JPH0360522B2 - - Google Patents
Info
- Publication number
- JPH0360522B2 JPH0360522B2 JP28667686A JP28667686A JPH0360522B2 JP H0360522 B2 JPH0360522 B2 JP H0360522B2 JP 28667686 A JP28667686 A JP 28667686A JP 28667686 A JP28667686 A JP 28667686A JP H0360522 B2 JPH0360522 B2 JP H0360522B2
- Authority
- JP
- Japan
- Prior art keywords
- metal fibers
- mat
- filter element
- fiber
- diameters
- 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
- 239000000835 fiber Substances 0.000 claims description 52
- 239000002184 metal Substances 0.000 claims description 39
- 238000000034 method Methods 0.000 claims description 14
- 238000004519 manufacturing process Methods 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 8
- 230000003247 decreasing effect Effects 0.000 claims 1
- 239000011148 porous material Substances 0.000 description 8
- 238000004062 sedimentation Methods 0.000 description 7
- 238000007664 blowing Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 238000001914 filtration Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- 239000012530 fluid Substances 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 235000008331 Pinus X rigitaeda Nutrition 0.000 description 1
- 235000011613 Pinus brutia Nutrition 0.000 description 1
- 241000018646 Pinus brutia Species 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000012209 synthetic fiber Substances 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
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
- B01D39/2041—Metallic material the material being filamentary or fibrous
- B01D39/2044—Metallic material the material being filamentary or fibrous sintered or bonded by inorganic agents
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Filtering Materials (AREA)
Description
〔産業上の利用分野〕
本発明は、金属繊維焼結体からなるフイルタエ
レメントの製造方法に関する。
〔従来の技術〕
金属繊維焼結体が各種の流体に対するフイルタ
エレメントとして使用され、例えば、合成樹脂フ
イルムの製造装置或いは合成繊維の製造装置にお
ける溶融樹脂の異物除去用のフイルタエレメント
として使用されている。従来、フイルタエレメン
トとして使用される金属繊維焼結体は同一径の繊
維を使用しており、空隙は全体的に比較的均一と
なつている。
〔発明が解決しようとする問題点〕
上記金属繊維焼結体は三次元の空隙を有してお
り、フイルタエレメントとして使用すると、三次
元の空隙に異物を捕捉でき、従つて捕捉異物量が
多く、ろ過圧をあまり上昇させることなく長期間
使用できるものと考えられていた。ところが、本
発明者等が種々なろ過実験を行つた結果、上記フ
イルタエレメントは三次元空隙を有しているにも
かかわらず、主として表面に異物が堆積してケー
ク化現象を生じ、内部の空隙があまり有効に作用
しないことが判明した。また、従来より、平均空
隙径の異なるフイルタエレメントを、流体の流れ
方向に空隙径が徐々に小さくなるように積層して
使用し、径の大きい異物は上流のフイルタエレメ
ントで捕捉し、徐々に径の小さい異物を下流側の
フイルタエレメントで捕捉することによつて効率
良く異物を捕捉できることが知られている。しか
し、この場合にあつても、捕捉される異物は主と
して各フイルタエレメントの上流側表面に、従つ
て積層したフイルタエレメント間に堆積してお
り、内部の空隙があまり有効に使用されていない
ことが判明した。
このことから、金属繊維焼結体からなるフイル
タエレメントの内部空隙を有効に使用するには、
厚み方向に平均空隙径を徐々に小さくすることが
考えられる。しかしながら、従来、このように平
均空隙径が厚み方向に徐々に変化した金属繊維焼
結体を製造する方法は知られていなかつた。
しかして、本発明の目的は、平均空隙径が厚み
方向に徐々に変化した金属繊維焼結体からなるフ
イルタエレメントの製造方法を提供するにある。
〔問題点を解決するための手段〕
上記目的を達成すべく為された本発明は、直径
の異なる少なくとも２種類以上の金属繊維を液中
に分散させ、この金属繊維を沈降させてマツトを
形成し、このマツトを焼結することを特徴とする
フイルタエレメントの製造方法を要旨とする。
ここで、金属繊維の沈降中、金属繊維を分散さ
せた液はそのまま、残してもよいし、金属繊維の
沈降と同時に液を金属繊維で形成されるマツトを
通して下方に抜いてもよい。
〔作 用〕
上記したように、直径の異なる少なくとも２種
類以上の金属繊維を液中に分散させ、この金属繊
維を沈降させると、金属繊維の沈降速度はその直
径に応じて変化し、直径の大きいものは比較的早
く沈降し、直径の小さいものは遅く沈降する。こ
のため、金属繊維が堆積して形成したマツトの下
側は比較的直径の大きい金属繊維が多く、上に行
く程小さい直径の金属繊維が多くなる。従つて、
このマツトを焼結して作つたフイルタエレメント
は、厚み方向に平均繊維径が徐々に小さくなつて
おり、それに応じて平均空隙径も徐々に小さくな
つている。
ここで、複数の直径の金属繊維を用いた沈降工
程を１回行つて、所定厚さのマツトを形成しても
よいが、この代わりに、沈降工程を複数回、金属
繊維の平均繊維径を徐々に小さくして繰り返し、
所望厚さのマツトを形成してもよい。このように
沈降工程を繰り返して金属繊維のマツトを形成す
ると、マツトの厚み方向の空隙径の分布を一層大
きくすることができる。なお、沈降工程を複数回
繰り返す場合には、全部の沈降工程において、常
に異なる繊維径の金属繊維の組み合わせを使用す
る必要はなく、どれかの沈降工程では単一繊維径
の金属繊維を用いてもよい。
〔実施例〕
以下、本発明の実施例を図面を参照して説明す
る。第１図は本発明方法の実施に使用する装置の
１例を概略的に示すもので、１は抄紙槽、２は通
水性を有するすのこであり、この上に金属繊維を
堆積させるためのものである。３はすのこ２の上
方に出し入れ可能に設けられた遮蔽兼空気噴出板
であり、上面側にのみ多数の空気噴出孔４を有し
内部に空気噴出孔４に通じる空気通路５を有して
いる。６は複数個の供給タンクであり、内部に金
属繊維を分散したスラリーを収容している。な
お、図示は省略しているが、同様な供給タンクが
更に多数設けられている。供給タンク内の金属繊
維は、各供給タンク間でそれぞれ平均繊維径が異
なつており、また、少なくとも幾つかの供給タン
クには、異なる繊維径の金属繊維が混合して入れ
られている。各供給タンクに収容される金属繊維
の繊維径及び混合割合の１例としては次表の通り
である。なお、繊維径の単位はμ、繊維の長さは
2.0〜50.0mm程度である。
[Industrial Field of Application] The present invention relates to a method for manufacturing a filter element made of a sintered metal fiber body. [Prior Art] Metal fiber sintered bodies are used as filter elements for various fluids, and are used, for example, as filter elements for removing foreign matter from molten resin in synthetic resin film manufacturing equipment or synthetic fiber manufacturing equipment. . Conventionally, metal fiber sintered bodies used as filter elements use fibers of the same diameter, and the voids are relatively uniform throughout. [Problems to be Solved by the Invention] The metal fiber sintered body has three-dimensional voids, and when used as a filter element, foreign matter can be trapped in the three-dimensional voids, and the amount of trapped foreign matter is large. It was thought that it could be used for a long time without increasing the filtration pressure too much. However, as a result of various filtration experiments carried out by the present inventors, it was found that although the filter element has three-dimensional voids, foreign matter mainly accumulates on the surface, causing a caking phenomenon, and the internal voids. It turns out that it doesn't work very effectively. In addition, conventionally, filter elements with different average pore diameters are stacked in such a way that the pore diameters gradually become smaller in the direction of fluid flow. Foreign particles with large diameters are captured by the upstream filter element, and the It is known that foreign matter can be efficiently captured by capturing small foreign matter with a filter element on the downstream side. However, even in this case, the trapped foreign matter is mainly deposited on the upstream surface of each filter element, that is, between the stacked filter elements, and the internal voids are not used very effectively. found. From this, in order to effectively use the internal voids of the filter element made of sintered metal fibers,
It is conceivable to gradually reduce the average pore diameter in the thickness direction. However, conventionally, there has been no known method for producing a metal fiber sintered body in which the average pore diameter gradually changes in the thickness direction. SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a method for manufacturing a filter element made of a metal fiber sintered body in which the average pore diameter gradually changes in the thickness direction. [Means for Solving the Problems] The present invention, which has been made to achieve the above object, involves dispersing at least two or more types of metal fibers with different diameters in a liquid, and forming a mat by settling the metal fibers. The gist of the present invention is a method for manufacturing a filter element, which is characterized by sintering this mat. Here, during the settling of the metal fibers, the liquid in which the metal fibers are dispersed may be left as is, or the liquid may be drained downward through the mat formed of the metal fibers at the same time as the metal fibers are settled. [Function] As mentioned above, when at least two types of metal fibers with different diameters are dispersed in a liquid and the metal fibers are allowed to settle, the sedimentation speed of the metal fibers changes depending on the diameter, and the diameter of the metal fibers changes depending on the diameter. Larger diameter particles settle relatively quickly, while smaller diameter particles settle more slowly. For this reason, there are many metal fibers with relatively large diameters on the lower side of the pine formed by depositing metal fibers, and the metal fibers with smaller diameters increase as you go up. Therefore,
A filter element made by sintering this mat has an average fiber diameter that gradually decreases in the thickness direction, and an average pore diameter that gradually decreases accordingly. Here, the sedimentation process using metal fibers of a plurality of diameters may be performed once to form a mat of a predetermined thickness, but instead of this, the sedimentation process may be performed multiple times and the average fiber diameter of the metal fibers Gradually reduce the size and repeat
A mat of desired thickness may be formed. By repeating the sedimentation process in this manner to form a mat of metal fibers, the distribution of pore diameters in the thickness direction of the mat can be further increased. In addition, when repeating the sedimentation process multiple times, it is not necessary to always use a combination of metal fibers with different fiber diameters in all sedimentation processes, and it is not necessary to use metal fibers with a single fiber diameter in any of the sedimentation processes. Good too. [Example] Hereinafter, an example of the present invention will be described with reference to the drawings. FIG. 1 schematically shows an example of the apparatus used to carry out the method of the present invention, in which 1 is a papermaking tank, 2 is a water-permeable drainboard, on which metal fibers are deposited. It is. Reference numeral 3 denotes a shielding/air blowing plate which is provided above the drainboard 2 so as to be removable and removable, and has a large number of air blowing holes 4 only on the upper surface side, and has an air passage 5 communicating with the air blowing holes 4 inside. . Reference numeral 6 denotes a plurality of supply tanks, each of which contains a slurry in which metal fibers are dispersed. Although not shown, a large number of similar supply tanks are provided. The metal fibers in the supply tanks have different average fiber diameters among the supply tanks, and at least some of the supply tanks contain a mixture of metal fibers with different fiber diameters. An example of the fiber diameter and mixing ratio of the metal fibers accommodated in each supply tank is shown in the following table. The unit of fiber diameter is μ, and the fiber length is
It is about 2.0 to 50.0 mm.
以上の説明から明らかなように、本発明方法
は、異なる繊維径の金属繊維を液中で沈降させて
マツトを形成し、そのマツトを焼結してフイルタ
エレメントを製造するものであるので、でき上が
つたフイルタエレメントでは厚み方向に平均繊維
径が徐々に小さくなつており、それに応じて平均
空隙径も徐々に小さくなつており、きわめてろ過
特性の良いフイルタエレメントを製造することが
できるという効果を有している。
As is clear from the above explanation, the method of the present invention involves precipitating metal fibers of different fiber diameters in a liquid to form a mat, and sintering the mat to produce a filter element. The average fiber diameter of the raised filter element gradually decreases in the thickness direction, and the average pore diameter also decreases accordingly, making it possible to manufacture a filter element with extremely good filtration properties. have.
第１図は本発明方法の実施に用いる装置の１例
を概略的に示す断面図、第２図はその装置で製造
したマツトの一部を概略的に示す断面図である。
１…抄紙槽、２…すのこ、３…空気噴出板、４
…空気噴出孔、６…供給タンク、７…弁、８…金
属繊維、９…マツト。
FIG. 1 is a cross-sectional view schematically showing an example of an apparatus used to carry out the method of the present invention, and FIG. 2 is a cross-sectional view schematically showing a part of a mat manufactured using the apparatus. 1...Paper making tank, 2...Drain board, 3...Air blowing board, 4
...Air blowout hole, 6...Supply tank, 7...Valve, 8...Metal fiber, 9...Matsuto.
Claims (1)
維を液中に分散させ、この金属繊維を沈降させて
マツトを形成し、このマツトを焼結することを特
徴とするフイルタエレメントの製造方法。 ２ 前記金属繊維を沈降させる際、同時に液を金
属繊維で形成されるマツトを通して下方に抜くこ
とを特徴とする特許請求の範囲第１項記載のフイ
ルタエレメントの製造方法。 ３ 前記した直径の異なる少なくとも２種類以上
の金属繊維を液中に分散させ、この金属繊維を沈
降させる工程を、金属繊維の平均繊維径を徐々に
小さくして複数回繰り返し、マツトを形成するこ
とを特徴とする特許請求の範囲第１項記載のフイ
ルタエレメントの製造方法。[Claims] 1. A filter element characterized in that at least two types of metal fibers with different diameters are dispersed in a liquid, the metal fibers are sedimented to form a mat, and the mat is sintered. Production method. 2. The method for manufacturing a filter element according to claim 1, characterized in that when the metal fibers are sedimented, the liquid is simultaneously drawn downward through a mat formed of the metal fibers. 3. Repeating the step of dispersing at least two types of metal fibers with different diameters in a liquid and settling the metal fibers several times while gradually decreasing the average fiber diameter of the metal fibers to form a mat. A method for manufacturing a filter element according to claim 1, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28667686A JPS63141619A (en) | 1986-12-03 | 1986-12-03 | Production of filter element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28667686A JPS63141619A (en) | 1986-12-03 | 1986-12-03 | Production of filter element |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63141619A JPS63141619A (en) | 1988-06-14 |
| JPH0360522B2 true JPH0360522B2 (en) | 1991-09-17 |
Family
ID=17707521
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28667686A Granted JPS63141619A (en) | 1986-12-03 | 1986-12-03 | Production of filter element |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63141619A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2732446B2 (en) * | 1993-03-23 | 1998-03-30 | 長瀬産業株式会社 | Manufacturing method of filter media |
| DE69814610T2 (en) * | 1997-03-31 | 2004-04-01 | Fibermark, Inc. | METHOD FOR PRODUCING A WET LAYER FROM METAL FIBERS AND METAL POWDER |
| DE102005004287B4 (en) * | 2005-01-28 | 2013-06-13 | Mann + Hummel Gmbh | Oil filter unit |
| DE102007023641B4 (en) | 2007-05-22 | 2015-04-02 | Ibs Filtran Kunststoff-/ Metallerzeugnisse Gmbh | Oil filter device |
-
1986
- 1986-12-03 JP JP28667686A patent/JPS63141619A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63141619A (en) | 1988-06-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
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| EXPY | Cancellation because of completion of term |