JPH0747098B2 - Filter material - Google Patents
Filter materialInfo
- Publication number
- JPH0747098B2 JPH0747098B2 JP60224326A JP22432685A JPH0747098B2 JP H0747098 B2 JPH0747098 B2 JP H0747098B2 JP 60224326 A JP60224326 A JP 60224326A JP 22432685 A JP22432685 A JP 22432685A JP H0747098 B2 JPH0747098 B2 JP H0747098B2
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- Japan
- Prior art keywords
- woven fabric
- heat
- fiber
- fabric layer
- denier
- 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.)
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Description
【発明の詳細な説明】 [産業上の利用分野] 本発明は濾材に関し、詳細には各種設備の空調やクリー
ンルーム用プレフィルター等に用いられ、低圧力損失で
且つ長期間の使用に耐え得る高性能エアーフィルター用
濾材に関するものである。TECHNICAL FIELD The present invention relates to a filter medium, and more particularly to a filter medium which is used for air conditioning of various facilities, a pre-filter for clean rooms, etc., and has a low pressure loss and a high durability that can withstand long-term use. The present invention relates to a filter material for an air filter.
[従来の技術] 近年、高性能エアーフィルタ用濾材として、永久帯電
(エレクトレット化)された極細繊維の不織布を適用す
る試みがなされている。これは帯電による静電気の吸引
力によって粉塵等を保持しようとするものである。該不
織布では粒子除去効率が高くなるという利点があるもの
の、従来から使用されているガラス繊維濾紙と比較した
場合それ自身の曲げ剛性が低いという欠点を有する。即
ち、該不織布単体では折曲げ加工してエアーフィルタ用
濾材として使用する際に、圧力損失による濾材の変形が
大きくなる為、濾材同士が重なり圧力損失の上昇が早期
に発生したり、又強度不足に由来して寸法安定性が悪い
ので高精度の濾材材料として使用するのには不都合があ
った。該不織布の強度・剛性を向上させる為に目付を増
大するという試みもなされているが、濾材としての初期
圧力損失が大きくなり過ぎてしまい、前記ガラス繊維濾
紙に代替できるものではなかった。[Prior Art] In recent years, attempts have been made to apply a non-woven fabric of permanently charged (electretized) ultrafine fibers as a filter material for a high-performance air filter. This is intended to hold dust and the like by the attraction of static electricity due to charging. Although the non-woven fabric has the advantage of high particle removal efficiency, it has the drawback of having a low bending rigidity when compared with the conventionally used glass fiber filter paper. That is, when the nonwoven fabric alone is bent and used as a filter medium for an air filter, the filter medium is largely deformed due to pressure loss, so that the filter mediums are overlapped with each other to cause an increase in pressure loss at an early stage or insufficient strength. Because of the poor dimensional stability, it was inconvenient to use it as a filter material of high precision. Attempts have also been made to increase the areal weight in order to improve the strength and rigidity of the nonwoven fabric, but the initial pressure loss as a filter medium became too large, and it could not be substituted for the glass fiber filter paper.
[発明が解決しようとする課題] 上記問題を解決する為、エレクトレット化した極細繊維
の不織布の下流側に、通気度及び剛性の高い補助部材
(バッキング材)を液状又は粉状の接着剤で貼合せるこ
とにより前記極細繊維の剛性を上げる試みもなされてい
る。該方法は不織布の剛性向上には有効であるが、高接
着強度を得るには多量の接着剤が必要となり、接着剤に
よって不織布に目詰りが生じ、その結果圧力損失が増大
して使用寿命が短くなるという傾向が認められた。一方
接着剤量を極力少なくして使用すると、圧力損失の低下
や使用寿命の長期化は維持できるものの、集塵装置の組
立加工時において不織布及びバッキング材相互間に層間
剥離を生ずるという問題があった。[Problems to be Solved by the Invention] In order to solve the above problems, an auxiliary member (backing material) having high air permeability and rigidity is pasted with a liquid or powder adhesive on the downstream side of a non-woven fabric of electretized ultrafine fibers. Attempts have also been made to increase the rigidity of the ultrafine fibers by combining them. Although this method is effective in improving the rigidity of the nonwoven fabric, a large amount of adhesive is required to obtain high adhesive strength, the adhesive causes clogging of the nonwoven fabric, and as a result, pressure loss increases and service life is extended. The tendency of shortening was recognized. On the other hand, if the amount of adhesive used is as small as possible, the pressure loss can be reduced and the service life can be extended, but there is a problem that delamination occurs between the nonwoven fabric and the backing material during the assembly process of the dust collector. It was
本発明は上記問題点を解決する為、鋭意検討した結果な
されたものであって、層間剥離が発生することなく、低
圧力損失でしかも長期間使用可能な高性能エアーフィル
タ用濾材を提供しようとするものである。In order to solve the above problems, the present invention has been made as a result of extensive studies, and it is an object of the present invention to provide a high-performance air filter medium having a low pressure loss and long-term use without delamination. To do.
[課題を解決するための手段] 上記問題点を解決し得た本発明の構成とは、上流側と下
流側を不織布層で構成した濾材であって、上流側の不織
布層は、表面の全部または一部が芯鞘構造或はサイドバ
イサイド型構造の熱融着性素材で構成され且つ繊度が0.
5〜6デニールの繊維を用い、深さ方向に繊維充填密度
が高くなる様な密度勾配を有する不織布層で構成され、
下流側の不織布層は、平均繊度が0.01〜0.1デニールの
エレクトレット化された微細繊維からなる不織布層で構
成され、上記上流側の不織布層と上記下流側の不織布層
の境界部は、上記上流側を構成する熱融着性素材の熱融
着によって一体化されてなる点に要旨を有するものであ
る。[Means for Solving the Problems] The constitution of the present invention which has been able to solve the above-mentioned problems is a filter medium in which an upstream side and a downstream side are constituted by a non-woven fabric layer, and the non-woven fabric layer on the upstream side has the entire surface. Or part of it is composed of a heat-sealing material with a core-sheath structure or a side-by-side structure and has a fineness of 0.
5 to 6 denier fibers are used, which is composed of a non-woven fabric layer having a density gradient such that the fiber packing density increases in the depth direction,
The downstream non-woven fabric layer is composed of a non-woven fabric layer composed of electretized fine fibers having an average fineness of 0.01 to 0.1 denier, and the boundary portion between the upstream non-woven fabric layer and the downstream non-woven fabric layer is the upstream side. The essential point is that the heat-fusible material constituting the above is integrated by heat fusion.
[作用] まず本発明においては、気体の流れの上流側に配置され
る不織布は表面の全部または一部が熱融着性素材で構成
された繊維を用いることが重要である。[Operation] First, in the present invention, it is important that the non-woven fabric arranged on the upstream side of the gas flow uses fibers whose surface is wholly or partially made of a heat-fusible material.
ここで挙げられる芯鞘構造の繊維は、その少なくとも鞘
部(即ち表層部)が熱融着性であるものである。The core-sheath structure fibers mentioned here are those in which at least the sheath portion (that is, the surface layer portion) is heat-fusible.
芯鞘構造の熱融着繊維を含有する不織布若しくはその前
駆段階であるウエッブは、極細繊維の不織布と重ね合わ
せて熱圧着すると重ね合せ面の全面に亘って熱融着繊維
の鞘部が点状或は線状に極めて細かい間隔で接着が行な
われて強力な層間融着が得られる。即ち、上流側の不織
布層と下流側の不織布層が融着一体化される。当該層間
融着は従来の液状又は粉状接着剤で接着した場合と比較
して、極細繊維の接着剤による目詰りが発生することな
く、所期圧力損失の増大が生じないという効果が得られ
る。Nonwoven fabrics containing heat-sealing fibers with a core-sheath structure, or webs that are precursors to the webs, are superposed with non-woven fabrics of ultrafine fibers, and when thermocompression bonded, the sheaths of the heat-sealing fibers are dot-shaped over the entire overlapping surface. Alternatively, bonding is performed linearly at extremely fine intervals to obtain strong interlayer fusion. That is, the upstream non-woven fabric layer and the downstream non-woven fabric layer are fused and integrated. The interlayer fusion has an effect that, compared with the case where the conventional liquid or powder adhesive is used for adhesion, the adhesive of the ultrafine fibers does not cause clogging and the expected pressure loss does not increase. .
熱融着繊維としては、上記芯鞘構造の複合繊維以外にサ
イドバイサイド型構造の複合繊維が挙げられ、このサイ
ドバイサイド型構造の複合繊維も上記芯鞘構造の繊維と
同様に、熱溶融成分が液滴化や流出を起こさない構造の
複合繊維である。Examples of the heat-sealing fiber include a side-by-side type composite fiber in addition to the core-sheath structure conjugate fiber, and the side-by-side structure conjugate fiber also has a heat-melting component in the form of droplets, similar to the core-sheath structure fiber. It is a composite fiber with a structure that does not cause solidification or outflow.
上記趣旨から明らかであるが、本発明における熱融着繊
維の含有量は少なくとも30%程度以上必要であり、より
好ましくは50%以上であり、場合によっては100%であ
ってもよい。又熱融着繊維含有不織布は難燃性であって
もよく、難燃性の付与方法は何ら限定されないが例えば
難燃剤の内部練込み法や外部からの吹付け、浸漬、塗布
などの方法が挙げられる。As is clear from the above, the content of the heat-sealing fiber in the present invention needs to be at least about 30% or more, more preferably 50% or more, and may be 100% in some cases. Further, the heat-fusible fiber-containing nonwoven fabric may be flame-retardant, and the method of imparting flame-retardancy is not limited at all, but for example, a method of internally kneading a flame-retardant agent or spraying from the outside, dipping, coating, etc. Can be mentioned.
本発明においては、熱融着繊維含有不織布(上流側の不
織布)の繊度は0.5〜6デニールである。つまり繊度が
上記範囲を超えると、濾過されるべき粉塵が当該不織布
で捕集されず、下流側のエレクトレット化された極細繊
維の不織布上に推積してしまい、早期に目詰まりを生じ
濾材の使用寿命の伸長が望めないという結果になってし
まう。In the present invention, the fineness of the heat-sealing fiber-containing nonwoven fabric (nonwoven fabric on the upstream side) is 0.5 to 6 denier. That is, when the fineness exceeds the above range, the dust to be filtered is not collected by the nonwoven fabric and is accumulated on the downstream electretized ultrafine fiber nonwoven fabric, causing clogging at an early stage of the filter medium. The result is that the service life cannot be extended.
次に、本発明においては熱融着繊維含有不織布の厚み方
向に繊維充填密度勾配を付与することが重要である。こ
れは本発明に係る濾材の使用寿命の伸長を図る為であ
る。その成型方法は(1)厚み方向に温度勾配を付けて
熱圧着する方法、(2)2層以上の不織布を用いて熱融
着繊維の混率を厚み方向に勾配を形成する方法、(3)
使用する繊維の繊度で勾配をつける方法、或は(4)粉
末状樹脂を一方向から浸透させて固着することにより密
度勾配をつける方法等が挙げられる。Next, in the present invention, it is important to impart a fiber packing density gradient in the thickness direction of the heat-sealing fiber-containing nonwoven fabric. This is to extend the service life of the filter medium according to the present invention. The molding method is (1) a method of thermocompression bonding with a temperature gradient in the thickness direction, (2) a method of forming a gradient in the mixing ratio of the heat-sealing fibers in the thickness direction by using a nonwoven fabric having two or more layers, (3)
Examples thereof include a method of forming a gradient according to the fineness of the fiber used, or (4) a method of forming a density gradient by infiltrating and fixing the resin powder in one direction.
本発明においては、熱融着繊維含有不織布は繊維構成の
異なる2層以上の不織布を積層して構成してもよい。例
えば多分散の粉塵を捕集する為に、上流側に太い繊維層
若しくは範囲充填密度の小さい層を配置すると共に、下
流側に細い繊維層若しくは繊維充填密度の大きな層を配
置すること、及び熱融着繊維の混率の高い繊維層で剛性
を付与すると共に熱融着繊維の混合率の低い層で粉塵を
保持すること、等も本発明の技術的範囲に含まれる。In the present invention, the heat-sealing fiber-containing nonwoven fabric may be formed by laminating two or more nonwoven fabrics having different fiber configurations. For example, in order to collect polydisperse dust, arrange a thick fiber layer or a layer having a small range packing density on the upstream side and a thin fiber layer or a layer having a large fiber packing density on the downstream side, and heat. It is also within the technical scope of the present invention to impart rigidity with a fiber layer having a high mixing ratio of fusion bonding fibers and to hold dust in a layer having a low mixing ratio of heat bonding fibers.
更に本発明におけるエレクトレット化極細繊維の不織布
(下流側の不織布)は、0.01〜0.1デニールの平均繊度
を有する繊維で構成される必要がある。これは高性能エ
アーフィルタ用濾材として使用する為に粒子除去効率を
可及的に増大させる必要があるからであり、上記範囲よ
りも大きい繊度では粒子除去効率が不十分となる。Further, the non-woven fabric of electretized ultrafine fibers (non-woven fabric on the downstream side) in the present invention needs to be composed of fibers having an average fineness of 0.01 to 0.1 denier. This is because it is necessary to increase the particle removal efficiency as much as possible in order to use it as a filter material for a high performance air filter, and the particle removal efficiency becomes insufficient if the fineness is larger than the above range.
極細繊維の不織布のエレクトレット化は、熱融着繊維含
有不織布と熱融着する前若しくは後のいずれであっても
よい。又本発明における極細繊維不織布としては、ポリ
オレフィン系やポリエステル系等が挙げられるが、殊に
ポリプロピレンが最適である。尚上記エレクトレット化
とは、外部電場を取り去っても正負の帯電が残存してい
る状態を言う。The ultrafine fiber nonwoven fabric may be electretized either before or after heat fusion with the heat fusion bonding fiber-containing nonwoven fabric. Examples of the ultrafine fiber nonwoven fabric in the present invention include polyolefin type and polyester type, and polypropylene is most preferable. The above-mentioned electretization means a state in which positive and negative electrification remains even after removing the external electric field.
[実施例] 実施例1 0.03デニールのポリプロピレンの極細繊維不織布(目付
量40g/m2)と、3デニールの芯鞘構造の熱融着繊維の混
率が70%である1.5デニールのポリエステル繊維のウェ
ッブ(80g/m2)とを重ね合せ、極細繊維の不織布面の型
温度を140℃とし、反対側の面の型温度を135℃として1
分間熱圧着した。次いで熱圧着した濾材々料を直流印加
電圧:+22KV、電極間距離:15mmで50秒間、コロナ放電
による荷電処理を施して極細繊維不織布をエレクトレッ
ト化して本発明に係る濾材(実施例1)を作成した。[Examples] Example 1 A web of 1.5 denier polyester fibers in which the mixing ratio of 0.03 denier polypropylene ultrafine fiber non-woven fabric (weight per unit area 40 g / m 2 ) and 3 denier core-sheath heat-sealing fibers is 70% (80g / m 2 ) and the mold temperature of the non-woven fabric surface of the ultrafine fibers is 140 ℃, and the mold temperature of the opposite surface is 135 ℃.
Thermocompression bonding was performed for a minute. Then, the thermo-compression-bonded filter medium was subjected to a charging treatment by corona discharge for 50 seconds at a DC applied voltage of +22 KV and a distance between electrodes of 15 mm to electretize the ultrafine fiber nonwoven fabric to prepare a filter medium according to the present invention (Example 1). did.
作成した濾材を用いて縦610mm、横610mm、幅150mm寸法
のユニット型エアーフィルタを製造したところ、折り畳
み性が極めて良好なエアーフィルタが得られた。When a unit type air filter having a length of 610 mm, a width of 610 mm and a width of 150 mm was manufactured using the prepared filter medium, an air filter having an excellent folding property was obtained.
次に本発明者らは、上記ユニット型エアーフィルタを用
いて粉塵試験を行なった。その結果を第1表に示す。尚
第1表中には、比較の為市販のガラス繊維濾紙製のユニ
ット型エアーフィルタの粉塵試験結果を比較例1として
同時に示した。第1表において、除去効率はJIS 11種粉
塵を用いたときの比色法効率を示し、粉塵保持量はJIS
15種粉塵を用いたときの圧力損失が30mmAqに達した時点
を寿命と判定し、その時点における保持量を示した。Next, the present inventors conducted a dust test using the above unit type air filter. The results are shown in Table 1. In Table 1, for comparison, the dust test results of a commercially available unit type air filter made of glass fiber filter paper are also shown as Comparative Example 1. In Table 1, the removal efficiency is the colorimetric efficiency when using JIS 11 class dust, and the dust retention amount is JIS
The time when the pressure loss reached 30 mmAq when 15 kinds of dust was used was judged as the life, and the retention amount at that time was shown.
第1表から明らかな様に、実施例1は比較例1と比べて
低圧力損失且つ高除去効率であり、しかも粉塵保持量の
増大に起因して長期間の使用が可能となる。 As is clear from Table 1, Example 1 has lower pressure loss and higher removal efficiency than Comparative Example 1, and can be used for a long period of time due to the increased dust holding amount.
実施例2 1デニールの芯鞘構造の難燃化熱融着繊維:100%含有の
ウエッブ(60g/m2と、上記難燃化熱融着繊維の混率が50
%である3デニールの難燃化ポリエステル繊維のウエッ
ブ(80g/m2)とを重ね合わせ、130℃にて45秒間熱圧着
して2層型熱融着繊維含有不織布を作成した。次いで上
記2層型不織布に、0.03デニールのポリプロピレン極細
繊維の不織布(目付量20g/m2)を重ね合せ140℃にて熱
圧着した後、コロナ放電による荷電処理を施し本発明の
係る濾材(実施例2)を作成した。Example 2 1-denier core-sheath structure flame-retardant heat-sealing fiber: a web containing 100% (60 g / m 2 and the flame-retardant heat-sealing fiber mixed at a mixing ratio of 50).
% Of 3 denier flame-retardant polyester fiber web (80 g / m 2 ) was superposed and thermocompression bonded at 130 ° C. for 45 seconds to prepare a two-layer type heat-sealing fiber-containing nonwoven fabric. Next, a 0.03 denier polypropylene ultrafine fiber non-woven fabric (weight per unit area: 20 g / m 2 ) was superposed on the above two-layer non-woven fabric and thermocompression-bonded at 140 ° C., followed by charging treatment by corona discharge to carry out the filtering material of the present invention (implementation). Example 2) was created.
比較例として、上記実施例2の難燃化2層ウエッブを14
0℃にて45秒間熱圧着して難燃化不織布を作成し、該難
燃化不織布と0.03デニールのポリプロピレン製極細繊維
不織布との間に塩素化ポリエチレンの粉末を均一に散布
し、120℃にて熱圧着して濾材を作成した。用いた塩素
化ポリエチレンの粉末散布量は、20g/m2及び38g/m2であ
り夫々比較例2及び比較例3とした。又他の比較例とし
て、塩素化ポリエチレンの代りに共重合ポリエステル樹
脂のエマルジョン接着剤を固形分で27g/m2塗布して濾材
(比較例4)を製造した。As a comparative example, the flame-retardant two-layer web of Example 2 was used.
Create a flame-retardant non-woven fabric by thermocompression bonding at 0 ° C for 45 seconds, and uniformly disperse the chlorinated polyethylene powder between the flame-retardant non-woven fabric and 0.03 denier polypropylene ultrafine fiber non-woven fabric, and at 120 ° C. And thermocompression bonded to prepare a filter medium. The amount of powder of chlorinated polyethylene used was 20 g / m 2 and 38 g / m 2 , respectively, and they were referred to as Comparative Example 2 and Comparative Example 3, respectively. As another comparative example, a filter medium (Comparative Example 4) was prepared by coating an emulsion adhesive of a copolyester resin instead of chlorinated polyethylene at a solid content of 27 g / m 2 .
上記各濾材について、平板での粉塵試験を行なった。そ
の結果を第2表に示す。尚試験の風速は10cm/秒、濾過
面積は0.25m2であり、第2表中の層間剥離の有無は各濾
材の折畳み加工により判定した。A dust test on a flat plate was performed for each of the above filter media. The results are shown in Table 2. The wind speed in the test was 10 cm / sec, the filtration area was 0.25 m 2 , and the presence or absence of delamination in Table 2 was determined by folding each filter medium.
第2表より明らかな様に、比較例2のものは初期圧損及
び粉塵保持量に関する限りでは実施例2に近い値が得ら
れるが、両不織布の接着強度が低い為層間剥離が発生す
る。一方比較例3,4のものは実用的な接着強度が得られ
るけれども、初期圧損及び粉塵保持量において実施例2
に劣るのが理解される。 As is clear from Table 2, the value of Comparative Example 2 is close to that of Example 2 as far as the initial pressure loss and the amount of dust retained, but delamination occurs due to the low adhesive strength of both nonwoven fabrics. On the other hand, in Comparative Examples 3 and 4, although practical adhesive strength can be obtained, Example 2 was used in the initial pressure loss and the dust holding amount.
Is understood to be inferior to.
実施例3 エレクトレット化される極細繊維の不織布として、0.03
デニールのポリプロピレン製極細繊維不織布(目付量10
0g/m2)用い、該不織布に下記の構成の熱融着繊維含有
不織布を融着した。熱融着繊維含有不織布は、6デニー
ルの芯鞘構造の熱融着繊維の混率が100%のウエッブ
(目付量50g/m2)、1デニールの芯鞘構造の熱融着繊維
の混率が60%である1デニールのポリエステル繊維ウエ
ッブ(目付量35g/m2)、1.5デニールの芯鞘構造の熱融
着繊維の混率が40%である1.5デニールのポリエステル
繊維ウエッブ(目付量50g/m2)、及び3デニールの芯鞘
構造の熱融着繊維の混率が40%であって3デニールのポ
リエステル繊維ウエッブ(目付量50g/m2)を上記記載順
序で積層したものである。この後極細繊維の不織布側に
は平板状の型を、それとは反対側の6デニールのポリエ
ステル繊維ウエッブ側には直径1mmの線形で目開きが5mm
のネットを当て、ゲージ圧力3mmHgで熱圧着した。この
様にして得られた積層体にコロナ放電による荷電処理を
施して本発明に係る濾材(実施例3)を作成した。Example 3 As a non-woven fabric of ultrafine fibers to be electret, 0.03
Denier polypropylene extra fine fiber nonwoven fabric (weight of 10
Using 0 g / m 2 ), a non-woven fabric containing heat-sealing fibers having the following constitution was fused to the non-woven fabric. The non-woven fabric containing heat-sealing fibers has a web of 6% denier and 100% of heat-sealing fibers having a core-sheath structure (weight of 50 g / m 2 ). % Polyester fiber web of 1 denier (weight per unit area of 35 g / m 2 ), 1.5 denier polyester fiber web of core-sheath structure with fusion ratio of 40% (denier weight of 50 g / m 2 ). , And a 3 denier core-sheath structure heat fusion fiber having a mixing ratio of 40% and a 3 denier polyester fiber web (weight per unit area: 50 g / m 2 ) are laminated in the above-mentioned order. After this, a plate-shaped mold was used on the non-woven fabric side of the ultrafine fibers, and a 6-denier polyester fiber web side on the opposite side was linear with a diameter of 1 mm and had an opening of 5 mm.
Was applied and thermocompression bonded with a gauge pressure of 3 mmHg. The thus obtained laminate was subjected to a charging treatment by corona discharge to prepare a filter medium (Example 3) according to the present invention.
作成した濾材を用いてユニット型エアーフィルタを製造
し粉塵試験を行なった。その結果を第3表に示す。又比
較の為第3表には前記比較例1による結果を同時に示し
た。尚エアーフィルタの寿命試験としてJIS 15種粉塵
(混合ダスト)及びその粉塵より粒径の細かいJIS 11種
粉塵について試験し第3表に同時に示したが、実施例3
のものは比較例1に比べていずれの粉塵に対しても長寿
命の性能を示した。A unit type air filter was manufactured using the prepared filter medium and a dust test was conducted. The results are shown in Table 3. For comparison, Table 3 shows the results of Comparative Example 1 at the same time. As a life test of the air filter, JIS 15 type dust (mixed dust) and JIS 11 type dust having a smaller particle size than the dust were tested and shown in Table 3 at the same time.
In comparison with Comparative Example 1, each of them exhibited a long life performance with respect to any dust.
[発明の効果] 以上述べた如く本発明によれば既述の構成を採用するこ
とによって初期圧力損失の増大を抑え、しかも長期間使
用可能且つ高剛性の性能を有する濾材が実現できた。更
に本発明に係る濾材を用いてユニット型エアーフィルタ
を組立てると、上流側の熱融着性素材によって、上流側
と下流側の不織布が熱融着されているので、両不織布間
の接着強度が強固である為、高剛性であるにも拘らず濾
材の折畳性が良好であり組立てが容易であると共に、上
記ユニット型エアーフィルタはメンテナンス性及びラン
ニングコスト低減等の点で顕著な効果を発揮する。 [Advantages of the Invention] As described above, according to the present invention, by adopting the above-described structure, it is possible to realize a filter medium that suppresses an increase in initial pressure loss, is usable for a long period of time, and has high rigidity. Further, when a unit type air filter is assembled using the filter material according to the present invention, the upstream side and the downstream side non-woven fabric are heat-sealed by the heat-fusible material on the upstream side. Since it is strong, the filter medium has good foldability despite its high rigidity and is easy to assemble, and the unit type air filter has remarkable effects in terms of maintainability and running cost reduction. To do.
Claims (1)
であって、 上流側の不織布層は、表面の全部または一部が芯鞘構造
或はサイドバイサイド型構造の熱融着性素材で構成され
且つ繊度が0.5〜6デニールの繊維を用い、深さ方向に
繊維充填密度が高くなる様な密度勾配を有する不織布層
で構成され、 下流側の不織布層は、平均繊度が0.01〜0.1デニールの
エレクトレット化された極細繊維からなる不織布層で構
成され、 上記上流側の不織布層と上記下流側の不織布層の境界部
は、上記上流側を構成する熱融着性素材の熱融着によっ
て一体化されることを特徴とする濾材。1. A filter medium comprising a non-woven fabric layer on the upstream side and the downstream side, wherein the non-woven fabric layer on the upstream side is entirely or partially formed of a heat-sealing material having a core-sheath structure or a side-by-side structure. It is composed of a nonwoven fabric layer having a density of 0.5 to 6 denier and having a density gradient such that the fiber packing density increases in the depth direction. The downstream nonwoven fabric layer has an average fineness of 0.01 to 0.1 denier. Of the non-woven fabric layer made of electretized ultrafine fibers, the boundary between the upstream non-woven fabric layer and the downstream non-woven fabric layer is integrated by heat fusion of the heat fusible material constituting the upstream side. A filter medium characterized by being made into a material.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP60224326A JPH0747098B2 (en) | 1985-10-08 | 1985-10-08 | Filter material |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP60224326A JPH0747098B2 (en) | 1985-10-08 | 1985-10-08 | Filter material |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6283017A JPS6283017A (en) | 1987-04-16 |
JPH0747098B2 true JPH0747098B2 (en) | 1995-05-24 |
Family
ID=16811999
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP60224326A Expired - Fee Related JPH0747098B2 (en) | 1985-10-08 | 1985-10-08 | Filter material |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0747098B2 (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2732474B2 (en) * | 1988-01-28 | 1998-03-30 | 三井化学株式会社 | Electret filter and method of manufacturing the same |
JPH0283014U (en) * | 1988-12-15 | 1990-06-27 | ||
JPH0286617U (en) * | 1988-12-19 | 1990-07-09 | ||
JP2755425B2 (en) * | 1989-05-18 | 1998-05-20 | 三菱製紙株式会社 | Filter materials for high-performance air filters |
US6355135B1 (en) | 1993-01-25 | 2002-03-12 | Daikin Industries, Ltd. | Method of laminating gas permeable sheet material |
JP2007239701A (en) * | 2006-03-10 | 2007-09-20 | San Road:Kk | Duct collecting filter for electric fan |
JP4905661B2 (en) * | 2006-06-23 | 2012-03-28 | Jnc株式会社 | Fiber laminate for filter |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5541292U (en) * | 1978-09-13 | 1980-03-17 | ||
JPS5624013A (en) * | 1979-05-04 | 1981-03-07 | Nitta Kk | Structure of air filter element |
JPS5851929U (en) * | 1981-10-06 | 1983-04-08 | 有限会社応用磁気研究所 | electrolytic discharge cutting machine |
US4632761A (en) * | 1983-08-15 | 1986-12-30 | W. R. Grace & Co. | Centrifugal microconcentrator and methods for its use |
-
1985
- 1985-10-08 JP JP60224326A patent/JPH0747098B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JPS6283017A (en) | 1987-04-16 |
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