JPH0549825A - Filtering material - Google Patents
Filtering materialInfo
- Publication number
- JPH0549825A JPH0549825A JP23235091A JP23235091A JPH0549825A JP H0549825 A JPH0549825 A JP H0549825A JP 23235091 A JP23235091 A JP 23235091A JP 23235091 A JP23235091 A JP 23235091A JP H0549825 A JPH0549825 A JP H0549825A
- Authority
- JP
- Japan
- Prior art keywords
- fiber
- filter medium
- fibers
- layer
- pore diameter
- 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
Landscapes
- Filtering Materials (AREA)
- Nonwoven Fabrics (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は濾材に関するものであっ
て、特に内燃機関のオイルフィルターやエアフィルター
などに好適な濾材に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter medium, and more particularly to a filter medium suitable for an oil filter or an air filter of an internal combustion engine.
【０００２】[0002]
【従来の技術】従来、フィルター用濾材は、木材パル
プ、木綿、麻、レーヨン等を原料とし、湿式抄紙法によ
り製造した濾紙、あるいはこの濾紙に樹脂を含浸し、強
度、加工性を高めた濾紙タイプのものがある。また、エ
アフィルターとして用いる場合は、この濾紙にオイルを
含浸し、ライフ性能を高めたものがある。2. Description of the Related Art Filter materials for filters have hitherto been produced by a wet papermaking method using wood pulp, cotton, hemp, rayon or the like as a raw material, or a filter paper obtained by impregnating this filter paper with a resin to improve strength and processability. There are types. When used as an air filter, some filter papers are impregnated with oil to improve their life performance.
【０００３】しかしながら、濾紙タイプのものは、その
表面でダストのほとんどを捕集しているため、濾材自体
の圧力損失は大きく、ライフも短いため、濾過面積を大
きくする必要があり、濾材が多量に必要になる。オイル
を含浸したものは、ライフは長いが、圧力損失は大きい
ため、やはり濾過面積を大きくとる必要がある。また、
濾過性能も低くなっている。However, since most of the dust is collected on the surface of the filter paper type, the pressure loss of the filter material itself is large and the life is short, so that it is necessary to increase the filtration area, and a large amount of the filter material is used. Will be needed. The product impregnated with oil has a long life, but since the pressure loss is large, it is also necessary to take a large filtration area. Also,
The filtration performance is also low.
【０００４】また、繊維径が比較的大きいので比較的大
きな粒子は慣性による濾過で捕集されるものの、細かい
粒子は濾材で捕集されにくい。Further, since the fiber diameter is relatively large, relatively large particles are collected by filtration by inertia, but fine particles are difficult to be collected by the filter medium.
【０００５】これに対し、近年合成繊維を原料とし、密
度勾配型に、繊維層を積層し、バインダーを用いて固め
たもの、さらに樹脂を含浸したものが、新たに用いられ
出した。On the other hand, in recent years, a synthetic fiber as a raw material, a density gradient type in which a fiber layer is laminated and hardened with a binder, and a resin impregnated, have been newly used.
【０００６】密度勾配型の濾材は、濾材密度が上流から
下流方向にかけて、粗から密に変化するよう形成されて
いる。これらの濾材は、層を形成する繊維径について、
上流には太い繊維を多くし、下流には細い繊維を多くす
ることで密度コントロールが行われているもの（例え
ば、特公昭５４−４０７７８号公報、特開昭５７−５９
６１４号公報、特開平２−４５４８４号公報）、粉末の
バインダーの分布を制御し、密度をコントロールしたも
の（例えば、特開昭５７−７５１１７号公報）、密度と
坪量のみを規定したもの（例えば、特開昭６２−２７９
８１７号公報）等が開示されている。また、特開昭５２
−１１２８５９号公報に於いては実施例中で、各層の平
均孔径について記載されているが、上流の平均孔径は非
常に大きいものとなっている。従来から、濾材の上流側
と下流側の層のそれぞれの最大、平均孔径を特定の範囲
に制御することで、濾材性能が向上するといった知見は
見いだされていない。The density gradient type filter medium is formed so that the density of the filter medium changes from coarse to dense from upstream to downstream. These filter media, regarding the fiber diameter forming the layer,
Density control is performed by increasing the number of thick fibers in the upstream and the number of thin fibers in the downstream (for example, Japanese Patent Publication No. 54-40778 and Japanese Patent Laid-Open No. 57-59).
No. 614, Japanese Patent Application Laid-Open No. 2-45484), one in which the distribution of the powder binder is controlled to control the density (for example, Japanese Patent Application Laid-Open No. 57-75117), and one in which only the density and basis weight are specified ( For example, JP-A-62-279
No. 817) and the like are disclosed. In addition, JP-A-52
Although the average pore diameter of each layer is described in the examples in Japanese Patent Application Laid-Open No. -112859, the average pore diameter on the upstream side is extremely large. Heretofore, no knowledge has been found that the filter medium performance is improved by controlling the maximum and average pore diameters of the upstream and downstream layers of the filter medium within specific ranges.
【０００７】上記の濾材はいずれも、上流側である低密
度層で大きな粒子を捕足し、高密度層で微細粒子を捕足
することにより、ライフの向上を図ることを目的にして
いる。All of the above filter media are intended to improve life by trapping large particles in the low density layer on the upstream side and trapping fine particles in the high density layer.
【０００８】しかしながら、これら濾材は表面濾過が殆
どできず、濾材内部での目詰まりが起こりやすいため、
圧力損失が増大するという欠点がある。また、濾材表面
での捕集が殆ど行われないので、ライフ向上には限界が
ある。However, since these filter materials are hardly capable of surface filtration and are likely to be clogged inside the filter media,
It has the disadvantage of increased pressure loss. In addition, since there is almost no collection on the surface of the filter medium, there is a limit to the improvement of life.
【０００９】また、密度勾配がついているので、拡散に
よる濾過で比較的小さい粒子を捕集する反面、圧力損失
を下げるため、濾材は大きな孔径を有しており、比較的
大きな粒子の捕集効率は必ずしも満足のいくものではな
い。Further, since the density gradient is provided, relatively small particles are collected by filtration by diffusion, but the filter medium has a large pore size in order to reduce the pressure loss, and the efficiency of collecting relatively large particles. Is not always satisfactory.
【００１０】更に、合成繊維を用いた濾材は、ダストの
捕集性能を高めるため、高密度層の構成繊維を細くし、
比較的厚い層としたり、樹脂含浸量を多くすること、ラ
イフを高めるため、低密度層は厚くすることが行われて
いるが、このため、濾材全体の厚みは必要以上に大きく
なり、圧力損失が大きくなったり、加工上支障をきたす
という問題点があった。Further, in the filter medium using synthetic fibers, in order to enhance the dust collecting performance, the constituent fibers of the high density layer are thinned,
The low-density layer is made thicker to make it a relatively thick layer, increase the amount of resin impregnation, and increase the life, but this causes the thickness of the entire filter medium to become unnecessarily large, resulting in pressure loss. However, there is a problem that the size becomes large and the processing is hindered.
【００１１】また、通常、これら濾材を内燃機関のオイ
ルフィルターやエアフィルターに用いる場合は、濾過面
積を大きくとるために、ひだ折り加工されたエレメント
として使用されているが、濾材自体に十分な硬さが無い
場合もしくは厚みが必要以上に大きい場合などに、エレ
メントに対してかなりの流量あるいは風量がかかるとひ
だ折り部同士が接触し濾過面積の低下をもたらす恐れが
ある。そこで、濾材に硬さを持たせるために添加樹脂量
を多くする方法が一般に取られるが、これにより濾材の
圧力損失が上昇しライフは低下するという問題点があっ
た。When these filter media are used for oil filters and air filters of internal combustion engines, they are usually used as pleated elements in order to increase the filtration area, but the filter media themselves have sufficient hardness. If there is no gap or the thickness is unnecessarily large, and if a considerable flow rate or air volume is applied to the element, the folds may come into contact with each other, resulting in a reduction in the filtration area. Therefore, a method of increasing the amount of resin added to give the filter medium hardness is generally adopted, but this causes a problem that the pressure loss of the filter medium increases and the life thereof decreases.
【００１２】[0012]
【発明が解決しようとする課題】本発明は、上記の課題
を解決するためのものであり、濾過効率が高く、圧力損
失が小さく、しかもライフが長く、適度な硬さを持った
濾材を提供することを目的とする。DISCLOSURE OF THE INVENTION The present invention is intended to solve the above problems, and provides a filter medium having a high filtration efficiency, a small pressure loss, a long life, and an appropriate hardness. The purpose is to do.
【００１３】[0013]
【課題を解決するための手段】本発明者らは、前記の課
題を解決するため鋭意研究を行った。その結果、少なく
とも２層以上の構造を有し、上流側の層と下流側の層の
孔径を所定の範囲に設定することにより、低坪量、低紙
厚、高濾過効率、低圧力損失、ロングライフの濾材を得
られる効果を見いだした。また、上流側の層に捲縮かつ
異型断面形状を有する繊維を用いることにより、濾材が
高濾過効率を維持したまま低圧力損失で長いライフにな
る効果を見いだした。さらに、上流側の層に特定の繊維
径を有する接着性繊維を配合することにより、濾材の厚
みをコントロールすると共に、高捕集効率、低圧力損失
を維持したまま濾材自体に硬さをもたせることができ、
同時に長いライフになる効果を見いだした。本発明は、
これらの知見においてなされたものである。[Means for Solving the Problems] The inventors of the present invention have conducted extensive studies to solve the above problems. As a result, it has a structure of at least two layers, and by setting the pore diameters of the upstream layer and the downstream layer within a predetermined range, low basis weight, low paper thickness, high filtration efficiency, low pressure loss, We have found the effect of obtaining long-life filter media. Further, they have found that the use of crimped fibers having an atypical cross-sectional shape in the upstream layer allows the filter medium to have a long life with low pressure loss while maintaining high filtration efficiency. Furthermore, by blending an adhesive fiber having a specific fiber diameter in the upstream layer, the thickness of the filter medium can be controlled and the filter medium itself can have hardness while maintaining high collection efficiency and low pressure loss. Can
At the same time, I found the effect of a long life. The present invention is
These findings have been made.
【００１４】即ち、本発明によって提供される濾材は、
少なくとも２層以上の構造を有し、ダストを含有する流
体が濾材に流入する側（上流）の層の最大孔径が３０〜
１５０μｍ、平均孔径が２０〜６０μｍであり、流体が
濾材から流出する側（下流）の層の最大孔径が１０〜３
５μｍ、平均孔径が５〜２０μｍであり、上流側の層を
構成する繊維が捲縮かつ異型断面形状を有する繊維及び
接着性繊維からなることを特徴とするものである。That is, the filter medium provided by the present invention is
It has a structure of at least two layers, and the maximum pore diameter of the layer on the side (upstream) where the fluid containing dust flows into the filter medium is 30 to
150 μm, the average pore diameter is 20 to 60 μm, and the maximum pore diameter of the layer on the side (downstream) where the fluid flows out from the filter medium is 10 to 3
It is characterized in that it has a diameter of 5 μm and an average pore diameter of 5 to 20 μm, and the fibers constituting the upstream layer are crimped and have atypical cross-sectional shape and adhesive fibers.
【００１５】また、本発明の濾材は、上流側の層が下流
側の層の２倍以上の繊維目付けを有する２層以上の積層
シートである。Further, the filter medium of the present invention is a laminated sheet of two or more layers in which the upstream layer has a fiber basis weight which is at least twice that of the downstream layer.
【００１６】さらに、湿式抄紙法により形成された層を
少なくとも１層有する濾材である。Further, it is a filter medium having at least one layer formed by a wet papermaking method.
【００１７】以下、本発明の詳細な説明を行う。The present invention will be described in detail below.
【００１８】本発明の濾材は、少なくとも２層以上の繊
維層よりなり、それぞれ特定の孔径を有するものであ
る。孔径の測定に関してはＡＳＴＭ Ｆ−３１６（Amer
icanSociety for Testing Methods)、ＢＳ６４１０
および３３２１（British Standards）に記載された、
液体で空隙（孔）を満たされた濾材にかける圧力を増大
させ、その過程で孔から液体が排出される様子をモニタ
ーすることにより求める方法を用いた。これらは、膜お
よびフィルターの最大孔径および平均孔径を測定するた
めに用いられる一般的な方法である。The filter medium of the present invention comprises at least two or more fiber layers, each having a specific pore size. Regarding the measurement of the pore size, ASTM F-316 (Amer
icanSociety for Testing Methods), BS6410
And 3321 (British Standards),
The method used was to increase the pressure exerted on the filter medium filled with voids (pores) with the liquid and monitor the way the liquid was discharged from the pores in the process. These are common methods used to measure the maximum and average pore size of membranes and filters.
【００１９】上流側に配置された層は、最大孔径が３０
〜１５０μｍ、平均孔径が２０〜６０μｍで、好ましく
は、最大孔径が４０〜１００μｍ、平均孔径が２０〜５
０μｍの孔を有することが望ましい。一方、下流側に配
置された層は最大孔径が１０〜３５μｍ、平均孔径が５
〜２０μｍで、好ましくは、最大孔径が１５〜３０μ
ｍ、平均孔径が８〜２０μｍの孔を有することが望まし
い。The layer arranged on the upstream side has a maximum pore size of 30.
˜150 μm, average pore size 20 to 60 μm, preferably maximum pore size 40 to 100 μm, average pore size 20 to 5
It is desirable to have 0 μm pores. On the other hand, the layer arranged on the downstream side has a maximum pore size of 10 to 35 μm and an average pore size of 5
˜20 μm, preferably with a maximum pore size of 15-30 μm
m, and the average pore size is preferably 8 to 20 μm.
【００２０】上流側の最大孔径が１５０μｍを超えると
き、或は平均孔径が６０μｍを超えるときは、濾材表面
での濾過が行われにくいため、ダストは濾材内部深層で
捕捉され、濾材の圧力損失が急激に大きくなり、濾材の
ライフが短くなる。When the maximum pore size on the upstream side exceeds 150 μm, or when the average pore size exceeds 60 μm, it is difficult to perform filtration on the surface of the filter medium, so that dust is trapped in the inner depth of the filter medium and the pressure loss of the filter medium occurs. It becomes large suddenly and the life of the filter medium becomes short.
【００２１】上流側の最大孔径が３０μｍより小さいと
き、或は平均孔径が２０μｍより小さいときは、濾材の
圧力損失が大きくなり、好ましくない。When the maximum pore size on the upstream side is smaller than 30 μm or when the average pore size is smaller than 20 μm, the pressure loss of the filter medium becomes large, which is not preferable.
【００２２】下流側の最大孔径が３５μｍを超えると
き、或は平均孔径が２０μｍを超えるときは、濾材の圧
力損失は小さくなるものの、捕集効率が小さくなり好ま
しくない。When the maximum pore size on the downstream side exceeds 35 μm, or when the average pore size exceeds 20 μm, the pressure loss of the filter medium decreases, but the collection efficiency decreases, which is not preferable.
【００２３】下流側の最大孔径が１０μｍより小さいと
き、或は平均孔径が５μｍより小さいときは、濾材の圧
力損失は大きくなり好ましくない。When the maximum pore size on the downstream side is smaller than 10 μm or when the average pore size is smaller than 5 μm, the pressure loss of the filter medium becomes large, which is not preferable.
【００２４】次に、濾材の構成について説明する。本発
明の濾材を構成する層はシート状構造を有し、材質は特
に制限はないが、繊維状の材料を用いたものが好まし
い。Next, the structure of the filter medium will be described. The layer constituting the filter medium of the present invention has a sheet-like structure, and the material is not particularly limited, but it is preferable to use a fibrous material.
【００２５】上流側に配置される層は、有機繊維、無機
繊維を適宣混合して用いることができる。例えば、ポリ
エステル繊維、ポリオレフィン繊維、ポリアミド繊維、
ポリイミド繊維、レーヨン繊維、ポリアクリルニトリル
繊維、ポリビニールアルコール繊維等の有機繊維、セラ
ミック繊維、炭素繊維、活性炭素繊維、ガラス繊維、ロ
ックウール繊維、セピオライト繊維等の無機繊維が使用
可能である。これらを単独で用いても良いし、２種類以
上を併用してもよい。For the layer arranged on the upstream side, organic fibers and inorganic fibers can be appropriately mixed and used. For example, polyester fiber, polyolefin fiber, polyamide fiber,
Organic fibers such as polyimide fibers, rayon fibers, polyacrylonitrile fibers and polyvinyl alcohol fibers, ceramic fibers, carbon fibers, activated carbon fibers, glass fibers, rock wool fibers, inorganic fibers such as sepiolite fibers can be used. These may be used alone or in combination of two or more.
【００２６】また、ライフが長く、通気性、通液性の優
れたシートを作成するには高収縮繊維、潜在捲縮繊維、
異型断面形状を有する繊維、伸縮繊維、捲縮かつ異型断
面形状を有する繊維、クリンプ繊維等が適宣選択して使
用される。特に捲縮かつ異型断面形状を有する繊維を使
用した場合、濾材の空間面積が広くなり、通気性、ライ
フの向上が大きくなるのでこの繊維の使用が好ましい。Further, in order to produce a sheet having a long life and excellent breathability and liquid permeability, high shrink fiber, latent crimp fiber,
Fibers having atypical cross-sectional shape, elastic fibers, fibers having crimped and atypical cross-sectional shapes, crimp fibers, etc. are appropriately selected and used. In particular, when a fiber having a crimped shape and an atypical cross-sectional shape is used, the space area of the filter medium is widened, and the air permeability and life are greatly improved, so that the use of this fiber is preferable.
【００２７】一方、上記の捲縮形状を有する繊維を用い
た場合、濾材の厚みが大きくなりすぎて、エレメント加
工時のひだ折り数が増やせない、あるいは硬さがでない
といった欠点が生じる。そこで、接着性繊維を用いる
と、濾材の厚みがある程度抑制され、且つ濾材に硬さを
付与できる。接着性繊維に適した繊維は自己接着性を有
する麻、コットン、木材パルプ等の天然繊維、及び／も
しくは熱溶融性樹脂からなる鞘の融点が芯を形成する樹
脂より４０℃以上低い芯鞘構造を有する、ポリエステル
系、ポリオレフィン系の有機繊維である。これら接着性
繊維の配合量は繊維全体の重量に対して、５〜６０重量
％の範囲が好ましい。５重量％未満の配合量では、十分
なシート強度を得ることができない。また、６０重量％
を越える範囲で用いると、相対的に、異型断面かつ捲縮
形状を有する繊維の配合量が少なくなり、濾材の空間面
積が小さくなるのでライフが短くなる。On the other hand, when the above-mentioned crimped fibers are used, the thickness of the filter medium becomes too large, and the number of folds during element processing cannot be increased or the hardness is not sufficient. Therefore, when the adhesive fiber is used, the thickness of the filter medium can be suppressed to some extent and the filter medium can be provided with hardness. Fibers suitable as adhesive fibers are core-sheath structures having self-adhesive natural fibers such as hemp, cotton, and wood pulp, and / or a melting point of a sheath made of a heat-fusible resin is 40 ° C. or lower than that of the resin forming the core. And a polyester-based or polyolefin-based organic fiber. The compounding amount of these adhesive fibers is preferably in the range of 5 to 60% by weight based on the weight of the whole fibers. If the amount is less than 5% by weight, sufficient sheet strength cannot be obtained. Also, 60% by weight
When it is used in a range of more than 0.1, the amount of the fibers having the irregular cross section and the crimped shape becomes relatively small, and the space area of the filter medium becomes small, so that the life becomes short.
【００２８】本発明の濾材物性を得ることが出来る繊維
の繊維径に関しては、上流側に用いる繊維の繊維径は、
０．５〜１０デニール、好ましくは１〜６デニールであ
る。この径を有する繊維は繊維重量の５０重量％以上含
有されているのが好ましい。０．５デニール未満の細い
繊維を５０重量％を超える範囲で用いると、孔径が小さ
くなり圧力損失が大きくなるため好ましくない。また、
１０デニールを超えると孔径が大きくなり、ダストが濾
材の内部まで進入し、圧力損失の上昇を招き、濾材のラ
イフが短くなる。Regarding the fiber diameter of the fiber which can obtain the physical properties of the filter medium of the present invention, the fiber diameter of the fiber used on the upstream side is
It is 0.5 to 10 denier, preferably 1 to 6 denier. The fibers having this diameter are preferably contained in an amount of 50% by weight or more based on the weight of the fibers. If fine fibers having a denier of less than 0.5 are used in an amount of more than 50% by weight, the pore diameter becomes small and the pressure loss becomes large, which is not preferable. Also,
When it exceeds 10 denier, the pore size becomes large, the dust penetrates into the inside of the filter medium, the pressure loss increases, and the life of the filter medium becomes short.
【００２９】この上流側の層より下流側に配置される層
には、上流側の層に使用した繊維と同様の有機繊維、無
機繊維を適宣混合して用いることができるが、繊維径
０．５デニール以下の捲縮形状を有さない繊維が配合さ
れていることが望ましく、さらにこれらの繊維が下層側
重量に対し、５０％重量以上含有されるのが好ましい。
０．５デニールより太い繊維が多いと、濾材の孔径が大
きくなり、捕集性能が得られない。For the layer arranged on the downstream side of the upstream layer, the same organic fibers and inorganic fibers as those used for the upstream layer can be appropriately mixed and used, but the fiber diameter is 0. It is desirable to mix fibers having a crimped shape of not more than 0.5 denier, and it is preferable that these fibers are contained in an amount of 50% by weight or more based on the weight of the lower layer side.
If there are many fibers thicker than 0.5 denier, the pore size of the filter medium becomes large, and the collection performance cannot be obtained.
【００３０】また、下流側の層の繊維目付けは１０〜３
５ｇ／ｍ2の範囲が好ましく、１０ｇ／ｍ2以下では良好
な捕集性能が行えず、また３５ｇ／ｍ2以上では通気性
が悪化してしまう。The fiber weight of the downstream layer is 10 to 3
A range of 5 g / m 2 is preferable, and if it is 10 g / m 2 or less, good collection performance cannot be obtained, and if it is 35 g / m 2 or more, air permeability is deteriorated.
【００３１】これらのシ−ト形成法としては、乾式法、
スパンボンド法、メルトブロー法等と湿式抄紙法による
方法が考えられる。しかし、乾式法では、均一なシート
を作ること困難で、孔径分布が不均一になり好ましくな
い。スパンボンド法、メルトブロー法では複数の繊維、
例えば直径、繊維長の異なる繊維、材質、形状の異なる
繊維を混合することが困難で、本発明の濾材物性を得る
ことは困難である。These sheet forming methods include a dry method,
Methods such as a spunbond method, a melt blow method, and a wet papermaking method can be considered. However, the dry method is not preferable because it is difficult to form a uniform sheet and the pore size distribution becomes non-uniform. Spunbond method, meltblown method, multiple fibers,
For example, it is difficult to mix fibers having different diameters and fiber lengths, fibers having different materials and shapes, and it is difficult to obtain the physical properties of the filter medium of the present invention.
【００３２】このことから、少なくとも、孔径分布の範
囲が狭く限定されている下流側のシートは、湿式抄紙法
を用いるのが好ましい。一方、上流側のシートは、孔径
分布の範囲限定が比較的広いため、湿式抄紙法の他に乾
式法を用いることも可能である。これらのシートの積層
法としては、特に制限はない。湿式抄紙法による抄き合
わせる方法、湿式抄紙したシートを熱融着する方法、ニ
ードルあるいは高圧水流で一体化する方法等が挙げられ
る。その際、上流側の層が下流側の層の２倍以上の繊維
目付けを有する２層以上の積層シートとすることが好ま
しい。For this reason, it is preferable to use the wet papermaking method for at least the downstream sheet having a narrow pore size distribution range. On the other hand, since the upstream sheet has a relatively wide range of pore size distribution, it is possible to use a dry method in addition to the wet papermaking method. The method for laminating these sheets is not particularly limited. Examples of the method include a method of making paper by a wet papermaking method, a method of heat-sealing a wet papermaking sheet, and a method of integrating them with a needle or a high-pressure water stream. In that case, it is preferable that the upstream layer is a laminated sheet of two or more layers having a fiber weight per unit area that is at least twice that of the downstream layer.
【００３３】このようにして、作製されたシート状構造
物は、上で述したように、さらに、強度アップ、加工性
を向上させる目的で、樹脂を含浸させるが、用いる樹脂
は、熱、電子線、紫外線で硬化するものであればよい。
例えば、フェノール系、アクリル系、酢酸ビニル系、ス
チレン系、エポキシ系等の一般的樹脂が広く使用可能で
ある。特に、ＭＦＴ（最低造膜温度）が１０℃以上のア
クリル系、酢酸ビニル系エマルジョンで繊維交点に集ま
りにくい樹脂の使用が好ましい。含浸方法に特に制限は
ない。As described above, the sheet-like structure thus produced is impregnated with a resin for the purpose of further increasing the strength and the processability. Any material that can be cured with rays or ultraviolet rays may be used.
For example, general resins such as phenol-based, acrylic-based, vinyl acetate-based, styrene-based, and epoxy-based resins can be widely used. In particular, it is preferable to use an acrylic or vinyl acetate emulsion having an MFT (minimum film forming temperature) of 10 ° C. or higher, which is difficult to collect at the fiber intersection. The impregnation method is not particularly limited.
【００３４】樹脂の含浸量はシート重量に対し、３〜２
５重量％で、好ましくは５〜２０重量％である。３重量
％より少ないと濾材が柔らかく、加工性及び強度の向上
効果が少ない。２５重量％を超えると濾材の通気性が悪
化し好ましくない。なお、樹脂を含浸することで、上記
の最大、平均孔径が本発明の範囲をはずれることがあっ
てはならない。The resin impregnation amount is 3 to 2 with respect to the sheet weight.
It is 5% by weight, preferably 5 to 20% by weight. If it is less than 3% by weight, the filter medium is soft and the effect of improving the workability and strength is small. If it exceeds 25% by weight, the air permeability of the filter medium deteriorates, which is not preferable. It should be noted that impregnation with the resin should not deviate the above-mentioned maximum and average pore diameters from the range of the present invention.
【００３５】また、該濾材は必要に応じて、撥水、撥油
加工を施すことも可能である。Further, the filter medium may be subjected to water-repellent or oil-repellent treatment, if necessary.
【００３６】[0036]
【作用】本発明の濾材は、上流の層と、下流の層に特定
の孔径を有する繊維層を用いること、かつ上流の層に捲
縮かつ異型断面形状を有する繊維及び接着性繊維の使用
により達成される高性能の濾材である。特に、内燃機関
のフィルターとして有効に作用する。The filter material of the present invention is obtained by using an upstream layer and a fiber layer having a specific pore size in the downstream layer, and by using a fiber having a crimped and atypical cross-sectional shape and an adhesive fiber in the upstream layer. It is a high-performance filter medium that is achieved. In particular, it works effectively as a filter for an internal combustion engine.
【００３７】[0037]
【実施例】以下に実施例をあげて本発明を具体的に説明
するが、本発明は本実施例に限定されるものではない。The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples.
【００３８】なお、実施例において記載の部、％はすべ
て重量部、重量％によるものである。測定項目は、坪
量、厚み、圧力損失、捕集効率、ライフ、孔径、剛軟度
であり、結果を表１、２に示す。All parts and% in the examples are based on parts by weight and% by weight. The measurement items are basis weight, thickness, pressure loss, collection efficiency, life, pore size, and bending resistance, and the results are shown in Tables 1 and 2.
【００３９】孔径はＡＳＴＭ Ｆ−３１６記載の方法を
用いた。For the pore size, the method described in ASTM F-316 was used.
【００４０】圧力損失はＪＩＳ−Ｂ９９０８の形式１に
より風速５．３ｃｍ／秒で測定した。この数値が小さい
ほど、通気性が良い濾材であることを示す。The pressure loss was measured according to JIS-B9908 type 1 at a wind speed of 5.3 cm / sec. The smaller this value is, the better the air permeability is.
【００４１】捕集効率、ライフは流量１．０４ｍ3／
分、濾過面積２８３ｃｍ2、試験用ダスト１１種（関東
ローム層砂塵、超微粒、日本粉体工業技術協会製）を用
い、試験機により測定した。捕集効率は重量法により求
めた値であり、この数値が大きいほど、捕集性能に優れ
た濾材であることを示す。ライフ測定値は圧力損失が初
期圧力損失より１００ｍｍＡｑ増加したときのダスト保
持量（ｇ）であり、この数値が大きいことは長いライフ
の濾材であることを示す。Collection efficiency and life are 1.04 m 3 /
Minutes, a filtration area of 283 cm 2 , and 11 kinds of test dust (Kanto loam layer sand dust, ultrafine particles, manufactured by Japan Powder Industrial Technology Association) were measured by a tester. The collection efficiency is a value obtained by a gravimetric method, and the larger this value is, the more excellent the filtration performance is. The measured life value is the dust holding amount (g) when the pressure loss is increased by 100 mmAq from the initial pressure loss, and a large value indicates that the filter medium has a long life.
【００４２】剛軟度は、シートを幅２５ｍｍ、長さ８８
ｍｍに裁断し、東洋精機社製ガーレ柔軟度試験機（ＪＩ
Ｓ−Ｌ１０９６）を用いて測定し、算出した。測定値
（ｍｇ）の大きいことはより剛直な濾材であることを示
す。この値が縦３０００ｍｇ、横２０００ｍｇ以上、好
ましくは縦４０００ｍｇ、横２５００ｍｇ以上あること
が加工性の点から望ましい。The bending resistance is such that the sheet has a width of 25 mm and a length of 88.
cut into mm and made by Toyo Seiki Co., Ltd. Gurley flexibility tester (JI
S-L1096) was used for measurement and calculation. A large measured value (mg) indicates a more rigid filter medium. From the viewpoint of workability, it is desirable that these values are 3000 mg in the vertical direction and 2000 mg or more in the horizontal direction, preferably 4000 mg in the vertical direction and 2500 mg in the horizontal direction.
【００４３】実施例１ 上流側として、捲縮かつ異型断面形状を有するＰＥＴ繊
維（Ａ）（２デニール×５ｍｍ、Ｔ型捲縮繊維、クラレ
社製）６０％、ＰＥＴバインダー繊維（ａ）（２デニー
ル×５ｍｍ，メルティー４０８０芯鞘タイプ、ユニチカ
社製）２０％、麻パルプ（Ａ）（エクアドル産マニラ
麻、東邦ワラパルプ社製）２０％を水中に均一に分散
し、スラリーを調製した。Example 1 On the upstream side, 60% PET fibers (A) (2 denier x 5 mm, T-shaped crimp fiber, manufactured by Kuraray Co., Ltd.) having crimps and atypical cross-sections, PET binder fibers (a) (2) Denier x 5 mm, Melty 4080 core-sheath type, manufactured by Unitika Ltd., 20%, and hemp pulp (A) (Manila hemp from Ecuador, manufactured by Toho Strawberry Co., Ltd.) 20% were uniformly dispersed in water to prepare a slurry.
【００４４】下流側として、ＰＥＴ繊維（Ｂ）（０．１
デニール×５ｍｍ、帝人社製）８０％、ＰＥＴバインダ
ー繊維（ａ）２０％を分散剤と共に水中に均一に分散
し、スラリーを調製した。As the downstream side, PET fiber (B) (0.1
80% of denier x 5 mm (manufactured by Teijin Limited) and 20% of PET binder fiber (a) were uniformly dispersed in water together with a dispersant to prepare a slurry.
【００４５】上流側を７０ｇ／ｍ2 、下流側を３０ｇ／
ｍ2のシートからなる２層を抄き合わせ、１２０℃で乾
燥後、１５０℃で１分間熱処理を行った。その後、樹脂
含浸を行い、乾燥後、１５０℃で１０分間キュアリング
を行った。さらに、撥水剤を含浸し乾燥を行い濾材を作
製した。70 g / m 2 on the upstream side and 30 g / m 2 on the downstream side
Two layers of m 2 sheets were combined, dried at 120 ° C., and then heat-treated at 150 ° C. for 1 minute. Then, the resin was impregnated, dried and then cured at 150 ° C. for 10 minutes. Further, a water repellent was impregnated and dried to produce a filter medium.
【００４６】樹脂には、酢酸ビニル系エマルジョン樹脂
（ＭＦＴ ＋１１℃、モビニール７７０、ヘキスト合成
社製）を用い、シート重量に対し１５％の含浸を行っ
た。撥水剤は、フッ素系（スミレーズＦＰ−２１０、住
友化学社製）を用い、シート重量に対し０．１％の含浸
を行った。As the resin, a vinyl acetate emulsion resin (MFT + 11 ° C., Movinyl 770, manufactured by Hoechst Synthetic Co., Ltd.) was used, and impregnation was performed at 15% of the sheet weight. As the water repellent, a fluorine type (Sumiraz FP-210, manufactured by Sumitomo Chemical Co., Ltd.) was used, and impregnation was performed at 0.1% of the sheet weight.
【００４７】実施例２ 上流側の配合をＰＥＴ繊維（Ａ）５０％、ＰＥＴ繊維
（Ｃ）（０．５デニール×５ｍｍ、帝人社製）３０％、
ＰＥＴバインダー繊維（ａ）２０％とし、下流側の配合
をＰＥＴ繊維（Ｂ）７０％、繊維径１μｍ以下の有機合
成繊維（あ）１０％、ＰＥＴバインダー繊維（ａ）２０
％とした以外は実施例２と同様の方法で濾材を作製し
た。Example 2 50% of PET fiber (A) and 30% of PET fiber (C) (0.5 denier x 5 mm, manufactured by Teijin Ltd.) were mixed in the upstream side.
20% of PET binder fiber (a), 70% of PET fiber (B) on the downstream side, 10% of organic synthetic fiber (A) having a fiber diameter of 1 μm or less, PET binder fiber (a) 20
A filter medium was produced in the same manner as in Example 2 except that the percentage was changed to%.
【００４８】実施例３ 上流側の配合をＰＥＴ繊維（Ａ）５０％、ＰＥＴ繊維
（Ｃ）３０％、ＰＥＴバインダー繊維（ａ）２０％と
し、下流側の配合をＰＥＴ繊維（Ｂ）６０％、ＰＥＴ繊
維（Ｃ）２０％、ＰＥＴバインダー繊維（ａ）２０％と
した以外は実施例１と同様の方法で濾材を作製した。Example 3 The composition on the upstream side was 50% PET fiber (A), 30% on PET fiber (C) and 20% PET binder fiber (a), and the composition on the downstream side was 60% PET fiber (B). A filter medium was produced in the same manner as in Example 1 except that PET fiber (C) was 20% and PET binder fiber (a) was 20%.
【００４９】実施例４ 上流側の配合をＰＥＴ繊維（Ａ）５０％、ＰＥＴ繊維
（Ｄ）（６デニール×１０ｍｍ、クリンプ繊維、帝人社
製）３０％、ＰＥＴバインダー繊維（ａ）２０％とし、
下流側の配合をＰＥＴ繊維（Ｂ）６０％、ＰＥＴ繊維
（Ｃ）２０％、ＰＥＴバインダー繊維（ａ）２０％とし
た以外は実施例１と同様の方法で濾材を作成した。Example 4 The composition on the upstream side was 50% PET fiber (A), 30% PET fiber (D) (6 denier x 10 mm, crimp fiber, manufactured by Teijin Ltd.), and 20% PET binder fiber (a).
A filter medium was prepared in the same manner as in Example 1 except that the downstream mixture was 60% PET fiber (B), 20% PET fiber (C), and 20% PET binder fiber (a).
【００５０】実施例５ 上流側の配合をＰＥＴ繊維（Ａ）５０％、ＰＥＴ繊維
（Ｄ）３０％、ＰＥＴバインダー繊維（ａ）２０％と
し、下流側の配合をＰＥＴ繊維（Ｂ）７０％、有機号性
繊維（あ）１０％、ＰＥＴバインダー繊維（ａ）２０％
とした以外は実施例１と同様の方法で濾材を作成した。Example 5 The composition on the upstream side was 50% PET fiber (A), 30% on PET fiber (D) and 20% PET binder fiber (a), and the composition on the downstream side was 70% PET fiber (B). Organic type fiber (A) 10%, PET binder fiber (a) 20%
A filter medium was prepared in the same manner as in Example 1 except that the above was used.
【００５１】実施例６ 上流側の配合をＰＥＴ繊維（Ｅ）（２デニール×５ｍ
ｍ、クリンプ繊維、帝人社製）６０％、麻パルプ（Ａ）
２０％、ＰＥＴバインダー繊維（ａ）２０％とした以外
は実施例１と同様の方法で濾材を作製した。Example 6 The composition on the upstream side was PET fiber (E) (2 denier x 5 m).
m, crimp fiber, Teijin Ltd.) 60%, hemp pulp (A)
A filter medium was produced in the same manner as in Example 1 except that the content was 20% and the PET binder fiber (a) was 20%.
【００５２】実施例７ 上流側の配合をＰＥＴ繊維（Ａ）８０％、ＰＥＴバイン
ダー繊維（ａ）２０％とした以外は実施例１と同様の方
法で濾材を作製した。Example 7 A filter medium was produced in the same manner as in Example 1 except that the upstream mixture was 80% PET fiber (A) and 20% PET binder fiber (a).
【００５３】実施例８ 上流側の配合をレーヨン繊維（１．７デニール×５ｍ
ｍ、Ｙ型捲縮繊維、大和紡社製）６０％、麻パルプ
（Ａ）２０％、ＰＥＴバインダー繊維（ａ）２０％とし
た以外は実施例１と同様の方法で濾材を作成した。Example 8 The composition on the upstream side was changed to rayon fiber (1.7 denier × 5 m).
m, Y-type crimped fiber, manufactured by Daiwabo Co., Ltd.) 60%, hemp pulp (A) 20%, PET binder fiber (a) 20%, and a filter medium was prepared in the same manner as in Example 1.
【００５４】比較例１ 上流側の配合をＰＥＴ繊維（Ｄ）８０％、ＰＥＴバイン
ダー繊維（Ｂ）２０％とした以外は実施例１と同様の方
法で濾材を作製した。Comparative Example 1 A filter medium was prepared in the same manner as in Example 1 except that the upstream fiber mixture was 80% PET fiber (D) and 20% PET binder fiber (B).
【００５５】比較例２ 上流側の配合をＰＥＴ繊維（Ｅ）４０％、ＰＥＴ繊維
（Ｂ）４０％、ＰＥＴバインダー繊維（Ｂ）２０％とし
た以外は実施例１と同様の方法で濾材を作製した。Comparative Example 2 A filter medium was prepared in the same manner as in Example 1 except that the upstream mixture was 40% PET fiber (E), 40% PET fiber (B) and 20% PET binder fiber (B). did.
【００５６】比較例３ 上流側の配合をＰＥＴ繊維（Ｅ）８０％、ＰＥＴバイン
ダー繊維（ａ）２０％とし、下流側の配合をＰＥＴ繊維
（Ｂ）４０％、ＰＥＴ繊維（Ｃ）４０％、ＰＥＴバイン
ダー繊維（ａ）２０％とした以外は実施例１と同様の方
法で濾材を作製した。Comparative Example 3 The composition on the upstream side was 80% PET fiber (E) and 20% on PET binder fiber (a), and the composition on the downstream side was 40% PET fiber (B) and 40% PET fiber (C). A filter medium was produced in the same manner as in Example 1 except that the PET binder fiber (a) was 20%.
【００５７】比較例４ 上流側の配合をＰＥＴ繊維（Ｅ）８０％、ＰＥＴバイン
ダー繊維（ａ）２０％とし、下流側の配合をＰＥＴ繊維
（Ｂ）６０％、有機合成繊維（あ）２０％、ＰＥＴバイ
ンダー繊維（ａ）２０％とした以外は実施例１と同様の
方法で濾材を作製した。Comparative Example 4 The composition on the upstream side was 80% PET fiber (E) and 20% on PET binder fiber (a), and the composition on the downstream side was 60% PET fiber (B) and 20% organic synthetic fiber (A). A filter medium was produced in the same manner as in Example 1 except that the PET binder fiber (a) was 20%.
【００５８】比較例５、６ 市販のエレメントを購入し、使用濾材の評価を行った。
比較例５は、樹脂を含浸した乾式不織布と樹脂を含浸し
ない乾式不織布をニードルパンチ方式で一体化したもの
で、比較例６は、針葉樹パルプ、木綿パルプを抄紙し、
フェノール樹脂を含浸した濾紙タイプの濾材である。Comparative Examples 5 and 6 Commercially available elements were purchased and the filter media used were evaluated.
In Comparative Example 5, a dry non-woven fabric impregnated with a resin and a dry non-woven fabric not impregnated with a resin are integrated by a needle punch method, and in Comparative Example 6, softwood pulp and cotton pulp are made into paper,
It is a filter paper type filter material impregnated with a phenol resin.
【００５９】濾材の物性を表１に、濾過性能を表２に示
す。The physical properties of the filter medium are shown in Table 1, and the filtration performance is shown in Table 2.
【００６０】[0060]
【表１】 [Table 1]
【００６１】[0061]
【表２】 [Table 2]
【００６２】表１、２より上流とその下流に特定の孔径
を有し、かつ該上流側に異型断面を有する捲縮繊維、及
び接着性繊維を含有する層を有する濾材が捕集効率が高
く、ロングライフで硬さが優れることが判る。即ち、上
流側層の最大孔径が１５０μｍを越えるとライフが短く
なり（比較例１参照）、一方、３０μｍ未満であると圧
力損失が高くなる（比較例２参照）。また、下流側層の
最大孔径が３５μｍを越えると捕集効率が低下し（比較
例３参照）、５μｍ未満であると圧力損失が高くなる
（比較例４参照）。他社乾式品（比較例５）は孔径が非
常に大きいため、捕集効率が大きく劣っており、また厚
みがかなりあるため、ひだ折り加工時におけるひだ折り
数に制限があり、有効濾過面積が減少するといった欠点
がある。濾紙タイプ品（比較例６）では、圧力損失が高
くライフ性能も悪いことが判る。また、上流側に異型断
面かつ捲縮繊維を含有する層を有する濾材では、捲縮繊
維を含有する層を有する濾材と比べてライフが向上して
いることが判る（実施例１と実施例６）。接着性繊維を
多く含有する場合、硬さが優れている濾材の作製が可能
なことが判る（実施例１と実施例７）。また、上流側層
に配合する異型断面かつ捲縮繊維を、ＰＥＴ繊維（Ａ）
（Ｔ型捲縮繊維）からレーヨン繊維（Ｙ型捲縮繊維）に
変えても、同様の効果があることが判る（実施例６と実
施例８）。A filter medium having a layer containing crimped fibers having a specific pore size upstream and downstream of Tables 1 and 2 and having a modified cross section on the upstream side and an adhesive fiber has a high collection efficiency. It can be seen that the hardness is excellent in long life. That is, when the maximum pore diameter of the upstream layer exceeds 150 μm, the life becomes short (see Comparative Example 1), while when it is less than 30 μm, the pressure loss increases (see Comparative Example 2). Further, if the maximum pore size of the downstream layer exceeds 35 μm, the collection efficiency decreases (see Comparative Example 3), and if it is less than 5 μm, the pressure loss increases (see Comparative Example 4). The dry product of another company (Comparative Example 5) has a very large pore size, so the collection efficiency is greatly inferior, and the thickness is considerable, so the number of folds during pleating is limited and the effective filtration area is reduced. There is a drawback that It can be seen that the filter paper type product (Comparative Example 6) has high pressure loss and poor life performance. Further, it is found that the life of the filter medium having the irregular cross section and the layer containing the crimped fibers on the upstream side is improved as compared with the filter medium having the layer containing the crimped fibers (Examples 1 and 6). ). It is understood that when the adhesive fiber is contained in a large amount, it is possible to produce a filter medium having excellent hardness (Examples 1 and 7). Further, the PET fiber (A) is used as the PET fiber (A) having a modified cross-section and crimped fibers to be mixed in the upstream layer.
It can be seen that the same effect can be obtained by changing the (T-type crimped fiber) to the rayon fiber (Y-type crimped fiber) (Examples 6 and 8).
【００６３】[0063]
【発明の効果】本発明の濾材は圧力損失が低く、捕集効
率が高く、ライフが長く、強度、硬さを有するため加工
性に優れた濾材である。フィルター、特に内燃機関のエ
アフィルターとして効果的である。The filter material of the present invention has a low pressure loss, a high collection efficiency, a long life, strength and hardness, and is excellent in workability. It is effective as a filter, especially as an air filter for an internal combustion engine.
Claims (3)
シートであって、ダストを含有する流体が濾材に流入す
る側（上流）の層の最大孔径が３０〜１５０μｍ、平均
孔径が２０〜６０μｍであり、流体が濾材から流出する
側（下流）の層の最大孔径が１０〜３５μｍ、平均孔径
が５〜２０μｍであり、上流側の層を構成する繊維が、
捲縮かつ異型断面形状を有する繊維及び接着性繊維から
なる濾材。1. A laminated sheet having a structure of at least two layers, wherein the layer on the side (upstream) where the fluid containing dust flows into the filter medium has a maximum pore diameter of 30 to 150 μm and an average pore diameter of 20 to 60 μm. The maximum pore diameter of the layer on the side (downstream) where the fluid flows out from the filter medium is 10 to 35 μm, the average pore diameter is 5 to 20 μm, and the fibers constituting the upstream layer are
A filter medium comprising crimped and atypical cross-section fibers and adhesive fibers.
維目付けを有する２層以上の積層シートである請求項１
記載の濾材。2. The laminated sheet of two or more layers, wherein the upstream layer has a fiber basis weight which is at least twice that of the downstream layer.
The described filter material.
とも１層有する請求項１又は２記載の濾材。3. The filter medium according to claim 1, which has at least one layer formed by a wet papermaking method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23235091A JP3138016B2 (en) | 1991-08-19 | 1991-08-19 | Filter media |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23235091A JP3138016B2 (en) | 1991-08-19 | 1991-08-19 | Filter media |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0549825A true JPH0549825A (en) | 1993-03-02 |
| JP3138016B2 JP3138016B2 (en) | 2001-02-26 |
Family
ID=16937836
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23235091A Expired - Fee Related JP3138016B2 (en) | 1991-08-19 | 1991-08-19 | Filter media |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3138016B2 (en) |
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001523562A (en) * | 1997-11-25 | 2001-11-27 | フイルテルウエルク マン ウント フンメル ゲゼルシヤフト ミツト ベシユレンクテル ハフツング | Filter element |
| JP2002001020A (en) * | 2000-04-10 | 2002-01-08 | Toray Ind Inc | Filtering medium |
| JP2003517371A (en) * | 1999-11-23 | 2003-05-27 | ポール・コーポレーション | Porous media for dissipating charge |
| JPWO2003043717A1 (en) * | 2001-11-21 | 2005-03-10 | 三菱重工業株式会社 | Dust collector filter, dust collector, and gas turbine intake device |
| WO2008032388A1 (en) * | 2006-09-14 | 2008-03-20 | Dynic Corporation | Air filter material |
| JP2008168194A (en) * | 2007-01-10 | 2008-07-24 | Nifco Inc | Filter device for fuel |
| JP2011048177A (en) * | 2009-08-27 | 2011-03-10 | Kyoritsu Kagaku Sangyo Kk | Filtering method of sealing agent for liquid crystal display element and method for manufacturing the same |
| US7987996B2 (en) | 2007-06-20 | 2011-08-02 | Toyota Boshoku Kabushiki Kaisha | Filter medium, fluid filter, and engine oil filter |
| JP2011240311A (en) * | 2010-05-21 | 2011-12-01 | Hokuetsu Kishu Paper Co Ltd | Filtering medium for air filter |
| US8206584B2 (en) | 1999-11-23 | 2012-06-26 | Pall Corporation | Electrically conductive fluid treatment elements |
| JP2013220375A (en) * | 2012-04-16 | 2013-10-28 | Toyobo Co Ltd | Filter medium |
| EP2308579B1 (en) | 2004-11-05 | 2016-01-27 | Donaldson Company, Inc. | Aerosol separator |
| JP2017207052A (en) * | 2016-05-18 | 2017-11-24 | 現代自動車株式会社Ｈｙｕｎｄａｉ Ｍｏｔｏｒ Ｃｏｍｐａｎｙ | Intake filter and air cleaner applied with high density filter paper, and vehicle |
| US10155187B2 (en) | 2010-04-27 | 2018-12-18 | Hollingsworth & Vose Company | Filter media with a multi-layer structure |
| JP2019093360A (en) * | 2017-11-27 | 2019-06-20 | 帝人フロンティア株式会社 | Filter medium for liquid filter |
| JP2020165048A (en) * | 2019-03-29 | 2020-10-08 | 三菱製紙株式会社 | Carbon fiber nonwoven fabric and carbon fiber-reinforced resin composite |
-
1991
- 1991-08-19 JP JP23235091A patent/JP3138016B2/en not_active Expired - Fee Related
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001523562A (en) * | 1997-11-25 | 2001-11-27 | フイルテルウエルク マン ウント フンメル ゲゼルシヤフト ミツト ベシユレンクテル ハフツング | Filter element |
| US8206584B2 (en) | 1999-11-23 | 2012-06-26 | Pall Corporation | Electrically conductive fluid treatment elements |
| JP2003517371A (en) * | 1999-11-23 | 2003-05-27 | ポール・コーポレーション | Porous media for dissipating charge |
| US8206583B2 (en) | 1999-11-23 | 2012-06-26 | Pall Corporation | Electrically conductive fluid treatment elements |
| JP2002001020A (en) * | 2000-04-10 | 2002-01-08 | Toray Ind Inc | Filtering medium |
| JPWO2003043717A1 (en) * | 2001-11-21 | 2005-03-10 | 三菱重工業株式会社 | Dust collector filter, dust collector, and gas turbine intake device |
| EP2308579B1 (en) | 2004-11-05 | 2016-01-27 | Donaldson Company, Inc. | Aerosol separator |
| WO2008032388A1 (en) * | 2006-09-14 | 2008-03-20 | Dynic Corporation | Air filter material |
| US7968176B2 (en) | 2006-09-14 | 2011-06-28 | Dynic Corporation | Air filter material |
| JP2008168194A (en) * | 2007-01-10 | 2008-07-24 | Nifco Inc | Filter device for fuel |
| US7987996B2 (en) | 2007-06-20 | 2011-08-02 | Toyota Boshoku Kabushiki Kaisha | Filter medium, fluid filter, and engine oil filter |
| JP2011048177A (en) * | 2009-08-27 | 2011-03-10 | Kyoritsu Kagaku Sangyo Kk | Filtering method of sealing agent for liquid crystal display element and method for manufacturing the same |
| US10155187B2 (en) | 2010-04-27 | 2018-12-18 | Hollingsworth & Vose Company | Filter media with a multi-layer structure |
| JP2011240311A (en) * | 2010-05-21 | 2011-12-01 | Hokuetsu Kishu Paper Co Ltd | Filtering medium for air filter |
| JP2013220375A (en) * | 2012-04-16 | 2013-10-28 | Toyobo Co Ltd | Filter medium |
| JP2017207052A (en) * | 2016-05-18 | 2017-11-24 | 現代自動車株式会社Ｈｙｕｎｄａｉ Ｍｏｔｏｒ Ｃｏｍｐａｎｙ | Intake filter and air cleaner applied with high density filter paper, and vehicle |
| JP2019093360A (en) * | 2017-11-27 | 2019-06-20 | 帝人フロンティア株式会社 | Filter medium for liquid filter |
| JP2020165048A (en) * | 2019-03-29 | 2020-10-08 | 三菱製紙株式会社 | Carbon fiber nonwoven fabric and carbon fiber-reinforced resin composite |
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| Publication number | Publication date |
|---|---|
| JP3138016B2 (en) | 2001-02-26 |
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