JP2004160394A - Surface filtration filter material having high efficiency and low pressure loss - Google Patents
Surface filtration filter material having high efficiency and low pressure loss Download PDFInfo
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- JP2004160394A JP2004160394A JP2002330620A JP2002330620A JP2004160394A JP 2004160394 A JP2004160394 A JP 2004160394A JP 2002330620 A JP2002330620 A JP 2002330620A JP 2002330620 A JP2002330620 A JP 2002330620A JP 2004160394 A JP2004160394 A JP 2004160394A
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- 239000000463 material Substances 0.000 title claims abstract description 23
- 238000001914 filtration Methods 0.000 title claims description 18
- 239000000835 fiber Substances 0.000 claims abstract description 90
- 239000004642 Polyimide Substances 0.000 claims abstract description 35
- 229920001721 polyimide Polymers 0.000 claims abstract description 35
- 125000003118 aryl group Chemical group 0.000 claims abstract description 34
- 239000004745 nonwoven fabric Substances 0.000 claims abstract description 28
- 239000004744 fabric Substances 0.000 claims abstract description 21
- 229920001410 Microfiber Polymers 0.000 claims abstract description 20
- 239000011230 binding agent Substances 0.000 claims abstract description 5
- 239000000470 constituent Substances 0.000 claims description 5
- 238000010030 laminating Methods 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 2
- 239000000428 dust Substances 0.000 abstract description 18
- 239000011248 coating agent Substances 0.000 abstract description 5
- 238000000576 coating method Methods 0.000 abstract description 5
- 238000010438 heat treatment Methods 0.000 abstract description 5
- 238000004080 punching Methods 0.000 abstract description 5
- 239000000126 substance Substances 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 35
- 230000000052 comparative effect Effects 0.000 description 12
- 238000000034 method Methods 0.000 description 6
- 238000009998 heat setting Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000010419 fine particle Substances 0.000 description 4
- 229920006015 heat resistant resin Polymers 0.000 description 4
- 239000002759 woven fabric Substances 0.000 description 4
- 238000003490 calendering Methods 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 239000004734 Polyphenylene sulfide Substances 0.000 description 2
- 238000009960 carding Methods 0.000 description 2
- 239000003365 glass fiber Substances 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 229920000069 polyphenylene sulfide Polymers 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 description 2
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 239000004760 aramid Substances 0.000 description 1
- 229920003235 aromatic polyamide Polymers 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 239000012209 synthetic fiber Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Nonwoven Fabrics (AREA)
- Filtering Materials (AREA)
- Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
Abstract
Description
【０００１】
【発明の属する技術分野】
本発明は表面濾過フィルター材に係り、詳しくは高温排ガス中のダスト、特に微粒子を捕集するための高効率低圧損の耐熱性フィルター材に関するものである。
【０００２】
【従来の技術】
従来から火力発電所の炉やごみ焼却炉等から排出される高温の燃焼排ガス中に含まれる微細粒子を除去するため集塵用フィルター材として多数の素材が提案され、例えばメタ芳香族ポリアミド繊維，ポリフェニレンサルファイド（ＰＰＳ）繊維，ガラス繊維，テフロン（登録商標）等の単独素材からなる織物や不織布、あるいは織物を基布としたもの、又は前記素材の組み合わせからなる織物や不織布あるいは織物を基布としたものが使用されて来た。
【０００３】
ところが、前記不織布タイプの耐熱性濾材は、その構成上、その表面濾過面を構成する繊維の繊維間空隙が大きく、また、毛羽立ち易いため、濾過時にダストが濾材内部に入り込み易く、ダストの払い落とし効果（ダスト剥離性）に難点があった。
従って、濾材が目詰まりし易く、経時的に圧力損失が高くなるという問題があった。
【０００４】
そこで、このような問題を解決するために、濾材を構成する不織布の表面の毛羽を毛焼処理したり、表面に耐熱性樹脂を含浸させたり、耐熱性樹脂をコーティングするなどして、ダストが前記濾材の内部に侵入することを防止することが考えられ、提案されて来た。
【０００５】
例えば、特開昭６１−１６０４６６号公報では、同公報に見られるように、四フッ化エチレン（ＰＴＦＥ）繊維に０．２〜０．４デニール（３．４〜４．７μｍ）の細かいガラス繊維を混入したニードル不織布が検討されている。
更に、該不織布の剥離性を改善した提案が特開平５−２４５３１６号公報によりなされている。
また、合成繊維からなる不織布の表面に四フッ化エチレン樹脂（ＰＴＦＥ）フィルムを延伸して得られる微細な細孔を有する薄膜（メンブレン）をラミネートした濾材も提供されており、ダスト捕集性，払い落とし性を改善した提案も特開平５−５７１１６号公報で見ることができる。
【０００６】
【発明が解決しようとする課題】
しかしながら、焼却炉，ボイラー等において燃焼に伴って生じるダストは、その燃焼温度が高くなるに従って細かくなり、前記従来例に見られるように不織布表面の毛羽を毛焼処理したり、耐熱樹脂を含浸又はコーティングする方法だけではダストに対する捕集効率は低いもので、充分な解決を見るには至らなかった。
【０００７】
本発明は上述の如き実状に対処し、このような問題を解決することを課題とするものであり、特に芳香族ポリイミド繊維の極細繊維の利用を試みることにより、極めて良好なダスト捕集性と耐熱性，強度，ダスト払い落とし性に優れた長寿命な高効率低圧損の表面濾過フィルター材を提供することを目的とするものである。
【０００８】
【課題を解決するための手段】
即ち、上記目的に適合する本発明は、芳香族ポリイミド繊維よりなる不織布であって、構成繊度が１．０デシテックス（ｄｔｅｘ）以下の極細芳香族ポリイミド繊維を２０ｗｔ％以上含有してなる繊維層を芳香族ポリイミド繊維繊維よりなる基布の少なくとも一面に積層し、互いに絡合すると共に、３００℃以上の温度で熱処理してなる高効率低圧損の表面濾過フィルター材の構成にある。
【０００９】
請求項２はより具体的な構成であり、芳香族ポリイミド繊維からなる不織布であって、構成繊度が１．０デシテックス以下の極細芳香族ポリイミド繊維を２０ｗｔ％以上含有し、通常太さの芳香族ポリイミド繊維と混繊してなる繊維層と、通常太さの芳香族ポリイミド繊維からなる繊維層を芳香族ポリイミド繊維からなる基布の両面に夫々積層し、交絡処理を施し、３００℃以上の高温で熱処理してなることを特徴とする。
ここで、上記の各構成において、芳香族ポリイミド繊維からなる不織布の上記極細繊維含有繊維層の表面又は全面に耐熱性バインダーをコーティングすることも効果的である。
【００１０】
上記高温熱処理を施すことにより極細繊維を含む繊維層側の表面の極細繊維が適度に緊張し表面が緻密で内面は厚さ方向に密度勾配を有するために濾過性能が優れる。
特に微細粒子を捕集する高効率低圧損でダストの剥離性がよい。更に、極細繊維層の側の表面に耐熱性のバインダーをコーティングすると、濾過性能をより向上することを可能とする。
【００１１】
【発明の実施の形態】
以下、更に本発明の具体的実施形態について詳述する。
本発明は前述の如く、耐熱性に優れた芳香族ポリイミド繊維を繊維層ならびに基布の構成に使用することを基本とする。
即ち、本発明に使用する基布は、芳香族ポリイミド繊維からなる織布又は編布で、繊維層も芳香族ポリイミド繊維からなる繊維層である。
特に繊維層は全部が芳香族ポリイミド繊維であるが、極細繊維１００ｗｔ％に限らず、芳香族ポリイミド繊維の通常太さの繊維と極細繊維の混繊からなる繊維層とすることも可能である。
この場合、混繊繊維層における極細繊維の成分量は２０ｗｔ％以上、とりわけ２０ｗｔ％〜８０ｗｔ％の範囲が好ましく、２０ｗｔ％以下では極細繊維の効果とする濾過特性を充分発揮することができない。
ここで芳香族ポリイミド繊維の通常太さの繊維としては、１デシテックスを超え、２〜５デシテックスの繊維が通常、用いられる。
【００１２】
そして、上述の基布と繊維との積層に際しては、極細繊維を含む繊維層を少なくとも基布の一面に積層することが必要である。
基布の両面に積層する場合、両面共、極細繊維を含む繊維層であってもよいが、極細繊維を含む繊維層を基布の一面に積層し、他面には通常太さの略２〜５デシテックスの芳香族ポリイミド繊維からなる繊維層を積層するようにしてもよい。
なお、繊維層に芳香族ポリイミド繊維を使用するときは、芳香族ポリイミド繊維は不規則な異形断面形状と適度な表面摩擦特性を有しているために製造工程での生産性が良好である。
【００１３】
次に上記の如く基布と繊維層とを積層すると、両者に対しニードルパンチ加工を施して交絡一体化する。
絡合処理を十分に行うことにより、繊維同志が互いに強固に絡み合った不織布を得ることができる。
そこで、更に随時、カレンダー処理をして厚さと繊維層の表面や内層の繊維を整えて後、３００℃以上の高温で乾燥熱処理を施すことにより、高温に安定なフィルター材製品が得られる。
【００１４】
高温の乾熱処理を施して得た上記製品は３００℃以上の高熱で処理されたため繊維層表面が緻密で均一な構造で内面は表面より稍粗い構造を示し、特に極細繊維を含有している繊維層は高温処理時に収縮を生じて適度な締まりのある安定な製品を得ることができる。従って、この構造が微粒子のダストを捕集しダスト払い落とし性も優れた濾過性能を有する製品を構成する。
更に、上記得られた製品において不織布の極細繊維層側に耐熱性のバインダーをコーティングすることで、より一層、濾過性能の向上が得られる。
【００１５】
【実施例】
次に、本発明の実施例及び比較例を示すが、本発明はこれら実施例に限定されるものではない。
なお、以下の実施例及び比較例における目付量，厚さ，通気度の測定，濾過性能の評価は下記の方法に従った。
【００１６】
目付量
ＪＩＳ Ｌ１０９６の８．４．２に記載の方法に準拠して求めた。
厚さ
ＪＩＳ Ｌ１０９６の８．５．１に記載の方法に従って荷重２ＫＰａで測定した。
通気度
ＪＩＳ Ｌ１０９６の６．２７．１に記載のフランジール形試験機で測定した。
【００１７】
濾布の評価
都市ゴミ焼却炉に用いられるバッグフィルター濾過集塵装置（ＮＫＫ株製「ボトムインレット」）用の濾布（直径１６４ｍｍ×長さ５２００ｍｍの袋型）を作成し、製品の初期圧損、払い落とし頻度、１年後の圧力損失を評価した。
【００１８】
集塵の対象ガスは温度２３０℃〜２４０℃、水分率５％〜３０％、ＨＣＬ濃度が３００ｍｇ／Ｎｍ３、ＳＯｘ濃度が１２０ｐｐｍ、ＮＯｘ濃度が１００ｐｐｍ、及び見掛け濾過速度が１．２ｍ／分であった。
【００１９】
（実施例１）
繊度２．２デシテックスで繊維長６０ｍｍの芳香族ポリイミド繊維（商品名：東洋紡Ｐ８４）のステープルファイバ５０ｗｔ％と、繊度０．７デシテックスで繊維長６０ｍｍの極細の芳香族ポリイミド繊維（Ｐ８４）５０ｗｔ％を均一混合して、次いで、カーディング機により繊維層Ａを得た。
更に、繊度２．２デシテックスで繊維長６０ｍｍの芳香族ポリイミド繊維（Ｐ８４）１００ｗｔ％をカーディング機により繊維層Ｂを得た。
また、繊度１０６０デシテックスの芳香族ポリイミド繊維（Ｐ８４）のマルチフィラメントを用いてタテ１２本／インチ、ヨコ１０本／インチの平織りを作成し基布とした。
そして、この基布の表面に繊維層Ａを、裏面に繊維層Ｂを夫々積層し、ニードルパンチ加工を施して不織布を得た。この不織布をカレンダープレスロール機により２４０℃で処理速度２．０ｍ／分でローラー間の隙間巾０．８ｍｍで不織布を処理し、引き続き、高温熱風ヒートセット機により、３００℃で実行処理時間４０秒で３％伸張処理を行って本発明のフィルター材を得た。
【００２０】
（実施例２）
実施例１と同様に不織布を得、カレンダー処理も同じ条件で処理し、高温熱風ヒートセット機により、３１５℃、実行処理時間４０秒で３％伸張処理を行った以外は実施例１と全て同じ処理で本発明のフィルター材を得た。
【００２１】
（実施例３）
実施例１で得られたフィルター材の極細繊維を含む繊維層Ａ側にポリテトラフロルエチレン樹脂を付与量６ｗｔ％になるように表面コーティングを施して同様の過程で本発明のフィルター材を得た。
【００２２】
（比較例１）
実施例１と同様に得られた繊維層Ａを基布の両面に積層してニードルパンチ加工を施して不織布を得た。次いでこの不織布をカレンダープレスロール機により２４０℃で処理速度２．０ｍ／分でローラー間の隙間巾０．８ｍｍで処理し、引き続きこの不織布を高温熱風ヒートセット機により３１５℃で実行処理時間４０秒で３％伸張処理を行って比較フィルター材を得た。
【００２３】
（比較例２）
実施例１と同様に得られた繊維層Ｂを基布の両面に積層してニードルパンチ加工を施して不織布を得た、そして、この不織布をカレンダープレスロール機により２４０℃で処理速度２．０ｍ／分でローラー間の隙間巾０．８ｍｍで不織布を処理し、引き続きこの不織布を高温熱風ヒートセット機により３１５℃で実行処理時間４０秒で３％伸張処理をおこなって比較フィルター材を得た。
【００２４】
（比較例３）
実施例１と同様に不織布を得て、カレンダー処理も同じ条件で処理し、高温熱風ヒートセット機により２８０℃実行処理時間４０秒で３％伸張処理を行った以外は実施例１と全て同じ処理で比較フィルター材を得た。
（比較例４）
市販品メンブレンを比較対象に同様な評価を行った。
【００２５】
以上のようにして得られた実施例１，２，３及び比較例１，２，３，４の各フィルター材について夫々、特性評価を行った。その結果を表１に示す。
【００２６】
【表１】
上記表より実施例１，２，３共に各比較例に比べ濾過性能は低圧損で、払い落とし頻度も少なく、高効率であることが判る。
【００２８】
【発明の効果】
本発明は以上のように、芳香族ポリイミド繊維からなる構成繊度１．０デシテックス以下の極細繊維を２０ｗｔ％以上含有してなる繊維層を基布の両面又は片面に積層し、絡合してなる該不織布を３００℃以上の温度で熱処理したフィルター材であり、上記極細繊維を含有する層を高温乾熱処理することにより表面と内層とで密度の勾配が出来、その表面を耐熱樹脂でコーティングすることにより、表面層の細孔の微小化及び平滑化を達成し、しかもダストの捕集力が高くなると共に、ダストが繊維層内部に侵入することを防ぐ結果、ダストの剥離性も向上する顕著な効果を有する。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a surface filtration filter material, and more particularly, to a high-efficiency low-pressure-drop heat-resistant filter material for collecting dust in high-temperature exhaust gas, particularly fine particles.
[0002]
[Prior art]
Conventionally, a number of materials have been proposed as filter materials for dust collection in order to remove fine particles contained in high-temperature combustion exhaust gas discharged from a furnace or a waste incinerator of a thermal power plant, for example, a meta-aromatic polyamide fiber, A woven or nonwoven fabric made of a single material such as polyphenylene sulfide (PPS) fiber, glass fiber, or Teflon (registered trademark), or a woven fabric as a base fabric, or a woven fabric, nonwoven fabric, or woven fabric made of a combination of the above materials What has been used.
[0003]
However, the nonwoven fabric type heat-resistant filter medium has, due to its configuration, a large inter-fiber gap of the fibers constituting the surface filtration surface, and is also easily fluffed, so that dust easily enters the inside of the filter medium at the time of filtration, and dust is removed. There was a difficulty in the effect (dust releasability).
Accordingly, there is a problem that the filter medium is easily clogged and the pressure loss increases with time.
[0004]
Therefore, in order to solve such a problem, the fluff on the surface of the non-woven fabric constituting the filter medium is subjected to a baking treatment, the surface is impregnated with a heat-resistant resin, the surface is coated with a heat-resistant resin, and dust is generated. It has been considered and proposed to prevent intrusion into the inside of the filter medium.
[0005]
For example, in Japanese Patent Application Laid-Open No. 61-160466, as disclosed in the publication, fine glass fibers of 0.2 to 0.4 denier (3.4 to 4.7 μm) are added to tetrafluoroethylene (PTFE) fibers. Needle non-woven fabrics mixed with are studied.
Further, a proposal for improving the releasability of the nonwoven fabric has been made in Japanese Patent Application Laid-Open No. 5-245316.
Further, a filter medium in which a thin film having fine pores (membrane) obtained by stretching a tetrafluoroethylene resin (PTFE) film on the surface of a nonwoven fabric made of synthetic fiber is provided, is provided. A proposal for improving the dispensing performance can also be found in JP-A-5-57116.
[0006]
[Problems to be solved by the invention]
However, dust generated during combustion in an incinerator, a boiler, or the like becomes finer as the combustion temperature increases, and as described in the conventional example, the fluff on the surface of the nonwoven fabric is subjected to fuzzing treatment or impregnated with heat-resistant resin. The method of coating alone has a low dust collecting efficiency, and has not been able to find a sufficient solution.
[0007]
The present invention has been made to solve the problems described above, and has an object to solve such a problem.Especially, by trying to use ultrafine fibers of aromatic polyimide fibers, extremely good dust collecting properties and An object of the present invention is to provide a long-life, high-efficiency, low-pressure-drop surface filtration filter material having excellent heat resistance, strength, and dust removal properties.
[0008]
[Means for Solving the Problems]
That is, the present invention that meets the above object is a nonwoven fabric made of an aromatic polyimide fiber, which comprises a fiber layer containing 20 wt% or more of ultrafine aromatic polyimide fibers having a constituent fineness of 1.0 decitex (dtex) or less. A high-efficiency low-pressure-drop surface filtration filter material is formed by laminating on at least one surface of a base fabric made of aromatic polyimide fiber fibers, entangled with each other, and heat-treated at a temperature of 300 ° C. or more.
[0009]
Claim 2 is a more specific structure, which is a non-woven fabric made of aromatic polyimide fiber, which contains 20 wt% or more of ultrafine aromatic polyimide fiber having a constituent fineness of 1.0 decitex or less, and has an ordinary thickness. A fiber layer mixed with a polyimide fiber and a fiber layer made of an aromatic polyimide fiber having a normal thickness are respectively laminated on both sides of a base fabric made of an aromatic polyimide fiber, subjected to a confounding treatment, and subjected to a high temperature of 300 ° C. or more. Characterized by being heat-treated.
Here, in each of the above structures, it is also effective to coat the surface or the entire surface of the ultrafine fiber-containing fiber layer of the nonwoven fabric made of the aromatic polyimide fiber with a heat resistant binder.
[0010]
By performing the high-temperature heat treatment, the ultrafine fibers on the surface of the fiber layer containing the ultrafine fibers are appropriately tensioned, the surface is dense, and the inner surface has a density gradient in the thickness direction, so that the filtration performance is excellent.
In particular, it has high efficiency and low pressure loss for collecting fine particles and good dust releasability. Further, when the surface on the side of the ultrafine fiber layer is coated with a heat-resistant binder, the filtration performance can be further improved.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, specific embodiments of the present invention will be described in detail.
As described above, the present invention is based on the use of an aromatic polyimide fiber having excellent heat resistance for forming a fiber layer and a base fabric.
That is, the base fabric used in the present invention is a woven or knitted fabric made of aromatic polyimide fibers, and the fiber layer is also a fiber layer made of aromatic polyimide fibers.
In particular, the entire fiber layer is an aromatic polyimide fiber, but the fiber layer is not limited to 100% by weight of ultrafine fibers, and may be a fiber layer composed of a mixture of aromatic polyimide fibers of normal thickness and ultrafine fibers.
In this case, the component amount of the ultrafine fibers in the mixed fiber layer is preferably 20 wt% or more, particularly preferably in the range of 20 wt% to 80 wt%, and if it is 20 wt% or less, the filtration characteristics as the effect of the ultrafine fibers cannot be sufficiently exhibited.
Here, as a fiber having a normal thickness of the aromatic polyimide fiber, a fiber exceeding 1 decitex and having 2 to 5 decitex is usually used.
[0012]
When laminating the above-described base fabric and the fibers, it is necessary to laminate a fiber layer containing ultrafine fibers on at least one surface of the base fabric.
When laminating on both sides of the base fabric, both sides may be a fiber layer containing ultrafine fibers, but a fiber layer containing ultrafine fibers is laminated on one surface of the base fabric, and the other surface has a thickness of about 2 mm. You may make it laminate | stack the fiber layer which consists of an aromatic polyimide fiber of -5 decitex.
When an aromatic polyimide fiber is used for the fiber layer, the productivity in the manufacturing process is good because the aromatic polyimide fiber has an irregular irregular cross-sectional shape and an appropriate surface friction characteristic.
[0013]
Next, when the base fabric and the fiber layer are laminated as described above, both are subjected to needle punching and entangled and integrated.
By sufficiently performing the entanglement treatment, a nonwoven fabric in which fibers are strongly entangled with each other can be obtained.
Therefore, a filter material product that is stable at a high temperature can be obtained by performing a calendering treatment to adjust the thickness, the surface of the fiber layer and the fibers of the inner layer, and then performing a drying heat treatment at a high temperature of 300 ° C. or higher.
[0014]
The above product obtained by high-temperature dry heat treatment is treated with high heat of 300 ° C or more, so that the fiber layer surface has a dense and uniform structure and the inner surface shows a structure slightly rougher than the surface, especially fibers containing ultrafine fibers. The layer shrinks during the high temperature treatment to provide a stable product with moderate compaction. Therefore, this structure collects fine particle dust and constitutes a product having a filtering performance with excellent dust removing property.
Further, by coating the heat-resistant binder on the ultrafine fiber layer side of the nonwoven fabric in the obtained product, the filtration performance can be further improved.
[0015]
【Example】
Next, examples and comparative examples of the present invention will be described, but the present invention is not limited to these examples.
In the following Examples and Comparative Examples, measurement of the basis weight, thickness, air permeability, and evaluation of filtration performance were performed according to the following methods.
[0016]
The basis weight was determined according to the method described in JIS L1096, 8.4.2.
The thickness was measured at a load of 2 KPa according to the method described in 8.5.1 of JIS L1096.
The air permeability was measured with a flanger type tester described in 6.27.1 of JIS L1096.
[0017]
Evaluation of filter cloth A filter cloth (bag type having a diameter of 164 mm x a length of 5200 mm) for a bag filter filtration dust collector (“Bottom Inlet” manufactured by NKK) used in an incinerator for municipal garbage was prepared, and the initial pressure loss of the product was measured. The frequency of withdrawal and the pressure loss one year later were evaluated.
[0018]
The target gas for dust collection has a temperature of 230 ° C. to 240 ° C., a moisture content of 5% to 30%, an HCL concentration of 300 mg / Nm 3 , an SOx concentration of 120 ppm, a NOx concentration of 100 ppm, and an apparent filtration rate of 1.2 m / min. there were.
[0019]
(Example 1)
50 wt% of staple fiber of aromatic polyimide fiber (trade name: Toyobo P84) with a fiber size of 2.2 decitex and a fiber length of 60 mm, and 50 wt% of ultra-fine aromatic polyimide fiber (P84) with a fiber size of 0.7 decitex and a fiber length of 60 mm After uniform mixing, a fiber layer A was obtained with a carding machine.
Further, 100% by weight of an aromatic polyimide fiber (P84) having a fiber size of 2.2 decitex and a fiber length of 60 mm was used to obtain a fiber layer B by a carding machine.
Further, using a multifilament of an aromatic polyimide fiber (P84) having a fineness of 1060 dtex, a plain weave of 12 warps / inch and 10 wefts / inch was prepared as a base cloth.
Then, a fiber layer A was laminated on the front surface of the base fabric, and a fiber layer B was laminated on the back surface, and subjected to needle punching to obtain a nonwoven fabric. This non-woven fabric is treated with a calender press roll machine at 240 ° C. at a processing speed of 2.0 m / min and a gap width between rollers of 0.8 mm, and subsequently, at 300 ° C. by a high-temperature hot air heat setting machine, an execution processing time of 40 seconds. For 3% to obtain a filter material of the present invention.
[0020]
(Example 2)
Same as Example 1 except that a nonwoven fabric was obtained in the same manner as in Example 1, calendering was performed under the same conditions, and a 3% elongation process was performed with a high-temperature hot air heat setting machine at 315 ° C. and an execution time of 40 seconds. The filter material of the present invention was obtained by the treatment.
[0021]
(Example 3)
A surface coating was applied to the fiber layer A containing the ultrafine fibers of the filter material obtained in Example 1 so that the applied amount of polytetrafluoroethylene resin was 6 wt%, and a filter material of the present invention was obtained in the same process. .
[0022]
(Comparative Example 1)
The fiber layer A obtained in the same manner as in Example 1 was laminated on both sides of the base fabric and subjected to needle punching to obtain a nonwoven fabric. Next, this nonwoven fabric was processed at 240 ° C. by a calender press roll machine at a processing speed of 2.0 m / min with a gap width between rollers of 0.8 mm, and then this nonwoven fabric was processed at 315 ° C. by a high-temperature hot air heat setting machine at a processing time of 40 seconds. To perform a 3% elongation treatment to obtain a comparative filter material.
[0023]
(Comparative Example 2)
The fiber layer B obtained in the same manner as in Example 1 was laminated on both surfaces of the base fabric and subjected to needle punching to obtain a nonwoven fabric. The nonwoven fabric was treated at 240 ° C. with a calender press roll machine at a processing speed of 2.0 m. The nonwoven fabric was treated with a gap width between the rollers of 0.8 mm / min and then subjected to a 3% elongation treatment at 315 ° C. with a high-temperature hot air heat setting machine at 315 ° C. for 40 seconds to obtain a comparative filter material.
[0024]
(Comparative Example 3)
A nonwoven fabric was obtained in the same manner as in Example 1, the calendering treatment was performed under the same conditions, and a 3% elongation treatment was performed using a high-temperature hot-air heat setting machine at 280 ° C. and a processing time of 40 seconds. Thus, a comparative filter material was obtained.
(Comparative Example 4)
The same evaluation was performed using a commercially available membrane as a comparative object.
[0025]
The characteristics of each of the filter materials of Examples 1, 2, 3 and Comparative Examples 1, 2, 3, and 4 obtained as described above were evaluated. Table 1 shows the results.
[0026]
[Table 1]
From the above table, it can be seen that the filtering performance of Examples 1, 2, and 3 is lower than that of Comparative Examples, the pressure loss is lower, the frequency of removing is less, and the efficiency is higher.
[0028]
【The invention's effect】
As described above, the present invention is obtained by laminating and entangled a fiber layer containing at least 20 wt% of ultrafine fibers having a constituent fineness of 1.0 decitex or less composed of aromatic polyimide fibers on both surfaces or one surface of a base fabric. A filter material obtained by heat-treating the non-woven fabric at a temperature of 300 ° C. or more. A density gradient can be formed between the surface and the inner layer by subjecting the layer containing the ultrafine fibers to high-temperature dry heat treatment, and coating the surface with a heat-resistant resin. Thereby, the fineness and smoothness of the pores of the surface layer are achieved, and the dust collecting power is increased, and the dust is prevented from entering the fiber layer. Has an effect.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002330620A JP4137602B2 (en) | 2002-11-14 | 2002-11-14 | Surface filter material with high efficiency and low pressure loss |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002330620A JP4137602B2 (en) | 2002-11-14 | 2002-11-14 | Surface filter material with high efficiency and low pressure loss |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2004160394A true JP2004160394A (en) | 2004-06-10 |
| JP4137602B2 JP4137602B2 (en) | 2008-08-20 |
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| JP2002330620A Expired - Fee Related JP4137602B2 (en) | 2002-11-14 | 2002-11-14 | Surface filter material with high efficiency and low pressure loss |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009000608A (en) * | 2007-06-20 | 2009-01-08 | Toyota Boshoku Corp | Filter medium for filter, filter for filtration of fluid and oil filter for engine |
| JP2009119327A (en) * | 2007-11-13 | 2009-06-04 | Kureha Ltd | Lightweight heat-resistant filter |
| JP2021102197A (en) * | 2019-12-25 | 2021-07-15 | 日本バイリーン株式会社 | Heat resistant filter |
| CN114126742A (en) * | 2019-07-16 | 2022-03-01 | 可乐丽可乐富丽世股份有限公司 | Fiber structure and method for producing same |
| KR20220110907A (en) * | 2021-02-01 | 2022-08-09 | 주식회사 전산텍스 | High-temperature hybrid bag filter structure using Polyimide and manufacturing method the same |
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|---|---|---|---|---|
| JPH06244606A (en) * | 1993-02-18 | 1994-09-02 | Fuji Elelctrochem Co Ltd | Laminated dielectric filter and manufacture of the same |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009000608A (en) * | 2007-06-20 | 2009-01-08 | Toyota Boshoku Corp | Filter medium for filter, filter for filtration of fluid and oil filter for engine |
| JP2009119327A (en) * | 2007-11-13 | 2009-06-04 | Kureha Ltd | Lightweight heat-resistant filter |
| CN114126742A (en) * | 2019-07-16 | 2022-03-01 | 可乐丽可乐富丽世股份有限公司 | Fiber structure and method for producing same |
| CN114126742B (en) * | 2019-07-16 | 2024-05-03 | 可乐丽可乐富丽世股份有限公司 | Fiber structure and method for producing same |
| JP2021102197A (en) * | 2019-12-25 | 2021-07-15 | 日本バイリーン株式会社 | Heat resistant filter |
| JP7477137B2 (en) | 2019-12-25 | 2024-05-01 | 日本バイリーン株式会社 | Heat Resistant Filter |
| KR20220110907A (en) * | 2021-02-01 | 2022-08-09 | 주식회사 전산텍스 | High-temperature hybrid bag filter structure using Polyimide and manufacturing method the same |
| KR102433185B1 (en) | 2021-02-01 | 2022-08-22 | 주식회사 전산텍스 | High-temperature hybrid bag filter structure using Polyimide and manufacturing method the same |
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| JP4137602B2 (en) | 2008-08-20 |
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