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WO2006008209A1 - Procede de fabrication d'au moins une zone d'une structure de filtre, notamment d'un filtre a particules dans le systeme d'echappement d'un moteur a combustion interne - Google Patents

Procede de fabrication d'au moins une zone d'une structure de filtre, notamment d'un filtre a particules dans le systeme d'echappement d'un moteur a combustion interne Download PDF

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Publication number
WO2006008209A1
WO2006008209A1 PCT/EP2005/052526 EP2005052526W WO2006008209A1 WO 2006008209 A1 WO2006008209 A1 WO 2006008209A1 EP 2005052526 W EP2005052526 W EP 2005052526W WO 2006008209 A1 WO2006008209 A1 WO 2006008209A1
Authority
WO
WIPO (PCT)
Prior art keywords
film
filter
producing
sintered metal
support structure
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.)
Ceased
Application number
PCT/EP2005/052526
Other languages
German (de)
English (en)
Inventor
Leonore Schwegler
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch 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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of WO2006008209A1 publication Critical patent/WO2006008209A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • B01D39/20—Other self-supporting filtering material ; Other filtering material of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
    • B01D39/2027—Metallic material
    • B01D39/2031—Metallic material the material being particulate
    • B01D39/2037—Metallic material the material being particulate otherwise bonded

Definitions

  • the invention relates to a method for producing at least one region of a filter structure, in particular for a particulate filter in the exhaust system of an internal combustion engine, in which a filter material is connected to a support structure.
  • a filter device of the type mentioned is known from DE 101 28 936 Al.
  • the particle filter shown there is installed in the exhaust system of a diesel internal combustion engine.
  • the filter walls in the known filter device are made of sintered metal and arranged so that wedge-shaped filter bags are formed.
  • the tapered wedge edges of the filter pockets show against the flow direction of the exhaust gas, the rear narrow side of a filter pocket seen in the flow direction is open.
  • the filter bags are arranged side by side in such a way that an overall rotationally symmetrical, annular filter structure is formed.
  • the filter walls are formed by labile sintered metal foils or sintered metal mats, which are connected to separate supporting or support structures, for example perforated plates, metal fabrics or the like.
  • Object of the present invention is to develop a method of the type mentioned so that a filter device with precisely defined properties can be produced inexpensively.
  • Sintered metal filling can be defined very precisely. By the latter, the powder coverage per area and thus the weight per square meter can be set exactly. Ultimately, the permeability of the sintered metal filter can be precisely predefined by these parameters.
  • the mixture may also contain a solvent (especially when using a casting process) and other organic additives (according to the respective process requirements).
  • the lamination of the film on the support structure allows a reliable connection of the film with the support structure and results after sintering a quasi-one-piece and thus very stable composite, which can be easily processed.
  • the individual filter walls, from which the filter bags known per se are produced can be sawn out of the sintered composite without problems.
  • Such a lamination process is technically manageable without great regulatory effort.
  • the lamination process can be run continuously or discontinuously with high throughputs, which also contributes to a reduction in manufacturing costs.
  • the life of the filter device is increased by the method according to the invention, since the stable and planar connection of the support structure with the sintered metal foil is practically insoluble.
  • the film be produced by film doctoring, film casting or film extrusion. All these methods allow an exact adjustment of the film thickness and the production of a homogeneous, smooth and free of air bubbles Sinterraetallfolie.
  • the lamination takes place in step c, preferably at a temperature in the range of 80-150 ° Celsius, preferably in the range of 80-90 ° Celsius.
  • the lamination temperature at which the sintered metal foil is plasticized and laminatable and the best possible adhesion between the sintered metal foil and the support structure can be very well adjusted by an appropriate selection and amount of the organic binder.
  • the specified temperature range is therefore particularly advantageous since the required energy input is limited and yet a good adhesive effect is already achieved with conventional organic and thermoplastic binders. This is especially true for the range of 80 - 90 ° Celsius.
  • a metallic fabric, an expanded metal or a perforated plate is used as the support structure. These are inexpensive, cover only a small area and thus allow in operation a high gas flow rate.
  • step c the surface structure of the support structure is imaged on the foil. This will cause the surface of the Filter device increases, resulting in a better filter capacity.
  • step c or after this step a pattern is introduced into the surface of the film.
  • This can be done in a simple manner by means of a structured laminating roller.
  • a defined surface can be created, which corresponds to the particular application of requirements.
  • Optimum filter properties in particular when the filter device is used as a particle filter in the exhaust system of an internal combustion engine, are achieved when the sintered metal powder has a grain size of approximately 1-150 ⁇ m, preferably 40-70 ⁇ m, more preferably 50-60 ⁇ m.
  • step a the sintered metal powder is processed with about 8% by weight of acrylate binder and butyl acetate as solvent to form a sacable slip.
  • the film has a thickness of approximately 90-500 ⁇ m before lamination.
  • Figure 1 is a schematic representation of an internal combustion engine with a particulate filter with a filter structure
  • Figure 2 is a perspective view of
  • FIG. 3 shows two filter pockets of the filter structure of FIG.
  • FIG. 4 is a flowchart of a method of fabricating a filter wall of the filter structure of FIG. 1;
  • FIG. 5 a section through a first embodiment of a filter wall of the filter bag of FIG. 3 before a sintering step
  • Figure 6 is a view similar to Figure 4 of a second embodiment.
  • Figure 7 is a view similar to Figure 4 of a third embodiment.
  • an internal combustion engine carries the reference numeral 10. To it belongs an exhaust system 12, in which a
  • the particulate filter 14 is arranged. By means of this, for example, soot particles can be filtered out of the exhaust gas of the internal combustion engine 10.
  • the particulate filter 14 comprises a housing 16 and a filter structure 18 arranged in the housing 16.
  • the filter structure 18 is shown in more detail in Figure 2: It comprises a plurality of wedge-shaped filter pockets 20, which are arranged with their tapered wedge edge opposite to the flow direction of the exhaust gas.
  • the filter pockets 20 are arranged side by side about a total longitudinal axis, so that a total rotationally symmetrical filter structure 18 is formed.
  • the radially inner and outer narrow sides of the filter pockets 20 are closed.
  • the downstream in the flow direction narrow sides of the filter bags 20 are open. In the area of their rear ends in the flow direction, the filter bags are interconnected.
  • FIG. 3 two adjacent filter pockets 20a and 20b are shown.
  • the exhaust gas enters an area between the two filter pockets 20a and 20b, passes through a lateral filter wall 22 and thus enters the interior of the respective filter pocket 20a and 20b.
  • the exhaust gas flow is represented by an arrow 24.
  • the particles are separated from the exhaust gas and deposited on the upstream surface of the side wall 22.
  • Filter bags 20 are made of a porous sintered metal, which is stabilized or held by a support structure.
  • a method for producing, for example, the side walls 22 of the filter bags 20 is shown in FIG. 4.
  • sintered metal powder 26 having a grain size of approximately 50-60 ⁇ m with approximately 8% by weight of acrylate binder 28 and butyl acetate as solvent 30 are made into a squeegee by means of a device 32 34 processed. This is with a film doctor blade 36 to a 90 - 100 microns thick Processed sintered metal foil 38, which is also referred to as "green sheet".
  • the latter is laminated by means of a laminating roller 40 to an approximately 0.4 mm thick expanded metal 42.
  • the sintered metal foil 38 is heated to a temperature of about 80 ° Celsius, placed on the expanded metal 42 and briefly pressed. Since the film is comparatively thin with 90-100 .mu.m, after pressing on the corresponding blank 44, the structure of the
  • Expanded metal 42 clearly.
  • the security against tearing etc. in this "embossing" is increased when the film is even thicker.
  • the laminating roller 40 can also have on its surface a specific structure which is impressed into the surface of the sintered metal foil 38 during lamination.
  • the blank 44 is then sintered, resulting in a quasi-one-piece composite 48.
  • a sawing device 50 the individual side walls 22 are then sawed out.
  • FIGS. 5, 6 and 7 show sections through various embodiments of blanks 44:
  • FIG. 5 shows a blank 44 which has been produced by means of a comparatively thick sintered metal foil 38. Overall, the surface 52 of the laminated sintered metal foil 38 is smooth.
  • the blank drawn in FIG. 6 corresponds to the one produced using the method described in FIG. 4. It can be seen that the

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  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Filtering Materials (AREA)

Abstract

Selon l'invention, une paroi latérale (22) d'une structure de filtre à particules d'un système d'échappement d'un moteur à combustion interne est fabriquée par liaison d'un matériau de filtre (38) à une structure support (42). Le procédé selon l'invention consiste notamment (a) à fabriquer (32) un mélange (34) composé d'une poudre métallique frittée (26) et d'un liant organique (28); (b) à fabriquer (36) une pellicule (38) composée de ce mélange (34); (c) à laminer (40) la feuille (38) sur la structure support (42); et, à réaliser un frittage (46).
PCT/EP2005/052526 2004-07-21 2005-06-02 Procede de fabrication d'au moins une zone d'une structure de filtre, notamment d'un filtre a particules dans le systeme d'echappement d'un moteur a combustion interne Ceased WO2006008209A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200410035310 DE102004035310A1 (de) 2004-07-21 2004-07-21 Verfahren zum Herstellen mindestens eines Bereichs einer Filterstruktur, insbesondere für einen Partikelfilter im Abgassystem einer Brennkraftmaschine
DE102004035310.7 2004-07-21

Publications (1)

Publication Number Publication Date
WO2006008209A1 true WO2006008209A1 (fr) 2006-01-26

Family

ID=34969078

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2005/052526 Ceased WO2006008209A1 (fr) 2004-07-21 2005-06-02 Procede de fabrication d'au moins une zone d'une structure de filtre, notamment d'un filtre a particules dans le systeme d'echappement d'un moteur a combustion interne

Country Status (2)

Country Link
DE (1) DE102004035310A1 (fr)
WO (1) WO2006008209A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3711279A (en) * 1969-02-07 1973-01-16 Onera (Off Nat Aerospatiale) Methods for manufacture of sintering thin porous metallic sheets
US5679441A (en) * 1992-12-18 1997-10-21 N.V. Bekaert S.A. Process for continuously manufacturing a porous laminate

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3711279A (en) * 1969-02-07 1973-01-16 Onera (Off Nat Aerospatiale) Methods for manufacture of sintering thin porous metallic sheets
US5679441A (en) * 1992-12-18 1997-10-21 N.V. Bekaert S.A. Process for continuously manufacturing a porous laminate

Also Published As

Publication number Publication date
DE102004035310A1 (de) 2006-02-16

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