JPH07256026A - Filter medium for air filter - Google Patents
Filter medium for air filterInfo
- Publication number
- JPH07256026A JPH07256026A JP7795994A JP7795994A JPH07256026A JP H07256026 A JPH07256026 A JP H07256026A JP 7795994 A JP7795994 A JP 7795994A JP 7795994 A JP7795994 A JP 7795994A JP H07256026 A JPH07256026 A JP H07256026A
- Authority
- JP
- Japan
- Prior art keywords
- nonwoven fabric
- melt
- filter
- fibers
- filter medium
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Filtering Materials (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はメルトブロー不織布を用
いたエアフィルタ用濾材に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter material for an air filter using a melt blown nonwoven fabric.
【０００２】[0002]
【従来の技術】従来、空気清浄装置やマスクなどには空
気中の微細な塵埃を捕集するエアフィルタ用濾材として
メルトブロー不織布が使用されている。メルトブロー不
織布は繊維径０．５〜５０μｍの微細な繊維からなる緻
密な構造を有するため、１μｍ以下の微小な粒子を高い
捕集効率で捕集できる優れた濾材である。とくに、この
メルトブロー不織布を、例えば高圧電極と接地電極間で
コロナ放電処理することなどにより、エレクトレット化
処理したものは、その静電気的な捕集効果と相まって非
常に優れた捕集能力を示す。2. Description of the Related Art Conventionally, melt blown non-woven fabrics have been used as filter media for air filters for collecting fine dust in the air in air cleaners, masks and the like. Since the melt blown nonwoven fabric has a dense structure composed of fine fibers having a fiber diameter of 0.5 to 50 μm, it is an excellent filter medium that can collect fine particles of 1 μm or less with high collection efficiency. In particular, the melt-blown nonwoven fabric that has been electretized by, for example, corona discharge treatment between the high-voltage electrode and the ground electrode exhibits a very excellent trapping ability in combination with its electrostatic trapping effect.
【０００３】しかしながら、従来のメルトブロー不織布
からなるフィルタ用濾材は、気体流入側表面が比較的フ
ラットな構造からなるため、塵埃の保持容量が小さく、
使用寿命が短いという欠点があった。この欠点を解決す
るために、低密度の濾材を積層して密度勾配を持たせる
ことなどが試みられたが、微細な塵埃はメルトブロー不
織布の表面で集中的に捕集されて目詰りが生じるため、
使用寿命を十分に長くすることはできなかった。However, the conventional filter media made of melt-blown non-woven fabric has a relatively flat surface on the gas inflow side, and therefore has a small dust holding capacity,
It had the drawback of a short service life. In order to solve this drawback, it was attempted to stack low density filter media to have a density gradient, but fine dust was intensively collected on the surface of the meltblown nonwoven fabric, causing clogging. ,
The service life could not be extended sufficiently.
【０００４】[0004]
【発明が解決しようとする課題】本発明は従来のメルト
ブロー不織布からなるエアフィルタ用濾材の欠点を解消
するべくなされたものであり、高い捕集効率を有すると
共に、塵埃の保持容量が大きく、使用寿命が長いエアフ
ィルタ用濾材を提供することを課題とする。SUMMARY OF THE INVENTION The present invention has been made to solve the drawbacks of the conventional filter media for air filters made of melt-blown non-woven fabric, and has a high trapping efficiency and a large dust holding capacity. An object is to provide a filter material for an air filter having a long life.
【０００５】[0005]
【課題を解決するための手段】上記の課題を解決するた
めに、請求項１に記載の発明は、「平均繊維径０．５〜
５０μｍの繊維から構成され、気体流入側表面に凹凸差
が０．１〜１．０ｍｍの凹凸が形成されており、該凹部
と凸部における構造が実質的に均質であるメルトブロー
不織布からなることを特徴とするエアフィルタ用濾
材。」をその要旨とする。In order to solve the above-mentioned problems, the invention described in claim 1 has an average fiber diameter of 0.5 to
The melt-blown non-woven fabric is composed of 50 μm fibers and has irregularities with an irregularity difference of 0.1 to 1.0 mm on the gas inflow side surface, and the structure of the concave and convex portions is substantially uniform. A characteristic filter material for air filters. Is the gist.
【０００６】また、請求項２に記載の発明は「メルトブ
ロー不織布がエレクトレット化されていることを特徴と
する請求項１に記載のエアフィルタ用濾材。」を要旨と
する。The invention according to claim 2 has as its gist the "filter material for an air filter according to claim 1, characterized in that the meltblown nonwoven fabric is electretized."
【０００７】また、請求項３に記載の発明は、「平均繊
維径０．５〜５０μｍの繊維から構成され、気体流入側
表面に凹凸差が０．１〜１．０ｍｍの凹凸が形成されて
おり、該凹部と凸部における構造が実質的に均質である
メルトブロー不織布と、該メルトブロー不織布の上流側
に配置された該メルトブロー不織布よりも初期圧力損失
の小さい支持用濾材とが、部分的に結合されることによ
り、層間に空間を内包して積層されていることを特徴と
するエアフィルタ用濾材。」を要旨とする。Further, the invention according to claim 3 is that "the fibers having an average fiber diameter of 0.5 to 50 .mu.m are formed, and unevenness of 0.1 to 1.0 mm is formed on the gas inflow side surface. The melt-blown non-woven fabric having a substantially uniform structure in the concave and convex portions and the supporting filter medium having an initial pressure loss smaller than that of the melt-blown non-woven fabric arranged upstream of the melt-blown non-woven fabric are partially bonded. As a result, the filter material for an air filter is characterized in that it is laminated with a space included between the layers. "
【０００８】また、請求項４に記載の発明は、「プリー
ツ加工が施されていることを特徴とする請求項３に記載
のエアフィルタ用濾材。」を要旨とする。The invention according to claim 4 is summarized as "a filter medium for an air filter according to claim 3, which is pleated."
【０００９】[0009]
【作用】請求項１に記載のエアフィルタ用濾材にあって
は、メルトブロー不織布の気体流入側表面に凹凸差が
０．１〜１．０ｍｍの凹凸が形成されているため、塵埃
はメルトブロー不織布の厚み方向に分布して捕集される
ので、保持容量が増大し、使用寿命も延びる。また、凹
凸を形成する際に加圧成形などで凹部を緻密化すること
により形成しておらず、該凹部と凸部における構造が実
質的に均質であるため、通気抵抗（初期圧力損失）が増
大したり、塵埃が偏って捕集されたりすることがなく、
メルトブロー不織布の優れた捕集能力が維持されてい
る。In the filter material for an air filter according to claim 1, since the unevenness of the unevenness of 0.1 to 1.0 mm is formed on the surface of the melt blown nonwoven fabric on the gas inflow side, dust is generated from the meltblown nonwoven fabric. Since it is distributed and collected in the thickness direction, the holding capacity increases and the service life extends. Further, when forming the unevenness, the concave portion is not formed by densifying the concave portion by pressure molding or the like, and since the structure of the concave portion and the convex portion is substantially uniform, the ventilation resistance (initial pressure loss) is reduced. It does not increase or dust is unevenly collected,
The excellent collection ability of the meltblown nonwoven fabric is maintained.
【００１０】また、請求項２に記載のエアフィルタ用濾
材にあっては、メルトブロー不織布がエレクトレット化
されているため、エレクトレット化による静電気的な捕
集効果と相まって高い捕集効率で微細な塵埃が捕集でき
る。Further, in the filter material for an air filter according to the second aspect, since the melt-blown non-woven fabric is electretized, fine dust is collected with a high trapping efficiency in combination with the electrostatic trapping effect due to electretization. Can be collected.
【００１１】また、請求項３に記載のエアフィルタ用濾
材にあっては、気体流入側表面に凹凸差が０．１〜１．
０ｍｍの凹凸が形成されているメルトブロー不織布と、
該メルトブロー不織布の上流側に配置された該メルトブ
ロー不織布よりも初期圧力損失の小さい支持用濾材と
が、部分的に結合されることにより、層間に空間を内包
して積層されているため、該空間に塵埃を保持すること
ができ、塵埃の保持容量が大きくなる。また、支持用濾
材と積層することでプリーツ加工などの加工が行いやす
くなり、加工後の保形性もよくなる。Further, in the filter material for an air filter according to the third aspect, the unevenness of the surface of the gas inflow side is 0.1 to 1.
A melt-blown non-woven fabric having 0 mm unevenness,
Since the supporting filter medium having an initial pressure loss smaller than that of the melt-blown nonwoven fabric, which is arranged on the upstream side of the melt-blown nonwoven fabric, is partially bonded to form a space between layers, the space is laminated. The dust can be held in the interior, and the dust holding capacity is increased. Further, by laminating it with the supporting filter medium, processing such as pleating is facilitated and the shape retention after processing is improved.
【００１２】また、請求項４に記載のエアフィルタ用濾
材にあっては、プリーツ加工によって濾過に働く濾材の
表面積を大きくできる。Further, in the filter medium for an air filter according to the fourth aspect, the surface area of the filter medium acting for filtration can be increased by pleating.
【００１３】本発明のエアフィルタ用濾材はメルトブロ
ー法により製造される平均繊維径０．５〜５０μｍ、好
ましくは平均繊維径１〜１０μｍ、とくに好ましくは平
均繊維径１〜５μｍの微細な繊維が集積されたメルトブ
ロー不織布からなる。一般に、メルトブロー法では溶融
した樹脂をノズルから押出し、押出された樹脂をノズル
近傍から吹き出す高速の気体流により細化し、これをコ
ンベヤなどの搬送体上に集積してメルトブロー不織布を
形成する。本発明では、樹脂の溶融紡糸温度、気体流の
速度、ノズルから集積面までの距離などを調節すること
により、繊維が繊維形態を保てるが形状の変形が可能な
状態で搬送体上に集積し、搬送体として５〜３０メッシ
ュ、より好ましくは１０〜２０メッシュのネットを用い
ることで、ネットの空間にあたる部分にメルトブロー不
織布を突出させてメルトブロー不織布の表面に凹凸を形
成する。例えば、ポリプロピレン樹脂を用いる場合であ
れば、紡糸温度３００〜３７０℃、気体流の速度（吐出
風量）４〜１０Ｎｍ3 ／分、ノズルから集積面までの距
離（集積距離）３０〜５５ｃｍの条件でメルトブロー
し、これを５〜３０メッシュのネットに集積することで
表面に所望の凹凸を有するメルトブロー不織布が得られ
る。図１は本発明のメルトブロー不織布１からなるエア
フィルタ用濾材の平面図で、表面に凸部２と凹部３とが
形成されている。なお、隣り合う凸部の頂点と凸部の頂
点との距離は１〜６ｍｍ、より好ましくは２〜５ｍｍの
範囲にあることが望ましく、これより狭いと凸部間に形
成される空間が狭くなるため、十分な塵埃保持容量が得
られなくなったり、凸部どうしが接触して通気抵抗が大
きくなったりすることがあり、これより広くなると実質
的に平面部分が大きくなり、凹凸を設けることによる効
果が薄れてしまう。The filter material for an air filter of the present invention is a collection of fine fibers having an average fiber diameter of 0.5 to 50 μm, preferably an average fiber diameter of 1 to 10 μm, particularly preferably an average fiber diameter of 1 to 5 μm, produced by a melt blow method. Made of melt-blown nonwoven fabric. Generally, in the melt-blowing method, molten resin is extruded from a nozzle, the extruded resin is thinned by a high-speed gas flow blown out from the vicinity of the nozzle, and this is accumulated on a carrier such as a conveyor to form a melt-blown nonwoven fabric. In the present invention, by adjusting the melt spinning temperature of the resin, the velocity of the gas flow, the distance from the nozzle to the collecting surface, etc., the fibers can be accumulated on the carrier in a state where the fiber form can be maintained but the shape can be deformed. By using a net of 5 to 30 mesh, and more preferably 10 to 20 mesh as a carrier, the melt blown nonwoven fabric is made to protrude in a portion corresponding to the space of the net to form irregularities on the surface of the melt blown nonwoven fabric. For example, in the case of using polypropylene resin, the spinning temperature is 300 to 370 ° C., the gas flow velocity (discharge air volume) is 4 to 10 Nm 3 / min, and the distance from the nozzle to the collecting surface (collecting distance) is 30 to 55 cm. By melt-blowing and accumulating this on a net of 5 to 30 mesh, a melt-blown nonwoven fabric having desired irregularities on the surface can be obtained. FIG. 1 is a plan view of a filter material for an air filter, which is composed of the meltblown nonwoven fabric 1 of the present invention, in which a convex portion 2 and a concave portion 3 are formed on the surface. The distance between the vertices of adjacent convex portions is preferably 1 to 6 mm, more preferably 2 to 5 mm. If the distance is smaller than this, the space formed between the convex portions becomes narrow. Therefore, it may not be possible to obtain a sufficient dust holding capacity, or the convex portions may come into contact with each other to increase the ventilation resistance, and if it is wider than this, the substantially planar portion becomes large, and the effect of providing unevenness is Will fade.
【００１４】本発明のエアフィルタ用濾材の気体流入側
表面には、上記の凹凸が凹凸差０．１〜１．０ｍｍとな
るように形成されている。凹凸差が０．１ｍｍ未満では
十分な塵埃の保持容量の向上が望めず、１．０ｍｍを超
えると構造圧損により圧力損失が大きくなりやすく、と
くにプリーツ加工したときに、その傾向が大となり、ま
た大きく繊維形状を変形させる必要があることから繊維
形態自体が崩れてフィルム化しやすくなり、通気抵抗が
増大する。より好ましいエアフィルタ用濾材の気体流入
側表面の凹凸差は０．１〜０．５ｍｍ、とくに好ましく
は０．２〜０．４ｍｍである。なお、凹凸差は凸部の頂
点を繋ぐ線分で不織布を切断し、その断面を顕微鏡写真
で撮影し、図２の部分拡大断面模型図に示すように、２
つの隣り合う凸部の頂点ＡＢを繋いだ線分とこれと平行
で２つの凸部間にある凹部の底点Ｃを通る線分との距離
ｄから求められる。On the gas inflow side surface of the filter material for an air filter of the present invention, the above-mentioned irregularities are formed so that the irregularity difference is 0.1 to 1.0 mm. If the unevenness difference is less than 0.1 mm, it is not possible to expect a sufficient improvement in the dust holding capacity, and if it exceeds 1.0 mm, the pressure loss tends to increase due to the structural pressure loss, especially when pleating, and this tendency becomes large. Since it is necessary to greatly deform the fiber shape, the fiber form itself collapses, and it becomes easy to form a film, and the ventilation resistance increases. The unevenness of the gas inflow side surface of the filter material for an air filter is more preferably 0.1 to 0.5 mm, and particularly preferably 0.2 to 0.4 mm. In addition, the unevenness is obtained by cutting the non-woven fabric along a line segment that connects the vertices of the protrusions, and taking a cross-section of the cross-section with a micrograph, as shown in the partially enlarged cross-sectional model view of FIG.
It is obtained from the distance d between a line segment connecting the vertices AB of two adjacent convex portions and a line segment parallel to this and passing through the bottom point C of the concave portion between the two convex portions.
【００１５】本発明のエアフィルタ用濾材を構成するメ
ルトブロー不織布１は凹部２と凸部３における構造が実
質的に均質となっている。ここで、構造が実質的に均質
とは、構成繊維の繊維径や断面形状が凹部２と凸部３で
差がなく、構成繊維の密度や分布にも大きな差がないこ
とを言う。現実のメルトブロー不織布では搬送体となる
ネットを構成する線条体の上に集積された繊維と、空間
部分に集積された繊維とでは、繊維の受ける力が異なる
ため、多少の繊維形状、密度、分布などに差が出る可能
性があるが、この程度の差は実質的に均質という概念に
含まれるものとする。従来から不織布の表面に凹凸を形
成する手段としては、エンボスロールなどにより加熱加
圧することにより、不織布表面に圧縮された凹部を設け
る手段がある。しかし、このような手段では、凹部の繊
維密度が著しく高くなったり、場合によってはフィルム
化するため、通気抵抗が増大する。また、メルトブロー
不織布内の密度分布が局所的に不均一となるため、塵埃
が偏って捕集され、部分的に目詰りが起き、所望の捕集
効率が得られなくなったり、使用寿命が短くなることが
ある。本発明では前述した製造方法のように、繊維が繊
維形態を保て、かつ形状の変形が可能な状態でネットな
どの搬送体上に集積して、メルトブロー不織布の表面に
凹凸を形成しているので、不織布は凹部において著しい
圧縮を受けておらず、凹部と凸部における構造が実質的
に均質になっている。なお、図２のようにメルトブロー
不織布の厚みも凹部２と凸部３で同じかまたは比較的近
い厚みとなっていることが望ましい。In the melt blown nonwoven fabric 1 constituting the filter material for an air filter of the present invention, the structures of the concave portions 2 and the convex portions 3 are substantially uniform. Here, that the structure is substantially homogeneous means that there is no difference in the fiber diameter or cross-sectional shape of the constituent fibers between the concave portions 2 and the convex portions 3, and there is no great difference in the density or distribution of the constituent fibers. In the actual melt blown non-woven fabric, the fibers accumulated on the filaments forming the net to be the carrier and the fibers accumulated in the space have different forces on the fibers. Although there may be differences in distribution, etc., such differences are included in the concept of being substantially homogeneous. Conventionally, as a means for forming irregularities on the surface of a nonwoven fabric, there is a means for providing a compressed recess on the surface of the nonwoven fabric by heating and pressing with an embossing roll or the like. However, with such a means, the fiber density of the recesses becomes extremely high, and in some cases a film is formed, so that the ventilation resistance increases. In addition, since the density distribution in the meltblown nonwoven fabric is locally non-uniform, dust is unevenly collected and partially clogged, the desired collection efficiency cannot be obtained, and the service life is shortened. Sometimes. In the present invention, as in the manufacturing method described above, fibers are accumulated on a carrier such as a net while maintaining the fiber form and capable of deforming the shape to form irregularities on the surface of the meltblown nonwoven fabric. Therefore, the nonwoven fabric is not subjected to significant compression in the recesses, and the structures in the recesses and the protrusions are substantially homogeneous. In addition, as shown in FIG. 2, it is desirable that the thickness of the melt blown nonwoven fabric is the same or relatively close in the concave portion 2 and the convex portion 3.
【００１６】メルトブロー不織布１を製造するための樹
脂としては、溶融紡糸により繊維形成が可能な樹脂が用
いられ、例えば、ポリエチレン樹脂、ポリプロピレン樹
脂、ポリメチルペンテン樹脂、ポリカーボネート樹脂、
ポリエステル樹脂、ポリアミド樹脂などが単独または複
合して使用される。とくに、後述するエレクトレット化
処理を施す場合には、ポリエチレン樹脂、ポリプロピレ
ン樹脂、ポリメチルペンテン樹脂などのポリオレフィン
系樹脂がエレクトレット化しやすいのでよい。また、エ
アフィルタ用濾材として用いるために、メルトブロー不
織布１の目付は５０〜１５０ｇ／ｍ2 、見かけ密度は
０．０５〜０．３ｇ／ｃｍ3 の範囲にあることが望まし
い。As the resin for producing the melt blown nonwoven fabric 1, a resin capable of forming fibers by melt spinning is used, and examples thereof include polyethylene resin, polypropylene resin, polymethylpentene resin, polycarbonate resin,
Polyester resin, polyamide resin and the like are used alone or in combination. In particular, when the electretization treatment described below is performed, a polyolefin resin such as a polyethylene resin, a polypropylene resin, or a polymethylpentene resin may be easily electretized. Further, for use as a filter material for an air filter, it is desirable that the melt blown nonwoven fabric 1 has a basis weight of 50 to 150 g / m 2 and an apparent density of 0.05 to 0.3 g / cm 3 .
【００１７】本発明のエアフィルタ用濾材に用いられる
メルトブロー不織布１はエレクトレット化されているこ
とが望ましい。エレクトレット化の方法としては、例え
ば、メルトブロー法によりノズルから押出された直後の
繊維の流れに電荷粒子を衝突させてエレクトレット化す
る方法（特公昭５９−１２４号）や、メルトブロー不織
布を接地電極上に置き、これと対向する非接触の高圧電
極との間で高電圧を印加することでエレクトレット化す
る方法（特開昭６０−１６８５１１号、特開昭６１−１
０２４７６号など）などの公知の方法を用いることがで
きる。エレクトレット化されたメルトブロー不織布は、
静電気的に塵埃を吸着して捕集する作用を有するため、
メルトブロー不織布の繊維構造では捕集が困難なより微
小な塵埃粒子の捕集も可能となる。The melt blown nonwoven fabric 1 used in the filter material for an air filter of the present invention is preferably electretized. Examples of the electretization method include a method in which charge particles are collided with a flow of fibers immediately after being extruded from a nozzle by a meltblowing method to electretize (Japanese Patent Publication No. 59-124) or a meltblown nonwoven fabric is placed on a ground electrode. Then, a method for producing an electret by applying a high voltage between the non-contact high-voltage electrode and the non-contact high-voltage electrode (see JP-A-60-168511 and JP-A-61-1).
Known methods such as No. 02476) can be used. The electretized melt blown nonwoven fabric is
Since it has a function of electrostatically adsorbing and collecting dust,
Finer dust particles, which are difficult to collect with the fiber structure of the meltblown nonwoven fabric, can be collected.
【００１８】本発明のエアフィルタ用濾材は、前述した
気体流入側表面に凹凸を設けたメルトブロー不織布１の
みからなるものであってもよいが、このメルトブロー不
織布１の上流側にメルトブロー不織布よりも初期圧力損
失の小さい支持用濾材４を配置し、両者を部分的に結合
することにより、層間に空間を内包するように積層した
ものであってもよい。ここで、メルトブロー不織布１に
ついては先に説明済みなので説明を省略する。The filter material for an air filter according to the present invention may be composed only of the melt-blown nonwoven fabric 1 having the above-mentioned surface on the gas inflow side with irregularities. Alternatively, the supporting filter medium 4 having a small pressure loss may be arranged and partially bonded to each other so that the layers are laminated so as to include a space between layers. Here, since the melt blown nonwoven fabric 1 has been already described, the description thereof will be omitted.
【００１９】支持用濾材４としては、公知の不織布、織
物、編み物、紙、ネットなどからなる濾材の内、使用す
るメルトブロー不織布よりも初期圧力損失（通気抵抗）
が小さいものが使用される。メルトブロー不織布は高速
高温の気体流で細化された微細な繊維から構成されるた
め、微小な塵埃の捕集に優れているが、反面構成繊維の
単繊維強度が小さく保形性に劣る。このため、例えばメ
ルトブロー不織布に直接プリーツ加工を施しても、プリ
ーツ形状は安定に保持されず、風圧などが加わると容易
に変形してしまう。支持用濾材はメルトブロー不織布に
形状安定性を与えるために使用され、例えばプリーツ加
工後の形状を保持することにより、濾過に作用するメル
トブロー不織布の表面積を大きく保つことで、捕集効率
を高め、濾材の使用寿命を延ばすことができる。支持用
濾材４としては、プレフィルタとしても効果的に働く不
織布を用いることが望ましく、その中でも水流絡合不織
布を用いるとよい。水流絡合不織布は繊維どうしの高度
な絡合によって不織布が形成されており、強度に優れ、
しかも実質的に接着剤が使用されていないため繊維間の
空隙が封鎖されることがないので初期圧力損失も小さ
い。また、水流絡合不織布は繊維油剤などの繊維助剤が
製造工程中に洗い流されてわずかしか付着していないの
でエレクトレット化が行いやすいという利点もある。As the supporting filter material 4, among the known filter materials made of non-woven fabric, woven fabric, knitted fabric, paper, net, etc., the initial pressure loss (breathing resistance) is lower than that of the melt-blown non-woven fabric used.
The smaller one is used. Since the meltblown nonwoven fabric is composed of fine fibers thinned by a high-speed and high-temperature gas flow, it is excellent in collecting fine dust, but on the other hand, the single fiber strength of the constituent fibers is small and the shape retention is poor. Therefore, for example, even if the melt-blown nonwoven fabric is directly pleated, the pleated shape is not stably maintained and is easily deformed when wind pressure or the like is applied. The supporting filter medium is used for imparting shape stability to the meltblown nonwoven fabric. For example, by maintaining the shape after pleating, the surface area of the meltblown nonwoven fabric that acts on filtration is kept large, thereby increasing the collection efficiency and increasing the filter medium. The service life of can be extended. As the supporting filter material 4, it is desirable to use a non-woven fabric that also works effectively as a pre-filter, and among them, a hydroentangled non-woven fabric is preferably used. Hydro-entangled non-woven fabric is formed by a high degree of entanglement of fibers and has excellent strength,
Moreover, since the adhesive is not substantially used, the voids between the fibers are not blocked, and the initial pressure loss is small. In addition, the hydroentangled nonwoven fabric has an advantage that it can be easily electretized because a fiber auxiliary agent such as a fiber oil agent is washed off during the manufacturing process and is attached only slightly.
【００２０】支持用濾材４として使用する水流絡合不織
布としては、ポリエチレン繊維、ポリプロピレン繊維、
ポリエステル繊維、ポリアミド繊維などの繊維を単独ま
たは組合せて形成した繊維ウェブに、水流絡合法により
高圧水流を作用させて繊維を絡合させた不織布が使用さ
れ、その目付は２０〜１５０ｇ／ｍ2 、見かけ密度は
０．０１〜０．２ｇ／ｃｍ3 の範囲にあることが望まし
い。As the hydroentangled nonwoven fabric used as the supporting filter medium 4, polyethylene fibers, polypropylene fibers,
A non-woven fabric in which fibers are entangled by applying a high-pressure water flow by a hydroentangling method to a fiber web formed by using fibers such as polyester fibers and polyamide fibers alone or in combination, and the basis weight is 20 to 150 g / m 2 , The apparent density is preferably in the range of 0.01 to 0.2 g / cm 3 .
【００２１】前記メルトブロー不織布１と支持用濾材４
とは、熱接着、超音波接着、高周波接着、バインダー接
着などの公知の結合方法によって部分的に結合される。
部分的に結合するのは、結合面積が大きくなればなるほ
ど通気性が阻害されるからであり、結合部５はメルトブ
ロー不織布と支持用濾材との積層状態が取り扱い時や加
工時に保てる範囲でできるだけ少ない方がよい。結合部
５は濾材全体に渡って施されていることが望ましく、例
えば、点、線、円、三角形、四角形、多角形の所定の形
状の結合部が、所定の間隔と配置で多数分布した構造と
なっているのがよい。図３には結合部５の一例が示され
ており、線状の結合部が六角形が縦横に連続した模様と
なるように配置されている。The melt blown nonwoven fabric 1 and the supporting filter medium 4
And are partially bonded by a known bonding method such as heat bonding, ultrasonic bonding, high frequency bonding, or binder bonding.
The reason for partial bonding is that the larger the bonding area is, the more the air permeability is impaired, and the bonding portion 5 is as small as possible in the range where the laminated state of the meltblown nonwoven fabric and the supporting filter medium can be maintained during handling or processing. Better. It is desirable that the joint portions 5 are provided over the entire filter medium. For example, a structure in which a large number of joint portions having a predetermined shape such as dots, lines, circles, triangles, quadrangles, and polygons are distributed at predetermined intervals and arrangements. Is good. FIG. 3 shows an example of the connecting portion 5, in which the linear connecting portions are arranged so that the hexagons are continuous vertically and horizontally.
【００２２】前記メルトブロー不織布１と支持用濾材４
とは、共にエレクトレット化されていてもよく、いずれ
か一方がエレクトレット化されていてもよい。とくに、
支持用濾材として水流絡合不織布を使用し、水流絡合不
織布と前記メルトブロー不織布１の両方をエレクトレッ
ト化したものからなるエアフィルタ用濾材は、低い通気
抵抗で高い捕集効率が得られ、しかも塵埃の保持容量も
大きいのでよい。なお、前記メルトブロー不織布１と支
持用濾材４の少なくとも一方がエレクトレット化されて
いる場合、結合方法としては超音波接着によるのがよ
い。これは、熱接着などの場合、結合部分の周辺にも熱
が伝播してエレクトレットが消滅することがあるからで
ある。The melt blown nonwoven fabric 1 and the supporting filter medium 4
And may both be electretized, or one of them may be electretized. Especially,
A filter medium for an air filter, which comprises a hydroentangled non-woven fabric as a supporting filter medium and is an electret of both the hydro-entangled non-woven fabric and the melt-blown non-woven fabric 1, has a low airflow resistance and a high collection efficiency, and is dusty. It is good because it also has a large storage capacity. When at least one of the melt-blown nonwoven fabric 1 and the supporting filter medium 4 is electretized, ultrasonic bonding is preferable as a bonding method. This is because in the case of heat bonding or the like, heat may propagate to the periphery of the joint portion and the electret may disappear.
【００２３】部分的に結合された前記メルトブロー不織
布１と支持用濾材４とは、図４に示すように、メルトブ
ロー不織布１の凹凸表面と支持用濾材４との間に形成さ
れる空間６を内包した状態で積層される。このため、支
持用濾材４を通過してきた微小な塵埃はメルトブロー不
織布の内部で捕集されるだけでなく、この空間部分にも
捕集され、結果として塵埃の保持容量が増大する。とく
に、支持用濾材４が存在することで塵埃が再移動しにく
いため塵埃は確実に濾材内に保持される。As shown in FIG. 4, the partially bonded meltblown nonwoven fabric 1 and the supporting filter medium 4 include a space 6 formed between the uneven surface of the meltblown nonwoven fabric 1 and the supporting filter medium 4. It is laminated in the state. Therefore, the fine dust that has passed through the supporting filter medium 4 is not only collected inside the melt blown nonwoven fabric but also in this space portion, and as a result, the dust holding capacity is increased. In particular, the presence of the supporting filter medium 4 makes it difficult for the dust to move again, so that the dust is reliably held in the filter medium.
【００２４】前記の気体流入側表面に凹凸が形成されて
いるメルトブロー不織布１と、メルトブロー不織布１よ
りも初期圧力損失が小さく、上流側に配置された支持用
濾材４とを部分的に結合することにより、層間に空間６
を内包した状態で積層した本発明のエアフィルタ用濾材
には、プリーツ加工が施されていることが望ましい。こ
のエアフィルタ用濾材は支持用濾材４と積層されている
ため、プリーツ加工が容易に行え、加工後のプリーツ形
状の安定性にも優れている。また、プリーツ加工された
濾材は濾過作用をする濾材の表面積が増大しているの
で、通気抵抗が小さく、塵埃の保持能力が更に高くなっ
ている。例えば空気清浄機などに用いる濾材の場合、プ
リーツのピッチは３〜１０ｍｍ、より好ましくは３．５
〜６．５ｍｍ、プリーツの高さは１０〜７０ｍｍ、より
好ましくは１０〜６０ｍｍとなっていることが望まし
い。Partially bonding the melt blown nonwoven fabric 1 having irregularities formed on the gas inflow side surface and the supporting filter medium 4 having an initial pressure loss smaller than that of the melt blown nonwoven fabric 1 and arranged upstream. Space 6 between layers
It is desirable that the filter material for an air filter of the present invention, which is laminated in a state of including the above, is pleated. Since this air filter medium is laminated with the supporting filter medium 4, it can be easily pleated and the pleated shape after the process is stable. Further, the pleated filter medium has an increased surface area of the filter medium acting as a filter, so that it has a small air flow resistance and a higher dust holding capability. For example, in the case of a filter medium used in an air cleaner, the pleats have a pitch of 3 to 10 mm, more preferably 3.5.
It is desirable that the pleats have a height of 10 to 70 mm, more preferably 10 to 60 mm.
【００２５】[0025]
実施例１ ＭＩ（メルトインデックス）＝６５のポリプロピレン樹
脂をメルトブロー法により、ノズルから樹脂吐出量６５
０ｃｃ／分／オリフィス、紡糸温度３３０℃の条件で押
出し、ノズル近傍から吹き出す吐出風量６Ｎｍ3 ／分、
温度３０℃の空気流により細化して、１０メッシュのス
テンレス製ネット上に集積し、表面に凹凸を有する目付
７８ｇ／ｍ2 、見かけ密度０．１ｇ／ｃｍ3 のメルトブ
ロー不織布を得た。このメルトブロー不織布を表面の凸
部を繋ぐ線分で切断し、その断面の顕微鏡写真（倍率２
５倍）から凹凸差を５点で測定して平均を求めたところ
０．２８ｍｍであった。なお、凹凸差は隣合う凸部の頂
点を結んだ線分と、その線分と平行で凸部間にある凹部
の底点を通る線分との距離を測定して求めた。なお、こ
のメルトブロー不織布の断面は、図２に示す模型図のよ
うな構造となっており、繊維の形状や繊維径は凹部と凸
部で差がなく、繊維の分布や密度も外観上大きな差が認
められず、凹部と凸部では均質な構造となっていた。一
方、ポリプロピレン繊維からなる繊維ウェブに水圧１０
０ｋｇ／ｃｍ2 の条件で水流絡合処理を施して目付５０
ｇ／ｍ2 、見かけ密度０．０８ｇ／ｃｍ3 の水流絡合不
織布を得た。なお、この水流絡合不織布の初期圧力損失
は０．２ｍｍＡｑで、上記メルトブロー不織布の０．３
ｍｍＡｑよりも小さかった。上記メルトブロー不織布と
水流絡合不織布とに各々エレクトレット化処理を施して
エレクトレット化した。エレクトレット化処理の方法と
しては、ロール形状の接地電極に接触状態で搬送しなが
ら、対向する非接触のワイヤ電極との間で１４〜１５Ｋ
Ｖの直流高電圧をかけることにより行った。なお、ワイ
ヤー電極と接地電極との距離は１０〜３０ｍｍ、接地時
間は３秒以上とし、不織布の搬送速度（テンポ）は１０
〜３０ｍ／分とした。上記メルトブロー不織布の凹凸差
０．２８ｍｍの凹凸を有する表面側の上に、上記水流絡
合不織布を積層し、図４に示すように線状の結合部が六
角形が連続する模様状に配置されるように、メルトブロ
ー不織布側から超音波接着してエアフィルタ用濾材を得
た。Example 1 A polypropylene resin having MI (melt index) = 65 was ejected from a nozzle by a melt-blowing method at a resin ejection amount of 65.
0 cc / min / orifice, extrusion temperature of 330 ° C., extruded air from the vicinity of the nozzle, and a discharge air volume of 6 Nm 3 / min,
The melt-blown non-woven fabric having a weight of 78 g / m 2 and an apparent density of 0.1 g / cm 3 having irregularities on the surface was obtained by thinning with an air flow at a temperature of 30 ° C. and accumulating on a 10-mesh stainless net. This meltblown non-woven fabric was cut along a line segment connecting the convex portions on the surface, and a micrograph of the cross section (magnification: 2
(5 times), the unevenness difference was measured at 5 points and the average was found to be 0.28 mm. The unevenness difference was obtained by measuring the distance between a line segment connecting the vertices of adjacent convex portions and a line segment parallel to the line segment and passing through the bottom points of the concave portions between the convex portions. The cross section of this meltblown nonwoven fabric has a structure as shown in the model diagram of Fig. 2, and there is no difference in the shape and diameter of the fibers between the concave and convex portions, and the distribution and density of the fibers also differ greatly in appearance. Was not observed, and the concave and convex portions had a homogeneous structure. On the other hand, a water pressure of 10 is applied to the fiber web made of polypropylene fibers.
A hydro-entanglement treatment is applied under the condition of 0 kg / cm 2 and the basis weight is 50.
A hydroentangled nonwoven fabric having a g / m 2 and an apparent density of 0.08 g / cm 3 was obtained. The initial pressure loss of this hydroentangled non-woven fabric was 0.2 mmAq, which was 0.3 mm of that of the above melt-blown non-woven fabric.
It was smaller than mmAq. The meltblown nonwoven fabric and the hydroentangled nonwoven fabric were each electretized by electretizing treatment. The electretization method is carried out in a state of being in contact with a ground electrode in the form of a roll, and is 14 to 15 K between the opposing non-contact wire electrode
It was carried out by applying a DC high voltage of V. In addition, the distance between the wire electrode and the ground electrode is 10 to 30 mm, the ground time is 3 seconds or more, and the transfer speed (tempo) of the nonwoven fabric is 10
-30 m / min. The hydroentangled non-woven fabric is laminated on the surface side of the melt-blown non-woven fabric having the concavo-convex difference of 0.28 mm, and linear connecting portions are arranged in a pattern in which hexagons are continuous as shown in FIG. As described above, ultrasonic bonding was performed from the meltblown nonwoven fabric side to obtain a filter material for an air filter.
【００２６】得られたエアフィルタ用濾材の初期圧力損
失と、粒子捕集率と、粉じん保持容量とを求めて表１に
示した。なお、初期圧力損失はＪＩＳ−Ｂ−９９０８の
８．１．２圧力損失試験に準じて、風速１０ｃｍ／秒の
条件で測定した。粒子捕集率はＪＩＳ−Ｂ−９９０８の
８．１．１粒子捕集率試験に準じて、風速１０ｃｍ／
秒、塵埃粒子０．３〜０．５μｍの条件で測定した。粉
じん保持容量はＪＩＳ−Ｂ−９９０８の８．２．３粉じ
ん保持容量試験に準じて、風速６ｃｍ／秒の条件で、最
終圧力損失が８ｍｍＡｑとなるまでに保持される塵埃の
重量を測定した。The initial pressure loss, the particle collection rate, and the dust retention capacity of the obtained filter material for an air filter were determined and shown in Table 1. The initial pressure loss was measured according to the 8.1.2 pressure loss test of JIS-B-9908 under the condition of a wind speed of 10 cm / sec. The particle collection rate is in accordance with JIS-B-9908, 8.1.1 Particle collection rate test, and the wind speed is 10 cm /
Second, measurement was performed under the condition of dust particles of 0.3 to 0.5 μm. For the dust retention capacity, the weight of the dust retained until the final pressure loss reached 8 mmAq was measured under the condition of the wind speed of 6 cm / sec according to the 8.2.3 dust retention capacity test of JIS-B-9908.
【００２７】次いで、このエアフィルタ用濾材をピッチ
６．５ｍｍ、高さ２０ｍｍの条件でレシプロ方式でプリ
ーツ加工し、フィルタ枠に収納してフィルタユニットを
形成した。得られたフィルタユニットの初期圧力損失
と、粒子捕集率と、ライフとを求めて表２に示した。な
お、初期圧力損失はＪＩＳ−Ｂ−９９０８の８．１．２
圧力損失試験に準じて、風速２ｍ／秒の条件で測定し
た。粒子捕集率はＪＩＳ−Ｂ−９９０８の８．３．１粒
子捕集率試験に準じて、風速１ｍ／秒、塵埃粒子０．３
〜０．５μｍの条件で測定した。ライフは、粉じん保持
容量をＪＩＳ−Ｂ−９９０８の８．２．３粉じん保持容
量試験に準じて、風速１ｍ／秒の条件で、最終圧力損失
が８ｍｍＡｑとなるまでに保持される塵埃の重量により
測定し、処理風量と試験に用いた塵埃濃度から次式によ
って求めた。Next, the filter material for the air filter was pleated by a reciprocating method under the conditions of a pitch of 6.5 mm and a height of 20 mm and housed in a filter frame to form a filter unit. The initial pressure loss, particle collection rate, and life of the obtained filter unit were determined and shown in Table 2. The initial pressure loss is 8.1.2 of JIS-B-9908.
According to the pressure loss test, the measurement was performed under the condition of a wind speed of 2 m / sec. The particle collection rate is in accordance with JIS-B-9908 8.3.1 particle collection rate test, wind speed 1 m / sec, dust particles 0.3.
The measurement was performed under the condition of 0.5 μm. Life is based on the weight of dust retained until the final pressure loss reaches 8 mmAq under the condition of wind speed of 1 m / sec, according to the dust retention capacity test of JIS-B-9908 8.2.3. It was measured and determined from the treated air volume and the dust concentration used in the test by the following formula.
【００２８】[0028]
【式１】 [Formula 1]
【００２９】比較例１ ＭＩ（メルトインデックス）＝６５のポリプロピレン樹
脂をメルトブロー法により、ノズルから樹脂吐出量６５
０ｃｃ／分／オリフィス、紡糸温度３４０℃の条件で押
出し、ノズル近傍から吹き出す吐出風量４３０Ｎｍ3 ／
分、温度２５℃の空気流により細化して、パンチメタル
上に集積し、目付７９ｇ／ｍ2 、見かけ密度０．１６ｇ
／ｃｍ3 の従来のメルトブロー不織布を得た。このメル
トブロー不織布を切断し、その断面の顕微鏡写真（倍率
２５倍）から凹凸差を５点で測定して平均を求めたとこ
ろ０．０３７ｍｍとほとんど凹凸は見られなかった。メ
ルトブロー不織布として平均の凹凸差が０．０３７ｍｍ
のものを用いたこと以外は、実施例１と同様にして水流
絡合不織布と超音波接着により結合され、エレクトレッ
ト化されたエアフィルタ用濾材を作製した。得られたエ
アフィルタ用濾材の初期圧力損失と、粒子捕集率と、粉
じん保持容量とを実施例１と同様にして求めて表１に示
した。次いで、このエアフィルタ用濾材を用いて、実施
例１と同様にしてフィルタユニットを作製し、得られた
フィルタユニットの初期圧力損失と、粒子捕集率と、ラ
イフとを求めて表２に示した。Comparative Example 1 A polypropylene resin having MI (melt index) = 65 was ejected from a nozzle by a melt blow method to a resin ejection amount of 65.
Extrusion amount of 430 Nm 3 / extruded under the conditions of 0 cc / min / orifice and spinning temperature of 340 ° C.
Min., Thinned by an air flow at a temperature of 25 ° C and accumulated on a punch metal, with a basis weight of 79 g / m 2 and an apparent density of 0.16 g.
A conventional meltblown non-woven fabric of / cm 3 was obtained. This meltblown nonwoven fabric was cut, and the unevenness difference was measured at 5 points from a micrograph (magnification of 25 times) of the cross section, and the average was obtained, which was 0.037 mm, and almost no unevenness was observed. Average unevenness of 0.037 mm as a melt blown nonwoven fabric
In the same manner as in Example 1 except that the above-mentioned one was used, the hydroentangled nonwoven fabric was bonded by ultrasonic bonding to prepare an electret filter medium for an air filter. The initial pressure loss, the particle collection rate, and the dust holding capacity of the obtained air filter medium were determined in the same manner as in Example 1 and shown in Table 1. Then, using this filter medium for air filters, a filter unit was produced in the same manner as in Example 1, and the initial pressure loss, particle collection rate, and life of the obtained filter unit were determined and shown in Table 2. It was
【００３０】[0030]
【表１】 [Table 1]
【００３１】[0031]
【表２】 表１及び表２からは、気体流入側表面に凹凸差が０．２
８ｍｍの凹凸が形成されているメルトブロー不織布を用
いた実施例１のエアフィルタ用濾材が、凹凸差がほとん
どないメルトブロー不織布を使用した比較例１のエアフ
ィルタ用濾材と比べて、初期圧力損失、捕集効率の点で
は遜色がないにもかかわらず、２倍を超える塵埃保持容
量を有し、それを用いて作製したフィルタユニットのラ
イフも２．５倍となっており、使用寿命の大幅なアップ
が計れることが理解できる。[Table 2] From Table 1 and Table 2, the unevenness difference is 0.2 on the gas inflow side surface.
Compared with the filter material for air filters of Comparative Example 1 using the melt blown nonwoven fabric having almost no unevenness difference, the filter material for the air filter of Example 1 using the melt blown nonwoven fabric having the unevenness of 8 mm had an initial pressure loss, Despite being comparable in terms of collection efficiency, it has more than twice the dust holding capacity, and the filter unit made using it has a life of 2.5 times, greatly increasing the service life. Understand that you can measure.
【００３２】[0032]
【発明の効果】上記構成を備えたことにより、請求項１
に記載のエアフィルタ用濾材にあっては、メルトブロー
不織布の気体流入側表面に凹凸差が０．１〜１．０ｍｍ
の凹凸が形成されているため、塵埃はメルトブロー不織
布の厚み方向に分布して捕集されるので、保持容量が増
大し、使用寿命も延びる。また、凹凸を形成する際に加
圧成形などで凹部を緻密化することにより形成しておら
ず、該凹部と凸部における構造が実質的に均質であるた
め、通気抵抗（初期圧力損失）が増大したり、塵埃が偏
って捕集されたりすることがなく、メルトブロー不織布
の優れた捕集能力が維持されている。According to the present invention, the above-mentioned structure is provided.
In the filter material for an air filter described in (1), the unevenness difference is 0.1 to 1.0 mm on the gas inflow side surface of the melt blown nonwoven fabric.
Since the unevenness is formed, the dust is distributed and collected in the thickness direction of the meltblown nonwoven fabric, so that the holding capacity is increased and the service life is extended. Further, when forming the unevenness, the concave portion is not formed by densifying the concave portion by pressure molding or the like, and since the structure of the concave portion and the convex portion is substantially uniform, the ventilation resistance (initial pressure loss) is reduced. The excellent collection ability of the meltblown nonwoven fabric is maintained without increasing or dust being unevenly collected.
【００３３】また、請求項２に記載のエアフィルタ用濾
材にあっては、メルトブロー不織布がエレクトレット化
されているため、エレクトレット化による静電気的な捕
集効果と相まって高い捕集効率で微細な塵埃が捕集でき
る。Further, in the filter medium for an air filter according to the second aspect, since the melt-blown nonwoven fabric is made into an electret, fine dust is collected with a high collection efficiency in combination with the electrostatic collection effect due to the electret formation. Can be collected.
【００３４】また、請求項３に記載のエアフィルタ用濾
材にあっては、気体流入側表面に凹凸差が０．１〜１．
０ｍｍの凹凸が形成されているメルトブロー不織布と、
該メルトブロー不織布の上流側に配置された該メルトブ
ロー不織布よりも初期圧力損失の小さい支持用濾材と
が、部分的に結合されることにより、層間に空間を内包
して積層されているため、支持用濾材がプレフィルタと
して働き、しかも塵埃をメルトブロー不織布の厚み方向
に分布して捕集できると共に層間に形成される空間に塵
埃を保持することができるので、塵埃の保持容量が大き
くなり、使用寿命を延ばすことができる。また、支持用
濾材と積層することでプリーツ加工などの加工が行いや
すくなり、加工後の保形性もよくなる。Further, in the filter material for an air filter according to the third aspect of the present invention, the unevenness difference of 0.1 to 1.
A melt-blown non-woven fabric having 0 mm unevenness,
A supporting filter medium having an initial pressure loss smaller than that of the meltblown nonwoven fabric, which is arranged on the upstream side of the meltblown nonwoven fabric, is partially bonded to be laminated with a space between layers, so that it is used for supporting. The filter material acts as a pre-filter, and the dust can be distributed in the thickness direction of the melt-blown nonwoven fabric and collected, and the dust can be held in the space formed between the layers, so that the dust holding capacity is increased and the service life is extended. It can be postponed. Further, by laminating it with the supporting filter medium, processing such as pleating is facilitated and the shape retention after processing is improved.
【００３５】また、請求項４に記載のエアフィルタ用濾
材にあっては、プリーツ加工によって濾過に働く濾材の
表面積を大きくできるので、通気抵抗を下げ、塵埃の保
持容量を大きくし、結果として濾材の寿命を長くするこ
とができる。Further, in the filter medium for an air filter according to the fourth aspect, since the surface area of the filter medium which works for filtration can be increased by pleating, the ventilation resistance is lowered and the dust holding capacity is increased, resulting in the filter medium. The life of can be extended.
【図１】本発明のエアフィルタ用濾材の一例を示す平面
図。FIG. 1 is a plan view showing an example of a filter medium for an air filter of the present invention.
【図２】図１のエアフィルタ用濾材の部分拡大断面模型
図。FIG. 2 is a partially enlarged cross-sectional model view of the air filter medium of FIG.
【図３】本発明のエアフィルタ用濾材の他の例を示す平
面図（支持用濾材側から見た図）。FIG. 3 is a plan view showing another example of the filter medium for an air filter according to the present invention (view seen from the supporting filter medium side).
【図４】図３のエアフィルタ用濾材の部分拡大断面模型
図。4 is a partially enlarged cross-sectional model view of the filter medium for an air filter of FIG.
１・・・メルトブロー不織布 ２・・・凹部 ３・・・凸部 ４・・・支持用濾材 ５・・・結合部 ６・・・空間 1 ... Melt blown nonwoven fabric 2 ... Recessed portion 3 ... Convex portion 4 ... Supporting filter medium 5 ... Coupling portion 6 ... Space
Claims (4)
構成され、気体流入側表面に凹凸差が０．１〜１．０ｍ
ｍの凹凸が形成されており、該凹部と凸部における構造
が実質的に均質であるメルトブロー不織布からなること
を特徴とするエアフィルタ用濾材。1. A fiber having an average fiber diameter of 0.5 to 50 μm and having a surface roughness of 0.1 to 1.0 m on the gas inflow side.
A filter material for an air filter, characterized in that it is made of a melt-blown nonwoven fabric in which irregularities of m are formed and the structures of the concave portions and the convex portions are substantially uniform.
されていることを特徴とする請求項１に記載のエアフィ
ルタ用濾材。2. The filter medium for an air filter according to claim 1, wherein the meltblown nonwoven fabric is electretized.
構成され、気体流入側表面に凹凸差が０．１〜１．０ｍ
ｍの凹凸が形成されており、該凹部と凸部における構造
が実質的に均質であるメルトブロー不織布と、該メルト
ブロー不織布の上流側に配置された該メルトブロー不織
布よりも初期圧力損失の小さい支持用濾材とが、部分的
に結合されることにより、層間に空間を内包して積層さ
れていることを特徴とするエアフィルタ用濾材。3. A fiber having an average fiber diameter of 0.5 to 50 μm and having a surface roughness of 0.1 to 1.0 m on the gas inflow side.
m, the concave and convex portions are formed, and the structure of the concave and convex portions is substantially homogeneous, and the supporting filter medium having an initial pressure loss smaller than that of the melt blown nonwoven fabric arranged upstream of the melt blown nonwoven fabric. The filter material for an air filter, wherein and are partially bonded to each other so as to include a space between the layers.
とする請求項３に記載のエアフィルタ用濾材。4. The filter material for an air filter according to claim 3, which is pleated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07795994A JP3516979B2 (en) | 1994-03-23 | 1994-03-23 | Filter media for air filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07795994A JP3516979B2 (en) | 1994-03-23 | 1994-03-23 | Filter media for air filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07256026A true JPH07256026A (en) | 1995-10-09 |
| JP3516979B2 JP3516979B2 (en) | 2004-04-05 |
Family
ID=13648528
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP07795994A Expired - Fee Related JP3516979B2 (en) | 1994-03-23 | 1994-03-23 | Filter media for air filter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3516979B2 (en) |
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08302554A (en) * | 1995-05-08 | 1996-11-19 | Nippon Millipore Kk | Nonwoven fabric, its production and space-supporting material |
| JPH09192426A (en) * | 1996-01-19 | 1997-07-29 | Toray Ind Inc | Air filter nonwoven fabric and air filter using the same |
| JPH1071312A (en) * | 1996-08-30 | 1998-03-17 | Hoya Corp | Filter material, manufacture thereof, filter apparatus using filter material |
| JP2002001023A (en) * | 2000-06-19 | 2002-01-08 | Toyobo Co Ltd | Factory air-conditioning filter system and factory air- conditioning method |
| JP2002316012A (en) * | 2001-04-17 | 2002-10-29 | Nippon Muki Co Ltd | Washing regenerative air filter |
| JP2003033725A (en) * | 2001-07-24 | 2003-02-04 | Nagasawa Wire Cloth Co | Wire net, wire net filter and vibration screening machine |
| JP2006224007A (en) * | 2005-02-18 | 2006-08-31 | Japan Vilene Co Ltd | Filter medium and cylindrical filter using it |
| JP2007021455A (en) * | 2005-07-21 | 2007-02-01 | Toyobo Co Ltd | Filter with restoration properties |
| JP2009263811A (en) * | 2008-04-24 | 2009-11-12 | Kuraray Kuraflex Co Ltd | Composite fiber sheet composed of nonwoven fabric |
| JP2011036757A (en) * | 2009-08-07 | 2011-02-24 | Toyobo Co Ltd | Filter for dust |
| KR101017574B1 (en) * | 2008-10-02 | 2011-02-28 | 한라대학교산학협력단 | Air cleaning filter for adhesive type |
| JP2012143752A (en) * | 2011-01-12 | 2012-08-02 | General Electric Co <Ge> | Filter having flow control feature |
| JP2017538574A (en) * | 2014-12-19 | 2017-12-28 | ザ プロクター アンド ギャンブル カンパニー | Method for filtering particulates from air using a composite filter substrate containing a mixture of fibers |
| JP2017538873A (en) * | 2014-12-19 | 2017-12-28 | ザ プロクター アンド ギャンブル カンパニー | Composite filter substrate containing a mixture of fibers |
| WO2020203480A1 (en) * | 2019-03-29 | 2020-10-08 | 三菱製紙株式会社 | Filter material for air filter |
| JP2022527283A (en) * | 2019-03-28 | 2022-06-01 | ドナルドソン カンパニー，インコーポレイティド | Filtration medium with improved dust load |
-
1994
- 1994-03-23 JP JP07795994A patent/JP3516979B2/en not_active Expired - Fee Related
Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08302554A (en) * | 1995-05-08 | 1996-11-19 | Nippon Millipore Kk | Nonwoven fabric, its production and space-supporting material |
| JPH09192426A (en) * | 1996-01-19 | 1997-07-29 | Toray Ind Inc | Air filter nonwoven fabric and air filter using the same |
| JPH1071312A (en) * | 1996-08-30 | 1998-03-17 | Hoya Corp | Filter material, manufacture thereof, filter apparatus using filter material |
| JP2002001023A (en) * | 2000-06-19 | 2002-01-08 | Toyobo Co Ltd | Factory air-conditioning filter system and factory air- conditioning method |
| JP2002316012A (en) * | 2001-04-17 | 2002-10-29 | Nippon Muki Co Ltd | Washing regenerative air filter |
| JP2003033725A (en) * | 2001-07-24 | 2003-02-04 | Nagasawa Wire Cloth Co | Wire net, wire net filter and vibration screening machine |
| JP2006224007A (en) * | 2005-02-18 | 2006-08-31 | Japan Vilene Co Ltd | Filter medium and cylindrical filter using it |
| JP2007021455A (en) * | 2005-07-21 | 2007-02-01 | Toyobo Co Ltd | Filter with restoration properties |
| JP2009263811A (en) * | 2008-04-24 | 2009-11-12 | Kuraray Kuraflex Co Ltd | Composite fiber sheet composed of nonwoven fabric |
| KR101017574B1 (en) * | 2008-10-02 | 2011-02-28 | 한라대학교산학협력단 | Air cleaning filter for adhesive type |
| JP2011036757A (en) * | 2009-08-07 | 2011-02-24 | Toyobo Co Ltd | Filter for dust |
| JP2012143752A (en) * | 2011-01-12 | 2012-08-02 | General Electric Co <Ge> | Filter having flow control feature |
| JP2017538574A (en) * | 2014-12-19 | 2017-12-28 | ザ プロクター アンド ギャンブル カンパニー | Method for filtering particulates from air using a composite filter substrate containing a mixture of fibers |
| JP2017538873A (en) * | 2014-12-19 | 2017-12-28 | ザ プロクター アンド ギャンブル カンパニー | Composite filter substrate containing a mixture of fibers |
| US10300420B2 (en) | 2014-12-19 | 2019-05-28 | The Procter & Gamble Company | Method of filtering particulates from the air using a composite filter substrate comprising a mixture of fibers |
| EP3233238B1 (en) * | 2014-12-19 | 2022-03-16 | The Procter & Gamble Company | Method of filtering particulates from the air using a composite filter substrate comprising a mixture of fibers |
| JP2022527283A (en) * | 2019-03-28 | 2022-06-01 | ドナルドソン カンパニー，インコーポレイティド | Filtration medium with improved dust load |
| WO2020203480A1 (en) * | 2019-03-29 | 2020-10-08 | 三菱製紙株式会社 | Filter material for air filter |
| JP6824476B1 (en) * | 2019-03-29 | 2021-02-03 | 三菱製紙株式会社 | Filter material for air filter |
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