JPH06218212A - Nonwoven fabric having gradient of pore size and its production - Google Patents
Nonwoven fabric having gradient of pore size and its productionInfo
- Publication number
- JPH06218212A JPH06218212A JP2603293A JP2603293A JPH06218212A JP H06218212 A JPH06218212 A JP H06218212A JP 2603293 A JP2603293 A JP 2603293A JP 2603293 A JP2603293 A JP 2603293A JP H06218212 A JPH06218212 A JP H06218212A
- Authority
- JP
- Japan
- Prior art keywords
- nonwoven fabric
- air volume
- cartridge filter
- gradient
- melt
- 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.)
- Granted
Links
Landscapes
- Filtering Materials (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】この出願発明は、液体濾過用カー
トリッジフィルターに用いられる不織布及びその製造方
法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-woven fabric used in a cartridge filter for liquid filtration and a method for producing the same.
【0002】[0002]
【従来の技術】多孔性コアに通常の紡績糸や紡毛糸を巻
き付けたワインドカートリッジフィルターは、製造コス
トが低廉であるが、濾過性能が良好でない。また、平均
孔径が異なる複数の不織布を巻回積層した不織布積層型
カートリッジフィルターは、濾過ライフ及び濾過精度は
良好であるが、平均孔径の異なる不織布を別々に製造
し、各々を所定の長さに裁断したうえで、平均孔径の小
さいものから順に並べて巻回積層するという非常に煩雑
な工程を必要とするため製造コストが高いという問題が
ある。2. Description of the Related Art A wind cartridge filter in which a spun yarn or a woolen yarn is wound around a porous core has a low manufacturing cost but a poor filtering performance. Further, the non-woven fabric laminated cartridge filter in which a plurality of non-woven fabrics having different average pore diameters are wound and laminated has good filtration life and filtration accuracy, but non-woven fabrics having different average pore diameters are manufactured separately and each is made to have a predetermined length. There is a problem that the manufacturing cost is high because a very complicated process of arranging and cutting and arranging in order from the one having the smallest average pore size after cutting is performed.
【0003】[0003]
【発明が解決しようとする課題】この出願発明は製造コ
ストが低廉で濾過性能が優れたカートリッジフィルター
として有用な不織布及びその製造方法を提供しようとす
るものである。DISCLOSURE OF THE INVENTION The present invention is intended to provide a non-woven fabric which is useful as a cartridge filter having a low manufacturing cost and an excellent filtering performance, and a manufacturing method thereof.
【0004】[0004]
【課題を解決するための手段】この出願発明は、メルト
ブロー法による不織布の製造において吐出風量を周期的
に変化させることにより長手方向に孔径勾配を有する不
織布を得ることができたものであって、このようにして
製造した不織布を多孔性コアに巻回し、連続的にカート
リッジフィルターを生産することができる。このような
不織布は、吐出風量の制御のみで広範囲に孔径勾配を有
する不織布を製造することが可能となったものである。According to the invention of the present application, a nonwoven fabric having a pore diameter gradient in the longitudinal direction can be obtained by periodically changing the discharge air volume in the production of the nonwoven fabric by the melt blowing method. The non-woven fabric thus produced can be wound around a porous core to continuously produce a cartridge filter. With such a non-woven fabric, it is possible to manufacture a non-woven fabric having a pore diameter gradient in a wide range only by controlling the discharge air volume.
【0005】これまでのものとしては、円筒形繊維状構
造体及びその製造方法(特開昭60−216818)が
あるが、繊維接着がなく、圧力による変化にともない物
性変化が生じその結果性能が低下するために耐圧性に劣
り、吐出風量を上げたとき繊維が飛散するために均一な
シートが得ることが困難であり、繊維径2.5μm以上
を製造する時、水を噴霧しなければならないという点
で、乾燥工程、管理等において問題があった。これに対
してこの出願発明の孔径勾配を有する不織布及びその製
造方法は、繊維接着があるので耐圧性及び寸法安定生に
優れており、加熱圧縮などの後加工が容易に行うことが
でき、しかも、カートリッジ作製時に他の濾材や補強材
と組み合わせることが可能となったものである。また、
これまでに長手方向に孔径勾配を有する不織布は、従来
実施されていない。なお、メルトブロー法による不織布
の製造において、吐出風量を周期的に変化させる方法以
外に、不織布に長手方向に孔径勾配を与える方法として
は、例えば、熱可塑性繊維を使用する場合は、不織布を
熱ロール間に加熱および/または加圧条件を変化させな
がら通すことにより、厚み、密度、空隙率と共に孔径を
変化させる方法がある。また、カード機を用いてウエブ
形成する場合には、カード機への繊維のフィード量を変
化させることにより、厚み、密度、空隙率と共に孔径を
変化させる方法がある。A conventional one is a cylindrical fibrous structure and a manufacturing method thereof (Japanese Patent Laid-Open No. 60-216818). However, there is no fiber adhesion and there is a change in physical properties due to a change due to pressure, resulting in a performance deterioration. It is difficult to obtain a uniform sheet because the fibers are scattered when the amount of discharged air is increased, and it is difficult to obtain a uniform sheet, and water must be sprayed when producing a fiber diameter of 2.5 μm or more. In that respect, there was a problem in the drying process and management. On the other hand, the nonwoven fabric having a pore diameter gradient and the method for producing the same of the present invention have excellent pressure resistance and dimensional stability because they have fiber adhesion, and post-processing such as heat compression can be easily performed, and It is now possible to combine it with other filter materials and reinforcing materials when manufacturing the cartridge. Also,
Up to now, non-woven fabrics having a pore diameter gradient in the longitudinal direction have not been implemented so far. In the production of a nonwoven fabric by the melt blow method, in addition to the method of periodically changing the discharge air volume, as a method of giving a pore diameter gradient in the longitudinal direction to the nonwoven fabric, for example, when using a thermoplastic fiber, the nonwoven fabric is a heat roll. There is a method in which the pore diameter is changed together with the thickness, the density, and the porosity by passing it while changing the heating and / or pressurizing conditions. Further, in the case of forming a web using a card machine, there is a method of changing the feed amount of the fiber to the card machine to change the hole diameter as well as the thickness, density and porosity.
【0006】以下、メルトブロー法による孔径勾配を有
する不織布の製造方法を例にしてこの出願発明を具体的
に説明する。メルトブロー法は、オリフィスから押し出
された溶融ポリマーを、オリフィス近傍から吹き出す空
気または他のガスの加熱気流によって牽引細化し、これ
を捕集して不織布とする方法である。この出願発明で
は、上記加熱気流の吐出風量を周期的に変化させること
で、不織布内に形成される孔の大きさを変化させ、不織
布の生産方向(長手方向)に孔径勾配を与える。他の紡
糸条件が一定である場合、加熱気流の吐出風量が増える
と繊維の細化が進むため繊維は細くなり、繊維に囲まれ
てできる不織布内部の孔の大きさは小さくなる。逆に吐
出風量が減ると、繊維は太く、孔は大きくなる。したが
って、吐出風量を周期的に変化させると、それにともな
って不織布内に形成される孔の孔径が変化し、孔径勾配
が生じる。なお、この場合、樹脂の吐出量は一定である
ため、得られる不織布の目付(単位面積あたりの重量)
はほぼ一定であり、また、空隙率も多少のばらつきはあ
るが、ほぼ一定に保たれる。The invention of this application will be specifically described below by taking as an example a method for producing a nonwoven fabric having a pore diameter gradient by the melt blow method. The melt-blowing method is a method in which a molten polymer extruded from an orifice is drawn and thinned by a heated air stream of air or another gas blown out from the vicinity of the orifice, and this is collected into a nonwoven fabric. In the invention of this application, the size of the holes formed in the nonwoven fabric is changed by periodically changing the discharge air volume of the heating airflow, and a pore diameter gradient is given in the production direction (longitudinal direction) of the nonwoven fabric. When the other spinning conditions are constant, the fibers become finer as the discharge air volume of the heated air stream increases, and the fibers become thin, and the size of the pores inside the nonwoven fabric surrounded by the fibers becomes small. On the contrary, when the discharged air volume decreases, the fibers become thicker and the holes become larger. Therefore, when the amount of discharged air is changed periodically, the hole diameter of the holes formed in the nonwoven fabric changes accordingly, and a hole diameter gradient occurs. In this case, since the discharge amount of the resin is constant, the basis weight of the obtained nonwoven fabric (weight per unit area)
Is almost constant, and the porosity is kept constant, though there is some variation.
【0007】上記不織布に使用されるポリマーは、溶融
紡糸が可能な熱可塑性のものであればよく、例えば、ポ
リオレフィン系、ポリアミド系、ポリエステル系などの
熱可塑性樹脂または熱可塑性エラストマーや、これらを
混合したものが好適である。また、ポリマーのメルトイ
ンデックス(MI)はとくに限定されないが、20〜1
000g/10分の範囲のものがよい。他の紡糸条件が
一定である場合、ポリマーの種類とMIにより、吐出風
量の最大時と最小時でのおおよその繊維径が定まるた
め、そのポリマーを用いて製造した場合の繊維径のおお
よその範囲が定まる。また、ポリマーの吐出量は0.0
5〜0.5cc/min/オリフィス、紡糸温度はポリ
マーの融点より20℃以上高い温度に設定されることが
望ましい。加熱気流の吐出風量は自動弁などにより制御
して周期的に変化させる。吐出風量は連続的に変化させ
ても、段階的に変化させてもよいが、連続的に変化させ
る方が、得られた不織布を用いてカートリッジフィルタ
ーを製造した場合に濾過効率と濾過寿命の優れたものに
なる。なお、吐出風量は、その変化の周期を予め設定し
ておき、自動制御することが望ましい。図1〜6は吐出
風量の周期的変化の例を示すグラフである。The polymer used in the non-woven fabric may be any thermoplastic resin that can be melt-spun, and examples thereof include thermoplastic resins or thermoplastic elastomers such as polyolefins, polyamides, polyesters, and the like, or a mixture thereof. Those that are suitable are preferred. Further, the melt index (MI) of the polymer is not particularly limited, but is 20 to 1
It is preferably in the range of 000 g / 10 minutes. When the other spinning conditions are constant, the approximate fiber diameter at the maximum and minimum discharge air volume is determined by the type of polymer and MI, so the approximate range of fiber diameter when using that polymer Is determined. The discharge amount of polymer is 0.0
5 to 0.5 cc / min / orifice, and the spinning temperature is preferably set to a temperature higher than the melting point of the polymer by 20 ° C. or more. The discharge air volume of the heated air flow is controlled by an automatic valve or the like to be changed periodically. The discharged air volume may be changed continuously or in a stepwise manner, but continuous change is superior in filtration efficiency and filtration life when a cartridge filter is manufactured using the obtained nonwoven fabric. It will be a good thing. It should be noted that the discharge air volume is preferably automatically controlled by presetting the cycle of its change. 1 to 6 are graphs showing examples of periodic changes in the discharge air volume.
【0008】図1は、吐出風量を、設定された最小量か
ら、設定された最大量に上げ、最大量の状態から最小量
の状態まで時間の経過にともなって比例的に連続して減
少させた後、最小量で安定化させるまでを1サイクルと
して、周期的に変化させた例である。このように吐出風
量を変化させて得たメルトブロー不織布は、長手方向に
孔径が小さいものから大きいものへと連続的に変化する
領域と、一定の大きな孔径の短い領域とが交互に出現す
るものとなり、不織布の長手方向に孔径勾配が形成され
る。なお、孔径が小さいものから大きなものへと変化す
るのにともなって、繊維径も細いものから太いものへと
変化する。このメルトブロー不織布を用いてカートリッ
ジフィルターを製造する場合は、1サイクルごとに不織
布を切断し、多孔性コアに孔径の小さな側から巻けばよ
い。FIG. 1 shows that the amount of discharged air is increased from a set minimum amount to a set maximum amount and is continuously and proportionally decreased from the maximum amount state to the minimum amount state with the lapse of time. This is an example of cyclically changing after one cycle until it is stabilized with the minimum amount. In this way, the melt-blown nonwoven fabric obtained by changing the discharge air volume has a region in which the pore diameter changes continuously in the longitudinal direction from a small one to a large one, and a region where a constant large pore diameter is short appears alternately. A pore diameter gradient is formed in the longitudinal direction of the nonwoven fabric. In addition, as the pore diameter changes from a small one to a large one, the fiber diameter also changes from a thin one to a thick one. When a cartridge filter is manufactured using this melt-blown nonwoven fabric, the nonwoven fabric may be cut every cycle and wound on the porous core from the side having a smaller pore size.
【0009】図2は、吐出風量を設定された最大量の状
態から、設定された最小量の状態まで減少させる際に、
図1のように連続的でなく、段階的に減少させた例で、
このように吐出風量を変化させて得たメルトブロー不織
布は、長手方向に孔径が小さいものから大きいものへと
段階的に変化する孔径勾配が形成される。FIG. 2 shows that when the discharge air volume is reduced from the set maximum volume state to the set minimum volume state,
In the example that is not continuous as shown in FIG. 1 but gradually decreased,
In the melt-blown nonwoven fabric obtained by changing the discharge air volume in this way, a pore diameter gradient that gradually changes from a small pore diameter to a large pore diameter is formed in the longitudinal direction.
【0010】図3は、吐出風量を設定された最小量の状
態から、設定された最大量の状態まで時間の経過にとも
なって比例的に連続して増加させた後、最大量で安定さ
せ、つぎに最大量の状態から最小量の状態まで時間の経
過にともなって比例的に連続して減少させた後、最小量
で安定させるまでを1サイクルとして、周期的に変化さ
せた例である。このように吐出風量を変化させて得たメ
ルトブロー不織布は、長手方向に孔径が大きいものから
小さいものへと連続的に変化する領域と、孔径が小さい
ものから大きいものへと連続的に変化する領域とが繰り
返される形で、不織布の長手方向に孔径勾配が形成され
る。このメルトブロー不織布を用いてカートリッジフィ
ルターを製造する場合には、1/2サイクルごとに不織
布を切断し、多孔性コアに孔径の小さな側から巻けばよ
い。この場合、孔径の最小部で吐出風量を最小量から最
大量へと変化させるための不織布のロス分が生じないの
で、より効率的に不織布を利用できる。FIG. 3 shows that the discharge air volume is proportionally and continuously increased with the passage of time from the state of the set minimum volume to the state of the set maximum volume, and then is stabilized at the maximum volume. Next, it is an example in which the cycle is periodically changed from one state of the maximum amount to a state of the minimum amount, which is proportionally and continuously decreased with the passage of time, and then set to be stabilized at the minimum amount as one cycle. The melt-blown non-woven fabric obtained by changing the discharge air volume in this way has a region where the pore size changes continuously in the longitudinal direction from one with a large pore size to a region where it changes continuously from one with a small pore size to a large one. By repeating the above, a pore diameter gradient is formed in the longitudinal direction of the nonwoven fabric. When a cartridge filter is manufactured using this melt-blown nonwoven fabric, the nonwoven fabric may be cut every ½ cycle and wound on the porous core from the side having a smaller pore diameter. In this case, since the loss of the nonwoven fabric for changing the discharge air amount from the minimum amount to the maximum amount does not occur at the minimum hole diameter, the nonwoven fabric can be used more efficiently.
【0011】図4〜6は、吐出風量の1サイクルの変化
を示したものである。図4は、吐出風量を連続的に変化
させる途中で、吐出風量が一定になる期間を設けたもの
で、とくに不織布に特定の孔径の領域を多く設けたい場
合に用いられる。また、図5は、吐出風量を時間の経過
にともなって比例的に連続して変化させる場合に、その
変化率(勾配)を途中で変えたものであり、勾配の緩い
区間で長く生産されることから、例えば、図5のように
吐出風量が少ない区間で勾配が緩い場合、得られる不織
布は孔径の大きな領域がより多いものとなる。なお、吐
出風量を連続的に変化させる場合、必ずしも図1などに
示されるように時間の経過に対して比例的に行う必要は
なく、例えば、図6に示すように、吐出風量の連続的な
変化を、時間の経過に対して曲線上に載るように変化さ
せてもよい。また、図1などの説明では、吐出風量を時
間の経過にともなって連続して減少させた例を示した
が、これとは逆に、吐出風量を時間の経過にともなって
連続して増加するように製造してもよい。4 to 6 show changes in the discharge air volume for one cycle. FIG. 4 shows a period in which the discharge air volume is constant during the continuous change of the discharge air volume, which is used particularly when it is desired to provide a nonwoven fabric with a large number of regions having a specific pore diameter. Further, FIG. 5 shows a change rate (gradient) changed midway when the discharge air volume is proportionally and continuously changed with the passage of time, and is produced long in a section with a gentle gradient. Therefore, for example, when the gradient is gentle in the section where the amount of discharged air is small as shown in FIG. 5, the resulting nonwoven fabric has more regions with large pore diameters. In addition, when continuously changing the discharge air volume, it is not always necessary to perform the discharge air quantity in proportion to the passage of time as shown in FIG. 1 or the like. For example, as shown in FIG. The change may be changed so as to be on a curve over time. Further, in the description of FIG. 1 and the like, an example in which the discharge air volume is continuously decreased with the passage of time has been shown, but conversely, the discharge air volume is continuously increased with the passage of time. May be manufactured as follows.
【0012】カートリッジフィルターに使用する場合、
前記のようにして吐出風量を周期的に変化させて製造し
たメルトブロー不織布の平均孔径は3〜40μmの範囲
にあることが望ましく、また、平均繊維径は0.5〜5
0μmの範囲にあることが望ましい。なお、メルトブロ
ー不織布の空隙率(吐出風量の変化にともなう実質的な
変化はない)は、70〜93%の範囲にあることが望ま
しく、これより空隙率が小さいと塵あいなどの粒子を保
持できる不織布内部の容量が小さくなるため使用寿命が
短くなるおそれがあり、一方、これより空隙率が大きく
なると外力により潰れたり、変形したりするおそれがあ
る。この出願発明の不織布を用いてカートリッジフィル
ターを製造するには、金属、プラスチックなどの多孔筒
からなる多孔性コアに、この出願発明の不織布を孔径の
小さい方を内側にして、順次外側になるにしたがって孔
径が大きくなるように卷回積層することが望ましい。When used in a cartridge filter,
It is desirable that the melt-blown nonwoven fabric produced by periodically changing the discharge air volume as described above has an average pore diameter of 3 to 40 μm and an average fiber diameter of 0.5 to 5 μm.
It is preferably in the range of 0 μm. It should be noted that the porosity of the meltblown nonwoven fabric (substantially no change with changes in the amount of discharged air) is preferably in the range of 70 to 93%, and if the porosity is smaller than this, particles such as dust can be retained. Since the capacity inside the nonwoven fabric becomes small, the service life may be shortened. On the other hand, when the porosity is larger than this, the nonwoven fabric may be crushed or deformed by an external force. To manufacture a cartridge filter using the non-woven fabric of the invention of this application, the non-woven fabric of the invention of the present application is placed inside the porous core made of a perforated cylinder of metal, plastic, etc. Therefore, it is desirable to stack the layers so that the hole diameter becomes large.
【0013】例えば、上記の図1のように吐出風量を周
期的に変化させて製造したメルトブロー不織布を用いて
カートリッジフィルターを製造する場合、メルトブロー
不織布の製造工程の最後に多孔性コアに不織布を巻く工
程を続ければ、カートリッジフィルターを連続的に製造
することができる。この場合、まず、メルトブロー不織
布の設定された最小風量から最大風量に立ち上げた部分
から多孔性コアに巻き、ついで、最大風量から最小風量
まで時間の経過にともなって比例的に連続して吐出風量
を減少させた部分(不織布の孔径は最小孔径から最大孔
径へと変化)を巻き、この後、最小風量で安定させた部
分の途中で不織布を切断して、切断端部を熱接着するこ
とによりカートリッジフィルターを製造する。不織布を
切断した時点で不織布を巻いた多孔性コアと巻いていな
い多孔性コアとを入れ換えることにより、連続的にカー
トリッジフィルターが製造できる。なお、立ち上がり部
分が最も内側にくると、カートリッジフィルターは完全
には内側から外側へと孔径が大きくなる構造とならない
が、立ち上がり部分は孔径が大きいため最も内側に巻か
れていても、濾過精度には殆ど影響しない。For example, when a cartridge filter is manufactured using a melt-blown nonwoven fabric manufactured by periodically changing the discharge air volume as shown in FIG. 1, the nonwoven fabric is wound around a porous core at the end of the melt-blown nonwoven fabric manufacturing process. If the process is continued, the cartridge filter can be continuously manufactured. In this case, first, the portion of the meltblown non-woven fabric that has risen from the set minimum air volume to the maximum air volume is wound around the porous core, and then the maximum air volume to the minimum air volume is proportionally and continuously discharged over time. By winding the part (the pore size of the non-woven fabric changes from the minimum pore size to the maximum pore size), and then cutting the non-woven fabric in the middle of the part stabilized with the minimum air volume and thermally bonding the cut end. Manufacture cartridge filters. A cartridge filter can be continuously manufactured by exchanging the non-rolled porous core with the non-rolled porous core when the non-woven fabric is cut. It should be noted that when the rising portion comes to the innermost side, the cartridge filter does not have a structure in which the hole diameter increases from the inner side to the outer side completely, but since the rising portion has a large hole diameter, even if the rising portion is wound on the innermost side, the filtration accuracy is Has almost no effect.
【0014】なお、上記不織布の強度が弱い場合には、
カートリッジフィルターを製造する際に多孔性コアに巻
く工程にかかるテンションなどにより破損するおそれが
あるため、補強材とともに巻いてもよい。補強材として
は、上記不織布の平均最大孔径よりも目の粗いネット、
メッシュ、織物、編み物、金網、不織布などが使用でき
る。また、上記不織布と共に他の濾材を一緒に巻いて併
用してもよい。とくに、より高精度な濾過性能が求めら
れる場合には、上記方法で得た孔径勾配を有するメルト
ブロー不織布を加熱圧縮加工して、全体の孔径をより小
さくしたものを用いるとよい。When the strength of the non-woven fabric is weak,
It may be wound together with the reinforcing material because it may be damaged by tension applied to the step of winding the cartridge filter when manufacturing the cartridge filter. As the reinforcing material, a net having a coarser mesh than the average maximum pore diameter of the non-woven fabric,
A mesh, a woven fabric, a knitted fabric, a wire mesh, a non-woven fabric or the like can be used. In addition, another filter medium may be wound together with the non-woven fabric and used together. In particular, when more accurate filtration performance is required, it is preferable to use a melt-blown nonwoven fabric having a pore diameter gradient obtained by the above method, which is heat-compressed to have a smaller overall pore diameter.
【0015】[0015]
実施例1 エアースリット幅を0.3mmに調整した750mm幅
のメルトブロー装置を用いて、MI(メルトインデツク
ス)=40のポリプロピレン樹脂をメルトブロー法によ
り、樹脂吐出量0.15cc/min/オリフィス、紡
糸温度290℃の条件で、エアー量(吐出風量)を1.
5〜5.5Nm3/minまで変化させ、ノズルからの
距離(集積距離)が20cmにあるコンベア上に集積し
て、長手方向に孔径勾配を有するメルトブロー不織布を
製造した。これをポリプロピレン製多孔性コアに平均孔
径の小さい方から巻回してカートリッジフィルターを作
製した。(カートリジ:内径3.0cm、外径6.4c
m、長さ25cm)各エアー量に対する濾材の平均孔
径、繊維径を表1に示す。なお、空隙率は約90%で一
定である。Example 1 A polypropylene resin having MI (melt index) = 40 was melt-blown by using a melt-blowing device having a width of 750 mm in which an air slit width was adjusted to 0.3 mm, and a resin discharge rate of 0.15 cc / min / orifice and spinning were performed. At a temperature of 290 ° C, the air volume (discharge air volume) was 1.
The melt blown non-woven fabric having a pore diameter gradient in the longitudinal direction was manufactured by changing the pressure from 5 to 5.5 Nm 3 / min and accumulating it on a conveyor having a distance (accumulation distance) from the nozzle of 20 cm. This was wound around a polypropylene-made porous core from the smaller average pore size to prepare a cartridge filter. (Cartridge: inner diameter 3.0 cm, outer diameter 6.4 c
m, length 25 cm) Table 1 shows the average pore diameter and fiber diameter of the filter medium for each air amount. The porosity is constant at about 90%.
【0016】[0016]
【表1】 エアー量[Nm3/min] 平均孔径[μm] 平均繊維径[μm] 1.5 24 13.6 1.9 23 9.7 2.7 22 8.8 3.5 21 6.0 4.3 19 4.8 5.1 17 2.2 5.5 15 1.5 中央値 平均分布の最大値 単純平均 (エアー量は連続的に変化させており、各値は所定幅
(80cm)における中央値で示されている。不織布は
長さ約560cmで80cmごとに7区間に分け、各値
を測定。)Table 1 Air amount [Nm 3 / min] Average pore diameter [μm] Average fiber diameter [μm] 1.5 24 13.6 1.9 23 9.7 2.7 22 8.8 3.5 21 6. 0 4.3 19 4.8 5.1 17 2.2 2.2 5.5 15 1.5 Maximum value of median average distribution Simple average (air amount is continuously changed, each value is within a predetermined width (80 cm ) The nonwoven fabric has a length of about 560 cm and is divided into 7 sections every 80 cm, and each value is measured.)
【0017】比較例1 エアー量を各々1.5、1.9、2.7、3.5、4.
3、5.1、5.5[Nm3/min]と一定にし、実
施例1と同様の紡糸条件で7種類のメルトブロー不織布
を製造した。この7種類のメルトブロー不織布を各々約
80cmの長さに切断したものをポリプロピレン製多孔
性コアに平均孔径が小さいものから順に接合部を重ねて
巻回積層してカートリッジフィルターを作製した。な
お、濾材の空隙率は、約90%であった。Comparative Example 1 Air amounts of 1.5, 1.9, 2.7, 3.5, 4.
Seven kinds of melt-blown nonwoven fabrics were manufactured under the same spinning conditions as in Example 1 while keeping the values constant at 3, 5.1 and 5.5 [Nm 3 / min]. Cartridge filters were manufactured by cutting each of these seven types of melt-blown nonwoven fabrics into pieces each having a length of about 80 cm, and then winding and laminating the polypropylene porous cores in order from the one having the smallest average pore diameter and winding the joining portions. The porosity of the filter medium was about 90%.
【0018】実施例2 実施例1と同様な方法を用い、エアー量を1.5〜5.
5Nm3/minまで変化させる際に、5.5Nm3/m
inの時間を長くすることにより平均繊維径が1.5μ
mであるものが面積比で50%占め、残りの50%は
2.2〜13.6μmであるメルトブロー不織布を製造
した。(各平均繊維径の部分が占める不織布の長さは、
1.5μm、280cm、2.2、4.8、6.0、
8.8、9.7、13.6μm 各々約46cmであっ
た。)これを多孔性コアに平均孔径の小さい方から巻回
して、カートリッジフィルターを作製した。Example 2 Using the same method as in Example 1, the amount of air is 1.5 to 5.
When changing to 5 Nm 3 / min, 5.5 Nm 3 / m
The average fiber diameter is 1.5μ by increasing the in time.
A melt-blown nonwoven fabric was produced in which m was 50% in area ratio and the remaining 50% was 2.2 to 13.6 μm. (The length of the non-woven fabric occupied by each average fiber diameter is
1.5 μm, 280 cm, 2.2, 4.8, 6.0,
8.8, 9.7 and 13.6 μm, respectively, about 46 cm. ) This was wound around the porous core from the smaller average pore size to prepare a cartridge filter.
【0019】実施例3 実施例1と同様な方法を用い、エアー量を1.5〜3.
5Nm3/minまで変化させ、繊維径が6.0〜1
3.6μmであるメルトブロー不織布を製造した。(各
平均繊維径の部分が占める不織布の長さは、6.0、
8.8、9.7、13.6μm 各140cmであっ
た。)これを多孔性コアに平均孔径の小さい方から巻回
して、カートリッジフィルターを作製した。Example 3 Using the same method as in Example 1, the amount of air is 1.5-3.
The fiber diameter is 6.0 to 1 by changing to 5 Nm 3 / min.
A melt blown non-woven fabric having a thickness of 3.6 μm was produced. (The length of the non-woven fabric occupied by the portion of each average fiber diameter is 6.0,
8.8, 9.7 and 13.6 μm, each 140 cm. ) This was wound around the porous core from the smaller average pore size to prepare a cartridge filter.
【0020】実施例4 実施例1で得られたメルトブロー不織布を加熱圧縮し
て、平均孔径が7〜15μmである濾材を得た。(各区
画(80cm)での平均孔径は、14、12、10、
9、8、7.5、7μmであった。)なお空隙率は約7
0%で一定である。これを多孔性コアに孔径の小さい方
から巻回してカートリッジフィルターを作製した。得ら
れたカートリッジフィルターの濾過精度と濾過寿命とを
以下の方法で測定して表に示した。 <濾過精度>JIS8種の塵あいを分散した濃度10p
pmの液を均一に攪はんしながらカートリッジフィルタ
ーに流量25l/minで通水し、通液開始1分後の清
浄液を採取し、その粒度を粒度分布測定機で測定し、そ
の最大流出粒径より濾過精度とした。 <濾過寿命>JIS8種の塵あいを分散した濃度100
ppmの液を均一に攪拌しながらカートリツジフィルタ
ーに流量25l/minで通水して、圧力損出を測定
し、初期圧力損出との差圧が2.0kg/cm2になる
までに処理された総通水量を測定し、これを濾過寿命と
した。実施例及び比較例の結果は表3に示すとおりであ
る。Example 4 The meltblown nonwoven fabric obtained in Example 1 was heated and compressed to obtain a filter medium having an average pore size of 7 to 15 μm. (The average pore size in each section (80 cm) is 14, 12, 10,
It was 9, 8, 7.5 and 7 μm. ) The porosity is about 7
It is constant at 0%. This was wound around a porous core from the smaller pore size to prepare a cartridge filter. The filtration accuracy and filtration life of the obtained cartridge filter were measured by the following methods and shown in the table. <Filtration accuracy> Concentration 10p with JIS 8 types of dust dispersed
While uniformly stirring the pm liquid, water was passed through the cartridge filter at a flow rate of 25 l / min, and a clean liquid was collected 1 minute after the start of liquid feeding, and the particle size was measured with a particle size distribution analyzer, and its maximum outflow Filtration accuracy was determined from particle size. <Filtration Lifetime> Concentration 100 with JIS 8 type dust dispersed
While the ppm solution is uniformly stirred, water is passed through the Cartridge filter at a flow rate of 25 l / min, the pressure loss is measured, and the treatment is performed until the pressure difference from the initial pressure loss becomes 2.0 kg / cm 2. The total amount of water passed was measured and this was taken as the filtration life. The results of Examples and Comparative Examples are shown in Table 3.
【0021】[0021]
【表3】 以上の実施例、比較例から明らかな通り、本実施例のカ
ートリッジフィルターは、同じ濾過精度のものを比較し
た場合、著しく濾過寿命が長くなることがわかる。[Table 3] As is clear from the above Examples and Comparative Examples, the cartridge filter of this Example has a significantly longer filtration life when compared with those having the same filtration accuracy.
【0022】[0022]
【発明の効果】この出願発明の不織布で製造したカート
リッジフィルターは、コストが安価であって、しかも、
濾過ライフ及び濾過精度が良好であり、また、製造にあ
たっては、1つの工程でカートリッジが生産できるとい
う優れた効果を有する。The cartridge filter manufactured from the nonwoven fabric of the present invention has a low cost, and
It has excellent filtration life and filtration accuracy, and has an excellent effect that a cartridge can be produced in one step in manufacturing.
【図1】吐出風量の周期的変化の1例を示すグラフであ
るFIG. 1 is a graph showing an example of periodic changes in discharge air volume.
【図2】吐出風量の周期的変化の1例を示すグラフであ
るFIG. 2 is a graph showing an example of a periodic change in discharge air volume.
【図3】吐出風量の周期的変化の1例を示すグラフであ
るFIG. 3 is a graph showing an example of a periodic change in discharge air volume.
【図4】吐出風量の周期的変化の1例を示すグラフであ
るFIG. 4 is a graph showing an example of a periodic change in discharge air volume.
【5図】吐出風量の周期的変化の1例を示すグラフであ
るFIG. 5 is a graph showing an example of a periodic change in discharge air volume.
【図6】吐出風量の周期的変化の1例を示すグラフであ
るFIG. 6 is a graph showing an example of a periodic change in discharge air volume.
Claims (3)
巻回したカートリッジフィルター。2. A cartridge filter in which the nonwoven fabric according to claim 1 is wound around a porous core.
において、吐出風量を周期的に変化させることを特徴と
する長手方向に孔径勾配を有する不織布の製造方法3. A method for manufacturing a non-woven fabric having a pore diameter gradient in the longitudinal direction, characterized in that the amount of discharged air is changed periodically in the method for manufacturing a non-woven fabric by the melt blow method.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP02603293A JP3373877B2 (en) | 1993-01-22 | 1993-01-22 | Nonwoven fabric having pore diameter gradient and method for producing the same |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP02603293A JP3373877B2 (en) | 1993-01-22 | 1993-01-22 | Nonwoven fabric having pore diameter gradient and method for producing the same |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH06218212A true JPH06218212A (en) | 1994-08-09 |
JP3373877B2 JP3373877B2 (en) | 2003-02-04 |
Family
ID=12182370
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP02603293A Expired - Lifetime JP3373877B2 (en) | 1993-01-22 | 1993-01-22 | Nonwoven fabric having pore diameter gradient and method for producing the same |
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Country | Link |
---|---|
JP (1) | JP3373877B2 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005152769A (en) * | 2003-11-25 | 2005-06-16 | Asahi Kasei Fibers Corp | Filter medium |
JP2015093259A (en) * | 2013-11-13 | 2015-05-18 | ダイワボウホールディングス株式会社 | Cylindrical filter |
CN106573191A (en) * | 2014-08-06 | 2017-04-19 | 克拉克引擎移动解决方案有限责任公司 | Composite high efficiency filter media with improved capacity |
-
1993
- 1993-01-22 JP JP02603293A patent/JP3373877B2/en not_active Expired - Lifetime
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005152769A (en) * | 2003-11-25 | 2005-06-16 | Asahi Kasei Fibers Corp | Filter medium |
JP2015093259A (en) * | 2013-11-13 | 2015-05-18 | ダイワボウホールディングス株式会社 | Cylindrical filter |
CN106573191A (en) * | 2014-08-06 | 2017-04-19 | 克拉克引擎移动解决方案有限责任公司 | Composite high efficiency filter media with improved capacity |
Also Published As
Publication number | Publication date |
---|---|
JP3373877B2 (en) | 2003-02-04 |
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