JPS61268320A - Filter material - Google Patents
Filter materialInfo
- Publication number
- JPS61268320A JPS61268320A JP11075585A JP11075585A JPS61268320A JP S61268320 A JPS61268320 A JP S61268320A JP 11075585 A JP11075585 A JP 11075585A JP 11075585 A JP11075585 A JP 11075585A JP S61268320 A JPS61268320 A JP S61268320A
- Authority
- JP
- Japan
- Prior art keywords
- density
- filter material
- filter
- downstream side
- layer
- 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.)
- Granted
Links
- 239000000463 material Substances 0.000 title claims abstract description 52
- 238000001914 filtration Methods 0.000 claims abstract description 26
- 239000012530 fluid Substances 0.000 claims abstract description 15
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 11
- 239000000428 dust Substances 0.000 abstract description 24
- 239000002245 particle Substances 0.000 abstract description 8
- 238000000034 method Methods 0.000 abstract description 6
- 230000035515 penetration Effects 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 32
- 230000000694 effects Effects 0.000 description 9
- 239000011148 porous material Substances 0.000 description 7
- 239000000835 fiber Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 101150086731 ges-1 gene Proteins 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 239000012209 synthetic fiber Substances 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔発明の技術分野〕
本発明は濾過ｌに関し、特に内燃機関のオイルフィルタ
ーやエアーフィルターなどに好適な濾過材に関する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to filtration, and particularly to a filtration material suitable for oil filters, air filters, etc. of internal combustion engines.
自動車のオイルフィルターやエアーフィルターに使用す
る濾過材として要求される条件としては、被濾過流体中
に存在するダストなどの微粒子を効果的に除去する濾過
性能を有し、しかも長期間にわたって良好な濾過性能を
紺持し続けることが特に重要である。The requirements for a filtration material used in automobile oil filters and air filters are to have filtration performance that effectively removes dust and other particulates present in the fluid to be filtered, and to maintain good filtration over a long period of time. It is particularly important to maintain performance.
このような観点で、従来から様々な濾過材が捉案されて
いるが、濾過性能の向上とライフの長期化との双方を同
時に具備させるという点においては、従来の濾過材は必
ずしも充分満足のいくものではない。From this point of view, various filter media have been proposed in the past, but conventional filter media are not necessarily fully satisfactory in terms of simultaneously improving filtration performance and prolonging the service life. It's not something I can do.
たとえば、従来、ｍＩＩ密度の異なる濾紙を砂金させる
などして、濾紙の厚さ方向に密度勾配を設けた濾過材が
知られている（たとえば特公昭５４−４０７７８号公報
）。For example, a filter material is known in which a density gradient is provided in the thickness direction of the filter paper by, for example, depositing filter papers with different mII densities (for example, Japanese Patent Publication No. 54-40778).
これら密度勾配型濾過材は、被濾過流体の流れの上流側
から下流側の方向に、粗から密へ変化するように形成さ
れているので、低密度層で大寸法粒子を捕捉し、高密度
層で、微細粒子が捕捉されることにより、良好なふるい
分は効果とある程麿のライフの向上を図ることができる
点ですぐれているが、以下のような欠点を有している。These density gradient type filter media are formed so that the flow of the fluid to be filtered changes from coarse to dense in the direction from the upstream side to the downstream side, so the low density layer traps large particles and the high density layer Although fine particles are trapped in the layer, a good sieve fraction is excellent in that it can improve the life of the maroon to a certain degree, but it has the following drawbacks.
（イ） 従来の密度勾配型濾過材においては、濾過材を
通過する際の流速が速く、単なる接触ににるダスト付着
（捕捉）が生じにくく深層部に突きささる様に強固に捕
捉されるため（いわゆる深層濾過）、濾材の目づまりが
おこりやすく、圧力損失がいきおい増大するという問題
がある。(b) In conventional density gradient type filter media, the flow velocity when passing through the filter media is high, and dust adhesion (trapping) due to mere contact is difficult to occur, and the dust is firmly captured so that it penetrates into the deep layer. Because of this (so-called deep filtration), there is a problem that the filter medium is easily clogged and the pressure loss increases significantly.
（ロ） 従来の濾過材は、被濾過流体の上流側の濾材表
面の気孔率が大きいので、ダストが濾材の表面層内に取
り込まれやすく、このため濾材表面層上にダストケーキ
層が形成されにくいという欠点がある。したがって、ケ
ーキ層による濾過機能（すなわちプライマルフィルタ機
能）を期待することはできず、ロングライフ化を図る上
で大きな制限がある。(b) In conventional filter media, the porosity of the surface of the filter media on the upstream side of the fluid to be filtered is large, so dust is easily incorporated into the surface layer of the filter media, resulting in the formation of a dust cake layer on the surface layer of the filter media. The drawback is that it is difficult. Therefore, a filtration function (that is, a primal filter function) cannot be expected from the cake layer, and there are major limitations in achieving a long life.
本発明は、上述した点に鑑みてなされたものであり、濾
過性能とロングライフ化の双方にすぐれた濾過材を提供
することを目的とする。The present invention has been made in view of the above-mentioned points, and an object of the present invention is to provide a filter material that is excellent in both filtration performance and long life.
上記目的を達成するため、本発明の濾過材は、厚さ方向
に密度勾配を有する濾過材において、被濾過流体の流れ
の上流側が高密度で下流側が低密度であり、かつ、該下
流側の濾過材表面に、少なくとも下流側の表面密度Ｊ：
りも高い密度を有する高密度槽が形成されてなることを
特徴とする。In order to achieve the above object, the filtration material of the present invention has a density gradient in the thickness direction, and has a high density on the upstream side of the flow of the fluid to be filtered and a low density on the downstream side of the flow of the fluid to be filtered. On the surface of the filter material, at least the surface density J on the downstream side:
It is characterized by forming a high-density tank having a higher density.
以下、本発明の濾過材を添付図面に示す実施例に基づい
て詳細に説明する。EMBODIMENT OF THE INVENTION Hereinafter, the filter material of this invention will be explained in detail based on the Example shown in an accompanying drawing.
第１図の断面概念図に示すように、本発明の濾過材は、
基材１の面方向において、被濾過流体の流れ（図中の矢
印の方向）の上流側から下流側に向かって気孔２の径が
大きくなるような密度勾配を有し、さらに下流側の濾過
材表面に、基材１の＝ ３ −
上流側表面の気孔径よりも小さな気孔２を有する高密度
層が形成されている。As shown in the cross-sectional conceptual diagram of FIG. 1, the filter material of the present invention is
In the plane direction of the base material 1, there is a density gradient such that the diameter of the pores 2 increases from the upstream side to the downstream side of the flow of the fluid to be filtered (in the direction of the arrow in the figure), and further filtration is performed on the downstream side. A high-density layer having pores 2 smaller than the pore diameter of = 3 - upstream surface of the base material 1 is formed on the surface of the material.
このように、被濾過流体の入口側を密にし出口側を粗に
構成することにより、比較的大きなダスト粒子が濾過材
内部に取り込まれ捕捉されることを防止し、逆に濾過材
の表面上にダストケーキ層が形成されるのを促進する上
で大きな効果がある。In this way, by configuring the inlet side of the fluid to be filtered to be dense and the outlet side to be coarse, relatively large dust particles are prevented from being taken into and trapped inside the filter material, and conversely, they are prevented from being trapped on the surface of the filter material. has a great effect on promoting the formation of a dust cake layer.
さらに、濾過材を通過する際の流速が徐々におそくなる
傾向にあるため、密層を通過した比較的大きなダストも
濾過材内部に付着しやすくなり、しかも出口側を粗に構
成しているため、このようなゲス１−付着による流通抵
抗も大幅には増大しないという効果がある。これにより
、濾過材内部における目づまりを少なくするとともに、
表面に形成されるケーキ層による濾過作用（プライマル
フィルター機能）を利用することにより濾過性能ならび
にライフの向上を図ることができる。Furthermore, since the flow velocity when passing through the filter medium tends to gradually slow down, relatively large dust particles that have passed through the dense layer tend to adhere to the inside of the filter medium. , there is an effect that the flow resistance due to such Ges 1 adhesion does not increase significantly. This reduces clogging inside the filter material, and
By utilizing the filtration action (primal filter function) of the cake layer formed on the surface, it is possible to improve filtration performance and life.
さらに、本発明の濾過材は、下流側の基材表面に高密度
層が設けられているので、基材内部に形成されるチャン
バーの作用により、ライフの向上と圧力損失の増大防止
を図ることができる。第２図は、このチャンバー効果を
説明するための模式図である。すなりち、基材１内に侵
入したダスト４はチャンバー内をスムーズにしかも自由
に移動することができしかも気孔径が次第に大きくなる
ように構成されているので、流れ抵抗の増大を緩和する
上で有利である。さらに、高密度層３の密度は、少なく
とも前記下流側の基材表面密度よりも高いので、侵入し
たダストはチャンバー内に効果的に集積され、ダスト保
持量が増大することによってロングライフ化を図ること
ができる。Furthermore, since the filter material of the present invention has a high-density layer provided on the surface of the base material on the downstream side, the life of the filter material can be improved and pressure loss can be prevented from increasing due to the action of the chamber formed inside the base material. Can be done. FIG. 2 is a schematic diagram for explaining this chamber effect. As a result, the dust 4 that has entered the base material 1 can move smoothly and freely within the chamber, and since the pore diameter is configured to gradually increase, it is possible to alleviate the increase in flow resistance. It is advantageous. Furthermore, since the density of the high-density layer 3 is higher than at least the surface density of the base material on the downstream side, the invading dust is effectively accumulated in the chamber, and the amount of dust retained is increased, thereby achieving a longer life. be able to.
第３図に示す濾過制は、流体の入口側の基材表面に起毛
５で構成される起毛層を形成した場合の実施例である。The filtration system shown in FIG. 3 is an embodiment in which a raised layer composed of raised fibers 5 is formed on the surface of the base material on the fluid inlet side.
この起毛層によって、ダストが樹氷のように捕捉されて
起毛層上にダストケーキ層が形成されやターりなり、良
好なプライマルフィルター機能が発揮される。また、ゲ
ス１〜ケー１層と基材との間には一定の空間が形成され
るので、これによって流通抵抗の低減化を図ることがで
きる。This raised layer traps dust like ice-covered ice and forms a dust cake layer on the raised layer, thereby exhibiting a good primal filter function. Moreover, since a certain space is formed between the Gess 1 to Kay 1 layers and the base material, it is possible to reduce the flow resistance.
さらに、上記起毛５は、基材１の密層側に形成されるの
で、ケーキ層が形成された場合の起毛のへタリを防止す
る上でも有利である。Furthermore, since the nap 5 is formed on the dense layer side of the base material 1, it is also advantageous in preventing the nap from flattening when a cake layer is formed.
なお、上記起毛層は、通常、濾過材の構成繊維の端部が
濾過材表面から突起して毛羽立った状態として構成され
得る。表面からの起毛は、粗大なダスト粒子が集塵され
てダストケーキ層が形成されやすくなる程度で充分であ
り、起毛部の密度も、必ずしも芝生状の程度に密である
必要はない。たとえば、ダストの大きさが５〜７０μ程
度であるとき、ダストの大きさが５〜７０μ程度である
とき、繊維の突出部の長さは８０〜３００μであれば充
分である。In addition, the said raised layer can usually be comprised in the state where the edge part of the constituent fiber of a filter medium protrudes from the surface of a filter medium, and is fluffed. The nap from the surface is sufficient to easily collect coarse dust particles and form a dust cake layer, and the density of the nap does not necessarily have to be as dense as that of a lawn. For example, when the size of the dust is about 5-70μ, it is sufficient that the length of the protrusion of the fiber is 80-300μ.
第４図に示す濾過材は、基材１の面方向に対しても密度
勾配を設けた場合の実施例であり、基材の面方向におい
て、相対的な小さな気孔系を有する高密度部分と大きな
気孔径を有する低密度部分とが均一に分布形成されてい
る。このような構成にすることにより、ダストの捕捉を
段階的に進行させることができる。すなわち、ダスト捕
捉による目づまりは、まず高密度部分で生じ、次いで低
密度部分に移行するので、面方向の密度が一定の場合に
比べて圧力損失の急激な増大を防止することができ、一
層のロングライフ化を図ることができる。さらに、微細
粒子の除去は高密匪部分で行なわれ、大寸法粒子の除去
は低密度部分の層で行なわれやすくなるので、両層の密
度範囲ならびに面積割合を適宜選択することによっても
濾過性能の向上を図ることができる。また、面方向の密
度差は、連続的あるいは段階的に変化させてもよい。The filter medium shown in FIG. 4 is an example in which a density gradient is also provided in the plane direction of the base material 1, and in the plane direction of the base material, there is a high-density portion having a relatively small pore system. Low-density portions with large pore diameters are uniformly distributed. With such a configuration, dust can be captured in stages. In other words, clogging due to dust trapping occurs first in high-density areas and then moves to low-density areas, making it possible to prevent a sudden increase in pressure loss compared to a case where the density in the plane direction is constant. It is possible to extend the life of the product. Furthermore, since the removal of fine particles is carried out in the high-density layer, and the removal of large particles is more likely to be carried out in the lower-density layer, filtration performance can be improved by appropriately selecting the density range and area ratio of both layers. You can improve your performance. Further, the density difference in the planar direction may be changed continuously or stepwise.
第５図に示す濾過材は、第４図に示す濾過材の表面に凹
凸と起毛層を設けた場合の実施例である。The filter material shown in FIG. 5 is an example in which unevenness and a raised layer are provided on the surface of the filter material shown in FIG. 4.
すなわち、この実施例においては、低密度部が凸部に設
けられ、高密度部が凹部に設けられている。That is, in this embodiment, the low-density portion is provided in the convex portion, and the high-density portion is provided in the concave portion.
したがって、濾過材の製造工程において、ローラーなど
の手段にＪ−って凹凸を設けることによって同時に密度
差が形成される点で有利である。Therefore, in the manufacturing process of the filter medium, it is advantageous in that a difference in density can be created at the same time by providing a means such as a roller with concavities and convexities.
このように、濾過材の表面に凹凸を設けることによって
流れ抵抗も凹部と凸部で変化するので、これにＪ：って
ダストの捕捉を段階的に進行さけることができるという
効果がある。さらに、凹凸部の流速割合いを適宜変化さ
せることににって濾過性能を向上させる上でも有利であ
る。また、一般に大きな粒子は低密度部に集まり、微小
粒子は高密度部で捕捉されやすいので、第５図の様な構
造にすることは、ダストケーキ層のレベルを一定に保持
し、これにより凹凸部の流速割合いを一定に維持して濾
過性能を向上させる上で有利である。In this way, by providing irregularities on the surface of the filter material, the flow resistance changes between the concave and convex portions, which has the effect of preventing dust from being captured in stages. Furthermore, it is advantageous to improve filtration performance by appropriately changing the flow velocity ratio of the uneven portions. In addition, in general, large particles gather in low-density areas, and small particles tend to be captured in high-density areas, so creating a structure like that shown in Figure 5 maintains the level of the dust cake layer at a constant level, thereby creating uneven surfaces. This is advantageous in improving filtration performance by maintaining a constant flow rate ratio.
起毛層を設けることによる効果やチャンバー効果につい
ては前記と同様である。The effect of providing the raised layer and the chamber effect are the same as described above.
濾過材の構成材料どしては、従来、濾紙原料として使用
されている天然繊維、合成繊維ならびにこれらの混合物
が用いられ、必要に応じて、バインダー、着色剤などの
添加剤を用いることもできる。The constituent materials of the filter medium include natural fibers, synthetic fibers, and mixtures thereof, which are conventionally used as raw materials for filter paper, and additives such as binders and colorants may be used as necessary. .
濾過材に密度分布を設ける方法としては、たとえば、綴
紐密度の異なる濾過材を抄き合わせて一体化する方法、
性状、繊維分布の異なる抄紙原料スラリーを抄造工程で
段階的に供給して抄紙する方法などがとられ得る。Examples of methods for providing density distribution in the filter material include a method in which filter materials with different string densities are combined and integrated;
A method may be adopted in which papermaking raw material slurries having different properties and fiber distributions are supplied in stages during the papermaking process.
ま１〔、高密度層は、抄き合わせによって形成し得る。(1) The high-density layer can be formed by sheeting.
また、濾過材の表面を起毛させる方法どしては、たとえ
ば、抄造網の片面に抄紙原料スラリー流を供給すると同
時にその抄造網の細面から吸引することにより、Ｉｌ雑
の長手方向を抄紙表面に対して垂直方向に配向させて起
毛層を効果的に形成することができる。In addition, as a method for raising the surface of the filter material, for example, by supplying a flow of papermaking raw material slurry to one side of a papermaking net and at the same time suctioning it from the narrow side of the papermaking net, the longitudinal direction of the filtration medium is raised on the papermaking surface. A raised layer can be effectively formed by oriented in a direction perpendicular to the surface.
本発明の濾過材を内燃機関のエアーフィルターやオイル
フィルターに用いる場合は、濾過面積を拡大する上で、
断面が菊花状の円筒形に成形することが好ましく、さら
に端部に円板状金属プレートを接合するか、あるいは樹
脂製プレートを一体成形もしくは接着するなどしてフィ
ルター構造とする。When using the filter material of the present invention for an air filter or oil filter of an internal combustion engine, in order to expand the filtration area,
It is preferable to form the filter into a cylindrical shape with a chrysanthemum-shaped cross section, and further to form a filter structure by joining a disk-shaped metal plate to the end, or integrally molding or gluing a resin plate.
ｆｌＬｊＬＬ皿茗月１
本発明の濾過材Ａ（第３図に示すもの）と従来の濾過材
Ｂについて、ＪＩＳ−Ｄ１６１１に記載された濾過性能
試験を行なった場合の結果を第６図に示す。FIG. 6 shows the results of a filtration performance test described in JIS-D1611 performed on the filter material A of the present invention (shown in FIG. 3) and the conventional filter material B.
この際の、濾過材の有効濾過面積は１０００ｃ＃Ｉであ
り、流量は１０９／分、油温は８０℃である。At this time, the effective filtration area of the filter material was 1000c#I, the flow rate was 109/min, and the oil temperature was 80°C.
第６図から明らかなように、本発明の濾過材は、被濾過
流体中のダスト捕捉に伴う圧力損失の増加を、濾過効率
に変動なくゆるやかに進行させることができ、濾過材の
ライフを一層向上さけることができる。As is clear from FIG. 6, the filter medium of the present invention can gradually increase the pressure loss caused by dust capture in the fluid to be filtered without any change in filtration efficiency, further extending the life of the filter medium. You can avoid improvement.
本発明の濾過材は、その厚さ方向において、流体の上流
側が高密度で下流側が低密度であるような密痕勾配を有
し、しかも下流側の濾過材表面に高密度層が形成されて
いるので、ダストケーキ層が形成されやすく、かつ、良
好なチャンバー効果が発揮され、これらの相乗的な作用
により濾過性能の向上とロングライフ化の双方において
すぐれた効果を有している。The filter medium of the present invention has a density gradient in its thickness direction such that the upstream side of the fluid is high density and the downstream side is low density, and a high density layer is formed on the surface of the filter medium on the downstream side. As a result, a dust cake layer is easily formed and a good chamber effect is exhibited, and these synergistic effects have excellent effects in both improving filtration performance and extending life.
第１図〜第５図は、各々、本発明の実施例に係る濾過材
の断面の概念図であり、第６図は、濾過性能の試験結果
を示すグラフである。
１・・・基材、２・・・気孔、３・・・高密度層、４・
・・ダスト、５・・・起毛。1 to 5 are conceptual diagrams of cross sections of filter media according to examples of the present invention, and FIG. 6 is a graph showing test results of filtration performance. DESCRIPTION OF SYMBOLS 1... Base material, 2... Pore, 3... High-density layer, 4...
...Dust, 5...Flushing.
Claims (1)
過流体の流れの上流側が高密度で下流側が低密度であり
、かつ、該下流側の濾過材表面に、少なくとも下流側の
表面密度よりも高い密度を有する高密度層が形成されて
なることを特徴とする、濾過材。 ２、濾過材の面方向に対して高密度部と低密度部とが散
在して形成されている、特許請求の範囲第１項に記載の
濾過材。 ３、被濾過流体の流れの上流側の濾過材表面に凹凸が形
成されている、特許請求の範囲第１項または第２項に記
載の濾過材。 ４、被濾過流体の流れの上流側の濾過材表面に起毛層を
有する、特許請求の範囲第１項ないし第３項のいずれか
１項に記載の濾過材。[Claims] 1. In a filter medium having a density gradient in the thickness direction, the upstream side of the flow of the fluid to be filtered has a high density and the downstream side has a low density, and the surface of the filter medium on the downstream side has at least A filtration material characterized by forming a high-density layer having a higher density than the surface density on the downstream side. 2. The filter medium according to claim 1, wherein high-density portions and low-density portions are formed scattered in the plane direction of the filter medium. 3. The filter material according to claim 1 or 2, wherein the surface of the filter material is formed with irregularities on the upstream side of the flow of the fluid to be filtered. 4. The filter material according to any one of claims 1 to 3, which has a raised layer on the surface of the filter material on the upstream side of the flow of the fluid to be filtered.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11075585A JPS61268320A (en) | 1985-05-23 | 1985-05-23 | Filter material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11075585A JPS61268320A (en) | 1985-05-23 | 1985-05-23 | Filter material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61268320A true JPS61268320A (en) | 1986-11-27 |
| JPH0247923B2 JPH0247923B2 (en) | 1990-10-23 |
Family
ID=14543739
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11075585A Granted JPS61268320A (en) | 1985-05-23 | 1985-05-23 | Filter material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61268320A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50460A (en) * | 1973-05-07 | 1975-01-07 | ||
| JPS5013972A (en) * | 1973-06-08 | 1975-02-13 | ||
| JPS54124370A (en) * | 1978-03-22 | 1979-09-27 | Toray Ind Inc | High-strength unwoven filter cloth and its manufacturing method |
| JPS5523614U (en) * | 1978-07-28 | 1980-02-15 | ||
| JPS5599315A (en) * | 1979-01-24 | 1980-07-29 | Toray Ind Inc | Filter made of nonwoven fabric |
| JPS57119721U (en) * | 1981-01-19 | 1982-07-24 |
-
1985
- 1985-05-23 JP JP11075585A patent/JPS61268320A/en active Granted
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50460A (en) * | 1973-05-07 | 1975-01-07 | ||
| JPS5013972A (en) * | 1973-06-08 | 1975-02-13 | ||
| JPS54124370A (en) * | 1978-03-22 | 1979-09-27 | Toray Ind Inc | High-strength unwoven filter cloth and its manufacturing method |
| JPS5523614U (en) * | 1978-07-28 | 1980-02-15 | ||
| JPS5599315A (en) * | 1979-01-24 | 1980-07-29 | Toray Ind Inc | Filter made of nonwoven fabric |
| JPS57119721U (en) * | 1981-01-19 | 1982-07-24 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0247923B2 (en) | 1990-10-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4976858A (en) | Multi-layer filter medium | |
| JP4199112B2 (en) | Honeycombs with various passage sizes and dies for their manufacture | |
| US20100257830A1 (en) | Partially plug-less dpf | |
| US6206944B1 (en) | Low aspect ratio diesel exhaust filter | |
| JPWO2007074808A1 (en) | Honeycomb structure and manufacturing method thereof | |
| JPWO2007066671A1 (en) | Honeycomb structure and manufacturing method thereof | |
| JPS61268317A (en) | Filter material | |
| SK150896A3 (en) | Fibre-coated filter element and process for manufacturing the same | |
| RU96124363A (en) | FILTER WITH FIBROUS COATING AND METHOD FOR PRODUCING IT | |
| EP0275827B1 (en) | Filter for cleaning the exhaust gases from diesel engines | |
| JPS61268320A (en) | Filter material | |
| JPS61268325A (en) | Filter material | |
| JPS61268323A (en) | Filter material | |
| JPS61268324A (en) | Filter material | |
| JPS61268319A (en) | Filter material | |
| JPS61268322A (en) | Filter material | |
| JPH0154084B2 (en) | ||
| JPH0334966B2 (en) | ||
| JPS61268326A (en) | Filter material for purifying air | |
| JPS61268315A (en) | Filter material | |
| JPS61268316A (en) | Filter material | |
| JP2864247B2 (en) | Filter media for air filter | |
| RU2006653C1 (en) | Filtering member for air cleaner of internal combustion engine | |
| JPH0746334Y2 (en) | Mist filter element | |
| JP3622939B2 (en) | Oil filter filter paper |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| EXPY | Cancellation because of completion of term |