JP2995596B2 - Hydrophilic cartridge filter and method for producing the same - Google Patents
Hydrophilic cartridge filter and method for producing the sameInfo
- Publication number
- JP2995596B2 JP2995596B2 JP4208442A JP20844292A JP2995596B2 JP 2995596 B2 JP2995596 B2 JP 2995596B2 JP 4208442 A JP4208442 A JP 4208442A JP 20844292 A JP20844292 A JP 20844292A JP 2995596 B2 JP2995596 B2 JP 2995596B2
- Authority
- JP
- Japan
- Prior art keywords
- hydrophilic
- heat
- cartridge filter
- porous membrane
- sealed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- Separation Using Semi-Permeable Membranes (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、水系液体を濾過するの
に使用される親水性カ−トリッジフィルタ−に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydrophilic cartridge filter used for filtering an aqueous liquid.
【０００２】[0002]
【従来技術】親水性多孔質膜は、水系液体を濾過する場
合、使用前にアルコ−ル等で一時的に親水化処理する必
要がないため、カ−トリッジフィルタ−など広範囲にわ
たる分野で利用されている。しかし親水性多孔質膜に
は、これをプリ−ツ状に折り曲げ、両側端部を熱融着
し、その円筒型の筒両端をポリプロピレン、テトラフル
オロエチレン−パ−フルオロアルキルビニルエ−テル共
重合体等の疎水性高分子より成るエンドキャップと熱融
着シ−ルしてカ−トリッジフィルタ−を組み立てる工程
において、膜の熱融着シ−ル部分が高温に加熱されて疎
水化し、水での完全性試験ができなくなるという難点が
ある。なおここで「完全性試験」とは、カ−トリッジフ
ィルタ−の膜性能およびシ−ル性が完全か否かを非破壊
的に確認する試験のことであり、最も知られているもの
として「バブル・ポイント試験」（ＪＩＳ Ｋ ３８４
２）がある。そして上記難点を解消する対策としては、
特公表昭５９−５０１２５１（微孔性フィルタ−膜を有
するフィルタ−要素）に示される、膜の熱融着シ−ル部
分に非多孔質テ−プを貼付けて一体成形したり、あるい
は熱や圧力によって膜を非多孔質化して成形するなどの
手段が取られて来た。2. Description of the Related Art A hydrophilic porous membrane is used in a wide range of fields such as a cartridge filter because it is not necessary to temporarily perform a hydrophilic treatment with an alcohol or the like before use when filtering an aqueous liquid. ing. However, the hydrophilic porous membrane is bent into a pleated shape, both ends are heat-sealed, and both ends of the cylindrical tube are co-polymerized with polypropylene and tetrafluoroethylene-perfluoroalkylvinyl ether. In the process of assembling the cartridge filter by heat sealing with an end cap made of a hydrophobic polymer such as a coalesced polymer, the heat sealing seal portion of the film is heated to a high temperature to become hydrophobic, and is treated with water. Has the drawback that the integrity test cannot be performed. Here, the "integrity test" is a test for non-destructively confirming whether or not the film performance and the sealability of the cartridge filter are perfect. Bubble Point Test ”(JIS K 384
There is 2). And as a measure to solve the above difficulties,
As disclosed in Japanese Patent Publication No. 59-501251 (a filter element having a microporous filter), a non-porous tape is stuck to the heat-sealing seal portion of the membrane to form a single piece. Means have been taken such as making the membrane non-porous by pressure and molding.
【０００３】[0003]
【発明が解決しようとする課題】しかしながらこのよう
な手段は、工程に複雑さをもたらすため生産性が悪く、
コストアップにもつながり、さらにはカ−トリッジフィ
ルタ−の透水性にも影響するなどあまり歓迎されていな
い現状にある。本発明は、このような観点から、プリ−
ツ円筒状に成形する際、加熱により親水性が失われる親
水性多孔質膜の両側端部と両筒端部（エンドキャップへ
の熱融着シ−ル部）あるいは両筒端部のみを熱から保護
し、疎水化を免れることにより水による完全性試験を可
能とし、且つ流量特性に優れた親水性カ−トリッジフィ
ルタ−を提供しようとする。However, such a method has a low productivity because of the complexity of the process.
The situation is not so welcomed because it leads to an increase in cost and further affects the water permeability of the cartridge filter. The present invention, from such a viewpoint,
When molding into a cylindrical shape, heat is applied to both ends of the hydrophilic porous membrane, which loses hydrophilicity due to heating, and both ends (heat-sealing seal part to the end cap) or only both ends. It is intended to provide a hydrophilic cartridge filter which protects from water and avoids hydrophobicity, enables an integrity test with water, and has excellent flow characteristics.
【０００４】[0004]
【課題を解決するための手段】上記目的を達成するた
め、本発明の第一の態樣は、加熱により親水性が失われ
るプリ−ツ状親水性多孔質膜の円筒型１の両側端部１
ａ、１ｂ同士を熱融着し、また両筒端部１ｃ、１ｄを疎
水性高分子材質のエンドキャップ２と熱融着するに際
し、前記両側端部１ａ、１ｂ及び両筒端部１ｃ、１ｄの
熱融着部分を予めポリビニ−ルアルコ−ルにて被覆して
おき、そのポリビニ−ルアルコ−ル被覆層３を介して熱
融着シ−ルすることを特徴とする親水性カ−トリッジフ
ィルタ−の製造法であり、またこのように加熱により親
水性が失われるプリ−ツ状親水性多孔質膜１の両側端部
１ａ、１ｂ及び両筒端部１ｃ、１ｄにポリビニ−ルアル
コ−ルの被覆層３を形成して、前記両側端部１ａ、１ｂ
を熱融着し、また前記両筒端部１ｃ、１ｄを疎水性高分
子材質のエンドキャップ２に熱融着して一体接合して得
た親水性カ−トリッジフィルタ−である。さらに本発明
の第二の態樣は、加熱により親水性が失われる親水性多
孔質膜１のプリ−ツ円筒型の両筒端部１ｃ、１ｄを疎水
性高分子材質のエンドキャップ２と熱融着するに際し、
前記両筒端部１ｃ、１ｄの熱融着部分を予めポリビニ−
ルアルコ−ルにて被覆しておき、そのポリビニ−ルアル
コ−ル被覆層３を介して熱融着シ−ルすることを特徴と
する親水性カ−トリッジフィルタ−の製造法であり、
またこのように加熱により親水性が失われる親水性多孔
質膜１のプリ−ツ円筒型のの両筒端部１ｃ、１ｄにポリ
ビニ−ルアルコ−ルの被覆層３を形成して、前記両筒端
部１ｃ、１ｄを疎水性高分子材質のエンドキャップ２に
熱融着して一体接合して得た親水性カ−トリッジフィル
タ−である。親水性多孔質膜としては、疎水性多孔質膜
を製膜後に親水化処理したポリテトラフルオロエチレン
膜や膜自体が親水性であるナイロン膜が挙げられ、前者
を利用した場合は上記第一の発明の態樣が、後者を利用
した場合は上記第二の発明の態樣が適用される。In order to achieve the above object, according to a first aspect of the present invention, there are provided a pleated hydrophilic porous membrane whose hydrophilicity is lost by heating, and both end portions of the cylindrical mold 1. 1
a and 1b are heat-sealed to each other, and both ends 1c and 1d are heat-sealed to an end cap 2 made of a hydrophobic polymer. A hydrophilic cartridge filter characterized in that the heat-sealed portion is coated in advance with a polyvinyl alcohol, and heat-sealed through the polyvinyl alcohol coating layer 3. And coating both sides 1a and 1b and both cylindrical ends 1c and 1d of the pleated hydrophilic porous membrane 1 whose hydrophilicity is lost by heating with polyvinyl alcohol. The layer 3 is formed, and the both end portions 1a and 1b are formed.
And a hydrophilic cartridge filter obtained by heat-sealing the two cylindrical ends 1c and 1d to an end cap 2 made of a hydrophobic polymer material and joining them together. Further, according to the second aspect of the present invention, the pleated cylindrical ends 1c and 1d of the hydrophilic porous membrane 1 whose hydrophilicity is lost by heating are connected to the end cap 2 made of a hydrophobic polymer material. When fusing,
The heat-sealed portions of the ends 1c and 1d of the two cylinders are previously
A method for producing a hydrophilic cartridge filter, characterized in that the filter is coated with a rualcoal and then heat-sealed through the polyvinyl alcohol coating layer 3.
Further, a coating layer 3 of polyvinyl alcohol is formed on both ends of the pleated cylindrical cylinder 1c and 1d of the hydrophilic porous membrane 1 whose hydrophilicity is lost by heating. This is a hydrophilic cartridge filter obtained by heat-sealing the ends 1c and 1d to an end cap 2 made of a hydrophobic polymer material and joining them together. Examples of the hydrophilic porous membrane include a polytetrafluoroethylene membrane that has been subjected to a hydrophilic treatment after forming a hydrophobic porous membrane, and a nylon membrane in which the membrane itself is hydrophilic. When the latter aspect is used, the second aspect is applied.
【０００５】より詳しくは、プリ−ツ状に折り曲げられ
た、加熱により親水性が失われる親水性多孔質膜である
親水化ポリテトラフルオロエチレン膜の両側端部を熱融
着シ−ルすることにより円筒型に成形する工程、またそ
の円筒型の両筒端部を疎水性高分子材質のエンドキャッ
プに熱融着して一体接合化を図る工程において、膜が高
温に加熱される部分に予めポリビニ−ルアルコ−ル水溶
液あるいはポリビニ−ルアルコ−ルの水−アルコ−ル混
合液を塗付又はこれに浸漬し、後乾燥することによりポ
リビニ−ルアルコ−ル被覆層を形成する。そしてこの被
覆層を介して上記二つの部分の熱融着シ−ル工程を行な
う。あるいはまた、プリ−ツ状に折り曲げられた、加熱
により親水性が失われる親水性多孔質膜であるナイロン
膜の円筒型の両筒端部を疎水性高分子材質のエンドキャ
ップに熱融着して一体接合化を図る工程において、膜が
高温に加熱される部分に予めポリビニ−ルアルコ−ル水
溶液あるいはポリビニ−ルアルコ−ルの水−アルコ−ル
混合液を塗付又はこれに浸漬し、後乾燥することにより
ポリビニ−ルアルコ−ル被覆層を形成する。そしてこの
被覆層を介して上記部分の熱融着シ−ル工程を行なう。
そしてこれらにより、膜の熱融着部分が熱から保護さ
れ、疎水化することなく後の水による完全性試験を可能
にする。More specifically, both ends of a hydrophilic polytetrafluoroethylene membrane, which is a hydrophilic porous membrane which is bent into a pleated shape and loses hydrophilicity by heating, are heat-sealed. In the step of forming into a cylindrical shape by heat treatment, and in the step of thermally bonding both end portions of the cylindrical shape to an end cap made of a hydrophobic polymer material to achieve integral joining, a portion where the film is heated to a high temperature is An aqueous polyvinyl alcohol solution or a mixed solution of polyvinyl alcohol and water / alcohol is applied or immersed in the aqueous solution and then dried to form a polyvinyl alcohol coating layer. Then, through the coating layer, the above two portions are subjected to a heat sealing process. Alternatively, both cylindrical ends of a nylon membrane, which is a hydrophilic porous membrane which loses hydrophilicity by heating when folded in a pleated shape, are thermally fused to an end cap made of a hydrophobic polymer material. In the step of achieving integral bonding by coating, an aqueous solution of polyvinyl alcohol or a mixed solution of water and alcohol of polyvinyl alcohol is applied or immersed in advance in a portion where the film is heated to a high temperature, and then dried. Thus, a polyvinyl alcohol coating layer is formed. Then, a heat-sealing sealing step of the above portion is performed through the coating layer.
These protect the heat-sealed portion of the membrane from heat and allow for later integrity testing with water without hydrophobization.
【０００６】[0006]
【実施例１】孔径０．２μｍ、ジャパンゴアテックス製
親水化ポリテトラフルオロエチレン膜の両面に支持体４
としてポリプロピレン不織布シンテックスＰＫ１０８Ｎ
（目付４０ｇ／ｍ2 三井石油化学製）を重ね合わせ、プ
リ−ツ状に折り曲げ、その両側端部にポリビニ−ルアル
コ−ル（品番ＰＡ−１８、ケン化度８８±１％、信越化
学製）の二重量％水溶液を塗付し、６０℃で１２時間乾
燥後ヒ−トシ−ラ−（富士インパルス製）で熱融着シ−
ルし、円筒状に成形した。そしてさらにその両筒端部を
上記溶液中に浸漬し、６０℃で１２時間乾燥後ポリプロ
ピレン製のエンドキャップに熱融着シ−ルして一体接合
したカ−トリッジフィルタ−を得る。Example 1 A support 4 was provided on both sides of a hydrophilic polytetrafluoroethylene membrane manufactured by Japan Gore-Tex having a pore size of 0.2 μm.
As polypropylene nonwoven syntex PK108N
Superimposing (basis weight 40 g / m 2 made by Mitsui Petrochemical), pre - tree shape bending, polyvinyl its both side ends - Ruaruko - Le (No. PA-18, saponification degree 88 ± 1%, manufactured by Shin-Etsu Chemical) And dried at 60 ° C. for 12 hours, and then heat-sealed with a heat sealer (manufactured by Fuji Impulse).
And molded into a cylindrical shape. Then, both ends of the cylinder are immersed in the above solution, dried at 60 ° C. for 12 hours, and heat-sealed to an end cap made of polypropylene to obtain a cartridge filter integrally joined.
【０００７】[0007]
【実施例２】湿式相分離法（例えば特開昭６３−４１５
４５「ポリアミド微多孔性膜の製造法」）により作製し
た孔径０．２μｍ、ナイロンメンブレンの両面に支持体
４としてポリエチレンテレフタレ−ト不織布アクスタ−
Ｈ５０５−１０（目付５０ｇ／ｍ2 東レ製）を重ね合わ
せ、プリ−ツ状に折り曲げ、その両側端部をヒ−トシ−
ラ−（富士インパルス製）で直接熱融着シ−ルし、円筒
状に成形した。そしてその両筒端部にポリビニ−ルアル
コ−ル（品番ＰＡ−１８、ケン化度８８±１％、信越化
学製）の二重量％水溶液を注射器を用いて染込ませ、６
０℃で１２時間乾燥後両筒端部をポリプロピレン製のエ
ンドキャップに熱融着シ−ルして一体接合したカ−トリ
ッジフィルタ−を得る。Embodiment 2 Wet phase separation method (for example, JP-A-63-415)
45 "Production method of polyamide microporous membrane"), a polyethylene terephthalate nonwoven fabric nonwoven fabric as support 4 on both sides of a nylon membrane having a pore diameter of 0.2 µm.
H505-10 superposed (basis weight 50 g / m 2 manufactured by Toray Industries), pre - tree shape bending, heat the side edge portions - city -
It was directly heat-sealed with a rar (manufactured by Fuji Impulse) and formed into a cylindrical shape. A double-aqueous% aqueous solution of polyvinyl alcohol (product number PA-18, degree of saponification: 88 ± 1%, manufactured by Shin-Etsu Chemical Co., Ltd.) was impregnated into both ends of the cylinder using a syringe.
After drying at 0 ° C. for 12 hours, both ends of the cylinder are heat-sealed to an end cap made of polypropylene to obtain a cartridge filter integrally joined.
【０００８】[0008]
【比較実績】上記実施例１と２を夫々の比較例と対比測
定した結果は次の通りである。 （単位 Ｋｇ／ｃｍ2 ） 水Ｂ．Ｐ． ＩＰＡ置換水Ｂ．Ｐ． 原反の水Ｂ．Ｐ． 実施例１ ３．８ ３．８ ３．８ 比較例１ ０．１＞ ３．８ ３．８ 実施例２ ３．５ ３．５ ３．５ 比較例２ ０．１＞ ３．５ ３．５ ＊比較例１、２は夫々実施例１、２においてポリビニ−
ルアルコ−ル処理を施さない場合 比較例１、２は、水Ｂ．Ｐ．値が０．１Ｋｇ／ｃｍ2 以
下であり、それを一度ＩＰＡで完全に濡らし、水に置換
してＢ．Ｐ．を測定すると、原反の水Ｂ．Ｐ．と同じ値
になることから、膜の一部が疎水化していることが明ら
かである。[Comparative results] The results of comparison of the above Examples 1 and 2 with the respective comparative examples are as follows. (Unit Kg / cm 2 ) Water B. P. IPA-substituted water B. P. Raw water B. P. Example 1 3.8 3.8 3.8 Comparative Example 1 0.1> 3.8 3.8 Example 2 3.5 3.5 3.5 Comparative Example 2 0.1> 3.5 3.5 * Comparative Examples 1 and 2 are the same as those of Examples 1 and 2, respectively.
When no alcohol treatment was performed, Comparative Examples 1 and 2 were prepared using water B. P. The value is 0.1 kg / cm 2 or less, which is completely wetted once with IPA, replaced with water, and P. Is measured, the raw water B. P. It is clear that a part of the film has been hydrophobized from the same value.
【０００９】[0009]
【発明の効果】以上のように本発明によれば、プリ−ツ
円筒状に成形した、加熱により親水性が失われる親水性
多孔質膜の両側端熱融着シ−ル部及びエンドキャップへ
の熱融着シ−ル部を熱から保護し、疎水化を免れること
により、水による完全性試験を可能とし、且つ流量特性
に優れた親水性カ−トリッジフィルタ−を提供するもの
としてまことに有利なものである。As described above, according to the present invention, heat-sealing seals and end caps at both ends of a hydrophilic porous membrane formed into a pleated cylindrical shape, which loses hydrophilicity by heating, are formed. It is very advantageous to provide a hydrophilic cartridge filter which protects the heat-sealing seal portion from heat and avoids hydrophobization, enables an integrity test with water, and has excellent flow characteristics. It is something.
【図１】支持体に挟まれプリ−ツ状に折り曲げられた、
加熱により親水性が失われる親水性多孔質膜のみの斜視
図FIG. 1 is sandwiched between supports and bent into a pleated form;
Perspective view of only a hydrophilic porous membrane whose hydrophilicity is lost by heating
【図２】本発明によって得られた親水性カ−トリッジフ
ィルタ−の一部切開斜視図FIG. 2 is a partially cutaway perspective view of a hydrophilic cartridge filter obtained by the present invention.
１ 親水性多孔質膜のプリ−ツ円筒型 １ａ、１ｂ その両側端部 １ｃ、１ｄ その両筒端部 ２ エンドキャップ ３ ポリビニ−ルアルコ−ル被覆層 ４ 膜支持体 DESCRIPTION OF SYMBOLS 1 Pleated cylindrical type of hydrophilic porous membrane 1a, 1b Both ends 1c, 1d Both ends 2 End cap 3 Polyvinyl alcohol coating layer 4 Membrane support
Claims (8)
親水性多孔質膜（１）の両側端部（１ａ）、（１ｂ）同
士を熱融着し、また両筒端部（１ｃ）、（１ｄ）を疎水
性高分子材質のエンドキャップ（２）と熱融着するに際
し、前記両側端部（１ａ）、（１ｂ）及び両筒端部（１
ｃ）、（１ｄ）の熱融着部分を予めポリビニ−ルアルコ
−ルにて被覆しておき、そのポリビニ−ルアルコ−ル被
覆層（３）を介して熱融着シ−ルすることを特徴とする
親水性カ−トリッジフィルタ−の製造法。1. A pleated hydrophilic porous membrane (1), whose hydrophilicity is lost by heating, is heat-sealed to both side ends (1a) and (1b) of each other, and both cylindrical ends (1c). , (1d) and the end caps (2) made of a hydrophobic polymer, the two end portions (1a) and (1b) and the two end portions (1
c) and (1d), wherein the heat-sealed portion is coated in advance with a polyvinyl alcohol, and the heat-sealed seal is applied via the polyvinyl alcohol coating layer (3). Of producing a hydrophilic cartridge filter.
トラフルオロエチレン膜である請求項１の親水性カ−ト
リッジフィルタ−の製造法。2. The method for producing a hydrophilic cartridge filter according to claim 1, wherein the hydrophilic porous membrane (1) is a hydrophilized polytetrafluoroethylene membrane.
質膜（１）のプリ−ツ円筒型の両筒端部（１ｃ）、（１
ｄ）を疎水性高分子材質のエンドキャップ（２）と熱融
着するに際し、前記両筒端部（１ｃ）、（１ｄ）の熱融
着部分を予めポリビニ−ルアルコ−ルにて被覆してお
き、そのポリビニ−ルアルコ−ル被覆層（３）を介して
熱融着シ−ルすることを特徴とする親水性カ−トリッジ
フィルタ−の製造法。3. The pleated cylindrical ends (1c), (1) of a hydrophilic porous membrane (1) whose hydrophilicity is lost by heating.
In heat-sealing d) with the end cap (2) made of a hydrophobic polymer material, the heat-sealed portions of the two cylindrical ends (1c) and (1d) are previously covered with polyvinyl alcohol. A method for producing a hydrophilic cartridge filter, wherein heat sealing is performed via the polyvinyl alcohol coating layer (3).
ある請求項３の親水性カートリッジフィルター及びその
製造法。4. The hydrophilic cartridge filter according to claim 3 , wherein the hydrophilic porous membrane (1) is a nylon membrane.
親水性多孔質膜（１）の両側端部（１ａ）、（１ｂ）及
び両筒端部（１ｃ）、（１ｄ）にポリビニ−ルアルコ−
ルの被覆層（３）を形成して、前記両側端部（１ａ）、
（１ｂ）を熱融着し、また前記両筒端部（１ｃ）、（１
ｄ）を疎水性高分子材質のエンドキャップ（２）に熱融
着して一体接合したことを特徴とする親水性カ−トリッ
ジフィルタ−。5. A plywood-like hydrophilic porous membrane (1), whose hydrophilicity is lost by heating, is provided on both sides (1a) and (1b) and both ends (1c) and (1d) of polyvinyl chloride. Luarco-
Forming a coating layer (3) on the both ends (1a),
(1b) is heat-sealed, and both ends (1c), (1c)
A hydrophilic cartridge filter wherein d) is heat-sealed and integrally joined to an end cap (2) made of a hydrophobic polymer material.
トラフルオロエチレン膜である請求項５の親水性カ−ト
リッジフィルタ−。6. The hydrophilic cartridge filter according to claim 5, wherein the hydrophilic porous membrane (1) is a hydrophilized polytetrafluoroethylene membrane.
質膜（１）のプリ−ツ円筒型の両筒端部（１ｃ）、（１
ｄ）にポリビニ−ルアルコ−ルの被覆層（３）を形成し
て、前記両筒端部（１ｃ）、（１ｄ）を疎水性高分子材
質のエンドキャップ（２）に熱融着して一体接合したこ
とを特徴とする親水性カ−トリッジフィルタ−。7. Both ends (1c), (1c) of a pleated cylindrical type of a hydrophilic porous membrane (1) whose hydrophilicity is lost by heating.
d) forming a coating layer of polyvinyl alcohol (3), and heat-sealing the two cylindrical ends (1c) and (1d) to an end cap (2) made of a hydrophobic polymer material; A hydrophilic cartridge filter characterized by being bonded.
ある請求項７の親水性カ−トリッジフィルタ−。8. The hydrophilic cartridge filter according to claim 7, wherein the hydrophilic porous membrane (1) is a nylon membrane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4208442A JP2995596B2 (en) | 1992-07-13 | 1992-07-13 | Hydrophilic cartridge filter and method for producing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4208442A JP2995596B2 (en) | 1992-07-13 | 1992-07-13 | Hydrophilic cartridge filter and method for producing the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06277466A JPH06277466A (en) | 1994-10-04 |
| JP2995596B2 true JP2995596B2 (en) | 1999-12-27 |
Family
ID=16556283
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4208442A Expired - Lifetime JP2995596B2 (en) | 1992-07-13 | 1992-07-13 | Hydrophilic cartridge filter and method for producing the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2995596B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4339810C1 (en) * | 1993-11-23 | 1994-12-08 | Seitz Filter Werke | Process for the partial modification of porous, hydrophilic filter membranes, post-treated filter membranes and filtration modules fitted therewith, in particular filter candles |
| DE19543955C2 (en) * | 1995-11-25 | 1998-12-24 | Sartorius Gmbh | Integrity testable filtration unit with hydrophilic, porous membranes |
| JP4820612B2 (en) * | 2005-09-21 | 2011-11-24 | 富士フイルム株式会社 | Microfiltration membrane cartridge filter |
-
1992
- 1992-07-13 JP JP4208442A patent/JP2995596B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06277466A (en) | 1994-10-04 |
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