JP2019141794A

JP2019141794A - Bag filter

Info

Publication number: JP2019141794A
Application number: JP2018028922A
Authority: JP
Inventors: 昌弘古尾谷; Masahiro Furuoya
Original assignee: SAGAMI SHOKAI KK
Current assignee: SAGAMI SHOKAI KK
Priority date: 2018-02-21
Filing date: 2018-02-21
Publication date: 2019-08-29
Anticipated expiration: 2038-02-21
Also published as: JP7048081B2

Abstract

To provide a bag filter being made of a pleat-shaped cloth and capable of keeping a pleat shape in a backwash operation without increasing costs.SOLUTION: In a bag filter, a cylindrical opening base cloth 12 is sewn at the upper edge of a filter cloth body 10 made of a pleat spun-bonded nonwoven fabric and a cylindrical bottom cloth 14 with a bottom is sewn at a lower edge, an annular band 20 made of an SUS material is surrounded with a coating cloth 22 and sewn at the inside of the filter cloth body 10, a reinforcing implement 16 made by sewing the coating cloth 22 on a vertical cloth 24 is placed and the reinforcing implement 16 is sewn on an integral part 14' of the opening base cloth and the bottom cloth 14, and the cylindrical shape and the pleat shape of the filter cloth body 10 can be protected by the annular band 20 in a backwash operation and a conventional separated retainer can be omitted.SELECTED DRAWING: Figure 9

Description

この発明は、プリーツ形状の布帛よりなるバグフィルタに関し、焼却炉の集塵装置等に好適に使用することができるものである。 The present invention relates to a bag filter made of a pleated fabric and can be suitably used for a dust collector of an incinerator or the like.

焼却炉の集塵装置等における使用を意図したバグフィルタとしては、ろ過効率の観点から被処理ガスとの接触面積の増大を図る必要がありプリーツ形状はその形態としては望ましい。他方、耐久性が必要とされることから、従来は固体状の成形フィルタが主流であったが、コストの観点から濾布の素材として不織布を採用するようになってきている。この技術的トレンドの中で、本出願人等は、筒状をなし、プリーツ状の布帛よりなる濾布本体と、筒状をなし、濾布本体の長手方向一端に縫着された口元布と、有底筒状をなし濾布本体の長手方向他端に縫着された底布とを具備したバグフィルタを提案している（特許文献１）。濾布本体用の布帛としては、不織布にニードルパンチングされたものを採用している。事前処理として熱硬化性の樹脂を含浸した不織布がプリーツ成形機を通されることによりプリーツ形状が加熱下固定され、プリーツ形状の確保を図っている。 As a bag filter intended for use in a dust collector of an incinerator or the like, it is necessary to increase the contact area with the gas to be treated from the viewpoint of filtration efficiency, and the pleated shape is desirable as its form. On the other hand, since a durability is required, a solid molded filter has been mainly used in the past, but a nonwoven fabric has been adopted as a filter cloth material from the viewpoint of cost. In this technical trend, the present applicants have formed a tubular filter cloth body made of a pleated cloth, and a mouth cloth that has a tube shape and is sewn to one end in the longitudinal direction of the filter cloth body. A bag filter having a bottomed cylindrical shape and a bottom cloth sewn to the other longitudinal end of the filter cloth body has been proposed (Patent Document 1). As the cloth for the filter cloth main body, a cloth punched into a non-woven cloth is used. As a pretreatment, a nonwoven fabric impregnated with a thermosetting resin is passed through a pleat molding machine so that the pleated shape is fixed under heating, thereby ensuring the pleated shape.

また、熱硬化性の樹脂の含浸処理を行なうことなく、布帛のプリーツ形状を確保するためプリーツの山及び谷の突端部分を縫製するようにした技術も本出願人等により提案されている（特許文献２）。 In addition, the present applicant has proposed a technique for sewing the ridges and valleys of the pleats so as to ensure the pleated shape of the fabric without impregnation with a thermosetting resin (patent) Reference 2).

以上の従来技術では、濾布はPTFE等の高耐熱性の短繊維（ステープル繊維）を素材としており、ニードルパンチングにより濾布用の不織布に仕立てた状態では剛性が足りないため、特許文献１の熱硬化樹脂の含浸や特許文献２のようなプリーツ形状の確保のための縫製等の手段が必須であったが、布帛自体でプリーツ形状を確保し得る濾布用の繊維素材として、スパンボンド不織布が注目されている。即ち、スパンボンド不織布は、紡糸ノズルから押出し成形されたポリエステル等のフィラメント（無限長繊維）を直接堆積して成形するため強度（剛性）が高い不織布とすることができ、そのため、プリーツ成形後の形状保持性が高く、特許文献１や特許文献２のようなプリーツ形状を維持するための樹脂含浸や縫製といった手段が不要である。バグフィルタ用の布帛素材としてのスパンボンド不織布については特許文献３や特許文献４等を参照されたい。 In the above prior art, the filter cloth is made of high heat-resistant short fibers (staple fibers) such as PTFE, and is insufficient in rigidity when prepared as a nonwoven fabric for filter cloth by needle punching. Means such as impregnation with thermosetting resin and sewing for securing a pleated shape as in Patent Document 2 were essential, but as a fiber material for a filter cloth that can secure the pleated shape by the fabric itself, a spunbond nonwoven fabric Is attracting attention. That is, the spunbonded nonwoven fabric can be formed into a nonwoven fabric with high strength (rigidity) by directly depositing and molding filaments (infinitely long fibers) such as polyester extruded from a spinning nozzle. Shape retention is high, and means such as resin impregnation and sewing for maintaining a pleated shape as in Patent Document 1 and Patent Document 2 is unnecessary. For the spunbond nonwoven fabric as the fabric material for the bag filter, refer to Patent Document 3, Patent Document 4, and the like.

特開２００７−２３７１６０号公報JP 2007-237160 A 特開２０１２−２２３７０１号公報JP 2012-223701 A 特開２０１２−１７５２９号公報JP 2012-17529 A 特開２０１２−８６１１９号公報JP 2012-86119 A

布帛をプリーツ成形することにより濾布を形成する場合、剛性が高い布帛であるスパンボンド不織布であっても濾布の剛性は、焼却炉の集塵装置用のバグフルタとしては必須となる逆洗操作時（濾布の内側より空気パルスを印加することにより濾布場のダストの叩き落としを行なう操作）に濾布の筒形状はもとよりプリーツ形状をも損なうことがないように、濾布の内側にリテーナを配設することが必須である。しかしながら、リテーナとしては、鋼線を溶接により籠型構造にしたものが通常であるが、高温の廃棄物処理の厳しい使用環境では腐食等の早期の損傷の恐れがあり、濾布の交換と同時にリテーナの補修が必要となったり、場合によってはリテーナそのものの交換が必要となることもあった。リテーナの素材としてステンレス鋼線を採用することにより耐久性向上を実現することができようが、コストが著しく増大する。そこで、布帛を素材とするプリーツ形状の濾布を採用したバグフィルタにおいて、本発明は、バグフィルタ自身にプリーツ形状の維持機能を兼備させるような構造上の工夫を加えることにより、従来は必要であったリテーナを必要とすることなく、また、従来の別体型のリテーナとの対比において、コスト上の増加を伴うことなく、逆洗操作においてもプリーツ形状を維持し得るバグフィルタの新規な構造を提供することを目的とする。 When forming a filter cloth by pleating the cloth, the rigidity of the filter cloth is a necessary backflushing operation for a bag collector for an incinerator dust collector even if it is a spunbond nonwoven fabric, which is a highly rigid cloth. In order to prevent damage to the cylindrical shape of the filter cloth as well as the pleated shape, it is sometimes necessary to apply the air pulse from the inside of the filter cloth. It is essential to provide a retainer. However, as a retainer, a steel wire is usually made into a saddle type structure by welding, but there is a risk of early damage such as corrosion in a severe use environment for high-temperature waste disposal, and at the same time as replacing the filter cloth The retainer needs to be repaired or the retainer itself may need to be replaced. Although the use of stainless steel wire as the retainer material can improve durability, the cost is significantly increased. Therefore, in a bag filter employing a pleated filter cloth made of fabric, the present invention is conventionally required by adding structural ingenuity that allows the bag filter itself to have a function of maintaining the pleat shape. The new structure of the bag filter that can maintain the pleated shape even in the backwashing operation without the increase in cost in comparison with the conventional separate type retainer without requiring the retainer. The purpose is to provide.

この発明にあっては、筒状をなし、プリーツ状の布帛よりなる濾布本体と、筒状をなし、濾布本体の長手方向一端に縫着された口元布と、有底筒状をなし濾布本体の長手方向他端に縫着された底布とを具備したバグフィルタであって、濾布本体を内側から補強する補強具を具備し、この補強具は、バグフィルタの内部における長手方向の少なくとも一箇所に配置され、金属を素材とし、バグフィルタの内周面に全周において対向するように配置され、濾布本体の筒形状及びプリーツ確保するための環状補強部材と、布帛より構成され、前記環状補強部材をバグフィルタに逢着構造にて連結する連結具とを具備したバグフィルタが提供される。 In the present invention, the filter cloth body made of a pleated cloth is formed in a tubular shape, the tubular cloth, the mouth cloth sewn at one end in the longitudinal direction of the filter cloth body, and the bottomed tubular shape is formed. A bag filter having a bottom cloth sewn to the other longitudinal end of the filter cloth body, the bag filter comprising a reinforcing tool for reinforcing the filter cloth body from the inside, and the reinforcing tool has a longitudinal length inside the bag filter. An annular reinforcing member for securing a cylindrical shape and pleats of the filter cloth body, which is arranged at least in one direction, made of metal, and opposed to the inner circumferential surface of the bag filter in the entire circumference, and the fabric There is provided a bag filter comprising a connecting tool configured to connect the annular reinforcing member to the bag filter in a fastening structure.

布帛より成る連結具は、環状補強部材の実質的全長において環状補強部材を包囲しつつ、対向長手方向縁部が縫着された被覆布と、バグフィルタの略々全長に亘り延設された縦布とから構成することができ、この場合、縦布は、長手方向の中間部においては少なくとも対向する被覆布に縫着され、長手方向の一端においては口元布の対向内面に縫着され、長手方向の他端においては底布の対向内面に縫着される。縦布は、バグフィルタの長手方向に延びる所要の外径の金属製棒状体等の補強部材を包囲逢着するようにすることも可能である。環状補強部材を包囲する被覆布を濾布本体の対向内面に直接縫着する構造も可能である。 The connecting member made of a cloth surrounds the annular reinforcing member in substantially the entire length of the annular reinforcing member, and has a longitudinally extended length extending substantially over the entire length of the bag filter, and a covering fabric sewn on the opposite longitudinal edges. In this case, the vertical cloth is sewn to the covering cloth facing at least in the middle portion in the longitudinal direction, and is sewn to the facing inner surface of the mouth cloth at one end in the longitudinal direction. At the other end in the direction, it is sewn to the opposite inner surface of the bottom cloth. The vertical cloth can surround and attach a reinforcing member such as a metal rod having a required outer diameter extending in the longitudinal direction of the bag filter. A structure in which the covering cloth surrounding the annular reinforcing member is directly sewn to the opposing inner surface of the filter cloth main body is also possible.

濾布本体を構成する布帛としては、強度が高いプリーツ成形性の良好な素材としてポリエステルを素材とするスパンボンド布をプリーツ成形することにより構成することができる。 The cloth constituting the filter cloth main body can be constituted by pleating a spunbonded cloth made of polyester as a material having high strength and good pleat formability.

本発明バグフィルタにおいては、布帛より成る外皮をバグフィルタに逢着構造とした金属製環状補強部材が濾布の内周に沿って配置された一体構造となっており、濾布の筒形状及びプリーツ形状を金属製環状補強部材により簡易かつ確実に維持することができる。本発明によるプリーツ補強構造の一体化は、従来のバグフィルタにおいて濾布の筒形状及びプリーツ形状維持のため使用されていた、別体のリテーナを不要とすることができる。本発明における環状補強部材の縫製による一体化は、従来のバグフィルタとの比較ではバグフィルタ単品とみればコストの明らかな増大要因であるが、リテーナのような追加部品を省くことができ、リテーナも含めた単純比較ではコストの大幅な削減が可能である。本発明のバグフィルタにおいて、金属製環状補強部材は交換時に再利用は不可能ではないが、基本的には使い捨てであり、再使用を前提とする従来のリテーナと比較した弱点となり得るが、普通鋼材よりなる通常のリテーナは耐久性は現実にはそれほどでもなく、バグフィルタ交換時の補修は必要であり、そのコストも加味するとトータルのランニングコストとしては低減を期待することができる。そして、濾布の素材としてスパンボンドを使用した場合は、濾布自体の剛性が非常に高いため、環状補強部材を直接濾布対向面に逢着する最も簡易な連結構造を採用することができ、構成の簡易化を実現しつつ逆洗操作に対しても高い耐久性を得ることができ、それ故に長寿命であることからランニングコストの一層の低減を実現することができる。 The bag filter according to the present invention has an integral structure in which a metal annular reinforcing member having a cloth outer skin attached to a bag filter is disposed along the inner periphery of the filter cloth, and the tubular shape of the filter cloth and the pleats. The shape can be easily and reliably maintained by the metal annular reinforcing member. The integration of the pleated reinforcement structure according to the present invention can eliminate the need for a separate retainer that has been used in the conventional bag filter for maintaining the tubular shape and pleated shape of the filter cloth. The integration of the annular reinforcing member by sewing in the present invention is an obvious increase factor of cost when viewed as a single bag filter in comparison with a conventional bag filter, but additional parts such as a retainer can be omitted. A simple comparison including the cost can significantly reduce the cost. In the bag filter of the present invention, the metal annular reinforcing member is not impossible to reuse at the time of replacement, but is basically disposable and can be a weak point as compared with a conventional retainer that assumes reuse. A normal retainer made of steel material is not so durable in reality and needs to be repaired when replacing the bag filter. If the cost is taken into account, the total running cost can be expected to be reduced. And when using spunbond as the material of the filter cloth, the rigidity of the filter cloth itself is very high, so the simplest connection structure that directly attaches the annular reinforcing member to the filter cloth facing surface can be adopted, It is possible to obtain high durability against backwashing operation while realizing simplification of the configuration, and therefore, it is possible to realize further reduction in running cost because of its long life.

図１はこの布帛にプリーツ形状を付し縦方向の縫製により形成された筒状の濾布本体の側面図である。FIG. 1 is a side view of a tubular filter cloth body formed by sewing a cloth in a pleated shape and sewing in the vertical direction. 図２は図１のII−II線に沿った模式的矢視断面図及びこの断面図のＡ部の拡大図を示す。FIG. 2 is a schematic cross-sectional view taken along the line II-II in FIG. 1 and an enlarged view of a portion A of the cross-sectional view. 図３は図１の上、下端部においてプリーツを折り畳みかつミシンがけすることにより平坦化した状態の濾布本体の側面図である。FIG. 3 is a side view of the filter cloth body in a state where the pleat is folded at the upper and lower ends of FIG. 1 and flattened by sewing. 図４は濾布の端部のプリーツ部分のミシンがけによる平坦化を説明する模式的斜視図である。FIG. 4 is a schematic perspective view for explaining flattening by sewing of the pleat portion at the end of the filter cloth. 図５は図３により上、下端部を平坦化した濾布本体に口元布及び底布を逢着若しくは逢着準備した状態を示す縦断面図であり、本発明の補強具は未逢着であるが、濾布本体及び口元布及び底布に対する位置関係の説明のため図示されている。FIG. 5 is a longitudinal sectional view showing a state in which the mouth cloth and the bottom cloth are attached or prepared for attachment to the filter cloth body whose upper and lower ends are flattened according to FIG. 3, and the reinforcing tool of the present invention is unattached, It is shown for explaining the positional relationship with respect to the filter cloth body, the mouth cloth and the bottom cloth. 図６はバグフルタ一体型の本発明の第１の実施形態の補強具の全体を模式的に示す斜視図である。FIG. 6 is a perspective view schematically showing the whole of the reinforcing tool of the first embodiment of the present invention integrated with a bagfluter. 図７は図６の補強具において、金属製環状帯材を被覆布により包囲するように逢着しかつ被覆布の余白部分を長手方向連結帯に逢着した状態を模式的に示す拡大斜視図である。FIG. 7 is an enlarged perspective view schematically showing a state in which the metal annular band member is attached so as to be surrounded by the covering cloth and the blank portion of the covering cloth is attached to the longitudinal connecting band in the reinforcing tool of FIG. . 図８は、金属製環状補強部材として、円形断面のリングを使用した場合の模式的横断面図である。FIG. 8 is a schematic cross-sectional view when a ring having a circular cross section is used as the metal annular reinforcing member. 図９は、補強具の逢着を行うことによりバグハウスにワンタッチ取付け可能な完成したバグフィルタを示す模式的縦断面図である。FIG. 9 is a schematic longitudinal sectional view showing a completed bag filter that can be attached to the bag house by one-touch by attaching a reinforcing tool. 図１０は別実施形態における本発明の補強具の全体を模式的に示す斜視図である。FIG. 10 is a perspective view schematically showing an entire reinforcing tool of the present invention in another embodiment. 図１１は図１０の補強具において、金属製縦棒を逢着した被覆布により包囲するように逢着しかつ被覆布の余白部分を長手方向連結帯に逢着した状態を模式的に示す拡大斜視図である。FIG. 11 is an enlarged perspective view schematically showing a state in which the metal vertical bar is attached so as to be surrounded by the covering cloth, and the blank portion of the covering cloth is attached to the longitudinal connecting band in the reinforcing tool of FIG. is there. 図１２は、補強具の逢着並びに口元布及び底布の逢着を行うことによりバグハウス取付け可能な完成したバグフィルタを示す模式的縦断面図である。FIG. 12 is a schematic longitudinal sectional view showing a completed bag filter that can be attached to a bag house by attaching a reinforcing tool and attaching a mouth cloth and a bottom cloth. 図１３は本発明の別実施形態を示し、金属製環状補強部材を包囲した被覆布を濾布のプリーツ部に直接逢着した構造のバグフィルタの要部を示す模式的斜視図である。FIG. 13 shows another embodiment of the present invention, and is a schematic perspective view showing a main part of a bag filter having a structure in which a covering cloth surrounding a metal annular reinforcing member is directly attached to a pleat portion of a filter cloth.

以下、焼却炉の集塵装置の用途に適合させた場合についてこの発明になるバグフィルタを詳細に説明すると、バグフィルタを構成する濾布は織布若しくは不織布としては、耐熱性及び形態（筒形状及びプリーツ形状）保持性の観点から剛性が高くかつ耐熱性にも優れる紡糸ノズルからのマルチフィラメント（無限長繊維）を堆積交絡形成して成るスパンボンド不織布とすることが好ましい。スパンボンド不織布としては、目付けとして、200g/m²〜400g/m²の範囲のものが好ましく、荷重１ｋｇ屈曲試験、曲げ角度135°, 170回／分でトータル10000回の曲試験にて20〜30MPaの強度を確保することができるものを使用することが好ましい。スパンボンド不織布としては、東レ株式会社より"アクスター"なるの商品名（東レ株式会社の登録商標）で市販されているものや、東洋紡株式会社より"ベストショット" なるの商品名（東洋紡株式会社の登録商標）で市販されているものを採用可能である。 Hereinafter, the bag filter according to the present invention will be described in detail with respect to the case where it is adapted to the use of the dust collector of the incinerator. The filter cloth constituting the bag filter is a woven fabric or a non-woven fabric. (And pleated shape) It is preferable that a spunbonded nonwoven fabric is formed by stacking and forming multifilaments (infinitely long fibers) from a spinning nozzle having high rigidity and excellent heat resistance from the viewpoint of retention. The spunbonded nonwoven fabric, a basis weight, 20 preferably has a range of ^{^{200g / m 2 ~400g / m 2}} , the load 1kg bending test, bending angle 135 °, at the tune test total 10000 times with 170 times / min It is preferable to use a material that can ensure a strength of 30 MPa. Spunbond non-woven fabrics are commercially available under the trade name "Axter" from Toray Industries, Inc. (registered trademark of Toray Industries, Inc.), and the product name "Best Shot" from Toyobo Corporation (from Toyobo Corporation) (Registered trademark) commercially available.

スパンボンド不織布は必要幅にカットされ、加熱下でのプリーツ成形工程に付される。即ち、プリーツ成形のためスパンボンド不織布はプリーツ加工機を通される。プリーツ加工の温度としては150〜200℃の範囲である。このタイプのスパンボンド不織布はそのプリーツ形状を含めた筒形状が非常に高剛性であり、後述の通り、バグフィルタにおける濾布に採用した場合に、逆洗工程時の変形防止手段の構造の簡略化を図ることができる。 The spunbonded nonwoven fabric is cut to the required width and subjected to a pleating process under heating. That is, the spunbond nonwoven is passed through a pleating machine for pleating. The pleating temperature is in the range of 150 to 200 ° C. This type of spunbonded non-woven fabric has a very rigid cylindrical shape including its pleated shape. As described later, when it is used as a filter cloth in a bag filter, the structure of the deformation prevention means during the backwash process is simplified. Can be achieved.

本発明においては、バグフィルタを構成する濾布濾布としては、上述のようにスパンボンドによるものが好ましいが、濾布を構成する布帛として短繊維（ステープル繊維）を使用したニードルパンチ等による不織布を採用することも可能である。焼却炉の集塵装置用とには繊維素材としては耐熱性が要求され、基布層と、基布層の片面における有機耐熱繊維より成る濾過層とにより濾布を構成することができる。基布層に採用する無機繊維としてはガラス繊維やセラミック繊維やカーボン繊維や玄武岩繊維のような高温時の寸法安定性に優れたものが好ましく、また、これらの無機繊維を織製することにより織布（無機繊維と有機繊維の交撚及び交織も含む）とすることが高温時の形態安定性の観点からより好ましい。濾布を構成する有機耐熱性繊維としてはポリテトラフルオロエチレン(PTFE) 繊維やポリフェニレンサルファイド(PPS)繊維やｍアラミド繊維やポリイミド繊維やポリフルオロカーボン繊維を挙げることができる。これらの有機耐熱性繊維は無機繊維基布に植設一体化され、濾布層を形成せしめられる。植設一体化の技術としては周知のニードルパンチを採用することができる。即ち、有機耐熱繊維は所定ステープル長の有機耐熱繊維ウエブとされ、有機耐熱繊維ウエブは基布となる無機繊維織布上に積層されニードルパンチによってガラス繊維織布としての基布に交絡一体化せしめられる。 In the present invention, the filter cloth filter cloth constituting the bag filter is preferably made of spunbond as described above, but the nonwoven cloth made of needle punch or the like using short fibers (staple fibers) as the cloth constituting the filter cloth. It is also possible to adopt. Heat resistance is required as a fiber material for the dust collector of an incinerator, and a filter cloth can be constituted by a base cloth layer and a filter layer made of organic heat-resistant fibers on one side of the base cloth layer. Inorganic fibers used for the base fabric layer are preferably those excellent in dimensional stability at high temperatures, such as glass fibers, ceramic fibers, carbon fibers, and basalt fibers, and weaving these inorganic fibers by weaving them. From the viewpoint of form stability at high temperatures, it is more preferable to use a cloth (including woven and woven fabrics of inorganic and organic fibers). Examples of the organic heat resistant fiber constituting the filter cloth include polytetrafluoroethylene (PTFE) fiber, polyphenylene sulfide (PPS) fiber, m-aramid fiber, polyimide fiber, and polyfluorocarbon fiber. These organic heat-resistant fibers are planted and integrated with an inorganic fiber base fabric to form a filter cloth layer. A well-known needle punch can be employed as a technique for implantation integration. That is, the organic heat-resistant fiber is an organic heat-resistant fiber web having a predetermined staple length, and the organic heat-resistant fiber web is laminated on an inorganic fiber woven fabric as a base fabric and entangled with a base fabric as a glass fiber woven fabric by a needle punch. It is done.

濾布用の布帛として、短繊維のニードルパンチによる不織布を採用した場合、その低剛性ゆえに、プリーツ加工後の形状安定性が足りず、プリーツ形状の早期の潰れによるダストの補修効率の低下を見ることから特許文献１に記載のように、プリーツ加工前のポリイミド系樹脂等の熱硬化樹脂の含浸によるプリーツ形状の保持性を高める工程の実施が本発明の濾布用の布帛としては好ましい。また、特許文献２に記載のように、プリーツ形状の確保手段として、プリーツの山、谷の先端部分を縫製により一体化する技術によるプリーツ形状濾布も本発明の布帛として採用可能である。 When a non-woven fabric made of short fiber needle punches is used as a filter cloth, its low rigidity results in a lack of shape stability after pleating, and a decrease in dust repair efficiency due to early pleat shape collapse Therefore, as described in Patent Document 1, it is preferable for the filter cloth of the present invention to perform the step of improving the pleat shape retention by impregnation with a thermosetting resin such as a polyimide resin before pleating. Moreover, as described in Patent Document 2, a pleated filter cloth based on a technique for integrating the tip portions of the pleat peaks and valleys by sewing can be used as the pleated shape securing means as the fabric of the present invention.

以上本発明の実施において使用されるプリーツ成形された濾布によるバグフィルタの構造について図面を参照しながら説明すると、図１は、規定縦寸法に裁断された布帛をプリーツ成形後に縦方向に縫製（ミシンがけ）して筒形状にした濾布１０を示す。図２には濾布１０の断面形状を模式的に示しす。図２において筒状濾布１０の縦方向の接続部Ａを拡大して示しており、筒状に成形された濾布１０の長手方向端部に耐熱性繊維（セラミックやPTFE等）の織布や不織布より成る当布１１が当てられ、筒状濾布１０の長手方向に縫製（縫製ライン（ミシン目）を２１にて示す）され、これにより濾布１０の筒形状が形成される。 The structure of the bag filter by the pleated filter cloth used in the implementation of the present invention will be described with reference to the drawings. FIG. 1 shows that a fabric cut to a specified longitudinal dimension is sewn in the longitudinal direction after pleating ( The filter cloth 10 made into a cylindrical shape by sewing) is shown. FIG. 2 schematically shows a cross-sectional shape of the filter cloth 10. In FIG. 2, the longitudinal connection portion A of the cylindrical filter cloth 10 is shown in an enlarged manner, and a heat-resistant fiber (ceramic, PTFE, or the like) woven cloth is formed at the longitudinal end of the cylindrical filter cloth 10. This cloth 11 made of or non-woven fabric is applied, and sewing is performed in the longitudinal direction of the tubular filter cloth 10 (sewing line (perforation) is indicated by 21), whereby the tubular shape of the filter cloth 10 is formed.

図３及び図４はプリーツ形状の筒状濾布１０の後述する口元布及び底布に対する接合部の端部処理を示す。まず、筒状濾布１０の端部はプリーツが平坦に折り畳まれ、平坦に折り畳まれた筒状濾布１０の端部は図４に示すように縫製（ミシンがけ）され、縫製ラインを13, 15にて示す。そのため、筒状濾布１０に実質的に平坦化された筒状上端部10-1及び筒状下端部10-2が形成される。そして、図５に示すように、筒状濾布１０の筒状上端部10-1には筒状の口元布１２が被せられ縫製され、筒状濾布１０に対する口元布１２のミシン目（縫製）部分を１７にて示す。また、筒状濾布１０の下端部10-2には底布１４の一部となる筒状連結布１４´が被せられ縫製され、筒状濾布１０に対する筒状連結布１４´のミシン目部分を１９にて示す。口元布１２及び底布14, 14'は強度的には濾布１０と同程度であればよいが濾布本体１０と同程度の耐熱性は必要であり、PTFE等の耐熱繊維の織布や不織布（ニードルパンチしたもの又はプレーンなもの）により構成することができる。 3 and 4 show the end processing of the joint portion of the pleated tubular filter cloth 10 to the mouth cloth and the bottom cloth described later. First, the pleat is folded flat at the end of the tubular filter cloth 10, and the end of the folded tubular filter cloth 10 is sewn (sewn) as shown in FIG. Shown at 15. Therefore, the cylindrical upper end portion 10-1 and the cylindrical lower end portion 10-2 that are substantially flattened are formed on the cylindrical filter cloth 10. Then, as shown in FIG. 5, the cylindrical upper end portion 10-1 of the cylindrical filter cloth 10 is covered with a cylindrical mouth cloth 12 and sewn, and a perforation (sewing) of the mouth cloth 12 with respect to the cylindrical filter cloth 10 is performed. ) Part is indicated by 17. Further, the lower end portion 10-2 of the cylindrical filter cloth 10 is covered with a cylindrical connecting cloth 14 'that becomes a part of the bottom cloth 14, and is sewn. The perforated line of the cylindrical connecting cloth 14' with respect to the cylindrical filter cloth 10 is sewn. The part is indicated by 19. The mouth cloth 12 and the bottom cloths 14 and 14 'may have the same strength as the filter cloth 10 in terms of strength, but the heat resistance of the same degree as the filter cloth body 10 is necessary. A non-woven fabric (needle punched or plain) can be used.

従来は、濾布の筒形状及びプリーツ形状の確保のため、濾布と別体に鋼若しくはステンレス鋼よりなる細線を籠構造に溶接等により組み上げて構成されるリテーナが使用されるが、本発明では、このような別体のリテーナの代わりに、濾布１０の筒形状及びプリーツ形状の確保のため金属製の補強材は使用するが濾布の内部に縫製により一体化された金属を主体とする補強構造を具備させている。本発明の第１の実施形態におけるこの補強構造について説明すると、図６及び図７において、補強具は符号１６にてその全体を示す。補強具１６は、鋼材よりなる環状バンド２０を被覆布２２にて包囲させた補強部を縦方向に離間して適当数設けている。この実施形態では、環状バンド２０を被覆布２２にて包囲させてなる補強部は２個設けられるが、バグフィルタの全長が短いものでは１個で済ませることができるし、濾布が長大なものである場合は長さに応じた個数に増加させることができる。図７に示すように、環状補強バンド２０は、濾布本体１０のプリーツ部の内径全周に略等しい鋼材(SS及びSUS等)より成り、補強バンド２０を全長に亘って外周を包囲するPTFEやガラス繊維等の耐熱繊維の織布よりなる被覆布２２が設けられる。被覆布２２の余白である対向縁部を縫製（ミシン目を２３にて示す）することにより、補強バンド２０は被覆布２２による完全包囲構造となっている。図７では補強バンド２０は縦に長い断面の矩形（縦10〜15mm，横（厚み）0.2〜0.4mm）、即ち、帯状としているが、図８に示すような濾布の円形断面のリング２０´として構成し、被覆布２２により完全に包み込むように縫製することができる。図６に示すように補強具１６は、環状バンド２０を被覆布２２にて包囲させた補強部に加えて、長手方向に延びる帯状縦布２４（被覆布２２とで本発明の連結布を構成する）を具備しており、この実施形態では縦布２４は円周方向に等間隔に３本配置される。縦布２４は、被覆布２２と同様にPTFEやガラス繊維等の耐熱繊維の織布を素材とし筒状濾布１０に対する環状バンド２０の実質的な一体的取付構造を確保するためのものであり、環状バンド２０を包囲する被覆布２２に縫着され、別途縫製でもよいし、補強バンド２０を介しての被覆布２２の逢着のためのミシン目２３と共縫いされるようにしてもよい。鋼材より成る補強バンド２０は、筒状濾布１０の内周に沿って位置するため、逆洗操作時に内側より加わるパルス圧によって筒状濾布１０が叩かれたときに、筒状濾布１０を受け止め、その筒形状及びプリーツ形状を保持する。このとき、縦布２４に幾分の外力が加わり得るが、これに十分な余裕で耐え得る強度を縦布２４は有する必要があり、その幅寸法、さらには本数を設計する必要がある。 Conventionally, in order to secure the tubular shape and pleat shape of the filter cloth, a retainer constructed by assembling fine wires made of steel or stainless steel separately from the filter cloth by welding or the like is used. Then, instead of such a separate retainer, a metal reinforcing material is used to secure the cylindrical shape and pleated shape of the filter cloth 10, but the metal integrated by sewing inside the filter cloth is mainly used. A reinforcing structure is provided. The reinforcing structure in the first embodiment of the present invention will be described. In FIG. 6 and FIG. The reinforcing tool 16 is provided with an appropriate number of reinforcing portions in which an annular band 20 made of a steel material is surrounded by a covering cloth 22 so as to be separated in the vertical direction. In this embodiment, two reinforcing portions are provided by enclosing the annular band 20 with the covering cloth 22. However, if the bag filter has a short overall length, only one can be used, and the filter cloth has a long length. If it is, the number can be increased according to the length. As shown in FIG. 7, the annular reinforcing band 20 is made of a steel material (SS, SUS, etc.) substantially equal to the entire inner circumference of the pleat portion of the filter cloth body 10, and surrounds the outer circumference of the reinforcing band 20 over the entire length. A covering cloth 22 made of a heat-resistant fiber woven cloth such as glass fiber is provided. The reinforcing band 20 has a complete surrounding structure by the covering cloth 22 by sewing the opposing edge which is a blank of the covering cloth 22 (indicated by a perforation 23). In FIG. 7, the reinforcing band 20 has a rectangular shape with a long longitudinal section (longitudinal 10-15 mm, lateral (thickness) 0.2-0.4 mm), that is, a belt-like shape, but a ring 20 with a circular cross section of a filter cloth as shown in FIG. ′ And can be sewn so as to be completely wrapped by the covering cloth 22. As shown in FIG. 6, the reinforcing tool 16 includes a belt-like vertical cloth 24 (with the covering cloth 22 that forms the connecting cloth of the present invention) in addition to the reinforcing portion in which the annular band 20 is surrounded by the covering cloth 22. In this embodiment, three vertical fabrics 24 are arranged at equal intervals in the circumferential direction. The vertical cloth 24 is for securing a substantially integral mounting structure of the annular band 20 to the tubular filter cloth 10 by using a woven cloth of heat-resistant fiber such as PTFE or glass fiber as the covering cloth 22. Alternatively, it may be sewn to the covering cloth 22 surrounding the annular band 20 and may be sewn separately, or may be sewn together with a perforation 23 for attaching the covering cloth 22 through the reinforcing band 20. Since the reinforcing band 20 made of steel is positioned along the inner periphery of the tubular filter cloth 10, when the tubular filter cloth 10 is struck by the pulse pressure applied from the inside during the backwash operation, the tubular filter cloth 10. Receives and retains its cylindrical and pleated shapes. At this time, some external force can be applied to the vertical cloth 24. However, the vertical cloth 24 needs to have sufficient strength to withstand this, and it is necessary to design the width and the number of the cloth.

図６のようにして構成された金属製環状バンド２０、被覆布２２及び縦布２４よりなる補強具１６は、図５では筒状濾布１０の内部に挿入された状態（未縫着の状態）にて示されている。そして、縦布２４は、口元布１２及び底布１４の筒状連結布１４´部分に別途縫着することによりバグフィルタに連結しても良いが、この実施形態においては、上端側では、口元布１２へのスナップリング２８の縫着の際に共縫い又は別途縫製され、底布１４と筒状連結布１４´との縫着の際に共縫いされ又は別途縫製される。即ち、図９は、補強具１６を組み込むことによりバグフィルタとして組み立てた状態が示され、口元側では、特許文献1と同様なワンタッチ式スナップリング式のバグハウス装着装置（本出願人会社である株式会社相模商会のイージースナップなる商品名（株式会社相模商会の登録商標）のもの）を仕込んだ形で構成されている。図９において、金属製スナップリング２８は、弾性鋼材帯片にて形成される。図５の状態から折り返された状態において口元布１２により包囲され、口元布１２の外側の折り返し部を対向面に縫着することによりスナップリング２８は口元布１２に縫いこまれる（縫着ラインを２９にて示す）。縫着ライン２９による縫い付けの際に、補強具１６における縦布２４の上端が共縫い（縫着ライン１７）することができる（別縫いでも良い）。他方、底布１４については、外周が筒状に窄められ、底布１４の別体部分である筒状連結布１４´に縫い付けられ（縫着ラインを３０にて示す）、この際補強具１６の縦布３本の縦布２４の下端を共縫いすることができる。これにより閉鎖したバグフィルタの下端が完成されると共に、金属製環状補強バンド２０を被覆布２２にて包囲縫着しかつ３本の縦布２４に縫着してなる補強具１６のバグフィルタを構成する濾布１０、口布１２及び底布１４への一体化が行なわれる。 The reinforcing tool 16 composed of the metal annular band 20, the covering cloth 22, and the vertical cloth 24 configured as shown in FIG. 6 is inserted into the tubular filter cloth 10 in FIG. 5 (unsewn state). ). The vertical cloth 24 may be connected to the bag filter by separately sewing the tubular connecting cloth 14 'portion of the mouth cloth 12 and the bottom cloth 14, but in this embodiment, at the upper end side, When the snap ring 28 is sewn to the cloth 12, it is stitched together or separately, and when the bottom cloth 14 and the tubular connecting cloth 14 ′ are sewn together, they are sewn together or sewn separately. That is, FIG. 9 shows a state assembled as a bag filter by incorporating the reinforcing tool 16. On the mouth side, a one-touch type snap ring type bag house mounting device similar to Patent Document 1 (the present applicant company). The product is made up of a product name (a registered trademark of Sagami Shokai Co., Ltd.) that is an easy snap of Sagami Shokai Co., Ltd. In FIG. 9, the metal snap ring 28 is formed of an elastic steel strip. In the state of being folded from the state of FIG. 5, the snap ring 28 is sewn into the mouth cloth 12 by being surrounded by the mouth cloth 12 and sewing the folded portion outside the mouth cloth 12 to the opposite surface (sewing line is sewn). 29). When the sewing line 29 is sewn, the upper end of the vertical cloth 24 in the reinforcing tool 16 can be sewn together (sewing line 17) (separate sewing may be used). On the other hand, as for the bottom cloth 14, the outer periphery is narrowed into a cylindrical shape, and is sewn to a cylindrical connecting cloth 14 'which is a separate part of the bottom cloth 14 (sewing line is indicated by 30). The lower ends of the three vertical cloths 24 of the tool 16 can be sewn together. As a result, the bottom end of the closed bag filter is completed, and the bag filter of the reinforcing tool 16 formed by surrounding and sewing the metal annular reinforcing band 20 with the covering cloth 22 and sewing it to the three vertical cloths 24 is provided. Integration with the filter cloth 10, the mouth cloth 12, and the bottom cloth 14 which comprise is performed.

このように構成されたバグフィルタのバグハウスへの装着は、この実施形態では、特許文献１に記載と同方式であり、弾性材を素材とする円環状のスナップリング２８が外周に凹部28-1を有しており、スナップリング２８の外周凹部28-1が、バグハウスに多数設置されるバグフィルタ取付孔の対応の内周縁にスナップ式に嵌合することによりバグフィルタの装着がワンタッチ式に行なわれことで便利である。しかしながら、バグフィルタのバグハウスに対するこのような取付方法に限らず、本発明のバグフィルタのバグハウスに対する取り付けは公知の他の如何なる手法、例えば、ねじ式の締結バンドによる取付方式にも採用可能であることはいうまでもない。 In this embodiment, the bag filter constructed as described above is mounted in the bag house in the same manner as described in Patent Document 1, and an annular snap ring 28 made of an elastic material is formed on the outer periphery of the recess 28- 1 is attached, and the outer peripheral recess 28-1 of the snap ring 28 is snap-fitted into the corresponding inner peripheral edge of the bag filter mounting hole installed in the bag house, so that the bag filter can be mounted by one touch. It is convenient to be done. However, the method of attaching the bag filter to the bag house is not limited to such a method of attaching the bag filter to the bag house, and any other known method, for example, a screw type fastening band can be used. Needless to say.

以上説明の第１の実施形態において、補強具１６は、バグフィルタの長手方向の２箇所において位置する金属製の補強バンド２０を備えており、補強バンド２０は被覆布２２及び縦布２４（図７）によってバグフィルタの上下端の口元布１２及び底布１４に縫製により強固に連結した構造となっている。そのため、補強バンド２０は、バグフィルタの定期的なクリーニング（逆洗操作）のため内側からかかるパルス空気圧に対により叩かれても、濾布１０は補強バンド２０と当たることによりそれ以上に潰れてしまうことを防止することができ、プリーツ形状も維持することができる。このような、本発明の濾布と縫製により一体化した補強具１６の構造は、従来のリテーナのような高価な別部品を不要とする。 In the first embodiment described above, the reinforcing tool 16 includes the metal reinforcing bands 20 located at two positions in the longitudinal direction of the bag filter, and the reinforcing band 20 includes the covering cloth 22 and the vertical cloth 24 (see FIG. 7), the bag filter is firmly connected to the base cloth 12 and the bottom cloth 14 at the upper and lower ends by sewing. Therefore, even if the reinforcing band 20 is struck by a pair of pulse air pressure applied from the inside for periodic cleaning (back washing operation) of the bag filter, the filter cloth 10 is further crushed by hitting the reinforcing band 20. Can be prevented, and the pleated shape can also be maintained. Such a structure of the reinforcing member 16 integrated with the filter cloth of the present invention by sewing does not require an expensive separate part such as a conventional retainer.

図１０は別実施形態の補強具１１６を示しており、補強具１１６は鋼材よりなる補強バンド１２０を被覆布１２２にて包囲させた補強部を縦方向に離間して適当数設けている構成は第１の実施形態の補強具１６と同様である。しかしながら、帯状縦布１２４が、鋼線１２５（本発明の金属製縦補強材）を包囲し、ミシンがけにより縫着されている、より剛性の向上を図った構造の点が相違する。鋼線１２５の太さとしては、通常の100〜200mmといった口径の濾布の場合0.7〜2mmといった外径とすることができる。鋼線１２５の包囲・縫着のためのミシンがけのラインを図1０で１２７にて示す。図９に示すように補強具１１６は円周方向に等間隔に３本配置される。そして、図１３に示すように鋼線１２５を包囲・縫着した包囲布１２２の余白部分が縦布１２４に縫着される。被覆布１２２に対する縦布１２４の縫着は別縫製でもよいが、図１０の実施形態では、金属製の補強バンド１２０を包囲する被覆布１２２の縫製ライン１２３と共縫いしても良い。この実施形態においては、縦布１２４が鋼線１２５を縫着しかつ円周方向に複数配置されていることから、補強具１１６は縦方向にも剛性を持たせることができる有利性がある。図１２は底布１１４を図１１と同様に縫着することによりバグフィルタとして完成させた状態を示す。鋼線１２５を包囲・縫着後の縦布１２４の余白部分が上端では口元布１１２に縫製ライン１２９により共縫いされ、下端では底布１１４に縫製ライン１３０により共縫いされることにより、バグフィルタ内部での補強具１１６の組み付け、即ち、縫着構造が得られる。 FIG. 10 shows a reinforcing member 116 according to another embodiment. The reinforcing member 116 has a configuration in which a suitable number of reinforcing portions, each including a reinforcing band 120 made of steel and surrounded by a covering cloth 122, are provided apart in the vertical direction. This is the same as the reinforcing tool 16 of the first embodiment. However, the belt-like vertical cloth 124 surrounds the steel wire 125 (the metal vertical reinforcing material of the present invention) and is sewn by sewing, and the structure is further improved in rigidity. The thickness of the steel wire 125 can be an outer diameter of 0.7 to 2 mm in the case of a normal filter cloth having a diameter of 100 to 200 mm. A sewing line for encircling and sewing the steel wire 125 is shown at 127 in FIG. As shown in FIG. 9, three reinforcing tools 116 are arranged at equal intervals in the circumferential direction. Then, as shown in FIG. 13, the blank portion of the surrounding cloth 122 surrounding and sewing the steel wire 125 is sewn to the vertical cloth 124. The vertical cloth 124 may be sewn separately from the covering cloth 122. However, in the embodiment of FIG. 10, the sewing may be performed together with the sewing line 123 of the covering cloth 122 surrounding the metal reinforcing band 120. In this embodiment, since a plurality of vertical cloths 124 are sewn to the steel wire 125 and arranged in the circumferential direction, there is an advantage that the reinforcing tool 116 can have rigidity in the vertical direction. 12 shows a state in which the bottom cloth 114 is completed as a bag filter by sewing in the same manner as in FIG. The blank portion of the vertical cloth 124 surrounding and sewing the steel wire 125 is sewn together at the upper end to the mouth cloth 112 by the sewing line 129, and the lower end is co-sewn to the bottom cloth 114 by the sewing line 130. Assembling of the reinforcing tool 116 inside, that is, a sewn structure is obtained.

図１３はこの発明の更に別実施形態の補強具２１６を示しており、この実施形態においては補強具１１６は金属製の補強バンド２２０を被覆布２２２にて包囲させてなる補強部から構成され、第１及び第２実施形態における連結体のような縦方向の連結部材を省略し、補強バンド２２０を包囲・縫着（ミシンがけラインを２２１にて示す）する被覆布２２２（この実施形態における本発明の連結布を構成する）を濾布のプリーツ部に直接縫着している構成を特徴とする。この実施形態では、補強バンド２２０を包囲縫着した被覆布２２２の余白部分を濾布のプリーツ部の谷部分に縫着している。被覆布２２２のプリーツ部に対する縫着部を２２３にて示し、縫着部２２３はプリーツ谷部分を２つ飛びで濾布に縫着している。この実施形態のような濾布１０に対する補強具２１６の直接縫製のような簡易補強構造でも、濾布１０の素材がスパンボンド布のように剛性が高い場合には逆洗操作に対して十分な形状保持機能を確保することができる。 FIG. 13 shows a reinforcing member 216 according to still another embodiment of the present invention. In this embodiment, the reinforcing member 116 is composed of a reinforcing portion formed by surrounding a metal reinforcing band 220 with a covering cloth 222. A cover cloth 222 (the book in this embodiment) that omits the connecting member in the vertical direction such as the connecting body in the first and second embodiments and surrounds and sews the reinforcing band 220 (the sewing line is indicated by 221). The connecting cloth of the invention is directly sewn to the pleat portion of the filter cloth. In this embodiment, the blank portion of the covering cloth 222 that surrounds and sews the reinforcing band 220 is sewn to the valley portion of the pleat portion of the filter cloth. A stitched portion of the covering cloth 222 with respect to the pleated portion is indicated by 223, and the stitched portion 223 is sewn to the filter cloth by skipping two pleated valley portions. Even in a simple reinforcing structure such as direct sewing of the reinforcing tool 216 with respect to the filter cloth 10 as in this embodiment, when the material of the filter cloth 10 is highly rigid like a spunbond cloth, it is sufficient for the backwash operation. A shape maintaining function can be ensured.

尚、本発明の実施形態において、ミシン目（逢着ライン）15, 13, 17, 19, 23, 29, 30, 123,127,221,223等は１本であったり複数本であったり混在しており、これは図示の簡明を意図したものであって、必要な縫製強度が得られる本数とすることは言うまでもない。また、被覆布22, 122, 124, 22は必ずしも全周若しくは全長で金属部（バンド20, 20, 120, 220若しくはリング又は鋼線125）を包囲させる必要はなく、所期の縫製強度が得られるものであれば、周方向若しくは長さ方向に部分的に包囲状態を欠いていても本願発明の範囲を逸脱するものではないことはいうまでもない。 In the embodiment of the present invention, the perforations (attachment lines) 15, 13, 17, 19, 23, 29, 30, 123, 127, 221, 223, etc. are one or plural, and this is illustrated. Needless to say, the number of the necessary sewing strength is obtained. In addition, the covering cloth 22, 122, 124, 22 does not necessarily have to surround the metal part (band 20, 20, 120, 220 or ring or steel wire 125) on the entire circumference or the entire length, and the desired sewing strength can be obtained. Needless to say, even if the surrounding state is partially lacking in the circumferential direction or the length direction, it does not depart from the scope of the present invention.

１０…濾布
１２…口布
16, 116, 216…補強具
20, 120, 220…金属製補強バンド
22, 122, 222…被覆布（本発明の連結布）
24, 124…縦布（本発明の連結布）
２８…スナップリング
１２５…鋼線（本発明の金属製縦補強材） 10 ... filter cloth 12 ... cloth
16, 116, 216… Stiffener
20, 120, 220… Metal reinforcement band
22, 122, 222 ... Covering cloth (connecting cloth of the present invention)
24, 124… Vertical cloth (the connecting cloth of the present invention)
28 ... Snap ring 125 ... Steel wire (metal longitudinal reinforcing material of the present invention)

Claims

A filter cloth body made of a pleated fabric, a tubular shape, a mouth cloth sewn at one end in the longitudinal direction of the filter cloth body, a bottomed tubular shape, a longitudinal direction of the filter cloth body, etc. A bag filter having a bottom cloth sewn to an end, comprising a reinforcing tool for reinforcing the filter cloth body from the inside, and the reinforcing tool is disposed at least in one longitudinal direction inside the bag filter. The annular reinforcing member is made of a metal and is arranged so as to face the inner peripheral surface of the bag filter so as to face the entire circumference, and is composed of an annular reinforcing member for securing the tubular shape and pleats of the filter cloth body, and the cloth, A bug filter comprising: a coupling tool for coupling the bag filter to the bag filter with a fastening structure.

In the invention according to claim 1, the connector includes a covering cloth in which the opposing longitudinal direction edge portions are sewn while substantially enclosing the annular reinforcing member around substantially the entire circumference of the annular reinforcing member, and a bag filter. A longitudinal cloth extending over the entire length, the longitudinal cloth being sewn to the covering cloth at least at a portion opposed to the middle in the longitudinal direction, and facing the mouth cloth at one end in the longitudinal direction. A bag filter sewn on the inner surface and sewn on the opposite inner surface of the bottom cloth at the other end in the longitudinal direction.

The invention according to claim 2, comprising at least one metal longitudinal reinforcement extending substantially the entire length inside the bag filter, wherein the longitudinal cloth surrounds the metal longitudinal reinforcement around the entire circumference. Bug filter attached at

In the first aspect of the present invention, the cloth constituting the reinforcing member is formed of a covering cloth that is attached while covering the annular reinforcing member over substantially the entire circumference, and the covering cloth is directly on the opposing inner surface of the filter cloth body. Bag filter being sewn.

5. The bag filter according to any one of claims 1 to 4, wherein the pleated fabric constituting the filter cloth body is made of a spunbonded cloth made of a polyester resin as a raw material.