JPH031046B2 - - Google Patents
Info
- Publication number
- JPH031046B2 JPH031046B2 JP3750986A JP3750986A JPH031046B2 JP H031046 B2 JPH031046 B2 JP H031046B2 JP 3750986 A JP3750986 A JP 3750986A JP 3750986 A JP3750986 A JP 3750986A JP H031046 B2 JPH031046 B2 JP H031046B2
- Authority
- JP
- Japan
- Prior art keywords
- surface charge
- charge density
- nonwoven fabric
- fineness
- density
- 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.)
- Expired
Links
- 239000004745 nonwoven fabric Substances 0.000 claims description 28
- 239000004744 fabric Substances 0.000 claims description 9
- 238000003475 lamination Methods 0.000 claims description 8
- 239000004750 melt-blown nonwoven Substances 0.000 claims description 8
- 238000010030 laminating Methods 0.000 claims description 2
- 239000000428 dust Substances 0.000 description 10
- 239000000463 material Substances 0.000 description 8
- -1 polypropylene Polymers 0.000 description 7
- 239000004743 Polypropylene Substances 0.000 description 6
- 239000000470 constituent Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 229920001155 polypropylene Polymers 0.000 description 6
- 239000002344 surface layer Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 239000000835 fiber Substances 0.000 description 4
- 238000005304 joining Methods 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 230000010287 polarization Effects 0.000 description 4
- 229920000728 polyester Polymers 0.000 description 4
- 239000002759 woven fabric Substances 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 230000001747 exhibiting effect Effects 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000002301 combined effect Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000000123 paper Substances 0.000 description 1
- 229920002239 polyacrylonitrile Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 238000009958 sewing Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/28—Plant or installations without electricity supply, e.g. using electrets
Landscapes
- Chemical Or Physical Treatment Of Fibers (AREA)
- Filtering Materials (AREA)
- Electrostatic Separation (AREA)
- Laminated Bodies (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
低圧損、高捕集効率に優れた積層エレクトレツ
トフイルタに関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a laminated electret filter that is excellent in low pressure loss and high collection efficiency.
実公昭58−51929号公報に記載のごとく、エレ
クトレツト化フイルムをスプリツト化して、フイ
ルタ材として用い、それにスパンボンド不織布を
積層したエアーフイルタがある。
As described in Japanese Utility Model Publication No. 58-51929, there is an air filter in which an electrified film is split and used as a filter material, and a spunbond nonwoven fabric is laminated thereon.
このエアフイルタは、スパンボンド不織布をエ
アー中の粒子との摩擦で帯電した粒子を補集する
ものである。 This air filter collects particles that are charged by friction between spunbond nonwoven fabric and particles in the air.
またこのフイルムから形成されたエレクトレツ
トフイルタは、エレクトレツト化したスプリツト
フアイバーがランダムにシート内で配列して構成
されているため、フイルタ内での電気分極の向き
は第６図に示すようにランダム構成となつてい
る。このため内部で相互にキヤンセルして、外部
へ電気力を及ぼさない。 Furthermore, since the electret filter formed from this film is composed of electrified split fibers arranged randomly within the sheet, the direction of electrical polarization within the filter is as shown in Figure 6. It has a random composition. Therefore, they cancel each other internally and do not apply electric force to the outside.
したがつて、捕集粒子が、エレクトレツトフイ
ルタ内に入つてこないと、電気力による捕集がで
きない。故に、捕集効率の向上もできないし、
又、エレクトレツトフイルタ内にダスト付着が集
中するため、圧力損失の上昇をきたす欠点があつ
た。 Therefore, unless the collected particles enter the electric filter, they cannot be collected by electric force. Therefore, it is not possible to improve the collection efficiency,
Further, since dust adhesion concentrates inside the electret filter, there is a drawback that pressure loss increases.
本発明の目的は、上述の欠点を解消し、長期に
亘つて高捕集効率と低圧損失を維持するフイルタ
を提供するものである。
SUMMARY OF THE INVENTION The object of the present invention is to provide a filter that overcomes the above-mentioned drawbacks and maintains high collection efficiency and low pressure loss over a long period of time.
すなわち、本発明は表面電荷密度の異なる繊維
状シートが少なくとも２枚積層されてなるフイル
タであつて、表面電荷密度の高い繊維状シートは
細繊度で構成され、かつ表面電荷密度の低い繊維
状シートは太繊度で構成されていることを特徴と
する積層エレクトレツトフイルタに関するもので
ある。
That is, the present invention provides a filter in which at least two fibrous sheets with different surface charge densities are laminated, wherein the fibrous sheet with high surface charge density is composed of fine fineness, and the fibrous sheet with low surface charge density This relates to a laminated electret filter characterized by being constructed with a large fineness.
本発明の実施態様を図示する。 1 illustrates an embodiment of the invention.
第１図は太繊度、低表面電荷密度からなる不織
布２と、細繊度、高表面電荷密度からなる不織布
３からなる積層エレクトレツトフイルタ１ａであ
る。 FIG. 1 shows a laminated electret filter 1a consisting of a nonwoven fabric 2 having a large fineness and a low surface charge density, and a nonwoven fabric 3 having a fineness and a high surface charge density.
第２図は、本発明に係る他の一例を示すもので
太繊度、低表面電荷密度からなる織物４と、細繊
度、高表面電荷密度からなる不織布３とからなる
積層エレクトレツトフイルタ１ｂである。 FIG. 2 shows another example of the present invention, which is a laminated electret filter 1b comprising a woven fabric 4 having a large fineness and a low surface charge density, and a nonwoven fabric 3 having a fineness and a high surface charge density. .
第３図は、本発明に係るさらに他の一例を示す
もので、太繊度、低表面電荷密度からなる不織布
２と中繊度、中表面電荷密度からなる不織布５
と、細繊度、高表面、電荷密度からなる不織布３
とからなる積層エレクトレツトフイルタ１ｃであ
る。 FIG. 3 shows still another example according to the present invention, in which a nonwoven fabric 2 having a large fineness and a low surface charge density, and a nonwoven fabric 5 having a medium fineness and a medium surface charge density.
Nonwoven fabric 3 consisting of fine fineness, high surface, and charge density.
This is a laminated electret filter 1c consisting of the following.
本発明の積層エレクトレツトフイルタは表層部
が太繊度で構成されているため気孔径が大きくま
た、繊維は低い表面電荷を持つため、機械的捕集
と静電気捕集併用効果によつて、大きなダストを
捕集し、かつ静電気力によつて、一度付着したダ
ストは強固に付着し、再飛散を防ぐ。 The laminated electret filter of the present invention has a large pore size because the surface layer is made of thick fineness, and the fibers have a low surface charge, so the combined effect of mechanical collection and electrostatic collection makes it possible to collect large amounts of dust. Collects dust, and due to the electrostatic force, once attached, the dust adheres firmly and prevents it from scattering again.
また表層部を通過した細いダストは細繊度で緻
密で気孔径が小さく、高い表面電荷密度による機
械的捕集及び静電気捕集の相乗効果で、高捕集効
率で捕集する。 In addition, the fine dust that has passed through the surface layer is fine, dense, and has small pore diameters, and is collected with high collection efficiency due to the synergistic effect of mechanical collection and electrostatic collection due to high surface charge density.
また、表層部で粗い又は中程度のダストが捕集
されるため、内部での圧力損失の上昇を防止する
ことができる。 Furthermore, since coarse or medium-sized dust is collected in the surface layer, it is possible to prevent an increase in internal pressure loss.
高い表面電荷密度は１×10-10c／cm2以上である
ので外部に対して強い電気力を及ぼすことができ
るため好ましい。さらに好ましくは３×10-10c／
cm2以上が良い。 A high surface charge density of 1×10 −10 c/cm 2 or more is preferable because it can exert a strong electric force to the outside. More preferably 3×10 -10 c/
cm2 or more is better.
又、低い表面電荷密度は、１×10-10c／cm2未満
であるのが好ましい。あまり強い表面電荷密度を
持つと、表層部でのダスト付着が多くなり、目詰
りの原因となる。 Also, the low surface charge density is preferably less than 1×10 −10 c/cm 2 . If the surface charge density is too strong, more dust will adhere to the surface layer, causing clogging.
積層後の積層エレクトレツトフイルタの表層部
の表面電荷密度は２×10-11c／cm2以上が好まし
い。 The surface charge density of the surface layer portion of the laminated electret filter after lamination is preferably 2×10 −11 c/cm 2 or more.
あまり表面電荷密度が低いと静電気力による捕
集効果が失われるためである。 This is because if the surface charge density is too low, the collection effect due to electrostatic force will be lost.
このため積層する低い表面電荷密度の繊維状シ
ートの目付、厚みなど適切に選定する必要があ
る。 Therefore, it is necessary to appropriately select the basis weight and thickness of the fibrous sheets with low surface charge density to be laminated.
目付などは300ｇ／m2以下が好ましい。 The basis weight etc. is preferably 300g/m 2 or less.
エアーフイルタの性能から、太繊度とは1d以
上、細繊度とは1d未満で、特に0.5d以下が高捕集
効率から好ましい。 From the performance of the air filter, a thick fineness is 1 d or more, and a fine fineness is less than 1 d, and in particular, 0.5 d or less is preferable from the viewpoint of high collection efficiency.
見掛密度も、太繊度で粗構造、細繊度で密構造
にすればさらに効果的である。 As for the apparent density, it will be more effective if the fineness is coarse and coarse, and the fineness is fine and dense.
繊維状シートの形態は、不織布、編織布、紙、
など通気性のあるものである。 The forms of fibrous sheets include non-woven fabric, woven fabric, paper,
It is something that is breathable.
高い表面電荷密度を有する繊維状シート素材
は、ポリオレフイン（ポリプロピレン、ポリエチ
レン、ポリスチレン）弗素系樹脂、ポリエステ
ル、ポリアミド、ポリカーボネート、ポリアクリ
ロニトリル、塩ビ、など体積抵抗率が1012Ω・cm
以上のものが使用できる。 Fibrous sheet materials with high surface charge density include polyolefins (polypropylene, polyethylene, polystyrene), fluorine resins, polyester, polyamide, polycarbonate, polyacrylonitrile, PVC, etc., and have a volume resistivity of 10 to 12 Ω・cm.
More than one can be used.
低い表面電荷密度を有する繊維状シートとして
上記素材の外、天然繊維が使用できる。また、導
電性繊維も使用できる。 In addition to the above-mentioned materials, natural fibers can be used as the fibrous sheet having a low surface charge density. Additionally, conductive fibers can also be used.
高性能フイルタとして繊維状シート形態として
不織布が特に好ましい。 Nonwoven fabrics in the form of fibrous sheets are particularly preferred as high-performance filters.
また高い表面電荷密度を示す不織布としてメル
トブロー不織布が好ましい。 Furthermore, melt-blown nonwoven fabric is preferred as a nonwoven fabric exhibiting high surface charge density.
これは、平均繊度が0.5d以下と細く、かつ、密
構造で表面電荷の維持性に優れている。 This material has a fine average fineness of 0.5d or less, has a dense structure, and has excellent surface charge retention.
このため、低目付でも、80ｇ／m2以下でも高い
表面電荷密度を示し、圧力損失を低くするのでフ
イルタとして好ましい。 For this reason, it exhibits a high surface charge density even at a low basis weight of 80 g/m 2 or less and reduces pressure loss, making it preferable as a filter.
積層エレクトレツトフイルタの積層方法は、第
１〜３図に示す以外にさらに多層化しても良い。
また、高い表面電荷密度を示す繊維状シートとし
て、それ同志の多層の組合せも利用できる。又、
高い表面電荷密度を持つシートを両面より低い表
面電荷密度を示すシートではさむことも可能であ
る。 The method of laminating the laminated electret filter may be one in which more layers than those shown in FIGS. 1 to 3 are used.
Furthermore, a combination of multiple layers of these sheets can also be used as a fibrous sheet exhibiting a high surface charge density. or,
It is also possible to sandwich a sheet with a high surface charge density between sheets exhibiting a lower surface charge density than both sides.
積層の接合方法として、単なる積層の場合もあ
るし、接着剤、融着剤による接合、機械的接合と
して、ニードルパンチ、ウオーターパンチによる
場合、縫製による接合などもある。 The method of joining the laminated layers may be simple lamination, joining using an adhesive or fusing agent, mechanical joining using a needle punch or water punch, or joining by sewing.
次に表面電荷密度を有する繊維状シートの製造
方法を述べる。 Next, a method for producing a fibrous sheet having surface charge density will be described.
第４図に示す方法で、アース電極６上に半導体
材料７を置き、その上にエレクトレツト化する繊
維状シート８を配置して、針状電極９により、高
圧発生機１０を通して直流高電圧印加を行なつて
エレクトレツト化する。 By the method shown in FIG. 4, a semiconductor material 7 is placed on a ground electrode 6, a fibrous sheet 8 to be electrified is placed on top of the semiconductor material 7, and a high DC voltage is applied using a needle electrode 9 through a high voltage generator 10. to convert it into an electret.
エレクトレツト化する雰囲気温度は、繊維状シ
ートの材質によつて適当に変えて行なう。でき上
つたエレクトレツト繊維状シートの電気分極の向
きは、第５図に示すモデル図のごとく、シートの
厚み方向に配向している。 The ambient temperature for electrification is changed appropriately depending on the material of the fibrous sheet. The electric polarization direction of the completed electret fibrous sheet is oriented in the thickness direction of the sheet, as shown in the model diagram shown in FIG.
表面電荷密度の大きさは、印加電圧の大小によ
つてコントロールする。 The magnitude of the surface charge density is controlled by the magnitude of the applied voltage.
又、１×10-10c／cm2以下の繊維状シートには、
エレクトレツト化しない繊維状シートを使用して
も差支えない。 In addition, for fibrous sheets of 1×10 -10 c/cm 2 or less,
There is no problem in using a fibrous sheet that does not become electrified.
測定法について説明する。 The measurement method will be explained.
(1) 見掛密度は、JIS−L1079に記載の見掛比重
に準じて行なつた。但し、厚み測定は、JIS−
L1085に準じた。(1) The apparent density was determined according to the apparent specific gravity described in JIS-L1079. However, the thickness measurement is JIS-
According to L1085.
(2) 体積抵抗率は、JIS−Ｃ−2318に準じて行な
つた。表面電荷密度は第７図に示す装置で行な
つた。(2) Volume resistivity was determined according to JIS-C-2318. Surface charge density was measured using the apparatus shown in FIG.
即ち、測定すべき繊維状シート１１をアースし
た金属板のアース電極１２の上に置き、他の金属
電極（４cm位）１３を上方から試料に接触せしめ
て、試料表面に存在する電荷を静電誘導で金属電
極１３に生じせしめ、この電荷をコンデンサー１
４にためて電位計１５でその電位を測定し、下式
から表面電荷密度を求める。 That is, the fibrous sheet 11 to be measured is placed on the earth electrode 12 of a grounded metal plate, and another metal electrode (approximately 4 cm) is brought into contact with the sample from above to remove the electric charge existing on the sample surface. This electric charge is generated in the metal electrode 13 by induction, and the electric charge is transferred to the capacitor 1.
4, measure the potential with an electrometer 15, and calculate the surface charge density from the following formula.
表面電位密度（ｃ／cm2）＝Ｃ×Ｖ／Ｓ
Ｃ：コンデンサー容量（フアラツド）
Ｖ：電位（ボルト）
Ｓ：電極面積（cm2）
〔実施例〕
実施例 １
表面電荷密度が高い不織布として８×10-10c／
cm2を有するポリプロピレンメルトブロー不織布を
用いた。 Surface potential density (c/cm 2 )=C×V/SC C: capacitor capacity (furad) V: potential (volt) S: electrode area (cm 2 ) [Example] Example 1 As a nonwoven fabric with high surface charge density 8×10 -10 c/
A polypropylene melt-blown nonwoven fabric with cm 2 was used.
構成平均繊度0.03d、目付40ｇ／m2、見掛密度
0.151ｇ／cm3であつた。 Constituent average fineness 0.03d, basis weight 40g/m 2 , apparent density
It was 0.151g/ cm3 .
表面電荷密度の低い不織布として５×10-12c／
cm2を有するポリエステルスパンボンド不織布を用
いた。 5×10 -12 c/ as a nonwoven fabric with low surface charge density
A polyester spunbond nonwoven fabric with cm 2 was used.
構成繊度5d、目付40ｇ、見掛密度0.139ｇ／cm3
であつた。 Constituent fineness 5d, basis weight 40g, apparent density 0.139g/cm 3
It was hot.
積層後の表面電荷密度（表層側）は9.5×．
10-11c／cm2であつた。 The surface charge density after lamination (surface layer side) is 9.5×.
It was 10 -11 c/ cm2 .
表面電荷密度の低い不織布を風上にして本積層
エレクトレツトフイルタをフイルタ評価装置で大
気塵を吸入して、面風速1.5ｍ／minで１カ月間
テストを行なつた。 This laminated electret filter was tested for one month at a surface wind speed of 1.5 m/min by inhaling atmospheric dust using a filter evaluation device with the nonwoven fabric having a low surface charge density facing upwind.
この結果、初期捕集効率は99.6％で、１ケ月間
その性能をほとんど維持し、かつ圧力損失の上昇
も0.5mmaq以下であつた。 As a result, the initial collection efficiency was 99.6%, and the performance was almost maintained for one month, and the increase in pressure loss was less than 0.5 mmaq.
捕集効率は凝縮核測定器（TSI社製）を用いて
粒子カウントして求めた。 The collection efficiency was determined by counting particles using a condensation nucleus analyzer (manufactured by TSI).
実施例 ２
表面電荷密度の高い不織布として8.2×
10-10c／cm2を有するポリプロピレンメルトブロー
不織布を用いた。構成平均繊度は0.01d、目付30
ｇ／m2、見掛密度0.155ｇ／cm3であつた。表面電
荷密度の低い織物として、１×10-11c／cm2を有す
るポリエステルタフタ（単糸繊度3d、タテ、ヨ
コ糸繊度100D）、タテ糸密度112本／in、ヨコ糸
密度89本／in）を用いた。Example 2 8.2× as a nonwoven fabric with high surface charge density
A polypropylene melt-blown nonwoven fabric having a density of 10 -10 c/cm 2 was used. Constituent average fineness is 0.01d, basis weight 30
g/m 2 , and the apparent density was 0.155 g/cm 3 . Polyester taffeta with a low surface charge density of 1×10 -11 c/cm 2 (single yarn fineness 3D, warp and weft yarn fineness 100D), warp yarn density 112 yarns/in, weft yarn density 89 yarns/in ) was used.
積層方法は、表面電荷密度の高いメルトブロー
不織布を２枚積層した後に、表面電荷密度の低い
織物を１枚積層した。 The lamination method was to laminate two sheets of melt-blown nonwoven fabric with high surface charge density, and then laminate one sheet of woven fabric with low surface charge density.
積層後の表面電荷密度（織物表面）は1.8×
10-10c／cm2であつた。 The surface charge density after lamination (fabric surface) is 1.8×
It was 10 -10 c/ cm2 .
本発明のフイルタをフイルタ評価装置に取りつ
けて、２週間、大気塵を用いてテストを実施し
た。 The filter of the present invention was attached to a filter evaluation device and tested using atmospheric dust for two weeks.
面風速は1.5ｍ／minで行なつた。 The surface wind speed was 1.5 m/min.
この結果、初期捕集効率は99.92％、２週間後
も性能はほとんど変らなかつた。 As a result, the initial collection efficiency was 99.92%, and the performance remained almost unchanged even after two weeks.
また圧力損失の上昇は1.2mmaq以下であつた。 Moreover, the increase in pressure loss was less than 1.2 mmaq.
実施例 ３
表面電荷密度の高い不織布として1.2×10-9c／
cm2を有するポリプロピレンメルトブロー不織布を
用いた。構成平均繊度は0.01d、目付40ｇ／m2、
見掛密度0.152ｇ／cm3であつた。Example 3 1.2×10 -9 c/ as a nonwoven fabric with high surface charge density
A polypropylene melt-blown nonwoven fabric with cm 2 was used. Constituent average fineness is 0.01d, basis weight 40g/m 2 ,
The apparent density was 0.152 g/cm 3 .
次いで、表面電荷密度の高い不織布として、３
×10-10c／cm2を有するポリプロピレンメルトブロ
ー不織布を用いた。 Next, as a nonwoven fabric with high surface charge density, 3
A polypropylene melt-blown nonwoven fabric having a diameter of ×10 −10 c/cm 2 was used.
構成平均繊度0.2d、目付40ｇ／m2、見掛密度
0.128ｇ／cm3であつた。 Constituent average fineness 0.2d, basis weight 40g/m 2 , apparent density
It was 0.128g/ cm3 .
表面電荷密度の低い不織布として３×10-12c／
cm2のポリエステルスパンボンド不織布を用いた。
繊度3.5d、目付50ｇ／m2、見掛密度0.25ｇ／cm3で
あつた。 3×10 -12 c/ as a nonwoven fabric with low surface charge density
cm2 polyester spunbond nonwoven fabric was used.
The fineness was 3.5d, the basis weight was 50g/m 2 , and the apparent density was 0.25g/cm 3 .
積層後の表面電荷密度は9.2×10-11c／cm2であ
つた。 The surface charge density after lamination was 9.2×10 −11 c/cm 2 .
本発明シートをフイルタ評価装置に取りつけ
て、大気塵を用いて、１カ月間、面風速1.5ｍ／
minでテストした。 The sheet of the present invention was attached to a filter evaluation device, and atmospheric dust was used for one month at a surface wind speed of 1.5 m/min.
Tested with min.
この結果、初期捕集効率99.94％で１カ月間も
ほとんど変化なかつた。 As a result, the initial collection efficiency was 99.94%, which remained almost unchanged for one month.
また圧力損失の変化も0.5mmaq以下であつた。 Also, the change in pressure loss was less than 0.5 mmaq.
実施例 ４
表面電荷密度の高い不織布として6.0×
10-10c／cm2を有するポリプロピレンメルトブロー
不織布を用いた。構成平均繊度0.01d、目付50
ｇ／m2、見掛密度0.148ｇ／cm3であつた。Example 4 6.0× as a nonwoven fabric with high surface charge density
A polypropylene melt-blown nonwoven fabric having a density of 10 -10 c/cm 2 was used. Constituent average fineness 0.01d, basis weight 50
g/m 2 , and the apparent density was 0.148 g/cm 3 .
表面電荷密度の低い不織布として３×10-12c／
cm2のガラス不織布を用いた。平均繊度0.5d、目
付、70ｇ／m2、見掛密度0.14ｇ／cm3であつた。 3×10 -12 c/ as a nonwoven fabric with low surface charge density
cm 2 glass nonwoven fabric was used. The average fineness was 0.5 d, the basis weight was 70 g/m 2 , and the apparent density was 0.14 g/cm 3 .
積層後の表面電荷密度（ガラス不織布表面）は
9.1×10-11c／cm2であつた
本発明のフイルタを実施例１に示すフイルタ装
置で２週間テストした。 The surface charge density after lamination (glass nonwoven fabric surface) is
9.1×10 -11 c/cm 2 The filter of the present invention was tested in the filter apparatus shown in Example 1 for two weeks.
初期捕集効率は99.8％で、２週間後もほとんど
変化がなかつた。また、圧力損失も0.7mmaq以下
であつた。 The initial collection efficiency was 99.8%, and there was almost no change after two weeks. Moreover, the pressure loss was also less than 0.7 mmaq.
以上述べたごとく、本発明に係る積層フイルタ
は、低圧力損失、高捕集効率に優れている。この
ため、各種用途に用いることができる。例えば、
掃除機用フイルタ、クリールーム用フイルタ、医
療用マスク、産業用フイルタ、空気清浄機用フイ
ルタとして長期間使用できるものである。
As described above, the laminated filter according to the present invention is excellent in low pressure loss and high collection efficiency. Therefore, it can be used for various purposes. for example,
It can be used for a long period of time as a vacuum cleaner filter, clean room filter, medical mask, industrial filter, and air purifier filter.
第１図〜第３図は本発明に係る積層エレクトレ
ツトフイルタを表わす模式図、第４図は表面電荷
密度を有する繊維状シートの製造方法をあらわす
説明図、第５図は本発明の繊維状シートの電気分
極の向きをは表わす模式図、第６図は従来の繊維
状シートの電気分極の向きを表わす模式図、第７
図は表面電荷密度の測定装置を表わす説明図であ
る。
１ａ，１ｂ，１ｃ：エレクトレツトフイルタ、
２：太繊度、低表面電荷密度の不織布、３：細繊
度、高表面電荷密度の不織布、４：太繊度、低表
面電荷密度の織物、５：中繊度、中表面電荷密度
の不織布、６：アース電極、７：半導体材料、
８：繊維状シート、９：針状電極、１０：高圧発
生機、１１：表面電荷密度を持つ繊維状シート、
１２：アース電極、１３：金属電極、１４：コン
デンサー、１５：電位計。
1 to 3 are schematic diagrams showing a laminated electret filter according to the present invention, FIG. 4 is an explanatory diagram showing a method for manufacturing a fibrous sheet having surface charge density, and FIG. FIG. 6 is a schematic diagram showing the direction of electric polarization of the sheet. FIG. 6 is a schematic diagram showing the direction of electric polarization of a conventional fibrous sheet.
The figure is an explanatory diagram showing a surface charge density measuring device. 1a, 1b, 1c: electret filter,
2: Nonwoven fabric with thick fineness and low surface charge density, 3: Nonwoven fabric with fine fineness and high surface charge density, 4: Woven fabric with thick fineness and low surface charge density, 5: Nonwoven fabric with medium fineness and medium surface charge density, 6: Earth electrode, 7: semiconductor material,
8: fibrous sheet, 9: needle-like electrode, 10: high pressure generator, 11: fibrous sheet with surface charge density,
12: Earth electrode, 13: Metal electrode, 14: Capacitor, 15: Electrometer.
Claims (1)
とも２枚積層されてなるフイルタであつて表面電
荷密度の高い繊維状シートは細繊度で構成され、
かつ表面電荷密度の低い繊維状シートは太繊度で
構成されていることを特徴とする積層エレクトレ
ツトフイルタ。 ２ 表面電荷密度の高い繊維状シートの表面電荷
密度が１×10-10c／cm2以上である特許請求の範囲
第１項記載の積層エレクトレツトフイルタ。 ３ 積層後の表面電荷密度が２×10-11c／cm2以上
である特許請求の範囲第１項記載の積層エレクト
レツトフイルタ。 ４ 表面電荷密度の高い繊維状シートの見掛密度
が大きく、表面電荷密度の低い繊維状シートの見
掛密度が小さい特許請求の範囲第１項記載の積層
エレクトレツトフイルタ。 ５ 表面電荷密度の高い繊維状シートが不織布で
ある特許請求の範囲第１項記載の積層エレクトレ
ツトフイルタ。 ６ 表面電荷密度の高い繊維状シートがメルトブ
ロー不織布である特許請求の範囲第１項記載の積
層エレクトレツトフイルタ。[Scope of Claims] 1. A filter formed by laminating at least two fibrous sheets with different surface charge densities, the fibrous sheets with high surface charge density having a fineness,
A laminated electret filter characterized in that the fibrous sheet having a low surface charge density is made of a large fineness. 2. The laminated electret filter according to claim 1, wherein the fibrous sheet with high surface charge density has a surface charge density of 1×10 -10 c/cm 2 or more. 3. The laminated electret filter according to claim 1, which has a surface charge density of 2×10 −11 c/cm 2 or more after lamination. 4. The laminated electret filter according to claim 1, wherein the fibrous sheet with a high surface charge density has a large apparent density, and the fibrous sheet with a low surface charge density has a small apparent density. 5. The laminated electret filter according to claim 1, wherein the fibrous sheet with high surface charge density is a nonwoven fabric. 6. The laminated electret filter according to claim 1, wherein the fibrous sheet with high surface charge density is a melt-blown nonwoven fabric.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3750986A JPS62197118A (en) | 1986-02-24 | 1986-02-24 | Laminated electret filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3750986A JPS62197118A (en) | 1986-02-24 | 1986-02-24 | Laminated electret filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62197118A JPS62197118A (en) | 1987-08-31 |
| JPH031046B2 true JPH031046B2 (en) | 1991-01-09 |
Family
ID=12499499
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3750986A Granted JPS62197118A (en) | 1986-02-24 | 1986-02-24 | Laminated electret filter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62197118A (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3731575A1 (en) * | 1987-09-19 | 1989-03-30 | Freudenberg Carl Fa | FILTER PACK |
| JPH0214709A (en) * | 1988-04-18 | 1990-01-18 | Cambridge Filter Corp | Formation of air filter medium |
| JPH0253110U (en) * | 1988-10-04 | 1990-04-17 | ||
| JPH0389910A (en) * | 1989-09-01 | 1991-04-15 | Toray Ind Inc | Flue gas filter |
| EP3058999B1 (en) * | 2013-10-15 | 2021-09-15 | Yupo Corporation | Filter |
| WO2017164112A1 (en) * | 2016-03-22 | 2017-09-28 | パナソニックＩｐマネジメント株式会社 | Air filter medium |
-
1986
- 1986-02-24 JP JP3750986A patent/JPS62197118A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62197118A (en) | 1987-08-31 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |