JPS6242715A - Composite material for electret filter having antibacterial property - Google Patents

Composite material for electret filter having antibacterial property

Info

Publication number
JPS6242715A
JPS6242715A JP60179026A JP17902685A JPS6242715A JP S6242715 A JPS6242715 A JP S6242715A JP 60179026 A JP60179026 A JP 60179026A JP 17902685 A JP17902685 A JP 17902685A JP S6242715 A JPS6242715 A JP S6242715A
Authority
JP
Japan
Prior art keywords
nonwoven fabric
electret
electret filter
filter
antibacterial agent
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.)
Pending
Application number
JP60179026A
Other languages
Japanese (ja)
Inventor
Takahiro Akamoto
赤本　隆弘
Takumi Minagawa
卓己 皆川
Noboru Ishizaka
石坂　昇
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toyobo Co Ltd
Original Assignee
Toyobo Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toyobo Co Ltd filed Critical Toyobo Co Ltd
Priority to JP60179026A priority Critical patent/JPS6242715A/en
Publication of JPS6242715A publication Critical patent/JPS6242715A/en
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/04—Additives and treatments of the filtering material
    • B01D2239/0435—Electret
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/04—Additives and treatments of the filtering material
    • B01D2239/0442—Antimicrobial, antibacterial, antifungal additives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
    • B01D2239/065—More than one layer present in the filtering material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
    • B01D2239/065—More than one layer present in the filtering material
    • B01D2239/0659—The layers being joined by needling

Abstract

PURPOSE:To control the propagation of collected microbes without deteriorating the dust collection efficiency and pressure drop of an electret filter by laminating a nonwoven fabric treated with an antibacterial agent at least one surface of the nonwoven fabric for an electret filter. CONSTITUTION:The nonwoven fabric 1 is composed of a polymeric dielectric fiber applied with an electret-forming treatment and the thickness is controlled to 2-3mm. A nonwoven fabric 2 treated with an antibacterial agent is laminated and formed on one or both surfaces of the nonwoven fabric 1 for an electret filter. The nonwoven fabric 2 is composed of polyester fibers, polypropylene fibers, rayon fibers or their mixture. The treatment with the antibacterial agent can be carried out before or after the nonwoven fabric is produced and 0.1-1wt% agent is incorporated into 100wt% nonwoven fabric.

Description

【発明の詳細な説明】 （産業上の利用分野） 本発明は掃除機、空気清浄機、冷暖房機等の除塵フィル
ターに使用されるエレクトレットフィルター材料の改良
に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to improvement of electret filter materials used in dust removal filters for vacuum cleaners, air purifiers, air conditioners, etc.

（従来の技術） 従来、エレクトレットフィルターは大気中の煤煙や塵埃
粒子、黒カビ等を電気的（分極力、クーロン力による）
に吸着し、捕集するための各種機器における除塵フィル
ターとして用いられているが、捕集物中に微生物か存在
する場合にはそれが増殖し、その結果エレクトレットフ
ィルターの′域気的効力が低下したり、付着物の腐敗や
悪臭が発生する等の欠点があった。(Conventional technology) Conventionally, electret filters remove soot, dust particles, black mold, etc. from the atmosphere electrically (using polarization force and Coulomb force).
The electret filter is used as a dust removal filter in various devices to adsorb and collect electrets, but if there are microorganisms in the collected material, they will multiply, resulting in a decrease in the electret filter's atmospheric effectiveness. However, there were disadvantages such as rotting deposits and the generation of bad odors.

（発明が解決しようとする問題点） 本発明はエレクトレットフィルターの除塵効果や圧力損
失を伴うことなく、フィルターが捕集した微生物の増殖
を効果的に抑制することを目的とするものである。(Problems to be Solved by the Invention) The object of the present invention is to effectively suppress the growth of microorganisms collected by the filter without causing the dust removal effect or pressure loss of the electret filter.

（問題を解決するための手段） 本発明はエレクトレット化フィルター用不織布の少なく
とも一面に抗菌剤加工を施した不織布を重ね合わせたこ
とを特徴とする抗菌性を有するエレクトレットフィルタ
ー用複合材料を提供するものである。(Means for Solving the Problems) The present invention provides a composite material for electret filters having antibacterial properties, characterized in that a nonwoven fabric treated with an antibacterial agent is superimposed on at least one surface of a nonwoven fabric for electret filters. It is.

以下図面に示した実施例について本発明をより詳細に説
明する。The present invention will be explained in more detail below with reference to embodiments shown in the drawings.

本発明で用いられるエレクトレット化フィルター用不織
布ｌ（一般に厚さは２〜３ｍである）はエレクトレット
化処理を施された高分子誘電体繊維より構成されるもの
であり、その分極力またはクーロン力書こより微細な粒
子を吸着し、捕集するものである。かかるエレクトレッ
ト化フィルター用不噛布自体のｍ遺失および用法はすで
によく知られているところである。The electret filter nonwoven fabric l (generally 2 to 3 m thick) used in the present invention is composed of polymeric dielectric fibers that have been subjected to electret treatment, and its polarization force or Coulomb force is It adsorbs and collects finer particles. The properties and usage of such non-chewing fabrics for electret filters are already well known.

本発明はかかるエレクトレット化フィルター用不＃ｄｌ
布の一面（第１図）または両面（第２図）に抗菌性加工
を施した不織布２を重ね合わせて取付けたことを特徴と
するものである。The present invention is directed to such an electret filter.
It is characterized in that a nonwoven fabric 2 that has been treated with antibacterial properties is attached to one side (FIG. 1) or both sides (FIG. 2) of the fabric.

かかる不織布２はポリエステル、ポリプロピレン、レー
ヨンなどの繊維の単独または混合物から構成されて奢り
、その着炭は一般には１０乃至６０　ＳＩＬ／ｄ、好ま
しくは１０〜３０Ｐ／ｌｒｉとする。この不織布２の抗
菌剤処理は不織布製造の前後いずれでも実施できる。例
えば不織布製造用の繊維製造段階でローラーやガイドに
より抗菌剤をオイリングと同じ要領で付与し、またはＳ
維塊にスプレーまたはディッピング法で抗−剤を付与し
、その後にかかる＃Ｉ維材料を用いて常法により不織布
を製造する。または、常法により製造した不織布にパッ
ド法（マングル絞り）、スプレー法、グラビアコート法
など適当な手段で抗菌剤を付与すればよい。The nonwoven fabric 2 is composed of fibers such as polyester, polypropylene, rayon, etc. alone or in combination, and its carbonization is generally 10 to 60 SIL/d, preferably 10 to 30 P/lri. This antibacterial treatment of the nonwoven fabric 2 can be carried out either before or after manufacturing the nonwoven fabric. For example, antibacterial agents are applied in the same way as oiling using rollers or guides during the fiber manufacturing stage for nonwoven fabric manufacturing, or S
An anti-agent is applied to the fibrous mass by spraying or dipping, and then a nonwoven fabric is manufactured using the #I fiber material by a conventional method. Alternatively, an antibacterial agent may be applied to a nonwoven fabric produced by a conventional method by an appropriate method such as a pad method (mangle squeezing), a spray method, or a gravure coating method.

抗菌剤としては公知のものを使用できる。その例として
は、有機シリコーン第４級アンモニウム塩、例えば ＯＨ。Known antibacterial agents can be used. Examples include organosilicone quaternary ammonium salts such as OH.

なる構造を有する３−トリメトキシシリル−プロピル−
ジメチル−オクタデシル−アンモニウムクロライド（商
品名ＤＯ５７００、ダウコーニング社）、ハロゲン化芳
香族化合物、例えばＯＨ ｌ なる構造を有する２、４．４’−トリクロロ−２１−ヒ
ドロキシジフェニルエーテル（商品名イルガなる構造を
有するＴＢＳサイアペンダゾール、１１ＨＭｕ なる構造を有するビグアナイト（ＥｉｇｕａｚｈｉｃＬ
θ）等があげられる。3-trimethoxysilyl-propyl- having the structure
Dimethyl-octadecyl-ammonium chloride (trade name: DO5700, Dow Corning), halogenated aromatic compounds, such as 2,4,4'-trichloro-21-hydroxydiphenyl ether having the structure of OH l (trade name: having the structure of Irga) TBS thiapendazole, biguanite (EiguazhicL) with a structure of 11HMu
θ) etc.

かかる抗菌剤は液状で上述の如く付与されるが、付着後
に乾燥しく例えば８０〜１３０℃の温度で乾燥）、繊維
上に固着させる。固着量は抗菌剤の種類、ｍ維の種類、
不織布の厚さ等により適度に変化させつるが普通は不織
布繊維に対し０．１乃至１．０％（重量）とする。Such an antibacterial agent is applied in liquid form as described above, but after being applied, it is dried (for example, at a temperature of 80 to 130° C.) and fixed onto the fibers. The amount of adhesion depends on the type of antibacterial agent, the type of m-fiber,
The content may be changed appropriately depending on the thickness of the nonwoven fabric, etc., but it is usually 0.1 to 1.0% (by weight) based on the nonwoven fabric fibers.

またエレクトレット化フィルター用不織布１に抗菌加工
不織イ５２を重ね合わせて取付ける方法としては、ニー
ドルパンチ法、接着剤による接合、４着による方法、単
に重ね合わせる方法等を採用しつるかフィルター全体の
圧損を少なくする点ではニードルパンチ法によるのが好
ましい。In addition, as a method of overlapping and attaching the antibacterial treated nonwoven material 52 to the electret filter nonwoven material 1, the needle punching method, bonding with adhesive, method using four layers, simply overlapping method, etc. are adopted. In terms of reducing pressure loss, it is preferable to use the needle punch method.

このようにエレクトレット化フィルター用不織布の少な
くとも一面に抗菌剤加工を施した不織布を重ね合わせて
なる複合材料を掃除機、空気清浄機、冷暖房機等のフィ
ルター材として用いた場合、圧力損失を伴うことなく、
大気中の煤煙、４埃粒子、カビ、微生物等を電気的に吸
着、捕集し、さらに捕集した微生物の増殖を抑制するこ
とができるから、従来この檀フィルターにみられた微生
物の増殖に起因する欠点は見服される。When a composite material made by laminating an electret filter nonwoven fabric with a nonwoven fabric treated with an antibacterial agent on at least one side is used as a filter material for vacuum cleaners, air purifiers, air conditioners, etc., pressure loss may occur. Without,
It is possible to electrically adsorb and collect soot, dust particles, mold, microorganisms, etc. in the atmosphere, and further suppress the growth of the collected microorganisms, which prevents the growth of microorganisms that was previously seen in this dandelion filter. The resulting shortcomings will be overlooked.

以下本発明の実施例について説明する。Examples of the present invention will be described below.

実施例 ポリエステル・ポリプロピレン−レーヨン（配合比３０
：３０：４０）かラナル不織布（７０？／ｌｒｉ　）に
３−トリメトキシシリル−プロピル−ジメチル−オクタ
デシル−アンモニウムクロライ「を不稙布繊維重量に対
して０．６３％３％パラマングル絞り・ドライ法で付着
させた。次いでこのように抗菌剤加工した不織布を平均
直径約４０μのエレクトレット繊維（ポリプロピレン）
製の不織布（４００Ｐ／ｄ）の裏面にニードルパンチ法
で貼りつけ複合材料を製造した。Example polyester/polypropylene-rayon (mixing ratio 30
:30:40) or ranal nonwoven fabric (70?/lri) with 3-trimethoxysilyl-propyl-dimethyl-octadecyl-ammonium chloride 0.63% 3% para-mangle squeezing and drying based on the weight of the sterile fabric fibers. The antibacterial-treated nonwoven fabric was then attached to electret fibers (polypropylene) with an average diameter of about 40μ.
A composite material was manufactured by attaching the composite material to the back side of a nonwoven fabric (400P/d) made by the manufacturer, using the needle punch method.

比較例 上記実施例において抗菌剤加工を施さない以外は全く同
様にして複合材料を製造した。Comparative Example A composite material was produced in exactly the same manner as in the above Example except that no antibacterial treatment was applied.

上記の実施例および比較例で得られたエレクトレットフ
ィルター用複合材料を試料としてシェークフラスコ法（
ＡＴＯＯ４３５２）および空気清浄機を使用した方法に
より抗菌性評価を行なった。Using the shake flask method as a sample, the composite materials for electret filters obtained in the above Examples and Comparative Examples were used.
Antibacterial properties were evaluated using a method using ATOO4352) and an air purifier.

すなわち、シェークフラスコ法では−としてクレブシー
ラ・ニューモニア（ＡＴＯＯ４３５２）を用い、次式に
より滅菌率を算出した。That is, in the shake flask method, Klebscilla pneumonia (ATOO4352) was used as -, and the sterilization rate was calculated using the following formula.

−Ｙ 滅菌率（支））、−Ｘ１００ ｘ−−−０時間の菌の数 Ｙ−−−１時間培養後の菌の数 その結果、本発明実施例の材料の場合滅菌率は１００％
であったのに対し、比較例の場合のそれはわずか７％で
あった。-Y Sterilization rate (sub)), -X100 x---Number of bacteria at 0 hours Y---Number of bacteria after 1 hour incubation As a result, the sterilization rate is 100% for the material of the example of the present invention
In contrast, it was only 7% in the comparative example.

次に該フィルター用複合材料を空気清浄機に取付け、黒
カビを散布した部屋で３時間運転した。この時フィルタ
ーを通過する黒カビをエアーサンプラーで調べると非常
にわずかであり、フィルターはほとんどの黒カビを捕集
していた。Next, the filter composite material was attached to an air purifier and operated for 3 hours in a room sprayed with black mold. At this time, when we checked the amount of black mold passing through the filter using an air sampler, we found that it was extremely small, and the filter had captured most of the black mold.

また、この後フィルターを取出し３０℃で３日間培地培
養を行なったところ本発明実施例のものでは黒カビの成
育は認められなかった。これに対し比較例のものでは黒
カビの著しい成育が認められた。Furthermore, when the filter was removed and cultured in a medium for 3 days at 30°C, no growth of black mold was observed in the samples of the examples of the present invention. In contrast, significant growth of black mold was observed in the comparative samples.

なお、実施例および比較例のいずれの材料においても圧
力損失は同じであった。Note that the pressure loss was the same for both the materials of Examples and Comparative Examples.

（発明の効果） このように本発明によるときはエレクトレットフィルタ
ーにより捕集した微生物の増殖は有効に抑制され、この
ためエレクトレットフィルターの電気的効力の低下およ
び付着物の腐敗や不快臭の発生が防止される。(Effects of the Invention) As described above, according to the present invention, the growth of microorganisms collected by the electret filter is effectively suppressed, thereby preventing a decrease in the electrical efficacy of the electret filter, and preventing the rotting of deposits and the generation of unpleasant odors. be done.

【図面の簡単な説明】[Brief explanation of the drawing]

図面は本発明のエレクトレットフィルター用複合材料の
断面略図であり、第１図は抗菌剤加工を施した不織布を
表面に重ね合わせた例、第２図は抗菌剤加工を施した不
織布を表裏両面に重ね合わせた例を示す。 １：エレクトレットフィルター用不織布２：抗菌剤加工
不織布。The drawings are schematic cross-sectional views of the composite material for electret filters of the present invention. Figure 1 shows an example in which a nonwoven fabric treated with an antibacterial agent is laminated on the surface, and Figure 2 shows an example in which a nonwoven fabric treated with an antibacterial agent is layered on both the front and back sides. An example of overlapping is shown. 1: Nonwoven fabric for electret filter 2: Nonwoven fabric treated with antibacterial agent.

Claims (1)

【特許請求の範囲】[Claims] １、エレクトレット化フィルター用不織布の少なくとも
一面に抗菌剤加工を施した不織布を重ね合わせたことを
特徴とする抗菌性を有するエレクトレットフィルター用
複合材料。1. A composite material for electret filters having antibacterial properties, characterized in that a nonwoven fabric treated with an antibacterial agent is superimposed on at least one surface of a nonwoven fabric for electret filters.
JP60179026A 1985-08-14 1985-08-14 Composite material for electret filter having antibacterial property Pending JPS6242715A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP60179026A JPS6242715A (en) 1985-08-14 1985-08-14 Composite material for electret filter having antibacterial property

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP60179026A JPS6242715A (en) 1985-08-14 1985-08-14 Composite material for electret filter having antibacterial property

Publications (1)

Publication Number Publication Date
JPS6242715A true JPS6242715A (en) 1987-02-24

Family

ID=16058813

Family Applications (1)

Application Number Title Priority Date Filing Date
JP60179026A Pending JPS6242715A (en) 1985-08-14 1985-08-14 Composite material for electret filter having antibacterial property

Country Status (1)

Country Link
JP (1) JPS6242715A (en)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0283014U (en) * 1988-12-15 1990-06-27
JPH0411910A (en) * 1990-04-27 1992-01-16 Sanyo Electric Co Ltd Filter unit
WO1998009667A1 (en) * 1996-09-04 1998-03-12 Kimberly-Clark Worldwide, Inc. Antimicrobial medical devices and methods of production and use
WO2001012296A1 (en) * 1999-08-13 2001-02-22 Avecia Limited Air filter
US6383539B1 (en) * 1997-05-28 2002-05-07 Akutagawa Confectionery Co., Ltd. Method of manufacturing decorative food, nozzle assembly and decorative chocolate
EP1310288A1 (en) 2001-11-09 2003-05-14 Nitto Denko Corporation Antibacterial air filter medium and filter unit using the same
JP2003326120A (en) * 2002-05-14 2003-11-18 Toyobo Co Ltd Filter medium
JP2005539160A (en) * 2002-09-16 2005-12-22 トリオシン・ホールディング・インコーポレイテッド Electrostatically charged filter media with activator added
KR100522896B1 (en) * 1998-09-28 2006-03-20 주식회사 새 한 Method for manufacturing antibacterial and deodorant nonwoven fabric with excellent absorption using chitosan
JP2009136736A (en) * 2007-12-05 2009-06-25 Toyobo Co Ltd Electret filter medium and filter unit
JP2009136735A (en) * 2007-12-05 2009-06-25 Toyobo Co Ltd Electret filter medium and filter unit
US8182580B2 (en) 2006-05-18 2012-05-22 Valtion Teknillinen Tutkimuskeskus Filter structure for filtering a particle-containing gas, method of its manufacture and use of porous paper
WO2018036890A1 (en) * 2016-08-26 2018-03-01 Green Impact Holding Ag Wash-durable face mask with antimicrobial properties and/or improved washability
CN111733547A (en) * 2020-06-15 2020-10-02 杨碧丽 Serging machine for spinning

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61280829A (en) * 1985-06-07 1986-12-11 松下電器産業株式会社 Electric cleaner

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61280829A (en) * 1985-06-07 1986-12-11 松下電器産業株式会社 Electric cleaner

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0283014U (en) * 1988-12-15 1990-06-27
JPH0411910A (en) * 1990-04-27 1992-01-16 Sanyo Electric Co Ltd Filter unit
WO1998009667A1 (en) * 1996-09-04 1998-03-12 Kimberly-Clark Worldwide, Inc. Antimicrobial medical devices and methods of production and use
US6383539B1 (en) * 1997-05-28 2002-05-07 Akutagawa Confectionery Co., Ltd. Method of manufacturing decorative food, nozzle assembly and decorative chocolate
KR100522896B1 (en) * 1998-09-28 2006-03-20 주식회사 새 한 Method for manufacturing antibacterial and deodorant nonwoven fabric with excellent absorption using chitosan
CN100361727C (en) * 1999-08-13 2008-01-16 奥麒英国杀生剂有限公司 Air filter
WO2001012296A1 (en) * 1999-08-13 2001-02-22 Avecia Limited Air filter
EP1310288A1 (en) 2001-11-09 2003-05-14 Nitto Denko Corporation Antibacterial air filter medium and filter unit using the same
JP2003326120A (en) * 2002-05-14 2003-11-18 Toyobo Co Ltd Filter medium
JP2005539160A (en) * 2002-09-16 2005-12-22 トリオシン・ホールディング・インコーポレイテッド Electrostatically charged filter media with activator added
US8182580B2 (en) 2006-05-18 2012-05-22 Valtion Teknillinen Tutkimuskeskus Filter structure for filtering a particle-containing gas, method of its manufacture and use of porous paper
JP2009136736A (en) * 2007-12-05 2009-06-25 Toyobo Co Ltd Electret filter medium and filter unit
JP2009136735A (en) * 2007-12-05 2009-06-25 Toyobo Co Ltd Electret filter medium and filter unit
WO2018036890A1 (en) * 2016-08-26 2018-03-01 Green Impact Holding Ag Wash-durable face mask with antimicrobial properties and/or improved washability
CN111733547A (en) * 2020-06-15 2020-10-02 杨碧丽 Serging machine for spinning

Similar Documents

Publication Publication Date Title
JPS6242715A (en) Composite material for electret filter having antibacterial property
JP5323876B2 (en) Electrostatically charged filter media with activator added
CN107073161B (en) Porous devices, kits and methods for debridement
JP2010525187A (en) Fibrous article having one or more polyelectrolyte layers thereon and method for making the same
JP2000070646A (en) Air purifying filter member
CN111493418A (en) Nano-diamond mask and preparation method of nano-diamond sterilization fiber cloth
CN112127049A (en) Preparation method of polypropylene melt-blown non-woven fabric material for mask
GB1564413A (en) Filtering equipment with microbicidal filter material for suspended substances
WO2021181345A1 (en) Air filtration system and manufacturing method thereof
CN111729119A (en) Air purification assembly with coronavirus killing function and application thereof
CN111876901A (en) Mask, antibacterial melt-blown non-woven fabric and processing method thereof
JP3947946B2 (en) Filter media
JPS6242716A (en) Filter material for electret filter
JPH1190133A (en) Air cleaning filter
CN213554078U (en) Air purification assembly with coronavirus killing function and air purification device
KR0149989B1 (en) Wool filter for dust protective mask
CN100377760C (en) Electrostatically charged filter media incorporating an active agent
CN1165049A (en) Large-flow dust-filter sterilizing air filter membrane and its manufacturing method
WO2009031944A2 (en) Filtering material for gaseous medium
KR200278590Y1 (en) Filter for dustproof mask
JP2000117025A (en) Filter base material and production thereof and mask
JPH0515485B2 (en)
JPH03186309A (en) Air filter
JP2510587Y2 (en) Sterilizing air filter
JPH0525526B2 (en)