JPH06126112A - Filter medium for filtration of liquid - Google Patents
Filter medium for filtration of liquidInfo
- Publication number
- JPH06126112A JPH06126112A JP27647792A JP27647792A JPH06126112A JP H06126112 A JPH06126112 A JP H06126112A JP 27647792 A JP27647792 A JP 27647792A JP 27647792 A JP27647792 A JP 27647792A JP H06126112 A JPH06126112 A JP H06126112A
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- Prior art keywords
- filter medium
- fiber
- filtration
- diameter
- fibers
- Prior art date
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、液体中に含有される粒
子を効率良く除去し、清浄な液体を得るための液体濾過
用フィルター濾材に関するものである。更に詳しくは、
金属の型彫、切断加工等に使用されている放電加工機の
加工液中に含まれる加工クズやＩＣ生産における基板の
ウエハの切断、研磨、エッチング等の工程で使用される
超純水中に含まれる加工クズを効率良く除去し清浄な液
体を得るための濾材、及び自動車用エンジンオイル、燃
料等各種液体濾過用のフィルター濾材に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter medium for liquid filtration for efficiently removing particles contained in a liquid to obtain a clean liquid. For more details,
In the processing waste contained in the processing liquid of the electric discharge machine used for metal stamping and cutting, and in the ultrapure water used in the steps such as cutting, polishing and etching of the substrate wafer in IC production. The present invention relates to a filter medium for efficiently removing processing dust contained therein to obtain a clean liquid, and a filter medium for filtering various liquids such as automobile engine oil and fuel.
【０００２】[0002]
【従来の技術】従来、放電加工機やＩＣ生産工程で使用
されている液体濾過用フィルターや自動車用エンジンオ
イル、燃料等各種液体濾過用のフィルターには、天然パ
ルプと有機繊維の混抄シートにフェノール樹脂等を含浸
処理したシート、ポリエステル不織布（スパンボンド）
等が使用されているが、濾過効率が低く、ライフが短い
等の問題がある。2. Description of the Related Art Conventionally, in a filter for liquid filtration, an engine oil for automobiles, fuel for various liquids such as fuels used in electric discharge machines and IC production processes, a mixed paper sheet of natural pulp and organic fiber and phenol are used. Sheets impregnated with resin, polyester non-woven fabric (spunbond)
However, there are problems such as low filtration efficiency and short life.
【０００３】即ち、従来の濾材は濾材内部で粒子を捕捉
する機能であり、ライフを延ばすために比較的粗い濾材
を使用しており、濾材内部に粒子が入り濾材の空隙をあ
る程度埋める迄は目標の濾過効率は得られない。濾材の
空隙が埋まると圧損が上昇し液の透過性が悪くなりライ
フが短くなるか、濾材内部の粒子が濾材内部から流出し
効率が悪くなる等の問題がある。That is, the conventional filter medium has a function of capturing particles inside the filter medium, and a relatively coarse filter medium is used to prolong the life of the filter medium. The filtration efficiency of is not obtained. When the voids of the filter medium are filled, there is a problem that the pressure loss increases and the liquid permeability deteriorates to shorten the life, or the particles inside the filter medium flow out from the inside of the filter medium and the efficiency deteriorates.
【０００４】又、高性能のフィルターとしてフッ素樹脂
等の多孔質シートがあるが高価なため特殊用途に限定さ
れ、放電加工機やＩＣ生産工程のように多量の液体を処
理する濾材としては不適である。Further, although there is a porous sheet such as a fluororesin as a high-performance filter, it is expensive and thus limited to a special purpose, and is not suitable as a filter medium for treating a large amount of liquid such as an electric discharge machine or an IC production process. is there.
【０００５】これらの問題を解決する方法として、フィ
ブリル化された有機繊維を用いた濾材が開発されている
（特開昭５９−９２０１１号公報）。しかしながら、こ
のような繊維を単独で用いて通常の湿式抄紙法により製
造しようとした場合には、ワイヤーから流失が大きく、
ワイヤーの目づまりを生じる等の製造上の問題が避けら
れない。たとえ濾材が得られたとしても、繊維が微細で
あるために得られる濾材は非常に緻密となり、その結果
高い濾過効率は得られるものの濾過抵抗が高く実用に適
さない。濾過抵抗を下げようとして比較的径の太いモノ
フィラメントの繊維を含有した場合には、抄造工程での
微細繊維の流失がより多くなり、濾過効率の低下が著し
く、十分な性能が得られない。As a method for solving these problems, a filter medium using fibrillated organic fibers has been developed (Japanese Patent Laid-Open No. 59-92011). However, when such a fiber is used alone to produce it by an ordinary wet papermaking method, the runoff from the wire is large,
Manufacturing problems such as wire clogging are unavoidable. Even if a filter medium is obtained, the filter medium obtained is very dense due to the fine fibers, and as a result, although high filtration efficiency is obtained, it has high filtration resistance and is not suitable for practical use. When a monofilament fiber having a relatively large diameter is contained in an attempt to reduce the filtration resistance, the fine fibers are more likely to be washed away in the papermaking process, the filtration efficiency is remarkably reduced, and sufficient performance cannot be obtained.
【０００６】特開平３−１２２０８号公報では、繊維径
が１μｍ以下にフィブリル化された有機繊維、繊維径１
〜５μｍの極細有機繊維、及び繊維径５μｍ以上の有機
繊維を配合することによって、フィブリル化された有機
繊維の凝集を抑え、均質なネットワークを形成し、さら
に、カレンダー処理を施して、濾材表面の平滑性を向上
させ、表面濾過機構を有している。この濾材は表面濾過
機構であるために、濾過性能、ライフは非常に良好であ
る。しかし、濾材の厚みは非常に薄く、腰（硬さ）がな
いために、ひだ折加工ができない。さらに湿潤強度が非
常に弱いために、放電加工機用フィルター、自動車エン
ジンオイル用フィルター、自動車燃料用フィルターに使
用した場合、液体の圧力で破れてしまう。In Japanese Patent Laid-Open No. 3-12208, an organic fiber fibrillated to have a fiber diameter of 1 μm or less, a fiber diameter of 1
By blending an ultrafine organic fiber of ˜5 μm and an organic fiber having a fiber diameter of 5 μm or more, aggregation of fibrillated organic fibers is suppressed, a homogeneous network is formed, and calendering is further applied to the surface of the filter medium. Improves smoothness and has a surface filtration mechanism. Since this filter material has a surface filtration mechanism, it has very good filtration performance and life. However, since the thickness of the filter medium is very thin and there is no waist (hardness), it cannot be pleated. Furthermore, since the wet strength is very weak, when it is used as a filter for an electric discharge machine, a filter for an automobile engine oil, or a filter for an automobile fuel, it is broken by the pressure of the liquid.
【０００７】又、特開昭６１−２６８３２１号公報、同
６１−２６８３２５号公報、同６１−２７５４９５号公
報等に密度勾配をつけた２層構成の濾材が例示されてい
るが、これらの濾材は、２層の濾材を組合せることによ
り濾過効率とライフのバランスをとっており、本発明の
濾材表面（濾材層のみ）で濾過性能を得る方法とは基本
的に異なったものである。In addition, Japanese Patent Laid-Open Nos. 61-268321, 61-268325, 61-275495 and the like exemplify a two-layer filter medium having a density gradient. By combining two layers of filter media, the filtration efficiency and the life are balanced, which is basically different from the method of obtaining the filtration performance on the surface of the filter media (only the filter media layer) of the present invention.
【０００８】[0008]
【発明が解決しようとする課題】本発明は上記の欠点や
問題点を解決し、濾過抵抗が小さく、濾過効率が高く、
且つひだ折加工性の良く、湿潤強度の強いフィルター濾
材を提供することを目的としている。The present invention solves the above-mentioned drawbacks and problems, and has a low filtration resistance and a high filtration efficiency.
Moreover, it is an object of the present invention to provide a filter medium having a good fold processability and a high wet strength.
【０００９】[0009]
【発明が解決するために手段】これらの問題点を解決す
る方法として、種々の繊維のフィルターへの応用を検討
した結果、今までに無い良好なフィルター特性が得られ
ることを見出し、本発明を完成させた。As a method for solving these problems, as a result of studying application of various fibers to a filter, it was found that excellent filter characteristics which have never been obtained can be obtained, and the present invention was made. Completed
【００１０】即ち、本発明の液体濾過用フィルター濾材
は、該フィルター濾材が、濾材と支持体とを抄合わせ一
体化してなるものであり、該濾材が、下記〜の有機
繊維からなり、の有機繊維の１部又は全部に繊維状有
機バインダーを用い、且つ１〜１０μｍの平均空隙径を
有し、５〜５０ｇ／ｍ2の坪量からなるものであり、該
支持体が、繊維径７μｍ以上の有機繊維で、ポリオレフ
ィン系、ポリアミド系、ポリエステル系、アクリル系、
ビニロン系の合成繊維の少なくとも１種類からなり、こ
れにポリエステル系、ポリオレフィン系、塩ビ酢酸ビニ
ル系の繊維状有機バインダーの少なくとも１種類を１０
〜７０重量％含有し、且つ３０〜１５０ｇ／ｍ2の坪量
からなるものであることを特徴とするものである。 繊維径が１μｍ以下にフィブリル化された有機繊維５
〜４０重量％ 繊維径が１〜５μｍの極細有機繊維５〜７０重量％ 繊維径が５μｍ以上の有機繊維２０〜７０重量％That is, the filter medium for liquid filtration of the present invention comprises the filter medium and the support, which are combined and integrated, and the filter medium is composed of the following organic fibers. A fibrous organic binder is used for a part or all of the fibers, has an average void diameter of 1 to 10 μm, and has a basis weight of 5 to 50 g / m 2 , and the support has a fiber diameter of 7 μm or more. These organic fibers are polyolefin-based, polyamide-based, polyester-based, acrylic-based,
It is composed of at least one kind of vinylon type synthetic fiber, and at least one kind of polyester type, polyolefin type or vinyl chloride vinyl acetate type fibrous organic binder.
To 70% by weight and having a basis weight of 30 to 150 g / m 2 . Organic fiber 5 fibrillated to a fiber diameter of 1 μm or less
-40% by weight Ultrafine organic fibers having a fiber diameter of 1-5 μm 5-70% by weight Organic fibers having a fiber diameter of 5 μm or more 20-70% by weight
【００１１】本発明の液体濾過用フィルター濾材は、薄
くて表面濾過性能に優れた高性能の濾材と、液体の透過
性が良く高強度でひだ折り加工性の良い支持体とを抄合
わせ一体化することにより得られる液体濾過用フィルタ
ー濾材である。The filter medium for liquid filtration of the present invention is a thin and high-performance filter medium having excellent surface filtration performance, and a support having good liquid permeability, high strength and good fold-folding property, which are integrated with each other. It is a filter medium for liquid filtration obtained by
【００１２】本発明の濾材に用いられる繊維径が１μｍ
以下にフィブリル化された有機繊維としては、例えば、
以下に示す方法で加工されたものが挙げられる。 １）合成高分子溶液を該高分子の貧溶媒中にせん断力を
かけながら流下させ、繊維状フィブリルを沈澱させる方
法（フィブリッド法、特公昭３５−１１８５１号公
報）。 ２）合成モノマーを重合させながらせん断をかけフィブ
リルを析出させる方法（重合せん断法、特公昭４７−２
１８９８号公報）。 ３）二種以上の非相溶性高分子を混合し、溶融押し出
し、又は紡糸し、切断後機械的な手段で繊維状にフィブ
リル化する方法（スプリット法、特公昭３５−９６５１
号公報）。 ４）二種以上の非相溶性高分子を混合し、溶融押し出
し、又は紡糸し、切断後溶剤に侵漬して一方の高分子を
溶解し、繊維状にフィブリル化する方法（ポリマーブレ
ンド溶解法、米国特許３、３８２、３０５号）。 ５）合成高分子をその溶媒の沸点以上で、且高圧側から
低圧側へ爆発的に噴出させた後、繊維状にフィブリル化
する方法（フィラシュ紡糸法、特公昭３６−１６４６０
号公報）。 ６）ポリエステル系高分子に該ポリエステルに非相溶の
アルカリ可溶成分をブレンドし、成形後アルカリにより
減量後叩解し、繊維状にフィブリル化する方法（アルカ
リ減量叩解法、特開昭５６−３１５号公報）。 ７）ケブラー繊維等の高結晶性、高配向性繊維を適当な
繊維長に切断後、水中に分散させ、ホモジナイザー、叩
解機等を用いてフィブリル化する方法（特開昭５６−１
００８０１号公報、特開昭５９−９２０１１号公報）等
の方法によって得られる繊維であり、具体的な例として
は、ケブラー繊維を均質化装置でフィブリル化したティ
アラー４００Ｓ（ダイセル社製）、アルカリ減量叩解法
によって得られたポリエステルパルプ等が挙げられる。The fiber diameter used in the filter medium of the present invention is 1 μm.
Examples of the fibrillated organic fiber include:
The thing processed by the method shown below is mentioned. 1) A method of causing a synthetic polymer solution to flow into a poor solvent for the polymer while applying a shearing force to precipitate fibrous fibrils (fibrid method, Japanese Patent Publication No. 35-11851). 2) Method of precipitating fibrils by shearing while polymerizing the synthetic monomer (polymerization shearing method, Japanese Patent Publication No. 47-2)
1898). 3) A method in which two or more incompatible polymers are mixed, melt-extruded or spun, and then cut into fibrous fibrils by mechanical means (split method, JP-B-35-9651).
Issue). 4) A method in which two or more incompatible polymers are mixed, melt-extruded, or spun, cut and then immersed in a solvent to dissolve one polymer, and fibrillated into a fibrous form (polymer blend dissolution method). , U.S. Pat. No. 3,382,305). 5) A method in which a synthetic polymer is explosively ejected from the high-pressure side to the low-pressure side at a temperature not lower than the boiling point of the solvent and then fibrillated into a fibrous state (Firash spinning method, Japanese Patent Publication No. 36-16460).
Issue). 6) A method in which a polyester polymer is blended with an insoluble alkali-soluble component in the polyester, and after molding, the mixture is reduced with an alkali and beaten to form fibrils (alkaline weight loss beating method, JP-A-56-315). Issue). 7) A method in which highly crystalline and highly oriented fibers such as Kevlar fibers are cut into suitable fiber lengths, dispersed in water, and fibrillated using a homogenizer, a beating machine, etc. (JP-A-56-1)
No. 801, JP-A-59-92011) and the like, and specific examples thereof include Tiara 400S (manufactured by Daicel) in which Kevlar fibers are fibrillated by a homogenizer, and alkali weight loss. Examples include polyester pulp obtained by a beating method.
【００１３】これらフィブリル化された有機繊維の配合
量は５〜４０重量％が適当であり、好ましくは５〜３０
重量％である。５重量％未満では濾材の平均空隙径が大
きくなり十分な捕集効率が得られず、また４０重量％を
越えると濾過抵抗が大きく実用に適さない。The amount of these fibrillated organic fibers is suitably 5-40% by weight, preferably 5-30%.
% By weight. If it is less than 5% by weight, the average pore size of the filter medium becomes large and sufficient collection efficiency cannot be obtained, and if it exceeds 40% by weight, the filtration resistance becomes large and it is not suitable for practical use.
【００１４】本発明の濾材に用いられる繊維径が１〜５
μｍの極細有機繊維とは、例えば、５μｍ以下のポリエ
ステル繊維、ＰＶＡ繊維、アクリル繊維等が挙げられ
る。The fiber diameter used in the filter material of the present invention is from 1 to 5
Examples of the ultrafine organic fibers having a thickness of 5 μm include polyester fibers having a thickness of 5 μm or less, PVA fibers, and acrylic fibers.
【００１５】これらの繊維の配合量は５〜７０重量％が
適当であり、好ましくは１０〜６０重量％である。５重
量％未満では１μｍ以下の微細繊維のワイヤーからの流
失が多く十分な濾過効率が得られず、又、湿紙のワイヤ
ーからの剥がれが悪い等の製造上の問題を生じ、又、７
０重量％を超えると濾過抵抗が大きくなり実用に適さな
い。The amount of these fibers to be blended is appropriately 5 to 70% by weight, preferably 10 to 60% by weight. If it is less than 5% by weight, sufficient filtration efficiency cannot be obtained due to the loss of fine fibers of 1 μm or less from the wire, and the wet paper is not easily peeled off from the wire.
If it exceeds 0% by weight, the filtration resistance increases and it is not suitable for practical use.
【００１６】本発明の濾材に用いられる繊維径５μｍ以
上の有機繊維とは、ポリオレフィン、ポリアミド、ポリ
エステル、ポリアクリルアミド、ビニロン等の合成繊維
のほか、パルプ、リンター、リント、又はその誘導体等
が挙げられる。Examples of the organic fibers having a fiber diameter of 5 μm or more used in the filter medium of the present invention include synthetic fibers such as polyolefin, polyamide, polyester, polyacrylamide, and vinylon, as well as pulp, linter, lint, or derivatives thereof. .
【００１７】又、繊維状有機バインダーとは、皮膜を形
成し難い複合接着性繊維（例えば芯鞘タイプ）、即ち繊
維内部が高融点で、外皮が低融点のポリマーで構成され
る複合接着性繊維で、ポリエステル系、ポリオレフィン
系、塩ビ酢酸ビニル系等が挙げられる。The fibrous organic binder is a composite adhesive fiber that does not easily form a film (for example, a core-sheath type), that is, a composite adhesive fiber composed of a polymer having a high melting point inside the fiber and a low melting point outer skin. Examples thereof include polyester type, polyolefin type and vinyl chloride vinyl acetate type.
【００１８】低融点のみで構成される繊維状バインダー
（全融タイプ）や、ポリビニルアルコール系のような熱
水性バインダーは、濾材の乾燥工程で皮膜を形成し易
く、濾過抵抗が大きくなり好ましくないが、特性を阻害
しない範囲で使用することはできる。A fibrous binder composed only of a low melting point (total melting type) and a hot water-based binder such as polyvinyl alcohol-based binder are not preferable because they easily form a film in the step of drying the filter medium and increase filtration resistance. However, it can be used within a range that does not impair the characteristics.
【００１９】繊維径５μｍ以上の有機繊維の配合量は２
０〜７０重量％であるが、これらのうち繊維状有機バイ
ンダーの配合量は全繊維量の２０〜６０重量％が適当で
あり、好ましくは３０〜５０重量％である。The amount of organic fiber having a fiber diameter of 5 μm or more is 2
The amount of the fibrous organic binder is 20 to 60% by weight, preferably 30 to 50% by weight, based on the total amount of fibers.
【００２０】ここで、２０重量％未満では濾材の表面強
度が弱く、フィルターユニットの加工性の点で問題があ
り、６０重量％を超えると濾過抵抗が大きくなり実用上
問題がある。又、繊維径５μｍ以上の有機繊維が７０重
量％を超えるとシートの平均空隙径が大きくなり、濾過
性能が悪くなる。Here, if it is less than 20% by weight, the surface strength of the filter medium is weak and there is a problem in workability of the filter unit, and if it exceeds 60% by weight, the filtration resistance becomes large and there is a practical problem. On the other hand, if the amount of organic fibers having a fiber diameter of 5 μm or more exceeds 70% by weight, the average void diameter of the sheet becomes large and the filtration performance becomes poor.
【００２１】本発明の濾材の坪量は５〜５０ｇ／ｍ2が
適当であり、好ましくは１０〜３０ｇ／ｍ2である。５
ｇ／ｍ2未満ではピンホール等により信頼性の点で問題
がある。５０ｇ／ｍ2を越えると濾過抵抗が上昇し抄紙
性が悪くなり、又、表面濾過の点から坪量を増やしても
効果は期待できず、コスト面でも問題がある。The basis weight of the filter medium of the present invention is suitably 5 to 50 g / m 2 , and preferably 10 to 30 g / m 2 . 5
If it is less than g / m 2 , there is a problem in reliability due to pinholes and the like. If it exceeds 50 g / m 2 , the filtration resistance increases and the paper-making property deteriorates. Further, from the viewpoint of surface filtration, even if the basis weight is increased, no effect can be expected and there is a problem in cost.
【００２２】本発明の濾材の平均空隙径は表面濾過の点
で１〜１０μｍが適当であり、好ましくは２〜８μｍで
ある。平均ポア径が１μｍ未満では濾過抵抗が大きくな
り、液の透過性が悪くなり実用上問題となる。平均空隙
径が１０μｍを超えると微細粒子が濾材内部に入り、目
詰まりを生じライフが短くなる。The average pore diameter of the filter material of the present invention is suitably 1 to 10 μm, preferably 2 to 8 μm, in view of surface filtration. If the average pore diameter is less than 1 μm, the filtration resistance becomes large and the liquid permeability deteriorates, which is a practical problem. If the average void diameter exceeds 10 μm, fine particles enter the inside of the filter medium, causing clogging and shortening the life.
【００２３】最大空隙径については特に限定しないが、
濾材の均質性の点で最大空隙径は平均空隙径の３倍以下
が好ましい。Although the maximum void diameter is not particularly limited,
From the viewpoint of homogeneity of the filter medium, the maximum void diameter is preferably 3 times or less of the average void diameter.
【００２４】本発明の支持体に用いられる繊維径が７μ
ｍ以上の有機繊維とは、ポリオレフィン、ポリアミド、
ポリエステル、ポリアクリルアミド、ビニロン等の合成
繊維が挙げられ、少なくとも１種類を含有する支持体で
ある。これらの有機繊維の特徴としては、シートに腰を
持たせる点で繊維強度が強く、剛直な繊維が好ましい。
又、濾材を通過した微細粒子の付着によるライフの低下
を抑える点で、皮膜を形成しない棒状（断面の形状が円
形、楕円形、繭形等）の形態をした繊維が好ましい。他
の使用できる繊維としては、皮膜の少ない未叩解の天然
パルプ、麻パルプ、コットンリンター、リント、再生セ
ルロース等が挙げられ、湿潤強度等の性能を阻害しない
範囲で配合できる。The fiber diameter used for the support of the present invention is 7 μm.
m or more organic fiber means polyolefin, polyamide,
It is a support containing at least one kind of synthetic fiber such as polyester, polyacrylamide and vinylon. As a characteristic of these organic fibers, a rigid fiber is preferable because it has a high fiber strength in that the sheet has elasticity.
Further, from the viewpoint of suppressing the decrease in life due to the adhesion of fine particles that have passed through the filter medium, fibers having a rod shape (circular cross section, elliptical shape, cocoon shape, etc.) that does not form a film are preferable. Other usable fibers include unbeaten natural pulp, hemp pulp, cotton linter, lint, regenerated cellulose, and the like, which have a small amount of film, and can be blended within a range that does not impair performance such as wet strength.
【００２５】本発明の支持体に用いられる繊維状有機バ
インダーとは、皮膜を形成しにくい複合接着性繊維（例
えば芯鞘タイプ）、即ち繊維内部が高融点で、外皮が低
融点のポリマーで構成される複合接着性繊維で、ポリエ
ステル系、ポリオレフィン系、塩ビ酢酸ビニル系等の繊
維状有機バインダーを少なくとも１種、１０〜７０重量
％の範囲で含有する液体濾過用フィルター濾材である。The fibrous organic binder used in the support of the present invention is composed of a composite adhesive fiber (for example, a core-sheath type) that does not easily form a film, that is, a polymer having a high melting point inside the fiber and a low melting point outer skin. The filter material for liquid filtration contains at least one fibrous organic binder such as polyester-based, polyolefin-based, vinyl chloride vinyl acetate-based or the like in the range of 10 to 70% by weight.
【００２６】低融点のみで構成される繊維状バインダー
（全融タイプ）や、ポリビニルアルコール系のような熱
水性バインダーは、濾材の乾燥工程で皮膜を形成し易
く、濾過抵抗が大きくなり好ましくないが、特性を阻害
しない範囲で使用することはできる。A fibrous binder composed only of a low melting point (total melting type) and a hot water-based binder such as polyvinyl alcohol-based binder are not preferable because they easily form a film in the step of drying the filter medium and increase filtration resistance. However, it can be used within a range that does not impair the characteristics.
【００２７】支持体の繊維状有機バインダーの配合量は
１０〜７０重量％の範囲が適当であり、１０重量％未満
では抄紙後樹脂バインダーを含浸する工程で必要な耐水
強度が得られない。又、７０重量％を超えると低融点の
バインダーの皮膜が多くなり、フィルター濾材全体の圧
力損失が高くなり、ライフが短くなる。The suitable amount of the fibrous organic binder in the support is in the range of 10 to 70% by weight. If it is less than 10% by weight, the water resistance required in the step of impregnating the resin binder after papermaking cannot be obtained. On the other hand, if it exceeds 70% by weight, the film of the binder having a low melting point increases, the pressure loss of the entire filter medium increases, and the life becomes short.
【００２８】支持体に用いる繊維の繊維径は７μｍ以上
が適当であり、繊維径が７μｍ未満では支持体の濾過抵
抗が大きくなり、液体の透過性が悪くなる。繊維径の上
限は特に限定しないが、抄紙性等を考慮すると繊維径は
５０μｍ以下が好ましい。The fiber diameter of the fiber used for the support is preferably 7 μm or more. When the fiber diameter is less than 7 μm, the filtration resistance of the support becomes large and the liquid permeability deteriorates. The upper limit of the fiber diameter is not particularly limited, but the fiber diameter is preferably 50 μm or less in consideration of papermaking properties and the like.
【００２９】本発明の支持体の坪量は３０〜１５０ｇ／
ｍ2が適当であり、好ましくは４０〜１００ｇ／ｍ2であ
る。３０ｇ／ｍ2未満ではひだ折り加工性が悪く、１５
０ｇ／ｍ2を超えると厚みが増し、ユニットに納まる濾
材面積が小さくなり、又濾過抵抗が大きくなり実用上問
題があると共にコスト面からも好ましくない。The basis weight of the support of the present invention is 30 to 150 g /
m 2 is suitable, and preferably 40 to 100 g / m 2 . If it is less than 30 g / m 2 , the fold-folding processability is poor and 15
If it exceeds 0 g / m 2 , the thickness increases, the area of the filter medium that can be contained in the unit decreases, and the filtration resistance increases, which is a problem in practice and is not preferable in terms of cost.
【００３０】本発明の支持体に使用する繊維は、水、及
び油等による膨潤の少ない合成繊維を主体としているた
めに、湿潤引張強度が強く、液体の圧力によるフィルタ
ー濾材の破れが無い。Since the fibers used for the support of the present invention are mainly synthetic fibers which are less swelled by water, oil, etc., the wet tensile strength is strong and the filter medium is not broken by the pressure of the liquid.
【００３１】本発明のフィルター濾材は、一般紙や湿式
不織布を製造するための抄紙機、例えば長網抄紙機、円
網抄紙機、傾斜ワイヤー式抄紙機等を２機組合せたコン
ビネーションマシンによる抄合わせにより製造される。
組合せは同一タイプの抄紙機の組合せ、異種の抄紙機の
組合せどちらでも可能である。The filter medium of the present invention is produced by a combination machine which is a combination of two paper machines such as a fourdrinier paper machine, a cylinder paper machine and a slanted wire paper machine for producing general paper and wet non-woven fabric. Manufactured by.
The combination can be a combination of the same type of paper machines or a combination of different types of paper machines.
【００３２】本発明のフィルター濾材の強度、腰（硬
さ）を上げる目的で各種バインダーを付与することが可
能である。用いられるバインダーは、アクリル系、酢酸
ビニル系、エポキシ系、合成ゴム系、塩化ビニリデン系
等のラテックス、ＰＶＡ、澱粉、フェノール樹脂等を単
独、又は２種類以上を併用できる。Various binders can be added for the purpose of increasing the strength and stiffness (hardness) of the filter medium of the present invention. As the binder to be used, acrylic, vinyl acetate, epoxy, synthetic rubber, vinylidene chloride latex and the like, PVA, starch and phenol resin can be used alone or in combination of two or more kinds.
【００３３】又、必要に応じ濾材の特性を阻害しない範
囲で撥水剤、分散剤、歩留り向上剤、染料等の添加剤を
配合することができる。If desired, additives such as a water repellent, a dispersant, a retention improver, and a dye may be added within a range that does not impair the characteristics of the filter medium.
【００３４】本発明の液体濾過用フィルター濾材に付与
されるバインダーの量は、該フィルター濾材に対して３
０重量％以下が適当であり、好ましくは２０重量％以下
である。３０重量％を超えるとフィルター濾材の濾過抵
抗が大きくなり、実用上問題がある。The amount of the binder applied to the filter material for liquid filtration of the present invention is 3 with respect to the filter material.
0 wt% or less is suitable, and preferably 20 wt% or less. If it exceeds 30% by weight, the filtration resistance of the filter medium increases, which is a practical problem.
【００３５】該フィルター濾材にバインダーを付与する
方法としては、特に限定はしないが、サイズプレス、タ
ブサイズ、スプレー含浸、内添等が挙げられる。The method of applying the binder to the filter medium is not particularly limited, but examples thereof include size press, tab size, spray impregnation and internal addition.
【００３６】[0036]
【作用】本発明のフィルター濾材が高い濾過効率と高ラ
イフの両方を同時に満足するのは、濾材に繊維径１μｍ
以下の微細繊維と繊維径１〜５μｍの極細有機繊維、及
び繊維径５μｍ以上の有機繊維を組み合わせることで、
繊維径１μｍ以下の繊維の凝集が抑えられ、また繊維径
１μｍ以下の微細繊維と繊維径１〜５μｍの極細繊維が
良く絡み合い、より均一なネットワークを形成し、均質
で微細な空隙径を有し、粒子を濾材表面で濾過するとい
う表面濾過機能を有するためである。即ち、使用初期か
ら高効率の濾過性能が得られ、濾材の内部の空隙を粒子
で埋めないためライフが長くなると推測される。The filter medium of the present invention satisfies both high filtration efficiency and long life at the same time because the filter medium has a fiber diameter of 1 μm.
By combining the following fine fibers with ultrafine organic fibers having a fiber diameter of 1 to 5 μm, and organic fibers having a fiber diameter of 5 μm or more,
Agglomeration of fibers with a fiber diameter of 1 μm or less is suppressed, and fine fibers with a fiber diameter of 1 μm or less and ultrafine fibers with a fiber diameter of 1 to 5 μm are entangled well to form a more uniform network and have a uniform and fine void diameter. This is because it has a surface filtration function of filtering particles on the surface of the filter medium. That is, it is presumed that highly efficient filtration performance can be obtained from the initial stage of use and the voids inside the filter medium are not filled with particles, so that the life is extended.
【００３７】又、この濾材に濾過抵抗の少ない繊維から
成る支持体を抄合わせすることにより、濾材のみでは得
られないひだ折り加工性の良く、湿潤引張強度の強いフ
ィルター濾材が得られた。By combining a support made of fibers having low filtration resistance with this filter medium, a filter medium having a good fold-folding property and a high wet tensile strength, which cannot be obtained by the filter medium alone, was obtained.
【００３８】[0038]
【実施例】以下、本発明を実施例により説明するが、本
発明はこれらに何等限定されるものではない。なお、実
施例及び比較例における空隙径、坪量、濾過抵抗（濾過
速度で評価した）、濾過効率、及び湿潤引張強度は以下
の方法で測定した。EXAMPLES The present invention will be described below with reference to examples, but the present invention is not limited thereto. The void diameter, basis weight, filtration resistance (evaluated by filtration rate), filtration efficiency, and wet tensile strength in Examples and Comparative Examples were measured by the following methods.
【００３９】濾材の空隙径は、ＡＳＴＭ−Ｆ−３１６記
載のバブルポイント法及びミーンフロー法により最大空
隙径、平均空隙径を求めた。The pore diameter of the filter medium was determined by the bubble point method and the mean flow method described in ASTM-F-316 to determine the maximum pore diameter and the average pore diameter.
【００４０】濾過効率、濾過速度の測定にはＪＩＳ第８
種粉体を０．０５％濃度になるように水に希釈したもの
を試験用液体として用い、以下の方法で測定した。JIS No. 8 is used for measuring the filtration efficiency and the filtration rate.
The seed powder was diluted with water to a concentration of 0.05% and used as a test liquid, and the measurement was performed by the following method.
【００４１】初期濾過効率：濾材を水で湿潤した後、試
験用液体１００ｍｌを瀘過面積１４ｃｍ2 、差圧△Ｐ＝
３２０ｍｍＨｇで瀘過し、濾過前後液の３〜１０μｍ粒
子数をリオン（株）製の液中微粒子計数器（ＫＬ−０
１）で測定した。Initial filtration efficiency: After wetting the filter medium with water, 100 ml of the test liquid was filtered, the filtration area was 14 cm 2 , and the differential pressure ΔP =
After filtering with 320 mmHg, the number of particles in the liquid before and after filtration of 3 to 10 μm is measured by a particle counter in liquid (KL-0, manufactured by Rion Co., Ltd.).
It was measured in 1).
【００４２】初期濾過速度：上記濾過性能試験時の濾過
時間から濾過速度を得た。Initial filtration rate: The filtration rate was obtained from the filtration time during the above-mentioned filtration performance test.
【００４３】ライフ試験：上記試験液を用いて１０回繰
り返し濾過した後、上記試験と同様の方法で濾過効率、
濾過速度を測定した。 湿潤引張強度：湿潤引張強度は、ＪＩＳ−８１３５、及
びＪＩＳ−８１１３に則り、フィルター濾材を巾１５ｍ
ｍ、長さ２００ｍｍに裁断し、２０℃の純水に５分間浸
した後、テンシロン測定機（オリエンテック社製、ＨＴ
Ｍ−１００）を用いて、フルスケール１０ｋｇ（タテ測
定時）、及び４ｋｇ（ヨコ測定時）で、破断時の荷重を
おのおの１０回測定し、その平均値を示した。 ひだ折り加工性試験：サンプルをひだ状に加工し、加工
性の非常に良いものを◎、良いものを○、やや悪いもの
を△、悪いものを×の４段階で評価した。Life test: After repeating filtration 10 times using the above test liquid, filtration efficiency was measured in the same manner as in the above test.
The filtration rate was measured. Wet tensile strength: Wet tensile strength is 15 m in width for filter media according to JIS-8135 and JIS-8113.
m, 200 mm in length, and immersed in pure water at 20 ° C for 5 minutes, and then a tensilon measuring machine (HT manufactured by Orientec Co., Ltd., HT
Using M-100), the load at break was measured 10 times for each of the full scale of 10 kg (during vertical measurement) and 4 kg (during horizontal measurement), and the average value is shown. Crimping processability test: Samples were processed into pleats and evaluated with four grades of ⊚ for good workability, ◯ for good workability, Δ for slightly bad workability, and × for bad workability.
【００４４】実施例１〜５ ケブラー微細繊維（ティアラー４００Ｓ、ダイセル化学
社製）と極細ポリエステル繊維（旭化成社製、０．１デ
ニール×３ｍｍ、直径約３μｍ）とポリエステル繊維
（帝人社製、０．５デニール×５ｍｍ、直径約７μｍ）
と熱接着性（芯鞘タイプ）ポリエステル繊維（ユニチカ
社製４０８０、２デニール×５ｍｍ、直径約１５μｍ）
を表１に示す濾材の繊維配合なるように混合して水性ス
ラリーを作製し、これらのスラリーから標準角形手抄き
抄紙機を用いて坪量２０g/m2の濾材を形成した。Examples 1 to 5 Kevlar fine fiber (Tiara 400S, manufactured by Daicel Chemical Co., Ltd.), ultrafine polyester fiber (manufactured by Asahi Kasei Co., Ltd., 0.1 denier × 3 mm, diameter about 3 μm) and polyester fiber (manufactured by Teijin Ltd., 0. 5 denier x 5 mm, diameter about 7 μm)
Heat-adhesive (core-sheath type) polyester fiber (Unitika 4080, 2 denier x 5 mm, diameter about 15 μm)
Was mixed so as to have a fiber content of the filter medium shown in Table 1 to prepare an aqueous slurry, and a filter medium having a basis weight of 20 g / m 2 was formed from these slurries using a standard square handmade paper machine.
【００４５】ポリエステル繊維（帝人社製、０．５デニ
ール×５ｍｍ、直径約７μｍ）、ビニロン繊維（クラレ
社製、１デニール×６ｍｍ、直径約１０μｍ）、ポリエ
ステル繊維（帝人社製、２デニール×５ｍｍ、直径約１
５μｍ）、ＮＢＫＰ未叩解パルプ（三菱製紙社製）、及
び熱接着性（芯鞘タイプ）ポリエステル繊維（ユニチカ
社製４０８０、２デニール×５ｍｍ、直径約１５μｍ）
を表−１に示す支持体の繊維配合なるように混合して水
性スラリーを作製し、これらのスラリーから標準角形手
抄き抄紙機を用いて支持体を形成した。Polyester fiber (manufactured by Teijin Ltd., 0.5 denier × 5 mm, diameter about 7 μm), vinylon fiber (manufactured by Kuraray Co., Ltd., 1 denier × 6 mm, diameter about 10 μm), polyester fiber (manufactured by Teijin Ltd., 2 denier × 5 mm) , Diameter about 1
5 μm), NBKP unbeaten pulp (manufactured by Mitsubishi Paper Mills), and heat-adhesive (core-sheath type) polyester fiber (Unitika 4080, 2 denier x 5 mm, diameter about 15 μm)
Was mixed so as to have the fiber composition of the support shown in Table 1 to prepare an aqueous slurry, and the support was formed from these slurries using a standard square handmade paper machine.
【００４６】湿紙の状態の濾材と支持体とを抄き合わせ
一体化させた後、プレス、乾燥してシートを得た。その
後、このシートに５ｇ／ｍ2 になるようにアニオン性ア
クリルラテックス（日本アクリル社製、プライマールＨ
Ａ−１６）をサイズプレスで含浸し、エアドライヤーで
乾燥させ、実施例１〜５の液体濾過用フィルター濾材を
得た。測定結果を表１に示す。A filter material in the form of a wet paper and a support were made into a sheet and integrated, and then pressed and dried to obtain a sheet. Thereafter, an anionic acrylic latex to be 5 g / m 2 on this sheet (Nippon acrylic Co., primers Le H
A-16) was impregnated with a size press and dried with an air dryer to obtain filter media for liquid filtration of Examples 1-5. The measurement results are shown in Table 1.
【００４７】比較例１〜４ ケブラー微細繊維（ティアラー４００Ｓ、ダイセル化学
社製）と極細ポリエステル繊維（旭化成社製、０．１デ
ニール×３ｍｍ、直径約３μｍ）とポリエステル繊維
（帝人社製、０．５デニール×５ｍｍ、直径約７μｍ）
と熱接着性（芯鞘タイプ）ポリエステル繊維（ユニチカ
社製４０８０、２デニール×５ｍｍ、直径約１５μｍ）
を表２に示す濾材の繊維配合なるように混合して水性ス
ラリーを作製し、これらのスラリーから標準角形手抄き
抄紙機を用いて坪量２０ｇ／ｍ2となる様にシートを形
成した。湿紙の状態の濾材をプレス、乾燥した後、この
シートを温度１２０℃で熱カレンダー処理し、密度０．
５ｇ／ｃｍ3の液体濾過用フィルター濾材を得た。測定
結果を表２に示す。Comparative Examples 1 to 4 Kevlar fine fiber (Tiara 400S, manufactured by Daicel Chemical Co., Ltd.), ultrafine polyester fiber (manufactured by Asahi Kasei Co., 0.1 denier x 3 mm, diameter about 3 μm) and polyester fiber (manufactured by Teijin Ltd., 0. 5 denier x 5 mm, diameter about 7 μm)
Heat-adhesive (core-sheath type) polyester fiber (Unitika 4080, 2 denier x 5 mm, diameter about 15 μm)
Was mixed so that the fibers of the filter medium shown in Table 2 were mixed to prepare an aqueous slurry, and a sheet having a basis weight of 20 g / m 2 was formed from these slurries using a standard square handmade paper machine. The filter material in the form of wet paper is pressed and dried, and then this sheet is subjected to a heat calendering treatment at a temperature of 120 ° C. to obtain a density of 0.
A filter medium for liquid filtration of 5 g / cm 3 was obtained. The measurement results are shown in Table 2.
【００４８】比較例５ 阿波製紙社製液体濾過用フィルター濾材ＯＡ−８００Ｅ
（単層構造品）の性能表２に示す。Comparative Example 5 Filter material OA-800E for liquid filtration manufactured by Awa Paper Co., Ltd.
Performance table 2 of (single-layer structure product) is shown.
【００４９】[0049]
【表１】 [Table 1]
【００５０】[0050]
【表２】 [Table 2]
【００５１】表１の実施例１〜５に示すように、本発明
の液体濾過用フィルター濾材は、使用初期から濾過効率
が良好で、濾材内部の空隙を粒子で埋めないためにライ
フが長くなる。また、支持体は液体中での膨潤が少ない
合成繊維を主体として構成されているために湿潤引張強
度が強く、液体の圧力による破れが無いと共に、ひだ折
加工性が良好である。As shown in Examples 1 to 5 of Table 1, the filter material for liquid filtration of the present invention has good filtration efficiency from the beginning of use and has a long life because the voids inside the filter material are not filled with particles. . Further, since the support is composed mainly of synthetic fibers that are less swelled in liquid, it has high wet tensile strength, is not broken by the pressure of the liquid, and has good pleasing workability.
【００５２】表２の比較例１〜４に示すように、熱カレ
ンダー処理した濾材のみからなる液体濾過用フィルター
濾材は、使用初期から濾過効率が良好で、濾材内部の空
隙を粒子で埋めないためにライフが長くなる。しかし、
密度が０．５ｇ／ｃｍ3であり、厚みが０．０４ｍｍで
あるために腰（硬さ）がなく、ひだ折加工性が非常に悪
いばかりでなく、湿潤引張強度が弱いために、液体の圧
力によって破れてしまう。As shown in Comparative Examples 1 to 4 in Table 2, the filter material for liquid filtration consisting only of the heat calendered filter material has good filtration efficiency from the beginning of use and does not fill the voids inside the filter material with particles. The life becomes long. But,
Since the density is 0.5 g / cm 3 and the thickness is 0.04 mm, there is no stiffness (hardness), the fold-folding processability is very poor, and the wet tensile strength is weak, It will break under pressure.
【００５３】表２の比較例５に示すように、阿波製紙製
フィルター濾材ＯＡ−８００Ｅは、湿潤引張強度が強
く、ひだ折加工性が良好であるが、平均空隙径が大きく
濾材内部で粒子を捕捉する内部濾過方式であるために、
濾材内部を粒子で埋める迄は、濾液はきれいにならな
い。また、濾材内部が粒子で埋まるため、濾材全体の濾
過抵抗が大きくなり、ライフが短くなる。As shown in Comparative Example 5 in Table 2, the filter medium OA-800E made by Awa Paper Co., Ltd. has high wet tensile strength and good fold-folding workability, but has a large average pore diameter and particles inside the medium. Because it is an internal filtration method to capture,
The filtrate is not clean until the inside of the filter medium is filled with particles. Further, since the inside of the filter medium is filled with particles, the filtration resistance of the entire filter medium becomes large and the life becomes short.
【００５４】[0054]
【発明の効果】本発明の液体濾過用フィルター濾材は、
使用初期から濾過効率が良好で、濾材内部の空隙を粒子
で埋めないためにライフが長いため、研磨屑等による機
械の損傷が少なくなり、フィルターの交換回数を減少さ
せることができる。The filter material for liquid filtration of the present invention comprises:
The filtration efficiency is good from the initial stage of use, and the life is long because the voids inside the filter medium are not filled with particles, so that mechanical damage due to polishing dust and the like is reduced, and the number of times of filter replacement can be reduced.
─────────────────────────────────────────────────────
─────────────────────────────────────────────────── ───
【手続補正書】[Procedure amendment]
【提出日】平成４年１０月２１日[Submission date] October 21, 1992
【手続補正１】[Procedure Amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００４７[Correction target item name] 0047
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【００４７】比較例１〜４ ケブラー微細繊維（ティアラー４００Ｓ、ダイセル化学
社製）と極細ポリエステル繊維（旭化成社製、０．１デ
ニール×３ｍｍ、直径約３μｍ）と極細アクリル繊維
（三菱レイヨン社製、０．１デニール×３ｍｍ、直径約
３μｍ）と熱接着性（芯鞘タイプ）ポリエステル繊維
（ユニチカ社製４０８０、２デニール×５ｍｍ、直径約
１５μｍ）を表２に示す濾材の繊維配合なるように混合
して水性スラリーを作製し、これらのスラリーから標準
角形手抄き抄紙機を用いて坪量２０ｇ／ｍ2となる様に
シートを形成した。湿紙の状態の濾材をプレス、乾燥し
た後、このシートを温度１２０℃で熱カレンダー処理
し、密度０．５ｇ／ｃｍ3の液体濾過用フィルター濾材
を得た。測定結果を表２に示す。Comparative Examples 1 to 4 Kevlar fine fiber (Tearer 400S, manufactured by Daicel Chemical Co., Ltd.), ultrafine polyester fiber (Asahi Kasei Co., Ltd., 0.1 denier × 3 mm, diameter about 3 μm) and ultrafine acrylic fiber
(Manufactured by Mitsubishi Rayon Co., 0.1 denier x 3 mm, diameter approx.
3 μm) and heat-adhesive (core-sheath type) polyester fibers (4080 manufactured by Unitika Ltd., 2 denier × 5 mm, diameter about 15 μm) are mixed so as to be a fiber blend of the filter medium shown in Table 2 to prepare an aqueous slurry. A sheet was formed from the above slurry using a standard square handmade paper machine so that the basis weight was 20 g / m 2 . After the filter material in the form of a wet paper was pressed and dried, this sheet was subjected to a heat calendering treatment at a temperature of 120 ° C. to obtain a filter material for liquid filtration having a density of 0.5 g / cm 3 . The measurement results are shown in Table 2.
【手続補正２】[Procedure Amendment 2]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００５０[Correction target item name] 0050
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【００５０】[0050]
【表２】 [Table 2]
Claims (1)
フィルター濾材が、濾材と支持体とを抄合わせ一体化し
てなるものであり、該濾材が、下記〜の有機繊維か
らなり、の有機繊維の１部又は全部に繊維状有機バイ
ンダーを用い、且つ１〜１０μｍの平均空隙径を有し、
５〜５０ｇ／ｍ2の坪量からなるものであり、該支持体
が、繊維径７μｍ以上の有機繊維で、ポリオレフィン
系、ポリアミド系、ポリエステル系、アクリル系、ビニ
ロン系の合成繊維の少なくとも１種類からなり、これに
ポリエステル系、ポリオレフィン系、塩ビ酢酸ビニル系
の繊維状有機バインダーの少なくとも１種類を１０〜７
０重量％含有し、且つ３０〜１５０ｇ／ｍ2の坪量から
なるものであることを特徴とする液体濾過用フィルター
濾材。 繊維径が１μｍ以下にフィブリル化された有機繊維５
〜４０重量％ 繊維径が１〜５μｍの極細有機繊維５〜７０重量％ 繊維径が５μｍ以上の有機繊維２０〜７０重量％1. A filter medium for liquid filtration, wherein the filter medium is made by combining a filter medium and a support, and the filter medium is composed of the following organic fibers. Using a fibrous organic binder in part or all and having an average void diameter of 1 to 10 μm,
The support has a basis weight of 5 to 50 g / m 2 , and the support is an organic fiber having a fiber diameter of 7 μm or more, and is at least one kind of polyolefin-based, polyamide-based, polyester-based, acrylic-based, and vinylon-based synthetic fibers. And 10 to 7 of at least one type of fibrous organic binder of polyester, polyolefin, or vinyl chloride vinyl acetate.
A filter medium for liquid filtration, characterized by containing 0% by weight and having a basis weight of 30 to 150 g / m 2 . Organic fiber 5 fibrillated to a fiber diameter of 1 μm or less
-40% by weight Ultrafine organic fibers having a fiber diameter of 1-5 μm 5-70% by weight Organic fibers having a fiber diameter of 5 μm or more 20-70% by weight
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27647792A JP3305372B2 (en) | 1992-10-15 | 1992-10-15 | Filter media for liquid filtration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27647792A JP3305372B2 (en) | 1992-10-15 | 1992-10-15 | Filter media for liquid filtration |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06126112A true JPH06126112A (en) | 1994-05-10 |
| JP3305372B2 JP3305372B2 (en) | 2002-07-22 |
Family
ID=17570002
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27647792A Expired - Fee Related JP3305372B2 (en) | 1992-10-15 | 1992-10-15 | Filter media for liquid filtration |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3305372B2 (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007021400A (en) * | 2005-07-19 | 2007-02-01 | Toray Ind Inc | Filter |
| JP2007113135A (en) * | 2005-10-19 | 2007-05-10 | Daifuku Paper Mfg Co Ltd | Filter paper for liquid filtration and method for producing the filter paper for liquid filtration |
| JP2007167788A (en) * | 2005-12-22 | 2007-07-05 | Toyota Boshoku Corp | Filter medium for filter, filter for fluid filtration, and oil filter for engine |
| JP2011045825A (en) * | 2009-08-26 | 2011-03-10 | Denso Corp | Filter medium for fuel filter |
| EP2864019A4 (en) * | 2012-06-20 | 2016-06-29 | Hollingsworth & Vose Co | Fibrillated fibers for liquid filtration media |
| US10322380B2 (en) | 2012-06-20 | 2019-06-18 | Hollingsworth & Vose Company | Fibrillated fibers for liquid filtration media |
| US10610813B2 (en) | 2004-11-05 | 2020-04-07 | Donaldson Company, Inc. | Filter medium and breather filter structure |
| USRE49097E1 (en) | 2004-11-05 | 2022-06-07 | Donaldson Company, Inc. | Filter medium and structure |
-
1992
- 1992-10-15 JP JP27647792A patent/JP3305372B2/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10610813B2 (en) | 2004-11-05 | 2020-04-07 | Donaldson Company, Inc. | Filter medium and breather filter structure |
| USRE49097E1 (en) | 2004-11-05 | 2022-06-07 | Donaldson Company, Inc. | Filter medium and structure |
| US11504663B2 (en) | 2004-11-05 | 2022-11-22 | Donaldson Company, Inc. | Filter medium and breather filter structure |
| JP2007021400A (en) * | 2005-07-19 | 2007-02-01 | Toray Ind Inc | Filter |
| JP2007113135A (en) * | 2005-10-19 | 2007-05-10 | Daifuku Paper Mfg Co Ltd | Filter paper for liquid filtration and method for producing the filter paper for liquid filtration |
| JP2007167788A (en) * | 2005-12-22 | 2007-07-05 | Toyota Boshoku Corp | Filter medium for filter, filter for fluid filtration, and oil filter for engine |
| JP4558640B2 (en) * | 2005-12-22 | 2010-10-06 | トヨタ紡織株式会社 | Filter media, fluid filter, and engine oil filter |
| JP2011045825A (en) * | 2009-08-26 | 2011-03-10 | Denso Corp | Filter medium for fuel filter |
| EP2864019A4 (en) * | 2012-06-20 | 2016-06-29 | Hollingsworth & Vose Co | Fibrillated fibers for liquid filtration media |
| US10322380B2 (en) | 2012-06-20 | 2019-06-18 | Hollingsworth & Vose Company | Fibrillated fibers for liquid filtration media |
| US11247182B2 (en) | 2012-06-20 | 2022-02-15 | Hollingsworth & Vose Company | Fibrillated fibers for liquid filtration media |
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| Publication number | Publication date |
|---|---|
| JP3305372B2 (en) | 2002-07-22 |
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