JPH0531310A - Filter medium having pleating property and fire retardant property - Google Patents

Filter medium having pleating property and fire retardant property

Info

Publication number
JPH0531310A
JPH0531310A JP3194383A JP19438391A JPH0531310A JP H0531310 A JPH0531310 A JP H0531310A JP 3194383 A JP3194383 A JP 3194383A JP 19438391 A JP19438391 A JP 19438391A JP H0531310 A JPH0531310 A JP H0531310A
Authority
JP
Japan
Prior art keywords
fibers
fiber
filter medium
self
bonding
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP3194383A
Other languages
Japanese (ja)
Inventor
Ryoichi Togashi
良一 富樫
Hiroyasu Kato
博恭 加藤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toray Industries Inc
Original Assignee
Toray Industries Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toray Industries Inc filed Critical Toray Industries Inc
Priority to JP3194383A priority Critical patent/JPH0531310A/en
Publication of JPH0531310A publication Critical patent/JPH0531310A/en
Pending legal-status Critical Current

Links

Landscapes

  • Filtering Materials (AREA)
  • Multicomponent Fibers (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
  • Nonwoven Fabrics (AREA)

Abstract

PURPOSE:To obtain a filter medium which has good unitizing aptitude, namely good pleating properties (stiffness) and fire retardant characteristics and also excellent dust retaining properties and is capable of exhibiting good filtration performance in a range over a long period. CONSTITUTION:A filter medium is constituted of a nonwoven fabric in which at least three fibers of extremely fine short fiber having diameter of single yarn fiber smaller than 10mum, 30-80wt.% self-welding fiber and 10-50wt.% fire retardant organic fiber having >=25 LOI value are bonded with each other by the self-welding fiber and bending resistance is regulated to >=100mm.

Description

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

【０００１】[0001]

【産業上の利用分野】本発明は、濾材に関し、詳しくは
良好なプリーツ加工性と難燃性とを有し、また、ダスト
保持性に優れていて長期にわたり良好な濾過性能を発揮
し得る濾材に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter medium, and more particularly to a filter medium having good pleating processability and flame retardancy, and having excellent dust retention and exhibiting good filtration performance for a long period of time. It is about.

【０００２】[0002]

【従来技術】空調用濾材に要求される特性としてフィル
ター特性のほかに、濾材をユニット化するため、濾材を
山谷折りするための剛性とプリーツ加工適性（以下、こ
れらを総称して「プリーツ加工性」という）が求められ
る。2. Description of the Related Art In addition to the filter characteristics required for air-conditioning filter media, the filter media are unitized so that the filter media can be folded in a ridge-and-valley rigidity and pleatability (hereinafter collectively referred to as "pleat processability"). Is called).

【０００３】従来技術では繊度２デニール以上の比較的
太い繊維からなる単層不織布を剛性難燃樹脂で加工する
ことで上記要求を満たす方法などが知られているが、従
来の該樹脂加工した濾材ではダストを保持する空間が樹
脂の付着によって失われ、ダスト保持量が少なく、良好
な濾過性能を発揮しうる期間が短く、濾材寿命が非常に
短いものであった。In the prior art, there is known a method of satisfying the above-mentioned requirements by processing a single-layer non-woven fabric made of relatively thick fibers having a fineness of 2 denier or more with a rigid flame-retardant resin. In the above, the space for holding the dust was lost due to the adhesion of the resin, the amount of dust held was small, the period during which good filtration performance could be exhibited was short, and the life of the filter medium was very short.

【０００４】さらに高性能な濾材として極細繊維を用い
た濾材が知られている。例えば極細繊維を濾材の一部に
用いた公知技術として、特公平３−２８８９２号公報、
特開平２−９１２６２号公報、特開昭５１−１３４４７
５号公報、特開平２−１０４７６５号公報、特開平２−
３０３５０９号公報、実願平２−１２４１５号公報、特
開平２−１５１２１８号公報に記載された提案などが知
られている。A filter medium using ultrafine fibers is known as a high-performance filter medium. For example, as a known technique using ultrafine fibers as a part of a filter medium, Japanese Examined Patent Publication No. 3-28892 is disclosed.
JP-A-2-91262, JP-A-51-13447
5, JP-A-2-104765, JP-A-2-104765.
The proposals described in JP-A-303509, JP-A-2-12415, and JP-A-2-151218 are known.

【０００５】このうち、特公平３−２８８９２号公報に
記載のものでは、極細繊維にメルトブロー不織布を用い
ており、これに剛性樹脂で加工した不織布支持層を積層
して用いている。かかる従来技術では、メルトブロー不
織布にプリーツ加工性向上と難燃性を与えるために別個
の支持層が用いられており、極細繊維からなるメルトブ
ロー不織布自身に剛性を与えるものではなかった。ま
た、上流側の粗構造濾材の捕集効率が低いため、緻密な
メルトブロー不織布層に高濃度のダストがそのまま到達
するので圧力損失上昇が早く濾材の性能を良好に発揮し
得るフィルター寿命が短いものであった。また、特開平
２−１０４７６５号公報ではメルトブロー不織布に自己
融着性短繊維を混ぜ嵩高で形態安定性を与える方法が示
されている。この従来技術でも嵩高性と形態安定化を目
的とするものでメルトブロー不織布自身にプリーツに耐
える剛性を与えるものではなかった。また、特開平２−
９１２６２号公報に記載された発明の場合、その実施例
から明らかなように、極細繊維はメルトブローされた繊
維であり、加えて、フィルター特性に重要な影響を有す
る繊維の開繊状態やポアサイズ、さらに濾材をユニット
化して用いるものであるために必要なプリーツ加工性の
適性化や難燃性への言及がなく、空調用濾材として必要
な技術知見を示すものではなく、単なる一般的な不織布
やフィルターの高強力化方法をメルトブロー不織布で示
すことを目的とすることが明らかである。Among these, in the one disclosed in Japanese Patent Publication No. 28892/1989, a melt blown non-woven fabric is used for the ultrafine fibers, and a non-woven fabric support layer processed with a rigid resin is laminated and used. In such a conventional technique, a separate support layer is used to give the meltblown non-woven fabric an improved pleating property and flame retardancy, and does not impart rigidity to the melt-blown non-woven fabric itself. Further, since the collection efficiency of the coarse structure filter medium on the upstream side is low, a high concentration of dust reaches the dense melt-blown nonwoven fabric layer as it is, so the pressure loss rises quickly and the filter life can be exhibited satisfactorily. Met. Further, Japanese Patent Application Laid-Open No. 2-104765 discloses a method of adding self-fusing short fibers to a meltblown nonwoven fabric to give bulkiness and shape stability. This conventional technique also aims to increase the bulkiness and stabilize the morphology, and does not give the meltblown nonwoven fabric the rigidity to withstand pleats. In addition, JP-A-2-
In the case of the invention described in Japanese Patent No. 91262, as is clear from the examples, the ultrafine fibers are meltblown fibers, and in addition, the opened state and the pore size of the fibers which have an important influence on the filter characteristics, There is no reference to suitability for pleating processability and flame retardance necessary for unitizing the filter media, and it does not show the technical knowledge necessary for air-conditioning filter media. It is clear that the purpose is to show the method of increasing the strength of the above with a melt blown nonwoven fabric.

【０００６】さらに、特開平２−３０３５０９号公報に
記載された発明では、フィブリル化することで得た極細
繊維を抄紙法で不織布状としこれに自己融着性繊維を同
様に抄紙法で不織布状とし重合してＨＥＰＡフィルター
を得る技術が示されているが、この方法は積層して用い
ており自己融着性繊維の使用目的が毛羽立ちや脱落を防
ぐものであり、極細繊維の濾材自身に剛性を与える考え
方は示されていない。また、抄紙法で行なうため、繊維
長が５ｍｍ程度と極端に短く、極細長・短繊維を嵩高に
かつ剛性アップを図る考え方は示されていないものであ
った。また実願平２−１２４１５号公報に記載された発
明でも、極細繊維と自己融着性繊維を用いた濾材が示さ
れているが、このものはそれぞれの不織布層を積層する
ことで毛羽立ち性とダスト剥離性を改善するものであ
り、同様に極細繊維使い濾材自身の剛性化を図るもので
はなかった。Further, in the invention described in JP-A-2-303509, the ultrafine fibers obtained by fibrillation are made into a non-woven fabric by a papermaking method, and the self-fusing fibers are similarly formed into a non-woven fabric by a papermaking method. A technique for obtaining a HEPA filter by polymerization is shown, but this method is used by laminating and the purpose of the self-fusing fiber is to prevent fluffing and falling off, and to add rigidity to the ultrafine fiber filter medium itself. The idea of giving is not shown. Further, since the method is performed by a papermaking method, the fiber length is extremely short, about 5 mm, and the idea of making ultrafine long / short fibers bulky and increasing the rigidity has not been shown. Also, the invention described in Japanese Patent Application No. 2-12415 discloses a filter medium using ultrafine fibers and self-bonding fibers, but this one has fuzziness by laminating the respective non-woven fabric layers. It was intended to improve the dust releasability, and likewise not to increase the rigidity of the filter medium itself using ultrafine fibers.

【０００７】次に難燃化については、特開昭５１−１３
４４７５号公報には極細繊維濾材の難燃化技術が示され
ているが、この方法は難燃性繊維あるいは可燃性繊維か
らなる不織布を剛性のある難燃性樹脂で樹脂加工するこ
とで難燃化した嵩高な不織布と難燃化していない極細不
織布層（メルトブロー不織布）を積層することにより難
燃濾材を得る技術であり、極細繊維からなる不織布層全
体で難燃性を図るという考え方は示されていないもので
あった。Next, regarding flame retardation, Japanese Patent Laid-Open No. 51-13
Japanese Patent No. 4475 discloses a flame-retardant technique for an ultrafine fiber filter medium. This method is flame-retardant by processing a non-woven fabric composed of flame-retardant fibers or combustible fibers with a rigid flame-retardant resin. This is a technology for obtaining a flame-retardant filter medium by laminating a bulky non-woven fabric and an ultra-fine non-woven fabric layer (melt-blown non-woven fabric), and the idea of achieving flame retardancy in the entire non-woven fabric layer made of ultra-fine fibers has been suggested. It wasn't.

【０００８】さらに極細繊維ではないが、特開平２−１
５１２１８号公報には、極太繊維に自己融着性繊維を混
ぜて剛性アップを図るセパレート不織布技術が示されて
いるが、このものは、セパレート不織布でメルトブロー
濾材の分離を目的とするもので、積極的にダストを捕集
する濾材ではないものであった。この考え方には極細繊
維を含む層を積極的に濾材として用いるため剛性アップ
と難燃化を図る考え方はないものであった。Further, although it is not an ultrafine fiber, it is not disclosed in Japanese Patent Laid-Open No. 2-1.
Japanese Patent No. 51218 discloses a separate non-woven fabric technology for increasing rigidity by mixing a self-bonding fiber with a very thick fiber, which is intended to separate a melt blown filter medium with a separate non-woven fabric, It was not a filter medium for collecting dust. There is no idea in this way of thinking that the layer containing ultrafine fibers is positively used as a filter medium to improve rigidity and flame retardancy.

【０００９】このように従来技術は、極細繊維を含む嵩
高な濾材層のみでユニット適性化（剛性向上と難燃化）
を図り、かつ長期にわたり良好な濾過性能を発揮しうる
長寿命な空気処理用濾材を得るという考え方はないもの
であった。As described above, according to the conventional technique, the unit is made suitable only by a bulky filter medium layer containing ultrafine fibers (improved rigidity and flame retardance).
However, there is no idea to obtain a long-life filter medium for air treatment that can achieve good filtration performance over a long period of time.

【００１０】[0010]

【発明が解決しようとする課題】本発明の目的は、上述
したような点に鑑み、特別な繊維構成とした濾材に関
し、良好なユニット化適性、すなわち良好なプリーツ加
工性（剛性）と難燃特性を有するとともに、優れたダス
ト保持性も有しており長期にわたり良好な濾過性能を発
揮し得る新規な濾材を提供せんとするものである。SUMMARY OF THE INVENTION In view of the above points, an object of the present invention is to provide a filter medium having a special fiber structure, which has good suitability for unitization, that is, good pleat workability (rigidity) and flame retardancy. It is intended to provide a novel filter medium which has not only the characteristics but also an excellent dust holding property and can exhibit a good filtration performance for a long period of time.

【００１１】[0011]

【課題を解決するための手段】本発明は、次の構成を有
する。The present invention has the following configuration.

【００１２】すなわち、本発明の濾材は、単糸繊維直径
１０μｍ未満の極細短繊維と、３０〜８０重量％の自己
融着性繊維および１０〜５０重量％のＬＯＩ値２５以上
の有機難燃繊維の少なくとも三者の繊維をランダムに含
み、かつ構成繊維どうしが前記自己融着性繊維によって
部分的に接着されたポアサイズが３０〜１５０μｍ、剛
軟度が１００ｍｍ以上である不織布からなる濾材であ
る。That is, the filter medium of the present invention comprises ultrafine short fibers having a diameter of less than 10 μm, self-fusing fibers of 30 to 80% by weight and organic flame-retardant fibers of 10 to 50% by weight with LOI value of 25 or more. Of the non-woven fabric, which randomly contains at least three types of fibers, and whose constituent fibers are partially adhered by the self-bonding fibers have a pore size of 30 to 150 μm and a bending resistance of 100 mm or more.

【００１３】あるいはまた、本発明の濾材は、単糸繊維
直径１０μｍ未満の極細短繊維と、３０〜８０重量％の
自己融着性繊維および１０〜５０重量％のＬＯＩ値２５
以上の有機難燃繊維の少なくとも三者の繊維をランダム
に含み、かつ該極細繊維、自己融着性繊維および有機難
燃繊維の少なくともいずれかがエレクトレット化繊維で
あり、構成繊維どうしが前記自己融着性繊維によって部
分的に接着されたポアサイズが３０〜２５０μｍ、剛軟
度が１００ｍｍ以上である不織布からなる濾材である。Alternatively, the filter medium of the present invention comprises ultrafine short fibers having a diameter of a single fiber of less than 10 μm, 30 to 80% by weight of self-bonding fibers and 10 to 50% by weight of LOI value 25.
Randomly containing at least three fibers of the above organic flame-retardant fibers, and at least one of the ultrafine fibers, self-bonding fibers and organic flame-retardant fibers is an electretized fiber, the constituent fibers are the self-melting fibers. It is a filter medium made of a non-woven fabric having a pore size of 30 to 250 μm and a bending resistance of 100 mm or more, which are partially adhered by adhesive fibers.

【００１４】[0014]

【作用】本発明は、主に各種空気処理用に適する極細短
繊維を含む嵩高な長寿命の濾材に関し、プリーツ加工性
と難燃特性を繊維構成で満足させた長寿命濾材に関し、
以下に詳細を説明する。The present invention mainly relates to a bulky long-life filter medium containing ultrafine short fibers suitable for various air treatments, and to a long-life filter medium satisfying pleating processability and flame retardant properties in a fiber structure,
The details will be described below.

【００１５】本発明の濾材に用いられる繊維は、極細繊
維と自己融着性繊維および有機性難燃繊維であり、これ
ら三者の繊維を少なくとも構成繊維としてランダムに含
んでなる不織布を、濾材材料として用いてなるものであ
る。ただし、該濾材材料は、さらに、用途によってメル
トブロー不織布やエレクトレット化メルトブロー不織布
が積層されて用いられてもよい。The fibers used in the filter medium of the present invention are ultrafine fibers, self-fusing fibers, and organic flame-retardant fibers. A nonwoven fabric containing these three fibers at least as constituent fibers at random is used as the filter medium material. It is used as. However, the filter medium material may be used by further laminating a meltblown nonwoven fabric or an electretized meltblown nonwoven fabric depending on the application.

【００１６】用いられる単糸直径１０μｍ未満の極細繊
維は、剛性アップを目的として使用される自己融着性繊
維（対不織布重量比で３０〜８０重量％）とＬＯＩ値２
５以上の有機性難燃繊維（対不織布重量比で１０〜５０
重量％）と混合して用いられる。それら繊維どうしは、
上述自己融着性繊維によって、部分的に加熱によって繊
維の接触交絡点で融着化・固定化され、剛軟度１００ｍ
ｍ以上、繊維の密度がポアサイズ（繊維間平均空間距離
を表わす）で３０〜１５０μｍ範囲内の、上述濾材材料
としての不織布を構成するものである。The ultrafine fibers having a single yarn diameter of less than 10 μm are self-fusing fibers (30 to 80% by weight based on the weight of the non-woven fabric) and LOI value 2 used for the purpose of increasing the rigidity.
5 or more organic flame-retardant fibers (10 to 50 in weight ratio to non-woven fabric)
% By weight). These fibers are
The self-bonding fibers described above are partially fused and fixed at the contact entanglement points of the fibers by heating, and have a bending resistance of 100 m.
m or more, and the density of the fibers is within the range of 30 to 150 μm in pore size (representing the average spatial distance between the fibers), and constitutes the non-woven fabric as the above-mentioned filter material.

【００１７】不織布化の手段は、カードとクロスラッパ
ーあるいはランダムウエッバー、エアーレイなどの一般
的に捲縮を有する短繊維をウエッブ化する方法を用いて
ウエッブ化しこれを直接自己融着性繊維の融点前後の温
度である加熱下雰囲気で圧縮して厚み設定する方法や、
ニードルパンチした後同様の方法で厚み設定する方法な
どを用いて、不織布とすることができる。The non-woven fabric is formed by webbing a short fiber having a crimp, such as a card and a cross wrapper, a random webber, or an air lay, and then directly webbing the melting point of the self-bonding fiber. A method to set the thickness by compressing in an atmosphere under heating which is the temperature around,
A non-woven fabric can be obtained by using a method such as needle punching and then setting the thickness in the same manner.

【００１８】これらの繊維構成要素について、さらに詳
しく説明すると、極細繊維は単糸繊維直径１０μｍ未満
の繊維が高い捕集効率を少ない目付で得る目的に有利で
ある。特に５μｍ未満の極細繊維が低目付、薄物化の要
求から本発明には好適素材である。Explaining these fiber components in more detail, ultrafine fibers are advantageous for the purpose of obtaining a high collection efficiency of fibers having a diameter of a single fiber of less than 10 μm with a small basis weight. In particular, ultrafine fibers of less than 5 μm are suitable materials for the present invention because of their low weight and requirement for thinning.

【００１９】該繊維直径の下限は、良好に開繊されてい
るのであれば小さいほど好ましい（良好に開繊されずに
どちらかといえば束状の構造に近いのであれば、繊維直
径が小さくても良くない）といえるが、コストの点や開
繊性のことなどを考慮すると、数μからサブミクロン程
度までが実際上は好ましい下限値である。ただし、この
下限値は、開繊が良好であれば更に小さいものであって
も差支えない点、前述の通りである。The lower limit of the fiber diameter is preferably as small as possible if it is satisfactorily opened (if the fiber is not satisfactorily opened and is rather close to a bundle-like structure, the fiber diameter is small. However, considering the cost and the spreadability, a practically preferable lower limit is from several μ to submicron. However, as described above, the lower limit may be smaller if the spread is good.

【００２０】繊維直径が１０μｍよりも大きい場合、捕
集効率が極細繊維使用の同目付の場合よりも低下するの
で、同じ捕集効率を得るためにはより高目付であること
を要する。このため濾材が厚くなり好ましくない。When the fiber diameter is larger than 10 μm, the collection efficiency is lower than that in the case of using the same weight using the ultrafine fibers. Therefore, a higher weight is required to obtain the same collecting efficiency. Therefore, the filter medium becomes thick, which is not preferable.

【００２１】素材として適するものは、紡糸により直接
的に得られる極細の繊維ステープル、繊維の分割によっ
て極細化が可能となる分割繊維、また、フィブリル化す
ることで極細化が可能なフィブリル化繊維などよりなる
短繊維であるが、繊維長としては１５ｍｍ以上〜１００
ｍｍ未満の範囲のものが好ましく、より好ましくは２０
ｍｍ以上６０ｍｍ以下のもの等である。ただし、不織ウ
ェッブの形成手法によっては、この範囲以外のものであ
ってもよく、たとえば抄紙法の場合にはこれら範囲外の
もっと短いものであってもよい。上述の極細繊維の形成
法の中では紡糸により直接的に得られるステープルが最
も適する。これは該ステープルは、カードを用いてウエ
ッブ化する工程で１本１本に解繊されるため、ポアサイ
ズの均一化とフィルター特性バラツキの少なさにおいて
他よりも優れており、また捲縮の付与されているもので
あれば、嵩高で目的のポアサイズに成型しやすい特性を
有するためである。Suitable materials are ultrafine fiber staples directly obtained by spinning, split fibers which can be made into fine fibers by fiber division, and fibrillated fibers which can be made into fine fibers by fibrillation. The length of the fiber is 15 mm or more to 100
It is preferably in the range of less than mm, more preferably 20
mm or more and 60 mm or less. However, it may be out of this range depending on the method of forming the non-woven web. For example, in the case of a papermaking method, it may be shorter than this range. Of the above-mentioned ultrafine fiber forming methods, staples directly obtained by spinning are most suitable. This is because the staples are defibrated into individual pieces during the web-making process using a card, so they are superior to the others in terms of uniform pore size and less variation in filter characteristics, and crimping. This is because, if it has been used, it has a characteristic that it is bulky and can be easily molded into a desired pore size.

【００２２】ステープルの中では、繊維直径が２〜８μ
ｍのポリプロピレン、アクリル、ポリエステル、ポリエ
チレン、ポリカーボネート、ポリアミド極細繊維などが
カード通過性も良く適する。特にポリプロピレンやポリ
カーボネートはエレクトレット化も容易で高い捕集効率
が得られるので好適な素材である。In the staple, the fiber diameter is 2 to 8 μm.
Polypropylene, acrylic, polyester, polyethylene, polycarbonate, polyamide ultrafine fibers of m, etc. are also suitable because they have good card passage properties. In particular, polypropylene and polycarbonate are suitable materials because they can be easily electretized and high collection efficiency can be obtained.

【００２３】自己融着性繊維は、剛性の向上を目的とし
て用いるものである。このため素材と使用割合が重要な
意味を有する。繊維断面構造として芯鞘構造やバイメタ
ル構造をした低融点成分と高融点成分からなる融点差が
３０℃以上のものが適し、特に芯鞘構造のもので捲縮数
も少なく、かつ熱収縮が少なく捲縮率１５％以下のもの
が剛性アップ効果が高く好適である。このため、鞘がポ
リエチレンまたは共重合ポリエチレンと芯がポリプロピ
レンなどの組み合わせ、あるいは鞘が共重合ポリエステ
ルと芯がポリエチレンテレフタレートなどの組合わせが
適する。中でも、鞘が共重合ポリエステル（融点６０〜
１４０℃）で芯がポリエチレンテレフタレート（融点２
５８℃）の組合わせが温度差が大きいので収縮が少な
く、かつ素材の剛性も高いことから剛性アップ効果も高
く優れている。また、エレクトレット繊維を一部に用い
た場合、融着化のための高温加熱によってエレクトレッ
ト性が減少するので、安定化のためにも低温で接着でき
る融点６０〜１４０℃範囲の素材が最適である。The self-bonding fiber is used for the purpose of improving rigidity. For this reason, the material and the usage rate are important. A fiber having a core-sheath structure or a bimetal structure with a melting point difference of 30 ° C. or more composed of a low-melting point component and a high-melting point component is suitable as a fiber cross-sectional structure, and particularly a core-sheath structure having a small number of crimps and a small heat shrinkage. Those having a crimping ratio of 15% or less are suitable because they have a high effect of increasing rigidity. For this reason, a combination of polyethylene or copolymer polyethylene for the sheath and polypropylene for the core, or a combination of copolymer polyester for the sheath and polyethylene terephthalate for the core is suitable. Among them, the sheath is a copolyester (melting point 60 to
At 140 ° C, the core is polyethylene terephthalate (melting point 2
(58 ° C) has a large temperature difference, so there is little shrinkage, and the rigidity of the material is also high, so the effect of increasing rigidity is also high. Further, when part of the electret fiber is used, the electret property is reduced by high-temperature heating for fusing, so a material having a melting point of 60 to 140 ° C. that can be bonded at low temperature is also optimal for stabilization. .

【００２４】なお、芯鞘構造とは、同心円構造および偏
心構造の繊維も含むものである。The core-sheath structure also includes fibers having a concentric structure and an eccentric structure.

【００２５】自己融着性繊維の繊度は、１〜３０デニー
ル範囲のものが使用できるが、繊度が細すぎると剛性ア
ップ効果が低く、また太過ぎても濾材中に含まれる繊維
本数が減少し接着点が少なくなり、同様に剛性アップ効
果が低いものとなる、さらに捕集効率とプリーツ加工適
性の関係から１〜２０デニール範囲のものが適するもの
である。The fineness of the self-fusing fiber may be in the range of 1 to 30 denier, but if the fineness is too thin, the effect of increasing the rigidity is low, and if it is too thick, the number of fibers contained in the filter medium decreases. In the range of 1 to 20 denier, the number of adhesion points is reduced and the effect of increasing rigidity is also low.

【００２６】また、自己融着性繊維の使用量は、３０〜
８０重量％割合で用いるもので、濾材の全体目付、自己
融着性繊維の繊度、素材および極細繊維の使用量によっ
て使用割合は変化するものであるが、剛軟度（４５度カ
ンチレバー法）で１００ｍｍ以上であるように、望まし
くは１５０ｍｍ以上が得られるように使用量を決定す
る。これは、プリーツ加工した濾材の形状が風圧によっ
て変形しないようにするために必要な特性範囲を表わす
ものである。The amount of the self-bonding fiber used is 30 to 30.
It is used at a ratio of 80% by weight. The usage ratio varies depending on the total basis weight of the filter medium, the fineness of the self-bonding fiber, the material and the amount of the ultrafine fiber used, but the bending resistance (45 degree cantilever method) The amount used is determined so that it is 100 mm or more, preferably 150 mm or more. This represents a characteristic range required for preventing the shape of the pleated filter medium from being deformed by wind pressure.

【００２７】一般的に自己融着性繊維と極細繊維および
有機性難燃繊維との接着点の数は多い方が濾材の強度は
高くなるが、剛性は接着強度だけに関係するのではな
く、特に濾材の厚さにも関係する。その他、自己融着性
繊維の使用割合、繊度、素材などと密接に関係し、さら
にこれらの構成要素によって変化するポアサイズは捕集
効率と寿命を左右するので、目的範囲のポアサイズが得
られる条件で剛性をも満足させるように自己融着性繊維
の使用割合、繊度、素材を選定することが必要である。Generally, the greater the number of bonding points between the self-fusing fiber, the ultrafine fiber and the organic flame-retardant fiber, the higher the strength of the filter medium, but the rigidity is not related only to the bonding strength, In particular, it is also related to the thickness of the filter medium. In addition, the pore size, which is closely related to the usage ratio, fineness, material, etc. of the self-bonding fiber, and changes depending on these constituent elements affects the collection efficiency and life, so it is necessary to obtain the pore size in the target range. It is necessary to select the use ratio, fineness, and material of the self-fusing fiber so that the rigidity is also satisfied.

【００２８】例えば、全体目付１００ｇ、極細繊維が８
μｍのポリエステル繊維３０ｇ、自己融着性繊維がポリ
エステル系で繊度４デニールのものを７０ｇ用いた条件
で１５０ｍｍの剛軟度が得られる。また、全体目付１１
０ｇ、極細繊維が３．４μｍのアクリル繊維２０ｇ、自
己融着性繊維が繊度１．５デニールの共重合ポリエチレ
ンと芯がポリプロピレンを６０ｇ、さらに有機性有機性
難燃繊維（モダクリル繊維）２．４デニールを３０ｇ用
いた条件では１２０ｍｍの剛軟度が得られる。極細繊維
の使用量は、不織布の全体重量に対して、多くとも６０
重量％を越えないように６０重量％以下で用いるのがよ
いが、自己融着性繊維や有機性難燃繊維の繊度によっ
て、あるいは目的とする捕集効率によって使用量は最適
化条件が選定されるものである。For example, the total areal weight is 100 g and the ultrafine fibers are 8
A bending resistance of 150 mm can be obtained under the conditions of using 30 g of polyester fibers having a diameter of μm and 70 g of self-bonding fibers made of polyester and having a fineness of 4 denier. Also, the total basis weight 11
0 g, 20 g of acrylic fibers having ultrafine fibers of 3.4 μm, self-bonding fibers of copolyethylene having a fineness of 1.5 denier and polypropylene of 60 g, and organic organic flame-retardant fibers (modacrylic fibers) 2.4. Under the condition of using 30 g of denier, a bending resistance of 120 mm is obtained. The amount of ultrafine fibers used is at most 60, based on the total weight of the nonwoven fabric.
It is recommended to use not more than 60% by weight so as not to exceed 50% by weight. However, the amount of use should be optimized depending on the fineness of the self-bonding fiber or organic flame-retardant fiber, or the target collection efficiency. It is something.

【００２９】次にポアサイズについて説明すると、目付
範囲が３０〜２００ｇ／ｍ2 の濾材を用いてビル管理法
を満足する濾材を、長寿命に設計するためにはポアサイ
ズを適性化してダスト保持量を多くし、同時に捕集効率
をも満足させることが重要である。Next, the pore size will be described. In order to design a filter medium having a basis weight of 30 to 200 g / m 2 and satisfying the building management method to have a long life, the pore size is optimized and the dust holding amount is reduced. At the same time, it is important to satisfy the collection efficiency at the same time.

【００３０】ポアサイズが１５０μｍより大きいと一定
圧力損失に達するまでに捕集できるダスト保持量が増え
長寿命化を達成できるが捕集効率を満足することが困難
となる。またポアサイズが３０μｍより小さいと捕集効
率を満足させることが可能であるが、一定圧力損失に達
するまでに捕集できるダスト保持量が減り長寿命化が達
成できない。従って、長寿命化と捕集効率の両方を満足
できる好ましい範囲は同じ繊維密度の不織布構造では３
０〜１５０μｍ範囲である。好適には、５０〜１３０μ
ｍ範囲である。ポアサイズの求め方は英国のＣＯＵＬＴ
ＥＲＥＬＥＣＴＲＯＮＩＣＳ ＬＩＭＩＴＥＤのＰＯＲ
ＯＭＥＴＥＲ IIを用いて評価するものである。具体的
方法は、評価試料１０ｃｍ角の試料より縦横それぞれ２
ｃｍ置きに５点×５点＝計２５個のポイントを試料評価
面積０．１９６ｃｍ2 で、使用液体はポロフイルを用い
て評価し、個々平均ポアサイズを求める、次いで全体の
平均ポアサイズを求めるものである。If the pore size is larger than 150 μm, the amount of dust that can be collected before reaching a certain pressure loss increases and a long life can be achieved, but it becomes difficult to satisfy the collection efficiency. If the pore size is less than 30 μm, the trapping efficiency can be satisfied, but the amount of dust that can be trapped by the time the constant pressure loss is reached is reduced and the life cannot be extended. Therefore, the preferable range that can satisfy both the long life and the collection efficiency is 3 in the case of the non-woven fabric structure having the same fiber density.
It is in the range of 0 to 150 μm. Suitably, 50 to 130 μ
m range. How to obtain pore size is COUNT in UK
ERELECTRONICS LIMITED POR
It is evaluated using OMETER II. The specific method is to measure 2 cm in each length and width from the 10 cm square sample.
5 points x 5 points per cm = a total of 25 points with a sample evaluation area of 0.196 cm 2 , the liquid used was evaluated using a porofil, the individual average pore size was determined, and then the overall average pore size was determined. .

【００３１】なお、少なくともエレクトレット化された
極細繊維または自己融着性繊維を濾材の一部に用いた場
合には、低圧力損失で捕集効率の向上が図れるので好ま
しい。この場合には捕集効率が向上するのでポアサイズ
の適性範囲を拡大してもよく、３０〜２５０μｍ範囲で
も十分に捕集効率を満足させることが可能となる。In addition, it is preferable to use at least electretized ultrafine fibers or self-bonding fibers as a part of the filter medium because the collection efficiency can be improved with a low pressure loss. In this case, since the collection efficiency is improved, the appropriate range of pore size may be expanded, and the collection efficiency can be sufficiently satisfied even in the range of 30 to 250 μm.

【００３２】次に有機性難燃繊維について説明すると、
限界酸素指数（ＬＯＩ）、（測定法ＪＩＳ Ｋ７２０
１）が２５以上の有機難燃繊維が使用されるものであ
る。これは、ガラスなどの無機あるいは石綿繊維などの
場合には一緒に用いられる他の繊維を難燃化するために
は多くの量を必要とし、また繊維長が短く嵩高化が困難
である。これに対して有機繊維の場合には燃焼に伴って
収縮が発生しやすく、火源から遠ざかる現象があり難燃
性を少ない使用量で得られやすい。また、この効果はポ
アサイズが３０〜１５０μｍの範囲の嵩高な構造で得ら
れやすく適する。Next, the organic flame-retardant fiber will be described.
Limiting oxygen index (LOI), (Measuring method JIS K720
In 1), an organic flame-retardant fiber having 25 or more is used. This requires a large amount in order to make other fibers used together with inorganic fibers such as glass or asbestos fibers flame-retardant, and the fiber length is short and bulking is difficult. On the other hand, in the case of organic fibers, shrinkage is likely to occur due to combustion, and there is a phenomenon of moving away from the fire source, and flame retardance is easily obtained with a small amount used. In addition, this effect is easily obtained with a bulky structure having a pore size in the range of 30 to 150 μm and is suitable.

【００３３】さらに難燃効果の高いものは、燃焼によっ
て消化性ガスを発生する塩化ビニル、塩化ビニリデン、
ポリクラール、モダクリル、ハロゲンやリン系難燃剤な
どを含む難燃性ポリエステルなどの素材や難燃加工され
た天然繊維、例えばプロバン加工された綿やサブロ加工
された羊毛などであり、燃焼によって消火性ガスが燃焼
部分を覆うので高い難燃性が得られ好適素材である。こ
れらを全体目付に対し１０〜５０重量％用いることで目
的を達成できるもである。（難燃性試験法；ＪＩＳ Ｌ
１０９１Ａ−１法）中でも塩化ビニリデン、ポリクラー
ル、モダクリル繊維の繊度５デニール以下、ＬＯＩ２７
〜５６範囲の繊維が少量で難燃化できるので特に好まし
い。Further, those having a high flame retardant effect include vinyl chloride, vinylidene chloride, which produces digestive gas by combustion,
Materials such as polyclar, modacrylic, flame-retardant polyester containing halogen and phosphorus-based flame retardants, etc., and flame-retarded natural fibers such as Provan-processed cotton and Saburo-processed wool. Since it covers the burning part, it is a suitable material because it has high flame retardancy. The purpose can be achieved by using these in an amount of 10 to 50% by weight based on the total weight. (Flame retardancy test method; JIS L
1091A-1 method) Among them, vinylidene chloride, polyclar, modacrylic fiber fineness of 5 denier or less, LOI 27
Fibers in the range of to 56 can be flame-retarded with a small amount, which is particularly preferable.

【００３４】次に、捕集効率の高い濾材、例えば比色法
９０％品で長寿命濾材を得るためには、本発明の良好な
プリーツ加工適性を有する難燃性濾材の、空気流れの最
下流側にメルトブロー不織布あるいはエレクトレット化
メルトブロー不織布の捕集効率３０〜８８％範囲、厚み
０．５ｍｍ以下のものを積層する方法で、全体のプリー
ツ加工性と難燃性さらに長寿命化を図った濾材を得るこ
とができる。Next, in order to obtain a long-life filter medium having a high collection efficiency, for example, a 90% colorimetric product, the flame-retardant filter medium of the present invention having a good pleating property has the highest air flow. A filter material having a whole pleating processability, flame retardancy, and a long life by a method of laminating a melt blown nonwoven fabric or an electretized melt blown nonwoven fabric having a collection efficiency in the range of 30 to 88% and a thickness of 0.5 mm or less on the downstream side. Can be obtained.

【００３５】一体化の方法は、部分超音波接着や熱接着
あるいは本発明の濾材に用いた自己融着性繊維を用いて
接着することが可能である。As a method of integration, partial ultrasonic bonding, heat bonding, or self-bonding fibers used in the filter material of the present invention can be used for bonding.

【００３６】[0036]

【実施例】実施例をもって更に詳細に本発明を説明す
る。The present invention will be described in more detail with reference to Examples.

【００３７】実施例１ 全体目付１００ｇ／ｍ2 、極細繊維が８μｍのポリエス
テル短繊維２０ｇ／ｍ2 と自己融着性短繊維（芯鞘型繊
維：４デニール、芯；ポリエステル、鞘；共重合ポリエ
ステル融点８５℃）を５５ｇ／ｍ2 、さらに難燃性短繊
維（モダクリル繊維、ＬＯＩ３２）２．４デニールを２
５ｇ／ｍ2 からなるニードルパンチ不織布を９０℃で加
熱して繊維どうしを融着させて、ポアサイズが９０μｍ
である不織布を製造した。このものの剛軟度は、１５０
ｍｍで良好なプリーツ加工性を満足するものであった。
この不織布を使用して濾材を作った。なおこの濾材の捕
集効率は、０．８μｍポリスチレン粒子に対し３０％、
圧力損失は０．８ｍｍＡｑであった（測定風速５ｍ／ｍ
ｉｎ）。Example 1 20 g / m 2 of polyester short fibers having a total basis weight of 100 g / m 2 and ultrafine fibers of 8 μm and self-bonding short fibers (core-sheath type fiber: 4 denier, core; polyester, sheath; copolyester) 55 g / m 2 at a melting point of 85 ° C., and 2 denier of 2.4 flame-retardant short fibers (modacrylic fiber, LOI32)
The needle punched non-woven fabric composed of 5 g / m 2 is heated at 90 ° C. to fuse the fibers together, and the pore size is 90 μm.
Was produced. The bending resistance of this product is 150
In mm, good pleating workability was satisfied.
A filter medium was made using this non-woven fabric. The collection efficiency of this filter medium was 30% with respect to 0.8 μm polystyrene particles,
The pressure loss was 0.8 mmAq (measured wind speed 5 m / m
in).

【００３８】難燃性（ＪＩＳ Ｌ１０９１Ａ−１法）も
目標を満足する区分３が得られた。さらにこの濾材のダ
スト保持量をアシュレ５２−７６の評価方法に準じて下
記条件で評価した。Category 3 was obtained in which the flame retardancy (JIS L1091A-1 method) also satisfied the target. Further, the dust holding amount of this filter medium was evaluated under the following conditions according to the evaluation method of Asure 52-76.

【００３９】評価条件は、下記の通りである。The evaluation conditions are as follows.

【００４０】 試料面積＝１２０ｃｍ2 （シート状態）、 測定風速＝５ｍ／ｍｉｎ、 ダスト＝ＪＩＳ１５種、 最終圧力損失＝初期圧力損失＋５ｍｍＡｑ、 ダスト濃度＝８０ｍｇ／ｍ3 ±１０％。Sample area = 120 cm 2 (sheet state), measurement wind speed = 5 m / min, dust = JIS15, final pressure loss = initial pressure loss + 5 mmAq, dust concentration = 80 mg / m 3 ± 10%.

【００４１】測定の結果、１４ｇ／ｍ2 のダスト付着量
であった。As a result of the measurement, the dust adhesion amount was 14 g / m 2 .

【００４２】実施例２ 全体目付１１０ｇ／ｍ2 、極細短繊維＝繊維直径３．４
μｍのアクリル短繊維２５ｇ／ｍ2 、自己融着性短繊維
（芯鞘型繊維：繊度１．５デニール、芯；共重合ポリエ
チレン、鞘；ポリプロピレン、融点９８℃）を５５ｇ／
ｍ2 、さらに難燃性短繊維（モダクリル繊維、ＬＯＩ値
３６）１．５デニールを３０ｇ／ｍ2 含んでなるニード
ルパンチ不織布を加熱圧縮したポアサイズ７０μｍの接
着された濾材は、１２０ｍｍの剛軟度を有し、難燃性
（ＪＩＳ Ｌ１０９１Ａ−１法）も目標を満足する区分
３が得られた。Example 2 Total basis weight 110 g / m 2 , ultrafine short fibers = fiber diameter 3.4
25 g / m 2 of acrylic short fiber of μm, self-bonding short fiber (core-sheath type fiber: fineness of 1.5 denier, core; copolyethylene, sheath; polypropylene, melting point 98 ° C.) 55 g /
m 2 and needle-punched non-woven fabric containing 30 g / m 2 of flame-retardant short fibers (modacrylic fiber, LOI value 36) of 1.5 denier were heated and compressed, and the bonded filter medium with a pore size of 70 μm had a bending resistance of 120 mm. And the flame retardancy (JIS L1091A-1 method) was satisfied, and Category 3 was obtained.

【００４３】なお、この濾材の初期捕集効率は、０．８
μｍポリスチレン粒子に対し２５％、圧力損失は１．０
ｍｍＡｑであった（測定風速５ｍ／ｍｉｎ）。The initial collection efficiency of this filter medium was 0.8.
25% for μm polystyrene particles, pressure loss 1.0
It was mmAq (measured wind speed 5 m / min).

【００４４】さらにこの濾材のダスト保持量を実施例１
の方法で評価したところ、１３ｇ／ｍ2 のダスト付着量
であった。この値は、実使用条件で７０００時間に相当
するダスト付着量を示すものであった。Furthermore, the dust holding amount of this filter medium was determined as in Example 1.
When evaluated by the above method, the amount of dust attached was 13 g / m 2 . This value shows the dust adhesion amount corresponding to 7,000 hours under actual use conditions.

【００４５】実施例３ 全体目付１００ｇ／ｍ2 、極細繊維が７μｍのエレクト
レット化ポリプロピレン短繊維１５ｇ／ｍ2 と自己融着
性短繊維（芯鞘型繊維：繊度４デニール、芯；ポリエス
テル、鞘；共重合ポリエステル融点８５℃）６０ｇ／ｍ
2 、さらに難燃性短繊維（ポリクロラール繊維；ＬＯＩ
値２８）４デニールを２５ｇ／ｍ2 からなる不織布を９
０℃で加熱して繊維どうしを融着させてポアサイズが１
００μｍである不織布を製造した。このものの剛軟度は
１３０ｍｍで剛性を満足するものであった。この不織布
を用いて濾材を形成した。難燃性（ＪＩＳ Ｌ１０９１
Ａ−１法）も目標を満足する区分３が得られた。また、
この濾材の捕集効率は、０．８μｍポリスチレン粒子に
対し７５％、圧力損失は０．７０ｍｍＡｑでありエレク
トレットの効果が確認された（測定風速５ｍ／ｍｉ
ｎ）。さらにこの濾材のダスト保持量を実施例１の方法
で評価したところ１８ｇ／ｍ2 のダスト付着量であっ
た。エレクトレット短繊維を用いて捕集効率とポアサイ
ズを高めた結果による。Example 3 15 g / m 2 of electretized polypropylene short fibers having a total basis weight of 100 g / m 2 and ultrafine fibers of 7 μm and self-bonding short fibers (core-sheath type fiber: fineness 4 denier, core; polyester, sheath; Copolymerized polyester melting point 85 ° C) 60 g / m
2 , more flame-retardant short fibers (polychloral fiber; LOI
Value 28) 4 denier non-woven fabric consisting of 25 g / m 2
Heat at 0 ° C to fuse the fibers together and the pore size becomes 1
A non-woven fabric having a size of 00 μm was produced. The bending resistance of this product was 130 mm, which satisfied the rigidity. A filter medium was formed using this non-woven fabric. Flame retardance (JIS L1091
Category 3 satisfying the target was obtained also in the (A-1 method). Also,
The collection efficiency of this filter medium was 75% with respect to 0.8 μm polystyrene particles, and the pressure loss was 0.70 mmAq, confirming the effect of the electret (measured wind speed 5 m / mi).
n). Further, when the dust retention amount of this filter medium was evaluated by the method of Example 1, it was found that the dust attachment amount was 18 g / m 2 . This is based on the results of increasing the collection efficiency and pore size using short electret fibers.

【００４６】実施例４ 実施例２の不織布の下流側にエレクトレット化ポリプロ
ピレンメルトブロー不織布（繊維径１．８μｍ、目付２
０ｇ／ｍ2 、厚み０．２ｍｍ、ポアサイズ１８μｍ、剛
軟度３０ｍｍ）を積層した。この濾材の捕集効率は、
０．８μｍポリスチレン粒子に対し８８％、圧力損失は
１．３ｍｍＡｑでありエレクトレットの効果が確認され
た（測定風速５ｍ／ｍｉｎ）。Example 4 Electretized polypropylene meltblown nonwoven fabric (fiber diameter 1.8 μm, basis weight 2) was provided on the downstream side of the nonwoven fabric of Example 2.
0 g / m 2 , thickness 0.2 mm, pore size 18 μm, bending resistance 30 mm) were laminated. The collection efficiency of this filter medium is
88% with respect to 0.8 μm polystyrene particles, the pressure loss was 1.3 mmAq, and the effect of the electret was confirmed (measured wind speed 5 m / min).

【００４７】さらに、この濾材のダスト保持量を実施例
１の方法で評価したところ１２ｇ／ｍ2 のダスト付着量
であった。エレクトレットシートを用いてもダスト付着
量が多くかつ捕集効率も高いものであった。Further, when the amount of dust held by this filter medium was evaluated by the method of Example 1, it was found that the amount of dust attached was 12 g / m 2 . Even with the electret sheet, the amount of dust attached was large and the collection efficiency was high.

【００４８】比較例１ 実施例１の内容で下記条件を変更した濾材を作成した。
すなわち、全体目付１００ｇ／ｍ2 、極細繊維が８μｍ
のポリエステル短繊維６０ｇ／ｍ2 と自己融着性短繊維
（芯鞘型繊維：繊度４デニール、芯；ポリエステル、
鞘；共重合ポリエステル融点８５℃）を１５ｇ／ｍ2 、
さらに難燃性短繊維（モダクリル繊維；ＬＯＩ値３２）
２．４デニールを２５ｇ／ｍ2 からなるからなる不織布
を９０℃で加熱して繊維どうしを融着させてポアサイズ
が９０μｍである不織布を製造した。このものの剛軟度
は２５ｍｍで剛性を満足しないものであった。これは、
自己融着性繊維の使用量が少なすぎる結果であった。Comparative Example 1 A filter medium was prepared by changing the following conditions in the same manner as in Example 1.
That is, the total areal weight is 100 g / m 2 , and the ultrafine fibers are 8 μm.
60 g / m 2 of polyester short fibers and self-bonding short fibers (core-sheath type fiber: fineness 4 denier, core; polyester,
Sheath; copolymerized polyester melting point 85 ° C.) 15 g / m 2 ,
Further flame-retardant short fibers (modacrylic fiber; LOI value 32)
A nonwoven fabric composed of 25 g / m 2 of 2.4 denier was heated at 90 ° C. to fuse the fibers together to produce a nonwoven fabric having a pore size of 90 μm. The bending resistance of this product was 25 mm, which did not satisfy the rigidity. this is,
The result was that the amount of self-bonding fibers used was too small.

【００４９】比較例２ 実施例２の内容で下記条件を変更した濾材を作成した。
すなわち、全体目付１１０ｇ／ｍ2 、極細繊維が３．４
μｍのアクリル短繊維２５ｇ／ｍ2 、自己融着性短繊維
（繊度１．５デニール、芯；共重合ポリエチレン、鞘；
ポリプロピレン、融点９８℃）を７５ｇ／ｍ2 、さらに
難燃性短繊維（モダクリル繊維；ＬＯＩ値２７）２．４
デニールを１０ｇ／ｍ2 用いて、ポアサイズ７０μｍの
接着された濾材である。この濾材は１４０ｍｍの剛軟度
を有していたが、難燃性（ＪＩＳＬ１０９１Ａ−１法）
は目標を満足しない区分１であった。これは、有機難燃
繊維の使用量が少なすぎる結果である。Comparative Example 2 A filter medium was prepared in the same manner as in Example 2, except that the following conditions were changed.
That is, the total basis weight is 110 g / m 2 , and the ultrafine fibers are 3.4.
25 g / m 2 of acrylic short fibers of μm, self-bonding short fibers (fineness: 1.5 denier, core; copolymerized polyethylene, sheath;
Polypropylene, melting point 98 ° C.) 75 g / m 2 , flame-retardant short fibers (modacrylic fiber; LOI value 27) 2.4
A bonded filter medium having a pore size of 70 μm and a denier of 10 g / m 2 . Although this filter medium had a bending resistance of 140 mm, it was flame-retardant (JISL1091A-1 method).
Was Category 1 which did not meet the target. This is a result of using too little organic flame retardant fiber.

【００５０】比較例３ 実施例２の内容で下記条件を変更した濾材を作成した。
すなわち、全体目付１１０ｇ／ｍ2 、極細繊維が３．４
μｍのアクリル短繊維２５ｇ／ｍ2 、自己融着性短繊維
（繊度１．５デニール、芯；共重合ポリエチレン、鞘；
ポリプロピレン、融点９８℃）を５５ｇ／ｍ2 、さらに
難燃性短繊維（モダクリル繊維ＬＯＩ値３６）２．４デ
ニールを３０ｇ／ｍ2 用いて、ポアサイズ１８μｍで接
着された濾材である。該濾材は、２５０ｍｍの剛軟度を
有し、難燃性（ＪＩＳ Ｌ１０９１Ａ−１法）も目標を
満足する区分３が得られた。Comparative Example 3 A filter medium was prepared by changing the following conditions in the same manner as in Example 2.
That is, the total basis weight is 110 g / m 2 , and the ultrafine fibers are 3.4.
25 g / m 2 of acrylic short fibers of μm, self-bonding short fibers (fineness: 1.5 denier, core; copolymerized polyethylene, sheath;
It is a filter medium having a pore size of 18 μm and using polypropylene (melting point 98 ° C.) 55 g / m 2 and flame-retardant short fiber (modacrylic fiber LOI value 36) 2.4 denier 30 g / m 2 . The filter medium had a bending resistance of 250 mm and was classified into Category 3 in which flame retardancy (JIS L1091A-1 method) also satisfied the target.

【００５１】捕集効率は５５％で、圧力損失は４ｍｍＡ
ｑであった。さらにこの濾材のダスト保持量を実施例１
と同一条件で評価した結果３．５ｇ／ｍ2のダスト付着
量で極めて少ないダスト付着量であった。これはポアサ
イズが小さすぎる結果であった。Collection efficiency is 55% and pressure loss is 4 mmA.
It was q. Furthermore, the dust holding amount of this filter medium was determined as in Example 1.
As a result of evaluation under the same conditions as above, the dust adhesion amount of 3.5 g / m 2 was an extremely small dust adhesion amount. This was a result of the pore size being too small.

【００５２】比較例４ 繊度２．４デニールのモダクリル短繊維不織布（ＬＯＩ
値２７）４０ｇ／ｍ2 を剛性難燃樹脂（塩化ビニルと酢
酸ビニル）で加工した粗構造の濾材（目付８４ｇ／
ｍ2 、厚み０．６ｍｍ、ポアサイズ２８４μｍ）にメル
トブロー不織布（繊維径１．８μｍ、目付３０ｇ／
ｍ2 、厚み０．２ｍｍ、ポアサイズ１８μｍ）を積層し
た。この濾材の捕集効率は、０．８μｍポリスチレン粒
子に対し３５％、圧力損失は２．４ｍｍＡｑであった
（測定風速５ｍ／ｍｉｎ）。この濾材のダスト保持量を
粗構造側を上流側として実施例１と同一条件で評価した
結果、４ｇ／ｍ2 のダスト付着量であった。Comparative Example 4 Modacrylic short fiber non-woven fabric (LOI having a fineness of 2.4 denier)
(Value 27) 40g / m 2 processed with rigid flame-retardant resin (vinyl chloride and vinyl acetate)
m 2 , thickness 0.6 mm, pore size 284 μm, melt blown nonwoven fabric (fiber diameter 1.8 μm, basis weight 30 g /
m 2 , thickness 0.2 mm, pore size 18 μm) were laminated. The collection efficiency of this filter medium was 35% with respect to 0.8 μm polystyrene particles, and the pressure loss was 2.4 mmAq (measured wind speed 5 m / min). The dust holding amount of this filter medium was evaluated under the same conditions as in Example 1 with the rough structure side being the upstream side, and the result was a dust adhesion amount of 4 g / m 2 .

【００５３】これは上流側のポアサイズが大き過ぎるこ
とと、メルトブロー不織布のポアサイズが小さすぎるた
めであった。This was because the pore size on the upstream side was too large and the pore size of the meltblown nonwoven fabric was too small.

【００５４】比較例５ メルトブロー不織布（繊維径１．８μｍ、目付３０ｇ／
ｍ2 、厚み０．２ｍｍ、ポアサイズ１８μｍ、剛軟度３
０ｍｍ）この濾材の捕集効率は、０．８μｍポリスチレ
ン粒子に対し３０％、圧力損失は１．８ｍｍＡｑであっ
た（測定風速５ｍ／ｍｉｎ）。Comparative Example 5 Melt blown non-woven fabric (fiber diameter 1.8 μm, basis weight 30 g /
m 2 , thickness 0.2 mm, pore size 18 μm, bending resistance 3
(0 mm) The collection efficiency of this filter medium was 30% with respect to 0.8 μm polystyrene particles, and the pressure loss was 1.8 mmAq (measured wind speed 5 m / min).

【００５５】この濾材のダスト保持量を実施例１と同一
条件で評価した結果、２ｇ／ｍ2 のダスト付着量で極め
て少ないものであった。これはポアサイズが小さいため
である。As a result of evaluating the dust holding amount of this filter medium under the same conditions as in Example 1, the dust adhering amount of 2 g / m 2 was extremely small. This is because the pore size is small.

【００５６】[0056]

【発明の効果】本発明の効果は、ビル管理法に適合する
長寿命濾材を繊維の構成、すなわち極細繊維と自己融着
性繊維および有機性難燃繊維の構成で作成するものであ
る。The effect of the present invention is to produce a long-life filter material that complies with the building management method with a fiber structure, that is, a structure of ultrafine fibers, self-bonding fibers and organic flame-retardant fibers.

【００５７】従来の空調用濾材の加工法が、不織布１層
の剛性難燃樹脂で加工した濾材、あるいは不織布１層の
剛性難燃樹脂で加工した粗構造の濾材に密なメルトブロ
ー不織布を接着して捕集効率を高めた濾材などが知られ
ている。従来の樹脂加工品ではダストを保持する空間が
樹脂で覆われて失われるためダスト保持量が少なく寿命
も短いものであった。また、上流側の粗構造濾材の捕集
効率が低いため、緻密なメルトブロー不織布層に高濃度
のダストがそのまま到達するので圧力損失上昇が早く寿
命が短いものであったが、本発明では、極細繊維を使用
することで高い捕集効率を、また剛性は自己融着性繊維
の融着化・固定化によって、さらに難燃性は有機性難燃
繊維によって、それぞれ機能を分離して全体を適性なポ
アサイズに構成した結果、その効果は、高い難燃性と初
期より高い捕集効率が得られ、ダストを保持する有効気
孔容積が大きいため長寿命化が実現できたものである。A conventional method for processing air-conditioning filter media is one in which a dense melt-blown non-woven fabric is adhered to a filter media processed with one layer of non-woven fabric of rigid flame-retardant resin or a coarse-structured filter media processed with one layer of non-woven fabric of rigid flame-retardant resin. There are known filter media and the like that have improved collection efficiency. In the conventional resin processed product, the space for holding the dust is covered with the resin and is lost, so the amount of dust held is small and the life is short. Further, since the collection efficiency of the coarse structure filter medium on the upstream side is low, a high concentration of dust reaches the dense meltblown nonwoven fabric layer as it is, so the pressure loss rises quickly and the life is short, but in the present invention, it is extremely fine. High collection efficiency by using fibers, rigidity by fusion / fixation of self-bonding fibers, and flame retardancy by organic flame-retardant fibers, each function is separated to suit the whole As a result of the large pore size, the effect is that high flame retardancy and higher collection efficiency than the initial stage are obtained, and the effective pore volume for holding dust is large, so that the life can be extended.

【００５８】このため、本発明の良好なプリーツ加工性
を有する難燃性濾材は、風圧に耐えるプリーツ（山谷折
り）と高い難燃性さらに低い通気抵抗と長寿命性を有し
ているので、濾材をプリーツ加工して、あるいは平面で
収納されたフィルターユニットに利用できるものであ
り、難燃性も高いので延焼を防止する効果の高いもので
ある。Therefore, the flame-retardant filter medium of the present invention having good pleating workability has pleats (mountain valley folds) to withstand wind pressure, high flame retardancy, low ventilation resistance and long life. The filter material can be used by pleating the filter material or can be used for a filter unit housed in a flat surface. Since it has high flame retardancy, it is highly effective in preventing fire spread.

【００５９】このため各種ビル空調用やＡＨＵ用フィル
ターユニット、ロングライフフィルターユニット、プリ
ンター用フィルターユニット、精密機器用フィルターユ
ニット、粗塵フィルター、中、高性能フィルター、自動
車用フィルターなどのエアーフィルターを中心に好適に
使用できる。For this reason, air filters such as filter units for various building air conditioners and AHUs, long life filter units, filter units for printers, filter units for precision equipment, coarse dust filters, medium and high performance filters, automobile filters, etc. Can be suitably used.

【００６０】また、液体フィルターとしてはオイルフィ
ルターや水系フィルター、溶剤用フィルターなどで粒子
径０．１ミクロン以上の粒子の分離用に好適に使用でき
るものである。As the liquid filter, an oil filter, an aqueous filter, a solvent filter or the like can be suitably used for separating particles having a particle diameter of 0.1 micron or more.

Claims (7)

【特許請求の範囲】[Claims] 【請求項１】単糸繊維直径１０μｍ未満の極細短繊維
と、３０〜８０重量％の自己融着性繊維および１０〜５
０重量％のＬＯＩ値２５以上の有機難燃繊維の少なくと
も三者の繊維をランダムに含み、かつ構成繊維どうしが
前記自己融着性繊維によって部分的に接着されたポアサ
イズが３０〜１５０μｍ、剛軟度が１００ｍｍ以上であ
る不織布からなる濾材。1. Ultrafine short fibers having a diameter of less than 10 μm, 30-80% by weight of self-bonding fibers, and 10-5.
0% by weight of at least three kinds of organic flame-retardant fibers having a LOI value of 25 or more are randomly contained, and the constituent fibers are partially adhered by the self-bonding fibers, and the pore size is 30 to 150 μm, and the fibers are flexible. A filter medium made of a non-woven fabric having a degree of 100 mm or more. 【請求項２】単糸繊維直径１０μｍ未満の極細短繊維が
開繊されてなることを特徴とする請求項１記載の濾材。2. The filter medium according to claim 1, wherein ultrafine short fibers having a diameter of a single yarn fiber of less than 10 μm are opened. 【請求項３】有機難燃繊維が消火性ガスを発生するもの
であることを特徴とする請求項１記載の濾材。3. The filter medium according to claim 1, wherein the organic flame-retardant fiber generates a fire-extinguishing gas. 【請求項４】自己融着性繊維が芯鞘型複合繊維であり、
芯部と鞘部の融点差が３０℃以上であり、かつ少なくと
も芯素材がポリエステル系ポリマーを含むものであるこ
とを特徴とする請求項１記載の濾材。4. The self-bonding fiber is a core-sheath type composite fiber,
2. The filter medium according to claim 1, wherein the melting point difference between the core portion and the sheath portion is 30 [deg.] C. or higher, and at least the core material contains a polyester polymer. 【請求項５】単糸繊維直径１０μｍ未満の極細短繊維
と、３０〜８０重量％の自己融着性繊維および１０〜５
０重量％のＬＯＩ値２５以上の有機難燃繊維の少なくと
も三者の繊維をランダムに含み、かつ該極細繊維、自己
融着性繊維および有機難燃繊維の少なくともいずれかが
エレクトレット化繊維であり、構成繊維どうしが前記自
己融着性繊維によって部分的に接着されたポアサイズが
３０〜２５０μｍ、剛軟度が１００ｍｍ以上である不織
布からなる濾材。5. Single-filament fibers Ultrafine short fibers having a diameter of less than 10 μm, 30 to 80% by weight of self-bonding fibers and 10 to 5
Randomly containing at least three fibers of 0% by weight of an organic flame-retardant fiber having a LOI value of 25 or more, and at least one of the ultrafine fiber, the self-bonding fiber and the organic flame-retardant fiber is an electretized fiber, A filter medium comprising a nonwoven fabric having a pore size of 30 to 250 μm and a bending resistance of 100 mm or more in which constituent fibers are partially bonded by the self-bonding fiber. 【請求項６】メルトブロー不織布が積層され接着されて
なることを特徴とする請求項１、２、３、４または５記
載の濾材。6. The filter medium according to claim 1, wherein the meltblown nonwoven fabric is laminated and adhered. 【請求項７】エレクトレット化メルトブロー不織布が積
層接着されていることを特徴とする請求項１、２、３、
４、５または６記載の濾材。7. An electretized meltblown non-woven fabric is laminated and adhered,
The filter medium according to 4, 5, or 6.
JP3194383A 1991-08-02 1991-08-02 Filter medium having pleating property and fire retardant property Pending JPH0531310A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3194383A JPH0531310A (en) 1991-08-02 1991-08-02 Filter medium having pleating property and fire retardant property

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3194383A JPH0531310A (en) 1991-08-02 1991-08-02 Filter medium having pleating property and fire retardant property

Publications (1)

Publication Number Publication Date
JPH0531310A true JPH0531310A (en) 1993-02-09

Family

ID=16323689

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3194383A Pending JPH0531310A (en) 1991-08-02 1991-08-02 Filter medium having pleating property and fire retardant property

Country Status (1)

Country Link
JP (1) JPH0531310A (en)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5709735A (en) * 1995-10-20 1998-01-20 Kimberly-Clark Worldwide, Inc. High stiffness nonwoven filter medium
US5839643A (en) * 1996-06-17 1998-11-24 Kabushiki Kaisha Yutaka Giken Method of weld-recoulping front cover and pump shell of torque converter
JP2002058929A (en) * 2000-08-23 2002-02-26 Tonen Tapyrus Co Ltd Filter for cleaning air
JP2006116522A (en) * 2004-09-22 2006-05-11 Japan Vilene Co Ltd Filter element
JP2006233358A (en) * 2005-02-24 2006-09-07 Shinwa Kk Reinforcing material for air filter
JP2010234285A (en) * 2009-03-31 2010-10-21 Toray Ind Inc Filter medium for air filter
JP2012092844A (en) * 2005-02-04 2012-05-17 Donaldson Co Inc Aerosol separator, and method
JP2014518339A (en) * 2011-06-30 2014-07-28 スリーエム イノベイティブ プロパティズ カンパニー Non-woven electret fiber web and method for producing the same
JP2015044325A (en) * 2013-08-27 2015-03-12 王子ホールディングス株式会社 Decorative molded body and method for producing decorative molded body
JP2016176173A (en) * 2015-03-18 2016-10-06 東レ株式会社 Ultrafine fiber sheet
JP2017008475A (en) * 2010-10-14 2017-01-12 フェアテック インヴェストメント リミテッド Needle-punch felt fabric of nonwoven fabric, method for producing the same, and filter made by using the same
JP2020165023A (en) * 2019-03-29 2020-10-08 東洋アルミエコープロダクツ株式会社 Non-woven fabric and filter using the same
JPWO2019065807A1 (en) * 2017-09-29 2020-11-05 東洋アルミエコープロダクツ株式会社 Non-woven fabric, filter using this, and manufacturing method of non-woven fabric
CN113215729A (en) * 2021-05-06 2021-08-06 常州百朋纺织有限公司 Environment-friendly dry-method framework cloth and manufacturing process thereof

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5709735A (en) * 1995-10-20 1998-01-20 Kimberly-Clark Worldwide, Inc. High stiffness nonwoven filter medium
US5839643A (en) * 1996-06-17 1998-11-24 Kabushiki Kaisha Yutaka Giken Method of weld-recoulping front cover and pump shell of torque converter
JP2002058929A (en) * 2000-08-23 2002-02-26 Tonen Tapyrus Co Ltd Filter for cleaning air
JP4512242B2 (en) * 2000-08-23 2010-07-28 タピルス株式会社 Air cleaning filter
JP2006116522A (en) * 2004-09-22 2006-05-11 Japan Vilene Co Ltd Filter element
JP4627447B2 (en) * 2004-09-22 2011-02-09 日本バイリーン株式会社 Filter element
JP2012092844A (en) * 2005-02-04 2012-05-17 Donaldson Co Inc Aerosol separator, and method
JP2006233358A (en) * 2005-02-24 2006-09-07 Shinwa Kk Reinforcing material for air filter
JP4648725B2 (en) * 2005-02-24 2011-03-09 シンワ株式会社 Reinforcing material for air filter material
JP2010234285A (en) * 2009-03-31 2010-10-21 Toray Ind Inc Filter medium for air filter
JP2017008475A (en) * 2010-10-14 2017-01-12 フェアテック インヴェストメント リミテッド Needle-punch felt fabric of nonwoven fabric, method for producing the same, and filter made by using the same
JP2014518339A (en) * 2011-06-30 2014-07-28 スリーエム イノベイティブ プロパティズ カンパニー Non-woven electret fiber web and method for producing the same
US9802187B2 (en) 2011-06-30 2017-10-31 3M Innovative Properties Company Non-woven electret fibrous webs and methods of making same
JP2015044325A (en) * 2013-08-27 2015-03-12 王子ホールディングス株式会社 Decorative molded body and method for producing decorative molded body
JP2016176173A (en) * 2015-03-18 2016-10-06 東レ株式会社 Ultrafine fiber sheet
JPWO2019065807A1 (en) * 2017-09-29 2020-11-05 東洋アルミエコープロダクツ株式会社 Non-woven fabric, filter using this, and manufacturing method of non-woven fabric
JP2020165023A (en) * 2019-03-29 2020-10-08 東洋アルミエコープロダクツ株式会社 Non-woven fabric and filter using the same
US11965274B2 (en) 2019-03-29 2024-04-23 Toyo Aluminium Ekco Products Co., Ltd. Non-woven fabric and filter using same
CN113215729A (en) * 2021-05-06 2021-08-06 常州百朋纺织有限公司 Environment-friendly dry-method framework cloth and manufacturing process thereof
CN113215729B (en) * 2021-05-06 2023-01-13 常州百朋纺织有限公司 Environment-friendly dry-method framework cloth and manufacturing process thereof

Similar Documents

Publication Publication Date Title
KR101463638B1 (en) Filter medium and filter unit
US7094270B2 (en) Composite filter and method of making the same
US9718020B2 (en) Waved filter media and elements
JPH0531310A (en) Filter medium having pleating property and fire retardant property
CA2224857C (en) Synthetic filter media and method for manufacturing same
AU2007356885B2 (en) Highly charged, charge stable nanofiber web
US11738295B2 (en) Filter media including flame retardant fibers
US6090469A (en) Mechanically interlocked and thermally fused staple fiber pleated and non-pleated webs
US20230330451A1 (en) Filter media, composites, and face mask systems using same
JPH0568824A (en) Flame-retardant filter medium and its production
JPH0568823A (en) Filter medium
WO1991014503A1 (en) Filter
JP3269103B2 (en) Flame retardant filter media
EP3519076A1 (en) Filter media including flame retardant fibers
US6811594B1 (en) Filter materials and methods for the production thereof
JPH06205915A (en) Composite sheet and its production
JPH05212225A (en) Fire-retardant filter medium and its production
JPH04346806A (en) Electret filter
WO2024137158A1 (en) Shirred filter media and methods of making and using the same
JPH11179121A (en) Substrate for filter and filter comprising substrate for filter
JPH09192427A (en) Filter medium for air cleaner and its production
US20240082763A1 (en) Filtration media and filters
JPH0568822A (en) Laminated filter medium for streamer type filter
AU765699B2 (en) Vacuum cleaner bag and improved vacuum cleaner bag