remain unaffected by the actual joining process and can thus provide improved strength of the at least one filter layer both before and after the joining process.
Bei einer vorteilhaften Weiterbildung wird als Fügewerkzeug zum Aneinanderfügen der zumindest zwei Filterlagen ein Presswerkzeug verwendet. Mittels eines solchen Presswerkzeugs, welches als Druckwalzen wirkende Rollen umfassen kann, ist es möglich, die zumindest zwei Filterlagen aneinander zu pressen. Auf diese Weise wird die wenigstens eine erste Filterlage im Bereich ihrer Fügezonen, mit der wenigstens einen weiteren Filterlage verbunden. In zu den Fügezonen komplementären Zonen der ersten Filterlage liegt die erste Filterlage hingegen nur auf der zweiten Filterlage auf bzw. kann in einer bevorzugten Ausführungsform auch beabstandet von der zweiten Filterlage angeordnet sein. In an advantageous development, a pressing tool is used as the joining tool for joining the at least two filter layers together. By means of such a pressing tool, which may comprise rollers acting as pressure rollers, it is possible to press the at least two filter layers together. In this way, the at least one first filter layer in the region of its joining zones is connected to the at least one further filter layer. By contrast, in zones of the first filter layer that are complementary to the joining zones, the first filter layer rests only on the second filter layer or, in a preferred embodiment, can also be arranged at a distance from the second filter layer.
Bei einer weiteren vorteilhaften Weiterbildung ist das Fügewerkzeug derart ausgebildet, dass im Bereich zwischen den Fasern beim Aneinanderfügen eine vorbestimmte Abstandsgeometrie erzeugt wird. Die Einbringung einer speziellen Abstandsgeometrie in einem zusätzlichen Verfahrensschritt kann bei dieser Variante entfallen. Bei einer anderen vorteilhaften Weiterbildung werden die wenigstens zwei Filterlagen in einem Verfahrensschritt aneinandergefügt und in demselben Verfahrensschritt bereichsweise im Abstand zueinander angeordnet. Diese Maßnahme erlaubt eine gegenüber herkömmlichen Verfahren erheblich vereinfachte Herstellung des Filtermediums mit zwei oder mehr Filterlagen. In a further advantageous embodiment, the joining tool is designed such that in the region between the fibers when joining a predetermined distance geometry is generated. The introduction of a special distance geometry in an additional process step can be omitted in this variant. In another advantageous development, the at least two filter layers are joined together in one method step and arranged in the same method step in regions at a distance from each other. This measure allows a comparison with conventional methods considerably simplified production of the filter medium with two or more filter layers.
Besonders bevorzugt kann mittels zweier weiterer, zusätzlicher Rollen des Presswerkzeugs in den zumindest zwei Filterlagen zumindest ein, vorzugsweise stegartig ausgebildeter, zusätzlicher Fügebereich ausgebildet werden. In diesem zusätzlichen Fügebereich sind die zumindest zwei Filterlagen aneinandergefügt. Ein solcher zusätzlicher stegartig ausgebildeter Fügebereich wird bevorzugt dazu verwendet, in einem weiteren Verfahrensschritt eine Filterfalte auszubilden. Particularly preferably, by means of two additional, additional rollers of the pressing tool in the at least two filter layers at least one, preferably web-like formed, additional joining region can be formed. In this additional joining region, the at least two filter layers are joined together. Such an additional web-like joining area is preferably used to form a filter fold in a further method step.
Bei einer anderen vorteilhaften Weiterbildung ist die mittels des Fügewerkezugs erzeugte Abstandsgeometrie eine sinus- oder trapezartige Geometrie, oder, alternativ dazu, eine rillenartige Geometrie. All den genannten Geometrien ist gemeinsam, dass sie die Filterwirkung des Filtermediums deutlich verbessern. In another advantageous development, the distance geometry generated by means of the joining train is a sinusoidal or trapezoidal geometry, or, alternatively, a groove-like geometry. All of these geometries have in common that they significantly improve the filter effect of the filter medium.
Bei einer anderen bevorzugten Ausführungsform umfasst das Fügewerkzeug eine Ultraschallquelle, so dass die zumindest zwei Filterlagen durch Ultraschalleinwirkung aneinandergefügt werden. Die Verwendung einer Ultraschallquelle zur Durchführung des Verfahrens führt zur Erzeugung einer besonders dauerhaften Klebverbindung zwischen den Filterlagen. In another preferred embodiment, the joining tool comprises an ultrasound source, so that the at least two filter layers are joined together by the action of ultrasound. The use of an ultrasonic source for carrying out the method leads to the generation of a particularly permanent adhesive bond between the filter layers.
Bei einer weiteren bevorzugten Ausführungsform wird wenigstens eine zweite Filterlage ohne thermoplastische Fasern bereitgestellt, die als Lagenmaterial Cellu- lose, insbesondere Papier, und/oder Nanofasern aufweist. Derartige Filterlage ohne thermoplastische, also durch Erwärmen/Erhitzen schmelzbare Fasern, die auf den vorangehend genannten Materialsystemen basieren, sind besonders einfach an die Fasern der ersten Filterlage fügbar bzw. stoffschlüssig, vorzugsweise mit einer Klebverbindung, mit diesen verbindbar. In a further preferred embodiment, at least one second filter layer without thermoplastic fibers is provided, which has cellulose, in particular paper, and / or nanofibers as the layer material. Such filter layer without thermoplastic, ie by heating / heating fusible fibers, the Based on the aforementioned material systems are particularly easy to the fibers of the first filter layer available or materially, preferably with an adhesive bond, connectable to these.
Die Erfindung betrifft weiterhin ein Filtermedium, welches wenigstens zwei Filterlagen aufweist, die vorzugsweise mittels des vorangehend vorgestellten Verfahrens hergestellt sind. Die vorangehend im Zusammenhang mit dem erfindungsgemäßen Verfahren erläuterten Vorteile übertragen sich daher auch auf das erfindungsgemäße Filtermedium. The invention further relates to a filter medium having at least two filter layers, which are preferably produced by means of the method presented above. The advantages explained above in connection with the method according to the invention are therefore also transferred to the filter medium according to the invention.
Bei einer bevorzugten Ausführungsform weisen die beiden Filterlagen jeweils wenigstens einen Abschnitt auf, in welchem sie nicht mittels der thermoplastischen Fasern aneinandergefügt sind. Dies erlaubt eine besonders flexible Befestigung der wenigstens zwei Filterlagen aneinander. In a preferred embodiment, the two filter layers each have at least one portion in which they are not joined together by means of the thermoplastic fibers. This allows a particularly flexible attachment of the at least two filter layers together.
Zweckmäßig können die zumindest zwei Filterlagen, die in dem wenigstens einem Abschnitt nicht mittels der thermoplastisch verformbaren Fasern aneinandergefügt sind, eine vorbestimmte Abstandsgeometrie besitzen. Bei einer vorteilhaften Weiterbildung ist diese vorbestimmte Abstandsgeometrie eine sinusartige oder trapezartige oder rillenartige oder nockenartige Geometrie. Suitably, the at least two filter layers, which are not joined together in the at least one section by means of the thermoplastically deformable fibers, have a predetermined distance geometry. In an advantageous development, this predetermined distance geometry is a sinusoidal or trapezoidal or groove-like or cam-like geometry.
Bei einer weiteren bevorzugten Ausführungsform ist das Filtermedium unter Anwendung des Verfahrens nach dem vorangehend vorgestellten Verfahren hergestellt. Die voranstehend erläuterten Vorteile des Herstellungsverfahrens übertragen sich somit auch auf das erfindungsgemäße Filtermedium. In a further preferred embodiment, the filter medium is produced using the method according to the method presented above. The above-explained advantages of the production method are therefore also transferred to the filter medium according to the invention.
Weitere wichtige Merkmale und Vorteile der Erfindung ergeben sich aus den Unteransprüchen, aus der Zeichnung und aus der zugehörigen Figurenbeschreibung anhand der Zeichnung. Es versteht sich, dass die vorstehend genannten und die nachstehend noch zu erläuternden Merkmale nicht nur in der jeweils angegebenen Kombination, sondern auch in anderen Kombinationen oder in Alleinstellung verwendbar sind, ohne den Rahmen der vorliegenden Erfindung zu verlassen. Other important features and advantages of the invention will become apparent from the dependent claims, from the drawing and from the associated description of the figures with reference to the drawing. It is understood that the features mentioned above and those yet to be explained below can be used not only in the particular combination given, but also in other combinations or in isolation, without departing from the scope of the present invention.
Bevorzugte Ausführungsbeispiele der Erfindung sind in den Zeichnungen dargestellt und werden in der nachfolgenden Beschreibung näher erläutert, wobei sich gleiche Bezugszeichen auf gleiche oder ähnliche oder funktional gleiche Komponenten beziehen. Preferred embodiments of the invention are illustrated in the drawings and will be described in more detail in the following description, wherein like reference numerals refer to the same or similar or functionally identical components.
Es zeigen, jeweils schematisch: It show, each schematically:
Fig. 1 eine das erfindungsgemäße Verfahren erläuternde Darstellung, FIG. 1 shows an illustration of the method according to the invention, FIG.
Fig. 2 ein erstes Beispiel eines mittels des Verfahrens gemäß Figur 1 hergestellten Filtermediums, FIG. 2 shows a first example of a filter medium produced by means of the method according to FIG. 1, FIG.
Fig. 3 ein zweites Beispiel eines mittels des Verfahrens gemäß Figur 1 hergestellten Filtermediums, 3 shows a second example of a filter medium produced by means of the method according to FIG. 1,
Fig. 4 ein drittes Beispiel eines mittels des Verfahrens gemäß Figur 1 hergestellten Filtermediums, 4 shows a third example of a filter medium produced by means of the method according to FIG. 1,
Fig. 5 ein viertes Beispiel eines mittels des Verfahrens gemäß Figur 1 hergestellten Filtermediums. Inn Folgenden wird anhand der Darstellung der Figur 1 beispielhaft die Durchführung des erfindungsgemäßen Verfahrens erläutert. Die Figur 1 zeigt eine erste Filterlage 2a und eine zweite Filterlage 2b, aus welchen unter Durchführung des erfindungsgemäßen Verfahrens ein erfindungsgemäßes Filtermedium 1 hergestellt wird. Es ist klar, dass in Varianten des Beispiels auch Filtermedien 1 mit mehr als nur 2 Filterlagen 2a, 2b hergestellt werden können. 5 shows a fourth example of a filter medium produced by means of the method according to FIG. The following is an example of the implementation of the method according to the invention is explained with reference to the illustration of Figure 1. FIG. 1 shows a first filter layer 2a and a second filter layer 2b, from which a filter medium 1 according to the invention is produced while carrying out the method according to the invention. It is clear that in variants of the example also filter media 1 can be produced with more than just 2 filter layers 2a, 2b.
Wie die Figur 1 erkennen lässt, weist die erste Filterlage 2a eine Mehrzahl von thermoplastischen Fasern 5 auf. Bei diesen thermoplastischen Fasern 5 handelt es sich also um Fasern, die mittels einer geeigneten Heizeinrichtung 10 durch Erwärmen plastisch verformt werden können. Die zweite Filterlage 2b besitzt hingegen keine thermoplastischen Fasern und kann als Lagenmaterial Cellulose, insbesondere Papier, und/oder Nanofasern aufweisen. Auch die erste Filterlage 2a kann neben den Fasern 5 als Lagenmaterial Cellulose, insbesondere Papier, und/oder Nanofasern aufweisen. In einer Variante kann auch die zweite Filterlage 2b, in analoger Weise zur Filterlage 2a, Fasern 5 aufweisen (in Figur 1 nicht gezeigt). As can be seen from FIG. 1, the first filter layer 2 a has a plurality of thermoplastic fibers 5. These thermoplastic fibers 5 are thus fibers which can be plastically deformed by heating by means of a suitable heating device 10. On the other hand, the second filter layer 2b has no thermoplastic fibers and can comprise as layer material cellulose, in particular paper, and / or nanofibers. Also, the first filter layer 2a, in addition to the fibers 5 as a layer material cellulose, in particular paper, and / or nanofibers. In a variant, the second filter layer 2b, in a manner analogous to the filter layer 2a, fibers 5 (not shown in Figure 1).
Das vorliegend beschriebene Verfahren zeichnet sich dadurch aus, dass die beiden Filterlagen 2a, 2b in einem einzigen, gemeinsamen Verfahrensschritt aneinandergefügt und dabei bereichsweise im Abstand zueinander angeordnet werden. Mit anderen Worten, das aneinander Fügen der beiden Filterlagen 2a, 2b aneinander erfolgt in mehreren, gemeinsamen Fügeabschnitten 3, welche durch die Position der Fügerolle/Walzenstege festgelegt sind. The method described here is characterized in that the two filter layers 2a, 2b are joined together in a single, common method step and are arranged in regions at a distance from each other. In other words, the joining of the two filter layers 2a, 2b to each other takes place in a plurality of common joining sections 3, which are defined by the position of the joining roller / roller webs.
Demgegenüber werden die beiden Filterlagen 2a, 2b in Bereichen 4 zwischen benachbarten Fügezonen 3 im Abstand zueinander angeordnet. Zum Aneinanderfügen der beiden Filterlagen 2a, 2b wird die Mehrzahl der Fasern 5 in der ersten Filterlage 2a mittels der Heizeinrichtung 10 erwärmt. Mit einem solchen Erwärmen geht ein Erweichen und/oder wenigstens teilweise Aufschmelzen der Fasern 5 in der ersten Filterlage 2a einher. Auf diese Weise kann die erste Filterlage 2a im Bereich der Fasern 5, also im Bereich der Fügezonen 3 unter Ausbildung einer Klebeverbindung, also stoffschlüssig, an die zweite Filterlagen 2b gefügt werden. In contrast, the two filter layers 2a, 2b are arranged in regions 4 between adjacent joining zones 3 at a distance from each other. For joining the two filter layers 2a, 2b, the plurality of fibers 5 in the first filter layer 2a is heated by means of the heating device 10. With such a heating is a softening and / or at least partially melting of the fibers 5 in the first filter layer 2a accompanied. In this way, the first filter layer 2a in the region of the fibers 5, that is to say in the region of the joining zones 3 with the formation of an adhesive bond, that is to say materially bonded, can be joined to the second filter layers 2b.
Das Aneinanderfügen der beiden Filterlagen 2a, 2b erfolgt mithilfe eines Fügewerkzeugs 1 1 , welches im Beispiel der Figur 1 als Presswerkzeug 12 ausgebildet ist und zwei Rollen 13a, 13 b umfasst. Mittels des Presswerkzeugs 12 werden die beiden Filterlagen 2a, 2b derart aneinander gedrückt, dass die erste Filterlage 2a im Bereich ihrer thermoplastischen Fasern 5 mit der zweiten Filterlage 2b ver- presst und somit stoffschlüssig aneinandergefügt wird. In Bereichen 4 zwischen den Fasern 5 der ersten Filterlage 2a wird hingegen keine stoffschlüssige Verbindung ausgebildet. The joining of the two filter layers 2a, 2b takes place by means of a joining tool 11, which in the example of FIG. 1 is designed as a pressing tool 12 and comprises two rollers 13a, 13b. By means of the pressing tool 12, the two filter layers 2 a, 2 b are pressed against one another such that the first filter layer 2 a is pressed in the region of its thermoplastic fibers 5 with the second filter layer 2 b and thus joined together in a material-locking manner. In areas 4 between the fibers 5 of the first filter layer 2a, however, no cohesive connection is formed.
Zum Aneinanderfügen bzw. miteinander Verkleben werden die beiden Filterlagen 2a, 2b zunächst aufeinander angeordnet und mittels einer Drehbewegung der beiden Rollen 13a, 13b entlang einer Fügerichtung R durch einen zwischen den beiden Rollen 13 a, 13b gebildeten Zwischenraum 14 geführt. In besagtem Zwischenraum 14 erfolgt das eigentliche Aneinanderfügen mittels Pressens. For joining or gluing together, the two filter layers 2a, 2b are initially arranged on each other and guided by a rotational movement of the two rollers 13a, 13b along a joining direction R by a space 14 formed between the two rollers 13a, 13b. In said intermediate space 14, the actual joining takes place by means of pressing.
In einer Variante des Beispiels ist es auch denkbar, die beiden Rollen 13a, 13b entgegen der Fügerichtung R entlang einer Rollrichtung R' zu rollen. In a variant of the example, it is also conceivable to roll the two rollers 13a, 13b counter to the joining direction R along a rolling direction R '.
Die Heizeinrichtung 10 kann in die beiden Rollen 13a, 13b des Presswerkzeugs 12 integriert sein. Die Heizeinrichtung 10 kann als elektrische Heizeinrichtung ausgebildet sein, was in Figur 1 schematisch angedeutet ist. In diesem Fall ist die Heizeinrichtung 10 also Teil des Fügewerkzeugs 1 1 . Alternativ ist aber auch die Bereitstellung einer separaten Heizeinrichtung in Form eines geeigneten Heizofen denkbar, der unmittelbar benachbart zum Fügewerkzeug 1 1 angeordnet ist (nicht gezeigt).Vorstellbar ist weiterhin eine Bestrahlung der beiden Filterlagen 2a, 2b mittels Heizstrahlung, sodass diese wie gewünscht vor dem Aneinanderfügen erwärmt werden. In diesem Fall ist die Heizeinrichtung 10 als Heizstrahlungsquelle ausgebildet, die ebenfalls unmittelbar benachbart zum Fügewerkzeug 1 1 angeordnet ist (nicht gezeigt). Bevorzugt ist also die Heizeinrichtung 1 1 , unabhängig von ihrer konkreten technischen Realisierungsform, in das in das Fügewerkezug 1 1 integriert und somit Teil des Fügewerkzeugs 1 1 . Die ortsnahe Bereitstellung der Heizeinrichtung 10 direkt am Fügewerkzeug 1 1 , im Beispiel der Figur 1 also an den Rollen 13a, 13b des Presswerkzeugs 12, ermöglicht eine besonders effektive Erwärmung der Fasern 5 der ersten und oder zweiten Filterlage 2a, 2b. Insbesondere wird sichergestellt, dass auch direkt beim Fügevorgang die zum Aneinanderfügen bzw. Verkleben erforderliche erhöhte Temperatur im Bereich der Fügezonen 3 bereitgestellt wird. The heating device 10 may be integrated into the two rollers 13 a, 13 b of the pressing tool 12. The heater 10 may be formed as an electric heater, which is indicated schematically in Figure 1. In this case, the heating device 10 is thus part of the joining tool 11. Alternatively, however, the provision of a separate heating device in the form of a suitable heating furnace is conceivable, which is arranged immediately adjacent to the joining tool 1 1 (not It is also possible to irradiate the two filter layers 2a, 2b by means of heating radiation, so that they are heated as desired before joining them together. In this case, the heating device 10 is formed as a radiant heat source, which is also located immediately adjacent to the joining tool 1 1 (not shown). Preferably, therefore, the heating device 1 1, regardless of their concrete technical realization form, integrated into the in the Fügewerkszug 1 1 and thus part of the joining tool 1 first The local provision of the heating device 10 directly on the joining tool 1 1, in the example of Figure 1 thus on the rollers 13 a, 13 b of the pressing tool 12, allows a particularly effective heating of the fibers 5 of the first and or second filter layer 2 a, 2 b. In particular, it is ensured that the increased temperature in the region of the joining zones 3 required for joining or gluing is also provided directly during the joining process.
Die Rollen 13a, 13b des Presswerkzeugs 12 bzw. des Fügewerkzeugs 1 1 sind derart ausgebildet, dass in dem erzeugten Filtermedium 1 mit den wenigstens zwei Filterlagen 2a, 2b in den Bereichen 4 zwischen den Fasern 5 beim Aneinanderfügen eine vorbestimmte Abstandsgeometrie erzeugt wird. The rollers 13a, 13b of the pressing tool 12 and the joining tool 1 1 are designed such that in the produced filter medium 1 with the at least two filter layers 2a, 2b in the areas 4 between the fibers 5 when joining a predetermined distance geometry is generated.
Dies kann beispielsweise eine in Figur 2 dargestellte, trapezartige Geometrie o- der eine in Figur 3 dargestellte, sinusartige Geometrie sein. Die gewünschte Geometrie kann durch entsprechende Ausbildung der Außenumfangsseiten 15a, 15b der beiden Rollen 13a, 13b festgelegt werden. Neben der vorangehend erwähnten sinusartigen bzw. trapezartigen Ausbildung sind auch andere Geometrien denkbar. This may be, for example, a trapezoidal geometry shown in FIG. 2 or a sinusoidal geometry illustrated in FIG. The desired geometry can be determined by appropriate design of the outer peripheral sides 15a, 15b of the two rollers 13a, 13b. In addition to the aforementioned sinusoidal or trapezoidal design, other geometries are conceivable.
Mittels zweier weiterer, zusätzlicher Rollen 18a, 18b kann in den zumindest zwei Filterlagen 2a, 2b zumindest ein, vorzugsweise stegartig ausgebildeter, zusätzlicher Fügebereich 16 ausgebildet werden. In einer bevorzugten Ausführungsform kann der stegartige zusätzliche Ausführungsbereich auch in der Rolle 15b integriert sein. In dem zusätzlichen Fügebereich 16, kann später in einem weiteren, optionalen Verfahrensschritt eine Falte (nicht gezeigt) des Filtermediums 1 ausgebildet werden. By means of two further, additional rollers 18a, 18b, at least one, preferably web-like, additional joining region 16 can be formed in the at least two filter layers 2a, 2b. In a preferred embodiment the web-like additional execution area can also be integrated in the roller 15b. In the additional joining region 16, a fold (not shown) of the filter medium 1 can later be formed in a further, optional process step.
Figur 4 zeigt als weitere Variante zwei Filterlagen 2a, 2b mit nockenartiger Geometrie, so dass mehrere Nocken 6 - im Beispiel der Figur 4 sind exemplarisch nur zwei solche Nocken 6 gezeigt - im Abstand zueinander angeordnet sind. Im Bereich der Nocken 6 liegen die beiden Filterlagen 2a, 2b aneinander an und sind im Bereich der Nocken 6 mittels der thermoplastischen Fasern 5 aneinandergefügt. Demgegenüber sind die Filterlagen 2a, 2b in Abschnitten 7 zwischen zwei Nocken 6 nicht miteinander verbunden, sondern liegen nur aneinander an. Die Fügeverbindung im Bereich der Nocken 6 kann flächig über die gesamte jeweilige Nocke 6, aber auch nur punktartig oder abschnittsweise über den Bereich der betreffenden Nocke 6 erfolgen. FIG. 4 shows, as a further variant, two filter layers 2a, 2b with cam-like geometry, so that a plurality of cams 6-in the example of FIG. 4, only two such cams 6 are shown as an example-are arranged at a distance from one another. In the region of the cams 6, the two filter layers 2 a, 2 b abut each other and are joined together in the region of the cams 6 by means of the thermoplastic fibers 5. In contrast, the filter layers 2a, 2b are not connected to one another in sections 7 between two cams 6, but lie against one another only. The joint connection in the region of the cams 6 can take place flat over the entire respective cam 6, but also only in a pointwise or in sections over the area of the relevant cam 6.
Figur 5 zeigt als weitere Variante zwei Filterlagen 2a, 2b, welche mittels einer Rillierung 8 aneinander gefügt werden. Eine solche rillenartige Geometrie kann erzeugt werden, indem auf den beiden Außenumfangsseiten 15a, 15b der beiden Rollen 13a, 13b eine rillenartige Struktur bereitgestellt wird. Solche sogenannte Rillierwalzen sorgen für die Verbindung der beiden Filterlagen 2a, 2b im Bereich der Rillierung 8. Dabei muss nicht notwendigerweise über die gesamte Fläche eine Fügeverbindung erzeugt werden, sondern nur punktuell oder bereichsweise, insbesondere an den Scheitelpunkten 9a und an den Flanken 9b der Rillierung 8. Hierdurch entsteht ein steifes und dennoch sehr strömungsoptimierter Faserlagenverbund. Die Faltung des späteren Faltensterns kann um 90° gedreht zur Rillierung 8 erfolgen. In einer in den Figuren nicht näher dargestellten Variante kann als Fügewerkzeug 1 1 alternativ zum vorangehend erläuterten Presswerkzeug 12 auch eine Ultraschallquelle verwendet werden. Mittels einer solchen Ultraschallquelle können die zumindest zwei Filterlagen 2a, 2b in analoger Weise zur oben beschriebenen Verwendung eines Presswerkzeugs 12 durch Ultraschalleinwirkung aneinandergefügt und bereichsweise im Abstand zueinander angeordnet werden. FIG. 5 shows, as a further variant, two filter layers 2 a, 2 b, which are joined to one another by means of a grooving 8. Such a groove-like geometry can be produced by providing a groove-like structure on the two outer peripheral sides 15a, 15b of the two rollers 13a, 13b. Such so-called creasing rolls provide for the connection of the two filter layers 2a, 2b in the region of the creasing 8. In this case, a joining connection does not necessarily have to be produced over the entire surface, but only selectively or in sections, in particular at the vertexes 9a and at the flanks 9b of the creasing 8. This results in a stiff, yet very flow-optimized fiber layer composite. The folding of the later folding star can be rotated by 90 ° for grooving 8. In a variant not shown in detail in the figures, an ultrasonic source can also be used as the joining tool 1 1 as an alternative to the pressing tool 12 explained above. By means of such an ultrasound source, the at least two filter layers 2a, 2b can be joined together in an analogous manner to the above-described use of a pressing tool 12 by ultrasound action and be arranged in regions at a distance from each other.

Claims

Ansprüche Expectations
1 . Verfahren zum Herstellen eines Filtermediums (1 ) mit wenigstens zwei Filterlagen (2a, 2b), 1 . Method for producing a filter medium (1) with at least two filter layers (2a, 2b),
gemäß welchem zumindest eine erste Filterlage (2a) eine Mehrzahl von thermoplastisch verformbaren Fasern (5) aufweist, mittels welcher die beiden Filterlagen (2a, 2b) abschnittsweise aneinandergefügt werden. according to which at least one first filter layer (2a) has a plurality of thermoplastically deformable fibers (5), by means of which the two filter layers (2a, 2b) are joined together in sections.
2. Verfahren nach Anspruch 1 , 2. Method according to claim 1,
dadurch gekennzeichnet, dass characterized in that
die wenigstens zwei Filterlagen (2a, 2b) jeweils wenigstens einen Abschnitt (7) aufweisen, in welchem sie nicht mittels der thermoplastischen Fasern (5) aneinandergefügt werden. the at least two filter layers (2a, 2b) each have at least one section (7) in which they are not joined together by means of the thermoplastic fibers (5).
3. Verfahren nach Anspruch 1 oder 2, 3. Method according to claim 1 or 2,
dadurch gekennzeichnet, dass characterized in that
die thermoplastischen Fasern (5) der zumindest einen ersten Filterlage (2a) vor und/oder während des Aneinanderfügens erwärmt werden, derart, dass die thermoplastischen Fasern (5) durch das Erwärmen erweicht und/oder wenigstens teilweise aufgeschmolzen werden. the thermoplastic fibers (5) of the at least one first filter layer (2a) are heated before and/or during joining, such that the thermoplastic fibers (5) are softened and/or at least partially melted by the heating.
4. Verfahren nach einem der Ansprüche 1 bis 3, 4. Method according to one of claims 1 to 3,
dadurch gekennzeichnet, dass characterized in that
die thermoplastischen Fasern (5) mittels einer Heizeinrichtung (10) erwärmt und thermoplastisch verformt werden. the thermoplastic fibers (5) are heated and thermoplastically deformed by means of a heating device (10).
Verfahren nach Anspruch 4, Method according to claim 4,
dadurch gekennzeichnet, dass characterized in that
die Heizeinrichtung (10) Teil eines Fügewerkzeugs (1 1 ) zum Aneinanderfügen der zwei Filterlagen ist. the heating device (10) is part of a joining tool (1 1) for joining the two filter layers together.
Verfahren nach einem der vorhergehenden Ansprüche, Method according to one of the preceding claims,
dadurch gekennzeichnet, dass characterized in that
zumindest eine Filterlage (2a, 2b) zusätzliche, nicht-thermoplastische Fasern aufweist. at least one filter layer (2a, 2b) has additional, non-thermoplastic fibers.
Verfahren einem der Ansprüche 2 bis 6, Method according to one of claims 2 to 6,
dadurch gekennzeichnet, dass characterized in that
das Fügewerkzeug (1 1 ) derart ausgebildet ist, dass in dem wenigstens einen Abschnitt (7), in welchem die beiden Filterlagen (2a, 2b) nicht mittels der thermoplastischen Fasern (5) aneinandergefügt werden, eine vorbestimmte Abstandsgeometrie erzeugt wird. the joining tool (1 1) is designed such that a predetermined distance geometry is generated in the at least one section (7) in which the two filter layers (2a, 2b) are not joined together by means of the thermoplastic fibers (5).
Verfahren einem der vorhergehenden Ansprüche 2, Method according to one of the preceding claims 2,
dadurch gekennzeichnet, dass characterized in that
die wenigstens zwei Filterlagen (2a, 2b) in einem Verfahrensschritt aneinandergefügt und in demselben Verfahrensschritt bereichsweise im Abstand zueinander angeordnet werden. the at least two filter layers (2a, 2b) are joined together in one process step and arranged in areas at a distance from one another in the same process step.
Verfahren nach Anspruch 8, Method according to claim 8,
dadurch gekennzeichnet, dass characterized in that
die mittels des Fügewerkzeugs (1 1 ) verwendete Abstandsgeometrie eine sinusartige Geometrie oder trapezartige Geometrie ist oder rillenartige Geometrie ist. the distance geometry used by the joining tool (1 1) is a sinusoidal geometry or trapezoidal geometry or is groove-like geometry.
10. Verfahren nach einem der vorhergehenden Ansprüche, 10. Method according to one of the preceding claims,
dadurch gekennzeichnet, dass characterized in that
mittels zumindest zweier weiterer Rollen (18a, 18b) des Presswerkzeugs (12) in den zumindest zwei Filterlagen (2a, 2b) wenigstens ein, vorzugsweise stegartig ausgebildeter, zusätzlicher Fügebereich (16) ausgebildet wird, in welchem die zumindest zwei Filterlagen (2a, 2b) aneinandergefügt werden. By means of at least two further rollers (18a, 18b) of the pressing tool (12), at least one, preferably web-like, additional joining region (16) is formed in the at least two filter layers (2a, 2b), in which the at least two filter layers (2a, 2b ) are joined together.
1 1 . Verfahren nach einem der Ansprüche 5 bis 10, 1 1 . Method according to one of claims 5 to 10,
dadurch gekennzeichnet, dass characterized in that
das Fügewerkzeug (1 1 ) eine Ultraschallquelle umfasst, so dass die zumindest zwei Filterlagen (2a, 2b) durch Ultraschalleinwirkung aneinandergefügt und bereichsweise im Abstand zueinander angeordnet werden. the joining tool (1 1) comprises an ultrasound source, so that the at least two filter layers (2a, 2b) are joined together by ultrasound and arranged at a distance from one another in areas.
12. Verfahren nach einem der vorhergehenden Ansprüche, 12. Method according to one of the preceding claims,
dadurch gekennzeichnet, dass characterized in that
wenigstens eine zweite Filterlage (2b) ohne Fasern bereitgestellt wird, die als Lagenmaterial Cellulose, insbesondere Papier, und/oder Nanofasern aufweist. at least one second filter layer (2b) is provided without fibers, which has cellulose, in particular paper, and / or nanofibers as the layer material.
13. Filtermedium (1 ), vorzugsweise hergestellt unter Durchführung des Verfahrens nach einem der vorhergehenden Ansprüche, 13. Filter medium (1), preferably produced by carrying out the method according to one of the preceding claims,
mit einer ersten Filterlage (2a) und wenigstens einer zweiten Filterlage (2b), wobei wenigstens eine Filterlage (2a, 2b) eine Mehrzahl von thermoplastischen Fasern (5) aufweist, mittels welcher die erste Filterlage (2a) und die wenigstens eine zweite Filterlage (2b) bereichsweise aneinandergefügt sind. with a first filter layer (2a) and at least one second filter layer (2b), at least one filter layer (2a, 2b) having a plurality of thermoplastic fibers (5), by means of which the first filter layer (2a) and the at least one second filter layer ( 2b) are joined together in areas.
14. Filtermedium (1 ) nach Anspruch 13, 14. Filter medium (1) according to claim 13,
dadurch gekennzeichnet, dass die beiden Filterlagen (2a, 2b) jeweils wenigstens einen Abschnitt (7) aufweisen, in welchem sie nicht mittels der thermoplastischen Fasern (5) aneinandergefügt sind. characterized in that the two filter layers (2a, 2b) each have at least one section (7) in which they are not joined together by means of the thermoplastic fibers (5).
15. Filtermedium (1 ) nach Anspruch 14, 15. Filter medium (1) according to claim 14,
dadurch gekennzeichnet, dass characterized in that
die zumindest zwei Filterlagen (2a, 2b), die in dem wenigstens einem Abschnitt (7) nicht mittels der thermoplastisch verformbaren Fasern (5) aneinandergefügt sind, eine vorbestimmte Abstandsgeometrie besitzen. the at least two filter layers (2a, 2b), which are not joined together in the at least one section (7) by means of the thermoplastically deformable fibers (5), have a predetermined spacing geometry.
16. Filtermedium (1 ) nach Anspruch 15, 16. Filter medium (1) according to claim 15,
dadurch gekennzeichnet, dass characterized in that
die vorbestimmte Abstandsgeometrie eine sinusartige oder trapezartige oder rillenartige oder nockenartige Geometrie ist. the predetermined distance geometry is a sinusoidal or trapezoidal or groove-like or cam-like geometry.
17. Filtermedium (1 ) nach einem der Ansprüche 12 bis 16, 17. Filter medium (1) according to one of claims 12 to 16,
dadurch gekennzeichnet, dass characterized in that
das Filtermedium unter Anwendung des Verfahrens nach einem der Ansprüche 1 bis 1 1 hergestellt ist. the filter medium is produced using the method according to one of claims 1 to 1 1.
EP17730692.5A 2016-05-31 2017-05-30 Method for manufacturing a filter medium, and filter medium Withdrawn EP3463614A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016209482.3A DE102016209482A1 (en) 2016-05-31 2016-05-31 Process for producing a filter medium and filter medium
PCT/EP2017/063002 WO2017207547A1 (en) 2016-05-31 2017-05-30 Method for manufacturing a filter medium, and filter medium

Publications (1)

Publication Number Publication Date
EP3463614A1 true EP3463614A1 (en) 2019-04-10

Family

ID=59070607

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17730692.5A Withdrawn EP3463614A1 (en) 2016-05-31 2017-05-30 Method for manufacturing a filter medium, and filter medium

Country Status (6)

Country Link
US (1) US20200023297A1 (en)
EP (1) EP3463614A1 (en)
CN (1) CN109195680A (en)
BR (1) BR112018074116A2 (en)
DE (1) DE102016209482A1 (en)
WO (1) WO2017207547A1 (en)

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3916838A1 (en) * 1989-05-19 1990-11-22 Lippold Hans Joachim FILTER INSERT
US5753343A (en) * 1992-08-04 1998-05-19 Minnesota Mining And Manufacturing Company Corrugated nonwoven webs of polymeric microfiber
CA2157380C (en) * 1993-04-01 1999-07-13 Leonard M. Van Rossen Filter device for the filtration of fluids
DE19900424B4 (en) * 1999-01-08 2006-04-06 Carl Freudenberg Kg Three-dimensionally structured fibrous sheet and method of manufacture
EP2279783A1 (en) * 2001-12-08 2011-02-02 IBS Filtran Kunststoff-/Metallerzeugnisse GmbH Multilayered composite filter medium for filtration in series
DE102006000782A1 (en) * 2006-01-04 2007-07-05 Johnson & Johnson Gmbh Multi-layer non-woven composite for absorptions and retention ability e.g. absorbing hygiene products, has first non-woven fabric layer, which has mixture of cellulose-based fabrics and thermoplastic fabrics
CN101378819A (en) * 2006-02-01 2009-03-04 东丽株式会社 Nonwoven fabric for filter and method for producing the same
DE102006062189B4 (en) 2006-12-22 2009-03-19 Dr. Mirtsch Gmbh Method for producing a structured material web for the passage of fluid media, structured material web and use thereof
US8147583B2 (en) * 2007-06-08 2012-04-03 Gore Enterprise Holdings, Inc. Multiple layer filter media
DE102007027268A1 (en) * 2007-06-11 2008-12-18 Sandler Ag Filter medium for air and liquid filtration
JP2010221210A (en) * 2009-02-27 2010-10-07 Sintokogio Ltd Antistatic filter cloth for surface filtration type dust collector
JP5842353B2 (en) * 2010-04-13 2016-01-13 Jnc株式会社 Bulky nonwoven fabric

Also Published As

Publication number Publication date
WO2017207547A1 (en) 2017-12-07
DE102016209482A1 (en) 2017-11-30
BR112018074116A2 (en) 2019-03-06
CN109195680A (en) 2019-01-11
US20200023297A1 (en) 2020-01-23

Similar Documents

Publication Publication Date Title
EP3415213B1 (en) Filter element
WO2018036956A1 (en) Assembled rotor shaft with an asymmetrical design, rotor, and method for producing the assembled rotor shaft and the rotor
WO2011113876A1 (en) Device for folding a web-shaped filter medium and method for producing a filter element folded in a zigzag shape
DE102010011722A1 (en) Method for producing a filter element
EP2986402B1 (en) Method for producing a multi-layer large pipe
EP2132024A2 (en) Compensation element for connecting components
DE102009025392A1 (en) Connecting element for multilayer media, filter element and method for connecting flat media
DE102016005464A1 (en) Joint structure for components to be joined by friction welding and method for joining components by friction welding
EP2300125A1 (en) Multi-layered filter web
DE3516862C2 (en)
DE102015001151A1 (en) Method for producing a welded joint
EP2229995B1 (en) Production method for a filter element
WO2017207547A1 (en) Method for manufacturing a filter medium, and filter medium
EP3352992A1 (en) Method and device for producing a security document
AT519010B1 (en) Motor vehicle component
DE102007006664A1 (en) Flat tube for heat exchanger
DE60212747T2 (en) fluid filter
EP0353413A1 (en) Ply bellow
EP4139024A1 (en) Zigzag-folded nonwoven material
WO2016046127A1 (en) Filter element with filter bellows
EP3224398B1 (en) Method for producing a folded connection in a domestic appliance component, and domestic appliance component
DE102014109754A1 (en) Coupling device for connecting two opposing shafts and method for producing such a coupling device
DE102017105319A1 (en) Method for producing a shift sleeve for a gear change transmission
EP3890863B1 (en) Method for producing a water separator, and water separator
EP4265401A1 (en) Tube and method for closing a tube

Legal Events

Date Code Title Description
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: UNKNOWN

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE

PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

17P Request for examination filed

Effective date: 20181029

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

DAV Request for validation of the european patent (deleted)
DAX Request for extension of the european patent (deleted)
GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: GRANT OF PATENT IS INTENDED

INTG Intention to grant announced

Effective date: 20191211

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20200603