JP2019130472A - Staple fiber non-woven fabric - Google Patents
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Abstract
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本発明は、工場やビルから排気される被処理ガスに含まれる粉塵を捕集するロールフィルタ用の短繊維不織布に関するものである。 The present invention relates to a short fiber nonwoven fabric for a roll filter that collects dust contained in a gas to be treated exhausted from a factory or a building.
たとえば塗装ブースの排気ガスは揮発性有機化合物（以下ＶＯＣ）を多く含んでおり、環境保全の観点から塗装ブースの後段にはＶＯＣ成分を吸着除去する吸着材を搭載したＶＯＣ処理装置が設置される。 For example, the exhaust gas in the painting booth contains a large amount of volatile organic compounds (hereinafter referred to as VOC), and from the viewpoint of environmental protection, a VOC treatment device equipped with an adsorbent for adsorbing and removing VOC components is installed at the latter stage of the painting booth. .
ところが塗装ブースの排気ガスには製品を塗装する際に使用された余剰塗料で構成される塗料ミストが多く含まれており、この塗料ミストが吸着材表面を被覆して劣化させることでＶＯＣ処理装置の寿命を著しく短くしてしまう。そこで吸着材の劣化を防止する目的でＶＯＣ処理装置の前段に塗料ミスト等の粉塵を捕集するフィルタユニットが設置されている。 However, the exhaust gas in the painting booth contains a lot of paint mist composed of surplus paint used when painting the product, and this paint mist covers the surface of the adsorbent and deteriorates it, so that the VOC treatment equipment Will significantly shorten the lifespan. Therefore, a filter unit that collects dust such as paint mist is provided in front of the VOC processing apparatus for the purpose of preventing the deterioration of the adsorbent.
フィルタユニットの一例として巻取式ロールフィルタユニットがある。一般的な巻取式ロールフィルタユニットは、粉塵捕集用濾材を円筒状に加工したロールフィルタが巻出し軸に設置されており、巻取り軸に設置された芯棒で濾材を自動で巻き取る構成となっている。巻出し軸と巻取り軸との間には被処理ガスを通気するための開口部が備えられており、濾材が開口部の全面を覆うように常時設置されることで、被処理ガスに含まれる粉塵を濾材で捕集し、清浄ガスを排気する。 An example of the filter unit is a take-up roll filter unit. A typical roll-type roll filter unit has a roll filter that is formed by filtering dust collecting filter media into a cylindrical shape, and is installed on the unwinding shaft. The filter media is automatically wound by a core rod installed on the winding shaft. It has a configuration. An opening for venting the gas to be processed is provided between the unwinding shaft and the winding shaft, and the filter medium is always installed so as to cover the entire surface of the opening. Dust collected with filter media and exhausting clean gas.
濾材で捕集された粉塵量が経時的に増加することで開口部の濾材の圧力損失が上昇すると、巻取式ロールフィルタユニットは巻取り軸を駆動させて粉塵を捕集した使用済み濾材を巻き取り回収し、濾材の未使用部分が再び開口部を覆うことで圧力損失が上昇することを防止している。 When the pressure loss of the filter media at the opening increases as the amount of dust collected by the filter media increases over time, the take-up roll filter unit drives the take-up shaft to collect the used filter media that collects dust. It is wound up and collected, and the unused portion of the filter medium covers the opening again to prevent the pressure loss from increasing.
巻取り軸の駆動方法はさまざまであるが、開口部の濾材の圧力損失が一定の値を保つように自動制御する方法や、一定時間毎に一定量の濾材を巻き取る方法などが挙げられる。 There are various methods for driving the winding shaft, and examples include a method of automatically controlling the pressure loss of the filter medium at the opening to maintain a constant value, and a method of winding a certain amount of filter medium every certain time.
ところで、巻取式ロールフィルタユニットは巻出し軸に装填されたロールフィルタが巻取り軸に装填された芯棒で順次巻き取られる構成をとることから、被処理ガスが通気される開口部で濾材がたるまないように一定の張力が濾材に与えられた状態を維持する。そのため、ロールフィルタの濾材には一定の強度および剛性が求められる。 By the way, the take-up type roll filter unit has a configuration in which the roll filter loaded on the unwinding shaft is sequentially wound by the core rod loaded on the take-up shaft. A state in which a constant tension is applied to the filter medium is maintained so as not to sag. Therefore, the filter medium of the roll filter is required to have a certain strength and rigidity.
さらにロールフィルタは円筒状に圧縮された形状で装填されているところから開口部に移動して単板状になる時に粉塵保持量を低下させたいために濾材の厚みが十分復元されている必要がある。そのため、濾材を構成する短繊維は必然的に繊維径が４０μｍ以上の比較的太く剛性のある素材から選定する必要があり、捕集性能は質量法で８５％程度までの低い効率しか得られていない。 Furthermore, the roll filter needs to be sufficiently restored in thickness in order to reduce the dust holding amount when it is loaded from a cylindrically compressed shape and moved to the opening to become a single plate. is there. Therefore, it is necessary to select the short fibers constituting the filter medium from a relatively thick and rigid material having a fiber diameter of 40 μm or more, and the collection performance is as low as about 85% by mass method. Absent.
また、濾材に厚み復元性を持たせるため短繊維同士をエステルウレタン系樹脂によって結合させる方法が報告されている（特許第５２４１４５２）が、結合のために使用した樹脂が繊維表面を覆うことで繊維表面積を低下させてしまい、特に塗料ミストに対しては十分な粉塵捕集性能が得られていない。 In addition, a method in which short fibers are bonded to each other with an ester urethane-based resin in order to give the filter medium thickness restoration properties (Patent No. 5241458) has been reported, but the fiber used by covering the fiber surface with the resin used for bonding The surface area is reduced, and sufficient dust collection performance is not obtained particularly for paint mist.
そこで本発明は上記課題に鑑みなされ、その目的は、厚み復元性が十分に得られ、被処理ガスに含まれる粉塵を高効率に捕集しながらも高い粉塵保持量を発揮するができるロールフィルタ用短繊維不織布を提供することにある。 Accordingly, the present invention has been made in view of the above-mentioned problems, and its purpose is to provide a roll filter capable of exhibiting a high dust holding amount while sufficiently recovering the thickness and collecting dust contained in the gas to be treated with high efficiency. It is to provide a short fiber nonwoven fabric for use.
本発明者らは上記課題を解決するため、鋭意研究した結果、ついに本発明を完成するに到った。すなわち、本発明は以下の通りである。
１．被処理ガスに含まれる粉塵を捕集するロールフィルタ用の短繊維不織布であり、芯鞘型複合熱接着短繊維と非接着短繊維とから構成され、目付が８０ｇ／ｍ２以上２００ｇ／ｍ２以下、見かけ密度が０．０１５ｇ／ｃｃ以上０．０４０ｇ／ｃｃ以下、平均繊維径が１０μｍ以上２５μｍ以下、線速２．５ｍ／ｓで通気させた時の、初期圧力損失が８０Ｐａ以上２００Ｐａ以下であり、かつ、比色法平均効率が５５％以上であることを特徴とする短繊維不織布。
２．ロールフィルタに加工する前の平均厚み（Ａ）とロールフィルタに加工後に広げた際の平均厚み（Ｂ）とから以下の式（１）にて求まる復元率（％）が９０％以上であることを特徴とする上記１に記載の短繊維不織布。
復元率（％）＝（Ｂ／Ａ）×１００
３．前記被処理ガスは塗料を含む排気ガスであり、前記粉塵は塗料ミストであることを特徴とする上記１または２に記載の短繊維不織布。
４．前記芯鞘型熱接着短繊維は自身の溶融によって前記非接着短繊維と接着していることを特徴とする前記１〜３のいずれか１つに記載の短繊維不織布。
５．前記芯鞘型複合熱接着短繊維と前記非接着短繊維との混繊比率が６０：４０〜９０：１０であることを特徴とする前記１〜４のいずれか１つに記載の短繊維不織布。
As a result of intensive studies to solve the above problems, the present inventors have finally completed the present invention. That is, the present invention is as follows.
1. It is a short fiber nonwoven fabric for roll filters that collects dust contained in the gas to be treated, and is composed of core-sheath type composite heat-bonded short fibers and non-bonded short fibers, and has a basis weight of 80 g / m 2 or more and 200 g / m 2. The initial pressure loss is 80 Pa or more and 200 Pa or less when aerated at an apparent density of 0.015 g / cc or more and 0.040 g / cc or less, an average fiber diameter of 10 μm or more and 25 μm or less, and a linear velocity of 2.5 m / s. A short fiber nonwoven fabric characterized by having a colorimetric average efficiency of 55% or more.
2. The restoration rate (%) obtained by the following formula (1) from the average thickness (A) before processing into a roll filter and the average thickness (B) when expanded after processing into a roll filter is 90% or more. 2. The short fiber nonwoven fabric according to 1 above.
Restoration rate (%) = (B / A) × 100
3. 3. The short fiber nonwoven fabric according to 1 or 2 above, wherein the gas to be treated is an exhaust gas containing a paint, and the dust is a paint mist.
4). 4. The short fiber nonwoven fabric according to any one of 1 to 3, wherein the core-sheath-type heat-bonded short fibers are bonded to the non-bonded short fibers by melting themselves.
5). 5. The short fiber nonwoven fabric according to any one of the above 1 to 4, wherein a blend ratio of the core-sheath type composite heat-bonded short fiber and the non-bonded short fiber is 60:40 to 90:10 .
本発明の短繊維不織布は、圧縮されたロールフィルタの形状から使用時に単板状になる際に、厚み復元性が十分に得られるので、被処理ガスに含まれる粉塵を高効率に捕集しながらも高い粉塵保持量を発揮することができる。 When the short fiber nonwoven fabric of the present invention is made into a single plate from the shape of the compressed roll filter, it can sufficiently recover the thickness, so that it can efficiently collect dust contained in the gas to be treated. In spite of this, a high dust holding capacity can be exhibited.
以下、本発明の実施の形態について、図を参照して詳細に説明する。なお、以下に示す実施の形態においては、同一のまたは共通する部分について図中同一の符号とし、その説明は繰り返さない。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following embodiments, the same or common parts are denoted by the same reference numerals in the drawings, and description thereof will not be repeated.
本実施の形態の短繊維不織布（濾材）は、被処理ガスに含まれる粉塵を捕集するロールフィルタ用の短繊維不織布である。本実施の形態の短繊維不織布は、芯鞘型複合熱接着短繊維と非接着短繊維とから構成され、目付が８０ｇ／ｍ２以上２００ｇ／ｍ２以下、見かけ密度が０．０１５ｇ／ｃｃ以上０．０４０ｇ／ｃｃ以下、平均繊維径が１０μｍ以上２５μｍ以下、線速２．５ｍ／ｓで通気させた時の初期圧力損失が８０Ｐａ以上２００Ｐａ以下であり比色法平均効率が５５％以上である。 The short fiber nonwoven fabric (filter material) of this Embodiment is a short fiber nonwoven fabric for roll filters which collects the dust contained in to-be-processed gas. The short fiber nonwoven fabric of the present embodiment is composed of core-sheath type composite heat-bonded short fibers and non-bonded short fibers, and has a basis weight of 80 g / m 2 to 200 g / m 2 and an apparent density of 0.015 g / cc or more. 0.040 g / cc or less, average fiber diameter of 10 μm or more and 25 μm or less, initial pressure loss when aerated at a linear speed of 2.5 m / s is 80 Pa or more and 200 Pa or less, and colorimetric method average efficiency is 55% or more. .
まず、本実施の形態のロールフィルタとそれが取り付けられる巻取式ロールフィルタユニットについて説明する。図１および図２に示すように、本実施の形態における巻取式ロールフィルタユニット１００は、ロールフィルタ１を交換可能に備えている。さらに、巻取式ロールフィルタユニット１００は、巻出し軸２、巻取り軸４、開口部６を備えている。 First, the roll filter of this Embodiment and the winding type roll filter unit to which it is attached will be described. As shown in FIG. 1 and FIG. 2, the roll-up roll filter unit 100 in the present embodiment includes the roll filter 1 in a replaceable manner. Furthermore, the winding roll filter unit 100 includes an unwinding shaft 2, a winding shaft 4, and an opening 6.
ロールフィルタ１は濾材３を円筒状に巻付けたもので、巻出し軸２に装填される。そして、ロールフィルタユニット１００は、ロールフィルタ１が、巻取り軸４に装填されている芯棒５で順次巻き取られ、濾材３の未使用部分が開口部６を順次覆うように構成されている。 The roll filter 1 is obtained by winding a filter medium 3 in a cylindrical shape, and is loaded on the unwinding shaft 2. The roll filter unit 100 is configured such that the roll filter 1 is sequentially wound by the core 5 loaded on the winding shaft 4 and unused portions of the filter medium 3 sequentially cover the openings 6. .
開口部６では被処理ガスが濾材３と直角方向に通気されており、この時濾材３で発生する圧力抵抗により、濾材３は開口部５の支え格子７に張り付くことで、被処理ガスは必ず濾材３を通気することになり、粉塵が濾材３で効率的に除去され、清浄ガスが巻取式ロールフィルタユニット１００から排出される。 In the opening 6, the gas to be treated is vented in a direction perpendicular to the filter medium 3. At this time, the filter medium 3 sticks to the support lattice 7 of the opening 5 due to the pressure resistance generated in the filter medium 3. The filter medium 3 is ventilated, dust is efficiently removed by the filter medium 3, and the clean gas is discharged from the take-up roll filter unit 100.
次に濾材３の構成について説明する。濾材３は平均繊維径が１０μｍ以上２５μｍ以下の短繊維不織布で構成される。短繊維の繊維径が１０μｍよりも小さい場合は圧力損失が大きくなってしまい、被処理ガスを供給するために大量の電力が必要となる。また、繊維径が２５μｍよりも大きい場合は繊維表面積が小さくなり、粉塵捕集効率が低下してしまう。 Next, the configuration of the filter medium 3 will be described. The filter medium 3 is composed of a short fiber nonwoven fabric having an average fiber diameter of 10 μm or more and 25 μm or less. When the fiber diameter of the short fiber is smaller than 10 μm, the pressure loss becomes large, and a large amount of electric power is required to supply the gas to be processed. On the other hand, when the fiber diameter is larger than 25 μm, the fiber surface area becomes small, and the dust collection efficiency is lowered.
また、濾材３は見かけ密度が０．０１５ｇ／ｃｃ以上０．０４０ｇ／ｃｃ以下である。見かけ密度が０．０１５ｇ／ｃｃよりも小さい場合は円筒状に圧縮された形状から単板状になった時に厚みが十分に復元されず、粉塵保持量が著しく少なくなってしまう。また、見かけ密度が０．０４０ｇ／ｃｃよりも大きい場合は元々の粉塵保持量が著しく小さくなってしまう。 The filter medium 3 has an apparent density of 0.015 g / cc or more and 0.040 g / cc or less. When the apparent density is less than 0.015 g / cc, the thickness is not sufficiently restored when the shape compressed from the cylindrical shape is changed to a single plate, and the amount of retained dust is remarkably reduced. On the other hand, when the apparent density is larger than 0.040 g / cc, the original dust holding amount is remarkably reduced.
また、濾材３は被処理ガスを線速２．５ｍ／ｓで通気させた時の初期圧力損失が８０Ｐａ以上２００Ｐａ以下である。初期圧力損失が８０Ｐａよりも小さい場合は濾材３が支え格子７に対し十分に張り付くことができず、開口部６と濾材３との間に隙間ができて被処理ガスがショートパスしてしまい、粉塵捕集効率が下がる。また、初期圧力損失が２００Ｐａよりも大きい場合は付着した粉塵量が少量でも圧力損失が著しく上昇してしまい、十分な粉塵保持量が得られない。 The filter medium 3 has an initial pressure loss of 80 Pa or more and 200 Pa or less when the gas to be treated is vented at a linear velocity of 2.5 m / s. When the initial pressure loss is less than 80 Pa, the filter medium 3 cannot sufficiently stick to the support grid 7, a gap is formed between the opening 6 and the filter medium 3, and the gas to be processed has a short path, Dust collection efficiency decreases. In addition, when the initial pressure loss is larger than 200 Pa, even if the amount of attached dust is small, the pressure loss increases remarkably, and a sufficient dust holding amount cannot be obtained.
また、濾材３は線速２．５ｍ／ｓで通気させた時の比色法平均効率が５５％以上である。比色法平均効率が５５％よりも低い場合は清浄ガスに多量の粉塵が混入してしまい、粉塵暴露による環境汚染や後段装置の汚染に繋がる。比色法平均効率の測定はＪＩＳＢ９９０８：２００１形式２（比色法）に準じた方法で測定される。 The filter medium 3 has a colorimetric average efficiency of 55% or more when aerated at a linear speed of 2.5 m / s. When the colorimetric average efficiency is lower than 55%, a large amount of dust is mixed in the clean gas, which leads to environmental pollution due to dust exposure and contamination of subsequent devices. The average efficiency of the colorimetric method is measured by a method according to JIS B 9908: 2001 format 2 (colorimetric method).
また、濾材３は目付が８０ｇ／ｍ２以上２００ｇ／ｍ２以下である。目付が８０ｇ／ｍ２よりも小さい場合は濾材３が強度不足または剛性不足となり、巻取り時の濾材３の破断や、支え格子７への濾材３の張り付きが不十分になってしまう。また、目付が２００ｇ／ｍ２よりも大きい場合は円筒状のロールフィルタ１に加工する際に十分な巻付け長さが得られず、ロールフィルタ単位での粉塵保持量が少なくなり、頻繁にロールフィルタ１を交換する必要がある。 The filter medium 3 has a basis weight of 80 g / m 2 or more and 200 g / m 2 or less. When the basis weight is smaller than 80 g / m 2, the filter medium 3 becomes insufficient in strength or rigidity, and the filter medium 3 is broken when wound or the filter medium 3 is stuck to the support lattice 7. Further, when the basis weight is larger than 200 g / m 2 , a sufficient winding length cannot be obtained when the cylindrical roll filter 1 is processed, and the amount of dust held in the roll filter unit is reduced, so that the roll is frequently rolled. The filter 1 needs to be replaced.
また、濾材３は芯鞘型複合接着短繊維と非接着短繊維とからなり、熱接着短繊維の鞘成分が溶融することで、被接着繊維と接着する短繊維不織布からなる。芯鞘型複合熱接着短繊維は、鞘部分が低融点樹脂であって、芯部分が高融点樹脂である芯鞘型の複合繊維とすることで、被接着短繊維とわずかな接着面積で良好に接着することができ、繊維表面積を殆ど低下させない。芯鞘型複合短繊維以外のサイドバイサイド型複合短繊維等の場合は、外表面に存在する高融点樹脂が溶融せず接着に寄与しないため、繊維交点の接着力不足が発生し、短繊維不織布の剛性不足が生じる。繊維同士を芯鞘型複合接着短繊維の鞘成分で溶融接着することで、平均繊維径が２５μｍより小さい場合でも短繊維の反発力が繊維同士で十分作用し、短繊維不織布の剛性やロールフィルタに加工した後に単板状に戻した際の厚み復元性が十分に得られる。 Moreover, the filter medium 3 consists of a core-sheath-type composite bonded short fiber and a non-bonded short fiber, and consists of a short fiber nonwoven fabric that adheres to the adherend fiber by melting the sheath component of the heat-bonded short fiber. The core-sheath type composite heat-bonded short fiber is a core-sheath type composite fiber whose sheath part is a low melting point resin and whose core part is a high melting point resin. The fiber surface area is hardly reduced. In the case of side-by-side type composite short fibers other than the core-sheath type composite short fibers, the high melting point resin existing on the outer surface does not melt and does not contribute to the adhesion. Insufficient rigidity occurs. By melt-bonding the fibers together with the sheath component of the core-sheath type composite bonded short fiber, even if the average fiber diameter is smaller than 25 μm, the repulsive force of the short fibers sufficiently acts between the fibers, and the rigidity of the short fiber nonwoven fabric and the roll filter Thus, sufficient thickness recovery can be obtained when the sheet is processed into a single plate and then returned to a single plate shape.
濾材３を構成する短繊維不織布の芯鞘型複合熱接着短繊維の芯成分樹脂と鞘成分樹脂の融点の差は、８０℃以上であることが好ましい。８０℃以上融点の差がない場合、不織布製造時の熱接着工程において、熱接着短繊維の鞘成分樹脂の融点以上の温度の熱風にて、鞘成分を溶融することにより熱接着させる際に、芯成分樹脂が軟化又は溶融する場合がり、その場合熱風の風圧により得られる短繊維不織布の厚みが極端に減少してしまう。 The difference in melting point between the core component resin and the sheath component resin of the core-sheath composite heat-bonded short fiber of the short fiber nonwoven fabric constituting the filter medium 3 is preferably 80 ° C. or more. When there is no difference between the melting points of 80 ° C. or more, in the heat bonding step at the time of producing the nonwoven fabric, in the heat bonding by melting the sheath component with hot air having a temperature equal to or higher than the melting point of the sheath component resin of the heat bonding short fiber, The core component resin may be softened or melted. In this case, the thickness of the short fiber nonwoven fabric obtained by the wind pressure of hot air is extremely reduced.
濾材３を構成する短繊維は、限界酸素指数（以下ＬＯＩ値と示す）が２０以上である短繊維が８０重量％以上含有されていることが好ましい。８０％重量未満の場合は、燃焼し易い状況になる。 The short fibers constituting the filter medium 3 preferably contain 80% by weight or more of short fibers having a limiting oxygen index (hereinafter referred to as LOI value) of 20 or more. When the weight is less than 80%, it becomes easy to burn.
濾材３を構成する短繊維のうちの芯鞘型複合熱接着短繊維は、ＬＯＩ値が２０以上であることが好ましく、特に限定はしないが鞘成分が低融点ポリエステル、芯成分が高融点ポリエステルからなる芯鞘型複合繊維が好ましい。一般的に知られているポリエチレン（鞘）／ポリプロピレン（芯）、ポリエチレン（鞘）／ポリエステル（芯）で構成される芯鞘型複合熱接着短繊維では、不織布の難燃性が不十分となるためである。 Of the short fibers constituting the filter medium 3, the core-sheath type composite heat-bonded short fibers preferably have an LOI value of 20 or more, although not particularly limited, the sheath component is a low-melting polyester and the core component is a high-melting polyester. The core-sheath type composite fiber is preferable. In general, the core-sheath type composite heat-bonded short fiber composed of polyethylene (sheath) / polypropylene (core) or polyethylene (sheath) / polyester (core) has insufficient flame retardancy of the nonwoven fabric. Because.
濾材３を構成する短繊維のうちの被接着短繊維も、ＬＯＩ値が２０以上であることが好ましく、ポリエステル繊維、ナイロン繊維、アラミド繊維、ポリフェニレンサルファイド繊維等の繊維が挙げられる。特に限定はされないが、被接着短繊維は、芯鞘型複合熱接着短繊維に鞘成分が低融点ポリエステル、芯成分が高融点ポリエステルからなる繊維を使用した場合、繊維交点の接着性、リサイクル性の面より高融点ポリエステル繊維を使用することが好ましい。 The short fibers to be bonded among the short fibers constituting the filter medium 3 also preferably have a LOI value of 20 or more, and examples thereof include polyester fibers, nylon fibers, aramid fibers, and polyphenylene sulfide fibers. Although there is no particular limitation, when the short fiber to be bonded is a core-sheath type composite heat-bonding short fiber using a fiber whose sheath component is a low-melting polyester and whose core component is a high-melting polyester, the adhesive property at the fiber intersection and the recyclability It is preferable to use a high-melting-point polyester fiber from the above surface.
濾材３の芯鞘型複合熱接着短繊維と被接着短繊維の混繊比率は、６０：４０〜９０：１０であることが好ましい。熱接着短繊維の混繊比率が１０％未満の場合は、不織布製造時の熱接着工程において、ウェブの嵩高性を維持することが困難となる。熱接着短繊維の混繊比率が６０％を越える場合は、接着交点が減少することによって、不織布の剛性不足が生じる。 The mixing ratio of the core-sheath type composite heat-bonding short fiber and the bonded short fiber of the filter medium 3 is preferably 60:40 to 90:10. When the blending ratio of the heat-bonding short fibers is less than 10%, it is difficult to maintain the bulkiness of the web in the heat-bonding process when manufacturing the nonwoven fabric. When the mixing ratio of the heat-bonded short fibers exceeds 60%, the non-woven fabric lacks rigidity due to a decrease in the bonding intersection.
巻取式ロールフィルタユニット１００は、例えば、塗装ブースの排気ガスに含まれている塗料ミストを捕集する用途に適している。塗料ミストはロールフィルタ１に付着した状態で長時間放置するとロールフィルタ１が巻取式ロールフィルタユニット１００と固着してしまい、フィルタの交換が困難になる。巻取式ロールフィルタユニット１００は塗装ミストが固着する前に濾材の巻取りが行われるため、使用後のロールフィルタ１の交換が容易になる。 The roll-up roll filter unit 100 is suitable, for example, for collecting paint mist contained in the exhaust gas of a painting booth. If the paint mist adheres to the roll filter 1 and is left for a long time, the roll filter 1 adheres to the take-up roll filter unit 100, making it difficult to replace the filter. Since the winding type roll filter unit 100 winds up the filter medium before the coating mist adheres, the roll filter 1 after use can be easily replaced.
巻取式ロールフィルタユニット１００は、自動でロールフィルタ１を巻き取るものとするが、手動であってもよい。 The roll-up roll filter unit 100 automatically winds the roll filter 1, but may be manually operated.
以下本発明を実施例によって更に詳細に説明するが、下記実施例は本発明を限定する性質のものではなく、前・後記の趣旨に沿って設計変更することはいずれも本発明の技術的範囲に含まれるものである。実施例、比較例中の性能特性は以下に示す方法にて評価をおこなった。 Hereinafter, the present invention will be described in more detail with reference to examples. However, the following examples are not intended to limit the present invention, and any design changes in accordance with the gist of the preceding and following descriptions are all within the technical scope of the present invention. Is included. The performance characteristics in the examples and comparative examples were evaluated by the following methods.
（見かけ密度）
ロールフィルタ１に加工する前の濾材３を１５０ｍｍ×１５０ｍｍサイズにて不織布重量を測定し、目付（１ｍ２当たりの重量）を算出した。次に該試料の中心部分３箇所の厚みを荷重１．５g／ｃｍ２、測定圧子直径５０ｍｍにて測定し、その平均を厚みとした。見掛け密度は目付を厚みで割り、単位容積あたりの重量を算出した。
(Apparent density)
The weight of the nonwoven fabric was measured with a size of 150 mm × 150 mm before the filter medium 3 was processed into the roll filter 1, and the basis weight (weight per 1 m 2 ) was calculated. Next, the thickness of three central portions of the sample was measured with a load of 1.5 g / cm 2 and a measurement indenter diameter of 50 mm, and the average was taken as the thickness. The apparent density was calculated by dividing the basis weight by the thickness and calculating the weight per unit volume.
（厚み復元性）
ロールフィルタに加工する前の濾材３の平均厚み（厚みＡ）と、ロールフィルタに加工後に広げて単板状とした時の濾材３の平均厚み（厚みＢ）を見かけ密度の測定と同様の方法で測定し、次式により復元率（％）を求めた。厚みＢは、詳細には、濾材をロールフィルタに加工した後１日以上静止させ、その後、濾材を巻き出して広げて５分以内に厚みＢを測定した。
復元率（％）＝厚みＢ／厚みＡ×１００
(Thickness recovery)
The average thickness (thickness A) of the filter medium 3 before processing into a roll filter and the average thickness (thickness B) of the filter medium 3 when processed into a single plate after being processed into a roll filter are the same method as the apparent density measurement. The restoration rate (%) was obtained by the following formula. Specifically, the thickness B was measured after the filter medium was processed into a roll filter for 1 day or more, and then unrolled and spread to measure the thickness B within 5 minutes.
Restoration rate (%) = thickness B / thickness A × 100
（平均細孔径）
濾材３の平均繊維径の算出は、濾材表面及び断面を走査型電子顕微鏡にてランダムに写真撮影した画像の繊維径をノギスにて１／１００ｍｍ単位まで実測し、撮影した画像の倍率で除算して繊維径を算出し、算出して得られたｎ＝１００の平均値を平均繊維径とした。
(Average pore diameter)
The average fiber diameter of the filter medium 3 is calculated by measuring the fiber diameter of an image obtained by randomly photographing the filter medium surface and cross-section with a scanning electron microscope to 1/100 mm units using a caliper, and dividing by the magnification of the photographed image. The fiber diameter was calculated, and the average value of n = 100 obtained by calculation was taken as the average fiber diameter.
（塗料ミスト捕集特性）
幅１４４０ｍｍ、巻付け長さ３０ｍの濾材３を巻きつけたロールフィルタ１を巻取式ロールフィルタユニット１００に装填し、幅１３７０ｍｍ、高さ２５００ｍｍの開口部６へ線速２．５ｍ／ｓ、塗料ミスト濃度２．５ｍｇ／ｍ３の被処理ガスを通気させた。開口部６の濾材の圧力損失が３００Ｐａを維持するように巻取り軸が自動で駆動するように設定し、ロールフィルタ１がすべて使用された時点で終了した。つまり、開口部６の濾材３の圧力損失が３００Ｐａを維持するように、徐々に濾材３の使用済み部分が開口部６から外れ、代わりに新しい濾材３部分が搬送されていくように駆動した。圧力損失は、濾材３を流れる被処理ガスの上流及び下流の静圧を測定し、その差圧から算出した。使用済みのロールフィルタ１で捕集された塗料ミスト重量から平均捕集効率および塗料ミスト保持量を算出した。
(Paint mist collection characteristics)
The roll filter 1 wound with the filter medium 3 having a width of 1440 mm and a winding length of 30 m is loaded into the take-up roll filter unit 100, and the linear velocity is 2.5 m / s to the opening 6 having a width of 1370 mm and a height of 2500 mm. A gas to be treated having a mist concentration of 2.5 mg / m 3 was aerated. The winding shaft was set to automatically drive so that the pressure loss of the filter medium in the opening 6 was maintained at 300 Pa, and the process was completed when all the roll filters 1 were used. That is, it was driven so that the used part of the filter medium 3 was gradually removed from the opening 6 and a new filter medium 3 part was conveyed instead so that the pressure loss of the filter medium 3 in the opening 6 was maintained at 300 Pa. The pressure loss was calculated from the differential pressure obtained by measuring the static pressure upstream and downstream of the gas to be treated flowing through the filter medium 3. The average collection efficiency and paint mist retention amount were calculated from the paint mist weight collected by the used roll filter 1.
＜実施例１＞
実施例１の濾材３を構成する芯鞘型複合熱接着短繊維として、平均繊維径が１７μｍ、芯成分に融点が２５５℃のポリエステル樹脂、鞘成分に融点１１０℃のポリエステル樹脂を用いた。非接着短繊維として平均繊維径が１７μｍ、融点が２５５℃のポリエステル樹脂を用い、芯鞘型複合熱接着短繊維と非接着短繊維との混繊維比率が８０：２０となるように混合した後、ウェブ状に加工して熱処理し、熱接着短繊維を溶融し、短繊維不織布とした後、直径３３０ｍｍの円筒状に加工してロールフィルタを製作した。製作した濾材の目付は１２０ｇ／ｍ２、見かけ密度は０．０２０ｇ／ｃｃであった。
<Example 1>
As the core-sheath type composite heat-bonding short fibers constituting the filter medium 3 of Example 1, a polyester resin having an average fiber diameter of 17 μm, a core component having a melting point of 255 ° C., and a sheath component having a melting point of 110 ° C. was used. After mixing the non-adhesive short fibers using a polyester resin having an average fiber diameter of 17 μm and a melting point of 255 ° C. so that the mixed fiber ratio of the core-sheath composite heat-bonded short fibers and the non-adhesive short fibers is 80:20 Then, it was processed into a web shape and heat-treated, the heat-bonded short fibers were melted to form a short fiber nonwoven fabric, and then processed into a cylindrical shape having a diameter of 330 mm to produce a roll filter. The produced filter medium had a basis weight of 120 g / m 2 and an apparent density of 0.020 g / cc.
＜比較例１＞
比較例１の濾材３の構成として、平均繊維径が１７μｍ、融点が２５５℃のポリエステル樹脂からなる非接着短繊維を用い、ウェブ状に加工してエステルウレタン系樹脂を分散させた分散液に浸漬させて非接着短繊維同士を結合させ、短繊維不織布とした後、直径３３０ｍｍの円筒状に加工してロールフィルタを製作した。製作した濾材の目付は１４０ｇ／ｍ２、見かけ密度は０．０３５ｇ／ｃｃであった。
<Comparative Example 1>
As a constitution of the filter medium 3 of Comparative Example 1, non-adhesive short fibers made of a polyester resin having an average fiber diameter of 17 μm and a melting point of 255 ° C. were used, and immersed in a dispersion in which an ester urethane resin was dispersed into a web shape. The non-adhesive short fibers were bonded together to form a short fiber nonwoven fabric, and then processed into a cylindrical shape having a diameter of 330 mm to produce a roll filter. The produced filter medium had a basis weight of 140 g / m 2 and an apparent density of 0.035 g / cc.
＜比較例２＞
比較例２の濾材３の構成として、平均繊維径が１７μｍ、融点が２５５℃のポリエステル樹脂からなる非接着短繊維を用い、ウェブ状に加工した後、ニードルパンチ法にて短繊維を交絡させ、短繊維不織布とした後、直径３３０ｍｍの円筒状に加工してロールフィルタを製作した。製作した濾材の目付は１３０ｇ／ｍ２、見かけ密度は０．０２５ｇ／ｃｃであった。
<Comparative Example 2>
As a configuration of the filter medium 3 of Comparative Example 2, after using non-adhesive short fibers made of a polyester resin having an average fiber diameter of 17 μm and a melting point of 255 ° C., the short fibers were entangled by a needle punch method, After forming a short fiber nonwoven fabric, it was processed into a cylindrical shape having a diameter of 330 mm to produce a roll filter. The manufactured filter medium had a basis weight of 130 g / m 2 and an apparent density of 0.025 g / cc.
実施例１は、塗料ミストに対する平均捕集効率および塗料ミスト保持量が比較例１、比較例２よりも高く、厚み復元率が比較例２よりも高いことから、ロールフィルタ１及び巻取式ロールフィルタユニット１００として良好であることがわかる。 In Example 1, since the average collection efficiency for paint mist and the amount of paint mist retained are higher than those of Comparative Example 1 and Comparative Example 2, and the thickness restoration rate is higher than that of Comparative Example 2, roll filter 1 and take-up roll It can be seen that the filter unit 100 is good.
なお、上記開示した各実施の形態および各実施例はすべて例示であり制限的なものではない。また、各実施の形態および各実施例で開示した構成を適宜組み合わせた実施の形態や実施例も本発明に含まれる。つまり、本発明の技術的範囲は、特許請求の範囲によって有効であり、特許請求の範囲の記載と均等の意味および範囲内のすべての変更・修正・置き換え等を含むものである。 It should be noted that each of the disclosed embodiments and examples is illustrative only and not restrictive. In addition, embodiments and examples in which the configurations disclosed in the respective embodiments and examples are appropriately combined are also included in the present invention. In other words, the technical scope of the present invention is effective according to the scope of the claims, and includes all changes, modifications, replacements, etc. within the meaning and scope equivalent to the description of the scope of claims.
本発明は、例えば向上やビルから排出される粉塵を含む被処理ガスから粉塵を捕集するシステムに有効に利用することができる。 INDUSTRIAL APPLICABILITY The present invention can be effectively used for, for example, a system for collecting dust from a gas to be treated including improvement and dust discharged from a building.
１ ロールフィルタ
２ 巻出し軸
３ 濾材
４ 巻取り軸
５ 芯棒
６ 開口部
７ 支え格子
１００ 巻取式ロールフィルタユニット
DESCRIPTION OF SYMBOLS 1 Roll filter 2 Unwinding shaft 3 Filter material 4 Winding shaft 5 Core rod 6 Opening part 7 Supporting grid 100 Winding-type roll filter unit
Claims (5)
芯鞘型複合熱接着短繊維と非接着短繊維とから構成され、
目付が８０ｇ／ｍ２以上２００ｇ／ｍ２以下、
見かけ密度が０．０１５ｇ／ｃｃ以上０．０４０ｇ／ｃｃ以下、
平均繊維径が１０μｍ以上２５μｍ以下、
線速２．５ｍ／ｓで通気させた時の、初期圧力損失が８０Ｐａ以上２００Ｐａ以下であり、かつ、比色法平均効率が５５％以上であることを特徴とする短繊維不織布。 It is a short fiber nonwoven fabric for roll filters that collects dust contained in the gas to be treated,
Consists of core-sheath type composite heat-bonded short fibers and non-bonded short fibers
The basis weight is 80 g / m 2 or more and 200 g / m 2 or less,
The apparent density is 0.015 g / cc or more and 0.040 g / cc or less,
The average fiber diameter is 10 μm or more and 25 μm or less,
A short fiber nonwoven fabric having an initial pressure loss of 80 Pa or more and 200 Pa or less and a colorimetric average efficiency of 55% or more when aerated at a linear velocity of 2.5 m / s.
復元率（％）＝（Ｂ／Ａ）×１００ The restoration rate (%) obtained by the following formula (1) from the average thickness (A) before processing into a roll filter and the average thickness (B) when expanded after processing into a roll filter is 90% or more. The short fiber nonwoven fabric according to claim 1.
Restoration rate (%) = (B / A) × 100
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09314027A (en) * | 1996-05-31 | 1997-12-09 | Ricoh Co Ltd | Coating device |
| JPH10216433A (en) * | 1997-02-12 | 1998-08-18 | Toyobo Co Ltd | Nonwoven fabric for take-up type air filter |
| JP2005013890A (en) * | 2003-06-26 | 2005-01-20 | Ohtsuka Brush Manufacturing Co Ltd | Cleaning apparatus for coating exhaust gas |
| JP2010110744A (en) * | 2008-11-04 | 2010-05-20 | Nippon Air Filter Kk | Automatic rolling-up air filter |
| KR20110120580A (en) * | 2010-04-29 | 2011-11-04 | 훼이스건설 주식회사 | Apparatus for roll filter |
| JP2011256491A (en) * | 2010-06-10 | 2011-12-22 | Toyobo Co Ltd | Filter |
| JP2012170914A (en) * | 2011-02-23 | 2012-09-10 | Toyobo Co Ltd | Electret filter medium |
| JP2012242722A (en) * | 2011-05-23 | 2012-12-10 | Toyobo Co Ltd | Filter for polymerization toner |
-
2018
- 2018-01-31 JP JP2018014528A patent/JP2019130472A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09314027A (en) * | 1996-05-31 | 1997-12-09 | Ricoh Co Ltd | Coating device |
| JPH10216433A (en) * | 1997-02-12 | 1998-08-18 | Toyobo Co Ltd | Nonwoven fabric for take-up type air filter |
| JP2005013890A (en) * | 2003-06-26 | 2005-01-20 | Ohtsuka Brush Manufacturing Co Ltd | Cleaning apparatus for coating exhaust gas |
| JP2010110744A (en) * | 2008-11-04 | 2010-05-20 | Nippon Air Filter Kk | Automatic rolling-up air filter |
| KR20110120580A (en) * | 2010-04-29 | 2011-11-04 | 훼이스건설 주식회사 | Apparatus for roll filter |
| JP2011256491A (en) * | 2010-06-10 | 2011-12-22 | Toyobo Co Ltd | Filter |
| JP2012170914A (en) * | 2011-02-23 | 2012-09-10 | Toyobo Co Ltd | Electret filter medium |
| JP2012242722A (en) * | 2011-05-23 | 2012-12-10 | Toyobo Co Ltd | Filter for polymerization toner |
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