JPH06190218A - Method for sealing honeycomb filter - Google Patents
Method for sealing honeycomb filterInfo
- Publication number
- JPH06190218A JPH06190218A JP4347901A JP34790192A JPH06190218A JP H06190218 A JPH06190218 A JP H06190218A JP 4347901 A JP4347901 A JP 4347901A JP 34790192 A JP34790192 A JP 34790192A JP H06190218 A JPH06190218 A JP H06190218A
- Authority
- JP
- Japan
- Prior art keywords
- sealing material
- honeycomb filter
- sealing
- feeder
- hole
- 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.)
- Pending
Links
Landscapes
- Filtering Of Dispersed Particles In Gases (AREA)
- Processes For Solid Components From Exhaust (AREA)
- Filtering Materials (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はディ−ゼルエンジン等の
内燃機関から排出されるガス中に含まれるパティキュレ
−トを除去するための排気ガス浄化装置に使用される多
孔質のハニカムフィルタ端面を封口する方法に関し、特
に従来使用していた封口用マスクを使用せずハニカムフ
ィルタ端面を封口する方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a porous honeycomb filter end face used in an exhaust gas purifying apparatus for removing particulates contained in gas discharged from an internal combustion engine such as a diesel engine. The present invention relates to a method for sealing, and particularly to a method for sealing an end face of a honeycomb filter without using a conventionally used mask for sealing.
【０００２】[0002]
【従来の技術】ディ−ゼルエンジン等の内燃機関の排気
ガス浄化装置に使用される多孔質のハニカムフィルタ
は、多孔質セラミック材料より作られ、薄い隔壁をもっ
て長手方向に平行に、且つ、均一に分布されている多数
の貫通孔よりなっている。そして、その貫通孔の一方の
端面は市松模様状に封口され、残余の封口されていない
貫通孔は、その他方の端面が封口されている。したがっ
て、排気ガスは開口されている貫通孔より導入され隔壁
を通過して他端の開口されている他の貫通孔より排出さ
れ、排気ガス中に含まれているパティキュレ−トは隔壁
を通過するとき捕集される。ところで、このようなハニ
カムフィルタの端面の封口方法としては、例えば、多孔
質セラミックハニカム構造体の開口端面にフィルムを貼
り、そのフィルムの所定部分に穴を開け、或いは所定部
分が穿孔されているフィルムを貼り、次いで、その穴よ
り貫通孔に封じ材を導入して所定の貫通孔を封口する方
法がある（特開昭５７−７２１５号公報参照）。しか
し、この方法は所定の大きさ、形状のペ−スト通過孔を
迅速かつ確実に形成する必要があるが、このことは労力
及び設備の点から困難であり、極めて煩瑣であった。2. Description of the Related Art A porous honeycomb filter used in an exhaust gas purifying apparatus for an internal combustion engine such as a diesel engine is made of a porous ceramic material and has thin partition walls parallel to the longitudinal direction and uniform. It consists of a number of distributed through holes. Then, one end surface of the through hole is sealed in a checkered pattern, and the remaining unsealed through hole is sealed at the other end surface. Therefore, the exhaust gas is introduced through the open through hole, passes through the partition wall, and is discharged through the other through hole at the other end, and the particulates contained in the exhaust gas pass through the partition wall. When caught. By the way, as a method of sealing the end surface of such a honeycomb filter, for example, a film is attached to the opening end surface of the porous ceramic honeycomb structure, a hole is formed in a predetermined portion of the film, or a film in which a predetermined portion is perforated. Then, there is a method of sealing a predetermined through hole by introducing a sealing material into the through hole through the hole (see JP-A-57-7215). However, this method needs to form the paste passage holes of a predetermined size and shape quickly and surely, but this is difficult and laborious in terms of labor and equipment.
【０００３】そこで、本件出願人は、先にペ−ストを供
給可能なペ−スト供給体とハニカムフィルタとを相対移
動させながら、所定の貫通孔の端部周りにペ−ストを供
給して封口する方法を提案した（特願平３−１７９９５
６号参照）。この方法は前記の特開昭５７−７２１５号
のようにフィルム製のマスクを設ける必要は無いが、所
定の貫通孔を１ケずつ封口していくためには封口時間が
長く掛る欠点を有する。Therefore, the applicant of the present application supplies the paste around the end of a predetermined through hole while moving the paste supply body capable of supplying the paste and the honeycomb filter first. Proposed a method of sealing (Japanese Patent Application No. 3-17995)
(See No. 6). This method does not require the provision of a film mask as in the above-mentioned Japanese Patent Laid-Open No. 57-7215, but it has a drawback that it takes a long time to seal a predetermined through hole one by one.
【０００４】[0004]
【発明が解決しようとする課題】本発明者は、この様な
欠点を改良し、簡単な操作により封口できるよう種々検
討した結果、本願発明を完成したもので、その目的は、
封口用マスクが不要であって、ハニカムフィルタの各端
面の所定の貫通孔内に同時に正確かつ確実に封口材（以
下、封口用ペ−スト、若しくは、単にペ−ストともい
う）を充填することが出来るハニカムフィルタの封口方
法を提供することである。The present inventor has completed the invention of the present application as a result of various studies to improve such drawbacks and make it possible to seal by a simple operation.
A sealing mask is not necessary, and the sealing material (hereinafter, also referred to as a sealing paste or simply a paste) is simultaneously and accurately filled in a predetermined through hole on each end surface of the honeycomb filter at the same time. It is to provide a method of sealing a honeycomb filter capable of performing the above.
【０００５】[0005]
【課題を解決するための手段】すなわち、本発明の要旨
は、多孔質のハニカムフィルタに設けられた複数の貫通
孔のうち所定の貫通孔を封口するに際し、封口すべき貫
通孔に挿入する管体を突設した基板を有する封口供給器
を用い、該管体をハニカムフィルタの端部開口部に挿入
してハニカムフィルタの端部開口部と封口材供給器の基
板とを密着させ、封口材供給器中に供給された封口材中
にハニカムフィルタを浸漬することにより所定の貫通孔
の端面を封口することを特徴とするハニカムフィルタの
封口方法であり、封口材供給器中に封口材を供給する手
段としては、封口材供給器を封口材容器に収納し、封口
材容器に振動を与えて封口材容器中の封口剤を流動化
し、該封口材の所定容量を封口材供給器に供給するよう
にすることが好ましく、また、封口材中にハニカムフィ
ルタを浸漬するに際し、封口材を加振することが好まし
い。That is, the gist of the present invention is to insert a pipe into a through hole to be sealed when sealing a predetermined through hole among a plurality of through holes provided in a porous honeycomb filter. Using a sealing feeder having a substrate with a protruding body, the tubular body is inserted into the end opening of the honeycomb filter to bring the end opening of the honeycomb filter into close contact with the substrate of the sealing material feeder, and the sealing material A sealing method for a honeycomb filter, characterized in that the end face of a predetermined through hole is sealed by immersing the honeycomb filter in the sealing material supplied into the supply device, and the sealing material is supplied into the sealing material supply device. As a means to do so, the sealing material feeder is housed in a sealing material container, the sealing material container is vibrated to fluidize the sealing material in the sealing material container, and a predetermined volume of the sealing material is supplied to the sealing material feeder. Like to do Further, upon immersing the honeycomb filter during the plugging material, it is preferable to vibrate the plugging material.
【０００６】すなわち、本発明において、貫通孔の端部
開口部を封口するため、封口材を供給可能な封口材供給
器の基板と、ハニカムフィルタとを密着させ、次いで封
口材が充填されている中に所定深さ迄浸漬することによ
って、封口すべき所定の各開口部内に同時に、且つ、均
一に封口材を充填するのである。従って、封口用フィル
ム製マスクを用いた従来法とは異なり、粘性の高い封口
材を多数の所定端面開口内に瞬時に充填することが可能
であり、殊に、封口材としてチキソトロピ−性を有する
場合封口材を加振することにより、より一層充填が容易
となる。That is, in the present invention, in order to seal the end opening of the through hole, the substrate of the sealing material feeder capable of supplying the sealing material and the honeycomb filter are brought into close contact with each other, and then the sealing material is filled. The sealing material is simultaneously and uniformly filled in each of the predetermined openings to be sealed by immersing the sealing material in a predetermined depth. Therefore, unlike the conventional method using a mask made of a film for sealing, it is possible to instantly fill a large number of predetermined end face openings with a highly viscous sealing material, and in particular, it has a thixotropic property as a sealing material. In this case, by vibrating the sealing material, the filling becomes easier.
【０００７】以下に、本発明の封口方法について詳細に
説明する。本発明方法で封口される多孔質のハニカムフ
ィルタＦは、一般に多孔質炭化珪素、コ−ジュライト、
ムライト等の材料により製造されており、その断面形状
は四角形状、円柱状等を成している。フィルタＦには長
手方向に沿って多数の貫通孔Ｈが形成されており、その
貫通孔Ｈのうち所定のものが封口されている（図１参
照）。そして、この封口材は焼成前のハニカム成形体若
しくは仮焼成したハニカム成形体に供給され、本焼成に
より封口材とハニカム成形体が一体化される。ハニカム
フィルタＦの貫通孔Ｈの端部開口部に充填される封口材
について説明する。前記封口材はハニカムフィルタと同
じ主成分とするチキソトロピ−性を有する粘性流動体で
あって、貫通孔Ｈの端部開口部に供給された後に焼結さ
れることが望ましい。その理由は粘性がないと端部開口
内に保持されないからであり、封口材供給後に焼結され
ることの理由は、封口を完全にしてハニカムフィルタＦ
と一体化するためである。又、前記封口材を調整する場
合、その粘度は１，０００ｃ．ｐ〜１，５００，０００
ｃ．ｐであることが好ましい。粘度が１，０００ｃ．ｐ
未満であると、貫通孔Ｈ内に供給したとしても、封口材
の流動性が高過ぎて、端部開口付近に均一に保持するこ
とが出来なくなり、１，５００，０００ｃ．ｐ以上にな
るとペ−ストの流動性に乏しいため端部開口内に供給す
ることが難しくなる。また、この場合、ペ−ストと貫通
孔Ｈ隔壁との密着性が悪くなる。The sealing method of the present invention will be described in detail below. The porous honeycomb filter F sealed by the method of the present invention is generally porous silicon carbide, cordierite,
It is manufactured from a material such as mullite, and its cross-sectional shape is square, columnar, or the like. A large number of through holes H are formed in the filter F along the longitudinal direction, and a predetermined one of the through holes H is sealed (see FIG. 1). Then, this sealing material is supplied to the honeycomb molded body before firing or the preliminarily fired honeycomb molded body, and by the main firing, the sealing material and the honeycomb molded body are integrated. The sealing material filled in the end opening of the through hole H of the honeycomb filter F will be described. The sealing material is a viscous fluid having the same thixotropic property as that of the honeycomb filter, and is preferably sintered after being supplied to the end opening of the through hole H. The reason is that it is not retained in the end opening unless it has viscosity, and the reason why it is sintered after supplying the sealing material is that the sealing is completed and the honeycomb filter F is
This is because it is integrated with. When the sealing material is prepared, its viscosity is 1,000 c.s. p-1,500,000
c. It is preferably p. Viscosity is 1,000 c. p
If it is less than 1, even if supplied into the through-hole H, the fluidity of the sealing material is too high, and it becomes impossible to uniformly hold the sealing material near the end opening, resulting in 1,500,000 c. If it is more than p, the fluidity of the paste is poor and it becomes difficult to supply the paste into the end opening. Further, in this case, the adhesion between the paste and the partition wall of the through hole H becomes poor.
【０００８】次に、本発明の封口方法を図をもって説明
する。図２は本発明の方法に使用する封口装置の一例で
あり、図３はその際使用する封口材供給装置である。図
２において、ハニカムフィルタＦは昇降装置６によって
昇降し、封口材供給器１との密着又は切離しを行う。前
記封口材供給器１は封口材容器２の内部に配置され、封
口材容器２内に設けたスプリングによって封口材供給器
１の底部に固定されている。封口材容器２内には封口材
１ａが１ｂレベル迄挿入されている。封口材容器２は振
動装置３の上面テ−ブルに固定されている。Next, the sealing method of the present invention will be described with reference to the drawings. FIG. 2 is an example of a sealing device used in the method of the present invention, and FIG. 3 is a sealing material supply device used in that case. In FIG. 2, the honeycomb filter F is moved up and down by the elevating device 6 to be brought into close contact with or separated from the sealing material feeder 1. The sealing material feeder 1 is arranged inside the sealing material container 2 and is fixed to the bottom of the sealing material feeder 1 by a spring provided in the sealing material container 2. The sealing material 1a is inserted into the sealing material container 2 up to the level of 1b. The sealing material container 2 is fixed to the upper table of the vibration device 3.
【０００９】前記封口材供給器１は、図３に示すように
封口材の出入口７を有する外枠８により構成されてお
り、その上端面はフィルタＦの所定の貫通孔に封口材を
供給する封口材供給口９が所定数だけ設けられている基
板４が載置されている。この封口材供給口９は、例えば
金属板の基板４に所定の貫通孔にゴム管１１を挿填した
構造である。ハニカムフィルタＦは外枠に沿って降下
し、フィルタＦの端面と基板とは密着する。ただ、前記
封口材供給口９はフィルタＦの端面部と密着する面より
も若干、突出した構造となっている。As shown in FIG. 3, the sealing material feeder 1 is composed of an outer frame 8 having a sealing material inlet / outlet 7, and its upper end surface supplies the sealing material to a predetermined through hole of the filter F. A substrate 4 on which a predetermined number of sealing material supply ports 9 are provided is placed. The sealing material supply port 9 has, for example, a structure in which a rubber tube 11 is inserted into a predetermined through hole in a metal plate substrate 4. The honeycomb filter F descends along the outer frame, and the end face of the filter F and the substrate come into close contact with each other. However, the sealing material supply port 9 has a structure slightly protruding from the surface that comes into close contact with the end face portion of the filter F.
【００１０】封口材容器２を振動により封口材を流動化
し、この中に前記封口材供給器１を浸漬すると、封口材
は外枠８の封口材の出入口７より封口材供給器１内に浸
入し、基板４に設けられている管体（ゴム管５）から封
口材が自動的に吸い上げられてハニカムフィルタＦの所
定の貫通孔内に排出される。排出される封口材の量は封
口材の液面に対するハニカムフィルタＦの下端面の浸漬
深さ、浸漬時間および封口材粘度等により決まる。例え
ば、ハニカムフィルタＦの端部貫通孔内に５ｍｍ充填す
る場合にはハニカムフィルタＦの下端面浸漬深さを１０
ｍｍ程度にし、封口材粘度１５万ｃ．ｐで浸漬時間は３
ｓｅｃ〜１０ｓｅｃで良い。以上のように前記の各要因
を変えることによって所定の封口が瞬時で行うことが出
来る画期的な方法である。When the sealing material container 2 is vibrated to fluidize the sealing material and the sealing material feeder 1 is immersed therein, the sealing material enters the sealing material feeder 1 through the inlet / outlet 7 of the sealing material of the outer frame 8. Then, the sealing material is automatically sucked up from the tubular body (rubber tube 5) provided on the substrate 4 and discharged into the predetermined through hole of the honeycomb filter F. The amount of the sealing material discharged is determined by the immersion depth of the lower end surface of the honeycomb filter F with respect to the liquid surface of the sealing material, the immersion time, the viscosity of the sealing material, and the like. For example, when the end through holes of the honeycomb filter F are filled with 5 mm, the immersion depth of the lower end surface of the honeycomb filter F is 10 mm.
mm, and the sealing material viscosity is 150,000 c. soaking time is 3
It may be sec to 10 sec. As described above, this is an epoch-making method in which the predetermined sealing can be performed instantaneously by changing the above factors.
【００１１】[0011]
実施例１ 本実施例では多孔質セラミックを原料として、長さ１
５．０ｃｍ、外径１４．０ｃｍのハニカム成形体Ｆ（貫
通孔Ｈのピッチが１．５ｍｍ）を押し出し成形によって
製造した成形体を乾燥したものを被封口体とした。封口
用封口材としては、平均粒子径が０．３μｍのβ−Ｓｉ
Ｃ３０重量部に平均粒子径が１５μｍのα−ＳｉＣ７０
重量部に対して、α−テレピネオ−ルとエチルセルロ−
スとより成るバインダ−３０重量部を配合した封口材を
粘度１５万Ｃ．Ｐに調整したものを用いた。次いで、図
２の装置を用いてハニカムフィルタＦ端面の封口材内浸
漬深さを１０ｍｍ、浸漬時間５ｓｅｃとした。尚、振動
装置の周波数６０Ｈｚ、振巾３ｍｍで振動の傾斜度は上
下動に対して約３０°偏心していた。このようにして得
た封口体をアルゴン雰囲気下で２，２００℃、４時間の
焼成により、所望のハニカムフィルタＦを得た。Example 1 In this example, a length of 1
A molded body produced by extrusion-molding a honeycomb molded body F (having a pitch of through holes H of 1.5 mm) having a diameter of 5.0 cm and an outer diameter of 14.0 cm was used as a sealed body. As a sealing material for sealing, β-Si having an average particle diameter of 0.3 μm
Α-SiC70 having an average particle diameter of 15 μm in 30 parts by weight of C
With respect to parts by weight, α-terpineol and ethyl cellulose
The sealing material containing 30 parts by weight of a binder composed of The one adjusted to P was used. Then, using the apparatus of FIG. 2, the immersion depth of the end face of the honeycomb filter F in the sealing material was 10 mm and the immersion time was 5 sec. In addition, when the frequency of the vibration device was 60 Hz and the amplitude was 3 mm, the inclination of vibration was eccentric about 30 ° with respect to the vertical movement. The sealing body thus obtained was fired in an argon atmosphere at 2,200 ° C. for 4 hours to obtain a desired honeycomb filter F.
【００１２】[0012]
【発明の効果】本発明の封口方法によって製造されたフ
ィルタＦでは、所定の各貫通孔Ｈ内に正確に封口膜が形
成されており、フィルタ・セル壁との密着性が良好な事
が確認できた。In the filter F manufactured by the sealing method of the present invention, it is confirmed that the sealing film is accurately formed in each of the predetermined through holes H, and that the adhesion with the filter / cell wall is good. did it.
【図１】本発明方法によって封口されるハニカムフィル
タの一部切欠側面図FIG. 1 is a partially cutaway side view of a honeycomb filter sealed by the method of the present invention.
【図２】本発明方法において使用される封口装置の説明
図FIG. 2 is an explanatory view of a sealing device used in the method of the present invention.
【図３】封口装置における封口材供給装置[Fig. 3] Sealing material supply device in the sealing device
１ 封口材供給装置 ２ 封口材容器 ３ 振動装置 ４ 基板 ５ ゴム管 ６ 昇降装置 ７ 封口材の出入口 ８ 外枠 ９ 封口材供給口 1 Sealing Material Supply Device 2 Sealing Material Container 3 Vibration Device 4 Substrate 5 Rubber Tube 6 Elevating Device 7 Sealing Material Inlet / Outlet 8 Outer Frame 9 Sealing Material Supply Port
Claims (3)
複数の貫通孔のうち所定の貫通孔を封口するに際し、封
口すべき貫通孔に挿入する管体を突設した基板を有する
封口供給器を用い、該管体をハニカムフィルタの端部開
口部に挿入してハニカムフィルタの端部開口部と封口材
供給器の基板とを密着させ、封口材供給器中に供給され
た封口材中にハニカムフィルタを浸漬することにより所
定の貫通孔の端面を封口することを特徴とするハニカム
フィルタの封口方法。1. A sealing feeder having a substrate provided with a projecting tube body to be inserted into a through hole to be sealed at the time of sealing a predetermined through hole among a plurality of through holes provided in a porous honeycomb filter. Using the tubular body inserted into the end opening of the honeycomb filter to bring the end opening of the honeycomb filter into close contact with the substrate of the sealing material feeder, and the honeycomb in the sealing material supplied into the sealing material feeder. A method for sealing a honeycomb filter, characterized in that an end surface of a predetermined through hole is sealed by immersing the filter.
口材容器に振動を与えて封口材容器中の封口材を流動化
し、該封口材の所定容量を封口材供給器に供給するよう
にした請求項第１項記載のハニカムフィルタの封口方
法。2. A sealing material feeder is housed in a sealing material container, the sealing material container is vibrated to fluidize the sealing material in the sealing material container, and a predetermined volume of the sealing material is supplied to the sealing material feeder. The method for sealing a honeycomb filter according to claim 1, which is configured as described above.
に際し、封口材を加振することを特徴とする請求項第１
項記載のハニカムフィルタの封口方法。3. The sealing material is vibrated when the honeycomb filter is immersed in the sealing material.
Item 8. A method for sealing a honeycomb filter according to item.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4347901A JPH06190218A (en) | 1992-12-28 | 1992-12-28 | Method for sealing honeycomb filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4347901A JPH06190218A (en) | 1992-12-28 | 1992-12-28 | Method for sealing honeycomb filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06190218A true JPH06190218A (en) | 1994-07-12 |
Family
ID=18393375
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4347901A Pending JPH06190218A (en) | 1992-12-28 | 1992-12-28 | Method for sealing honeycomb filter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06190218A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007203628A (en) * | 2006-02-02 | 2007-08-16 | Ngk Insulators Ltd | Manufacturing method of sealed honeycomb structure and sealed honeycomb structure obtained thereby |
| WO2008078463A1 (en) | 2006-12-27 | 2008-07-03 | Ngk Insulators, Ltd. | Process for producing plugged honeycomb structure |
| WO2008081654A1 (en) | 2007-01-05 | 2008-07-10 | Ngk Insulators, Ltd. | Method for manufacturing sealing honeycomb structure |
| WO2008087783A1 (en) | 2007-01-18 | 2008-07-24 | Ngk Insulators, Ltd. | Method for manufacturing sealed honeycomb structure |
| WO2008114637A1 (en) | 2007-03-20 | 2008-09-25 | Ngk Insulators, Ltd. | Method of producing sealed honeycomb structure |
| WO2009088078A1 (en) * | 2008-01-10 | 2009-07-16 | Ngk Insulators, Ltd. | Production method of sealing honeycomb structure |
| WO2009088079A1 (en) * | 2008-01-10 | 2009-07-16 | Ngk Insulators, Ltd. | Production method of sealing honeycomb structure |
-
1992
- 1992-12-28 JP JP4347901A patent/JPH06190218A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007203628A (en) * | 2006-02-02 | 2007-08-16 | Ngk Insulators Ltd | Manufacturing method of sealed honeycomb structure and sealed honeycomb structure obtained thereby |
| US8052911B2 (en) | 2006-02-02 | 2011-11-08 | Ngk Insulators, Ltd. | Method for manufacturing plugged honeycomb structure |
| WO2008078463A1 (en) | 2006-12-27 | 2008-07-03 | Ngk Insulators, Ltd. | Process for producing plugged honeycomb structure |
| WO2008081654A1 (en) | 2007-01-05 | 2008-07-10 | Ngk Insulators, Ltd. | Method for manufacturing sealing honeycomb structure |
| US7638086B2 (en) | 2007-01-05 | 2009-12-29 | Ngk Insulators, Ltd. | Manufacturing method of plugged honeycomb structure |
| JP5345400B2 (en) * | 2007-01-05 | 2013-11-20 | 日本碍子株式会社 | Method for manufacturing plugged honeycomb structure |
| WO2008087783A1 (en) | 2007-01-18 | 2008-07-24 | Ngk Insulators, Ltd. | Method for manufacturing sealed honeycomb structure |
| US7736581B2 (en) | 2007-01-18 | 2010-06-15 | Ngk Insulators, Ltd. | Manufacturing method of plugged honeycomb structure |
| WO2008114637A1 (en) | 2007-03-20 | 2008-09-25 | Ngk Insulators, Ltd. | Method of producing sealed honeycomb structure |
| US8003035B2 (en) | 2007-03-20 | 2011-08-23 | Ngk Insulators, Ltd. | Method of manufacturing plugged honeycomb structure |
| WO2009088078A1 (en) * | 2008-01-10 | 2009-07-16 | Ngk Insulators, Ltd. | Production method of sealing honeycomb structure |
| WO2009088079A1 (en) * | 2008-01-10 | 2009-07-16 | Ngk Insulators, Ltd. | Production method of sealing honeycomb structure |
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