JP2001149719A - Heat resistant filter material - Google Patents
Heat resistant filter materialInfo
- Publication number
- JP2001149719A JP2001149719A JP34028299A JP34028299A JP2001149719A JP 2001149719 A JP2001149719 A JP 2001149719A JP 34028299 A JP34028299 A JP 34028299A JP 34028299 A JP34028299 A JP 34028299A JP 2001149719 A JP2001149719 A JP 2001149719A
- Authority
- JP
- Japan
- Prior art keywords
- fiber
- heat
- filter material
- resistant
- flame
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
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- Filtering Materials (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、高温ガス中のダス
トを捕集するための耐熱性フィルタ材に関し、特に発火
が生じる使用条件に好適な耐熱性フィルタ材に関するも
のである。The present invention relates to a heat-resistant filter material for collecting dust in a high-temperature gas, and more particularly to a heat-resistant filter material suitable for use conditions in which ignition occurs.
【０００２】[0002]
【従来の技術】高温ガスを処理対象としたバグフィルタ
装置には、種々の材質のフィルタ材が使用されている。
このようなフィルタ材では、ガスの高温に耐え得る所要
の耐熱性を満足することはもちろんであるが、この他
に、粉塵払い落とし時の負荷に耐え得る強度、ガスに含
まれる各種化学物質に対する化学的安定性が求められて
いる。他方、直接火炎に曝されることがないため、従
来、難燃性・耐炎性については一般に重要視されていな
かった。2. Description of the Related Art Various types of filter materials are used in bag filter devices for processing high-temperature gas.
Such a filter material not only satisfies the required heat resistance that can withstand the high temperature of the gas, but also has a strength that can withstand the load at the time of dusting off, and various chemical substances contained in the gas. Chemical stability is required. On the other hand, flame resistance and flame resistance have not been generally regarded as important since they are not directly exposed to flame.
【０００３】[0003]
【発明が解決しようとする課題】ところが、例えば製鋼
炉から回収されるガスを除塵するバグフィルタ装置にお
いては、ガス中の粉塵に起因する静電気によると考えら
れる発火が生じることがあり、これによりフィルタ材に
燃焼・溶融による焼損が一部でも生じれば、フィルタ材
としての機能が損なわれ、継続使用が困難となるため、
このような使用環境で用いられるバグフィルタ用フィル
タ材には高い耐炎性が望まれる。However, for example, in a bag filter device for removing gas collected from a steelmaking furnace, ignition may be caused by static electricity caused by dust in the gas, and this may cause a problem. If any burnout due to combustion or melting occurs in the material, the function as a filter material will be impaired, making continuous use difficult.
High flame resistance is desired for a filter material for a bag filter used in such a use environment.
【０００４】本発明は、このような従来技術の問題点を
解消するべく案出されたものであり、その主な目的は、
発火を起こす使用条件でも目立った損傷を生じることな
く継続使用が可能な耐炎性を有する耐熱性フィルタ材を
提供することにある。[0004] The present invention has been devised to solve such problems of the prior art, and its main objects are as follows.
It is an object of the present invention to provide a flame-resistant heat-resistant filter material that can be used continuously without causing noticeable damage even under use conditions causing ignition.
【０００５】[0005]
【課題を解決するための手段】このような目的を果たす
ために、本発明においては、耐熱性フィルタ材の構成
を、織布からなる基布に不織繊維集合体を積層一体化し
てなり、該不織繊維集合体が、ポリアクリロニトリル
（ＰＡＮ）系の前駆体繊維（プリカーサ）を酸化性雰囲
気中で加熱処理して得られる、炭化率が４５％〜６０％
のアクリル系耐炎化繊維を主材料としたものとした。In order to achieve the above object, in the present invention, a heat-resistant filter material is formed by laminating and integrating a non-woven fiber aggregate on a woven base cloth. The nonwoven fiber aggregate is obtained by heat-treating a polyacrylonitrile (PAN) -based precursor fiber (precursor) in an oxidizing atmosphere, and has a carbonization rate of 45% to 60%.
Acrylic oxidized fiber as the main material.
【０００６】これによると、発火を起こしてもフィルタ
材自体の燃焼・溶融による損傷が軽微で済むため、消火
すれば継続使用が可能である。しかも、耐炎化繊維が適
度な強度及び伸度を備えているため、製造工程における
不織繊維集合体の形成が容易である。耐炎化繊維の炭化
率は、使用環境等に応じて適宜な性能のものを選択すれ
ば良いが、炭化率が低いと耐炎性が低下して発火に対す
る所要の耐炎性が得られず、例えば炭化率が４０％程度
では発火による損傷が顕著で継続使用が困難となる。こ
れとは逆に炭化率が高いと耐炎性が向上する反面、柔軟
性が低下して不織繊維集合体のニードリング工程で繊維
が切損し易くなり、不織繊維集合体の形成が困難にな
る。このことから、耐炎化繊維の炭化率は４５％〜６０
％の範囲内、より望ましくは５１％程度とすると良く、
このような炭化率の耐炎化繊維では発火時の継続使用が
可能な耐炎性とニードリング工程での不織繊維集合体の
形成が容易な柔軟性とを両立させることができる。な
お、前記の耐炎化繊維では、耐炎性の指標としての限界
酸素指数（ＬＯＩ）が概ね５０以上を示し、破断伸度が
１０％〜２０％となる。[0006] According to this, even if ignition occurs, damage due to combustion and melting of the filter material itself is minimal, and if the fire is extinguished, it can be used continuously. Moreover, since the oxidized fiber has appropriate strength and elongation, it is easy to form a nonwoven fiber aggregate in the manufacturing process. The carbonization rate of the flame-resistant fiber may be appropriately selected depending on the use environment and the like.However, if the carbonization rate is low, the flame resistance is reduced and the required flame resistance to ignition cannot be obtained. When the rate is about 40%, damage due to ignition is remarkable, and continuous use becomes difficult. Contrary to this, when the carbonization rate is high, flame resistance is improved, but on the other hand, the flexibility is reduced and the fibers are easily cut off in the needling process of the nonwoven fiber aggregate, making it difficult to form the nonwoven fiber aggregate. Become. From this, the carbonization rate of the oxidized fiber is 45% to 60%.
%, More preferably about 51%,
The flame-resistant fiber having such a carbonization ratio can achieve both the flame resistance that can be used continuously at the time of ignition and the flexibility that allows easy formation of a nonwoven fiber aggregate in the needling process. In addition, in the above-mentioned flame-resistant fiber, the limiting oxygen index (LOI) as an index of the flame resistance generally shows 50 or more, and the breaking elongation becomes 10% to 20%.
【０００７】特に、前記不織繊維集合体が、耐炎化繊維
に、熱セット性を高める耐熱性合成繊維を混綿したもの
であると良い。これによると、製造工程において、ニー
ドリングの後工程で加熱ロール間に通して圧縮する際の
成形の容易さ、いわゆる熱セット性が耐熱性合成繊維に
より向上するため、プレス後の密度を高く維持して通気
度を低く抑えることができ、これにより微小ダストの捕
集率を高めることができる。前記のアクリル系耐炎化繊
維は剛性が十分でないため、単独では高い密度状態に維
持しておくことが難しく、高い剛性を有する耐熱性合成
繊維を混綿することにより不織繊維集合体層が所要の密
度に保持される。In particular, it is preferable that the non-woven fiber aggregate is made of a mixture of flame-resistant fiber and heat-resistant synthetic fiber for improving heat setting property. According to this, in the manufacturing process, the ease of molding when passing between heating rolls in the subsequent process of needling, the so-called heat setting property is improved by the heat-resistant synthetic fiber, so that the density after pressing is kept high. As a result, the air permeability can be kept low, and the collection rate of fine dust can be increased. Since the acrylic flame-resistant fiber has insufficient rigidity, it is difficult to maintain a high-density state by itself, and the nonwoven fiber aggregate layer is required by mixing heat-resistant synthetic fibers having high rigidity. Maintained in density.
【０００８】さらに、前記耐熱性合成繊維が、芳香族ポ
リアミド繊維であると好ましく、これによると、所要の
熱セット性を得ることが容易である上に、比較的高い耐
熱性を有することから、フィルタ材の耐熱性を損なう不
都合を回避し、常用耐熱温度１５０℃〜２００℃といっ
た比較的高い耐熱性を有するフィルタ材を得ることがで
き、しかも比較的安価であるため、フィルタ材の製造コ
ストの上昇を抑えることができる。なお、常用温度がよ
り高い１７０℃〜２３０℃の領域用には、芳香族ポリア
ミド繊維の代わりに芳香族ポリイミド繊維を用いること
が可能であり、また高温ガス中に腐食性成分が高濃度に
含まれる場合には耐蝕性に優れるポリフェニレンサルフ
ァイド繊維あるいはポリテトラフルオロエチレン繊維を
用いることも可能である。Further, it is preferable that the heat-resistant synthetic fiber is an aromatic polyamide fiber. According to this, it is easy to obtain a required heat-setting property, and it has relatively high heat resistance. By avoiding the disadvantage of impairing the heat resistance of the filter material, it is possible to obtain a filter material having a relatively high heat resistance such as a normal heat resistance temperature of 150 ° C. to 200 ° C. Further, since the filter material is relatively inexpensive, the manufacturing cost of the filter material is reduced. The rise can be suppressed. In addition, for the region where the normal temperature is higher, that is, 170 ° C. to 230 ° C., it is possible to use aromatic polyimide fibers instead of aromatic polyamide fibers, and a high concentration of corrosive components in the high-temperature gas. In this case, it is also possible to use polyphenylene sulfide fiber or polytetrafluoroethylene fiber which is excellent in corrosion resistance.
【０００９】これに加えて、前記基布が、ガラス繊維か
らなり、フッ素系樹脂、望ましくはポリテトラフルオロ
エチレン樹脂を主成分とするものによるコーティングが
施されたものとすると好ましい。これによると、ガラス
繊維の織布が引張強度が高くかつ伸び難い特性を有する
ことから、強度が高く寸法安定性に優れたフィルタ材を
得ることができる。しかも、ガラス繊維は比較的安価で
あることから、製造コストを低減することができる。さ
らに、ガラス繊維にコーティングされたフッ素系樹脂の
低摩擦特性により、ニードリング時にガラス繊維が損傷
を受けるのを抑制することができ、ニードリングによる
基布と不織繊維集合体との一体化を簡便に行うことが可
能となる。さらに、ガラス繊維が損傷を受けることで生
じる微細繊維が空気中に飛散したり、製品に接触した際
に手や衣服に付着したりすることがなくなり、衛生環境
上の問題も解消される。しかも、このコーティングによ
りガラス繊維の弱点である耐アルカリ性を改善すること
ができる。In addition, it is preferable that the base cloth is made of glass fiber and is coated with a fluororesin, preferably a polytetrafluoroethylene resin as a main component. According to this, since the woven fabric of glass fiber has high tensile strength and is hardly stretched, a filter material having high strength and excellent dimensional stability can be obtained. In addition, since glass fibers are relatively inexpensive, manufacturing costs can be reduced. Furthermore, due to the low friction characteristics of the fluororesin coated on the glass fiber, it is possible to prevent the glass fiber from being damaged at the time of needling, and to integrate the base fabric and the nonwoven fiber aggregate by needling. This can be easily performed. Furthermore, the fine fibers generated by the damage of the glass fibers are not scattered in the air or adhere to hands or clothes when they come into contact with the product, and the problem of the sanitary environment is also solved. Moreover, this coating can improve the alkali resistance, which is a weak point of glass fibers.
【００１０】[0010]
【発明の実施の形態】以下に添付の図面を参照して本発
明の構成を詳細に説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described below in detail with reference to the accompanying drawings.
【００１１】図１は、本発明に基づき構成された耐熱性
フィルタ材を示している。この耐熱性フィルタ材は、織
布からなる基布１と、この基布１の表裏両面に積層され
た一対の不織繊維集合体２・３とをニードリングにより
絡合一体化してなっている。なお、基布１の片面にのみ
不織繊維集合体を積層する態様も可能であり、この場
合、不織繊維集合体はダスト膜が形成されるガス流れの
上流側の面に積層される。FIG. 1 shows a heat resistant filter material constructed according to the present invention. In this heat resistant filter material, a base cloth 1 made of a woven cloth and a pair of nonwoven fiber aggregates 2 and 3 laminated on both front and back surfaces of the base cloth 1 are entangled and integrated by needling. . In addition, a mode in which the nonwoven fiber aggregate is laminated only on one surface of the base fabric 1 is also possible. In this case, the nonwoven fiber aggregate is laminated on the surface on the upstream side of the gas flow in which the dust film is formed.
【００１２】基布１は、ガラス繊維のマルチフィラメン
ト糸を平織して得られるものであり、ガラス繊維に連続
糸を使用することで高い強度と寸法安定性が得られる。
この基布１には、ポリテトラフルオロエチレン樹脂から
なる被膜材料によるコーティングが施される。なお、被
膜材料にシリコン樹脂からなるものを用いることも可能
である。The base fabric 1 is obtained by plain weaving a glass fiber multifilament yarn, and high strength and dimensional stability can be obtained by using a continuous yarn for the glass fiber.
The base fabric 1 is coated with a coating material made of polytetrafluoroethylene resin. It is also possible to use a film material made of silicon resin.
【００１３】基布１へのコーティングは、ガラス繊維か
ら織布に織り上げた後に行われ、ポリテトラフルオロエ
チレン樹脂を水中に粒状に分散させた被膜材料液に織布
を浸漬した後、乾燥・硬化させることで、ガラス繊維表
面にポリテトラフルオロエチレン樹脂の被膜が形成され
る。The coating on the base fabric 1 is performed after weaving the glass fabric into a woven fabric. The woven fabric is immersed in a coating material liquid in which polytetrafluoroethylene resin is dispersed in water in a granular form, and then dried and cured. By doing so, a coating film of polytetrafluoroethylene resin is formed on the glass fiber surface.
【００１４】不織繊維集合体２・３は、アクリル系の耐
炎化繊維と芳香族ポリアミドからなる耐熱性合成繊維と
を混綿機で所定の配合割合で混合した上でカードに通し
て得られる。両繊維にはクリンプ付きのステープルファ
イバを使用する。The nonwoven fiber aggregates 2 and 3 are obtained by mixing an acrylic flame-resistant fiber and a heat-resistant synthetic fiber made of an aromatic polyamide at a predetermined mixing ratio with a cotton blender and passing the mixture through a card. Staple fibers with crimps are used for both fibers.
【００１５】耐炎化繊維は、ポリアクリロニトリル（Ｐ
ＡＮ）系繊維を前駆体繊維（プリカーサ）とし、これを
炭化率が４５％〜６０％、より望ましくは５１％程度に
なるように２００℃〜３００℃の酸化性雰囲気中（空気
中）で加熱処理して得られるものであり、所要の捲縮処
理を施した上で所定長さに切断してステープルファイバ
を得る。このような耐炎化繊維素材としては、例えば、
旭化成工業社製ラスタン（商品名）が好適である。The oxidized fiber is made of polyacrylonitrile (P
AN) -based fiber is used as a precursor fiber (precursor), which is heated in an oxidizing atmosphere (in air) at 200 ° C. to 300 ° C. so that the carbonization rate becomes 45% to 60%, more preferably about 51%. The staple fiber is obtained by performing a required crimping treatment and then cutting it to a predetermined length. As such a flame-resistant fiber material, for example,
Rastern (trade name) manufactured by Asahi Kasei Corporation is preferred.
【００１６】不織繊維集合体２・３は、ニードリングに
より基布１と一体化された後、表面温度を２３０℃〜３
００℃、好ましくは２５０℃〜２７０℃とした加熱ロー
ル間に通して圧縮され、この熱セットにより所要の密度
に高められ、さらにフィルタ材表面の毛羽を無くすため
に毛焼き加工が行われる。After the nonwoven fiber aggregates 2 and 3 are integrated with the base fabric 1 by needling, the surface temperature is set to 230 ° C. to 3 ° C.
Compressed by passing between heating rolls at a temperature of 00 ° C., preferably 250 ° C. to 270 ° C., the density is increased to a required density by this heat setting, and a fuzzing process is performed to eliminate fluff on the surface of the filter material.
【００１７】耐炎化繊維と耐熱性合成繊維との配合割合
は、処理すべきガスの性状等に応じて適宜選択される
が、重量比で、耐炎化繊維を７０％以上、耐熱性合成繊
維を３０％以下、望ましくは耐炎化繊維を９０％以上、
耐熱性合成繊維を１０％以下とすると良い。この程度に
耐熱性合成繊維の配合比率を抑えると、耐炎性をさほど
低下させることなく熱セット性を格段に向上させ、ダス
ト捕集能力に優れたフィルタ材を得ることができる。The mixing ratio of the oxidized fiber and the heat-resistant synthetic fiber is appropriately selected according to the properties of the gas to be treated. 30% or less, desirably 90% or more of the oxidized fiber,
The content of the heat-resistant synthetic fiber is preferably 10% or less. If the compounding ratio of the heat-resistant synthetic fiber is suppressed to this extent, the heat setting property is remarkably improved without significantly reducing the flame resistance, and a filter material having excellent dust collecting ability can be obtained.
【００１８】[0018]
【発明の効果】このように本発明によれば、４５％〜６
０％の炭化率を有するアクリル系耐炎化繊維を主材料と
したため、発火を起こしてもフィルタ材自体の燃焼・溶
融による損傷が軽微で済むことから継続使用が可能とな
る。このため、金属溶解炉設備等のバグフィルタ装置に
おける発火事故の際にも、フィルタ材の取り替えが不要
となり、そのために要するコストを削減する他、運転休
止等の操業面での障害発生を未然に防止することがで
き、極めて顕著な効果が得られる。As described above, according to the present invention, 45% to 6%
Since the main material is an acrylic oxidized fiber having a carbonization rate of 0%, even if an ignition occurs, damage due to combustion and melting of the filter material itself is minimal, so that the filter material can be continuously used. For this reason, even in the event of a fire accident in a bag filter device such as a metal melting furnace, it is not necessary to replace the filter material, thereby reducing the cost required for the operation and preventing the occurrence of troubles in operation such as suspension of operation. Can be prevented, and a remarkable effect can be obtained.
【図１】本発明に基づき構成された耐熱性フィルタ材を
示す断面図。FIG. 1 is a cross-sectional view showing a heat-resistant filter material configured according to the present invention.
１ 基布 ２・３ 不織繊維集合体 1 Base fabric 2.3 Non-woven fiber aggregate
Claims (4)
積層一体化してなり、該不織繊維集合体が、ポリアクリ
ロニトリル系の前駆体繊維を酸化性雰囲気中で加熱処理
して得られる、炭化率が４５％〜６０％の耐炎化繊維を
主材料としたことを特徴とする耐熱性フィルタ材。1. A nonwoven fiber aggregate obtained by laminating and integrating a nonwoven fiber aggregate on a woven base fabric, wherein the nonwoven fiber aggregate is obtained by heating a polyacrylonitrile-based precursor fiber in an oxidizing atmosphere. A heat-resistant filter material characterized in that the main material is an oxidized fiber having a carbonization ratio of 45% to 60%.
維に、熱セット性を高める耐熱性合成繊維を混綿したも
のであることを特徴とする請求項１に記載の耐熱性フィ
ルタ材。2. The heat-resistant filter material according to claim 1, wherein the non-woven fiber aggregate is obtained by mixing the heat-resistant synthetic fiber with the heat-resistant synthetic fiber.
ミド繊維であることを特徴とする請求項２に記載の耐熱
性フィルタ材。3. The heat-resistant filter material according to claim 2, wherein the heat-resistant synthetic fiber is an aromatic polyamide fiber.
ッ素系樹脂によるコーティングが施されたものであるこ
とを特徴とする請求項１乃至請求項３のいずれかに記載
の耐熱性フィルタ材。4. The heat-resistant filter material according to claim 1, wherein the base fabric is made of glass fiber and is coated with a fluororesin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34028299A JP2001149719A (en) | 1999-11-30 | 1999-11-30 | Heat resistant filter material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34028299A JP2001149719A (en) | 1999-11-30 | 1999-11-30 | Heat resistant filter material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001149719A true JP2001149719A (en) | 2001-06-05 |
Family
ID=18335457
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP34028299A Pending JP2001149719A (en) | 1999-11-30 | 1999-11-30 | Heat resistant filter material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001149719A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010503776A (en) * | 2006-09-13 | 2010-02-04 | イー・アイ・デュポン・ドウ・ヌムール・アンド・カンパニー | Bag filter containing meta-aramid fiber and acrylic fiber |
| CN105498363A (en) * | 2015-12-22 | 2016-04-20 | 苏州协泰科技有限公司 | Production technology for modified PPS fiber filtering material |
| CN105544183A (en) * | 2015-12-22 | 2016-05-04 | 苏州协泰科技有限公司 | A PPS fiber modification process |
| JP2017164680A (en) * | 2016-03-16 | 2017-09-21 | タイガースポリマー株式会社 | Nonwoven fabric filter medium |
| CN109985449A (en) * | 2019-04-29 | 2019-07-09 | 江苏喜洋洋环保设备科技有限公司 | The preparation process of this woven coated filter material of glass fluorine |
| CN115445327A (en) * | 2022-08-25 | 2022-12-09 | 广德辉龙环保科技有限公司 | Alkali-resistant aramid composite filter bag and manufacturing process thereof |
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| JPH05177107A (en) * | 1991-12-27 | 1993-07-20 | Unitika Ltd | Continuous perforated sheet and its production |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010503776A (en) * | 2006-09-13 | 2010-02-04 | イー・アイ・デュポン・ドウ・ヌムール・アンド・カンパニー | Bag filter containing meta-aramid fiber and acrylic fiber |
| KR101456309B1 (en) * | 2006-09-13 | 2014-11-03 | 이 아이 듀폰 디 네모아 앤드 캄파니 | Bag filter comprising meta-aramid and acrylic fiber |
| CN105498363A (en) * | 2015-12-22 | 2016-04-20 | 苏州协泰科技有限公司 | Production technology for modified PPS fiber filtering material |
| CN105544183A (en) * | 2015-12-22 | 2016-05-04 | 苏州协泰科技有限公司 | A PPS fiber modification process |
| JP2017164680A (en) * | 2016-03-16 | 2017-09-21 | タイガースポリマー株式会社 | Nonwoven fabric filter medium |
| CN109985449A (en) * | 2019-04-29 | 2019-07-09 | 江苏喜洋洋环保设备科技有限公司 | The preparation process of this woven coated filter material of glass fluorine |
| CN115445327A (en) * | 2022-08-25 | 2022-12-09 | 广德辉龙环保科技有限公司 | Alkali-resistant aramid composite filter bag and manufacturing process thereof |
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