DE102010007679A1 - Producing ceramic filter elements in an exhaust gas filter for combustion engines such as a diesel particulate filter, comprises impregnating a flow channel having non-ceramic support web with a ceramic slip, - Google Patents

Producing ceramic filter elements in an exhaust gas filter for combustion engines such as a diesel particulate filter, comprises impregnating a flow channel having non-ceramic support web with a ceramic slip, Download PDF

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Publication number
DE102010007679A1
DE102010007679A1 DE102010007679A DE102010007679A DE102010007679A1 DE 102010007679 A1 DE102010007679 A1 DE 102010007679A1 DE 102010007679 A DE102010007679 A DE 102010007679A DE 102010007679 A DE102010007679 A DE 102010007679A DE 102010007679 A1 DE102010007679 A1 DE 102010007679A1
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Prior art keywords
ceramic
filter
drying
exhaust gas
diesel particulate
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DE102010007679A
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German (de)
Inventor
Andreas 71638 Franz
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Mann and Hummel GmbH
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Mann and Hummel GmbH
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Priority to DE102010007679A priority Critical patent/DE102010007679A1/en
Publication of DE102010007679A1 publication Critical patent/DE102010007679A1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B7/00—Moulds; Cores; Mandrels
    • B28B7/34—Moulds, cores, or mandrels of special material, e.g. destructible materials
    • B28B7/342—Moulds, cores, or mandrels of special material, e.g. destructible materials which are at least partially destroyed, e.g. broken, molten, before demoulding; Moulding surfaces or spaces shaped by, or in, the ground, or sand or soil, whether bound or not; Cores consisting at least mainly of sand or soil, whether bound or not
    • 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
    • B01D39/2068—Other inorganic materials, e.g. ceramics
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
    • C04B38/0006—Honeycomb structures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/022—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous
    • F01N3/0222—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous the structure being monolithic, e.g. honeycombs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/022—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous
    • F01N3/0226—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous the structure being fibrous
    • 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
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2279/00—Filters adapted for separating dispersed particles from gases or vapours specially modified for specific uses
    • B01D2279/30—Filters adapted for separating dispersed particles from gases or vapours specially modified for specific uses for treatment of exhaust gases from IC Engines
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00793—Uses not provided for elsewhere in C04B2111/00 as filters or diaphragms
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/0081—Uses not provided for elsewhere in C04B2111/00 as catalysts or catalyst carriers
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
    • C04B2235/54—Particle size related information
    • C04B2235/5418—Particle size related information expressed by the size of the particles or aggregates thereof
    • C04B2235/5436—Particle size related information expressed by the size of the particles or aggregates thereof micrometer sized, i.e. from 1 to 100 micron
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/60—Aspects relating to the preparation, properties or mechanical treatment of green bodies or pre-forms
    • C04B2235/606—Drying
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2330/00—Structure of catalyst support or particle filter
    • F01N2330/06—Ceramic, e.g. monoliths
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2330/00—Structure of catalyst support or particle filter
    • F01N2330/10—Fibrous material, e.g. mineral or metallic wool
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2330/00—Structure of catalyst support or particle filter
    • F01N2330/14—Sintered material
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Structural Engineering (AREA)
  • Materials Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Manufacturing & Machinery (AREA)
  • Filtering Materials (AREA)
  • Processes For Solid Components From Exhaust (AREA)

Abstract

The method for producing ceramic filter elements in an exhaust gas filter for combustion engines such as a diesel particulate filter, comprises impregnating a flow channel having non-ceramic support web with a ceramic slip, and then carrying and/or drying in a wound mould. A purposeful choice of the drying parameters is adjusted in different pressure losses in the flow channels of the filter elements produced by subsequent sintering. The drying is carried out of less than 10 days in a drying chamber at 10 to 90% of relative humidity, and is carried out in a microwave device. The method for producing ceramic filter elements in an exhaust gas filter for combustion engines such as a diesel particulate filter, comprises impregnating a flow channel having non-ceramic support web with a ceramic slip, and then carrying and/or drying in a wound mould. A purposeful choice of the drying parameters is adjusted in different pressure losses in the flow channels of the filter elements produced by subsequent sintering. The drying is carried out of less than 10 days in a drying chamber at 10 to 90% of relative humidity, and is carried out in a microwave device with an energy input of 1 kW/kg of component mass at 10-90% of the relative humidity. The slip possesses a particle size below 5 mu m of particle diameter for 99% of the particle.

Description

Technisches GebietTechnical area

Die Erfindung betrifft ein Verfahren zur Herstellung eines keramischen Filterelements in einem Abgasfilter einer Brennkraftmaschine. Insbesondere betrifft die Erfindung einen keramischen Dieselpartikelfilter.The invention relates to a method for producing a ceramic filter element in an exhaust filter of an internal combustion engine. In particular, the invention relates to a ceramic diesel particulate filter.

Stand der TechnikState of the art

In Patent Abstracts of Japan JP 63134020 A wird ein keramisches Filterelement für einen Abgasfilter in einer Brennkraftmaschine beschrieben, das aus einer gewellten, spiralförmig aufgewickelten Filterbahn aufgebaut ist. Zur Herstellung der Filterbahn werden hitzeresistente, anorganische Fasern in einer wässrigen Suspension mit Keramikpulver vermischt und zu einer Bahn verarbeitet. Mehrere übereinander liegende Bahnen werden zu der gewünschten Form des Filterkörpers zusammengerollt, wobei zwischen benachbarten Filterbahnen wabenförmige Strömungskanäle gebildet sind. Der Filterkörper wird anschließend bei hoher Temperatur gebrannt.In Patent Abstracts of Japan JP 63134020 A a ceramic filter element is described for an exhaust filter in an internal combustion engine, which is constructed of a corrugated, spirally wound filter web. To produce the filter web, heat-resistant, inorganic fibers are mixed with ceramic powder in an aqueous suspension and processed to form a web. Several superimposed webs are rolled up to the desired shape of the filter body, wherein honeycomb flow channels are formed between adjacent filter webs. The filter body is then fired at high temperature.

Die WO 2006/005668 offenbart ein Verfahren zur Herstellung eines keramischen Filterelements in einem Abgasfilter für Brennkraftmaschinen. Hierbei wird zunächst eine brennbare, nicht-keramische Trägerbahn mit einem keramischen Schlicker getränkt und anschließend in der gewünschten geometrischen Form soweit ausgebrannt, bis die Trägerbahn verbrannt und ein starrer Filterkörper gebildet ist.The WO 2006/005668 discloses a method of manufacturing a ceramic filter element in an exhaust gas filter for internal combustion engines. Here, a combustible, non-ceramic carrier web is first soaked with a ceramic slip and then burned out in the desired geometric shape until the carrier web is burned and a rigid filter body is formed.

Die Erfindung bezieht sich insbesondere auf die Herstellung von keramischen Filterelementen als Dieselpartikelfiltern und Partikelfiltern für Brennkraftmaschinen sowie als keramischen Trägern für Katalysatorträger.The invention relates in particular to the production of ceramic filter elements as diesel particulate filters and particulate filters for internal combustion engines and as ceramic supports for catalyst supports.

Im bei der Erfindung bevorzugten Verfahren wird ein nichtkeramisches Medium, z. B. Papier, insbesondere solches umfassend Cellulose, zunächst in Form gebracht, z. B. in Form eines Wickelkörpers. Der Wickelkörper kann dabei eine Flach- und eine Welllage umfassen. Diese Form, z. B. der Wickelkörper, wird dann mit einer keramischen Masse, z. B. einem keramischen Schlicker getränkt. Die getränkte Form wird dann gebrannt bzw. gesintert. Hierbei können organische Bestandteile, z. B. des Papiers, das z. B. Cellulosefasern umfasst, entfernt oder umgewandelt werden.In the preferred method of the invention is a non-ceramic medium, for. As paper, in particular such comprising cellulose, first brought into shape, for. B. in the form of a wound body. The winding body may comprise a flat and a corrugated layer. This form, for. B. the bobbin is then filled with a ceramic material, for. B. soaked in a ceramic slip. The impregnated mold is then fired or sintered. In this case, organic components, for. As the paper z. As cellulose fibers, removed or converted.

Bei den oben beschriebenen gewickelten Filterelementen, insbesondere Dieselpartikelfilter, kann im Trocknungsprozess ein von innen nach außen zunehmendes Keramikflächengewicht festgestellt werden. Es sind dabei Unterschiede bis zum vierfachen Wert von Maximum zu Minimum möglich.In the above-described wound filter elements, in particular diesel particulate filter, a ceramic surface weight increasing from the inside to the outside can be ascertained in the drying process. Differences of up to four times the value from maximum to minimum are possible.

Offenbarung der ErfindungDisclosure of the invention

Es ist die Aufgabe der vorliegenden Erfindung, ein erfindungsgemäßes Verfahren zur Herstellung eines keramisches Filterelements, insbesondere eines Dieselpartikelfilters, für einen Abgasfilter einer Brennkraftmaschine und/oder einen Katalysatorträger bereitzustellen, das es erlaubt, in dem gewickelten Filterelement unterschiedliche Druckverluste zu realisieren.It is the object of the present invention to provide a method according to the invention for producing a ceramic filter element, in particular a diesel particulate filter, for an exhaust gas filter of an internal combustion engine and / or a catalyst carrier, which makes it possible to realize different pressure losses in the wound filter element.

Diese und weitere Aufgaben werden durch das Verfahren zur Herstellung eines keramischen Filterelements nach Anspruch 1 gelöst.These and other objects are achieved by the method for producing a ceramic filter element according to claim 1.

Ausführungsform(en) der ErfindungEmbodiment (s) of the invention

Wie bereits oben erwähnt, kann im Trocknungsprozess von gewickelten Keramikfiltern ein von innen nach außen zunehmendes Keramikflächengewicht festgestellt werden.As already mentioned above, in the drying process of wound ceramic filters, a ceramic surface weight increasing from the inside to the outside can be ascertained.

Durch geschickte Wahl der Regenerationsstrategie, d. h., der Regenerationsparameter beim Trocknen kann der Motor, in dessen Abgasfilter das keramische Filterelement eingebaut wird, entweder auf Verbrauch, Maximalbeladung oder eine Mischform davon eingestellt werden.By skillful choice of regeneration strategy, d. h., the regeneration parameter during drying, the engine, in whose exhaust filter the ceramic filter element is installed, either consumption, maximum load or a mixed form thereof can be set.

Durch geringen Druckverlust im Inneren des Bauteils ist beim unbeladenen Filter ein Vorteil im Kraftstoffverbrauch zu erwarten. Außerdem wird das Bauteil zuerst in der Mitte mit Ruß beladen, bei zunehmender Beladung nach außen nimmt der Druckverlust stärker zu.Due to low pressure loss inside the component, the unladen filter can be expected to have an advantage in fuel consumption. In addition, the component is first loaded in the middle with soot, with increasing loading to the outside, the pressure loss increases more.

ZITATE ENTHALTEN IN DER BESCHREIBUNG QUOTES INCLUDE IN THE DESCRIPTION

Diese Liste der vom Anmelder aufgeführten Dokumente wurde automatisiert erzeugt und ist ausschließlich zur besseren Information des Lesers aufgenommen. Die Liste ist nicht Bestandteil der deutschen Patent- bzw. Gebrauchsmusteranmeldung. Das DPMA übernimmt keinerlei Haftung für etwaige Fehler oder Auslassungen.This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Zitierte PatentliteraturCited patent literature

  • JP 63134020 A [0002] JP 63134020 A [0002]
  • WO 2006/005668 [0003] WO 2006/005668 [0003]

Claims (4)

Verfahren zur Herstellung eines keramischen Filterelements in einem Abgasfilter für Brennkraftmaschinen, insbesondere eines Dieselpartikelfilters, bei dem eine Strömungskanäle aufweisende nicht-keramische Trägerbahn mit einem keramischen Schlicker getränkt und anschließend in eine gewickelte Form gebracht und getrocknet wird, dadurch gekennzeichnet, dass durch eine gezielte Wahl der Trocknungsparameter unterschiedliche Druckverluste in den Strömungskanälen des durch anschließendes sintern hergestellten Filterelements eingestellt werden.Method for producing a ceramic filter element in an exhaust gas filter for internal combustion engines, in particular a diesel particulate filter, in which a non-ceramic carrier web having flow channels is impregnated with a ceramic slurry and subsequently brought into a wound form and dried, characterized in that by a specific choice of Drying parameters different pressure losses in the flow channels of the sintered filter element produced by subsequent sintered be set. Verfahren nach Anspruch 1, wobei die Trocknung einen Schritt von weniger als 10 Tagen im Trockenschrank bei 10 bis 90% rel. Luftfeuchtigkeit umfasst.The method of claim 1, wherein the drying step is less than 10 days in a drying oven at 10 to 90% rel. Humidity includes. Verfahren nach einem der vorherigen Ansprüche, wobei die Trocknung einen Schritt in einer Mikrowellenvorrichtung mit einem Energieeintrag von 1 kW/kg Bauteilmasse bei 10 bis 90% rel. Luftfeuchtigkeit umfasst.Method according to one of the preceding claims, wherein the drying of a step in a microwave device with an energy input of 1 kW / kg component mass at 10 to 90% rel. Humidity includes. Das Verfahren nach einem der vorherigen Ansprüche, wobei der Schlicker eine Partikelgröße unterhalb von 5 μm Partikeldurchmesser für mehr als 99% der Partikel besitzt.The method according to any one of the preceding claims, wherein the slurry has a particle size below 5 microns particle diameter for more than 99% of the particles.
DE102010007679A 2010-02-10 2010-02-10 Producing ceramic filter elements in an exhaust gas filter for combustion engines such as a diesel particulate filter, comprises impregnating a flow channel having non-ceramic support web with a ceramic slip, Withdrawn DE102010007679A1 (en)

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DE102010007679A DE102010007679A1 (en) 2010-02-10 2010-02-10 Producing ceramic filter elements in an exhaust gas filter for combustion engines such as a diesel particulate filter, comprises impregnating a flow channel having non-ceramic support web with a ceramic slip,

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DE102010007679A DE102010007679A1 (en) 2010-02-10 2010-02-10 Producing ceramic filter elements in an exhaust gas filter for combustion engines such as a diesel particulate filter, comprises impregnating a flow channel having non-ceramic support web with a ceramic slip,

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63134020A (en) 1986-11-27 1988-06-06 Matsushita Electric Ind Co Ltd Exhaust gas filter for diesel engine
WO2006005668A1 (en) 2004-07-10 2006-01-19 Mann+Hummel Gmbh Method for producing a ceramic filter element

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63134020A (en) 1986-11-27 1988-06-06 Matsushita Electric Ind Co Ltd Exhaust gas filter for diesel engine
WO2006005668A1 (en) 2004-07-10 2006-01-19 Mann+Hummel Gmbh Method for producing a ceramic filter element

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