JP2002001020A - Filtering medium - Google Patents
Filtering mediumInfo
- Publication number
- JP2002001020A JP2002001020A JP2001111564A JP2001111564A JP2002001020A JP 2002001020 A JP2002001020 A JP 2002001020A JP 2001111564 A JP2001111564 A JP 2001111564A JP 2001111564 A JP2001111564 A JP 2001111564A JP 2002001020 A JP2002001020 A JP 2002001020A
- Authority
- JP
- Japan
- Prior art keywords
- filter medium
- section
- medium according
- nonwoven fabric
- filter
- 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
Links
Landscapes
- Laminated Bodies (AREA)
- Nonwoven Fabrics (AREA)
- Paper (AREA)
- Filtering Materials (AREA)
- Electrostatic Separation (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、一般産業用、空調
用、空気清浄機用、掃除機用、エアコン用として広く使
用でき、特にプリーツ型等立体的な形状に形成するのに
好適な濾材に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention can be widely used for general industrial use, air conditioning, air purifiers, vacuum cleaners, and air conditioners, and is particularly suitable for forming a pleated filter into a three-dimensional shape. About.
【０００２】[0002]
【従来の技術】空気清浄機用等に用いられる濾材として
は、たとえば、実公平３−２６９０２号公報に、合成繊
維などの短繊維で構成したウエブをラテックス液に含
浸、乾燥して繊維を樹脂で結合した短繊維樹脂加工不織
布と帯電処理が施されたエレクトレット化メルトブロー
不織布とを積層した濾材が開示されている。しかしなが
ら、この濾材は、１〜３ｍｍ程度のジグザグ状の倦縮を
有する長さ２０〜７０ｍｍの短繊維を用いており、これ
をウエブ化してラテックスを含浸し押し固めても、繊維
が倦縮のためにバネ的な弾性を有し厚みが回復し厚く仕
上がる。このため、一定容積のフィルタ枠に収められる
濾材量が少なくなり、大風量を低圧力損失に処理しよう
とすると大型化が避けられない。2. Description of the Related Art As a filter medium used for an air purifier, for example, Japanese Utility Model Publication No. 3-26902 discloses that a web composed of short fibers such as synthetic fibers is impregnated with a latex liquid, dried, and the fibers are resinized. Discloses a filter medium in which a short fiber resin-processed nonwoven fabric bonded by the above method and an electret melt-blown nonwoven fabric subjected to a charging treatment are laminated. However, this filter medium uses a short fiber having a length of 20 to 70 mm having a zigzag crimp of about 1 to 3 mm, and even if it is formed into a web and impregnated with latex and compacted, the fiber is not cramped. Therefore, it has spring-like elasticity and the thickness recovers, resulting in a thick finish. For this reason, the amount of the filter medium accommodated in the filter frame of a fixed volume is reduced, and if a large air volume is to be treated with a low pressure loss, an increase in size is inevitable.
【０００３】また、特許第２６７２９８４号公報には、
ＨＥＰＡフィルタ用濾材として、異形断面繊維、フィブ
リル化繊維、極細有機繊維からなる濾材が開示されてい
る。しかしながら、この構成では、ＨＥＰＡフィルタと
しての性能を得るには、繊維で仕切られた間隔を小さく
して物理的に粒子が通らないようにするために極細繊維
の使用が必須であり、そのため、繊維と空気が接触して
生じる摩擦抵抗、いわゆる通気抵抗が高くなり、圧力損
失を抑えることが難しい。[0003] Also, Japanese Patent No. 2672984 discloses that
As a filter material for a HEPA filter, a filter material comprising a modified cross-section fiber, a fibrillated fiber, and an ultrafine organic fiber is disclosed. However, in this configuration, in order to obtain the performance as a HEPA filter, the use of ultrafine fibers is indispensable in order to reduce the space partitioned by the fibers and physically prevent the particles from passing therethrough. The frictional resistance caused by the contact between the air and the air, the so-called airflow resistance, increases, making it difficult to suppress the pressure loss.
【０００４】さらに、特開平２−２４３１２７号公報に
は、帯電加工不織布と濾紙とを積層した掃除機用濾材
が、また、特公昭６３−５６８１１号公報には、交絡繊
維からなる不織布と濾紙とを接合した濾材が示されてい
るが、いずれも山谷折りを短いピッチで繰り返すプリー
ツ加工を施すには剛性が低く好ましくない。Further, Japanese Patent Application Laid-Open No. 2-243127 discloses a filter material for a vacuum cleaner in which a charged nonwoven fabric and a filter paper are laminated, and Japanese Patent Publication No. 63-56811 discloses a nonwoven fabric composed of entangled fibers and a filter paper. Are shown, but the rigidity is unfavorably low for performing pleating in which ridge and valley folds are repeated at a short pitch.
【０００５】[0005]
【発明が解決しようとする課題】本発明は、小型化が可
能で大容量の流体を処理できる、薄くて低圧力損失かつ
高剛性の濾材を提供することを目的とする。SUMMARY OF THE INVENTION An object of the present invention is to provide a thin, low-pressure-loss and high-rigidity filter medium which can be miniaturized and can process a large volume of fluid.
【０００６】[0006]
【課題を解決するための手段】本発明は、異形断面繊維
シートと帯電加工不織布とを接合した濾材を特徴とする
ものである。SUMMARY OF THE INVENTION The present invention is characterized by a filter medium in which a fiber sheet having an irregular cross section and a non-woven fabric subjected to charging are joined.
【０００７】ここでは、異形断面繊維シートがＹ型断面
のレーヨン繊維を含んでいること、異形断面シートがガ
ラス繊維を多くとも５０重量％含んでいることが好まし
い。また、異形断面繊維シートは、シート製造時のＭＤ
方向に対して４５度方向の剛軟度が１００ｍｇ以上のも
のや、抄紙法で製造されているものが好ましい。さら
に、帯電加工不織布がメルトブロー不織布であること、
帯電加工不織布に含まれる繊維の平均繊維径が７μｍ以
下であることも好ましい。さらにまた、帯電加工不織布
が、濾過風速５．３ｃｍ／秒の条件下において粒子径
０．３μｍの粒子に対するＱＦ値が０．５以上のもので
あること、異形断面繊維シートと帯電加工不織布との接
合が、ウレタン樹脂によって行われていることが好まし
く、濾材は粒子径０．３μｍの粒子に対する捕集効率が
９９．９７％以上であることも好ましい。Here, it is preferable that the modified cross-section fiber sheet contains rayon fibers having a Y-shaped cross section, and that the modified cross section sheet contains at most 50% by weight of glass fibers. In addition, the deformed cross-section fiber sheet is manufactured by MD at the time of sheet production.
It is preferable that the rigidity in the direction of 45 degrees with respect to the direction is 100 mg or more, or that the paper is manufactured by a papermaking method. Further, that the charged nonwoven fabric is a melt blown nonwoven fabric,
It is also preferable that the average fiber diameter of the fibers contained in the charged nonwoven fabric is 7 μm or less. Furthermore, the charged nonwoven fabric has a QF value of 0.5 or more for particles having a particle diameter of 0.3 μm under the condition of a filtration air velocity of 5.3 cm / sec. The joining is preferably performed by a urethane resin, and the filter medium preferably has a collection efficiency of 99.97% or more for particles having a particle diameter of 0.3 μm.
【０００８】そして、上記いずれかに記載の濾材を備え
たフィルタユニットも好ましい態様であり、上記フィル
タユニットは空気清浄機用フィルタユニットであること
も好ましい。[0008] A preferred embodiment is also a filter unit provided with any one of the above-mentioned filter media, and the filter unit is also preferably a filter unit for an air purifier.
【０００９】[0009]
【発明の実施の形態】本発明の濾材は、図１に示すよう
に、異形断面繊維シート３と帯電加工不織布２とが接合
されて形成されている。この構成によって、主に、濾材
の強度は、薄くて剛性の高い異形断面繊維シート３が主
に担い、また、濾材の捕集性能は、帯電加工によって、
不織布の目による捕集だけでなく静電気による捕集もで
きる、高効率捕集が可能な帯電加工不織布２が担うもの
となる。この結果、濾材全体としての厚みを抑えること
ができ、フィルタユニット化の際に小型化が可能にな
り、同時に、強度を付与するために不織布等を何層にも
重ね合わせたりする必要がない。そして、本発明におい
ては、濾過性能を発揮する部分が帯電加工不織布のた
め、繊維間の距離を大きくしても或いは繊維径を大きく
しても静電気による捕集力を有し、低圧力損失および高
捕集性能を両立することができ、また、厚みを薄くでき
るため、一定容積のフィルタ枠に収められる濾材量を多
くすることができ、低圧力損失かつ大量処理が可能とな
る。DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a filter medium of the present invention is formed by bonding a fiber sheet 3 having an irregular cross section and a non-woven fabric 2 to be charged. According to this configuration, the strength of the filter medium is mainly carried by the thin and rigid, irregularly-shaped cross-section fiber sheet 3, and the collection performance of the filter medium is improved by charging.
The charged nonwoven fabric 2 that can collect not only by the eyes of the nonwoven fabric but also by static electricity and that can perform high-efficiency collection plays a role. As a result, the thickness of the filter medium as a whole can be suppressed, and the filter unit can be reduced in size when formed into a filter unit. At the same time, it is not necessary to stack multiple layers of nonwoven fabric or the like in order to impart strength. And, in the present invention, since the portion exhibiting the filtering performance is a charged nonwoven fabric, even if the distance between the fibers or the fiber diameter is increased, the portion has a trapping force due to static electricity, and has a low pressure loss and Since both high collection performance can be achieved and the thickness can be reduced, the amount of filter medium that can be accommodated in a filter frame having a fixed volume can be increased, and low pressure loss and large-scale processing can be performed.
【００１０】異形断面繊維シート３は、断面が三角形や
Ｙ型、Ｔ型、Ｘ型等になるように紡糸された異形断面繊
維が、ポリビニルアルコール樹脂、酢酸ビニル樹脂、ア
クリル樹脂などのバインダーと、たとえば重量比８対２
の割合で混ぜられて形成されている。これらの異形断面
繊維は、単一で用いても混在させてもよいが、薄くてよ
り剛性の高いシートとするためには、Ｙ型の異形断面糸
を用いることが好ましい。また、異形断面繊維シート３
は、異形断面繊維以外の繊維と混合されて成形されても
よいが、プリーツ加工や風圧によっても変形し難い剛性
を得るためには、異形断面繊維シート３に含まれる繊維
の少なくとも７０重量％が異形断面繊維であることが好
ましい。The modified cross-section fiber sheet 3 comprises a cross-section fiber spun so as to have a triangular, Y-shaped, T-shaped, or X-shaped cross section, and a binder such as a polyvinyl alcohol resin, a vinyl acetate resin, or an acrylic resin. For example, a weight ratio of 8 to 2
It is formed by mixing at the ratio of These modified cross-section fibers may be used singly or mixed, but in order to obtain a thinner and more rigid sheet, it is preferable to use a Y-shaped modified cross-section yarn. In addition, the modified cross-section fiber sheet 3
May be mixed with a fiber other than the modified cross-section fiber to be molded. However, in order to obtain rigidity that is hardly deformed even by pleating or wind pressure, at least 70% by weight of the fiber included in the modified cross-section fiber sheet 3 is required. It is preferable that the fibers have irregular cross sections.
【００１１】ここで、フィルタの圧力損失は、主に、濾
材そのものによる圧力損失と、濾材をたとえばプリーツ
加工等し山谷状に折り加工してユニット化することによ
って生じる構造圧力損失（風を流した場合に空気の通ら
ない部分による圧力損失）の２つに起因する。濾材を山
谷状に折り加工した場合、構造圧力損失はその山谷の屈
曲点付近で生じるが、濾材の厚みが厚い程、また濾材の
剛性が低い程、濾材同士の接触面積が増加し、構造圧力
損失が大きくなる。Here, the pressure loss of the filter is mainly caused by the pressure loss caused by the filter medium itself and the structural pressure loss caused by folding the filter medium into a valley-like shape by, for example, pleating or the like to form a unit (wind-flowing). Pressure loss due to air-impermeable parts in some cases). When the filter media is folded into a mountain valley, the structural pressure loss occurs near the inflection points of the valleys, but as the thickness of the filter media increases and the rigidity of the filter media decreases, the contact area between the filter media increases, The loss increases.
【００１２】そこで、本発明においては、フィルタの構
造圧力損失を極力抑えるために、シート製造時のＭＤ方
向に対して４５度方向の剛軟度が１００ｍｇ以上、好ま
しくは２００ｍｇ以上の異形断面繊維シート、また、厚
みが０．３５ｍｍ以下、好ましくは０．２ｍｍ以下の異
形断面繊維シートを用いることが好ましい。剛軟度は、
ＪＩＳ Ｌ１０８５Ｂ法に準じ、ＭＤ方向に対して４５
度方向とは、シート製造時におけるシートの流れ方向に
対して４５度方向に軸をとって試料を採取すことを意味
する。これは縦方向および横方向のいずれか一方が剛性
の高い材料では、プリーツの加工性が悪かったりミニプ
リーツ化した場合、山の稜線方向で膨らみが生じて隣接
するプリーツ片の触れ合う面積が増え構造圧力損失が増
すためである。Therefore, in the present invention, in order to minimize the structural pressure loss of the filter, the fiber sheet having a modified cross section having a stiffness in the direction of 45 degrees with respect to the MD direction at the time of sheet production of 100 mg or more, preferably 200 mg or more. Further, it is preferable to use a fiber sheet having a modified cross section having a thickness of 0.35 mm or less, preferably 0.2 mm or less. The softness is
45 in the MD direction according to JIS L1085B method
The degree direction means that a sample is taken by taking an axis in the direction of 45 degrees with respect to the sheet flow direction at the time of sheet production. This is because if the pleat is poor in workability or mini-pleated with a material with high rigidity in either the longitudinal direction or the lateral direction, bulging occurs in the ridge direction of the mountain and the area where the adjacent pleat pieces touch each other increases. This is because the pressure loss increases.
【００１３】また、異形断面繊維シート３は、スパンボ
ンド法や異形断面の短繊維を樹脂加工する方法によって
も製造することができるが、倦縮を持たない数ｍｍから
２０ｍｍ以下の直線状の繊維を使用でき、繊維の積層が
平面的に薄くできる抄紙法によって製造されたものが好
ましい。また、抄紙法による異形断面繊維シートは、水
に分散した繊維をネットで捕集するため、繊維、剛性に
方向性が生じにくく、構造圧力損失の発生を防ぐことが
できる。The modified cross-section fiber sheet 3 can also be produced by a spunbonding method or a method of processing short fibers having a modified cross section with a resin. And those produced by a papermaking method in which the lamination of fibers can be made thinner in a plane. Further, the fiber sheet of irregular cross section formed by the papermaking method collects fibers dispersed in water with a net, so that it is difficult for the fibers and rigidity to have directivity, and it is possible to prevent the occurrence of structural pressure loss.
【００１４】異形断面繊維としては、ガラスやレーヨ
ン、ビニロン、芳香族ポリアミドなどの繊維を用いるこ
とができるが、中でも安価で剛性が高く焼却処理も可能
なレーヨン繊維や、剛性が高く濾材の薄型化、低圧力損
失化を可能にするガラス繊維が好ましい。そして、レー
ヨン繊維を用いる場合には、そのレーヨン繊維との接合
力に優れたポリビニルアルコールをバインダーとして用
いることが好ましい。また、ガラス繊維を用いる場合
は、繊維径５〜２５μｍの範囲の繊維を５０重量％以下
の範囲で混合することが好ましい。これにより、ガラス
繊維自体の割れが生じにくく、帯電加工不織布２との接
合性の問題も生じにくい。Fibers such as glass, rayon, vinylon, and aromatic polyamide can be used as the modified cross-section fibers. Among them, rayon fibers that are inexpensive and have high rigidity and can be incinerated, and thinner high-rigidity filter media can be used. Glass fibers that enable low pressure loss are preferred. When rayon fibers are used, it is preferable to use polyvinyl alcohol having excellent bonding strength with the rayon fibers as a binder. When glass fibers are used, fibers having a fiber diameter of 5 to 25 μm are preferably mixed in a range of 50% by weight or less. This makes it difficult for the glass fiber itself to crack, and hardly causes a problem of bonding with the charged nonwoven fabric 2.
【００１５】また、低圧力損失化のためには通気度を高
く、たとえば１００ｃｃ／秒／ｃｍ 2にすることが好ま
しいが、そのためには３デニール以上の繊維を用いるこ
とが好ましい。In order to reduce pressure loss, the air permeability must be increased.
For example, 100 cc / sec / cm TwoPrefer to
However, for this purpose, use fibers of 3 denier or more.
Is preferred.
【００１６】次に、帯電加工不織布２としては、たとえ
ばメルトブロー不織布やスパンボンド不織布を用いる
と、繊維表面に界面活性剤などの帯電性を低下させる成
分がなく、電荷を長く維持できるので好ましい。帯電加
工したフィルムを切断し繊維状としたものを集合化した
不織布も好適に用いることができる。目付や繊維径は要
求される捕集効率に合うように適宜決定すればよい。た
とえば家庭用空気清浄機に用いるフィルタにおいて、た
ばこの煙の除去効率を高めるため捕集効率を９５％以上
にするためには、濾材を薄くして圧力損失を低減するの
が好ましいが、この場合、平均繊維径が７μｍ以下、よ
り好ましくは５μｍ以下になる繊維を用いた目付が５〜
６０ｇ／ｍ2範囲にある不織布が好ましい。なお、本発
明において、捕集効率とは、濾材に対して風速５．３ｃ
ｍ／秒で空気を通したときに粒子径０．３μｍの粒子が
どれだけ濾過されるかを示すものである。Next, for example, a melt-blown non-woven fabric or a spun-bonded non-woven fabric is preferably used as the charged-processed non-woven fabric 2 because there is no component such as a surfactant on the fiber surface which lowers the chargeability and the charge can be maintained for a long time. A nonwoven fabric obtained by cutting a charge-processed film into a fibrous form can also be suitably used. The basis weight and fiber diameter may be appropriately determined so as to meet the required collection efficiency. For example, in a filter used in a household air purifier, it is preferable to reduce the pressure loss by thinning the filter material in order to increase the collection efficiency to 95% or more in order to increase the efficiency of removing tobacco smoke. The average fiber diameter is 7 μm or less, more preferably 5 μm or less, using a fiber having a basis weight of 5 μm or less.
Nonwovens in the range of 60 g / m 2 are preferred. In the present invention, the collection efficiency is defined as a wind speed of 5.3 c with respect to the filter medium.
This indicates how much particles having a particle diameter of 0.3 μm are filtered when air is passed through the air at m / sec.
【００１７】上述の異形断面繊維シート３と帯電加工不
織布２とは、たとえばホットメルト樹脂によって接合さ
れる。このとき、溶融ホットメルト樹脂を細ノズルから
微細繊維状に噴射して異形断面繊維シート３や帯電加工
不織布２に付与し、両者を重ね合わせると、圧力損失上
昇を防ぎつつ接合できるので好ましい。そして、ホット
メルト樹脂としては、ウレタン樹脂やポリオレフィン樹
脂、エチルビニルアルコール樹脂などを用いることがで
きるが、ウレタン樹脂は変成させることにより再加熱し
ても溶融しない耐熱性に優れた湿気硬化型ウレタン樹脂
とすることができ、好ましい。また、超音波によって接
合を行う場合には安価にできる。The above-mentioned irregularly shaped cross-section fiber sheet 3 and the charged nonwoven fabric 2 are joined by, for example, a hot melt resin. At this time, it is preferable to inject the molten hot melt resin into a fine fiber form from a fine nozzle to apply it to the deformed cross-section fiber sheet 3 or the charged nonwoven fabric 2 and to superimpose both of them, because it is possible to join while preventing an increase in pressure loss. As the hot melt resin, a urethane resin, a polyolefin resin, an ethyl vinyl alcohol resin, or the like can be used, but the urethane resin is a moisture-curable urethane resin excellent in heat resistance that does not melt even if reheated by denaturation. It is preferable. In addition, when bonding is performed by ultrasonic waves, the cost can be reduced.
【００１８】なお、本発明において、帯電加工不織布２
は、上述したように異形断面繊維シート３の片面だけで
も、また、両面に設けてもよい。In the present invention, the charged nonwoven fabric 2
May be provided on only one side of the modified cross-section fiber sheet 3 or on both sides as described above.
【００１９】空気清浄機用フィルタユニットは、低騒音
・省エネルギーが重要であり、この目的達成のためによ
り低圧力損失な帯電加工不織布が適している。この目的
は、品質係数ＱＦ値の高いエレクトレット不織布濾材を
用いることで達成できる。ＱＦ値とは、濾材の透過率の
自然対数および圧力損失から、次式のように計算される
ものである。 ＱＦ[１／Ｐａ]＝−ｌｎ（透過率[％]）／圧力損失[Ｐ
ａ] ここで、透過率は、濾材に対して風速５．３ｃｍ／秒で
空気を通したときに粒子径０．３μｍの粒子がどれだけ
透過するかを示すものであり、圧力損失は、濾材に対し
て風速５．３ｃｍ／秒で空気を通したときの値である。For the filter unit for an air purifier, low noise and energy saving are important, and to achieve this object, a non-charged nonwoven fabric having a lower pressure loss is suitable. This object can be achieved by using an electret nonwoven fabric filter medium having a high quality factor QF value. The QF value is calculated from the natural logarithm of the transmittance of the filter medium and the pressure loss as follows. QF [1 / Pa] =-ln (transmittance [%]) / pressure loss [P
a] Here, the transmittance indicates how much particles having a particle diameter of 0.3 μm are transmitted when air is passed through the filter medium at a wind speed of 5.3 cm / sec. Is a value when air is passed at a wind speed of 5.3 cm / sec.
【００２０】通常のコロナ放電方式でのエレクトレット
不織布濾材のＱＦ値は０．０５程度であるが、不織布に
水を接触させた後、乾燥させることにより電荷を生じさ
せたハイドロチャージ方式エレクトレット不織布濾材の
場合には０．５以上とすることが可能である。これは、
ハイドロチャージ方式では不織布の電荷密度を高くでき
るため、同じ圧力損失でも透過率を低くできるためであ
る。すなわち、より低圧力損失で、透過率を低くすなわ
ち捕集効率を高くできるために、特に家庭用の空気清浄
機用フィルタとして好適であり、特に粒子径が０．３μ
ｍの粒子に対する捕集効率が９９．９７％以上であるＨ
ＥＰＡフィルタであると低騒音・省エネルギー性を発揮
できる。The QF value of the electret nonwoven fabric filter material in the ordinary corona discharge method is about 0.05. However, the water is brought into contact with the nonwoven fabric and then dried to generate a charge by the hydrocharge type electret nonwoven fabric filter material. In this case, it can be set to 0.5 or more. this is,
This is because the charge density of the nonwoven fabric can be increased in the hydrocharge method, so that the transmittance can be reduced even with the same pressure loss. That is, with a lower pressure loss, the transmittance can be lowered, that is, the collection efficiency can be increased.
H whose collection efficiency for particles of m is 99.97% or more
An EPA filter can exhibit low noise and energy saving.
【００２１】[0021]
【実施例】＜実施例１＞Ｙ型断面のレーヨン繊維と、バ
インダー繊維としてのポリビニルアルコール繊維とを、
８対２の重量比で含む異形断面繊維シート（繊度７．５
デニール、目付４０ｇ／ｍ2、通気度１５０ｃｃ／秒／
ｃｍ2、厚み０．１９ｍｍ、剛軟度１５８ｍｇ、バイン
ダーがポリビニルアルコール繊維）の表面に、細ノズル
から溶融噴射して微粒子した湿気硬化型ウレタン樹脂を
付着させ、ついで帯電加工処理したポリプロピレンメル
トブロー不織布（繊維径１．７μｍ、目付２０ｇ／
ｍ2、捕集効率９９．５％、圧力損失１０Ｐａ、厚さ
０．１６ｍｍ）を接合し、厚さ０．３２ｍｍの濾材を得
た。<Example 1> A rayon fiber having a Y-shaped cross section and a polyvinyl alcohol fiber as a binder fiber were used.
A fiber sheet with a modified cross section containing a weight ratio of 8 to 2 (fineness 7.5
Denier, basis weight 40 g / m 2 , air permeability 150 cc / sec /
cm 2 , thickness 0.19 mm, softness 158 mg, binder: polyvinyl alcohol fiber) A fine-grained moisture-curable urethane resin melt-sprayed from a fine nozzle is adhered to the surface of a fine nozzle, and then subjected to electrification processing. Fiber diameter 1.7μm, basis weight 20g /
m 2 , a collection efficiency of 99.5%, a pressure loss of 10 Pa, and a thickness of 0.16 mm) to obtain a filter medium having a thickness of 0.32 mm.
【００２２】この濾材に、山高さ３０ｍｍ、山数１３
９、山ピッチ３．６６ｍｍになるようプリーツ加工を施
し、５１０×３００×３２ｍｍの枠体内に収納し、濾材
面積２．４９ｍ2のフィルタユニットを得た。そのフィ
ルタユニットを風量４．５ｍ3／分（３．０ｃｍ／秒）
で評価したところ、この条件下での圧力損失は１８Ｐａ
であった。This filter medium has a peak height of 30 mm and a peak number of 13
9. Pleating was performed so that the pitch was 3.66 mm, and housed in a frame of 510 × 300 × 32 mm to obtain a filter unit having a filter medium area of 2.49 m 2 . The filter unit has an air flow of 4.5 m 3 / min (3.0 cm / sec)
The pressure loss under this condition was 18 Pa
Met.
【００２３】＜実施例２＞実施例１と同じ異形断面繊維
シートの表面に、細ノズルから溶融噴射して微粒子した
湿気硬化型ウレタン樹脂を付着させ、ついでＱＦ値０．
５７（透過率０．０１％、圧力損失８．０Ｐａ、目付２
０ｇ／ｍ2、平均繊維径１．６μｍ）の帯電加工不織布
を接合した濾材（ＱＦ値０．５１、透過率０．０１％、
圧力損失９．１Ｐａ）を得た。<Example 2> A moisture-curable urethane resin, which was melt-sprayed from a fine nozzle and finely divided, was attached to the surface of the fiber sheet having the same irregular cross-section as in Example 1, and then had a QF value of 0.1.
57 (transmittance 0.01%, pressure loss 8.0 Pa, basis weight 2
0 g / m 2 , filter material (QF value 0.51, transmittance 0.01%) bonded to a charged nonwoven fabric having an average fiber diameter of 1.6 μm).
A pressure loss of 9.1 Pa) was obtained.
【００２４】この濾材に、山高さ３０ｍｍ、山数１１
３、山ピッチ３．４５ｍｍになるようプリーツ加工を施
し、３９２×３１０×３２ｍｍの枠体内に収納し、濾材
面積２．１ｍ2のフィルタユニットを得た。そのフィル
タユニットを風量４ｍ3／分（３．２ｃｍ／秒）で評価
したところ、この条件下での圧力損失は５．８Ｐａ、捕
集効率は９９．９８５％であった。The filter medium has a peak height of 30 mm and a peak number of 11
3. Pleated to give a peak pitch of 3.45 mm, housed in a frame of 392 × 310 × 32 mm, and obtained a filter unit having a filter medium area of 2.1 m 2 . When the filter unit was evaluated at an air flow rate of 4 m 3 / min (3.2 cm / sec), the pressure loss under this condition was 5.8 Pa, and the collection efficiency was 99.985%.
【００２５】このフィルタユニットを空気清浄機に取付
けて評価したところ、風量４ｍ3／分での騒音レベルは
２０ｄｂで非常に低騒音であった。When this filter unit was attached to an air purifier and evaluated, the noise level at a flow rate of 4 m 3 / min was 20 db, which was very low.
【００２６】＜比較例＞異形断面繊維シートの代わりに
短繊維樹脂加工不織布（厚さ０．４２ｍｍ、剛軟度２５
０ｍｇ、目付５０ｇ／ｍ2、通気度２５０ｃｃ／秒／ｃ
ｍ2、バインダーアクリル樹脂）を用いた以外は実施例
１と同様にして、厚み０．５５ｍｍの濾材を得た。<Comparative Example> A nonwoven fabric processed with short fiber resin (thickness 0.42 mm, rigidity 25
0 mg, basis weight 50 g / m 2 , air permeability 250 cc / sec / c
m 2 , a binder acrylic resin) to obtain a filter material having a thickness of 0.55 mm in the same manner as in Example 1.
【００２７】この濾材に、山高さ３０ｍｍ、山数１３
９、山ピッチ３．６６ｍｍになるようなプリーツ加工を
施し、実施例１と同様のユニット化条件で評価したとこ
ろ、圧力損失は３２Ｐａと、構造圧力損失が多く発生す
ることがわかった。The filter medium has a peak height of 30 mm and a peak number of 13
9. Pleating was performed so that the peak pitch was 3.66 mm, and evaluation was performed under the same unit conditions as in Example 1. As a result, it was found that the pressure loss was 32 Pa, and that a large structural pressure loss occurred.
【００２８】[0028]
【発明の効果】本発明の濾材は、異形断面繊維シートと
帯電加工不織布とを接合したものであるので、濾材の強
度は主に薄くて剛性の高い異形断面繊維シートによっ
て、濾材の捕集性能は主に帯電加工不織布で発揮し、そ
の結果、濾材全体としての厚みを抑えることができる。
そして、濾材を山谷折りする場合にも、谷底部分での濾
材同士の接触面積を減らして構造圧力損失を低減するこ
とができるので、低圧力損失でかつ大容量の流体を処理
できるフィルタとなる。Since the filter medium of the present invention is obtained by joining a deformed cross-section fiber sheet and a charged nonwoven fabric, the strength of the filter medium is mainly reduced by the thin and rigid deformed cross-section fiber sheet. Is mainly exerted by the non-woven fabric charged, and as a result, the thickness of the entire filter medium can be suppressed.
In addition, even when the filter medium is folded into valleys and valleys, the contact area between the filter media at the bottoms of the valleys can be reduced to reduce the structural pressure loss, so that the filter can process a large volume fluid with low pressure loss.
【図１】本発明の一実施態様に係る濾材の概略断面図で
ある。FIG. 1 is a schematic sectional view of a filter medium according to one embodiment of the present invention.
１：濾材 ２．帯電加工不織布 ３：異形断面繊維シート 1: Filter medium 2. Charged non-woven fabric 3: Fiber sheet with irregular cross section
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｂ３２Ｂ 5/26 Ｂ３２Ｂ 5/26 Ｄ０４Ｈ 3/16 Ｄ０４Ｈ 3/16 Ｄ２１Ｈ 13/08 Ｄ２１Ｈ 13/08 13/40 13/40 15/02 15/02 27/08 27/08 Ｆターム(参考） 4D019 AA01 BA04 BA13 BB03 BB10 BC01 CA02 CB04 4D054 AA11 BC16 4F100 AG00A AJ06A AK07 AK23 AK51G BA02 CB02 DG06A DG15B DG18 DG20A EH41A GB41 GB56 JD01 JD05B JG03B JK01 JK12A JL03 YY00A YY00B 4L047 AA05 AA12 AA14 AA16 AA28 AB09 AB10 BA09 BA12 BA21 BB03 BC12 CA02 CA05 CB01 CB08 CC12 4L055 AF04 AF09 AF46 AG85 AH37 BE14 EA27 EA32 FA13 FA14 GA31 ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 Identification code FI Theme coat ゛ (Reference) B32B 5/26 B32B 5/26 D04H 3/16 D04H 3/16 D21H 13/08 D21H 13/08 13/40 13/40 15/02 15/02 27/08 27/08 F-term (Reference) 4D019 AA01 BA04 BA13 BB03 BB10 BC01 CA02 CB04 4D054 AA11 BC16 4F100 AG00A AJ06A AK07 AK23 AK51G BA02 CB02 DG06A DG15B DG18 JDG41 GBHJB GB01 JK01 JK12A JL03 YY00A YY00B 4L047 AA05 AA12 AA14 AA16 AA28 AB09 AB10 BA09 BA12 BA21 BB03 BC12 CA02 CA05 CB01 CB08 CC12 4L055 AF04 AF09 AF46 AG85 AH37 BE14 EA27 EA32 FA13 FA14 GA31
Claims (12)
接合したことを特徴とする濾材。1. A filter medium comprising a fiber sheet having an irregular cross section and a non-woven fabric charged with electricity.
繊維を含んでいる、請求項１に記載の濾材。2. The filter medium according to claim 1, wherein the fiber sheet having a modified cross section contains rayon fibers having a Y-shaped cross section.
０重量％含んでいる、請求項１または２に記載の濾材。3. The modified cross-section sheet contains at most 5 glass fibers.
The filter medium according to claim 1, which contains 0% by weight.
Ｄ方向に対して４５度方向の剛軟度が１００ｍｇ以上の
ものである、請求項１〜３のいずれかに記載の濾材。4. The modified cross-section fiber sheet has a M
The filter medium according to any one of claims 1 to 3, wherein the softness in a 45-degree direction with respect to the D direction is 100 mg or more.
ものである、請求項１〜４のいずれかに記載の濾材。5. The filter medium according to claim 1, wherein the irregularly shaped fiber sheet is produced by a papermaking method.
る、請求項１〜５のいずれかに記載の濾材。6. The filter medium according to claim 1, wherein the charged nonwoven fabric is a melt blown nonwoven fabric.
径が７μｍ以下である、請求項１〜６のいずれかに記載
の濾材。7. The filter medium according to claim 1, wherein the average fiber diameter of the fibers contained in the charged nonwoven fabric is 7 μm or less.
秒の条件下において粒子径０．３μｍの粒子に対するＱ
Ｆ値が０．５以上のものである、請求項１〜７のいずれ
かに記載の濾材。8. The charged nonwoven fabric has a filtration air velocity of 5.3 cm / cm.
Q for particles with a particle size of 0.3 μm under the condition of seconds
The filter medium according to any one of claims 1 to 7, wherein the F value is 0.5 or more.
接合が、ウレタン樹脂によって行われている、請求項１
〜８のいずれかに記載の濾材。9. The bonding between the fiber sheet having an irregular cross section and the nonwoven fabric having been subjected to electrification processing is performed by using a urethane resin.
The filter medium according to any one of claims 1 to 8.
率が９９．９７％以上である、請求項１〜９のいずれか
に記載の濾材。10. The filter medium according to claim 1, which has a collection efficiency of 99.97% or more for particles having a particle diameter of 0.3 μm.
を備えたフィルタユニット。11. A filter unit comprising the filter medium according to claim 1.
請求項１１に記載のフィルタユニット。12. A filter unit for an air purifier,
The filter unit according to claim 11.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001111564A JP2002001020A (en) | 2000-04-10 | 2001-04-10 | Filtering medium |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000107683 | 2000-04-10 | ||
| JP2000-107683 | 2000-04-10 | ||
| JP2001111564A JP2002001020A (en) | 2000-04-10 | 2001-04-10 | Filtering medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002001020A true JP2002001020A (en) | 2002-01-08 |
Family
ID=26589763
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001111564A Pending JP2002001020A (en) | 2000-04-10 | 2001-04-10 | Filtering medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2002001020A (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005063359A1 (en) * | 2003-12-25 | 2005-07-14 | Toray Industries, Inc. | Filter material for air filter and filter unit |
| JP2006263453A (en) * | 2005-02-22 | 2006-10-05 | Inoac Corp | Cushion sheet and manufacturing method for the same |
| JP2007021400A (en) * | 2005-07-19 | 2007-02-01 | Toray Ind Inc | Filter |
| WO2008120572A1 (en) | 2007-03-29 | 2008-10-09 | Toray Industries, Inc. | Filter medium and filter unit |
| WO2009041257A1 (en) | 2007-09-28 | 2009-04-02 | Toray Industries, Inc. | Filter element and filter unit |
| JP2012092457A (en) * | 2010-10-26 | 2012-05-17 | Teijin Fibers Ltd | Wet nonwoven fabric and fiber product |
| WO2015151168A1 (en) * | 2014-03-31 | 2015-10-08 | ユニチカ株式会社 | Air filter material |
| WO2018174176A1 (en) | 2017-03-24 | 2018-09-27 | 日本バイリーン株式会社 | Charged filter medium and method for manufacturing charged filter medium |
| WO2021206358A1 (en) * | 2020-04-09 | 2021-10-14 | 도레이첨단소재 주식회사 | Composite nonwoven fabric and article including same |
| CN113813698A (en) * | 2021-09-24 | 2021-12-21 | 南京玻璃纤维研究设计院有限公司 | Filter material |
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| WO2005063359A1 (en) * | 2003-12-25 | 2005-07-14 | Toray Industries, Inc. | Filter material for air filter and filter unit |
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| WO2015151168A1 (en) * | 2014-03-31 | 2015-10-08 | ユニチカ株式会社 | Air filter material |
| JPWO2015151168A1 (en) * | 2014-03-31 | 2017-04-13 | ユニチカ株式会社 | Air filter material |
| US20170151514A1 (en) * | 2014-03-31 | 2017-06-01 | Unitika Ltd. | Air filter material |
| US10610814B2 (en) | 2014-03-31 | 2020-04-07 | Unitika Ltd. | Air filter material |
| WO2018174176A1 (en) | 2017-03-24 | 2018-09-27 | 日本バイリーン株式会社 | Charged filter medium and method for manufacturing charged filter medium |
| CN110430931A (en) * | 2017-03-24 | 2019-11-08 | 日本宝翎株式会社 | The manufacturing method of charged media filter materials and charged media filter materials |
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| JPWO2018174176A1 (en) * | 2017-03-24 | 2020-01-23 | 日本バイリーン株式会社 | Charged filter medium and method for producing charged filter medium |
| WO2021206358A1 (en) * | 2020-04-09 | 2021-10-14 | 도레이첨단소재 주식회사 | Composite nonwoven fabric and article including same |
| CN113813698A (en) * | 2021-09-24 | 2021-12-21 | 南京玻璃纤维研究设计院有限公司 | Filter material |
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