JPH0716411A - Composite filter - Google Patents

Abstract

PURPOSE:To make the attenuation of the quantity of the charge small and to increase the collecting efficiency of dust by laminating a negative charge net and a positive charge net whose surface material is located on the plus side of the negative charge net in the electrification rank alternatively so that they may come into contact with each other. CONSTITUTION:A negative charge net which is electrified at negative polarity and a positive charge net which is electrified at positive polarity and whose surface material is located on the plus side of the negative charge net in the electrification rank are laminated alternately so that the nets may come into contact with each other. For example, a filter consists of three nets where on both the sides of a net electrified at one polarity (inner layer net) 1, nets electrified at the other polarity (outer layer nets) 2, 3 are put and the nets are integrated into one body by a frame body 4. A silicone resin, etc., are preferably used as the positive charge net, and on the other hand, a fluororesin, etc., are preferably used as the negative charge net. In this way, the attenuation of the quantity of the charge is small even when the net is used in an atmosphere of high humidity or washed with water. Therefore, the collecting efficiency of dust is high and stable, and the net has an advantage over nonwoven fabric in air flow resistance and scattering of fiber.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は、荷電された網状のフィ
ルタに関し、特に電荷減衰を制御するために多層構造と
した複合フィルタに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a charged mesh filter, and more particularly to a composite filter having a multilayer structure for controlling charge decay.

【０００２】[0002]

【従来の技術】荷電されたフィルタを用いて塵埃を除去
する技術として、エレクトレット化された不織布のフィ
ルタが提案されている（特公昭５６−４７２９９号公
報）。また、板状或いはシート状の荷電物体の表面電荷
はそのまま空気中に放置しておくと、比較的短時間の間
に減衰してなくなってしまうが、荷電物体をアルミニウ
ムなどの金属箔で覆って密封しておくと、表面電荷の減
衰が有意に抑制されることは知られている。2. Description of the Related Art As a technique for removing dust by using a charged filter, an electretized non-woven fabric filter has been proposed (Japanese Patent Publication No. 56-47299). Also, if the surface charge of a plate-like or sheet-like charged object is left in the air as it is, it will be attenuated and disappear in a relatively short time. However, cover the charged object with a metal foil such as aluminum. It is known that the hermeticity significantly suppresses the decay of the surface charge.

【０００３】[0003]

【発明が解決しようとする課題】しかしながら、不織布
のエレクトレットフィルタは、湿気による帯電量の減衰
が大きいことに加えて、網状のものに比べ通気抵抗が大
きい、使用中にその繊維が飛散し易い、捕集した塵埃を
水洗等の方法で清浄にしてフィルタの再利用を計る際、
塵埃の除去が困難なうえに繊維が脱落し易いなどの欠点
を有する。通気抵抗が大きいフィルタは、送風機のエネ
ルギー消費と騒音の両面から好ましくないことは言うま
でもない。また、荷電物体をアルミニウムなどの金属箔
で覆って密封しておくと、電荷の減衰が有意に抑制され
るという知見に基づき、荷電物体をフィルタ用途で用い
得るように、金属箔の代わりに金網などの金属製多孔体
を採用することも考えられる。しかし、この構造ではほ
とんど効果がないことは、後述の実施例からも明らかで
ある。However, the non-woven electret filter has a large attenuation of the amount of electrification due to moisture, and has a large ventilation resistance as compared with the mesh type, and its fibers are easily scattered during use. When cleaning the collected dust with a method such as washing with water to reuse the filter,
It has the drawback that it is difficult to remove dust and the fibers easily fall off. Needless to say, a filter having a large air flow resistance is not preferable in terms of both energy consumption and noise of the blower. In addition, based on the finding that when a charged object is covered with a metal foil such as aluminum and hermetically sealed, the attenuation of the charge is significantly suppressed, a wire mesh is used instead of the metal foil so that the charged object can be used in a filter application. It is also possible to adopt a metal porous body such as. However, it is clear from the examples described later that this structure has almost no effect.

【０００４】本発明は、上記諸点に鑑みてなされたもの
であり、その目的とするところは、高湿度の雰囲気で用
いてもまた水洗して用いても帯電量の減衰が少なく、し
たがって塵埃の捕集効率が安定して高く、しかも不織布
に比べて通気抵抗と繊維の飛散の点でも有利な荷電され
た網状の複合フィルタを提供することにある。The present invention has been made in view of the above points, and it is an object of the present invention that the amount of charge is not significantly attenuated even when used in a high humidity atmosphere or washed with water, and therefore the amount of dust is reduced. An object of the present invention is to provide a charged reticulated composite filter which has stable and high collection efficiency and is more advantageous than non-woven fabric in terms of ventilation resistance and fiber scattering.

【０００５】[0005]

【課題を解決するための手段】本発明の複合フィルタ
は、上述の課題を解決するためのものであり、負の極性
に帯電している負帯電網と、正の極性に帯電しており該
負帯電網とは表面材質が帯電列においてプラス側に位置
する正帯電網とが交互に少なくとも２層以上、かつ網ど
うしが互いに接触するように積層されていることを特徴
とするものである。The composite filter of the present invention is intended to solve the above-mentioned problems and comprises a negative charging net charged to a negative polarity and a negative charging net charged to a positive polarity. The negative charging net is characterized in that at least two layers of positive charging nets whose surface material is located on the plus side in the charging train are alternately laminated, and the nets are laminated so as to be in contact with each other.

【０００６】本発明の帯電網は、誘電体繊維から形成さ
れた網状物であり、正負いずれかの極性をより強く帯び
ている帯電体である。網の織り方は特に限定されず、例
示すれば平織、綾織、畳織、平畳織、綾畳織、ハニカム
状の織りなどである。該誘電体繊維としては、体積固有
抵抗が１０¹⁰Ω・ｃｍ以上、好ましくは１０¹²Ω・ｃｍ
以上の繊維を用いることができ、特に合成樹脂繊維は、
柔軟性があり且つ単繊維で網を構成できるため、本発明
の目的に特に好ましく用いられ得る。さらに、目開きや
繊維の太さは、フィルタの除塵効率、通気性（圧損）お
よび剛性などを勘案して適宜決定される網の性状であ
る。しかし、網を表現する呼称で言えば、５〜１００メ
ッシュ（繊維の太さにもよるが、目開き４．５〜０．１
５ｍｍ）、特に好ましくは１０〜４０メッシュ（同前、
２．１〜０．５ｍｍ）の網が通常好ましく用いられる。
誘電体繊維は撚糸であってもよい。The charging net of the present invention is a net-like material formed of dielectric fibers, and is a charging member having a stronger positive or negative polarity. The weaving method of the net is not particularly limited, and examples thereof include plain weave, twill weave, tatami weave, plain tatami weave, twill weave, and honeycomb weave. The dielectric fiber has a volume resistivity of 10 ¹⁰ Ω · cm or more, preferably 10 ¹² Ω · cm.
The above fibers can be used, and especially synthetic resin fibers are
Since it is flexible and can form a net with single fibers, it can be particularly preferably used for the purpose of the present invention. Further, the openings and the thickness of the fibers are the properties of the mesh that are appropriately determined in consideration of the dust removal efficiency of the filter, air permeability (pressure loss), rigidity and the like. However, in terms of the name used to express the net, it is 5 to 100 mesh (depending on the thickness of the fiber, the opening is 4.5 to 0.1.
5 mm), particularly preferably 10-40 mesh (same as above,
A mesh of 2.1 to 0.5 mm) is usually preferably used.
The dielectric fiber may be twisted yarn.

【０００７】基本的には、正帯電網の表面材質が負帯電
網のそれとは帯電列においてプラス側に位置していれ
ば、本発明の効果は発現する。これは、異質の網を互い
に接触するように積層しておくことにより網が自己荷電
され、そのため帯電網の電荷の減衰が補償される結果で
あると考えられる。Basically, the effect of the present invention is exhibited when the surface material of the positive charging net is located on the plus side of the negative charging net in the charging train. It is considered that this is because the nets are self-charged by stacking the different nets so that they are in contact with each other, and thus the charge decay of the charged nets is compensated.

【０００８】正負帯電網の表面材質について、好ましく
利用できる具体例を示せば、正帯電網に対してはシリコ
ン樹脂、ポリアミド系樹脂、ポリエステル系樹脂および
ウレタン系樹脂などの正の極性に帯電し易い樹脂材料
（樹脂Ａと称す）であり、一方、負帯電網に対しては弗
素系樹脂、ポリプロピレン系樹脂およびポリエチレン系
樹脂などの負の極性に帯電し易い樹脂材料（樹脂Ｂと称
す）である。本発明の複合フィルタは、上記の好ましい
樹脂材料の組合わせで構成されるのが良い。With respect to the surface material of the positive and negative charging nets, specific examples that can be preferably used will be given. For the positive charging nets, silicon resin, polyamide resin, polyester resin and urethane resin are easily charged to the positive polarity. On the other hand, it is a resin material (referred to as a resin A), while it is a resin material (referred to as a resin B) that is easily charged to a negative polarity such as a fluorine-based resin, a polypropylene-based resin and a polyethylene-based resin with respect to a negative charging network. . The composite filter of the present invention may be formed of a combination of the above preferable resin materials.

【０００９】本発明に用いられる弗素系樹脂は、樹脂中
に弗素原子が好ましくは２５重量％以上、より好ましく
は５０重量％以上含まれていることが望ましい。弗素系
樹脂の好適な例としては、弗化ビニル、弗化ビニリデン
等の二弗化エチレン、三弗化エチレン、四弗化エチレ
ン、三弗化塩化エチレン或いは六弗化プロピレンなどの
単独重合体或いは、これらの単量体どうしまたは他の単
量体との共重合体である。The fluorine-based resin used in the present invention preferably contains fluorine atoms in the resin in an amount of preferably 25% by weight or more, more preferably 50% by weight or more. Preferable examples of the fluorine-based resin include vinyl fluoride, vinylidene fluoride, etc., difluoroethylene, trifluoroethylene, tetrafluoroethylene, trifluorochloroethylene, propylene hexafluoride, etc. , A copolymer of these monomers or with other monomers.

【００１０】本発明の好ましい例では、正帯電網を構成
する繊維が上記樹脂Ｂ（負に帯電し易い材料）を芯材と
して、その表面に樹脂Ａ（正に帯電し易い材料）が形成
されている２重構造となっている。このような２重構造
の正帯電網を採用することによって、水洗後の電位回復
と共に除塵効率に優れた複合フィルタを形成することが
できる。また、好ましい負帯電網の繊維構造は、逆の２
重構造すなわち樹脂Ａを芯材としてその表面に樹脂Ｂが
形成されたものである。正負の帯電網を共に上記２重構
造とすることによって、複合フィルタの性能をさらに向
上することができる。特に好ましい２重構造の表面樹脂
は、正帯電網に対してはシリコン樹脂、負帯電網に対し
ては弗素系樹脂である。In a preferred example of the present invention, the fibers constituting the positively charged net have the resin B (material that is easily negatively charged) as a core material, and the resin A (material that is easily positively charged) is formed on the surface thereof. It has a double structure. By adopting such a double-structured positive charging net, it is possible to form a composite filter having excellent dust removal efficiency as well as potential recovery after washing with water. Also, the preferred negatively charged net has a reverse fiber structure of 2
It has a heavy structure, that is, resin A as a core material and resin B is formed on the surface thereof. The performance of the composite filter can be further improved by making the positive and negative charging nets both have the double structure. Particularly preferable double-sided surface resin is a silicone resin for the positive charging network and a fluorine-based resin for the negative charging network.

【００１１】上述の２重構造繊維は、２種類の糸を撚糸
する際に芯部と表層部とに分ける方法、共押出により芯
鞘構造の繊維とする方法などによっても製造できるが、
簡便でありより好ましい方法は、浸漬法、スプレー法、
塗布法などにより、基材繊維の表面に被覆膜を形成する
ことである。樹脂被覆量の目安としては、１ｍ² の網当
たり５〜５０ｇ、好ましくは１０〜２５ｇである。The above-mentioned double-structured fiber can be produced by a method of splitting two kinds of yarns into a core portion and a surface layer portion, a method of forming a core-sheath structure fiber by coextrusion, and the like.
A simple and more preferable method is a dipping method, a spray method,
A coating film is formed on the surface of the base fiber by a coating method or the like. As a measure of the resin coating amount, it is 5 to 50 g, preferably 10 to 25 g per 1 m ² net.

【００１２】樹脂コーテイングの実際例を例示すれば、
四弗化エチレン樹脂の場合には、四弗化エチレン樹脂コ
ート材（例えば、ニューＴＦＥコート・ＦＣ−１０２、
ファインケミカルジャパン製）を用いてスプレー法で、
シリコン樹脂の場合には、１液性室温硬化シリコンゴム
（脱酢酸型）を溶媒に溶かして浸漬法で、ウレタン樹脂
の場合には、２液性ウレタン樹脂（例えば、クインネー
ト、日本ゼオン製）を溶媒に溶かして浸漬法で、弗素系
樹脂の場合には、例えば弗化ビニリデン／三弗化エチレ
ン（７５／２５モル比）共重合体（呉羽化学工業製）を
溶媒に溶かして浸漬法で、それぞれの樹脂皮膜を基材表
面に形成することができる。To give a practical example of resin coating,
In the case of a tetrafluoroethylene resin, a tetrafluoroethylene resin coating material (for example, New TFE coat FC-102,
Fine chemical Japan) using the spray method,
In the case of silicone resin, a one-liquid room temperature curing silicone rubber (deacetic acid type) is dissolved in a solvent to be immersed, and in the case of urethane resin, a two-liquid urethane resin (for example, Quinnate, manufactured by Zeon Corporation) is used. Dissolve in a solvent and dip it. In the case of a fluorine-based resin, for example, vinylidene fluoride / ethylene trifluoride (75/25 molar ratio) copolymer (Kureha Chemical Industry Co., Ltd.) is dissolved in a solvent and dip Each resin film can be formed on the surface of the base material.

【００１３】本発明の複合フィルタでは、網は荷電され
ている。荷電された網を得る方法として、網にコロナ放
電処理を施す方法がある。コロナ放電処理は平板電極の
上に網を載せ、針電極を放電電極としてコロナ放電させ
て行う。コロナ放電処理は加熱しながら行うことが好ま
しく、網が軟化、変形を起こさない程度の温度、例えば
９０〜１００℃程度の温度で行う。コロナ放電処理時間
としては、３〜５分程度を一つの例として挙げることが
できる。正に荷電された網を得るには、電源の陽極を放
電電極に、負に荷電された網を得るには、電源の陰極を
放電電極にそれぞれ接続する。In the composite filter of the present invention, the net is charged. As a method of obtaining a charged net, there is a method of subjecting the net to corona discharge treatment. The corona discharge treatment is carried out by placing a mesh on the flat plate electrode and using the needle electrode as the discharge electrode for corona discharge. The corona discharge treatment is preferably performed while heating, and is performed at a temperature at which the net does not soften or deform, for example, at a temperature of about 90 to 100 ° C. The corona discharge treatment time can be, for example, about 3 to 5 minutes. To obtain a positively charged net, the anode of the power supply is connected to the discharge electrode, and to obtain a negatively charged net, the cathode of the power supply is connected to the discharge electrode.

【００１４】本発明複合フィルタのそれぞれの網に予め
コロナ放電などによる荷電処理を施しておくことは好ま
しいことであるが、本発明はかかる処理を必ずしも必要
としない。なぜならば、上述の好ましい網の組合せにお
いては、網を互いに接触するように積層しておくことに
より網が特に強く自己荷電され、帯電フィルタとして十
分使用に供し得るからである。It is preferable that each mesh of the composite filter of the present invention is charged in advance by corona discharge or the like, but the present invention does not necessarily require such processing. This is because, in the above preferable combination of nets, the nets are particularly strongly self-charged by stacking the nets so that they are in contact with each other, and can be sufficiently used as a charging filter.

【００１５】本発明の複合フィルタは二枚以上の網を重
ねてなるものであるが、一方の極性に帯電された網（内
層網と称す）の両面に、他方の極性に帯電された網（外
層網と称す）を積層した三枚の網からなっていてもよ
く、更にこのような網を四枚以上用いてもよく、この場
合、隣接する網表面の帯電極性が互いに異なるように重
ね合わせるとよい。複合フィルタを構成するそれぞれの
網、例えば図１に示すような複合フィルタ５の内層網１
及び外層網２、３は周囲に設けられた枠体４により一体
化されるか、または網の周囲を相互に溶着若しくは貼着
されて一体化される。また図２に示すように両外層網
２、３間に内層網１を挟んで配置し、交換のため内層網
１を両外層網２、３間から取り出せるように、両外層網
２、３の周囲を部分的に枠体４に固定して一体化しても
よい。なお、平織の網とハニカム状に織った網とを適宜
選択して積層してもよい。三枚の網で複合フィルタを形
成する場合、洗浄等の容易性から大部分の塵埃が両外層
の網で吸着されるようにするのがよく、この観点からは
正帯電網で両外層を形成するのがよい。The composite filter of the present invention is formed by stacking two or more nets, and a net charged to one polarity (referred to as an inner layer net) is formed on both sides of the net charged to the other polarity ( It may be composed of three nets in which outer nets are laminated), and four or more such nets may be used. In this case, they are superposed so that the charging polarities of the adjacent net surfaces are different from each other. Good. Each network that constitutes the composite filter, for example, the inner layer network 1 of the composite filter 5 as shown in FIG.
The outer layer nets 2 and 3 are integrated by a frame body 4 provided around them, or they are integrated by being welded or attached to each other around the nets. As shown in FIG. 2, the inner layer network 1 is arranged between the outer layer networks 2 and 3 so that the inner layer network 1 can be taken out from between the outer layer networks 2 and 3 for exchange. The periphery may be partially fixed to the frame body 4 to be integrated. A plain woven net and a honeycomb woven net may be appropriately selected and laminated. When forming a composite filter with three nets, it is better to allow most of the dust to be adsorbed by the nets on both outer layers for ease of cleaning, etc. Good to do.

【００１６】本発明の複合フィルタは、電子、精密、薬
品若しくは食品工業等のエアーフィルタ、インテリジェ
ントビル、工場若しくは事務所等の空気清浄機、さらに
は手術、歯科医、衛生士、花粉症若しくは産業用等のマ
スクに好ましく用いることができる。The composite filter of the present invention is an air filter for electronic, precision, chemical or food industries, an air cleaner for intelligent buildings, factories or offices, and also for surgery, dentists, hygienists, hay fever or industry. It can be preferably used as a mask for medical use.

【００１７】[0017]

【作用】本発明にかかる複合フィルタでは、網が少なく
とも二枚重ねられて、この二枚の網のそれぞれの少なく
とも表面が帯電列においてプラス側とマイナス側に分か
れた材料からなっており、一方の網の表面が正極に、他
方の網の表面が負極にそれぞれ荷電されている。このよ
うな構成により、それぞれの網の電位減衰、変動を小さ
くすることができ、また水洗、乾燥後の電位復元も大き
くすることができる。そして、電位減衰が小さく電位復
元が大きい網を具備した本発明複合フィルタでは、大き
な静電力によって塵埃を効果的に吸着することができ
る。In the composite filter according to the present invention, at least two nets are superposed, and at least the surface of each of the two nets is made of a material which is divided into the plus side and the minus side in the electrification row. The surface is charged to the positive electrode, and the surface of the other net is charged to the negative electrode. With such a configuration, it is possible to reduce the potential attenuation and fluctuation of each net, and also to increase the potential restoration after washing and drying. Further, in the composite filter of the present invention, which is equipped with a net having a small potential attenuation and a large potential restoration, dust can be effectively adsorbed by a large electrostatic force.

【００１８】[0018]

【実施例】以下、実施例及び比較例により、本発明を具
体的に説明する。なお、本発明はこれらの実施例に限定
されるものではない。試験に供した合成樹脂製の網 実施例および比較例で用いた合成樹脂製の網の性状を表
１に示す。ここで、ＰＥＴ網は、太さ０．１５ｍｍφの
ポリエステル単繊維を径糸および緯糸としてハニカム状
に織った網であり、その目付けは８５ｇ／ｍ² 、厚み
（山と谷の間の距離）は１．４〜１．７ｍｍであった。
また、ＰＰ網は、太さ０．２３ｍｍφのポリプロピレン
単繊維を径糸および緯糸としてハニカム状に織った網で
あり、その目付けは９１ｇ／ｍ² 、厚みは１．０〜１．
５ｍｍであった。EXAMPLES The present invention will be specifically described below with reference to Examples and Comparative Examples. The present invention is not limited to these examples. Table 1 shows the properties of the synthetic resin nets used in the examples and comparative examples of the synthetic resin nets used in the test . Here, the PET net is a net in which a polyester single fiber having a thickness of 0.15 mmφ is woven in a honeycomb form as a diameter yarn and a weft yarn, and its basis weight is 85 g / m ² and the thickness (distance between peaks and valleys) is It was 1.4 to 1.7 mm.
The PP net is a net in which polypropylene single fibers having a thickness of 0.23 mmφ are woven in a honeycomb shape as a diameter yarn and a weft yarn, and its basis weight is 91 g / m ² and the thickness is 1.0 to 1.
It was 5 mm.

【００１９】樹脂被覆 表１の網に、適宜、弗素系樹脂またはシリコン樹脂の被
膜を施した。弗素系樹脂の被膜は、弗化ビニリデン／三
弗化エチレン（７５／２５モル比）共重合体（呉羽化学
工業製）をメチルエチルケトン溶媒中で４重量％の溶液
濃度となるように溶解した液中に網を浸漬し、引き上げ
て室温で１６時間乾燥した後、９０℃の温度で５時間硬
化させて行なった。樹脂の被覆量は、１０〜１５ｇ／ｍ
² の範囲であった。後述の表２〜４には、当該弗素系樹
脂を被覆された網は、略号”Ｆ”で表されている。ま
た、シリコン樹脂の被膜は、コーテイング用シリコン樹
脂（ＴＳＥ３９９、東芝シリコーン製）をｎ−ヘキサン
溶媒中で１．５重量％の溶液濃度となるように溶解した
液中に網を浸漬し、引き上げて室温で６時間乾燥した
後、６０℃の温度で２時間硬化させて行なった。樹脂の
被覆量は、１０〜１５ｇ／ｍ² の範囲であった。後述の
表２〜４には、当該シリコン樹脂を被覆された網は、略
号”Ｓ”で表されている。 Resin Coating The net of Table 1 was appropriately coated with a fluorine resin or a silicone resin. The coating film of the fluorine-based resin is a solution prepared by dissolving a vinylidene fluoride / ethylene trifluoride (75/25 molar ratio) copolymer (manufactured by Kureha Chemical Industry Co., Ltd.) in a methyl ethyl ketone solvent to a solution concentration of 4% by weight. A net was dipped in, pulled up, dried at room temperature for 16 hours, and then cured at a temperature of 90 ° C. for 5 hours. Resin coverage is 10-15g / m
It was in the range of ² . In Tables 2 to 4 described later, the nets coated with the fluorine-based resin are represented by the abbreviation "F". The silicone resin coating is obtained by immersing a net in a liquid obtained by dissolving a coating silicone resin (TSE399, manufactured by Toshiba Silicone) in an n-hexane solvent to a solution concentration of 1.5% by weight and pulling it up. It was dried at room temperature for 6 hours and then cured at a temperature of 60 ° C. for 2 hours. The resin coverage was in the range of 10 to 15 g / m ² . In Tables 2 to 4 described later, the net covered with the silicone resin is represented by the abbreviation "S".

【００２０】[0020]

【表１】 [Table 1]

【００２１】荷電処理 表１の網および樹脂被覆された網に、適宜、コロナ放電
による荷電処理を施した。まず、平板電極の上に網を載
せ、その上方に５ｍｍの間隔で配列した針状電極（電極
間距離１０ｍｍ）との間でコロナ放電を発生させた。荷
電処理の条件は、温度９５℃、放電時間３分であり、両
電極間には６〜１０ＫＶの直流電圧を印加した。荷電処
理を行なった網は、次の性能試験までの間の電位減衰を
最小限に抑えるため、速やかにアルミニウム箔で密閉し
て保存した。なお、網に正電荷を荷電させるときには、
電極の極性は針状電極が正極となるように、逆に網に負
電荷を荷電させるときには、針状電極が負極となるよう
に切り換えた。後述の表２〜４には、正電荷の荷電処理
を施された網は略号”＋”で、負電荷の荷電処理を施さ
れた網は略号”−”で表されている。以上のようにし
て、表１の網およびそれに樹脂被覆を施した網、更には
それらに正電荷または負電荷を荷電させた網を準備し、
性能試験の試験網とした。 Charging Treatment The net of Table 1 and the net covered with resin were appropriately subjected to a charging treatment by corona discharge. First, a net was placed on the flat plate electrode, and corona discharge was generated between the net and the needle electrodes (interelectrode distance 10 mm) arranged at intervals of 5 mm. The conditions of the charging treatment were a temperature of 95 ° C. and a discharge time of 3 minutes, and a DC voltage of 6 to 10 KV was applied between both electrodes. The charged net was quickly sealed with aluminum foil and stored to minimize potential decay until the next performance test. When charging the net with a positive charge,
The polarity of the electrode was switched so that the needle electrode would be the positive electrode, and conversely, when the net was charged with negative charges, the needle electrode would be the negative electrode. In Tables 2 to 4 to be described later, nets subjected to the positive charge charging process are represented by the abbreviation "+", and nets subjected to the negative charge charging process are represented by the abbreviation "-". As described above, the net of Table 1 and the net coated with the resin, and the net in which the positive charge or the negative charge is charged are prepared,
It was used as a test network for performance tests.

【００２２】性能試験（１） 次のようにして、網の表面電位の変化を調べる試験を実
施した。まず、上記試験網単独またはそれらの組合わせ
を選び出し、その表面電位を測定し、図１に示す枠体に
収納して室内に吊り下げ放置した。試験網の大きさはす
べて２０ｃｍ×２０ｃｍであり、荷電処理されている網
についてはアルミニウム箔を剥がし、試験に供した。ま
た、試験網の組合せを選んだ場合には、網どうしが互い
に接触するように積層して枠体に収納した（図１）。続
いて、定期的に網を枠体から外し、それぞれについて表
面電位を測定して再び枠体に戻す操作を繰り返した。網
の表面電位は、表面電位計ＳＴＡＴＩＲＯＮ ＴＹＰＥ
−ＴＨ（宍戸商会製）を用いて測定した。なお、試験の
途中（表２の試験では８日目の電位測定後、表３および
４の試験では３日目の電位測定後）で試験網に水洗処理
を施した。これは、水洗後の電位の回復力を見るための
ものであり、枠ごと水中に約５分間浸漬し、引き上げて
試験を続行した。性能試験（２） 次のようにして、フィルタ性能を調べる試験を実施し
た。空気清浄機・エアヘルス（松下電器産業製）の既設
の不織布フィルタを取り外し、代わりに同寸法（１６ｃ
ｍ×１６ｃｍ）に裁断した試験網を取り付け、和室で清
浄機を１時間運転した後、網の表面を顕微鏡で観察し
た。また、清浄機の吐出側ダクトに風速計を設置し、フ
ィルタ交換に伴う風量変化を調べた。以下の実施例およ
び比較例における性能試験（１）の結果をまとめて表２
〜４に示す。該表で網の構成の説明には、上記略号が用
いられている。なお、ＦともＳとも記述のないものは、
樹脂被覆のない素材そのままの網であること、また＋と
も−とも記述のないものは、荷電処理を施してない網で
あることを示す。 Performance test (1) A test for investigating changes in the surface potential of the net was conducted as follows. First, the test nets alone or a combination thereof were selected, the surface potential thereof was measured, and the test nets were housed in the frame shown in FIG. All the test nets had a size of 20 cm × 20 cm, and the charged nets were peeled off from the aluminum foil and used for the test. When the combination of the test nets was selected, the nets were stacked so that the nets were in contact with each other and housed in the frame (FIG. 1). Then, the operation of periodically removing the net from the frame, measuring the surface potential of each, and returning the net to the frame again was repeated. The surface potential of the net is the surface potential meter STATIRON TYPE
-TH (made by Shishido Shokai) was used for measurement. In the middle of the test (after the potential measurement on the 8th day in the test of Table 2 and after the potential measurement on the 3rd day in the test of Tables 3 and 4), the test net was washed with water. This was to see the recovery potential of the potential after washing with water, and the whole frame was immersed in water for about 5 minutes and pulled up to continue the test. Performance test (2) A test for investigating the filter performance was carried out as follows. Remove the existing non-woven fabric filter from Air Purifier / Air Health (Matsushita Electric Industrial Co., Ltd.) and replace it with the same size (16c
A test net cut into (m × 16 cm) was attached, and the purifier was operated for 1 hour in a Japanese-style room, and then the surface of the net was observed with a microscope. In addition, an anemometer was installed in the discharge side duct of the purifier, and the change in air volume due to filter replacement was investigated. The results of the performance test (1) in the following examples and comparative examples are summarized in Table 2.
~ 4. In the table, the above abbreviations are used to describe the network configuration. If there is no description of F or S,
A net with no resin coating as it is, or a net without a description of + or-indicates that the net is not charged.

【００２３】実施例１ ＰＥＴ網を弗素系樹脂で被覆し、負電荷を荷電させた網
（内層網）の両側に、ＰＥＴ網をシリコン樹脂で被覆
し、正電荷を荷電させた網（外層網）を配して積層した
３層構造の複合フィルタを形成し試験した。なお、用い
られた内層網および外層網の表面電位は、それぞれ単独
では１乃至３日で初期値の１／１０程度までに減衰し、
フィルタとして単独使用に耐え得るものではなかった。
また、本実施例の性能試験（２）の結果では、上流側
（空気の吸い込み側）の外層網に多量の繊維状の埃や細
かい粉塵の付着が見られ、さらに下流側の外層網にも相
対的に少ない量であるが、埃や粉塵の付着が観察され
た。しかし、内層網にはほとんど埃や粉塵の付着はなか
った。また、風量は既設の不織布フィルタよりも約２．
５倍多く、圧損がそれだけ少ないことを示した。Example 1 A PET net was coated with a fluorine-based resin, and a PET net was coated with a silicone resin on both sides of a net charged with a negative charge (inner layer net), and a net charged with a positive charge (outer layer net). ) Was placed and laminated to form a composite filter having a three-layer structure and tested. In addition, the surface potentials of the inner layer network and the outer layer network used are individually attenuated to about 1/10 of the initial value in 1 to 3 days,
It could not stand alone as a filter.
Further, in the result of the performance test (2) of this example, a large amount of fibrous dust or fine dust was found to be attached to the outer layer network on the upstream side (air suction side), and further on the outer layer network on the downstream side. Adhesion of dust and dust was observed, although the amount was relatively small. However, almost no dust or dust adhered to the inner layer network. In addition, the air volume is about 2.
It was shown to be 5 times more and the pressure loss less.

【００２４】実施例２ ＰＥＴ網をシリコン樹脂で被覆し、正電荷を荷電させた
網（内層網）の両側に、ＰＥＴ網を弗素系樹脂で被覆
し、負電荷を荷電させた網（外層網）を配して積層した
実施例１とは逆の層構成の複合フィルタを形成し試験し
た。本例の性能試験（２）では、内層網には多量の繊維
状の埃や細かい粉塵の付着が見られたが、両外層網には
ほとんど埃や粉塵の付着はなかった。Example 2 A PET net was coated with a silicone resin, and a positive net was charged on both sides of the net (inner layer net), and a PET net was coated with a fluororesin, and a net was charged with a negative charge (outer net). ) Was placed and laminated to form a composite filter having a layer structure opposite to that of Example 1 and tested. In the performance test (2) of this example, a large amount of fibrous dust or fine dust was found to be attached to the inner layer net, but almost no dust or dust was attached to both outer layer nets.

【００２５】比較例１ 内層網および両外層網とも、ＰＥＴ網を弗素系樹脂で被
覆し、負電荷を荷電させた網を用いて複合フィルタを構
成し試験した。本比較例の性能試験（２）では、いずれ
の網にもほとんど埃や粉塵の付着はなかった。このフィ
ルタ性能試験の結果は、性能試験（１）において電位減
衰の大きい本例に対する実施例１，２の電位減衰のない
結果と良い相関を示している。Comparative Example 1 For both the inner layer network and both outer layer networks, PET networks were coated with a fluororesin, and a composite filter was constructed by using nets charged with negative charges and tested. In the performance test (2) of this comparative example, almost no dust or dust adhered to any net. The result of the filter performance test shows a good correlation with the result of the performance test (1) in which the potential attenuation is large and the results of Examples 1 and 2 without potential attenuation.

【００２６】実施例３ 両外層網として荷電処理を施さず、弗素系樹脂を被覆し
ただけのＰＥＴ網を用いた以外は、実施例１と同様な複
合フィルタを形成し試験した。実施例１と比較して、水
洗前の電位レベルはほぼ半分程度であるが、水洗後は変
わりなかった。Example 3 A composite filter similar to that of Example 1 was formed and tested, except that the outer nets were not subjected to a charging treatment and a PET net that was merely coated with a fluororesin was used. Compared with Example 1, the potential level before washing with water was about half, but it did not change after washing with water.

【００２７】実施例４ 両外層網に樹脂被膜も荷電処理も施していないＰＥＴ網
自体を用いた以外は、実施例３と同様な複合フィルタを
形成し試験した。実施例３と比較すると、電位変化も水
洗後の電位回復も幾分劣る結果が得られた。Example 4 A composite filter similar to that of Example 3 was formed and tested, except that the PET net itself which was not subjected to resin coating or charging treatment was used for both outer layer nets. Compared with Example 3, the result was that the potential change and the potential recovery after washing with water were somewhat inferior.

【００２８】比較例２ 樹脂被膜を行なわず、ＰＥＴ網自体を負に荷電させた網
（内層網）の両側に、正電荷を荷電させたＰＥＴ網（外
層網）を配して積層した３層構造の複合フィルタを形成
し試験した。電位減衰が激しく、水洗後の電位の回復も
ほとんどなかった。Comparative Example 2 A three-layer structure in which a PET network (outer layer network) charged with a positive charge is arranged on both sides of a network (inner layer network) in which the PET network itself is negatively charged without forming a resin coating. A composite filter of the structure was formed and tested. The potential was severely attenuated, and the potential was hardly recovered after washing with water.

【００２９】比較例３ ＰＥＴ網を弗素系樹脂で被覆し、負電荷を荷電させた網
（内層網）の両側に、ＳＵＳ網を配して３層構造の複合
フィルタを形成し試験した。本例は、金属箔内に収容さ
れた帯電網の電位の減衰が少ないことにヒントを得て実
施されたが、金網（フィルタ用途で用いるには多孔体で
あることが必要条件である）では効果がないことを示し
ている。Comparative Example 3 A PET filter was coated with a fluorine-based resin, and a SUS net was placed on both sides of a net (inner net) charged with negative charges to form a composite filter having a three-layer structure and tested. This example was carried out with the hint that the potential of the charging net contained in the metal foil was little attenuated, but in the case of wire mesh (a porous material is a necessary condition for use in filter applications). It has no effect.

【００３０】実施例５ ＰＥＴ網を弗素系樹脂で被覆し、負電荷を荷電させた網
（内層網）と、ＰＥＴ網をシリコン樹脂で被覆し、正電
荷を帯電させた網（外層網）とを積層した複合フィルタ
を形成し試験した。本実施例と実施例１の層構成には、
２層（本例）と３層の違いがあり、その影響で本例は幾
分水洗後の電位回復が劣る結果であった。Example 5 A net in which a PET net was coated with a fluorine-based resin and charged with a negative charge (inner layer net), and a net in which a PET net was covered with a silicone resin and charged with a positive charge (outer layer net) Was formed and tested. The layer configurations of this example and Example 1 are:
There was a difference between the two layers (this example) and the three layers, and due to this difference, the potential recovery after washing with water was somewhat inferior in this example.

【００３１】実施例６ ＰＥＴ網の代わりにＮｙ網を用いた以外は、実施例４と
同様な複合フィルタを形成し試験した。実施例４と比較
すると、電位変化も水洗後の電位回復も幾分優れる結果
が得られた。一方、本例のＮｙ網に代えてＰＥ網やＰＰ
網を両外層網として配した複合フィルタは、本例や実施
例４と比べて電位変化は遜色なかったが、水洗後の電位
回復はほとんど期待できないものであった。Example 6 A composite filter similar to that of Example 4 was formed and tested, except that the Ny net was used instead of the PET net. Compared with Example 4, the result was that the potential change and the potential recovery after washing with water were somewhat excellent. On the other hand, instead of the Ny network of this example, a PE network or PP
The potential difference of the composite filter in which the nets were arranged as both outer layer networks was comparable to those of this example and Example 4, but the potential recovery after washing with water was hardly expected.

【００３２】実施例７ Ｎｙ網の代わりにシリコン樹脂被膜Ｎｙ網を用いた以外
は、実施例６と同様な複合フィルタを形成し試験した。
外層網へのシリコン樹脂被覆により、水洗後の電位回復
が前例より大幅に改善する結果となった。Example 7 A composite filter similar to that of Example 6 was formed and tested, except that the Ny net was replaced by a silicone resin coated Ny net.
By coating the outer network with silicone resin, the potential recovery after water washing was significantly improved compared to the previous case.

【００３３】実施例８，９ ＰＥＴ網を弗素系樹脂で被覆し、負電荷を帯電させた網
（内層網）の両側に、シリコン樹脂被覆を施したＰＥ網
（外層網、帯電処理は施されていない）を配して積層し
た３層構造の複合フィルタを形成し試験した。水洗い処
理を行なっても、まったく電荷減衰のない優れた複合フ
ィルタの組み合わせが得られた。一方、本例のシリコン
樹脂被覆ＰＥ網に代えてシリコン樹脂被覆Ｎｙ網やポリ
塩化ビニール網（平織、１６メッシュ）を両外層網とし
て配した複合フィルタでも、本例と比べて水洗後の電位
回復に若干劣る程度で、ほとんど遜色ない結果であっ
た。Examples 8 and 9 PET nets were coated with a fluorine-based resin, and negatively charged nets (inner nets) were coated on both sides with PE nets coated with silicone resin (outer nets and charged). No.) was arranged and laminated to form a composite filter having a three-layer structure. Even after washing with water, an excellent combination of composite filters with no charge decay was obtained. On the other hand, even with a composite filter in which a silicone resin-coated Ny mesh or a polyvinyl chloride mesh (plain weave, 16 mesh) is used as both outer layer networks instead of the silicone resin-coated PE mesh of this example, the potential recovery after washing with water is greater than that of this example. The result was slightly inferior to the above, and was almost comparable.

【００３４】実施例１０ 弗素系樹脂被覆ＰＥＴ網（内層網）の両側に、シリコン
樹脂被覆ＰＰ網（外層網）を配して積層した３層構造の
複合フィルタを形成し試験した。本例の内外層網のいず
れも荷電処理は施されていないが、網どうしが互いに接
触するように積層して枠体に収容して室内に吊り下げ放
置しておくだけで、驚くべきことに著しい帯電が見られ
た。そして、この自己荷電後の電位変化は、他の実施例
と比べて遜色ないものであった。Example 10 A composite filter having a three-layer structure in which a silicone resin-coated PP network (outer layer network) was laminated on both sides of a fluorine-based resin-coated PET network (inner layer network) was formed and tested. Although neither the inner nor outer layer network of this example has been subjected to charging treatment, it is surprising that the nets are stacked so that the nets come into contact with each other, housed in a frame body, and hung in the room and left alone. Significant electrification was observed. The change in potential after self-charging was comparable to the other examples.

【００３５】実施例１１ ＰＰ網を弗素系樹脂で被覆し、負電荷を荷電させた網
（内層網）の両側に，ＰＰ網をシリコン樹脂で被覆し、
正電荷を帯電させた網（外層網）を配して積層した３層
構造の複合フィルタを形成し試験した。このケースもま
た、水洗処理による電荷減衰のない優れた複合フィルタ
の組み合わせであった。Example 11 A PP network was coated with a fluorine-based resin, and a PP network was coated with a silicone resin on both sides of a network (inner layer network) charged with negative charges.
A composite filter having a three-layer structure in which a net (outer layer net) charged with positive charges was arranged and laminated was tested. Again, this case was an excellent combination of composite filters with no charge decay due to washing treatment.

【００３６】[0036]

【表２】 [Table 2]

【００３７】[0037]

【表３】 [Table 3]

【００３８】[0038]

【表４】 [Table 4]

【００３９】上述の実施態様に基づけば、本発明の複合
フィルタは、少なくとも表面材質が異なる網の積層体で
あること、好ましい例では水洗後に電位の回復が見られ
ることが理解できる。また、実施例１〜１１も含めて、
特に好ましい複合フィルタを示せば、初期値を除いて正
帯電網（正電荷を帯びている網）の電位が常に２ＫＶ以
上であるケースである。なお、実施例８〜１１の正帯電
網は、負に帯電され易い基材の表面を正に帯電され易い
樹脂で被覆した２重構造であることを付記する。Based on the above-mentioned embodiment, it can be understood that the composite filter of the present invention is a laminate of nets having at least different surface materials, and in a preferred example, the potential recovery is observed after washing with water. In addition, including Examples 1 to 11,
If a particularly preferable composite filter is shown, the potential of the positively charged net (positively charged net) is always 2 KV or more except for the initial value. Note that the positive charging nets of Examples 8 to 11 have a double structure in which the surface of the base material that is easily negatively charged is coated with the resin that is easily positively charged.

【００４０】[0040]

【発明の効果】以上のように本発明によれば、高湿度の
雰囲気で用いてもまた水洗しても帯電量の減衰が少な
く、したがって塵埃の捕集効率が安定して高く、しかも
不織布などに比べて通気抵抗と繊維の飛散の点でも有利
な荷電された網状複合フィルタを提供することができ
る。As described above, according to the present invention, even when used in a high-humidity atmosphere or washed with water, the charge amount is less attenuated, and therefore the dust collection efficiency is stable and high, and a non-woven fabric or the like is used. It is possible to provide a charged reticulated composite filter which is more advantageous in terms of ventilation resistance and fiber scattering than the above.

【図面の簡単な説明】[Brief description of drawings]

【図１】本発明の好ましい実施例の断面説明図である。FIG. 1 is a cross-sectional explanatory view of a preferred embodiment of the present invention.

【図２】本発明の好ましい他の実施例の断面説明図であ
る。FIG. 2 is a sectional explanatory view of another preferred embodiment of the present invention.

【符号の説明】[Explanation of symbols]

１ 内層網 ２、３ 外層網 ４ 枠体 ５ 複合フィルタ 1 Inner layer network 2, 3 Outer layer network 4 Frame 5 Composite filter

Claims (4)

【特許請求の範囲】[Claims] 【請求項１】 負の極性に帯電している負帯電網と、正
の極性に帯電しており該負帯電網とは表面材質が帯電列
においてプラス側に位置する正帯電網とが交互に少なく
とも２層以上、かつ網どうしが互いに接触するように積
層されていることを特徴とする複合フィルタ。1. A negative charging net having a negative polarity and a negative charging net having a positive polarity are alternately charged with a positive charging net whose surface material is located on the positive side in the charging train. A composite filter having at least two layers and being laminated so that meshes are in contact with each other. 【請求項２】 正帯電網を構成する繊維が、弗素系樹
脂、ポリプロピレン系樹脂およびポリエチレン系樹脂の
いずれかからなる芯材の表面に、シリコン樹脂、ポリア
ミド系樹脂、ポリエステル系樹脂およびウレタン系樹脂
のいずれかからなる表面樹脂層が形成されている２重構
造となっている請求項１に記載の複合フィルタ。2. A silicon resin, a polyamide resin, a polyester resin, and a urethane resin are formed on the surface of a core material in which the fibers constituting the positive charging net are made of any one of a fluorine resin, a polypropylene resin and a polyethylene resin. The composite filter according to claim 1, which has a double structure in which a surface resin layer made of any one of the above is formed. 【請求項３】 正帯電網の表面材質がシリコン樹脂、ポ
リアミド系樹脂、ポリエステル系樹脂およびウレタン系
樹脂のいずれかであり、負帯電網の表面材質が弗素系樹
脂、ポリプロピレン系樹脂およびポリエチレン系樹脂の
いずれかである請求項１または２に記載の複合フィル
タ。3. The surface material of the positive charging net is any of silicon resin, polyamide resin, polyester resin and urethane resin, and the surface material of the negative charging net is fluorine resin, polypropylene resin and polyethylene resin. The composite filter according to claim 1 or 2, wherein the composite filter is any one of 1. 【請求項４】 一方の極性に帯電している帯電網の両面
に、他方の極性に帯電している帯電網を配して３層構造
となっている請求項１乃至３のいずれかに記載の複合フ
ィルタ。4. The three-layer structure according to claim 1, wherein a charging net charged to the other polarity is arranged on both sides of the charging net charged to one polarity to form a three-layer structure. Composite filter.