JP2004313880A - Ozone filter - Google Patents
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- JP2004313880A JP2004313880A JP2003109212A JP2003109212A JP2004313880A JP 2004313880 A JP2004313880 A JP 2004313880A JP 2003109212 A JP2003109212 A JP 2003109212A JP 2003109212 A JP2003109212 A JP 2003109212A JP 2004313880 A JP2004313880 A JP 2004313880A
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- filter
- ozone
- activated carbon
- metal oxide
- honeycomb
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- 239000002184 metal Substances 0.000 claims abstract description 30
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- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 33
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- Treating Waste Gases (AREA)
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Abstract
Description
【０００１】
【発明の属する技術分野】
本発明は、画像形成装置内で生ずるオゾンを除去するために設置するオゾンフィルターに関するものである。
【０００２】
【従来の技術】
コロナ放電による帯電方式を採用した電子写真複写機、レーザービームプリンターなどの画像形成装置では、コロナ放電が機内の空気中で行われるために、機内に多量のオゾンが発生することになる。そして、このオゾンは、非常に臭いの強く、酸化性の高い気体であり、空気中に０．１ｐｐｍの濃度が存在するだけで、息切れやめまい、吐き気、頭痛などの生理作用を生じさせるものであるため、事務用機器としてはこのようなオゾンを機外に漏洩させることは大きな欠陥とされている。
【０００３】
かかる問題を克服するため、当該画像形成装置の排気経路にオゾンフィルターを取り付けることが従来から行われており、排気を効率的に行うという観点から当該フィルターは通気抵抗の小さいハニカム構造体が採用されている。
【０００４】
オゾンフィルターのオゾン分解剤は、例えば、特許文献１には、特定の細孔径を有する繊維状活性炭をハニカム状に加工したフィルターが提案されている。しかし、オゾン分解剤として活性炭のみを使用した場合、オゾンの除去は吸着の他、活性炭によるオゾンの還元分解によっても進行するため、オゾンの除去とともに活性炭の劣化が進行することは避けがたく、結果的にフィルター寿命が短くなるという問題を生じていた。
【０００５】
オゾンフィルターの長寿命化のため、近年、金属酸化物を使用したオゾンフィルターが採用されている。例えば、特許文献２には、マンガン等の金属酸化物に活性炭を添加したオゾンフィルター、特許文献３には、一体型のハニカム担体に無定形二酸化マンガンおよびゼオライトを担持したオゾンフィルターが提案されている。しかし、金属酸化物担持フィルターを複写機等に長時間使用すると、オゾン分解性能には問題がなくても、異臭を発する場合があった。
【０００６】
【特許文献１】
特公昭６３−３１２５３号公報
【特許文献２】
特開平３−２１３１４５号公報
【特許文献３】
特開平４−７０３８号公報
【０００７】
【発明が解決しようとする課題】
本発明は上記問題を解決するために、まず、異臭発生のメカニズムを解明するために、種々の分析およびモデルテストを繰り返した。まず、金属酸化物担持フィルターを外気も進入してくる一般的に試験室で、オゾンを３００時間連続又は間欠負荷を行っても異臭の発生が無いことから、オゾンフィルター自身がオゾンに依って酸化分解されて、異臭を発生する現象は起きていないことが分かった。
【０００８】
次に、４５枚／分のモノクロ複写機を使用して、トナー定着後の排気経路にオゾンフィルターを設置した。設置部はオゾンを含まない排気部とオゾンを含む排気部の２カ所に各々金属酸化物担持フィルターを設置し、５万枚の負荷を行った。オゾン負荷時間は約１８時間に相当する。オゾン負荷を行った金属酸化物担持フィルターの官能評価した結果、オゾンを含まない排気部に設置したフィルターからは異臭の発生が無かった。しかし、オゾンを含む排気部に設置したフィルターからは、残存オゾン以外の不快な臭気が認められた。
【０００９】
発明者は、金属酸化物担持フィルターを設置したコピー機（画像形成装置）の機構を詳細に解析し、異臭発生のメカニズムが以下の通りであることを確認した。ペーパーにトナーを定着する際に、１２０〜３００℃（１６０〜２００℃の場合が多い）の高温で処理される。この加熱処理により、トナー及びペーパーの揮発性成分が発生し、金属酸化物担持フィルターに吸着または付着される。この吸着、付着物質がオゾンと金属酸化物に依って、酸化分解され、低級脂肪酸、炭化水素等が生成する。この低級脂肪酸、炭化水素等の甘酸っぱい臭気が異臭となり、金属酸化物担持フィルターから発生することが分かった。
【００１０】
トナーの揮発性成分はトルエン、キシレン、スチレン等の芳香族炭化水素が多く含まれる。一方、ペーパーはＣ１２〜２０ぐらいの脂肪族炭化水素が多く含まれることが分かった。この両者と甘酸っぱい臭気を効率良く除去することで、金属酸化物担持フィルターからの異臭発生の低減できる可能性がある。本発明は圧力損失が小さく、オゾン分解性能に優れ、更に、複写機等で長時間使用しても異臭の発生がしないオゾンフィルターを提供することにある。
【００１１】
【課題を解決するための手段】
即ち、本発明は、画像形成装置内で生ずるオゾンを除去するために、排気経路に装着するオゾンフィルターにおいて、上流側にトルエン吸着量が５ｍｇ／ｃｃ以上の活性炭担持フィルターを設置し、下流側に酢酸吸着量が２．５ｍｇ／ｃｃ以上の金属酸化物担持フィルターを設置したオゾンフィルターを提供するものである。
【００１２】
前記活性炭担持フィルターと金属酸化物担持フィルターは、ハニカム形状であることにより、圧力損失が小さく、オゾン分解性能に優れ、複写機等で長時間使用しても異臭の発生を低減することが可能となった。更に、使用開始直後から若干発生している甘酸っぱい臭気以外の臭気に関しても、低減することが可能となる。
【００１３】
【発明の実施の形態】
本発明は画像形成装置内で生ずるオゾンを除去するために、排気口に装着するオゾンフィルターにおいて、上流側にトルエン吸着容量が５ｍｇ／ｃｃ以上の活性炭担持フィルターを設置し、下流側に酢酸吸着容量が２．５ｍｇ／ｃｃ以上の金属酸化物担持フィルターを設置したことにより、圧力損失が小さく、オゾン分解性能に優れ、複写機等で長時間使用しても異臭の発生を低減することが可能となった。以下、本発明の作用について説明する。
【００１４】
本発明に用いられる活性炭担持フィルターとしては、増粒炭をウレタンまたは不織布等の基材に担持したフィルター、微粒子状活性炭を湿式または乾式の処方で不織布等の基材に担持したシートをプリーツ加工したフィルター、粉末状活性炭を湿式または乾式の処方で不織布等の基材に担持したシートをハニカム加工したフィルター、粉末状活性炭を湿式または乾式の処方で、アルミ箔からなるハニカム基材に担持したフィルター等が使用できる。通常、画像形成装置は低圧力損失の要望が強く、ハニカム型フィルターが最適である。
【００１５】
ハニカム形状にする方法は従来公知の加工方法を採用することができる。本発明においてハニカム形状とは、断面が六画形状のものの他、四角、正弦波形、ロール形のもの等、中空多角柱、中空円柱等の中空柱体が連続して形成された形態のものを意味する。例えば、正弦波形のハニカム形状とするには、まず活性炭担持シートを賦形ロールに通して波形に賦形し、波形の当該活性炭担持シートの片面または両面に平らなシートを接合する。これを積層化して正弦波形のハニカム型フィルターとする。
【００１６】
上記のような正弦波形のハニカム型フィルターを形成する場合には、波形の頂点に接着剤を付けて平らなシートと接合するのが普通であるが、波形の活性炭担持シートを積層するとその間にある平らなシートは必然的に固定されるので、必ずしも接着剤を付ける必要はない。なお、接着剤を付ける場合は活性炭担持シートの吸着能を損なわないものを使用する必要がある。接着剤としては例えば、アクリル系、塩ビ系、酢ビ系、ゴム系、エポキシ系の有機バインダー、又は水ガラス、アルミナゾル、シリカゾル等の無機バインダー使用できる。
【００１７】
上記のハニカム型活性炭担持フィルターの空隙率は、５０〜８５％であることが好ましい。この空隙率が５０％未満では通過する流体の圧力損失が大きくなり、８５％を越えると強度面で耐久性が落ちる場合がある。尚、空隙率は、図１に示したピッチ幅や山高さ等を調整することによって制御することができる。
【００１８】
本発明に用いられる活性炭の種類は、特に限定はなく、例えば木材（木炭）やのこ屑、果実殻（ヤシ殻、棉実殻、もみ殻、コーヒー豆など）、セルロース、リグニン、パルプなどの植物系原料；褐炭、亜炭、泥炭、無煙炭、石油スラッジなどの鉱物系原料等を素材とし、塩化亜鉛などを使用した薬品賦活あるいは水蒸気などを用いたガス賦活等を施すことにより得られた活性炭が挙げられる。
【００１９】
活性炭の形状は、粉末状、粒状、繊維状のいずれであってもよいが、ハニカム型フィルターに使用する場合は、高充填量化を行う必要があり、粉末状や粒状のものが好ましく、粉末状のものがより好ましい。
【００２０】
この際、粉末状あるいは粒状の活性炭の粉粒径としては、１〜１５０μｍが好ましく、より好ましくは１〜１００μｍである。また、シート基材上に担持する活性炭としては特に１〜３０μｍの範囲がよい。粒径が１μｍ未満の活性炭では、飛散や凝着など取り扱い性が悪く、他方１５０μｍより大きい活性炭では、活性炭担持シートの薄層化、高充填量化が困難であり、また当該シートからの活性炭の剥離を招く恐れがある。
【００２１】
本発明に用いられる活性炭の比表面積は、８００ｍ２／ｇ以上が好ましく、１，０００ｍ２／ｇ以上がより好ましい。活性炭の比表面積が８００ｍ２／ｇより小さいと、担持量を多くする必要があり、ハニカムの空隙率が大幅に低下し、圧力損失が大きくなる恐れがあるからである。
【００２２】
本発明において活性炭担持フィルターに含まれる活性炭量は８〜８０ｍｇ／ｃｃが好ましい。より好ましい範囲について述べると、下限値としては、１０ｍｇ／ｃｃ以上であり、さらに好ましくは１５ｍｇ／ｃｃ以上である。他方上限としては、７０ｍｇ／ｃｃ以下であり、さらに好ましくは６０ｍｇ／ｃｃ以下である。８ｍｇ／ｃｃ未満の場合は、十分な吸着性能が得られず、他方８０ｍｇ／ｃｃを越える場合は、ハニカムの空隙率が大幅に低下し、圧力損失が大きくなる恐れがあるからである。
【００２３】
上記の活性炭の種類、粒径、比表面積、担持量を調整することにより、トルエン吸着量を５ｍｇ／ｃｃ以上、より好ましくは８ｍｇ／ｃｃ以上、特に好ましくは１０ｍｇ／ｃｃ以上の特性を発現する活性炭担持フィルターが作製できる。特性上のトルエン吸着量の上限は特にないが、トルエン吸着量が高すぎる場合、活性炭は強度が不足し微粒子化する場合が多く、１５０ｍｇ／ｃｃ以下である事が望ましく、さらに望ましくは１００ｍｇ／ｃｃ以下である。
【００２４】
一方、本発明に用いられる金属酸化物担持フィルターとしては、活性炭担持フィルターと同様にウレタンまたは不織布等の基材に金属酸化物を担持したフィルター、不織布等の基材に金属酸化物を担持したシートをプリーツ加工したフィルター、不織布等の基材に金属酸化物を担持したシートをハニカム加工したフィルター、アルミ箔からなるハニカム基材に金属酸化物を担持したフィルター等が使用できる。活性炭担持フィルターと同様に、圧力損失の特性によって、ハニカム型フィルターが最適である。
【００２５】
上記のハニカム型金属酸化物担持フィルターの空隙率は、５０〜８５％であることが好ましい。この空隙率が５０％未満では通過する流体の圧力損失が大きくなり、８５％を越えると強度面で耐久性が落ちる場合がある。尚、空隙率は、活性炭担持フィルターと同様に図１に示したピッチ幅や山高さ等を調整することによって制御することができる。
【００２６】
本発明に用いられる金属酸化物としては、マンガン、銅、コバルト、ニッケル、鉄、ニッケル、チタン、銀等の単一酸化物、複合酸化物が挙げられる。特に、マンガンの単一酸化物、複合酸化物がより好ましい。
【００２７】
また、上記金属酸化物の形状については、粉末状が好ましく、粉末状の金属酸化物では、その粉粒径としては、１〜１００μｍより好ましくは１〜５０μｍのものを使用するのが良い。即ち、粒径が１μｍ未満のものでは、飛散や凝集等が生じて取り扱い性が悪く、一方粒径が１５０μｍを越えるような大きなものでは、高充填量化が困難となり、また当該フィルターからの剥離を招く恐れがある。
【００２８】
本発明に用いられる金属酸化物の比表面積は、５０ｍ２／ｇ以上、１００ｍ２／ｇ以上であることがより好ましい。金属酸化物の比表面積が５０ｍ２／ｇよりも小さくなると、金属酸化物の触媒活性点が少なくなりオゾンの除去性能が低下する恐れがある。またこれ以上の表面積では効果はほぼ一定となり、大きくする意味がなくなる。
【００２９】
本発明の金属酸化物担持フィルターに含まれる金属酸化物量は２０〜８０ｍｇ／ｃｃであることが好ましい。この量が２０ｍｇ／ｃｃ未満の場合は十分なオゾン除去性能が得られず、一方、８０ｍｇ／ｃｃを越える場合には、ハニカムの空隙率が大幅に低下し、圧力損失が大きくなる恐れがあるからである。
【００３０】
金属酸化物担持フィルターに用いられる活性炭の種類は、特に限定はなく、例えば木材（木炭）やのこ屑、果実殻（ヤシ殻、棉実殻、もみ殻、コーヒー豆など）、セルロース、リグニン、パルプなどの植物系原料；褐炭、亜炭、泥炭、無煙炭、石油スラッジなどの鉱物系原料等を素材とし、塩化亜鉛などを使用した薬品賦活あるいは水蒸気などを用いたガス賦活等を施すことにより得られた活性炭が挙げられる。
【００３１】
特に、甘酸っぱい臭気の成分は酢酸等の低級脂肪酸であり、特に酢酸の除去効率を向上させる必要がある。酢酸吸着量を向上させる方法は、カリウム、ナトリウムのアルカリ金属塩を担持させた活性炭、カリウム、ナトリウム等を多く含む木質系の活性炭がより好ましい。
【００３２】
活性炭の形状は、粉末状、粒状、繊維状のいずれであってもよいが、ハニカム型フィルターに使用する場合は、高充填量化を行う必要があり、粉末状や粒状のものが好ましく、粉末状のものがより好ましい。
【００３３】
この際、粉末状あるいは粒状の活性炭の粉粒径としては、１〜１５０μｍが好ましく、より好ましくは１〜１００μｍである。また、シート基材上に担持する活性炭としては特に１〜３０μｍの範囲がよい。粒径が１μｍ未満の活性炭では、飛散や凝着など取り扱い性が悪く、他方１５０μｍより大きい活性炭では、活性炭担持シートの薄層化、高充填量化が困難であり、また当該シートからの活性炭の剥離を招く恐れがある。
【００３４】
本発明に用いられる活性炭の比表面積は、８００ｍ２／ｇ以上が好ましく、１，０００ｍ２／ｇ以上がより好ましい。活性炭の比表面積が８００ｍ２／ｇより小さいと、担持量を多くする必要があり、ハニカムの空隙率が大幅に低下し、圧力損失が大きくなる恐れがあるからである。
【００３５】
本発明において金属酸化物担持フィルターに含まれる活性炭量は４〜４０ｍｇ／ｃｃが好ましい。より好ましい範囲について述べると、下限値としては、５ｍｇ／ｃｃ以上であり、さらに好ましくは８ｍｇ／ｃｃ以上である。他方上限としては、３５ｍｇ／ｃｃ以下であり、さらに好ましくは３０ｍｇ／ｃｃ以下である。４ｇ／ｃｃ未満の場合は、十分な酢酸吸着性能が得られず、他方８０ｍｇ／ｃｃを越える場合は、ハニカムの空隙率が大幅に低下し、圧力損失が大きくなる恐れがあるからである。
【００３６】
上記の活性炭の種類、粒径、比表面積、担持量を調整することにより、酢酸吸着量を２．５ｍｇ／ｃｃ以上、より好ましくは４ｍｇ／ｃｃ以上の特性を発現する金属酸化物担持フィルターが作製できる。特性上の酢酸吸着量の上限は特にないが、酢酸吸着量が高すぎる場合、活性炭は強度が不足し微粒子化する場合が多く、１２０ｍｇ／ｃｃ以下である事が望ましく、さらに望ましくは８０ｍｇ／ｃｃ以下である。
【００３７】
活性炭担持フィルターと金属酸化物担持フィルターの設置方法は、トナー及びペーパーの揮発性成分を除去する活性炭担持フィルターを上流に設置し、その下流側に金属酸化物担持フィルターを設置することにより、金属酸化物担持フィルターからの異臭発生を低減できる。活性炭担持フィルターを金属酸化物担持フィルターの下流に設置した場合、画像形成装置の使用開始直後からトナー及びペーパーの揮発性成分の負荷が始まり、活性炭担持フィルターを設置しない場合と比較しては、長時間使用できるが、効果が小さい。
【００３８】
活性炭担持フィルターと金属酸化物担持フィルターは、両者が接している状態でも良く、離れていても、効果が変わらない。両者のフィルター端部からのオゾンのリークを防止するために、シール材のウレタンフォームを両面テープで端部を巻く場合があるが、両者が接している場合は、両者を重ね合わせ、ウレタンフォームで一体品にすることも可能である。
【００３９】
トナー定着部からの排気経路において、オゾンを含む排気経路が複数ある場合は、活性炭担持フィルターを各排気経路に設置した方が、金属酸化物担持フィルターにトナー及びペーパーの揮発性成分の負荷が小さくなり、異臭発生を低減できる。
【００４０】
トナー及びペーパーからの揮発性成分が多い画像形成装置においては、活性炭担持フィルターのみを交換する事により、金属酸化物担持フィルターからの異臭の発生を更に長時間抑制できる。
【００４１】
以下、実施例をあげて、本発明をさらに詳しく説明するが、本発明は下記の実施例に何等限定されるものではない。
【００４２】
まず、本実施例で用いたフィルターの試験方法を以下に示す。
【００４３】
（トルエン吸着量）
ＪＩＳＫ１４７４の溶剤蒸気の吸着性能に準拠し、希釈倍率ｎは１０で吸着試験を実施した。吸着量を測定体積で除して、単位体積当たりの吸着量に算出した。
【００４４】
（酢酸吸着量）
内径６３ｍｍのガラス製カラムに金属酸化物担持フィルターをセットし、温度２５℃、相対湿度５０％に調整した１０ｐｐｍの酢酸を含む空気を線速０．５ｍ／ｓでカラムに供給した。フィルター前後の酢酸濃度から除去率（η［−］）を算出する。除去率の算出方法は次式に酢酸入口濃度（Ｃｉ［ｐｐｍ］）、酢酸出口濃度（Ｃｏ［ｐｐｍ］）を代入して算出した。なお、酢酸濃度は炭化水素計で測定した。
【００４５】
η＝１−Ｃｏ／Ｃｉ
【００４６】
この除去率が５％に低下するまで試験を継続し、この試験中に測定したカラム入口及び出口の酢酸濃度から算出した除去率と、カラム入口の酢酸濃度および風量から５分毎の酢酸吸着量を求め、それらを積算してカラムに充填したフィルター容積で除して、吸着容量とした。
【００４７】
（オゾン除去率）
オゾンフィルターを直径６５ｍｍに切断し、内径６５ｍｍのガラス製カラムにセットする。そして、オゾン濃度１ｐｐｍの空気を１ｍ／ｓｅｃで通し、１回の通過でのオゾン除去率を測定した。尚、オゾン濃度は紫外線吸収法オゾン濃度測定器で測定した。そのときの測定条件は、温度２５℃、相対湿度５０％である。
【００４８】
（圧力損失）
オゾンフィルターを直径６５ｍｍに切断し、内径６５ｍｍのガラスカラムにセットする。そして、風速：１ｍ／ｓｅｃの条件で圧力損失を測定した。このとき、圧力損失はマノスターゲージを用いて測定した。
【００４９】
（オゾンフィルターの臭気）
４５枚／分のモノクロ複写機を使用して、トナー定着後の排気経路に縦横それぞれ９０ｍｍのオゾンフィルターを設置した。通紙１万枚毎に排気口の臭気確認及びオゾンフィルターを複写機から取り出し、オゾンフィルター単体の臭気確認を行った。複写機の排気口の臭気確認は、未使用のオゾンフィルターを設置し、両者の比較で行った。一方、オゾンフィルター単体の臭気確認も、未使用のオゾンフィルターと比較を行った。
【００５０】
（実施例１）
水酸化アルミニウム６０部、アラミドパルプ２０部、ポリエステル１０部、バインダーとしてのポリビニルアルコール１０部を混合してスラリー状とし、これをヤンキー型湿式抄紙機で抄紙（目付量２０ｇ／ｍ２、厚さ０．０８ｍｍ）を製造した。得られた抄紙をシート基材として用い、比表面積１２００ｍ２／ｇ、平均粒径１０μｍの木質系粉末状活性炭５０部、水酸化アルミニウム４２部、バインダーとしてのアルギン酸ソーダ８部を混合してペースト状とした後、シート基材の両面にコート加工し、目付量８０ｇ／ｍ２、厚さ０．１７ｍｍの活性炭担持シートを製造した。続いて、得られた活性炭担持シートを、コルゲート加工機を用いてピッチ２．６ｍｍ、山高さ１．２ｍｍの片段ボールシートに成形した。この片段ボールシートを７５段に重ね、縦横それぞれ９０ｍｍの積層体を作り、層長方向を切断加工して層長１０ｍｍ、空隙率６３％のハニカム型活性炭担持フィルターＡを得た。この活性炭担持フィルターＡのトルエン吸着量は８．６ｍｇ／ｃｃであった。
【００５１】
厚み３０μｍ、幅１０ｍｍのテープ状のアルミ箔をピッチ２ｍｍ、山高さ０．８ｍｍに賦形ロールに通して波形に加工した。この波形のアルミ箔と平らなアルミ箔とを交互に積層し、縦横それぞれ９０ｍｍの積層体を作り、治具で固定し、ハニカム基材を製造した。このハニカム基材を水溶性アクリル樹脂中に浸漬し、樹脂より引き上げた後に、余分の樹脂を吹き落とした。そして、１８０℃で１５分間樹脂を乾燥し、ハニカム基材の固着化を行った。このアクリル樹脂で固着されたハニカム基材に、比表面積１５０ｍ２／ｇ、平均粒径１５μｍのマンガン酸化物３５部、比表面積１２００ｍ２／ｇ、平均粒径１０μｍの粉末状活性炭１５部、水酸化アルミニウム４２部、バインダーとしてのアルギン酸ソーダ８部を混合してペースト状とした後、ハニカム基材の全面にコート加工し、コート量１２０ｍｇ／ｃｃ、空隙率７０％のハニカム型金属酸化物担持フィルターＣを得た。この金属酸化物担持フィルターＣの酢酸吸着量は４．８ｍｇ／ｃｃであった。
【００５２】
排気経路の上流側に活性炭担持フィルターＡを、下流側に金属酸化物担持フィルターＣを設置する構成で、両者を接するように積層し、フィルター端部に幅２０ｍｍ、厚み３ｍｍの両面テープ付きウレタンフォームを巻き付け、一体型のハニカム型オゾンフィルターを作製した。
【００５３】
（実施例２）
排気経路の上流側に活性炭担持フィルターＡを、下流側に金属酸化物担持フィルターＣを設置する構成で、各々に幅１０ｍｍ、厚み３ｍｍの両面テープ付きウレタンフォーム巻き付けた。活性炭担持フィルターＡと金属酸化物担持フィルターＣの設置間隔を２０ｍｍとし、分割型のハニカム型オゾンフィルターを作製した。
【００５４】
（比較例１）
排気経路に金属酸化物担持フィルターＣのみを設置する構成で、フィルター端部に幅１０ｍｍ、厚み３ｍｍの両面テープ付きウレタンフォーム巻き付けたハニカム型オゾンフィルターを作製した。
【００５５】
（比較例２）
排気経路の上流側に金属酸化物担持フィルターＣを、下流側に活性炭担持フィルターＡを設置する構成で、両者を接するように積層したオゾンフィルターを作製した。フィルター端部に幅２０ｍｍ、厚み３ｍｍの両面テープ付きウレタンフォーム巻き付け、一体型のハニカム型オゾンフィルターを作製した。
【００５６】
（比較例３）
実施例１のシート基材を用い、比表面積１２００ｍ２／ｇ、平均粒径１０μｍの木質系粉末状活性炭５０部、水酸化アルミニウム４２部、バインダーとしてのアルギン酸ソーダ８部を混合してペースト状とした後、シート基材の両面にコート加工し、目付量５０ｇ／ｍ２、厚さ０．１３ｍｍの活性炭担持シートを製造した。続いて、得られた活性炭担持シートを、コルゲート加工機を用いてピッチ２．６ｍｍ、山高さ１．２ｍｍの片段ボールシートに成形した。この片段ボールシートを７５段に重ね、縦横それぞれ９０ｍｍの積層体を作り、層長方向を切断加工して層長１０ｍｍ、空隙率７１％のハニカム型活性炭担持フィルターＢを得た。この活性炭担持フィルターＢのトルエン吸着量は３．８ｍｇ／ｃｃであった。
【００５７】
排気経路の上流側に活性炭担持フィルターＢを、下流側に金属酸化物担持フィルターＣを設置する構成で、両者を接するように積層し、フィルター端部に幅２０ｍｍ、厚み３ｍｍの両面テープ付きウレタンフォーム巻き付け、一体型のハニカム型オゾンフィルターを作製した。
【００５８】
（比較例４）
実施例１のアクリル樹脂で固着されたハニカム基材に、比表面積１５０ｍ２／ｇ、平均粒径１５μｍのマンガン酸化物４５部、比表面積１２００ｍ２／ｇ、平均粒径１０μｍの粉末状活性炭５部、水酸化アルミニウム４２部、バインダーとしてのアルギン酸ソーダ８部を混合してペースト状とした後、ハニカム基材の全面にコート加工し、コート量１２０ｍｇ／ｃｃ、空隙率７０％のハニカム型金属酸化物担持フィルターＤを得た。この金属酸化物担持フィルターＤの酢酸吸着量は１．６ｍｇ／ｃｃであった。
【００５９】
排気経路の上流側に活性炭担持フィルターＡを、下流側に金属酸化物担持フィルターＤを下流側に接するように積層し、フィルター端部に幅２０ｍｍ、厚み３ｍｍの両面テープ付きウレタンフォーム巻き付け、一体型のハニカム型オゾンフィルターを作製した。
【００６０】
上述したオゾンフィルターについて、先に説明した方法により圧力損失、オゾン除去率、オゾンフィルターの臭気確認の評価を実施した。結果を圧力損失、オゾン除去率を第１表に、オゾンフィルターの臭気確認を第２表に示す。
【００６１】
【表１】
【表２】
【発明の効果】
本発明は以上述べたように画像形成装置内で生ずるオゾンを除去するために、排気経路に装着するオゾンフィルターにおいて、上流側にトルエン吸着量が５ｍｇ／ｃｃ以上の活性炭担持フィルターを設置し、下流側に酢酸吸着量が２．５ｍｇ／ｃｃ以上の金属酸化物担持フィルターを設置したオゾンフィルターを提供するものである。
【図面の簡単な説明】
【図１】ハニカム型オゾンフィルターの断面概要図である。
【図２】ハニカム型オゾンフィルターの断面概要図である。
【符号の説明】
１：ピッチ幅
２：山高さ
３：縦
４：横
５：層長[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an ozone filter provided for removing ozone generated in an image forming apparatus.
[0002]
[Prior art]
2. Description of the Related Art In an image forming apparatus such as an electrophotographic copying machine or a laser beam printer that employs a charging method using corona discharge, a large amount of ozone is generated in the apparatus because corona discharge is performed in the air inside the apparatus. This ozone is a gas with a very strong smell and a high oxidizing property. The presence of only 0.1 ppm in the air causes physiological effects such as shortness of breath, dizziness, nausea, and headache. For this reason, leakage of such ozone out of the office equipment is considered to be a major defect.
[0003]
In order to overcome such a problem, an ozone filter has conventionally been attached to an exhaust path of the image forming apparatus. From the viewpoint of efficiently exhausting, the filter employs a honeycomb structure having a small airflow resistance. ing.
[0004]
As an ozonolysis agent for an ozone filter, for example, Patent Document 1 proposes a filter in which fibrous activated carbon having a specific pore diameter is processed into a honeycomb shape. However, when only activated carbon is used as the ozone decomposer, the removal of ozone proceeds not only by adsorption but also by the reductive decomposition of ozone by activated carbon. There is a problem that the filter life is shortened.
[0005]
In order to extend the life of the ozone filter, an ozone filter using a metal oxide has recently been adopted. For example,
[0006]
[Patent Document 1]
JP-B-63-31253 [Patent Document 2]
JP-A-3-213145 [Patent Document 3]
JP-A-4-7038
[Problems to be solved by the invention]
In order to solve the above-mentioned problems, the present invention has been repeated various analyzes and model tests in order to elucidate the mechanism of off-flavor generation. First, the ozone filter itself is oxidized by the ozone because no smell is generated even if the ozone is continuously or intermittently loaded for 300 hours in a test room where the outside air also enters the metal oxide supporting filter. It was found that there was no occurrence of the phenomenon of decomposition and generation of offensive odor.
[0008]
Next, using a monochrome copying machine of 45 sheets / min, an ozone filter was installed in the exhaust path after fixing the toner. In the installation section, metal oxide-carrying filters were installed at two places, an exhaust section not containing ozone and an exhaust section containing ozone, and a load of 50,000 sheets was applied. The ozone loading time corresponds to about 18 hours. As a result of the sensory evaluation of the metal oxide-carrying filter subjected to the ozone load, no off-odor was generated from the filter installed in the exhaust part containing no ozone. However, an unpleasant odor other than residual ozone was recognized from the filter installed in the exhaust part containing ozone.
[0009]
The inventor analyzed in detail the mechanism of a copying machine (image forming apparatus) provided with a metal oxide supporting filter, and confirmed that the mechanism of generation of an unusual odor is as follows. When fixing the toner on the paper, the paper is processed at a high temperature of 120 to 300 ° C. (often 160 to 200 ° C.). By this heat treatment, volatile components of the toner and the paper are generated and adsorbed or adhered to the metal oxide-carrying filter. The adsorbed and adhered substances are oxidatively decomposed by ozone and metal oxides, thereby producing lower fatty acids, hydrocarbons and the like. It was found that the sweet and sour odor of the lower fatty acids, hydrocarbons and the like became off-flavor and was generated from the metal oxide-carrying filter.
[0010]
The volatile components of the toner are rich in aromatic hydrocarbons such as toluene, xylene and styrene. On the other hand, the paper was found to contain a large amount of C12-20 aliphatic hydrocarbons. Efficient removal of both of these and sweet and sour odors can reduce the generation of off-flavors from the metal oxide-carrying filter. An object of the present invention is to provide an ozone filter which has a small pressure loss, is excellent in ozone decomposing performance, and does not generate an odor even when used for a long time in a copying machine or the like.
[0011]
[Means for Solving the Problems]
That is, according to the present invention, in order to remove ozone generated in the image forming apparatus, an ozone filter attached to an exhaust path is provided with an activated carbon carrying filter having a toluene adsorption amount of 5 mg / cc or more on an upstream side and a downstream side on an downstream side. An ozone filter provided with a metal oxide supporting filter having an acetic acid adsorption amount of 2.5 mg / cc or more is provided.
[0012]
The activated carbon-carrying filter and the metal oxide-carrying filter have a honeycomb shape, so that the pressure loss is small, the ozone decomposition performance is excellent, and it is possible to reduce the generation of offensive odor even when used for a long time in a copying machine or the like. became. Further, it is possible to reduce odors other than the sweet and sour odor slightly generated immediately after the start of use.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
According to the present invention, in order to remove ozone generated in an image forming apparatus, an ozone filter mounted on an exhaust port is provided with an activated carbon supporting filter having a toluene adsorption capacity of 5 mg / cc or more on an upstream side and an acetic acid adsorption capacity on a downstream side. By installing a metal oxide-carrying filter with a concentration of 2.5 mg / cc or more, it is possible to reduce pressure loss, excel in ozone decomposition performance, and reduce the generation of unpleasant odors even when used for a long time in copying machines. became. Hereinafter, the operation of the present invention will be described.
[0014]
As the activated carbon-supported filter used in the present invention, a filter in which expanded carbon is supported on a base material such as urethane or nonwoven fabric, and a sheet in which particulate activated carbon is supported on a base material such as nonwoven fabric in a wet or dry formulation were pleated. Filters, filters in which a sheet in which powdered activated carbon is supported on a base material such as nonwoven fabric in a wet or dry type is honeycomb-processed, filters in which powdered activated carbon is supported on a honeycomb substrate made of aluminum foil in a wet or dry type, etc. Can be used. Usually, there is a strong demand for low pressure loss in an image forming apparatus, and a honeycomb filter is most suitable.
[0015]
As a method for forming a honeycomb shape, a conventionally known processing method can be adopted. In the present invention, the honeycomb shape refers to a shape in which hollow columns such as a hollow polygonal column and a hollow cylinder are continuously formed, such as a square, a sine waveform, a roll shape, etc. means. For example, to obtain a sinusoidal honeycomb shape, the activated carbon-carrying sheet is first formed into a corrugated shape by passing it through a shaping roll, and a flat sheet is bonded to one or both sides of the corrugated activated carbon-carrying sheet. These are laminated to form a sinusoidal honeycomb filter.
[0016]
When forming a honeycomb filter having a sinusoidal waveform as described above, it is common to attach an adhesive to the top of the waveform and join it to a flat sheet, but when a corrugated activated carbon carrying sheet is laminated, it is in between Since the flat sheet is necessarily fixed, it is not always necessary to apply an adhesive. When an adhesive is applied, it is necessary to use a sheet that does not impair the adsorption ability of the activated carbon supporting sheet. As the adhesive, for example, an acrylic, PVC, vinyl acetate, rubber, or epoxy organic binder, or an inorganic binder such as water glass, alumina sol, or silica sol can be used.
[0017]
The porosity of the above-mentioned honeycomb type activated carbon supporting filter is preferably 50 to 85%. If the porosity is less than 50%, the pressure loss of the passing fluid becomes large, and if it exceeds 85%, the durability may be reduced in terms of strength. In addition, the porosity can be controlled by adjusting the pitch width, the peak height, and the like shown in FIG.
[0018]
The type of activated carbon used in the present invention is not particularly limited, and examples thereof include wood (charcoal), sawdust, fruit shell (coconut shell, cottonseed shell, rice hull, coffee beans, etc.), cellulose, lignin, pulp and the like. Plant-based raw materials: Activated carbon obtained by subjecting mineral-based raw materials such as lignite, lignite, peat, anthracite, and petroleum sludge to chemical activation using zinc chloride or the like or gas activation using steam or the like. No.
[0019]
The shape of the activated carbon may be powdery, granular, or fibrous, but when used for a honeycomb filter, it is necessary to increase the filling amount, and powdery or granular ones are preferable, and powdery ones are preferred. Are more preferred.
[0020]
In this case, the powder particle size of the powdery or granular activated carbon is preferably from 1 to 150 μm, more preferably from 1 to 100 μm. The activated carbon supported on the sheet substrate preferably has a range of 1 to 30 μm. Activated carbon having a particle size of less than 1 μm has poor handling properties such as scattering and adhesion. On the other hand, activated carbon having a particle size of more than 150 μm makes it difficult to reduce the thickness of the activated carbon-supporting sheet and increase the filling amount. May be caused.
[0021]
The specific surface area of the activated carbon used in the present invention is preferably 800 m 2 / g or more, more preferably 1,000 m 2 / g or more. If the specific surface area of the activated carbon is smaller than 800 m 2 / g, it is necessary to increase the supported amount, and the porosity of the honeycomb may be significantly reduced, and the pressure loss may be increased.
[0022]
In the present invention, the amount of activated carbon contained in the activated carbon supporting filter is preferably from 8 to 80 mg / cc. Describing a more preferred range, the lower limit is 10 mg / cc or more, and further preferably 15 mg / cc or more. On the other hand, the upper limit is 70 mg / cc or less, more preferably 60 mg / cc or less. When the amount is less than 8 mg / cc, sufficient adsorption performance cannot be obtained. On the other hand, when the amount exceeds 80 mg / cc, the porosity of the honeycomb significantly decreases, and the pressure loss may increase.
[0023]
By adjusting the type, particle size, specific surface area and loading amount of the activated carbon described above, the activated carbon exhibiting a characteristic of a toluene adsorption of 5 mg / cc or more, more preferably 8 mg / cc or more, particularly preferably 10 mg / cc or more. A supported filter can be made. There is no particular upper limit on the amount of toluene adsorbed in terms of characteristics. However, if the amount of adsorbed toluene is too high, the activated carbon often has insufficient strength and is finely divided, and is preferably 150 mg / cc or less, more preferably 100 mg / cc or less. It is as follows.
[0024]
On the other hand, as the metal oxide-supported filter used in the present invention, a filter in which a metal oxide is supported on a base material such as urethane or a nonwoven fabric, and a sheet in which the metal oxide is supported on a base material such as a nonwoven fabric, like the activated carbon-supported filter Can be used, such as a filter obtained by subjecting a sheet in which a metal oxide is supported on a substrate such as a nonwoven fabric to a honeycomb, a filter in which a metal substrate is supported on a honeycomb substrate made of aluminum foil, and the like. As with the activated carbon-carrying filter, the honeycomb type filter is optimal due to the pressure loss characteristics.
[0025]
The porosity of the above-mentioned honeycomb type metal oxide supporting filter is preferably 50 to 85%. If the porosity is less than 50%, the pressure loss of the passing fluid becomes large, and if it exceeds 85%, the durability may be reduced in terms of strength. The porosity can be controlled by adjusting the pitch width, the peak height, and the like shown in FIG. 1 as in the case of the activated carbon supporting filter.
[0026]
Examples of the metal oxide used in the present invention include single oxides such as manganese, copper, cobalt, nickel, iron, nickel, titanium, and silver, and composite oxides. In particular, a manganese single oxide or composite oxide is more preferable.
[0027]
The metal oxide is preferably in the form of a powder. In the case of the powdered metal oxide, the particle size of the powder is preferably 1 to 100 μm, more preferably 1 to 50 μm. That is, when the particle size is less than 1 μm, scattering or aggregation occurs and the handleability is poor. On the other hand, when the particle size is larger than 150 μm, it is difficult to increase the filling amount, and peeling from the filter is difficult. There is a risk of inviting.
[0028]
The specific surface area of the metal oxide used in the present invention is more preferably 50 m 2 / g or more and 100 m 2 / g or more. When the specific surface area of the metal oxide is less than 50 m 2 / g, the catalytically active sites of the metal oxide may be reduced and the ozone removal performance may be reduced. When the surface area is larger than this, the effect becomes almost constant and there is no point in increasing the effect.
[0029]
The amount of the metal oxide contained in the metal oxide-carrying filter of the present invention is preferably 20 to 80 mg / cc. If the amount is less than 20 mg / cc, sufficient ozone removal performance cannot be obtained. On the other hand, if it exceeds 80 mg / cc, the porosity of the honeycomb may be significantly reduced and the pressure loss may be increased. It is.
[0030]
The type of activated carbon used for the metal oxide-carrying filter is not particularly limited. For example, wood (charcoal), sawdust, fruit shell (coconut shell, cottonseed shell, rice hull, coffee beans, etc.), cellulose, lignin, Vegetable raw materials such as pulp; obtained by subjecting mineral raw materials such as lignite, lignite, peat, anthracite, petroleum sludge and the like to chemical activation using zinc chloride or the like or gas activation using steam or the like. Activated carbon.
[0031]
In particular, the component of the sweet and sour odor is a lower fatty acid such as acetic acid, and it is particularly necessary to improve the acetic acid removal efficiency. As a method for improving the acetic acid adsorption amount, activated carbon supporting alkali metal salts of potassium and sodium, and wood-based activated carbon containing a large amount of potassium, sodium, and the like are more preferable.
[0032]
The shape of the activated carbon may be powdery, granular, or fibrous, but when used for a honeycomb filter, it is necessary to increase the filling amount, and powdery or granular ones are preferable, and powdery ones are preferred. Are more preferred.
[0033]
In this case, the powder particle size of the powdery or granular activated carbon is preferably from 1 to 150 μm, more preferably from 1 to 100 μm. The activated carbon supported on the sheet substrate preferably has a range of 1 to 30 μm. Activated carbon having a particle size of less than 1 μm has poor handling properties such as scattering and adhesion. On the other hand, activated carbon having a particle size of more than 150 μm makes it difficult to reduce the thickness of the activated carbon-supporting sheet and increase the filling amount. May be caused.
[0034]
The specific surface area of the activated carbon used in the present invention is preferably 800 m 2 / g or more, more preferably 1,000 m 2 / g or more. If the specific surface area of the activated carbon is smaller than 800 m 2 / g, it is necessary to increase the supported amount, and the porosity of the honeycomb may be significantly reduced, and the pressure loss may be increased.
[0035]
In the present invention, the amount of activated carbon contained in the metal oxide-carrying filter is preferably 4 to 40 mg / cc. Describing a more preferred range, the lower limit is 5 mg / cc or more, and further preferably 8 mg / cc or more. On the other hand, the upper limit is 35 mg / cc or less, more preferably 30 mg / cc or less. If the amount is less than 4 g / cc, sufficient acetic acid adsorption performance cannot be obtained, while if it exceeds 80 mg / cc, the porosity of the honeycomb may be significantly reduced and the pressure loss may be increased.
[0036]
By adjusting the type, particle size, specific surface area, and amount of the activated carbon, a metal oxide-carrying filter capable of exhibiting the acetic acid adsorption amount of 2.5 mg / cc or more, more preferably 4 mg / cc or more is produced. it can. There is no particular upper limit on the amount of acetic acid adsorbed in terms of characteristics. However, if the amount of acetic acid adsorbed is too high, the activated carbon often has insufficient strength and becomes finer, and is preferably 120 mg / cc or less, more preferably 80 mg / cc or less. It is as follows.
[0037]
The method of installing the activated carbon-carrying filter and the metal oxide-carrying filter is as follows. The activated carbon-carrying filter for removing volatile components of toner and paper is installed upstream, and the metal oxide-carrying filter is installed downstream of the filter. The generation of off-flavors from the object-carrying filter can be reduced. When the activated carbon-carrying filter is installed downstream of the metal oxide-carrying filter, the loading of the volatile components of the toner and paper starts immediately after the start of use of the image forming apparatus, which is longer than when the activated carbon-carrying filter is not installed. It can be used for hours, but the effect is small.
[0038]
The activated carbon-carrying filter and the metal oxide-carrying filter may be in a state where they are in contact with each other, or the effect is not changed even if they are separated. In order to prevent leakage of ozone from both filter ends, urethane foam as a sealing material may be wound around the ends with double-sided tape, but when both are in contact, they are overlapped and urethane foam is applied. It is also possible to make an integrated product.
[0039]
When there are a plurality of exhaust paths including ozone in the exhaust path from the toner fixing unit, the load of the volatile components of the toner and the paper on the metal oxide supporting filter is smaller by installing the activated carbon carrying filter in each exhaust path. Odor generation can be reduced.
[0040]
In an image forming apparatus having a large amount of volatile components from toner and paper, by replacing only the activated carbon-carrying filter, generation of an unpleasant odor from the metal oxide-carrying filter can be suppressed for a longer time.
[0041]
Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to the following examples.
[0042]
First, a test method of the filter used in the present example will be described below.
[0043]
(Toluene adsorption amount)
Based on the solvent vapor adsorption performance of JIS K1474, the adsorption test was performed at a dilution factor n of 10. The amount of adsorption was divided by the measured volume to calculate the amount of adsorption per unit volume.
[0044]
(Acetate adsorption amount)
A filter supporting a metal oxide was set in a glass column having an inner diameter of 63 mm, and air containing 10 ppm of acetic acid adjusted to a temperature of 25 ° C and a relative humidity of 50% was supplied to the column at a linear velocity of 0.5 m / s. The removal rate (η [-]) is calculated from the acetic acid concentrations before and after the filter. The removal rate was calculated by substituting the acetic acid inlet concentration (Ci [ppm]) and the acetic acid outlet concentration (Co [ppm]) into the following equation. The acetic acid concentration was measured with a hydrocarbon meter.
[0045]
η = 1-Co / Ci
[0046]
The test is continued until the removal rate drops to 5%. The removal rate calculated from the acetic acid concentrations at the column inlet and outlet measured during the test, and the acetic acid adsorption amount every 5 minutes from the acetic acid concentration and air flow at the column inlet. Were calculated, integrated, and divided by the volume of the filter filled in the column to obtain the adsorption capacity.
[0047]
(Ozone removal rate)
The ozone filter is cut to a diameter of 65 mm and set in a glass column having an inner diameter of 65 mm. Then, air having an ozone concentration of 1 ppm was passed at 1 m / sec, and the ozone removal rate in one pass was measured. Incidentally, the ozone concentration was measured by an ultraviolet absorption method ozone concentration meter. The measurement conditions at that time are a temperature of 25 ° C. and a relative humidity of 50%.
[0048]
(Pressure loss)
The ozone filter is cut to a diameter of 65 mm and set on a glass column having an inner diameter of 65 mm. Then, the pressure loss was measured under the condition of a wind speed of 1 m / sec. At this time, the pressure loss was measured using a Manostar gauge.
[0049]
(Odor of the ozone filter)
Using a monochrome copying machine of 45 sheets / min, an ozone filter of 90 mm in length and width was installed in the exhaust path after fixing the toner. The odor of the exhaust port and the ozone filter were taken out of the copying machine every 10,000 sheets, and the odor of the ozone filter alone was checked. The odor of the exhaust port of the copying machine was checked by installing an unused ozone filter and comparing the two. On the other hand, the odor of the ozone filter alone was also compared with that of an unused ozone filter.
[0050]
(Example 1)
60 parts of aluminum hydroxide, 20 parts of aramid pulp, 10 parts of polyester, and 10 parts of polyvinyl alcohol as a binder were mixed to form a slurry, which was made into a paper by a Yankee type wet paper machine (basis weight 20 g / m 2 , thickness 0). .08 mm). Using the obtained paper as a sheet base material, 50 parts of woody powdery activated carbon having a specific surface area of 1200 m 2 / g and an average particle diameter of 10 μm, 42 parts of aluminum hydroxide, and 8 parts of sodium alginate as a binder were mixed to form a paste. After that, both sides of the sheet substrate were coated to produce an activated carbon-carrying sheet having a basis weight of 80 g / m 2 and a thickness of 0.17 mm. Subsequently, the obtained activated carbon-carrying sheet was formed into a single corrugated cardboard sheet having a pitch of 2.6 mm and a height of 1.2 mm using a corrugating machine. The single-faced corrugated cardboard sheets were stacked in 75 steps to form a laminate having a length and width of 90 mm, and a layer length direction was cut to obtain a honeycomb type activated carbon carrying filter A having a layer length of 10 mm and a porosity of 63%. The toluene adsorption amount of the activated carbon-carrying filter A was 8.6 mg / cc.
[0051]
A tape-shaped aluminum foil having a thickness of 30 μm and a width of 10 mm was processed into a corrugated shape by passing it through a shaping roll at a pitch of 2 mm and a peak height of 0.8 mm. The corrugated aluminum foil and the flat aluminum foil were alternately laminated to form a laminate having a length and width of 90 mm and fixed with a jig to manufacture a honeycomb substrate. The honeycomb substrate was immersed in a water-soluble acrylic resin, pulled up from the resin, and then the excess resin was blown off. Then, the resin was dried at 180 ° C. for 15 minutes to fix the honeycomb substrate. 35 parts of manganese oxide having a specific surface area of 150 m 2 / g and an average particle size of 15 μm, 15 parts of powdered activated carbon having a specific surface area of 1200 m 2 / g and an average particle size of 10 μm were added to the honeycomb substrate fixed with the acrylic resin. After mixing 42 parts of aluminum and 8 parts of sodium alginate as a binder to form a paste, the entire surface of the honeycomb substrate was coated, and a honeycomb-type metal oxide supporting filter C having a coating amount of 120 mg / cc and a porosity of 70% was used. Got. The acetic acid adsorption amount of the metal oxide supporting filter C was 4.8 mg / cc.
[0052]
A configuration in which an activated carbon-carrying filter A is installed on the upstream side of the exhaust path and a metal oxide-carrying filter C is installed on the downstream side, and they are laminated so as to be in contact with each other. Was wound to produce an integral honeycomb type ozone filter.
[0053]
(Example 2)
Activated carbon-carrying filter A was installed on the upstream side of the exhaust path, and metal oxide-carrying filter C was installed on the downstream side. Urethane foam with a double-sided tape with a width of 10 mm and a thickness of 3 mm was wound around each. The separation interval between the activated carbon-carrying filter A and the metal oxide-carrying filter C was set to 20 mm, and a split honeycomb-type ozone filter was manufactured.
[0054]
(Comparative Example 1)
A honeycomb type ozone filter having a configuration in which only the metal oxide-carrying filter C was provided in the exhaust path and wound around a 10 mm-wide and 3 mm-thick urethane foam with a double-sided tape at the filter end was manufactured.
[0055]
(Comparative Example 2)
An ozone filter having a configuration in which a metal oxide-carrying filter C is provided on the upstream side of the exhaust path and an activated carbon-carrying filter A is provided on the downstream side, and an ozone filter was laminated so that both were in contact with each other. A 20 mm-wide and 3 mm-thick urethane foam with a double-sided tape was wound around the filter end to produce an integral honeycomb-type ozone filter.
[0056]
(Comparative Example 3)
Using the sheet base material of Example 1, 50 parts of woody powdery activated carbon having a specific surface area of 1200 m 2 / g and an average particle size of 10 μm, 42 parts of aluminum hydroxide, and 8 parts of sodium alginate as a binder were mixed to form a paste. After that, both sides of the sheet substrate were coated to produce an activated carbon supporting sheet having a basis weight of 50 g / m 2 and a thickness of 0.13 mm. Subsequently, the obtained activated carbon-carrying sheet was formed into a single corrugated cardboard sheet having a pitch of 2.6 mm and a height of 1.2 mm using a corrugating machine. The single-faced corrugated cardboard sheets were stacked in 75 steps to form a laminate having a length and width of 90 mm, and a layer length direction was cut to obtain a honeycomb type activated carbon supporting filter B having a layer length of 10 mm and a porosity of 71%. The toluene adsorption amount of the activated carbon-carrying filter B was 3.8 mg / cc.
[0057]
A configuration in which an activated carbon-carrying filter B is installed on the upstream side of the exhaust path and a metal oxide-carrying filter C is installed on the downstream side, and the two layers are laminated so as to be in contact with each other. The wound and integrated honeycomb-type ozone filter was manufactured.
[0058]
(Comparative Example 4)
5 parts of powdered activated carbon having a specific surface area of 150 m 2 / g, an average particle diameter of 15 μm, 45 parts of manganese oxide, a specific surface area of 1200 m 2 / g, and an average particle diameter of 10 μm were added to the honeycomb substrate fixed with the acrylic resin of Example 1. , 42 parts of aluminum hydroxide and 8 parts of sodium alginate as a binder were mixed to form a paste, which was then coated on the entire surface of the honeycomb substrate to obtain a honeycomb-type metal oxide having a coating amount of 120 mg / cc and a porosity of 70%. A supported filter D was obtained. The acetic acid adsorption amount of the metal oxide-carrying filter D was 1.6 mg / cc.
[0059]
The activated carbon-carrying filter A is laminated on the upstream side of the exhaust path, and the metal oxide-carrying filter D is laminated on the downstream side so as to be in contact with the downstream side. A 20 mm-wide and 3 mm-thick urethane foam with a double-sided tape is wound around the filter end, and is integrated. Was manufactured.
[0060]
With respect to the above-mentioned ozone filter, evaluation of pressure loss, ozone removal rate, and confirmation of odor of the ozone filter were performed by the methods described above. The results are shown in Table 1 for the pressure loss and the ozone removal rate, and Table 2 shows the odor of the ozone filter.
[0061]
[Table 1]
[Table 2]
【The invention's effect】
As described above, according to the present invention, in order to remove ozone generated in an image forming apparatus, an ozone filter installed in an exhaust path is provided with an activated carbon supporting filter having a toluene adsorption amount of 5 mg / cc or more on an upstream side, and a downstream side. An ozone filter provided with a metal oxide-carrying filter having an acetic acid adsorption amount of 2.5 mg / cc or more on its side.
[Brief description of the drawings]
FIG. 1 is a schematic sectional view of a honeycomb type ozone filter.
FIG. 2 is a schematic sectional view of a honeycomb type ozone filter.
[Explanation of symbols]
1: Pitch width 2: Mountain height 3: Vertical 4: Horizontal 5: Layer length
Claims (5)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003109212A JP2004313880A (en) | 2003-04-14 | 2003-04-14 | Ozone filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003109212A JP2004313880A (en) | 2003-04-14 | 2003-04-14 | Ozone filter |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2009166413A Division JP5168242B2 (en) | 2009-07-15 | 2009-07-15 | Ozone filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2004313880A true JP2004313880A (en) | 2004-11-11 |
Family
ID=33470451
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2003109212A Withdrawn JP2004313880A (en) | 2003-04-14 | 2003-04-14 | Ozone filter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2004313880A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007209895A (en) * | 2006-02-09 | 2007-08-23 | Toyobo Co Ltd | Ozone decomposing sheet and air purification filter |
| JP2008185696A (en) * | 2007-01-29 | 2008-08-14 | Kyocera Mita Corp | Removal member for image forming apparatus, and image forming apparatus |
| JP2009241070A (en) * | 2009-07-15 | 2009-10-22 | Toyobo Co Ltd | Ozone filter |
| JP2010240618A (en) * | 2009-04-09 | 2010-10-28 | Toyobo Co Ltd | Deodorant carrier |
| JP2013130671A (en) * | 2011-12-21 | 2013-07-04 | Ricoh Co Ltd | Image forming device |
-
2003
- 2003-04-14 JP JP2003109212A patent/JP2004313880A/en not_active Withdrawn
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007209895A (en) * | 2006-02-09 | 2007-08-23 | Toyobo Co Ltd | Ozone decomposing sheet and air purification filter |
| JP4692311B2 (en) * | 2006-02-09 | 2011-06-01 | 東洋紡績株式会社 | Ozone decomposition sheet and air purification filter |
| JP2008185696A (en) * | 2007-01-29 | 2008-08-14 | Kyocera Mita Corp | Removal member for image forming apparatus, and image forming apparatus |
| JP2010240618A (en) * | 2009-04-09 | 2010-10-28 | Toyobo Co Ltd | Deodorant carrier |
| JP2009241070A (en) * | 2009-07-15 | 2009-10-22 | Toyobo Co Ltd | Ozone filter |
| JP2013130671A (en) * | 2011-12-21 | 2013-07-04 | Ricoh Co Ltd | Image forming device |
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