JP2018171582A - Filtering material for air filter and air filter - Google Patents

Filtering material for air filter and air filter Download PDF

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JP2018171582A
JP2018171582A JP2017071869A JP2017071869A JP2018171582A JP 2018171582 A JP2018171582 A JP 2018171582A JP 2017071869 A JP2017071869 A JP 2017071869A JP 2017071869 A JP2017071869 A JP 2017071869A JP 2018171582 A JP2018171582 A JP 2018171582A
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fiber
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fibers
filter medium
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JP6941462B2 (en
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包　理
Osamu Tsutsumi
理 包
小林　誠
Makoto Kobayashi
誠 小林
陽一 大森
Yoichi Omori
陽一 大森
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Nippon Muki Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a filtering material for an air filter that has an increased PF value higher than 9.9 and has low pressure loss and high collection efficiency relative to an existing filtering material for air filters.SOLUTION: A filtering material for an air filter composed of short fiber is provided. The short fiber comprises skeleton short fiber and collecting short fiber of a smaller diameter than that of the skeleton short fiber, and these are uniformly dispersed, and an FP value expressed by the following formula (1) is 11 or more. A particle diameter of collection efficiency of a PF value=log(1-collection efficiency [%]/100)/(a pressure loss [Pa]/9.8)×(-100)(1) is 0.1-0.15 μm, and surface wind velocity is 5.3 cm/sec.SELECTED DRAWING: None

Description

本発明は、エアフィルタ用濾材に関し、特に半導体、液晶、バイオ・食品工業関係のクリーンルーム、クリーンベンチなど又はビル空調用エアフィルタ、空気清浄機用途などにおいて、気体中の微粒子を濾過するために使用されるエアフィルタ用濾材に関する。更に詳しくは、現行のエアフィルタ用濾材に比べ低圧損化・高捕集効率化したエアフィルタ用濾材に関する。   The present invention relates to a filter medium for an air filter, and particularly used for filtering fine particles in a gas in semiconductors, liquid crystals, clean rooms for bio / food industries, clean benches, etc., air filters for building air conditioning, and air cleaner applications. The present invention relates to a filter medium for an air filter. More specifically, the present invention relates to a filter medium for an air filter having a low pressure loss and a high collection efficiency as compared with the current filter medium for an air filter.

従来、空気中のサブミクロン又はミクロン単位の粒子を効率的に捕集するために、エアフィルタの捕集技術が用いられている。エアフィルタは、その対象とする粒子径や除塵効率の違いによって粗塵用フィルタ、中性能フィルタ、準高性能フィルタ、高性能フィルタ（ＨＥＰＡフィルタ、ＵＬＰＡフィルタ）などに大別される。このうち、準高性能フィルタ、高性能フィルタの規格としては、欧州規格のＥＮ１８２２がある。このＥＮ１８２２においては、最大透過粒径（ＭＰＰＳ）における捕集効率のレベルによって、Ｕ１６からＨ１０まで７段階に分類されている。その他、高性能フィルタの規格としては、米国のＩＥＳＴ−ＲＰ−ＣＣ００１、日本のＪＩＳ Ｚ ４８１２などがある。そして、準高性能フィルタ、高性能フィルタに使用される濾材としては、これらの規格をエアフィルタとして満足するものが使用されている。濾材の素材としては、不織布状のガラス繊維を用いて製造したエアフィルタ用濾材が多く使われている。主要構成物として平均繊維径が１００ｎｍ（サブミクロン）〜数１０μｍ（ミクロン）のガラス繊維が用いられており、前述の最大透過粒径（ＭＰＰＳ）が０．１〜０．２μｍの間である。   Conventionally, air filter collection techniques have been used to efficiently collect submicron or micron particles in air. Air filters are roughly classified into coarse dust filters, medium performance filters, semi-high performance filters, high performance filters (HEPA filters, ULPA filters), etc., depending on the target particle size and dust removal efficiency. Among them, the standard for semi-high performance filters and high performance filters is EN1822 of the European standard. This EN1822 is classified into seven stages from U16 to H10 according to the level of collection efficiency at the maximum transmission particle size (MPPS). Other high performance filter standards include IEST-RP-CC001 in the United States and JIS Z 4812 in Japan. And as a filter medium used for a semi-high performance filter and a high performance filter, what satisfies these specifications as an air filter is used. As a material for the filter medium, a filter medium for air filter manufactured using non-woven glass fiber is often used. Glass fibers having an average fiber diameter of 100 nm (submicron) to several tens of micrometers (microns) are used as main components, and the aforementioned maximum transmission particle diameter (MPPS) is between 0.1 and 0.2 μm.

エアフィルタ用濾材の主要な要求特性として、捕集効率以外に濾材の空気抵抗を示す圧力損失がある。濾材の捕集効率を高めるには、細径のガラス繊維の配合を増やす必要がある。しかし、同時に濾材の圧力損失が高くなる問題が発生する。高い圧力損失は、吸気ファンの運転負荷が高くなるため電力費のランニングコストがかかる問題があり、省エネの観点から濾材の低圧力損失化が求められている。特に近年、エアフィルタの多風量化に伴い、濾過性能面においてクリーンルーム、クリーンベンチ等に使用される送風機のランニングコスト低減の目的で、濾材の低圧損化・高捕集効率化の要望が強まっている。
これを解決する手段として、国際特許公開WO2009/119054号において、ガラス短繊維を主体繊維としたエアフィルタ用濾材において、構成繊維の繊維分散性が均一で、かつ、構成繊維の沈降容積を希釈濃度０．０４質量％で１２時間放置したとき４５０ｃｍ３／ｇ以上とするとともにＰＦ値を９．９以上としたエアフィルタ用濾材が提案されている。 The main required characteristics of air filter media include pressure loss that indicates the air resistance of the filter media in addition to the collection efficiency. In order to increase the collection efficiency of the filter medium, it is necessary to increase the blending of small-diameter glass fibers. However, at the same time, there arises a problem that the pressure loss of the filter medium increases. The high pressure loss has a problem that the operating load of the intake fan becomes high, and there is a problem that the running cost of the power cost is high, and the pressure loss of the filter medium is required to be reduced from the viewpoint of energy saving. In particular, with the recent increase in air volume of air filters, in order to reduce the running cost of blowers used in clean rooms, clean benches, etc. in terms of filtration performance, there is an increasing demand for low pressure loss and high collection efficiency of filter media. Yes.
As means for solving this, in International Patent Publication No. WO2009 / 119054, in the filter medium for air filters mainly composed of short glass fibers, the fiber dispersibility of the constituent fibers is uniform, and the sedimentation volume of the constituent fibers is diluted. A filter medium for an air filter has been proposed in which, when left at 0.04% by mass for 12 hours, it is 450 cm 3 / g or more and the PF value is 9.9 or more.

国際公開公報WO2009/119054号International Publication WO2009 / 119054

発明の課題は、前記提案のエアフィルタ用濾材に比べ更に低圧損化・高捕集効率化し、ＰＦ値を１１以上に高めたエアフィルタ用濾材を提供することを目的とする。   An object of the present invention is to provide a filter medium for air filter having a low pressure loss and a high collection efficiency as compared with the proposed filter medium for air filter and having a PF value increased to 11 or more.

本発明者等は前記課題を解決するべく鋭意検討の結果、濾材の構成繊維を骨格短繊維とこれより細径の捕集短繊維と有機バインダー繊維で構成してこれを均一に分散させ、均一に分散された状態でこれら骨格短繊維と捕集短繊維とを均一に分散された繊維状態の有機バインダー繊維で結着することで前記課題を解決できることを知見した。
本発明のエアフィルタ用濾材は前記知見に基づきなされたもので、請求項１に記載の通り、短繊維からなるエアフィルタ用濾材において前記短繊維を骨格短繊維とこれより細径の捕集短繊維と、有機バインダー繊維で構成しこれらが均一に分散され、下記式（１）で表されるＰＦ値が１１以上であることを特徴とする。
ＰＦ値＝log10(1-捕集効率［%］/100)/(圧力損失［Pa］/9.8)×（-100) （１）
捕集効率の粒径は0.1〜0.15μｍ、面風速は5.3cm/秒とする。
また、請求項２記載のエアフィルタ用濾材は請求項１に記載のフィルタ用濾材において、前記骨格短繊維が４５〜８０質量％、前記捕集短繊維が５〜３０質量％、前記有機バインダー繊維が１５〜２５質量％からなることを特徴とする。
また、請求項３記載のエアフィルタ用濾材は請求項１または２の何れか１項に記載のエアフィルタ用濾材において、前記骨格短繊維の繊維長が１〜５ｍｍで平均繊維径が９〜１３μｍ、前記捕集短繊維の繊維長が０．０５ｍｍ〜０．５ｍｍで平均繊維径が０．０５〜０．５μｍ、前記有機バインダー繊維の繊維長が１．０〜４．０ｍｍで平均繊維径が６．０〜１６．５μｍであることを特徴とする。
また、請求項４記載のエアフィルタ用濾材は請求項１乃至３の何れか１項に記載エアフィルタ用濾材において、前記捕集短繊維の平均繊維径が０．２μｍ以下のものが濾材の５〜１０質量％の範囲内及び／または前記短繊維の平均繊維径０．２μｍを越えるものが濾材の１０〜１５質量％の範囲内であることを特徴とする。
また、請求項５記載のエアフィルタ用濾材は請求項１乃至４の何れか１項に記載のエアフィルタ用濾材において、前記骨格短繊維及び捕集短繊維がガラス短繊維であることを特徴とする。
また、請求項６記載のエアフィルタ用濾材は請求項１乃至５記載の何れか１項に記載のエアフィルタ用濾材において、前記有機バインダー繊維がポリビニルアルコール繊維であることを特徴とする。
また、本発明のエアフィルタは、請求項７記載の通り、前記請求項１乃至６の何れか１項に記載のエアフィルタ用濾材を用いたことを特徴とする。 As a result of intensive studies to solve the above problems, the present inventors constituted the constituent fibers of the filter medium with skeleton short fibers, finer collection short fibers and organic binder fibers, and uniformly dispersed them. It has been found that the above problem can be solved by binding these short skeleton fibers and the collected short fibers with the uniformly dispersed organic binder fibers in a dispersed state.
The filter material for an air filter of the present invention has been made on the basis of the above knowledge. As described in claim 1, in the filter material for an air filter made of short fibers, the short fibers are made of skeletal short fibers and a smaller collection diameter. It comprises fibers and organic binder fibers, these are uniformly dispersed, and the PF value represented by the following formula (1) is 11 or more.
PF value = log 10 (1-capture efficiency [%] / 100) / (pressure loss [Pa] /9.8) × (-100) (1)
The particle size of the collection efficiency is 0.1 to 0.15 μm, and the surface wind speed is 5.3 cm / second.
The filter medium for an air filter according to claim 2 is the filter medium for filter according to claim 1, wherein the skeleton short fiber is 45 to 80% by mass, the collecting short fiber is 5 to 30% by mass, and the organic binder fiber. Is composed of 15 to 25% by mass.
The air filter medium according to claim 3 is the air filter medium according to any one of claims 1 and 2, wherein the skeletal short fibers have a fiber length of 1 to 5 mm and an average fiber diameter of 9 to 13 µm. The fiber length of the collected short fibers is 0.05 mm to 0.5 mm and the average fiber diameter is 0.05 to 0.5 μm. The fiber length of the organic binder fibers is 1.0 to 4.0 mm and the average fiber diameter is It is 6.0 to 16.5 μm.
The air filter medium according to claim 4 is the air filter medium according to any one of claims 1 to 3, wherein the collection fiber has an average fiber diameter of 0.2 μm or less. The short fiber has an average fiber diameter exceeding 0.2 μm within the range of 10 to 15% by mass and within the range of 10 to 15% by mass of the filter medium.
The filter medium for an air filter according to claim 5 is the filter medium for an air filter according to any one of claims 1 to 4, wherein the skeleton short fibers and the collection short fibers are short glass fibers. To do.
The air filter medium according to claim 6 is the air filter medium according to any one of claims 1 to 5, wherein the organic binder fiber is a polyvinyl alcohol fiber.
The air filter of the present invention is characterized in that, as described in claim 7, the air filter medium according to any one of claims 1 to 6 is used.

本発明のエアフィルタ用濾材においては、中性能エアフィルタ、準ＨＥＰＡフィルタ、ＨＥＰＡフィルタ等のグレードを問わず、ＰＦ値が１１以上の低圧損化・高捕集効率化したエアフィルタ用濾材並びにエアフィルタが得られる。   In the filter medium for air filter of the present invention, regardless of the grade of medium performance air filter, quasi-HEPA filter, HEPA filter, etc., the filter medium for air filter and the air filter having a low PF value and high collection efficiency having a PF value of 11 or more and air A filter is obtained.

エアフィルタ用濾材とそれを用いたエアフィルタの実施例及び比較例についての構成と特性を纏めた表（中性能）。The table | surface (medium performance) which put together the structure and characteristic about the Example and comparative example of a filter medium for air filters, and an air filter using the same. エアフィルタ用濾材とそれを用いたエアフィルタの実施例及び比較例についての構成と特性を纏めた表（準ＨＥＰＡ）。The table | surface (quasi-HEPA) which put together the structure and characteristic about the Example and comparative example of a filter medium for air filters, and an air filter using the same. エアフィルタ用濾材とそれを用いたエアフィルタの実施例及び比較例についての構成と特性を纏めた表（ＨＥＰＡ）。The table | surface (HEPA) which put together the structure and characteristic about the Example and comparative example of a filter medium for air filters, and an air filter using the same.

本発明のエアフィルタ用濾材は濾材の構成繊維を骨格短繊維とこれより細径の捕集短繊維と有機繊維バインダーで構成してこれを均一に分散させ、均一に分散された状態でこれら骨格短繊維と捕集短繊維とを均一に分散された繊維状態の有機繊維バインダーで結着するようにしたため、ＦＰ値が１１以上であることが達成される。   The filter medium for an air filter of the present invention is composed of a short skeleton fiber, a collecting fiber having a smaller diameter than this, and an organic fiber binder to uniformly disperse the skeleton short fibers, and these skeletons in a uniformly dispersed state. Since the short fibers and the collected short fibers are bound by the organic fiber binder in a uniformly dispersed fiber state, it is achieved that the FP value is 11 or more.

前記捕集短繊維としてはガラス繊維、セラミック繊維、炭素繊維、カーボンナノチューブ、カーボンナノファイバ、金属繊維等の無機繊維や、セルロース、ポリテトラフルオロエチレン、ポリエチレンテレフタレート、ポリエステル、ポリプロピレン、ポリオレフィン、ポリフッ化ビニリデン、ポリエチレン、ポリアクリロルニトリル。アクリル、ナイロン、ポリアミド、ポリビニルアルコール、ポリウレタン等の有機繊維が挙げられる。
但し、耐熱性や経済性を考慮するとボロシリケートガラス繊維のようなガラス短繊維の使用が好ましい。 Examples of the collection short fibers include glass fibers, ceramic fibers, carbon fibers, carbon nanotubes, carbon nanofibers, metal fibers, and the like, cellulose, polytetrafluoroethylene, polyethylene terephthalate, polyester, polypropylene, polyolefins, and polyvinylidene fluoride. , Polyethylene, polyacrylonitrile. Organic fibers such as acrylic, nylon, polyamide, polyvinyl alcohol, and polyurethane are listed.
However, in consideration of heat resistance and economy, it is preferable to use short glass fibers such as borosilicate glass fibers.

また、前記骨格短繊維としては前記捕集短繊維と同様の無機繊維や有機繊維が使用される。また、前記捕集短繊維と同様にボロシリケートガラス繊維のようなガラス短繊維の使用が好ましい。   Further, as the skeleton short fibers, the same inorganic fibers and organic fibers as the collection short fibers are used. In addition, it is preferable to use short glass fibers such as borosilicate glass fibers in the same manner as the collected short fibers.

前記有機バインダー繊維としてはポリビニルアルコール（ＰＶＡ）、ビニロン、ポリエステル等が挙げられる。
但し、低温で乾燥した時に、バインダ繊維の繊維形状を保て、繊維状結着しやすいという観点からポリビニルアルコール（ＰＶＡ）のような有機繊維の使用が好ましい。
尚、有機繊維バインダーが溶融して膜化してしまうと圧力損失増加の原因となるので余り低融点のものの使用は好ましくなく、また、製造工程における抄紙工程に続く乾燥工程の乾燥温度を有機繊維バインダーの融点以下にする必要がある。 Examples of the organic binder fiber include polyvinyl alcohol (PVA), vinylon, and polyester.
However, it is preferable to use an organic fiber such as polyvinyl alcohol (PVA) from the viewpoint of maintaining the fiber shape of the binder fiber and facilitating the fiber binding when dried at a low temperature.
In addition, if the organic fiber binder melts and becomes a film, it causes an increase in pressure loss, so it is not preferable to use a material having a very low melting point, and the drying temperature in the drying process following the paper making process in the manufacturing process is not preferred. It is necessary to make it below the melting point.

濾材を構成する前記骨格短繊維と、前記捕集短繊維と有機バインダー繊維の配合は、前記骨格短繊維が４５〜８０質量％、前記捕集短繊維が５〜３０質量％、前記有機バインダー繊維が１５〜２５質量％とするのが好ましい。   The composition of the skeleton short fibers constituting the filter medium, the collection short fibers, and the organic binder fibers is 45 to 80 mass% for the skeleton short fibers, 5 to 30 mass% for the collection short fibers, and the organic binder fibers. Is preferably 15 to 25% by mass.

また、前記骨格短繊維は繊維長が１〜５ｍｍで平均繊維径が９〜１３μｍ前記捕集短繊維は繊維長が０．０５ｍｍ〜０．５ｍｍで平均繊維径が０．０５〜０．５μｍであることが好ましい。
また、前記有機バインダー繊維は、繊維長が１．０〜４．０ｍｍで平均繊維径が６．０〜１６．５μｍであることが好ましい The skeletal short fiber has a fiber length of 1 to 5 mm and an average fiber diameter of 9 to 13 μm. The collected short fiber has a fiber length of 0.05 mm to 0.5 mm and an average fiber diameter of 0.05 to 0.5 μm. Preferably there is.
The organic binder fiber preferably has a fiber length of 1.0 to 4.0 mm and an average fiber diameter of 6.0 to 16.5 μm.

また、前記捕集短繊維の平均繊維径が０．２μｍ以下のものが濾材の５〜１０質量％の範囲内にするのが圧力損失の増加を押さえる観点から好ましく、前記短繊維の平均繊維径０．２μｍを越えるものが濾材の１０〜１５質量％の範囲内にするのが捕集効率の低下を押さえる観点から好ましい。   Moreover, it is preferable from the viewpoint of suppressing an increase in pressure loss that the collected short fibers have an average fiber diameter of 0.2 μm or less in the range of 5 to 10% by mass of the filter medium, and the average fiber diameter of the short fibers It is preferable from the viewpoint of suppressing the reduction of the collection efficiency that the thickness exceeds 0.2 μm is within the range of 10 to 15% by mass of the filter medium.

前記濾材の製造例を説明すれば、例えば、捕集短繊維と、骨格短繊維と、有機バインダー繊維をミキサーで離解し、離解後の原料を水で希釈し、手抄装置を用いて抄紙することによって湿紙を得、これをロールドライヤーで乾燥し、濾材を得る。
尚、この製造において、前記ミキサーの回転数が速い場合は、捕集繊維の骨格繊維への分散が良くなり、高いPF値が得られるが、繊維が切れて繊維長さが短くなるので、短寿命の懸念のある、へたった濾材材しか得られない。また、回転数が遅い場合は、繊維長さが保たれるので、長寿命を期待できる嵩高な濾材が得られるが、捕集繊維の骨格繊維への分散が悪くなり、高いPF値が得られない。そこで、鋭意検討した結果、ミキシング条件等を検討すれば、例えば回転数が６，０００ｒｍｐ程度だと、捕集繊維の骨格繊維への分散が良くでき、高いPF値が得られると共に、繊維長さも調整でき、長寿命が期待できる嵩高の濾材を作成できることを見い出した。
また、ロールドライヤーでの乾燥温度は、有機バインダー繊維をその繊維形状を保持した状態で捕集短繊維と骨格短繊維を結着できる程度の温度とすることが好ましい。 Explaining the production example of the filter medium, for example, the collection staple fiber, the skeleton short fiber, and the organic binder fiber are disaggregated with a mixer, the disaggregated raw material is diluted with water, and paper is made using a hand-pulling apparatus. Thus, a wet paper is obtained and dried with a roll dryer to obtain a filter medium.
In this production, when the rotational speed of the mixer is high, the dispersion of the collected fibers into the skeletal fiber is improved and a high PF value is obtained, but the fiber is cut and the fiber length is shortened. Only a filter medium with a concern about the lifetime can be obtained. In addition, when the rotation speed is slow, the fiber length is maintained, so that a bulky filter medium that can be expected to have a long life can be obtained, but the dispersion of the collected fibers into the skeletal fiber becomes poor, and a high PF value is obtained. Absent. Therefore, as a result of diligent investigation, if mixing conditions are examined, for example, if the rotational speed is about 6,000 rpm, the dispersion of the collected fibers to the skeleton fibers can be improved, and a high PF value can be obtained, and the fiber length can also be increased. It was found that a bulky filter medium that can be adjusted and expected to have a long life can be produced.
The drying temperature in the roll dryer is preferably set to a temperature at which the collected short fibers and the skeleton short fibers can be bound in a state where the fiber shape of the organic binder fibers is maintained.

実施例１
捕集短繊維として繊維長０．２８４ｍｍ、平均繊維径０．２８４μｍのガラス短繊維（ジョンズマンビル社製 Ｃｏｄｅ１０４）１０質量％、骨格短繊維として繊維長４ｍｍ以下、平均繊維径１０．５μｍのガラス短繊維（ニットーボー社製 チョップドスラント）７０質量％、有機バインダー繊維として平均繊維径７μｍのＰＶＡ繊維（クラレ社製 ＶＰＢ０４１）２０質量％をミキサー（６，０００ｒｐｍ）で離解した。この離解された分散物は、均一な分散状態であった。次いで、離解後の原料を水で濃度０．１質量％まで希釈し、手抄装置を用いて抄紙することによって湿紙を得た。これを８０℃のロールドライヤーで乾燥し、濾材を得た。 Example 1
Glass having a fiber length of 0.284 mm and an average fiber diameter of 0.284 μm as a collection short fiber (Code 104 manufactured by Johns Manville) 10% by mass, and a skeleton short fiber having a fiber length of 4 mm or less and an average fiber diameter of 10.5 μm 70% by mass of short fibers (chopped slant manufactured by Nitto Bo) and 20% by mass of PVA fibers (VPB041 manufactured by Kuraray Co., Ltd.) having an average fiber diameter of 7 μm as organic binder fibers were disaggregated with a mixer (6,000 rpm). This disaggregated dispersion was in a uniform dispersion state. Next, a wet paper was obtained by diluting the raw material after disaggregation with water to a concentration of 0.1% by mass and making paper using a hand-making apparatus. This was dried with a roll dryer at 80 ° C. to obtain a filter medium.

実施例２
捕集短繊維として繊維長０．１７５ｍｍ、平均繊維径０．１７５μｍのガラス短繊維（ジョンズマンビル社製 Ｃｏｄｅ９０）５質量％、骨格短繊維として繊維長４ｍｍ、平均繊維径１０．５μｍのガラス短繊維（ニットーボー社製 チョップドスラント）７５質量％、有機バインダー繊維として平均繊維径７μｍのＰＶＡ繊維（クラレ社製 ＶＰＢ０４１）２０質量％をミキサー（６，０００ｒｐｍ）で離解した。この離解された分散物は、均一な分散状態であった。次いで、離解後の原料を水で濃度０．１質量％まで希釈し、手抄装置を用いて抄紙することによって湿紙を得た。これを８０℃のロールドライヤーで乾燥し、濾材を得た。 Example 2
5% by mass of a short glass fiber (Code 90 manufactured by Johnsmanville) having a fiber length of 0.175 mm and an average fiber diameter of 0.175 μm as a collecting short fiber, and a short glass having a fiber length of 4 mm and an average fiber diameter of 10.5 μm as a skeleton short fiber 75% by mass of fibers (Nittobo chopped slant) and 20% by mass of PVA fibers (VPB041 made by Kuraray Co., Ltd.) having an average fiber diameter of 7 μm as organic binder fibers were disaggregated with a mixer (6,000 rpm). This disaggregated dispersion was in a uniform dispersion state. Next, a wet paper was obtained by diluting the raw material after disaggregation with water to a concentration of 0.1% by mass and making paper using a hand-making apparatus. This was dried with a roll dryer at 80 ° C. to obtain a filter medium.

実施例３
捕集短繊維として繊維長０．２８４ｍｍ、平均繊維径０．２８４μｍのガラス短繊維（ジョンズマンビル社製 Ｃｏｄｅ１０４）１０質量％、骨格短繊維として繊維長４ｍｍ以下、平均繊維径１０．５μｍのガラス短繊維（ニットーボー社製 チョップドスラント）７０質量％、有機バインダー繊維として平均繊維径７μｍのＰＶＡ繊維（クラレ社製 ＶＰＢ０４１）２０質量％をミキサー（６，０００ｒｐｍ）で離解した。この離解された分散物は、均一な分散状態であった。次いで、離解後の原料を水で濃度０．１質量％まで希釈し、手抄装置を用いて抄紙することによって湿紙を得た。これを１２０℃のロールドライヤーで乾燥し、濾材を得た。 Example 3
Glass having a fiber length of 0.284 mm and an average fiber diameter of 0.284 μm as a collection short fiber (Code 104 manufactured by Johns Manville) 10% by mass, and a skeleton short fiber having a fiber length of 4 mm or less and an average fiber diameter of 10.5 μm 70% by mass of short fibers (chopped slant manufactured by Nitto Bo) and 20% by mass of PVA fibers (VPB041 manufactured by Kuraray Co., Ltd.) having an average fiber diameter of 7 μm as organic binder fibers were disaggregated with a mixer (6,000 rpm). This disaggregated dispersion was in a uniform dispersion state. Next, a wet paper was obtained by diluting the raw material after disaggregation with water to a concentration of 0.1% by mass and making paper using a hand-making apparatus. This was dried with a roll dryer at 120 ° C. to obtain a filter medium.

比較例１
捕集短繊維として繊維長０．２８４ｍｍ、平均繊維径０．２８４μｍのガラス短繊維（ジョンズマンビル社製 Ｃｏｄｅ１０４）１０質量％、骨格短繊維として繊維長４ｍｍ以下、平均繊維径１０．５μｍのガラス短繊維（ニットーボー社製 チョップドスラント）７０質量％、有機バインダー繊維として平均繊維径７μｍのＰＶＡ繊維（クラレ社製 ＶＰＢ０４１）２０質量％をミキサー（６，０００ｒｐｍ）で離解した。この離解された分散物は、均一な分散状態であった。次いで、離解後の原料を水で濃度０．１質量％まで希釈し、手抄装置を用いて抄紙することによって湿紙を得た。これを１５０℃のロールドライヤーで乾燥し、濾材を得た。 Comparative Example 1
Glass having a fiber length of 0.284 mm and an average fiber diameter of 0.284 μm as a collection short fiber (Code 104 manufactured by Johns Manville) 10% by mass, and a skeleton short fiber having a fiber length of 4 mm or less and an average fiber diameter of 10.5 μm 70% by mass of short fibers (chopped slant manufactured by Nitto Bo) and 20% by mass of PVA fibers (VPB041 manufactured by Kuraray Co., Ltd.) having an average fiber diameter of 7 μm as organic binder fibers were disaggregated with a mixer (6,000 rpm). This disaggregated dispersion was in a uniform dispersion state. Next, a wet paper was obtained by diluting the raw material after disaggregation with water to a concentration of 0.1% by mass and making paper using a hand-making apparatus. This was dried with a roll dryer at 150 ° C. to obtain a filter medium.

比較例２
捕集短繊維として繊維長０．２８４ｍｍ、平均繊維径０．２８４μｍのガラス短繊維（ジョンズマンビル社製 Ｃｏｄｅ１０４）５質量％、骨格短繊維として繊維長４ｍｍ以下、平均繊維径１０．５μｍのガラス短繊維（ニットーボー社製 チョップドスラント）７５質量％、有機バインダー繊維として平均繊維径７μｍのＰＶＡ繊維（クラレ社製 ＶＰＢ０４１）２０質量％をミキサー（６，０００ｒｐｍ）で離解した。この離解された分散物は、均一な分散状態であった。次いで、離解後の原料を水で濃度０．１質量％まで希釈し、手抄装置を用いて抄紙することによって湿紙を得た。これを８０℃のロールドライヤーで乾燥し、濾材を得た。 Comparative Example 2
5% by mass of short glass fibers (Code 104 manufactured by Johns Manville) having a fiber length of 0.284 mm and an average fiber diameter of 0.284 μm as collection short fibers, and a glass having an average fiber diameter of 10.5 μm and a fiber length of 4 mm or less. 75% by mass of short fibers (chopped slant manufactured by Nitto Bo) and 20% by mass of PVA fibers (VPB041 manufactured by Kuraray Co., Ltd.) having an average fiber diameter of 7 μm as organic binder fibers were disaggregated with a mixer (6,000 rpm). This disaggregated dispersion was in a uniform dispersion state. Next, a wet paper was obtained by diluting the raw material after disaggregation with water to a concentration of 0.1% by mass and making paper using a hand-making apparatus. This was dried with a roll dryer at 80 ° C. to obtain a filter medium.

次ぎに、前記実施例１乃至３及び比較例例１及び２のエアフィルタ用濾材について次ぎのようにして捕集効率（％）と圧力損失（Ｐａ）を求め、それらからＰＦ値を求め図１に示した。
捕集効率
０．１〜０．１５μｍのＰＡＯ粒子を含む気流を濾過速度５．３ｃｍ/秒で通過させ、ＪＩＳ Ｚ８８１３に準じた光散乱積算法により、通過前後の粉じん濃度を測定し、次式にて求める。
圧力損失
捕集効率の測定と並行して風速５．３ｃｍ/秒の気流を通過させた時の上下流の静圧差を測定し、それを圧力損失とする。 Next, the trapping efficiency (%) and the pressure loss (Pa) are determined for the air filter media of Examples 1 to 3 and Comparative Examples 1 and 2 as follows, and the PF value is determined from them. It was shown to.
The collection efficiency is measured by measuring the dust concentration before and after passing by the light scattering integration method according to JIS Z8813 by passing an air stream containing PAO particles of 0.1 to 0.15 μm at a filtration rate of 5.3 cm / sec. Ask for.
Pressure loss In parallel with the measurement of the collection efficiency, the static pressure difference between the upstream and downstream when an air flow with a wind speed of 5.3 cm / second is passed is measured, and this is taken as the pressure loss.

次ぎに、前記濾材を用い、折幅１２５ｍｍ、山数１０４山、風量５６ｍ３／ｍｉｎの中性能フィルタ（６１０×６１０×１５０ｍｍ）を作成した。
得られた中性能フィルタについて以下のようにして捕集効率（％）と圧力損失（Ｐａ）を求め、それらからＰＦ値を求め図１に示した。 Next, a medium performance filter (610 × 610 × 150 mm) having a folding width of 125 mm, a mountain number of 104, and an air volume of 56 m 3 / min was prepared using the filter medium.
With respect to the obtained medium performance filter, the collection efficiency (%) and the pressure loss (Pa) were obtained as follows, and the PF value was obtained therefrom and shown in FIG.

実施例４
捕集短繊維として繊維長０．１７５ｍｍ、平均繊維径０．１７５μｍのガラス短繊維（ジョンズマンビル社製 Ｃｏｄｅ９０）１０質量％、骨格短繊維として繊維長４ｍｍ、平均繊維径１０．５μｍのガラス短繊維（ニットーボー社製 チョップドスラント）７０質量％、有機バインダー繊維として平均繊維径７μｍのＰＶＡ繊維（クラレ社製 ＶＰＢ０４１）２０質量％をミキサー（６，０００ｒｐｍ）で離解した。この離解された分散物は、均一な分散状態であった。次いで、離解後の原料を水で濃度０．１質量％まで希釈し、手抄装置を用いて抄紙することによって湿紙を得た。これを８０℃のロールドライヤーで乾燥し、濾材を得た。 Example 4
10% by mass of short glass fibers (Code 90 manufactured by Johnsmanville Co., Ltd.) having a fiber length of 0.175 mm and an average fiber diameter of 0.175 μm as collection short fibers, and a short glass having a fiber length of 4 mm and an average fiber diameter of 10.5 μm as skeleton short fibers 70% by mass of fibers (Nittobo chopped slant) and 20% by mass of PVA fibers (VPB041 made by Kuraray Co., Ltd.) having an average fiber diameter of 7 μm as organic binder fibers were disaggregated with a mixer (6,000 rpm). This disaggregated dispersion was in a uniform dispersion state. Next, a wet paper was obtained by diluting the raw material after disaggregation with water to a concentration of 0.1% by mass and making paper using a hand-making apparatus. This was dried with a roll dryer at 80 ° C. to obtain a filter medium.

実施例５
捕集短繊維として繊維長０．１７５ｍｍ、平均繊維径０．１７５μｍのボロシリケートガラス短繊維（ジョンズマンビル社製 Ｃｏｄｅ９０）５質量％と、捕集短繊維として繊維長０．２８４ｍｍ、平均繊維径０．２８４μｍのガラス短繊維（ジョンズマンビル社製 Ｃｏｄｅ１０４）１０質量％、骨格短繊維として繊維長４ｍｍ、平均繊維径１０．５μｍのガラス短繊維（ニットーボー社製 チョップドスラント）６５質量％、有機バインダー繊維として平均繊維径７μｍのＰＶＡ繊維（クラレ社製 ＶＰＢ０４１）２０質量％をミキサー（６，０００ｒｐｍ）で離解した。この離解された分散物は、均一な分散状態であった。次いで、離解後の原料を水で濃度０．１質量％まで希釈し、手抄装置を用いて抄紙することによって湿紙を得た。これを８０℃のロールドライヤーで乾燥し、濾材を得た。 Example 5
5% by mass of borosilicate glass short fibers (Code 90 manufactured by Johns Manville) having a fiber length of 0.175 mm and an average fiber diameter of 0.175 μm as collection short fibers, and a fiber length of 0.284 mm and an average fiber diameter as collection short fibers 0.284 μm short glass fiber (Code 104, manufactured by Johns Manville) 10% by mass, short glass fiber having a fiber length of 4 mm and an average fiber diameter of 10.5 μm (chopped slant) 65% by mass, organic binder As a fiber, 20% by mass of PVA fiber (VPB041 manufactured by Kuraray Co., Ltd.) having an average fiber diameter of 7 μm was disaggregated with a mixer (6,000 rpm). This disaggregated dispersion was in a uniform dispersion state. Next, a wet paper was obtained by diluting the raw material after disaggregation with water to a concentration of 0.1% by mass and making paper using a hand-making apparatus. This was dried with a roll dryer at 80 ° C. to obtain a filter medium.

実施例６
捕集短繊維として繊維長０．１７５ｍｍ、平均繊維径０．１７５μｍのガラス短繊維（ジョンズマンビル社製 Ｃｏｄｅ９０）５質量％と、捕集短繊維として繊維長０．２８４ｍｍ、平均繊維径０．２８４μｍのガラス短繊維（ジョンズマンビル社製 Ｃｏｄｅ１０４）１０質量％、骨格短繊維として繊維長４ｍｍ、平均繊維径１０．５μｍのガラス短繊維（ニットーボー社製 チョップドスラント）６５質量％、有機バインダー繊維として平均繊維径７μｍのＰＶＡ繊維（クラレ社製 ＶＰＢ０４１）２０質量％をミキサー（６，０００ｒｐｍ）で離解した。この離解された分散物は、均一な分散状態であった。次いで、離解後の原料を水で濃度０．１質量％まで希釈し、手抄装置を用いて抄紙することによって湿紙を得た。これを１２０℃のロールドライヤーで乾燥し、濾材を得た。 Example 6
5% by mass of a short glass fiber (Code 90 manufactured by Johns Manville) having a fiber length of 0.175 mm and an average fiber diameter of 0.175 μm as a collecting short fiber, and a fiber length of 0.284 mm and an average fiber diameter of 0. 10% by mass of 284 μm short glass fiber (Code 104 manufactured by Johnsmanville), 4% fiber length as skeleton short fiber, 65% by mass glass short fiber (chopped slant manufactured by Nitteau-Bo Co.) having an average fiber diameter of 10.5 μm, and organic binder fiber 20% by mass of PVA fiber (VPB041 manufactured by Kuraray Co., Ltd.) having an average fiber diameter of 7 μm was disaggregated with a mixer (6,000 rpm). This disaggregated dispersion was in a uniform dispersion state. Next, a wet paper was obtained by diluting the raw material after disaggregation with water to a concentration of 0.1% by mass and making paper using a hand-making apparatus. This was dried with a roll dryer at 120 ° C. to obtain a filter medium.

実施例７
捕集短繊維として繊維長０．２８４ｍｍ、平均繊維径０．２８４μｍのガラス短繊維（ジョンズマンビル社製 Ｃｏｄｅ１０４）２０質量％、骨格短繊維として繊維長４ｍｍ以下、平均繊維径１０．５μｍのガラス短繊維（ニットーボー社製 チョップドスラント）６０質量％、有機バインダー繊維として平均繊維径７μｍのＰＶＡ繊維（クラレ社製 ＶＰＢ０４１）２０質量％をミキサー（６，０００ｒｐｍ）で離解した。この離解された分散物は、均一な分散状態であった。次いで、離解後の原料を水で濃度０．１質量％まで希釈し、手抄装置を用いて抄紙することによって湿紙を得た。これを８０℃のロールドライヤーで乾燥し、濾材を得た。 Example 7
Glass having a fiber length of 0.284 mm and an average fiber diameter of 0.284 μm as a collecting short fiber (Code 104 manufactured by Johns Manville) 20% by mass, and a skeleton short fiber having a fiber length of 4 mm or less and an average fiber diameter of 10.5 μm 60% by mass of short fibers (chopped slant manufactured by Nitto Bo) and 20% by mass of PVA fibers (VPB041 manufactured by Kuraray Co., Ltd.) having an average fiber diameter of 7 μm as organic binder fibers were disaggregated with a mixer (6,000 rpm). This disaggregated dispersion was in a uniform dispersion state. Next, a wet paper was obtained by diluting the raw material after disaggregation with water to a concentration of 0.1% by mass and making paper using a hand-making apparatus. This was dried with a roll dryer at 80 ° C. to obtain a filter medium.

実施例８
捕集短繊維として繊維長０．１９５ｍｍ、平均繊維径０．１９５μｍのＰＥＴ短繊維５質量％と、繊維長０．３９５ｍｍ、平均繊維径０．３９５μｍのＰＥＴ短繊維１０質量％、骨格短繊維として繊維長５ｍｍ以下、平均繊維径１２．５μｍのＰＥＴ短繊維（帝人社製 ＴＴ０４ＰＮ）６５質量％、有機バインダー繊維として平均繊維径７μｍのＰＶＡ繊維（クラレ社製 ＶＰＢ０４１）２０質量％をミキサー（６，０００ｒｐｍ）で離解した。この離解された分散物は、均一な分散状態であった。次いで、離解後の原料を水で濃度０．１質量％まで希釈し、手抄装置を用いて抄紙することによって湿紙を得た。これを８０℃のロールドライヤーで乾燥し、濾材を得た。 Example 8
As collection short fibers, 5% by mass of PET short fibers having a fiber length of 0.195 mm and an average fiber diameter of 0.195 μm, and 10% by mass of PET short fibers having a fiber length of 0.395 mm and an average fiber diameter of 0.395 μm, as skeleton short fibers 65% by mass of PET short fiber (TT04PN manufactured by Teijin Ltd.) having a fiber length of 5 mm or less and an average fiber diameter of 12.5 μm, and 20% by mass of PVA fiber (VPB041 manufactured by Kuraray Co., Ltd.) having an average fiber diameter of 7 μm as an organic binder fiber (6, 000 rpm). This disaggregated dispersion was in a uniform dispersion state. Next, a wet paper was obtained by diluting the raw material after disaggregation with water to a concentration of 0.1% by mass and making paper using a hand-making apparatus. This was dried with a roll dryer at 80 ° C. to obtain a filter medium.

比較例３
捕集短繊維として繊維長０．１７５ｍｍ、平均繊維径０．１７５μｍのガラス短繊維（ジョンズマンビル社製 Ｃｏｄｅ９０）５質量％と、捕集短繊維として繊維長０．２８４ｍｍ、平均繊維径０．２８４μｍのガラス短繊維（ジョンズマンビル社製 Ｃｏｄｅ１０４）１０質量％、骨格短繊維として繊維長４ｍｍ、平均繊維径１０．５μｍのボロシリケートガラス短繊維（ニットーボー社製 チョップドスラント）６５質量％、有機バインダー繊維として平均繊維径７μｍのＰＶＡ繊維（クラレ社製 ＶＰＢ０４１）２０質量％をミキサー（６，０００ｒｐｍ）で離解した。この離解された分散物は、均一な分散状態であった。次いで、離解後の原料を水で濃度０．１質量％まで希釈し、手抄装置を用いて抄紙することによって湿紙を得た。これを１５０℃のロールドライヤーで乾燥し、濾材を得た。 Comparative Example 3
5% by mass of a short glass fiber (Code 90 manufactured by Johns Manville) having a fiber length of 0.175 mm and an average fiber diameter of 0.175 μm as a collecting short fiber, and a fiber length of 0.284 mm and an average fiber diameter of 0. 284 μm short glass fiber (Code 104, manufactured by Johns Manville) 10% by mass, skeletal short fiber borosilicate glass short fiber (4 mm, average fiber diameter 10.5 μm, chopped slant) 65% by mass, organic binder As a fiber, 20% by mass of PVA fiber (VPB041 manufactured by Kuraray Co., Ltd.) having an average fiber diameter of 7 μm was disaggregated with a mixer (6,000 rpm). This disaggregated dispersion was in a uniform dispersion state. Next, a wet paper was obtained by diluting the raw material after disaggregation with water to a concentration of 0.1% by mass and making paper using a hand-making apparatus. This was dried with a roll dryer at 150 ° C. to obtain a filter medium.

次ぎに、前記実施例４乃至８及び比較例例３のエアフィルタ用濾材について上記と同様にして捕集効率（％）と圧力損失（Ｐａ）を求め、それらからＰＦ値を求め図２に示した。   Next, in the same manner as described above, the collection efficiency (%) and the pressure loss (Pa) were obtained for the air filter media of Examples 4 to 8 and Comparative Example 3, and the PF value was obtained therefrom and shown in FIG. It was.

次ぎに、前記濾材を用い、折幅６５ｍｍ、山数２００山、風量１７ｍ３／ｍｉｎの準ＰＥＰＡ（６１０×６１０×７５）を作成した。
得られた中性能フィルタについて上記と同様にして捕集効率（％）と圧力損失（Ｐａ）を求め、それらからＰＦ値を求め図２に示した。 Next, a quasi-PEPA (610 × 610 × 75) having a folding width of 65 mm, a mountain number of 200, and an air volume of 17 m 3 / min was prepared using the filter medium.
With respect to the obtained medium performance filter, the collection efficiency (%) and the pressure loss (Pa) were obtained in the same manner as described above, and the PF value was obtained therefrom and shown in FIG.

実施例９
捕集短繊維として繊維長０．１７５ｍｍ、平均繊維径０．１７５μｍのガラス短繊維（ジョンズマンビル社製 Ｃｏｄｅ９０）１０質量％と、捕集短繊維として繊維長０．２８４ｍｍ、平均繊維径０．２８４μｍのガラス短繊維（ジョンズマンビル社製 Ｃｏｄｅ１０４）１０質量％、骨格短繊維として繊維長４ｍｍ、平均繊維径１０．５μｍのガラス短繊維（ニットーボー社製 チョップドスラント）６０質量％、有機バインダー繊維として平均繊維径７μｍのＰＶＡ繊維（クラレ社製 ＶＰＢ０４１）２０質量％をミキサー（６，０００ｒｐｍ）で離解した。この離解された分散物は、均一な分散状態であった。次いで、離解後の原料を水で濃度０．１質量％まで希釈し、手抄装置を用いて抄紙することによって湿紙を得た。これを８０℃のロールドライヤーで乾燥し、濾材を得た。 Example 9
10% by mass of a short glass fiber (Code 90 manufactured by Johns Manville) having a fiber length of 0.175 mm and an average fiber diameter of 0.175 μm as a collecting short fiber, and a fiber length of 0.284 mm and an average fiber diameter of 0.84 as a collecting short fiber. 10% by mass of 284 μm short glass fiber (Code 104 manufactured by Johns Manville), 4% fiber length as a skeleton short fiber, 60% by mass short glass fiber (chopped slant manufactured by Nittobo) as an organic binder fiber 20% by mass of PVA fiber (VPB041 manufactured by Kuraray Co., Ltd.) having an average fiber diameter of 7 μm was disaggregated with a mixer (6,000 rpm). This disaggregated dispersion was in a uniform dispersion state. Next, a wet paper was obtained by diluting the raw material after disaggregation with water to a concentration of 0.1% by mass and making paper using a hand-making apparatus. This was dried with a roll dryer at 80 ° C. to obtain a filter medium.

実施例１０
捕集短繊維として繊維長０．１７５ｍｍ、平均繊維径０．１７５μｍのガラス短繊維（ジョンズマンビル社製 Ｃｏｄｅ９０）５質量％と、捕集短繊維として繊維長０．２８４ｍｍ、平均繊維径０．２８４μｍのガラス短繊維（ジョンズマンビル社製 Ｃｏｄｅ１０４）１５質量％、骨格短繊維として繊維長４ｍｍ、平均繊維径１０．５μｍのガラス短繊維（ニットーボー社製 チョップドスラント）６０質量％、有機バインダー繊維として平均繊維径７μｍのＰＶＡ繊維（クラレ社製 ＶＰＢ０４１）２０質量％をミキサー（６，０００ｒｐｍ）で離解した。この離解された分散物は、均一な分散状態であった。次いで、離解後の原料を水で濃度０．１質量％まで希釈し、手抄装置を用いて抄紙することによって湿紙を得た。これを８０℃のロールドライヤーで乾燥し、濾材を得た。 Example 10
5% by mass of a short glass fiber (Code 90 manufactured by Johns Manville) having a fiber length of 0.175 mm and an average fiber diameter of 0.175 μm as a collecting short fiber, and a fiber length of 0.284 mm and an average fiber diameter of 0. 15% by mass of 284 μm short glass fiber (Code 104 manufactured by Johnsmanville), 4% fiber length as skeleton short fiber, 60% by mass glass short fiber (chopped slant manufactured by Nitteau-Bo Co.) having an average fiber diameter of 10.5 μm, and organic binder fiber 20% by mass of PVA fiber (VPB041 manufactured by Kuraray Co., Ltd.) having an average fiber diameter of 7 μm was disaggregated with a mixer (6,000 rpm). This disaggregated dispersion was in a uniform dispersion state. Next, a wet paper was obtained by diluting the raw material after disaggregation with water to a concentration of 0.1% by mass and making paper using a hand-making apparatus. This was dried with a roll dryer at 80 ° C. to obtain a filter medium.

実施例１１
捕集短繊維として繊維長０．２８４ｍｍ、平均繊維径０．２８４μｍのガラス短繊維（ジョンズマンビル社製 Ｃｏｄｅ１０４）３０質量％、骨格短繊維として繊維長４ｍｍ以下、平均繊維径１０．５μｍのガラス短繊維（ニットーボー社製 チョップドスラント）５０質量％、有機バインダー繊維として平均繊維径７μｍのＰＶＡ繊維（クラレ社製 ＶＰＢ０４１）２０質量％をミキサー（６，０００ｒｐｍ）で離解した。この離解された分散物は、均一な分散状態であった。次いで、離解後の原料を水で濃度０．１質量％まで希釈し、手抄装置を用いて抄紙することによって湿紙を得た。これを８０℃のロールドライヤーで乾燥し、濾材を得た。 Example 11
Glass having a fiber length of 0.284 mm and an average fiber diameter of 0.284 μm as a collecting short fiber (Code 104 manufactured by Johns Manville) 30% by mass, and a skeleton short fiber having a fiber length of 4 mm or less and an average fiber diameter of 10.5 μm 50% by mass of short fibers (chopped slant manufactured by Nitto Bo) and 20% by mass of PVA fibers (VPB041 manufactured by Kuraray Co., Ltd.) having an average fiber diameter of 7 μm as organic binder fibers were disaggregated with a mixer (6,000 rpm). This disaggregated dispersion was in a uniform dispersion state. Next, a wet paper was obtained by diluting the raw material after disaggregation with water to a concentration of 0.1% by mass and making paper using a hand-making apparatus. This was dried with a roll dryer at 80 ° C. to obtain a filter medium.

実施例１２
捕集短繊維として繊維長０．１７５ｍｍ、平均繊維径０．１７５μｍのガラス短繊維（ジョンズマンビル社製 Ｃｏｄｅ９０）１０質量％と、捕集短繊維として繊維長０．２８４ｍｍ、平均繊維径０．２８４μｍのガラス短繊維（ジョンズマンビル社製 Ｃｏｄｅ１０４）１０質量％、骨格短繊維として繊維長４ｍｍ、平均繊維径１０．５μｍのガラス短繊維（ニットーボー社製 チョップドスラント）６０質量％、有機バインダー繊維として平均繊維径７μｍのＰＶＡ繊維（クラレ社製 ＶＰＢ０４１）２０質量％をミキサー（６，０００ｒｐｍ）で離解した。この離解された分散物は、均一な分散状態であった。次いで、離解後の原料を水で濃度０．１質量％まで希釈し、手抄装置を用いて抄紙することによって湿紙を得た。これを１２０℃のロールドライヤーで乾燥し、濾材を得た。 Example 12
10% by mass of a short glass fiber (Code 90 manufactured by Johns Manville) having a fiber length of 0.175 mm and an average fiber diameter of 0.175 μm as a collecting short fiber, and a fiber length of 0.284 mm and an average fiber diameter of 0.84 as a collecting short fiber. 10% by mass of 284 μm short glass fiber (Code 104 manufactured by Johns Manville), 4% fiber length as a skeleton short fiber, 60% by mass short glass fiber (chopped slant manufactured by Nittobo) as an organic binder fiber 20% by mass of PVA fiber (VPB041 manufactured by Kuraray Co., Ltd.) having an average fiber diameter of 7 μm was disaggregated with a mixer (6,000 rpm). This disaggregated dispersion was in a uniform dispersion state. Next, a wet paper was obtained by diluting the raw material after disaggregation with water to a concentration of 0.1% by mass and making paper using a hand-making apparatus. This was dried with a roll dryer at 120 ° C. to obtain a filter medium.

実施例１３
捕集短繊維として繊維長０．１９５ｍｍ、平均繊維径０．１９５μｍのＰＥＴ短繊維１０質量％と、繊維長０．３９５ｍｍ、平均繊維径０．３９５μｍのＰＥＴ短繊維１０質量％、骨格短繊維として繊維長５ｍｍ以下、平均繊維径１２．５μｍのＰＥＴ短繊維（帝人社製 ＴＴ０４ＰＮ）６０質量％、有機バインダー繊維として平均繊維径７μｍのＰＶＡ繊維（クラレ社製 ＶＰＢ０４１）２０質量％をミキサー（６，０００ｒｐｍ）で離解した。この離解された分散物は、均一な分散状態であった。次いで、離解後の原料を水で濃度０．１質量％まで希釈し、手抄装置を用いて抄紙することによって湿紙を得た。これを８０℃のロールドライヤーで乾燥し、濾材を得た。 Example 13
10% by mass of PET short fibers having a fiber length of 0.195 mm and an average fiber diameter of 0.195 μm as collection short fibers, and 10% by mass of PET short fibers having a fiber length of 0.395 mm and an average fiber diameter of 0.395 μm, as skeleton short fibers 60% by mass of a PET short fiber (TT04PN manufactured by Teijin Ltd.) having a fiber length of 5 mm or less and an average fiber diameter of 12.5 μm, and 20% by mass of PVA fiber (VPB041 manufactured by Kuraray Co., Ltd.) having an average fiber diameter of 7 μm as an organic binder fiber are mixed with a mixer (6 000 rpm). This disaggregated dispersion was in a uniform dispersion state. Next, a wet paper was obtained by diluting the raw material after disaggregation with water to a concentration of 0.1% by mass and making paper using a hand-making apparatus. This was dried with a roll dryer at 80 ° C. to obtain a filter medium.

実施例１４
捕集短繊維として繊維長０．１９５ｍｍ、平均繊維径０．１９５μｍのＰＥＴ短繊維５質量％と、繊維長０．１２５ｍｍ、平均繊維径０．１２５μｍのＰＥＴ短繊維１０質量％、骨格短繊維として繊維長５ｍｍ以下、平均繊維径１２．５μｍのＰＥＴ短繊維（帝人社製 ＴＴ０４ＰＮ）６５質量％、有機バインダー繊維として平均繊維径７μｍのＰＶＡ繊維（クラレ社製 ＶＰＢ０４１）２０質量％をミキサー（６，０００ｒｐｍ）で離解した。この離解された分散物は、均一な分散状態であった。次いで、離解後の原料を水で濃度０．１質量％まで希釈し、手抄装置を用いて抄紙することによって湿紙を得た。これを８０℃のロールドライヤーで乾燥し、濾材を得た。 Example 14
As collection short fibers, 5% by mass of PET short fibers having a fiber length of 0.195 mm and an average fiber diameter of 0.195 μm, and 10% by mass of PET short fibers having a fiber length of 0.125 mm and an average fiber diameter of 0.125 μm, as skeleton short fibers 65% by mass of PET short fiber (TT04PN manufactured by Teijin Ltd.) having a fiber length of 5 mm or less and an average fiber diameter of 12.5 μm, and 20% by mass of PVA fiber (VPB041 manufactured by Kuraray Co., Ltd.) having an average fiber diameter of 7 μm as an organic binder fiber (6, 000 rpm). This disaggregated dispersion was in a uniform dispersion state. Next, a wet paper was obtained by diluting the raw material after disaggregation with water to a concentration of 0.1% by mass and making paper using a hand-making apparatus. This was dried with a roll dryer at 80 ° C. to obtain a filter medium.

比較例４
捕集短繊維として繊維長０．１７５ｍｍ、平均繊維径０．１７５μｍのガラス短繊維（ジョンズマンビル社製 Ｃｏｄｅ９０）１０質量％と、捕集短繊維として繊維長０．２８４ｍｍ、平均繊維径０．２８４μｍのガラス短繊維（ジョンズマンビル社製 Ｃｏｄｅ１０４）１０質量％、骨格短繊維として繊維長４ｍｍ、平均繊維径１０．５μｍのガラス短繊維（ニットーボー社製 チョップドスラント）６０質量％、有機バインダー繊維として平均繊維径７μｍのＰＶＡ繊維（クラレ社製 ＶＰＢ０４１）２０質量％をミキサー（６，０００ｒｐｍ）で離解した。この離解された分散物は、均一な分散状態であった。次いで、離解後の原料を水で濃度０．１質量％まで希釈し、手抄装置を用いて抄紙することによって湿紙を得た。これを１５０℃のロールドライヤーで乾燥し、濾材を得た。 Comparative Example 4
10% by mass of a short glass fiber (Code 90 manufactured by Johns Manville) having a fiber length of 0.175 mm and an average fiber diameter of 0.175 μm as a collecting short fiber, and a fiber length of 0.284 mm and an average fiber diameter of 0.84 as a collecting short fiber. 10% by mass of 284 μm short glass fiber (Code 104 manufactured by Johns Manville), 4% fiber length as a skeleton short fiber, 60% by mass short glass fiber (chopped slant manufactured by Nittobo) as an organic binder fiber 20% by mass of PVA fiber (VPB041 manufactured by Kuraray Co., Ltd.) having an average fiber diameter of 7 μm was disaggregated with a mixer (6,000 rpm). This disaggregated dispersion was in a uniform dispersion state. Next, a wet paper was obtained by diluting the raw material after disaggregation with water to a concentration of 0.1% by mass and making paper using a hand-making apparatus. This was dried with a roll dryer at 150 ° C. to obtain a filter medium.

比較例５
捕集短繊維として繊維長０．１７５ｍｍ、平均繊維径０．１７５μｍのガラス短繊維（ジョンズマンビル社製 Ｃｏｄｅ９０）３０質量％、骨格短繊維として繊維長４ｍｍ、平均繊維径１０．５μｍのガラス短繊維（ニットーボー社製 チョップドスラント）５０質量％、有機バインダー繊維として平均繊維径７μｍのＰＶＡ繊維（クラレ社製 ＶＰＢ０４１）２０質量％をミキサー（６，０００ｒｐｍ）で離解した。この離解された分散物は、均一な分散状態であった。次いで、離解後の原料を水で濃度０．１質量％まで希釈し、手抄装置を用いて抄紙することによって湿紙を得た。これを８０℃のロールドライヤーで乾燥し、濾材を得た。 Comparative Example 5
30% by mass of short glass fibers (Code 90 manufactured by Johnsmanville Co., Ltd.) having a fiber length of 0.175 mm and an average fiber diameter of 0.175 μm as collection short fibers, and a short glass having a fiber length of 4 mm and an average fiber diameter of 10.5 μm as skeleton short fibers 50% by mass of fibers (Nittobo chopped slant) and 20% by mass of PVA fibers (VPB041 made by Kuraray Co., Ltd.) having an average fiber diameter of 7 μm as organic binder fibers were disaggregated with a mixer (6,000 rpm). This disaggregated dispersion was in a uniform dispersion state. Next, a wet paper was obtained by diluting the raw material after disaggregation with water to a concentration of 0.1% by mass and making paper using a hand-making apparatus. This was dried with a roll dryer at 80 ° C. to obtain a filter medium.

次ぎに、前記実施例９乃至１４及び比較例例４及び５のエアフィルタ用濾材について上記と同様にして捕集効率（％）と圧力損失（Ｐａ）を求め、それらからＰＦ値を求め図３に示した。   Next, for the air filter media of Examples 9 to 14 and Comparative Examples 4 and 5, the collection efficiency (%) and the pressure loss (Pa) are obtained in the same manner as described above, and the PF value is obtained therefrom. It was shown to.

次ぎに、前記濾材を用い、折幅６５ｍｍ、山数８０山、風量５６ｍ３／ｍｉｎの準ＰＥＰＡ（６１０×６１０×２９０）を作成した。
得られた中性能フィルタについて上記と同様にして捕集効率（％）と圧力損失（Ｐａ）を求め、それらからＰＦ値を求め図３に示した。 Next, a quasi-PEPA (610 × 610 × 290) having a folding width of 65 mm, a mountain number of 80, and an air volume of 56 m 3 / min was prepared using the filter medium.
With respect to the obtained medium performance filter, the collection efficiency (%) and the pressure loss (Pa) were obtained in the same manner as described above, and the PF value was obtained therefrom and shown in FIG.

比較例１、比較例３及び比較例４の場合、乾燥温度が高すぎたため、有機バインダー繊維が膜化した結果圧力損失が高いものになってしまった。また、比較例２の場合、平均繊維径０．２８４μｍのガラス短繊維の配合量が少なすぎて捕集効率の悪いもものになった。また、比較例５の場合、平均繊維径０．１７５μｍのガラス短繊維の配合量が多すぎて圧力損失の高いものになった。
比較例１乃至５以外の本願発明実施例の場合は、中性能フィルタ、準ＨＥＰＡフィルタ、ＨＥＰＡフィルタと全てのグレードにおいて、ＰＦ値が１１以上で、低圧損化・高捕集効率化が実現されていた。 In the case of Comparative Example 1, Comparative Example 3 and Comparative Example 4, since the drying temperature was too high, the pressure loss was high as a result of forming the organic binder fiber into a film. Moreover, in the case of the comparative example 2, the compounding quantity of the short glass fiber with an average fiber diameter of 0.284 micrometers was too small, and it became a thing with bad collection efficiency. Moreover, in the case of the comparative example 5, the compounding quantity of the short glass fiber with an average fiber diameter of 0.175 micrometers was too much, and became a thing with a high pressure loss.
In the case of the embodiments of the present invention other than Comparative Examples 1 to 5, the PF value is 11 or more in all grades including the medium performance filter, the semi-HEPA filter, and the HEPA filter, and low pressure loss and high collection efficiency are realized. It was.

本発明のエアフィルタ用濾材並びにそれを用いたエアフィルタは、中性能エアフィルタ、準ＨＥＰＡフィルタ、ＨＥＰＡフィルタ等のグレードを問わず、ＰＦ値が１１以上の低圧損化・高捕集効率化したエアフィルタ用濾材並びにエアフィルタが得られ産業上有用である。   The filter medium for air filter of the present invention and the air filter using the same have a low-pressure loss and high collection efficiency with a PF value of 11 or more regardless of the grade of medium performance air filter, semi-HEPA filter, HEPA filter, etc. An air filter medium and an air filter are obtained and are industrially useful.

Claims (7)

短繊維からなるエアフィルタ用濾材において前記短繊維を骨格短繊維とこれより細径の捕集短繊維と、有機バインダー繊維で構成しこれらが均一に分散され、下記式（１）で表されるＰＦ値が１１以上であることを特徴とするエアフィルタ用濾材。
ＰＦ値＝log10(1-捕集効率［%］/100)/(圧力損失［Pa］/9.8)×（-100) （１）
捕集効率の粒径は0.1〜0.15μm、面風速は5.3cm/秒とする。 In the filter medium for an air filter made of short fibers, the short fibers are composed of skeleton short fibers, finer collection short fibers, and organic binder fibers, and these are uniformly dispersed and represented by the following formula (1). A filter medium for an air filter having a PF value of 11 or more.
PF value = log 10 (1-capture efficiency [%] / 100) / (pressure loss [Pa] /9.8) × (-100) (1)
The particle size of the collection efficiency is 0.1 to 0.15 μm, and the surface wind speed is 5.3 cm / second. 前記骨格短繊維が４５〜８０質量％、前記捕集短繊維が５〜３０質量％、前記有機バインダー繊維が１５〜２５質量％からなることを特徴とする請求項１記載のエアフィルタ用濾材。   The filter medium for an air filter according to claim 1, wherein the skeleton short fiber is 45 to 80% by mass, the collection short fiber is 5 to 30% by mass, and the organic binder fiber is 15 to 25% by mass. 前記骨格短繊維の繊維長が１〜５ｍｍで平均繊維径が９〜１３μｍ、前記捕集短繊維の繊維長が０．０５ｍｍ〜０．５ｍｍで平均繊維径が０．０５〜０．５μｍ、前記有機バインダー繊維の繊維長が１．０〜４．０ｍｍで平均繊維径が６．０〜１６．５μｍであることを特徴とする請求項１または２の何れか１項に記載のエアフィルタ用濾材。   The skeletal short fiber has a fiber length of 1 to 5 mm and an average fiber diameter of 9 to 13 μm, the collected short fiber has a fiber length of 0.05 mm to 0.5 mm and an average fiber diameter of 0.05 to 0.5 μm, The filter material for an air filter according to any one of claims 1 and 2, wherein the organic binder fiber has a fiber length of 1.0 to 4.0 mm and an average fiber diameter of 6.0 to 16.5 µm. . 前記捕集短繊維の平均繊維径が０．２μｍ以下のものが濾材の５〜１０質量％の範囲内及び／または前記短繊維の平均繊維径０．２μｍを越えるものが濾材の１０〜１５質量％の範囲内であることを特徴とする請求項１乃至３の何れか１項に記載エアフィルタ用濾材。   Those whose collected short fibers have an average fiber diameter of 0.2 μm or less are within the range of 5 to 10% by mass of the filter medium and / or those whose short fibers exceed the average fiber diameter of 0.2 μm are 10 to 15 mass of the filter medium. The filter medium for air filters according to any one of claims 1 to 3, wherein the filter medium is within a range of%. 前記骨格短繊維及び捕集短繊維がガラス短繊維であることを特徴とする請求項１乃至４の何れか１項に記載のエアフィルタ用濾材。   The filter medium for an air filter according to any one of claims 1 to 4, wherein the skeleton short fibers and the collection short fibers are short glass fibers. 前記有機バインダー繊維はポリビニルアルコール繊維であることを特徴とする請求１乃至５の何れか１項に記載のエアフィルタ用濾材。   The air filter medium according to any one of claims 1 to 5, wherein the organic binder fiber is a polyvinyl alcohol fiber. 前記請求項１乃至６の何れか１項に記載のエアフィルタ用濾材を用いたことを特徴とするエアフィルタ。   An air filter using the air filter medium according to any one of claims 1 to 6.
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