JP2002018217A - Filter - Google Patents
FilterInfo
- Publication number
- JP2002018217A JP2002018217A JP2001111563A JP2001111563A JP2002018217A JP 2002018217 A JP2002018217 A JP 2002018217A JP 2001111563 A JP2001111563 A JP 2001111563A JP 2001111563 A JP2001111563 A JP 2001111563A JP 2002018217 A JP2002018217 A JP 2002018217A
- Authority
- JP
- Japan
- Prior art keywords
- filter
- nonwoven fabric
- collection efficiency
- layer
- electret nonwoven
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000004745 nonwoven fabric Substances 0.000 claims abstract description 46
- 239000000463 material Substances 0.000 claims abstract description 29
- 239000000835 fiber Substances 0.000 claims description 33
- 239000002245 particle Substances 0.000 claims description 19
- 238000011144 upstream manufacturing Methods 0.000 claims description 10
- 238000001914 filtration Methods 0.000 claims description 9
- 230000001877 deodorizing effect Effects 0.000 claims description 7
- 239000003365 glass fiber Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- 239000002781 deodorant agent Substances 0.000 claims description 3
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 239000000428 dust Substances 0.000 description 18
- 239000012530 fluid Substances 0.000 description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- 238000002834 transmittance Methods 0.000 description 5
- 239000011521 glass Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 2
- 229910052731 fluorine Inorganic materials 0.000 description 2
- 239000011737 fluorine Substances 0.000 description 2
- 239000012982 microporous membrane Substances 0.000 description 2
- 239000003595 mist Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 102100024522 Bladder cancer-associated protein Human genes 0.000 description 1
- 101150110835 Blcap gene Proteins 0.000 description 1
- 235000013162 Cocos nucifera Nutrition 0.000 description 1
- 244000060011 Cocos nucifera Species 0.000 description 1
- 101100493740 Oryza sativa subsp. japonica BC10 gene Proteins 0.000 description 1
- 101100219325 Phaseolus vulgaris BA13 gene Proteins 0.000 description 1
- 239000004113 Sepiolite Substances 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000004332 deodorization Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000012943 hotmelt Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000004750 melt-blown nonwoven Substances 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229910052624 sepiolite Inorganic materials 0.000 description 1
- 235000019355 sepiolite Nutrition 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Control Or Security For Electrophotography (AREA)
- Filtering Materials (AREA)
- Electrostatic Separation (AREA)
- Nonwoven Fabrics (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、粘性の高い液体や
固体の捕集用として広く使用できるフィルタに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter which can be widely used for collecting highly viscous liquids and solids.
【０００２】[0002]
【従来の技術】気体浄化に用いられるフィルタとして
は、特公平３−１０４６号公報に記載されているよう
な、多数のエレクトレット不織布濾材を積層させたもの
が知られている。しかしながら、このようなフィルタを
たとえば電子写真式プリンタに用いた場合、トナーが定
着熱によって分解し粘性の高い液状粒子となって粗密多
層積層エレクトレット不織布濾材に付着し、エレクトレ
ット不織布濾材の電荷が低減して捕集効率が低下する。
そして、その結果、フィルタから排出される粉塵粒子に
よって部屋が汚染されるといった問題がある。2. Description of the Related Art As a filter used for purifying a gas, there is known a filter in which a large number of electret nonwoven fabric filter materials are laminated as described in Japanese Patent Publication No. 3-1046. However, when such a filter is used in, for example, an electrophotographic printer, the toner is decomposed by the fixing heat to become highly viscous liquid particles and adheres to the dense / multi-layer laminated electret nonwoven fabric filter material, and the charge of the electret nonwoven fabric filter material is reduced. And the collection efficiency decreases.
As a result, there is a problem that the room is contaminated by dust particles discharged from the filter.
【０００３】また、特公平５−７８３６２号公報には、
ガラス繊維を含んだＨＥＰＡ濾材を単体で用いたフィル
タが記載されている。しかしながら、このようなフィル
タをたとえば電子写真式プリンタに用いる場合、プリン
タが主に使用される事務所においてはビル管理法によっ
て排出粉塵量を０．１５ｍｇ／ｍ3以下することが義務
づけられているが、この濃度に必要な総捕集効率９９．
５％以上のガラス繊維濾材では、たとえば目標印刷枚数
５０万頁に対して５〜１０万頁程度で目詰まりしてしま
うというように、極めて目詰まりしやすく寿命が短いと
いった問題がある。そして、ガラス繊維を含んだ濾材に
たとえば捕集効率が１７％、３２％、３８％、４２％、
４２％の５枚の非エレクトレット不織布濾材を流体流入
側からこの順序で重ねて配置することで多少寿命を延ば
すことはできるものの、やはり２５万頁程度で寿命を迎
えてしまうというように、目標値には及ばない。[0003] Japanese Patent Publication No. 5-78362 discloses that
A filter using a HEPA filter medium containing glass fibers alone is described. However, when such a filter is used in, for example, an electrophotographic printer, the office where the printer is mainly used is required by the Building Management Law to reduce the amount of discharged dust to 0.15 mg / m 3 or less. , The total collection efficiency required for this concentration
With a glass fiber filter material of 5% or more, there is a problem that the clogging is extremely easy and the life is short, for example, clogging occurs at about 50 to 100,000 pages with respect to the target printing number of 500,000 pages. Then, for example, a collection efficiency of 17%, 32%, 38%, 42%,
The service life can be extended somewhat by arranging five 42% non-electret nonwoven fabric filter media in this order from the fluid inflow side, but the service life will end at about 250,000 pages. Less than.
【０００４】[0004]
【発明が解決しようとする課題】本発明は、エレクトレ
ット不織布濾材の電荷が低減しても総捕集効率を維持で
きる、寿命の長いフィルタを提供することを目的とす
る。SUMMARY OF THE INVENTION An object of the present invention is to provide a long-life filter which can maintain the total collection efficiency even if the charge of the electret nonwoven fabric filter material is reduced.
【０００５】[0005]
【課題を解決するための手段】本発明は、エレクトレッ
ト不織布濾材を配置してなる、捕集効率が９９％以上で
ある第１の濾層と、第１の濾層の下流側に配置された、
機械的捕集効率が７０〜９９．９９％の範囲内にある第
２の濾層とを備えているフィルタを特徴とするものであ
る。According to the present invention, there is provided a first filter layer in which an electret nonwoven fabric filter material is disposed and having a collection efficiency of 99% or more, and a filter layer disposed downstream of the first filter layer. ,
A filter comprising a second filter layer having a mechanical collection efficiency in the range of 70 to 99.99%.
【０００６】ここで、第１の濾層は、平均繊維径の異な
る、少なくとも２枚のエレクトレット不織布濾材を含む
とともに、上流側に大きな平均繊維径を有するエレクト
レット不織布濾材が配置され、下流側に小さな平均繊維
径を有するエレクトレット不織布濾材が配置されている
こと、そして、エレクトレット不織布濾材を構成する繊
維の平均繊維径が０．５〜５０μｍの範囲内にあること
が好ましい。さらに、エレクトレット不織布濾材が、濾
過風速５．３ｃｍ／秒の条件下において粒子径０．３μ
ｍの粒子に対するＱＦ値が０．１以上のものであること
が好ましい。また、第２の濾層がガラス繊維を含んでい
ること、第２の濾層の下流側に脱臭剤層が配置されてい
ることが好ましい。さらに、総捕集効率が９９．５％以
上であることが好ましい。Here, the first filter layer includes at least two electret nonwoven fabric filter media having different average fiber diameters, an electret nonwoven fabric filter material having a large average fiber diameter is arranged on the upstream side, and a small electret nonwoven fabric filter material is arranged on the downstream side. It is preferable that an electret nonwoven fabric filter material having an average fiber diameter is arranged, and that the average fiber diameter of the fibers constituting the electret nonwoven fabric filter material be in the range of 0.5 to 50 μm. Further, the electret nonwoven fabric filter material has a particle diameter of 0.3 μm under the condition of a filtration wind speed of 5.3 cm / sec.
It is preferable that the QF value for the particles of m is 0.1 or more. Further, it is preferable that the second filter layer contains glass fiber, and that the deodorant layer is disposed downstream of the second filter layer. Further, the total collection efficiency is preferably 99.5% or more.
【０００７】エレクトレット不織布としては、エレクト
レット化メルトブロー不織布や、エレクトレット化した
フィルムを切断し繊維状としたものを集合化した不織布
などを好適に用いることができる。As the electret nonwoven fabric, an electret melt-blown nonwoven fabric, a nonwoven fabric obtained by cutting an electretized film into a fibrous form, and the like are preferably used.
【０００８】そして、上記いずれかに記載のフィルタ
は、脱煙・脱臭に用いられること、電子写真方式による
トナー像の定着器に用いられることが好ましい。さら
に、その定着器を備えた電子写真方式によるプリンタま
たは複写機も好ましく、また、上記いずれかに記載のフ
ィルタを用いる電子写真方式によるトナー像の定着方法
も好ましい態様である。[0008] It is preferable that any one of the above filters is used for deodorizing and deodorizing, and is used for a toner image fixing device of an electrophotographic system. Further, an electrophotographic printer or copier equipped with the fixing device is also preferable, and an electrophotographic toner image fixing method using any of the above filters is also a preferable embodiment.
【０００９】[0009]
【発明の実施の形態】本発明のフィルタは、たとえば図
１に示すように、５枚のエレクトレット不織布濾材２〜
６を層状に配置してなる、捕集効率が９９％以上である
第１の濾層Ａと、流体の流入方向に関して第１の濾層Ａ
の下流側に配置された、機械的捕集効率が７０〜９９．
９９％の範囲内にある第２の濾層Ｂとを備えている。DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, for example, a filter of the present invention comprises five
6 having a trapping efficiency of at least 99%, and a first filter layer A with respect to the inflow direction of the fluid.
, The mechanical collection efficiency is 70-99.
A second filter layer B in the range of 99%.
【００１０】たとえば、本発明のフィルタは、たとえば
事務所等に設置されて比較的塵埃濃度が少ない綺麗な環
境で用いられる電子写真方方式によるプリンタや複写機
等に好適に用いられるが、その場合、電子写真式プリン
タ等の装置から大量の粉塵が排出されるのは健康上好ま
しくなく、ビル管理法に沿った排出粉塵量の基準値０．
１５ｍｇ／ｍ3以下とすることが好ましい。このためフ
ィルタとしては、電子写真式プリンタ等の装置から排出
される気体がこの基準を満足するように設計する必要が
あり、検討の結果、総捕集効率を９９．５％以上にする
ことが好ましいことを見出した。For example, the filter of the present invention is suitably used for an electrophotographic printer or copier which is installed in an office or the like and is used in a beautiful environment having a relatively low dust concentration. It is not preferable from a health point of view that a large amount of dust is discharged from an apparatus such as an electrophotographic printer.
It is preferably 15 mg / m 3 or less. For this reason, it is necessary to design the filter so that the gas discharged from an apparatus such as an electrophotographic printer satisfies this criterion. It has been found favorable.
【００１１】そのため、本発明フィルタは、エレクトレ
ット不織布濾材２〜６を配置して、第１の濾層を、捕集
効率を９９％以上にするとともに、その第１の濾層の下
流側に、機械的捕集効率が７０〜９９．９９％の範囲内
にある濾材７を配置して、第２の濾層を設けている。
なお、本発明において、捕集効率とは、静電気による吸
着濾過や濾材の目による機械的な濾過等を含めた総合的
な捕集効率のことをいい、機械的捕集効率とは、濾材の
目による機械的な濾過による捕集効率のことをいう。ま
た、本発明における機械的捕集効率および捕集効率は、
いずれも濾材に対して風速２．５ｃｍ／秒で空気を通し
た時に粒子径０．３μｍの粒子がどれだけ濾過されるか
を示すものである。Therefore, in the filter of the present invention, the first filter layer is provided with electret nonwoven fabric filter materials 2 to 6 so that the collection efficiency is 99% or more, and the first filter layer is provided downstream of the first filter layer. A second filter layer is provided by disposing a filter medium 7 having a mechanical collection efficiency in the range of 70 to 99.99%.
In the present invention, the collection efficiency refers to the total collection efficiency including adsorption filtration by static electricity and mechanical filtration by the eyes of the filter medium, and the mechanical collection efficiency refers to the filtration efficiency of the filter medium. It refers to collection efficiency by mechanical filtration by eyes. Further, the mechanical collection efficiency and the collection efficiency in the present invention,
Each shows how much particles having a particle diameter of 0.3 μm are filtered when air is passed through the filter medium at a wind speed of 2.5 cm / sec.
【００１２】本発明のフィルタは、まず、エレクトレッ
ト不織布濾材２〜６の電荷のために高い捕集効率を有す
るものとなる。また、捕集効率が９９％以上の高い捕集
効率を有する第１の濾層の下流側に、機械的捕集効率が
７０〜９９．９９％の範囲の第２の濾層を形成すること
で、第１の濾層Ａを構成しているエレクトレット不織布
濾材２〜６の電荷が低減しても下流側に配置された第２
の濾層Ｂの濾材７の目によって粒子を機械的に捕集で
き、フィルタとしての総捕集効率を維持し、寿命を延ば
すことができるものである。First, the filter of the present invention has a high collection efficiency due to the charge of the electret nonwoven fabric filter media 2 to 6. Further, a second filtration layer having a mechanical collection efficiency in the range of 70 to 99.99% is formed downstream of the first filtration layer having a high collection efficiency of 99% or more. Thus, even if the charge of the electret nonwoven fabric filter materials 2 to 6 constituting the first filter layer A is reduced, the second one disposed on the downstream side may be used.
The particles can be collected mechanically by the eyes of the filter medium 7 of the filter layer B, so that the total collection efficiency as a filter can be maintained and the life can be prolonged.
【００１３】また、第１の濾層Ａを構成する不織布濾材
２〜６を構成する繊維は、捕集対象によってその平均繊
維径がある値になるように適宜決定すればよいが、各層
を平均繊維径の異なる不織布で各層を構成し、上流側に
大きな平均繊維径を有するエレクトレット不織布濾材
を、下流側に小さな平均繊維径を有するエレクトレット
不織布濾材を配置することが好ましい。このように構成
することで、第１の濾層そのものを高い捕集性能にも関
わらず長い寿命を有するものとできる。なお、平均繊維
径は不織布表面をＳＥＭ写真撮影して少なくとも１００
本以上の繊維径を測定して算出する。The fibers constituting the nonwoven fabric filters 2 to 6 constituting the first filter layer A may be appropriately determined so that the average fiber diameter becomes a certain value depending on the collection target. It is preferable that each layer is composed of nonwoven fabrics having different fiber diameters, and an electret nonwoven fabric filter medium having a large average fiber diameter is arranged on the upstream side, and an electret nonwoven fabric filter medium having a small average fiber diameter is arranged on the downstream side. With this configuration, the first filter layer itself can have a long life despite high collection performance. The average fiber diameter is at least 100 by taking a SEM photograph of the surface of the nonwoven fabric.
Calculate by measuring the fiber diameter of the fibers.
【００１４】そして、電子写真方式のプリンタや複写機
等の装置から排出される粒子の性状はミストとしては粘
性が低く、また、これに混じって固体状の大小の粒子、
特にワックスが配合されたトナーからは０．１〜２．０
μｍの範囲での広い分布の粒子が発生するため、第１の
濾材Ａを、上記のように平均繊維径の勾配をもたせるよ
うに構成するとともに、各層の平均繊維径が０．５〜５
０μｍの範囲になるようにすると、目詰まりを防止でき
好ましい。The properties of the particles discharged from an apparatus such as an electrophotographic printer or copier have low viscosity as a mist.
Particularly, from 0.1 to 2.0 from the toner containing the wax.
Since particles having a wide distribution in the range of μm are generated, the first filter medium A is configured to have a gradient of the average fiber diameter as described above, and the average fiber diameter of each layer is 0.5 to 5 μm.
When the thickness is in the range of 0 μm, clogging can be prevented, which is preferable.
【００１５】たとえば、ワックスを含むような粘性の高
い粒子を捕集するためのフィルタとしては、濾材下層に
粒子が溜まりにくく目詰まりが起こりにくいように、流
体流入方向の上流側を平均繊維径が３〜２０μｍ程度
に、中流域を２〜７μｍの範囲になるように、さらに下
流側を１．０〜３μｍ程度にと、平均繊維径が比較的大
きな不織布濾材を流体流入方向に関して上流側に、平均
繊維径が比較的小さな不織布濾材を流体流入方向に関し
て下流側に配置するすることが好ましい。また、それぞ
れの層の目付は、繊維密度が２５％以下のもので、上流
側が２０〜１００ｇ／ｍ2、中流域が２０〜８０ｇ／
ｍ2、下流側が１０〜６０ｇ／ｍ2と、繊維密度が比較的
大きな不織布濾材を上流側に、繊維密度が比較的小さな
不織布濾材を下流側に配置することが好ましい。このよ
うにすると、第１の濾層Ａとしての捕集効率を９９．９
９％にしつつも目詰まりを防止でき、結果、フィルタの
寿命を延ばすことができる。そして、この第１の濾層の
下流側に機械的捕集効率がたとえば９５％の濾材を積層
すると、全ダストの９０重量％程度以上の粒子を第１の
濾層Ａで捕集し、残りの１０重量％程度のダスト、およ
び、第１の濾層Ａの電荷が消失して捕集できなかったダ
ストを機械的捕集効率が９５％の濾材の目によって必ず
捕集することができる。For example, as a filter for trapping highly viscous particles containing wax, the average fiber diameter on the upstream side in the fluid inflow direction is set so that particles are less likely to accumulate in the lower layer of the filter medium and clogging is less likely to occur. About 3 to 20 μm, so that the middle flow area is in the range of 2 to 7 μm, and further downstream to about 1.0 to 3 μm, the nonwoven fabric filter medium having a relatively large average fiber diameter is placed on the upstream side with respect to the fluid inflow direction, It is preferable to arrange a nonwoven fabric filter medium having a relatively small average fiber diameter on the downstream side in the fluid inflow direction. Further, the basis weight of each layer is such that the fiber density is 25% or less, the upstream side is 20 to 100 g / m 2 , and the middle area is 20 to 80 g / m 2 .
m 2, and 10 to 60 g / m 2 is downstream, a relatively large nonwoven filter medium fiber density on the upstream side, it is preferable that the fiber density is disposed relatively small nonwoven filter medium to the downstream side. In this way, the collection efficiency of the first filter layer A is 99.9.
Clogging can be prevented while keeping the ratio at 9%, and as a result, the life of the filter can be extended. Then, when a filter medium having a mechanical collection efficiency of, for example, 95% is laminated on the downstream side of the first filter layer, particles of about 90% by weight or more of the total dust are collected by the first filter layer A, and the remaining particles are collected. The dust of about 10% by weight and the dust that could not be collected due to the loss of the charge of the first filter layer A can always be collected by a filter medium having a mechanical collection efficiency of 95%.
【００１６】また、ワックスを含まないような粘性の低
い粒子を捕集するためのフィルタとしては、目詰まりよ
りも、エレクトレット不織布濾材に捕集されたミストが
液膜として広がり易いためエレクトレットの電荷の消失
が激しいため、捕集効率がより重要な要因となってく
る。そのため、エレクトレット不織布濾材各層の平均繊
維径の勾配は小さくても良く、紙紛などの固形物をとる
に適当な繊維径勾配、たとえば、上流側が４μｍ以上、
中流側が２〜４μｍ、下流側が０．５〜２μｍとすれば
よい。また、各層の目付は、繊維密度２５％以下のもの
で上流側が４０〜８０ｇ／ｍ2、中流側が３０〜６０ｇ
／ｍ2、下流側が４０〜１００ｇ／ｍ2程度であることが
捕集効率の長期保持の観点から好ましい。このように構
成することで、第１の濾層としての捕集効率をたとえば
９９．９９９％以上にできる。そして、この場合も、第
１の濾層の下流側に機械的捕集効率がたとえば９９．９
％の濾材を設けることで、電荷消失のため第１の濾層Ａ
で捕集できなかったダストを捕集することができ、フィ
ルタとしての総捕集率をたとえば９９．９５％以上に維
持できる。Further, as a filter for collecting low-viscosity particles that do not contain wax, the mist collected by the electret nonwoven fabric filter material is more likely to spread as a liquid film than clogging, so that the charge of the electret is reduced. Due to the severe loss, collection efficiency is a more important factor. Therefore, the gradient of the average fiber diameter of each layer of the electret nonwoven fabric filter medium may be small, and the fiber diameter gradient suitable for taking solid matter such as paper dust, for example, the upstream side is 4 μm or more,
The midstream side may be 2 to 4 μm, and the downstream side may be 0.5 to 2 μm. The basis weight of each layer is 40% to 80 g / m 2 on the upstream side, and 30 to 60 g on the middle side, with a fiber density of 25% or less.
/ M 2 , and the downstream side is preferably about 40 to 100 g / m 2 from the viewpoint of long-term retention of collection efficiency. With this configuration, the collection efficiency of the first filter layer can be set to, for example, 99.999% or more. And also in this case, the mechanical collection efficiency is, for example, 99.9 downstream of the first filter layer.
% Of the first filtration layer A
Can collect dust that could not be collected, and the total collection rate as a filter can be maintained at, for example, 99.95% or more.
【００１７】ここで、第１の濾層についてであるが、上
記実施態様のように平均繊維径の異なる層が積層されて
いるものに他、明確に層状に分離出できない状態で平均
繊維径の勾配が形成されているものでもよい。Here, regarding the first filter layer, in addition to the above-mentioned embodiment in which layers having different average fiber diameters are laminated, the average filter diameter cannot be clearly separated into layers. A gradient may be formed.
【００１８】さらに、目詰まりを防ぐ目的は、品質係数
ＱＦ値の高いエレクトレット不織布濾材を用いることで
達成できる。ＱＦ値とは、濾材の透過率の自然対数およ
び圧力損失から、次式のように計算されるものである。 ＱＦ[１／Ｐａ]＝−ｌｎ（透過率[％]）／圧力損失[Ｐ
ａ] ここで、透過率は、濾材に対して風速５．３ｃｍ／秒で
空気を通したときに粒子径０．３μｍの粒子がどれだけ
透過するかを示すものであり、圧力損失は、濾材に対し
て風速５．３ｃｍ／秒で空気を通したときの値である。Further, the purpose of preventing clogging can be achieved by using an electret nonwoven fabric filter medium having a high quality factor QF value. The QF value is calculated from the natural logarithm of the transmittance of the filter medium and the pressure loss as follows. QF [1 / Pa] =-ln (transmittance [%]) / pressure loss [P
a] Here, the transmittance indicates how much particles having a particle diameter of 0.3 μm are transmitted when air is passed through the filter medium at a wind speed of 5.3 cm / sec. Is a value when air is passed at a wind speed of 5.3 cm / sec.
【００１９】通常のコロナ放電方式でのエレクトレット
不織布濾材のＱＦ値は０．０５程度であるが、不織布に
水を接触させた後、乾燥させることにより電荷を生じさ
せたハイドロチャージ方式エレクトレット不織布濾材の
場合には０．１以上とすることが可能である。これは、
ハイドロチャージ方式では不織布の電荷密度を高くでき
るため、同じ圧力損失でも透過率を低くできるためであ
る。すなわち、より低圧力損失で透過率が低いすなわち
捕集効率が高くなり、目詰まりしにくく捕集効率の低下
も少ない長寿命なフィルタが作製できる。The QF value of the electret nonwoven fabric filter material in the ordinary corona discharge method is about 0.05. However, after the water is brought into contact with the nonwoven fabric and dried, the hydrocharge type electret nonwoven fabric filter material is generated. In this case, it can be 0.1 or more. this is,
This is because the charge density of the nonwoven fabric can be increased in the hydrocharge method, so that the transmittance can be reduced even with the same pressure loss. That is, a filter having a lower pressure loss, a lower transmittance, that is, a higher collection efficiency, a filter that is less likely to be clogged and a reduction in the collection efficiency is less likely to be produced can be manufactured.
【００２０】また、本発明において、機械的捕集効率が
７０〜９９．９９％の範囲の濾材７としては、ガラス繊
維を含む濾材やフッソ系の微多孔膜などを使用できる
が、ガラス繊維を含む濾材の場合、濾材の強度は高め、
濾材の厚さは薄くでき、さらに、フッソ系の微多孔膜等
よりも目詰まりが発生しにくいので好ましい。ガラス繊
維を含む濾材の場合、平均繊維径が０．５〜３μｍ範囲
になるように構成すると安定した捕集効率が得られるの
で好ましい。In the present invention, as the filter medium 7 having a mechanical collection efficiency in the range of 70 to 99.99%, a filter medium containing glass fiber or a fluorine-based microporous membrane can be used. In the case of a filter medium containing, the strength of the filter medium is increased,
The thickness of the filter medium can be reduced, and furthermore, clogging is less likely to occur than a fluorine-based microporous membrane or the like, which is preferable. In the case of a filter medium containing glass fibers, it is preferable to configure the filter so that the average fiber diameter is in the range of 0.5 to 3 μm because stable collection efficiency can be obtained.
【００２１】上述のエレクトレット不織布濾材２〜６は
超音波によって部分的に相互接合することが好ましい。
接合面積は１０％以下にすることが低圧力損失化・長寿
命化のためにより好ましい。また、第１の濾層Ａと第２
の濾層Ｂとの間は、通常接合せずに重ね合わせる方式で
積層一体化するが、ホットメルト樹脂などで部分的に接
合を行ってもよい。It is preferable that the above-mentioned electret nonwoven fabric filters 2 to 6 are partially joined to each other by ultrasonic waves.
It is more preferable that the joining area be 10% or less for lowering the pressure loss and extending the life. In addition, the first filter layer A and the second
The filter layer B is usually laminated and integrated by a method of overlapping without joining, but may be partially joined with a hot melt resin or the like.
【００２２】このように積層したフィルタは、たとえば
山谷状に折り加工し、枠体内に脱臭のための脱臭剤とと
もに収納し、電子写真方式によるトナー像の定着器に設
けてトナー像を定着する際の排気流体を処理することが
好ましい。さらに、本発明のフィルタを備えた定着器を
プリンタまたは複写機に設けることも好適である。脱臭
剤としては活性炭が種々の臭い成分に対しバランス良く
吸着するので好ましく、この他にセピオライトなども用
いることができる。活性炭を収納する場合には、脱臭力
の長期維持のために上述の濾材よりも下流側に配置する
ことが好ましい。また、濾材を山谷状に折り加工するこ
とで、濾材における風速を低下して圧力損失上昇をさら
に遅らせることが可能となる。これは、目詰まりによる
圧力損失上昇が風速のほぼ１．５乗に比例して発生する
ためである。The filter thus laminated is folded into, for example, a mountain-valley shape, housed in a frame together with a deodorizing agent for deodorization, and provided in an electrophotographic toner image fixing device for fixing the toner image. Preferably, the exhaust fluid is treated. Further, it is preferable to provide a fixing device provided with the filter of the present invention in a printer or a copying machine. Activated carbon is preferred as a deodorant because it adsorbs various odor components in a well-balanced manner. Sepiolite and the like can also be used. When accommodating activated carbon, it is preferable to arrange it downstream of the above-mentioned filter medium in order to maintain the deodorizing power for a long time. Further, by folding the filter medium into a mountain valley shape, it is possible to reduce the wind speed in the filter medium and further delay the rise in pressure loss. This is because an increase in pressure loss due to clogging occurs in proportion to approximately 1.5 power of the wind speed.
【００２３】[0023]
【実施例】＜実施例１＞図１に示すフィルタを山高さが
３０ｍｍ、山ピッチが９．１ｍｍ、山数５３、濾材幅２
８０ｍｍになるように折り加工し、サイズ５００×３０
０×５０の枠体内に収納するとともに、流体流入方向に
関してその濾材の下流側に４００ｇのヤシガラ活性炭を
配置して、このフィルタユニットを電子写真式プリンタ
ーの脱煙脱臭フィルタとして評価した。なお、フィルタ
の各層の構成は表１に示すとおりで、第１の濾層として
の捕集効率は９９．９９７％であった。Embodiment 1 The filter shown in FIG. 1 has a peak height of 30 mm, a peak pitch of 9.1 mm, a number of peaks of 53, and a filter material width of 2.
Folded to 80mm, size 500 × 30
The filter unit was housed in a 0 × 50 frame, and 400 g of coconut shell activated carbon was disposed downstream of the filter medium in the fluid inflow direction. This filter unit was evaluated as a deodorizing filter for an electrophotographic printer. The configuration of each layer of the filter was as shown in Table 1, and the collection efficiency of the first filter layer was 99.997%.
【００２４】[0024]
【表１】 [Table 1]
【００２５】この脱煙脱臭フィルタを電子写真式プリン
ター（富士通（株）製品番号Ｆ６７６１）に装着しトナ
ーはポリエステル系樹脂バインダーとワックスが混合さ
れたものを用いて寿命試験を実施した。この時、トナー
定着部から発生する排出粉塵濃度はデジタル式粉塵計
（ＳＨＩＢＡＴＡ（株）製機種Ｐ−５Ｈ）で測定したと
ころ印字率２０％で１６ｍｇ／ｍ3であったが、フィル
タを通して排出される排出粉塵濃度は、試験開始直後で
０．０６ｍｇ／ｍ3 以下で、さらに、初期圧力損失が４
９０Ｐａ上昇した時点でも０．０６ｍｇ／ｍ3 で、５０
万頁の印刷を達成できた。 ＜実施例２＞ガラス濾材を捕集効率９９．８％のものに
変えた以外は実施例１と同様にして寿命試験を実施し
た。その結果、フィルタを通して排出される排出粉塵濃
度は、試験開始直後で０．０１ｍｇ／ｍ3以下、さらに
初期圧力損失が４９０Ｐａ上昇した時点でも０．０１ｍ
ｇ／ｍ3 以下で、７２万頁の印刷を達成できた。 ＜実施例３＞上流側に平均繊維径１５μｍで目付１００
ｇ／ｍ2のエレクトレット不織布濾材を、下流側に平均
繊維径４μｍで目付４０ｇ／ｍ2のエレクトレット不織
布濾材を積層したエレクトレット不織布濾材（捕集効率
９９．９９５％、圧力損失２９Ｐａ、ＱＦ値０．１８）
を実施例１の第１の濾材に変えて同様のフィルタを作製
し、実施例１と同様にして寿命試験を実施した。その結
果、フィルタを通して排出される排出粉塵濃度は、試験
開始直後で０．０５ｍｇ／ｍ3以下、さらに、初期圧力
損失が４９０Ｐａ上昇した時点でも０．０５ｍｇ／ｍ3
で、８０万頁の印刷を達成できた。 ＜比較例１＞ガラス濾材を捕集効率６０％のものに変え
た以外は実施例１と同様にした。その結果、フィルタを
通して排出される排出粉塵濃度は、試験開始直後で０．
０６ｍｇ／ｍ3 であったが、段々と濃度が上昇し、印刷
枚数３４万枚の時点で０．１５ｍｇ／ｍ3 を越えてしま
った。 ＜比較例２＞ガラス濾材を捕集効率９９．９９９％のも
のに変えた以外は実施例１と同様にした。その結果、フ
ィルタを通して排出される排出粉塵濃度は試験開始直後
で０．００６ｍｇ／ｍ3 以下であった。しかし、印刷枚
数が３５万頁で、排出粉塵濃度に大して変化は見られな
かったものの圧力損失が４９０Ｐａに達し寿命を迎え
た。 ＜比較例３＞第１の濾層のエレクトレット不織布濾材を
全て非エレクトレット不織布濾材に変え、ガラス濾材を
捕集効率９５％のものに変えた以外は実施例１と同様に
した。その結果、排出粉塵濃度は、運転当初から０．１
５５ｍｇ／ｍ3 で、また、印刷枚数２５万頁で０．１８
ｍｇ／ｍ3 にまで上昇したThe filter was attached to an electrophotographic printer (Fujitsu Co., Ltd., product number F6761), and a life test was conducted using a toner in which a polyester resin binder and wax were mixed. At this time, the density of the discharged dust generated from the toner fixing unit was 16 mg / m 3 at a printing rate of 20% as measured by a digital dust meter (model P-5H manufactured by SHIBATA Co., Ltd.). The discharged dust concentration is 0.06 mg / m 3 or less immediately after the start of the test.
Even when the pressure rises by 90 Pa, it is still 0.06 mg / m 3 ,
Printing of 10,000 pages was achieved. <Example 2> A life test was performed in the same manner as in Example 1 except that the collection efficiency of the glass filter medium was changed to 99.8%. As a result, the concentration of the discharged dust discharged through the filter was 0.01 mg / m 3 or less immediately after the start of the test, and even 0.01 m / m 3 when the initial pressure loss increased by 490 Pa.
At a g / m 3 or less, printing of 720,000 pages could be achieved. Example 3 An average fiber diameter of 15 μm and a basis weight of 100 on the upstream side
g / m 2 electret nonwoven fabric filter material, and an electret nonwoven fabric filter material having an average fiber diameter of 4 μm and a basis weight of 40 g / m 2 laminated on the downstream side (a collection efficiency of 99.995%, a pressure loss of 29 Pa, and a QF value of 0. 18)
Was replaced with the first filter medium of Example 1 to produce a similar filter, and a life test was performed in the same manner as in Example 1. As a result, discharge dust concentration to be discharged through the filter, 0.05 mg / m 3 or less immediately after the start of the test, further, the initial pressure loss at the time of the rise 490 Pa 0.05 mg / m 3
As a result, printing of 800,000 pages was achieved. <Comparative Example 1> The same operation as in Example 1 was performed except that the glass filter medium was changed to one having a collection efficiency of 60%. As a result, the concentration of the discharged dust discharged through the filter was 0.1 mm immediately after the start of the test.
Although the density was 06 mg / m 3 , the density gradually increased and exceeded 0.15 mg / m 3 when the number of printed sheets was 340,000. <Comparative Example 2> The same operation as in Example 1 was performed except that the glass filter medium was changed to one having a collection efficiency of 99.999%. As a result, the concentration of the discharged dust discharged through the filter was 0.006 mg / m 3 or less immediately after the start of the test. However, the number of printed sheets was 350,000 pages, and although there was no significant change in the concentration of discharged dust, the pressure loss reached 490 Pa and the life was reached. <Comparative Example 3> The same operation as in Example 1 was carried out except that the electret nonwoven fabric filter material of the first filter layer was changed to a non-electret nonwoven fabric filter material, and the glass filter material was changed to one having a collection efficiency of 95%. As a result, the discharged dust concentration was 0.1% from the beginning of operation.
55 mg / m 3 , and 0.18 for 250,000 pages
mg / m 3
【００２６】[0026]
【発明の効果】本発明のフィルタは、エレクトレット不
織布濾材を配置してなる、捕集効率が９９％以上である
第１の濾層と、第１の濾層の下流側に配置された、機械
的捕集効率が７０〜９９．９９％の範囲内にある第２の
濾層とを備えているので、高い捕集効率を有するもの
の、第１の濾層の電荷が低減した場合にも下流側に配置
された第２の濾層で粒子を捕集でき、フィルタとしての
捕集効率を維持でき寿命を延ばすことができる。The filter of the present invention comprises a first filter layer having an electret nonwoven fabric filter material and having a collection efficiency of 99% or more, and a mechanical filter disposed downstream of the first filter layer. And a second filter layer having a target collection efficiency in the range of 70 to 99.99%, so that even if the first filter layer has a reduced charge, it has a high downstream collection efficiency even if the charge of the first filter layer is reduced. The particles can be collected by the second filter layer arranged on the side, the collection efficiency as a filter can be maintained, and the life can be extended.
【図１】本発明の一実施態様に係るフィルタの概略断面
図である。FIG. 1 is a schematic sectional view of a filter according to an embodiment of the present invention.
１ ：フィルタ ２〜６：エレクトレット不織布濾材 ７ ：機械的捕集効率が７０〜９９．９９％の範囲の濾
材 Ａ ：第１の濾層 Ｂ ：第２の濾層1: filter 2 to 6: electret nonwoven fabric filter material 7: filter material with a mechanical collection efficiency in the range of 70 to 99.99% A: first filter layer B: second filter layer
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｄ０４Ｈ 1/42 Ｄ０４Ｈ 1/42 Ｂ Ｗ Ｚ 1/70 1/70 Ａ Ｇ０３Ｇ 21/00 ５３８ Ｇ０３Ｇ 21/00 ５３８ Ｆターム(参考） 2H027 JA01 JA03 JB02 JC06 JC08 JC20 4D019 AA01 BA04 BA13 BA17 BB03 BB10 BC01 BC05 BC10 BD01 BD02 CA02 CB04 DA03 4D054 AA20 BC05 BC16 EA04 EA22 EA27 4L047 AA05 AB00 BA23 CA05 CA18 CB10 CC12 ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat ゛ (Reference) D04H 1/42 D04H 1/42 B W Z 1/70 1/70 A G03G 21/00 538 G03G 21/00 538 F term (reference) 2H027 JA01 JA03 JB02 JC06 JC08 JC20 4D019 AA01 BA04 BA13 BA17 BB03 BB10 BC01 BC05 BC10 BD01 BD02 CA02 CB04 DA03 4D054 AA20 BC05 BC16 EA04 EA22 EA27 4L047 AA05 AB00 CA23
Claims (11)
る、捕集効率が９９％以上である第１の濾層と、第１の
濾層の下流側に配置された、機械的捕集効率が７０〜９
９．９９％の範囲内にある第２の濾層とを備えているこ
とを特徴とするフィルタ。1. A first filter layer provided with an electret nonwoven fabric filter medium and having a collection efficiency of at least 99%, and a mechanical filter arranged at a downstream side of the first filter layer having a mechanical collection efficiency of 70%. ~ 9
A second filter layer in the range of 9.99%.
くとも２枚のエレクトレット不織布濾材を含むととも
に、上流側に大きな平均繊維径を有するエレクトレット
不織布濾材が配置され、下流側に小さな平均繊維径を有
するエレクトレット不織布濾材が配置されている、請求
項１に記載のフィルタ。2. The first filter layer includes at least two electret nonwoven fabric filter media having different average fiber diameters, an electret nonwoven fabric filter material having a large average fiber diameter is disposed on the upstream side, and a small average filter material is disposed on the downstream side. The filter according to claim 1, wherein an electret nonwoven fabric filter medium having a fiber diameter is arranged.
の平均繊維径が０．５〜５０μｍの範囲内にある、請求
項１または２に記載のフィルタ。3. The filter according to claim 1, wherein the fibers constituting the electret nonwoven fabric filter medium have an average fiber diameter in the range of 0.5 to 50 μm.
５．３ｃｍ／秒の条件下において粒子径０．３μｍの粒
子に対するＱＦ値が０．１以上のものである、請求項１
〜３のいずれかに記載のフィルタ。4. The electret nonwoven fabric filter medium has a QF value of 0.1 or more for particles having a particle diameter of 0.3 μm under conditions of a filtration air velocity of 5.3 cm / sec.
4. The filter according to any one of items 1 to 3.
求項１〜４のいずれかに記載のフィルタ。5. The filter according to claim 1, wherein the second filter layer contains glass fibers.
ている、請求項１〜５のいずれかに記載のフィルタ。6. The filter according to claim 1, wherein a deodorant layer is disposed downstream of the second filter layer.
項１〜６のいずれかに記載のフィルタ。7. The filter according to claim 1, wherein the total collection efficiency is 99.5% or more.
のいずれかに記載のフィルタ。8. A filter according to claim 1, wherein said filter is a deodorizing / deodorizing filter.
The filter according to any one of the above.
を備えた、電子写真方式によるトナー像の定着器。9. A fixing device for an electrophotographic toner image, comprising the filter according to claim 1.
式によるプリンタまたは複写機。10. An electrophotographic printer or copier comprising the fixing device according to claim 9.
タを用いる、電子写真方式によるトナー像の定着方法。11. An electrophotographic toner image fixing method using the filter according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001111563A JP2002018217A (en) | 2000-04-10 | 2001-04-10 | Filter |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000107682 | 2000-04-10 | ||
| JP2000-107682 | 2000-04-10 | ||
| JP2001111563A JP2002018217A (en) | 2000-04-10 | 2001-04-10 | Filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002018217A true JP2002018217A (en) | 2002-01-22 |
Family
ID=26589762
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001111563A Pending JP2002018217A (en) | 2000-04-10 | 2001-04-10 | Filter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2002018217A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007140288A (en) * | 2005-11-21 | 2007-06-07 | Ricoh Co Ltd | Developing device, process cartridge, image forming apparatus, and toner |
| WO2007135232A1 (en) | 2006-05-18 | 2007-11-29 | Valtion Teknillinen Tutkimuskeskus | Filter structure for filtering a particle-containing gas, method of its manufacture and use of porous paper |
| WO2009031334A1 (en) * | 2007-09-08 | 2009-03-12 | Nippon Muki Co., Ltd. | Filter medium for air filter and air filter |
| JP2016085407A (en) * | 2014-10-28 | 2016-05-19 | コニカミノルタ株式会社 | Image forming apparatus |
| JP2017125975A (en) * | 2016-01-14 | 2017-07-20 | キヤノン株式会社 | Image forming apparatus |
| JP2017156477A (en) * | 2016-02-29 | 2017-09-07 | キヤノン株式会社 | Image forming apparatus |
| CN112709008A (en) * | 2021-01-22 | 2021-04-27 | 常州百朋纺织有限公司 | Rear electret type hot air electrostatic filter cotton and manufacturing method thereof |
| CN115079535A (en) * | 2021-03-15 | 2022-09-20 | 佳能株式会社 | Image forming apparatus |
| EP4060419A1 (en) * | 2021-03-15 | 2022-09-21 | Canon Kabushiki Kaisha | Image forming apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007140288A (en) * | 2005-11-21 | 2007-06-07 | Ricoh Co Ltd | Developing device, process cartridge, image forming apparatus, and toner |
| WO2007135232A1 (en) | 2006-05-18 | 2007-11-29 | Valtion Teknillinen Tutkimuskeskus | Filter structure for filtering a particle-containing gas, method of its manufacture and use of porous paper |
| US8182580B2 (en) | 2006-05-18 | 2012-05-22 | Valtion Teknillinen Tutkimuskeskus | Filter structure for filtering a particle-containing gas, method of its manufacture and use of porous paper |
| WO2009031334A1 (en) * | 2007-09-08 | 2009-03-12 | Nippon Muki Co., Ltd. | Filter medium for air filter and air filter |
| JP2016085407A (en) * | 2014-10-28 | 2016-05-19 | コニカミノルタ株式会社 | Image forming apparatus |
| JP2017125975A (en) * | 2016-01-14 | 2017-07-20 | キヤノン株式会社 | Image forming apparatus |
| JP2017156477A (en) * | 2016-02-29 | 2017-09-07 | キヤノン株式会社 | Image forming apparatus |
| CN112709008A (en) * | 2021-01-22 | 2021-04-27 | 常州百朋纺织有限公司 | Rear electret type hot air electrostatic filter cotton and manufacturing method thereof |
| CN115079535A (en) * | 2021-03-15 | 2022-09-20 | 佳能株式会社 | Image forming apparatus |
| EP4060420A1 (en) * | 2021-03-15 | 2022-09-21 | Canon Kabushiki Kaisha | Image forming apparatus |
| EP4060419A1 (en) * | 2021-03-15 | 2022-09-21 | Canon Kabushiki Kaisha | Image forming apparatus |
| US11543771B2 (en) | 2021-03-15 | 2023-01-03 | Canon Kabushiki Kaisha | Image forming apparatus having duct with convex shaped filter |
| US11698603B2 (en) | 2021-03-15 | 2023-07-11 | Canon Kabushiki Kaisha | Image forming apparatus including filter for removing particulates |
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