JPH0327251B2 - - Google Patents
Info
- Publication number
- JPH0327251B2 JPH0327251B2 JP4966187A JP4966187A JPH0327251B2 JP H0327251 B2 JPH0327251 B2 JP H0327251B2 JP 4966187 A JP4966187 A JP 4966187A JP 4966187 A JP4966187 A JP 4966187A JP H0327251 B2 JPH0327251 B2 JP H0327251B2
- Authority
- JP
- Japan
- Prior art keywords
- filter layer
- raw material
- filter
- manufacturing
- average pore
- 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.)
- Expired
Links
- 239000002994 raw material Substances 0.000 claims description 38
- 239000000919 ceramic Substances 0.000 claims description 22
- 239000011148 porous material Substances 0.000 claims description 19
- 238000004804 winding Methods 0.000 claims description 12
- 238000004519 manufacturing process Methods 0.000 claims description 11
- 239000002245 particle Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 9
- 239000012530 fluid Substances 0.000 claims description 3
- 230000035939 shock Effects 0.000 description 8
- 239000011230 binding agent Substances 0.000 description 7
- 239000002002 slurry Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 238000007796 conventional method Methods 0.000 description 3
- 229910052878 cordierite Inorganic materials 0.000 description 3
- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 description 3
- 230000000873 masking effect Effects 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 239000002390 adhesive tape Substances 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 229920000609 methyl cellulose Polymers 0.000 description 2
- 239000001923 methylcellulose Substances 0.000 description 2
- 235000010981 methylcellulose Nutrition 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229920000298 Cellophane Polymers 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052863 mullite Inorganic materials 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
Landscapes
- Filtering Materials (AREA)
- Laminated Bodies (AREA)
- Porous Artificial Stone Or Porous Ceramic Products (AREA)
- Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
- Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
Description
〔産業上の利用分野〕
本発明は複層セラミツクスフイルタの製造法に
関する。
〔従来技術〕
セラミツクスフイルタはその耐熱性を利用して
高温雰囲気中のダスト等微粒浮遊物を捕集する目
的で使用されることが多いが、目詰り等により圧
損失が大きくなるため低圧損化が要求される。
これに対処するには、フイルタの主成分である
骨材の粒子を大きくして平均気孔径を大きくする
ことが考えられるが、低圧損化が達成される反面
微粒浮遊物を捕集する機能を損なう。このため、
一般には平均気孔径を相違させた捕集機能の異な
る複数のフイルタ層を備えたセラミツクスフイル
タ、すなわち所定の平均気孔径を有するセラミツ
クス製の筒状の第１のフイルタ層と、この第１の
フイルタ層の外周または内周に貼着され同フイル
タ層の平均気孔径より小さい平均粒径の骨材を主
成分とし同フイルタ層の平均気孔径より小さい平
均気孔径を有するセラミツクス製の第２のフイル
タ層を備えたセラミツクスフイルタが使用されて
いる。以下、かかるセラミツクスフイルタを複層
セラミツクスフイルタという。
しかして、上記した複層セラミツクスフイルタ
を製造する場合第１のフイルタ層に第２のフイル
タ層を貼着する手段として、第２のフイルタ層の
原料である主成分の骨材およびこれを結合するた
めの無機または有機の結合材をスラリー状に調整
し、このスラリー状原料を第１のフイルタ層に刷
毛塗りまたは吹付けするか、同原料中に第１のフ
イルタ層を浸漬する手段が採られている。
〔発明が解決しようとする問題点〕
ところで、かかる複層セラミツクスフイルタに
おいては、第１のフイルタ層の平均気孔径に比し
第２のフイルタ層の平均気孔径が小さいことか
ら、同フイルタ層の原料中主成分である骨材とし
て第１のフイルタ層の平均気孔径より小さい粒径
のものが用いられる。このため、原料をスラリー
状にして第１のフイルタ層に付与すると、(1)骨材
が第１のフイルタ層内に侵入して同フイルタ層の
平均気孔径を変化させるとともに、意図した第２
のフイルタ層が形成されない。また、(2)スラリー
中に溶解または分散している結合材は第１のフイ
ルタ層の平均気孔径に関係なく毛細管現象により
同フイルタ層内に吸着され、第２のフイルタ層の
形成に悪影響を及ぼす。
これらの問題に対処するため、第１のフイルタ
層の部位に溶融塩、有機物等を一時的に付与して
マスキングした後、上記したスラリー状原料を当
該部位に付与して第２のフイルタ層を形成し、そ
の後マスキング材を除去する手段が提案されてい
る。かかる手段を採用すれば、上記した(1)、(2)の
問題点は解決されるものの、両フイルタ層間の結
合力が弱いため高温雰囲気での使用中の耐熱衝撃
性が低くなるという新たな問題が生じる。
従つて、本発明の主たる目的は、上記した(1)、
(2)の問題点を解決するとともに両フイルタ層の結
合力が大きくて耐熱衝撃性の優れた複層セラミツ
クスフイルタを提供することにある。
〔問題点を解決するための手段〕
本発明はかかる目的を達成すべく上記した複層
セラミツクスフイルタの製造法において、前記第
１のフイルタ層の外周または内周に少くとも一対
の所定厚みを有する凸部を同フイルタ層の長手方
向に離間して設け、一方前記第２のフイルタ層の
原料を100ポイズ以上の粘度の流動体に調整して
前記第１のフイルタ層における前記両凸部間に付
与して、同原料を前記第１のフイルタ層に均一な
厚みに貼着させることを特徴とするものである。
本発明において前記凸部はテープ、リング等に
より形成されるが、テープを使用する場合には同
テープは第１のフイルタ層の外周または内周の所
定の部位に容易に貼着されかつ容易に剥離される
ものであることが好ましく、プラスチツク製、紙
製、セロフアン製等各種材質の接着テープが使用
される。また、テープの幅、テープの巻回厚み、
各テープの巻回部位の間隔等は何等限定されるも
のではないが、第１のフイルタ層の長手方向の少
くとも２箇所に巻介することが必要である。但
し、これら各テープの巻回厚みは略同一であるこ
とが必要である。また、リングについては前記テ
ープと同様の材質のものまたは金属製のもので、
その幅、厚み、間隔等は何等限定されるものでは
ない。
第１図には、第１のフイルタ層（以下第１フイ
ルタ層１１という）の長手方向の２箇所にテープ
１２ａ，１２ｂを巻回した状態が示されており、
各テープ１２ａ，１２ｂの幅は後処理等を考慮す
れば狭い方がよく、好ましくは10〜30mmである。
各テープ１２ａ，１２ｂの巻回厚みt1は第２図、
第３図に示す第２のフイルタ層（以下第２フイル
タ層１３という）の厚みt2により一定の値（t1≒
t2）に決定されるが、巻回厚みt1が0.1mm未満の場
合は第２フイルタ層１３の厚みt2のバラツキが大
きくなるため、巻回厚みt1は0.1mm以上好ましく
は0.3mm以上である。隣接する各テープ１２ａ，
１２ｂの巻回部位の間隔ｌは第１フイルタ層１１
の長手方向の曲り度合に関係し、曲りの程度が無
視し得る範囲に間隔ｌを決定する。外径50〜200
mm、長さ1000〜2000mm程度の通常の第１フイルタ
層においては、例えば各テープの巻回部位の間隔
ｌを約300mmとし３〜７箇所にテープを巻回する。
第２フイルタ層１３を形成する原料は第１フイ
ルタ層１１の主成分と同様アルミナ、シリカーア
ルミナ、ムライト、コージエライト、ジルコニア
等からなる骨材を主成分とし、これに骨材間を結
合させるフリツト等無機結合材、原料の可塑性を
調整するメチルセルロース等有機結合材および水
を加えて混練して作製する。かかる原料におい
て、骨材の平均粒径は第２フイルタ層１３の平均
気孔径に密度に関係し、同平均気孔径との関係で
第１フイルタ層１１の平均気孔径より小さい粒径
のものが使用される。本発明において原料の粘度
は極めて重要な要因であり、第１フイルタ層１１
へ原料を付与したとき同原料中の各成分が第１フ
イルタ層１１内へ多数侵入するのを阻止し、かつ
所定の厚みの第２フイルタ層１３を形成するに
は、少くとも100ポイズの粘度の流動体であるこ
とが必要である。但し、粘度が3000ポイズを越え
ると原料が硬くなりすぎて第１フイルタ層１１に
均一に付与し得なくなるため、原料の粘度は100
〜3000ポイズの範囲であることが好ましい。
このように作製した原料１３Ａは、第１フイル
タ層１１における各テープの巻回部位間１１ａに
付与される。この場合、第１フイルタ１１を回転
可能に支持して手動または自動的に回転させ、こ
の状態で第２図に示すように原料１３Ａを付与
し、かつ第１フイルタ層１１の長手方向に沿つて
延びるスクレーパ１４を両テープ１２ａ，１２ｂ
上に摺接させる。これにより、スクレーパ１４は
付与された原料１３Ａを第１フイルタ層１１の巻
回部位間１１ａの周面に圧着し、余分の原料１３
Ａを掻き取つて第３図に示すように両テープ１２
ａ，１２ｂの巻回厚みt1と約同じ厚みの第２フイ
ルタ層１３を形成する。その後各テープ１２ａ，
１２ｂを取除けば第１フイルタ層１１における第
２フイルタ層１３の両側部１１ｂ，１１ｃが露呈
する。その後、第３図に示す複層構造物を加熱乾
燥して第２フイルタ層１３を硬化すればそれ自体
フイルタとして使用することができ、また第１フ
イルタ層１１の両側部１１ｂ，１１ｃにさらに原
料１３Ａを上記と同様に付与し、スクレーパ１４
で処理した後加熱乾燥すれば、第１フイルタ層１
１の全外周に第２フイルタ層１３が貼着されたフ
イルタとして使用することができ、さらにまたこ
れら各フイルタを常法により焼成してフイルタと
してもよい。なお、第１フイルタ層１１の内孔１
１ｄが大径である場合には、同フイルタ層１１の
内周に第２フイルタ層１３を貼着することが可能
である。
なお、第４図にはテープ１２ａ，１２ｂに換え
て一対のリング１２ｃ，１２ｄを第１フイルタ層
１１の外周に嵌装してフイルタを製造する例を示
し、第５図にはスクレーパ１４に換えてローラー
１５を採用した例を示し、また第６図には他のス
クレーパ１６を採用した例を示している。このス
クレーパ１６においては、その一側縁部に所定幅
で所定深さの凹所１６ａを備えている。
〔発明の作用・効果〕
このような製造法を採用すれば、第１フイルタ
層に第２のフイルタ層の原料を付与した場合同原
料中の各成分が第１フイルタ層内に侵入すること
がなく、第１フイルタ層の平均気孔径が変化する
ことがないとともに意図した第２フイルタ層が形
成される。また、第１フイルタ層に付与された原
料をスクレーパ、ローラーで処理する際同スクレ
ーパからの圧力により第１フイルタ層と原料中の
骨材がこれらの接触境界にて互いに絡み合つて密
着強度を高めるため、第１フイルタ層と第２フイ
ルタ層との結合力が高く耐熱衝撃性の高いフイル
タとなる。
〔実施例〕
コージエライトを骨材とし平均気孔径400μｍ
を有する外径120mm、内径100mm、長さ1000mmの円
筒状セラミツクスを第１フイルタ層とし、同フイ
ルタ層の長手方向の曲り度合をゲージで測定して
最大曲り0.1mmの範囲を間隔ｌとする。本実施例
においては、第１フイルタ層の長手方向の５箇所
の部位に幅20mmのテープを0.3mmの厚みになるよ
う巻回した。一方、第２フイルタ層の原料として
骨材である平均粒径120μｍのコージエライト55
Kg、無機結合材である平均粒径5μのフリツト10
Kg、有機結合材であるメチルセルローズ４Kgを用
い、これらに水を30Kgを加えて混練して粘度を
700ポイズに調整した。この原料を図面に示す手
段により第１フイルタ層における各テープの巻回
部位の間に付与してスクレーパで処理し、各テー
プを取除いて120℃で30分間加熱乾燥した。次い
で、各テープを取除いた部位に上記と同様に原料
を付与してスクレーパで処理し、加熱乾燥後常法
により焼成して複層セラミツクスフイルタを得
た。これを本発明品と称する。
また、第２フイルタ層の原料として上記原料と
同じ組成でスラリー状に作製したものを用い、こ
のスラリー状原料を上記した第１フイルタ層の外
周に浸漬法により付与して厚さ0.3mmの第２フイ
ルタ層を形成し、その後常法により加熱乾燥、焼
成して複層セラミツクスフイルタを得た。これを
従来品（）と称する。また、かかる方法におい
て、第１フイルタ層を予じめ有機結合材でマスキ
ングした状態でスラリー状原料を付与し、その後
上記と同様にしてセラミツクスフイルタを得た。
これを従来品（）と称する。
このようにして、製造された３種類の試料につ
いて圧損失および耐熱衝撃性の試験を行い、第１
表に示す結果を得た。圧損失試験は常温の空気を
６ｍ／秒の流速で濾過することにより行ない、ま
た耐熱衝撃性試験は常温下800℃の熱風を急激に
５分間透過させることを２回繰返すことにより行
ない、クラツク発生の有（×）、無（○）をチエ
ツクした。
[Industrial Field of Application] The present invention relates to a method for manufacturing a multilayer ceramic filter. [Prior art] Ceramic filters are often used to capture fine particles such as dust in high-temperature atmospheres by taking advantage of their heat resistance, but because pressure loss increases due to clogging, it is difficult to reduce pressure loss. is required. To deal with this, it is possible to increase the average pore size by increasing the size of the aggregate particles, which are the main component of the filter, but while this achieves lower pressure loss, it also reduces the ability to collect fine suspended particles. spoil. For this reason,
In general, a ceramic filter is equipped with a plurality of filter layers having different average pore diameters and different collection functions, that is, a cylindrical first filter layer made of ceramics having a predetermined average pore diameter, and a ceramic filter layer having a predetermined average pore diameter. A second filter made of ceramics, which is attached to the outer periphery or inner periphery of the layer and whose main component is aggregate having an average particle diameter smaller than the average pore diameter of the filter layer, and which has an average pore diameter smaller than the average pore diameter of the filter layer. Ceramic filters with layers are used. Hereinafter, such a ceramic filter will be referred to as a multilayer ceramic filter. Therefore, when manufacturing the above-mentioned multilayer ceramic filter, as a means for adhering the second filter layer to the first filter layer, the main component aggregate, which is the raw material of the second filter layer, and the aggregate are bonded together. A method is adopted in which an inorganic or organic binder is prepared in the form of a slurry, and this slurry-like raw material is brushed or sprayed onto the first filter layer, or the first filter layer is immersed in the same raw material. ing. [Problems to be Solved by the Invention] By the way, in such a multilayer ceramic filter, since the average pore diameter of the second filter layer is smaller than that of the first filter layer, As the aggregate which is the main component in the raw material, one having a particle size smaller than the average pore size of the first filter layer is used. For this reason, when the raw material is made into a slurry and applied to the first filter layer, (1) the aggregate invades into the first filter layer and changes the average pore diameter of the same filter layer, and
No filter layer is formed. In addition, (2) the binder dissolved or dispersed in the slurry is adsorbed into the first filter layer by capillary action regardless of the average pore diameter of the first filter layer, which adversely affects the formation of the second filter layer. affect In order to deal with these problems, after masking the first filter layer by temporarily applying molten salt, organic matter, etc., the above slurry-like raw material is applied to the part to form the second filter layer. A method has been proposed in which the masking material is formed and then the masking material is removed. If such a method is adopted, problems (1) and (2) above are solved, but a new problem arises in that the bonding force between both filter layers is weak, resulting in lower thermal shock resistance during use in a high-temperature atmosphere. A problem arises. Therefore, the main purpose of the present invention is to achieve the above-mentioned (1).
It is an object of the present invention to provide a multilayer ceramic filter that solves the problem (2) and has a large bonding force between both filter layers and excellent thermal shock resistance. [Means for Solving the Problems] To achieve the above object, the present invention provides a method for manufacturing a multilayer ceramic filter as described above, in which the first filter layer has at least one pair of predetermined thicknesses on the outer periphery or the inner periphery. The convex portions are provided spaced apart in the longitudinal direction of the filter layer, and the raw material for the second filter layer is adjusted to a fluid having a viscosity of 100 poise or more, and the convex portions are provided between the convex portions of the first filter layer. The method is characterized in that the raw material is applied to the first filter layer to have a uniform thickness. In the present invention, the convex portion is formed by a tape, a ring, etc., but when a tape is used, the tape can be easily attached to a predetermined portion on the outer periphery or inner periphery of the first filter layer. It is preferable that the adhesive tape is removable, and adhesive tapes made of various materials such as plastic, paper, and cellophane are used. In addition, the width of the tape, the winding thickness of the tape,
Although the interval between the winding parts of each tape is not limited in any way, it is necessary that the tape be wound at at least two places in the longitudinal direction of the first filter layer. However, it is necessary that the winding thickness of each of these tapes be approximately the same. In addition, the ring is made of the same material as the tape or made of metal,
The width, thickness, interval, etc. are not limited in any way. FIG. 1 shows a state in which tapes 12a and 12b are wound around two locations in the longitudinal direction of the first filter layer (hereinafter referred to as the first filter layer 11).
The width of each tape 12a, 12b is preferably narrower in consideration of post-processing and the like, and is preferably 10 to 30 mm.
The winding thickness t1 of each tape 12a, 12b is shown in FIG.
Depending on the thickness t 2 of the second filter layer (hereinafter referred to as the second filter layer 13) shown in FIG .
t 2 ), but if the winding thickness t 1 is less than 0.1 mm, the variation in the thickness t 2 of the second filter layer 13 will increase, so the winding thickness t 1 is 0.1 mm or more, preferably 0.3 mm. That's all. Each adjacent tape 12a,
The interval 1 between the winding parts 12b is the same as that of the first filter layer 11.
The interval 1 is related to the degree of curvature in the longitudinal direction and is determined within a range where the degree of curvature can be ignored. Outer diameter 50~200
In a typical first filter layer having a length of about 1,000 to 2,000 mm, the tape is wound at 3 to 7 locations, for example, with an interval 1 between each tape winding region of about 300 mm. The raw material for forming the second filter layer 13 is mainly composed of aggregates made of alumina, silica alumina, mullite, cordierite, zirconia, etc., similar to the main components of the first filter layer 11, and a frit to bond the aggregates together. It is prepared by adding and kneading an inorganic binder such as an organic binder such as methyl cellulose that adjusts the plasticity of the raw material, and water. In such a raw material, the average particle size of the aggregate is related to the density and the average pore size of the second filter layer 13, and in relation to the same average pore size, the aggregate has a smaller particle size than the average pore size of the first filter layer 11. used. In the present invention, the viscosity of the raw material is an extremely important factor, and the first filter layer 11
In order to prevent a large number of components in the raw material from entering the first filter layer 11 when the raw material is applied to the raw material, and to form the second filter layer 13 with a predetermined thickness, the viscosity is at least 100 poise. It is necessary to be a fluid. However, if the viscosity exceeds 3000 poise, the raw material becomes too hard and cannot be uniformly applied to the first filter layer 11, so the viscosity of the raw material is 100 poise.
It is preferably in the range of ~3000 poise. The raw material 13A produced in this manner is applied between the winding portions 11a of each tape in the first filter layer 11. In this case, the first filter 11 is rotatably supported and rotated manually or automatically, and in this state, the raw material 13A is applied as shown in FIG. The extending scraper 14 is attached to both tapes 12a and 12b.
Slide it onto the top. As a result, the scraper 14 presses the applied raw material 13A onto the circumferential surface of the first filter layer 11 between the winding parts 11a, and the excess raw material 13
Scrape off A and attach both tapes 12 as shown in Figure 3.
The second filter layer 13 is formed to have approximately the same thickness as the winding thickness t 1 of the layers a and 12b. After that, each tape 12a,
When 12b is removed, both sides 11b and 11c of the second filter layer 13 in the first filter layer 11 are exposed. Thereafter, if the multilayer structure shown in FIG. 3 is heated and dried to harden the second filter layer 13, it can be used as a filter itself. 13A in the same manner as above, scraper 14
If the treatment is heated and dried, the first filter layer 1
The second filter layer 13 can be used as a filter having the second filter layer 13 adhered to the entire outer periphery of the filter.Furthermore, each of these filters may be fired by a conventional method to produce a filter. Note that the inner hole 1 of the first filter layer 11
When 1d has a large diameter, it is possible to attach the second filter layer 13 to the inner circumference of the filter layer 11. 4 shows an example of manufacturing a filter by fitting a pair of rings 12c and 12d around the outer periphery of the first filter layer 11 instead of the tapes 12a and 12b, and FIG. FIG. 6 shows an example in which a scraper 15 is used, and FIG. 6 shows an example in which another scraper 16 is used. This scraper 16 is provided with a recess 16a having a predetermined width and a predetermined depth on one side edge thereof. [Operations and effects of the invention] If such a manufacturing method is adopted, when the raw material for the second filter layer is applied to the first filter layer, each component in the raw material will not invade into the first filter layer. Therefore, the average pore diameter of the first filter layer does not change, and the intended second filter layer is formed. In addition, when the raw material applied to the first filter layer is processed with a scraper or roller, the pressure from the scraper causes the aggregate in the first filter layer and the raw material to intertwine with each other at the contact boundary, increasing the adhesion strength. Therefore, the bonding force between the first filter layer and the second filter layer is high, resulting in a filter with high thermal shock resistance. [Example] Cordierite used as aggregate, average pore diameter 400μm
A cylindrical ceramic having an outer diameter of 120 mm, an inner diameter of 100 mm, and a length of 1000 mm is used as the first filter layer, and the degree of curvature in the longitudinal direction of the filter layer is measured with a gauge, and the range of maximum curvature of 0.1 mm is defined as the interval l. In this example, tapes having a width of 20 mm were wound to a thickness of 0.3 mm at five locations in the longitudinal direction of the first filter layer. On the other hand, as the raw material for the second filter layer, cordierite 55 with an average particle size of 120 μm is used as an aggregate.
Kg, frit 10 with an average particle size of 5μ, which is an inorganic binder
Kg, 4Kg of methyl cellulose, which is an organic binder, was added to 30Kg of water and kneaded to adjust the viscosity.
Adjusted to 700 poise. This raw material was applied between the wound portions of each tape in the first filter layer by the means shown in the drawings and treated with a scraper, and each tape was removed and dried by heating at 120° C. for 30 minutes. Next, a raw material was applied to the area from which each tape was removed in the same manner as above, treated with a scraper, heated and dried, and then fired by a conventional method to obtain a multilayer ceramic filter. This is called the product of the present invention. In addition, as a raw material for the second filter layer, a slurry prepared with the same composition as the above raw material was used, and this slurry raw material was applied to the outer periphery of the first filter layer by a dipping method to form a 0.3 mm thick layer. Two filter layers were formed, and then heated, dried and fired by a conventional method to obtain a multilayer ceramic filter. This is called the conventional product (). Further, in this method, a slurry-like raw material was applied with the first filter layer masked in advance with an organic binder, and then a ceramic filter was obtained in the same manner as above.
This is called the conventional product (). Pressure loss and thermal shock resistance tests were conducted on the three types of samples produced in this way.
The results shown in the table were obtained. The pressure loss test was carried out by filtering air at room temperature at a flow rate of 6 m/sec, and the thermal shock resistance test was carried out by rapidly passing hot air at 800°C for 5 minutes at room temperature twice. I checked the presence (x) and absence (○).
【表】
この結果を参照すれば、従来品（）において
は耐熱衝撃性は問題ないが圧損失に問題があり、
また従来品（）においては圧損失は問題ないが
耐熱衝撃性に問題があるのに対して、本発明品に
おいては圧損失、耐熱衝撃性ともに問題がないこ
とが明らかである。
実施例 ２
第２フイルタ層の原料中骨材の粒径および粘度
を変更しかつ同フイルタ層の厚みを変更した点を
除き、第１実施例における本発明品と同じ方法に
より７種類の複層セラミツクスフイルタを得、こ
れらのフイルタについて第１実施例と同じ試験を
行つた。この結果を第２表に示す。なお、同表中
試料１のものは第１実施例の本発明品に該当す
る。[Table] Referring to this result, the conventional product () has no problem with thermal shock resistance, but has a problem with pressure loss.
Furthermore, while the conventional product () has no problem with pressure loss but has a problem with thermal shock resistance, it is clear that the product of the present invention has no problems with either pressure loss or thermal shock resistance. Example 2 Seven types of multi-layer products were manufactured using the same method as the product of the present invention in Example 1, except that the particle size and viscosity of the raw material aggregate in the second filter layer were changed and the thickness of the same filter layer was changed. Ceramic filters were obtained and the same tests as in the first example were conducted on these filters. The results are shown in Table 2. Note that Sample 1 in the same table corresponds to the product of the present invention of the first example.
第１図は外周にテープを巻回した状態の第１フ
イルタ層の斜視図、第２図は同フイルタ層に第２
フイルタ層の原料を付与している状態の概略斜視
図、第３図は第１フイルタ層の外周に部分的に第
２フイルタ層を貼着してなるフイルタの斜視図、
第４図はテープに換えてリングを採用した場合の
第２図に対応する斜視図、第５図はスクレーパに
換えてローラーを採用した場合の第２図に対応す
る斜視図、第６図は他のスクレーパを採用した場
合の第２図に対応する斜視図である。
符号の説明、１１……第１フイルタ層、１２
ａ，１２ｂ……テープ、１２ｃ，１２ｄ……リン
グ、１３……第２フイルタ層、１４，１６……ス
クレーパ、１５……ローラー。
Figure 1 is a perspective view of the first filter layer with a tape wound around its outer periphery, and Figure 2 is a perspective view of the first filter layer with tape wrapped around the outer periphery.
FIG. 3 is a perspective view of a filter in which a second filter layer is partially attached to the outer periphery of the first filter layer;
Fig. 4 is a perspective view corresponding to Fig. 2 when a ring is used instead of the tape, Fig. 5 is a perspective view corresponding to Fig. 2 when a roller is used instead of the scraper, and Fig. 6 is a perspective view corresponding to Fig. 2 when a roller is used instead of the scraper. FIG. 3 is a perspective view corresponding to FIG. 2 when another scraper is employed. Explanation of symbols, 11...first filter layer, 12
a, 12b...Tape, 12c, 12d...Ring, 13...Second filter layer, 14, 16...Scraper, 15...Roller.
Claims (1)
筒状の第１のフイルタ層と、この第１のフイルタ
層の外周または内周に貼着され同フイルタ層の平
均気孔径より小さい平均粒径の骨材を主成分とし
同フイルタ層の平均気孔径より小さい平均気孔径
を有するセラミツクス製の第２のフイルタ層を備
えたセラミツクスフイルタの製造法において、前
記第１のフイルタ層の外周または内周に少くとも
一対の所定厚みを有する凸部を同フイルタ層の長
手方向に離間して設け、一方前記第２のフイルタ
層の原料を100ポイズ以上の粘度の流動体に調整
して前記第１のフイルタ層における前記両凸部間
に付与して、同原料を前記第１のフイルタ層に均
一な厚みに貼着させることを特徴とする複層セラ
ミツクスフイルタの製造法。 ２ 前記凸部が前記第１のフイルタ層の外周また
は内周にテープを巻回して形成される特許請求の
範囲第１項に記載の製造法。 ３ 前記凸部が前記第１のフイルタ層の外周また
は内周にリングを嵌装して形成される特許請求の
範囲第１項に記載の製造法。 ４ 前記第１のフイルタ層の長手方向に沿つて延
びるスクレーパを前記両凸部上を相対的に摺動さ
せて前記原料を貼着させる特許請求の範囲第１
項、第２項または第３項に記載の製造法。 ５ 前記第１のフイルタ層の長手方向に沿つて延
びるローラーを前記両凸部上を相対的に回転させ
て前記原料を貼着させる特許請求の範囲第１項、
第２項または第３項に記載の製造法。[Claims] 1. A cylindrical first filter layer made of ceramics having a predetermined average pore diameter; A method for producing a ceramic filter comprising a second filter layer made of ceramics which is mainly composed of aggregate with a small average particle size and has an average pore diameter smaller than the average pore diameter of the filter layer, wherein the first filter layer is At least a pair of convex portions having a predetermined thickness are provided on the outer periphery or the inner periphery of the filter layer, spaced apart from each other in the longitudinal direction of the same filter layer, and on the other hand, the raw material for the second filter layer is adjusted to a fluid having a viscosity of 100 poise or more. A method for manufacturing a multilayer ceramic filter, characterized in that the same raw material is applied between the convex portions of the first filter layer to adhere the raw material to the first filter layer with a uniform thickness. 2. The manufacturing method according to claim 1, wherein the convex portion is formed by winding a tape around the outer circumference or inner circumference of the first filter layer. 3. The manufacturing method according to claim 1, wherein the convex portion is formed by fitting a ring around the outer periphery or inner periphery of the first filter layer. 4. Claim 1: A scraper extending along the longitudinal direction of the first filter layer is relatively slid on both the convex portions to adhere the raw material.
The manufacturing method according to item 1, 2 or 3. 5. Claim 1, wherein a roller extending along the longitudinal direction of the first filter layer is relatively rotated on both the convex portions to adhere the raw material.
The manufacturing method according to item 2 or 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4966187A JPS63218226A (en) | 1987-03-04 | 1987-03-04 | Manufacture of plural layer ceramics filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4966187A JPS63218226A (en) | 1987-03-04 | 1987-03-04 | Manufacture of plural layer ceramics filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63218226A JPS63218226A (en) | 1988-09-12 |
| JPH0327251B2 true JPH0327251B2 (en) | 1991-04-15 |
Family
ID=12837364
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4966187A Granted JPS63218226A (en) | 1987-03-04 | 1987-03-04 | Manufacture of plural layer ceramics filter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63218226A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5749970A (en) * | 1995-03-30 | 1998-05-12 | Ngk Insulators, Ltd. | Apparatus for coating outer peripheral surface of columnar structural body with a coating material |
| US6524421B1 (en) * | 2000-09-22 | 2003-02-25 | Praxair Technology, Inc. | Cold isopressing method |
-
1987
- 1987-03-04 JP JP4966187A patent/JPS63218226A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63218226A (en) | 1988-09-12 |
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