JPH0782649A - Blended ultra-fine fiber good and its production - Google Patents
Blended ultra-fine fiber good and its productionInfo
- Publication number
- JPH0782649A JPH0782649A JP6159430A JP15943094A JPH0782649A JP H0782649 A JPH0782649 A JP H0782649A JP 6159430 A JP6159430 A JP 6159430A JP 15943094 A JP15943094 A JP 15943094A JP H0782649 A JPH0782649 A JP H0782649A
- Authority
- JP
- Japan
- Prior art keywords
- ultrafine
- melting point
- fiber
- fibers
- low melting
- 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
Landscapes
- Filtering Materials (AREA)
- Multicomponent Fibers (AREA)
- Nonwoven Fabrics (AREA)
Abstract
Description
【０００１】[0001]
【産業の利用分野】本発明は、メルトブロー法で紡糸さ
れた極細混合繊維、この極細混合繊維からなる繊維製品
及びそれらの製造法に関する。さらに詳しくは、１０℃
以上の融点差がある高融点極細繊維と低融点極細繊維と
からなり、混合繊維中に低融点極細繊維を１０〜９０重
量％含有する極細混合繊維からなる繊維製品及びそれら
の製造法に関する。具体的には、耐圧性と濾過精度が良
く濾過ライフの長い筒状フィルターに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultrafine mixed fiber spun by a melt blow method, a fiber product made of this ultrafine mixed fiber, and a method for producing them. More specifically, 10 ℃
The present invention relates to a fiber product composed of high-melting point ultrafine fibers and low-melting point ultrafine fibers having the above melting point differences, and an ultrafine mixed fiber containing 10 to 90% by weight of the low-melting point ultrafine fiber in the mixed fiber, and a production method thereof. Specifically, the present invention relates to a cylindrical filter having good pressure resistance and filtration accuracy and a long filtration life.
【０００２】[0002]
【従来の技術】極細繊維は不織布や成形体に加工して、
使い捨ておしめの表面材、防塵衣料、マスク、ワイピン
グクロス、精密濾過用フイルター等に広く用いられてい
る。精密濾過用フィルターとしては、電子機器製造工程
の洗浄液のフィルターやエアフィルター、医薬品用水の
プレフィルター、食品や飲料水の微生物除去フイルター
等の用途がある。特開昭５４−１３４１７７号公報に
は、紡糸装置内で熱可塑性樹脂を低粘度に減成してメル
トブロー法で紡糸する極細繊維不織布の製造方法が開示
されている。又、特開昭６０−９９０５７号公報には、
２種類の熱可塑性樹脂を並列型に複合させてメルトブロ
ー法で紡糸する極細複合繊維不織布の製造方法が開示さ
れている。フィルターとしては、特開昭６０−２１６８
１８号公報には、マイクロファイバーを心棒上に集積
し、繊維同志の機械的絡みのみで構造を維持する、空隙
率が一定な精密濾過用フィルターが開示されている。特
開平１ー２９７１１３号公報には、不織布を巻き上げて
得るフイルターにおいて、フイルターの外側になる程繊
維径及び孔径の大きな不織布を用いたフィルターが開示
されている。特開平４−１２６５０８号公報には、メル
トブロー法で作られた極細複合繊維からなるカートリッ
ジフィルターが開示されており、特開平５−９６１１０
号公報には、メルトブロー法で作られた極細複合繊維か
らなる繊維径が順次変化したカートリッジフィルターが
開示されている。2. Description of the Related Art Ultrafine fibers are processed into non-woven fabrics and molded articles,
It is widely used as a surface material for disposable diapers, dust-proof clothing, masks, wiping cloths, filters for microfiltration, etc. The microfiltration filter has uses such as a filter for a cleaning liquid in an electronic device manufacturing process, an air filter, a prefilter for pharmaceutical water, and a filter for removing microorganisms from food and drinking water. Japanese Unexamined Patent Publication No. 54-134177 discloses a method for producing an ultrafine fiber non-woven fabric in which a thermoplastic resin is reduced in viscosity in a spinning device and spun by a melt blow method. Further, Japanese Patent Laid-Open No. 60-99057 discloses that
A method for producing an ultrafine composite fiber non-woven fabric is disclosed, in which two types of thermoplastic resins are combined in parallel and spun by a melt blow method. As a filter, JP-A-60-2168
Japanese Unexamined Patent Publication No. 18 discloses a microfiltration filter having a constant porosity, in which microfibers are accumulated on a mandrel and the structure is maintained only by mechanical entanglement of fibers. Japanese Unexamined Patent Publication No. 1-297113 discloses a filter obtained by rolling up a non-woven fabric, which uses a non-woven fabric having a larger fiber diameter and pore diameter toward the outside of the filter. Japanese Unexamined Patent Publication No. 4-126508 discloses a cartridge filter made of ultrafine composite fibers produced by a melt blowing method.
The publication discloses a cartridge filter made of ultrafine composite fibers produced by the melt-blowing method, in which the fiber diameter is sequentially changed.
【０００３】[0003]
【本発明が解決しようとする課題】従来の単一成分の極
細繊維からなる不織布は、主として繊維同士の絡合によ
って構造が維持されているので、強度が低いとか毛羽立
ちが多いという欠点があり、使い捨ておしめの表面材に
は不適当であった。このような不織布の強度を高める目
的で、加熱ロール等を用いて熱処理すると、繊維が融解
して不織布はフイルム状となり易く、風合いの劣ったも
のになる。又、従来の単一成分の極細繊維を用いたフィ
ルターは、繊維間の接着が少ないので、加熱滅菌処理、
高温濾過、或は振動等により濾過精度が変動したり、硬
度が低く耐圧強度が不充分である等の欠点があった。さ
らに、複合メルトブロー法は、紡糸口金装置が複雑で高
価であり、各吐出孔に異種ポリマーを均等に供給するた
めの溶融粘度調整が困難であるという問題があった。The conventional non-woven fabric composed of ultrafine fibers of a single component has a drawback that the structure is maintained mainly by the entanglement of the fibers, so that the strength is low and fuzzing is large. It was not suitable as a surface material for disposable diapers. When heat treatment is performed using a heating roll or the like for the purpose of increasing the strength of such a non-woven fabric, the fibers are melted and the non-woven fabric is likely to be in the form of a film, resulting in a poor texture. In addition, conventional filters using single-component ultrafine fibers have less adhesion between fibers, so heat sterilization treatment,
There are drawbacks such as that the filtration accuracy varies due to high-temperature filtration or vibration and that the hardness is low and the pressure resistance is insufficient. Further, the composite melt blow method has a problem that the spinneret device is complicated and expensive, and it is difficult to adjust the melt viscosity for uniformly supplying the different polymers to the respective discharge holes.
【０００４】[0004]
【課題を解決するための手段】本発明者らは、上記課題
を解決すべく鋭意研究を重ねた結果、１０℃以上の融点
差がある高融点樹脂と低融点樹脂とを、低融点樹脂の押
し出し量を全押し出し量の１０〜９０重量％となるよう
に調整しながら、それぞれの押出機を用いてメルトブロ
ー法により紡糸して得られる、高融点極細繊維と低融点
極細繊維とからなる極細混合繊維ウエブが、これに適当
な成形加工及び熱処理を施すことにより、優れた性質の
不織布や筒状フイルターに加工できることを知り本発明
を完成するに至った。以下本発明を詳しく説明する。Means for Solving the Problems As a result of intensive studies to solve the above-mentioned problems, the inventors of the present invention have identified a high-melting point resin and a low-melting point resin having a melting point difference of 10 ° C. or more as low melting point resins. Ultrafine mixing of high melting point ultrafine fibers and low melting point ultrafine fibers obtained by spinning by melt blow method using each extruder while adjusting the extrusion amount to be 10 to 90% by weight of the total extrusion amount. The present invention has been completed, knowing that a fibrous web can be processed into a non-woven fabric or a tubular filter having excellent properties by subjecting the fibrous web to appropriate molding and heat treatment. The present invention will be described in detail below.
【０００５】メルトブロー法とは紡糸孔より押し出され
た溶融した熱可塑性樹脂を、紡糸孔の周囲より吹き出さ
れる高温高速気体により捕集コンベアネットまたは回転
する中空心棒上に吹き付け、繊維ウエブを得る方法であ
り、ヴアン・Ａ・ウエンテ(Van A Wente)、インダスト
リアル・アンド・エンジニアリング・ケミストリー(Ind
ustrial and Engineering Chemistry)第４８巻、第８号
（１９５６）第１３４２〜１３４６頁、『スーパー・フ
ァイン・サーモプラスチックス(Super Fine Thermoplas
tics)』や、米国特許第３,５３２,８００号に開示され
ている。高温高速気体には、通常０．５〜１０ｋｇ／ｃ
ｍ2・Ｇ、２００〜５００℃、１〜１００ｍ3／分の空気
や、不活性ガスなどが用いられ、紡糸孔と捕集コンベア
ネットまたは中空心棒との距離は、通常は約５〜８０ｃ
ｍ、好ましくは１５〜６０ｃｍ、さらに好ましくは２０
〜５０ｃｍである。In the melt blow method, a molten thermoplastic resin extruded from a spinning hole is blown onto a collecting conveyor net or a rotating hollow mandrel by a high-temperature high-speed gas blown from around the spinning hole to obtain a fiber web. Method, Van A Wente, Industrial and Engineering Chemistry (Ind
ustrial and Engineering Chemistry, Vol. 48, No. 8 (1956) pp. 132-1346, "Super Fine Thermoplas
tics) ”and U.S. Pat. No. 3,532,800. 0.5 to 10 kg / c for high-temperature high-speed gas
m 2 · G, 200 to 500 ° C., 1 to 100 m 3 / min of air, inert gas, etc. are used, and the distance between the spinning hole and the collecting conveyor net or hollow mandrel is usually about 5 to 80 c.
m, preferably 15-60 cm, more preferably 20
~ 50 cm.
【０００６】本発明の極細混合繊維ウエブは、低融点樹
脂と高融点樹脂が別々の紡糸孔から吐出される紡糸口金
を用いたメルトブロ−法で製造され、低融点樹脂と高融
点樹脂はそれぞれの押出機により紡糸口金に送り込まれ
る。この方法によれば繊維径が２０μｍ以下の２種類の
極細繊維が混合したウエブが容易に得られる。極細混合
繊維ウエブの製造には各種の形式のメルトブロー用紡糸
口金を使用できる。例えば、米国特許第3,981,650号に
記載された一基の紡糸口金に高融点樹脂の紡糸孔と低融
点樹脂の紡糸孔が交互に一列に並んだものが使用でき
る。また、高融点樹脂用の紡糸口金と低融点樹脂用の紡
糸口金を併用し、それぞれの紡糸口金で得られる低融点
極細繊維ウエブと高融点極細繊維ウエブとを積層しても
よい。更に、この積層物にニードルパンチ等の処理をし
て、繊維の混合状態を改良することもできる。より均一
な混合状態の極細混合繊維ウエブを得るには、米国特許
第3,981,650号に記載された紡糸口金を用いる方法が好
ましい。複数の紡糸口金を使用する場合、そのいずれか
に特開昭６０−９９０５７号公報に記載された極細複合
繊維用の紡糸口金を用いることにより、極細混合繊維中
の低融点極細繊維の量を調整することができる。低融点
樹脂と高融点樹脂とに割り当てられる紡糸孔の数を変更
したり、各樹脂の押し出し量を変更することにより、極
細混合繊維中の低融点樹脂繊維の含有量を変更すること
ができる。又、それぞれの樹脂の紡糸孔当たり異なる押
出量で紡糸することにより、繊度の異なる極細繊維の混
合物が得られる。さらに、樹脂の押出量、高温高速気体
の噴出速度等の紡糸条件を経時的にを変化させることに
より、繊維径が経時的に、連続的または段階的に変化し
た極細混合繊維ウエブを得ることができる。このように
繊維径を変化させた極細混合繊維ウエブは、これを後述
の加熱処理することにより、濾過方向に沿って繊維径が
順次変化した筒状フィルターとすることができる。The ultrafine mixed fiber web of the present invention is produced by a melt blow method using a spinneret in which a low melting point resin and a high melting point resin are discharged from separate spinning holes. It is fed into the spinneret by an extruder. According to this method, a web in which two kinds of ultrafine fibers having a fiber diameter of 20 μm or less are mixed can be easily obtained. Various types of melt-blowing spinnerets can be used to produce the ultrafine mixed fiber webs. For example, one spinneret described in U.S. Pat. No. 3,981,650 in which high-melting resin spinning holes and low-melting resin spinning holes are alternately arranged in a line can be used. Further, the spinneret for high melting point resin and the spinneret for low melting point resin may be used together, and the low melting point ultrafine fiber web and the high melting point ultrafine fiber web obtained by each spinneret may be laminated. Further, this laminate can be subjected to treatment such as needle punching to improve the mixed state of the fibers. The method using a spinneret described in U.S. Pat. No. 3,981,650 is preferable in order to obtain an ultrafine mixed fiber web in a more uniform mixed state. When a plurality of spinnerets are used, the amount of the low melting ultrafine fibers in the ultrafine mixed fibers is adjusted by using the spinneret for ultrafine composite fibers described in JP-A-60-99057. can do. By changing the number of spinning holes assigned to the low-melting resin and the high-melting resin, or changing the extrusion amount of each resin, the content of the low-melting resin fiber in the ultrafine mixed fiber can be changed. Also, a mixture of ultrafine fibers having different finenesses can be obtained by spinning at different extrusion rates per spinning hole of each resin. Furthermore, by changing the spinning conditions such as the resin extrusion rate and the high-temperature high-speed gas ejection rate with time, it is possible to obtain an ultrafine mixed fiber web in which the fiber diameter changes continuously or stepwise with time. it can. The ultrafine mixed fiber web whose fiber diameter is changed in this way can be made into a tubular filter in which the fiber diameter is sequentially changed along the filtration direction by subjecting this to a heat treatment described later.
【０００７】本発明の極細混合繊維ウエブの製造に使用
する低融点樹脂と高融点樹脂には、融点の差が１０℃以
上、好ましくは１５℃以上、さらに好ましくは３０℃以
上ある２種類の熱可塑性樹脂を用いる。融点の差が１０
℃未満であると、極細混合繊維ウエブを熱処理して不織
布やフイルター等に加工する際に、低融点極細繊維のみ
ならず高融点極細繊維までが軟化ないし融解し繊維形状
を失い易く、極細混合繊維ウエブ全体がフィルム化する
ことがある。極細混合繊維ウエブがフィルム化すると、
得られる不織布は柔軟性、弾力性、通気性、通水性等の
劣った風合いの悪いものになり、フイルターでは濾過性
能の低いものとなるので不適当である。なお、ここでい
う融点とは、一般的には示差走査熱量計（ＤＳＣ）で測
定される吸熱ピークの温度を意味する。低融点共重合ポ
リエステル等の非晶質の熱可塑性樹脂の場合には、融点
が必ずしも明確に現れないが、軟化点で代用できる。The low-melting point resin and the high-melting point resin used for producing the ultrafine mixed fiber web of the present invention have two types of heat having a difference in melting point of 10 ° C. or higher, preferably 15 ° C. or higher, more preferably 30 ° C. or higher. A plastic resin is used. Difference in melting point is 10
When the temperature is less than ℃, when the ultrafine mixed fiber web is heat-treated and processed into a non-woven fabric or a filter, not only the low-melting ultrafine fibers but also the high-melting ultrafine fibers are easily softened or melted to lose the fiber shape. The entire web may become a film. When the ultrafine mixed fiber web is formed into a film,
The resulting non-woven fabric is inadequate because it has poor softness, elasticity, air permeability, water permeability, etc. and poor texture, and the filter has poor filtration performance. The melting point as used herein generally means the temperature of the endothermic peak measured by a differential scanning calorimeter (DSC). In the case of an amorphous thermoplastic resin such as a low melting point copolyester, the melting point does not always appear clearly, but the softening point can be used instead.
【０００８】本発明の極細混合繊維ウエブに用いる熱可
塑性樹脂として、ポリアミド、ポリエステル、低融点共
重合ポリエステル、ポリスチレン、ポリウレタンエラス
トマー、ポリエステルエラストマー、ポリプロピレン、
ポリエチレン、共重合ポリプロピレン（例えば、プロピ
レンを主体として、エチレン、ブテン−１、４−メチル
ペンテン−１等との二元または三元共重合体）等の熱可
塑性樹脂が例示できる。上記の熱可塑性樹脂の組み合わ
せ例として、ポリエチレン／ポリプロピレン、共重合ポ
リプロピレン／ポリプロピレン、低融点共重合ポリエス
テル／ポリエステル、ポリエチレン／ポリエステルを示
すことができるが、これらの組み合わせに限定されるも
のではない。この中でも、共重合ポリプロピレン／ポリ
プロピレン、低融点共重合ポリエステル／ポリエステル
の組合せは、熱処理による繊維同士の接合力が強く、強
度のある繊維成形物が得られるので好ましい。As the thermoplastic resin used for the ultrafine mixed fiber web of the present invention, polyamide, polyester, low melting point copolyester, polystyrene, polyurethane elastomer, polyester elastomer, polypropylene,
Examples of the thermoplastic resin include polyethylene and copolymerized polypropylene (for example, propylene as a main component, and binary or ternary copolymer with ethylene, butene-1, 4-methylpentene-1, etc.). Examples of combinations of the above-mentioned thermoplastic resins include polyethylene / polypropylene, copolymer polypropylene / polypropylene, low melting point copolymer polyester / polyester, and polyethylene / polyester, but are not limited to these combinations. Among these, the combination of copolymer polypropylene / polypropylene and low melting point copolymer polyester / polyester is preferable because the bonding force between fibers by heat treatment is strong and a strong fiber molded product can be obtained.
【０００９】これらの熱可塑性樹脂はバージンレジンで
あることが好ましいが、再生レジンでも構わない。通常
の紡糸方法では多少糸切れの発生するような原料であっ
ても、メルトブロー法では紡糸性にほとんど影響を受け
ないので、樹脂の種類や融点が明確でありさえすれば再
生レジンでも使用でき、経済的である。These thermoplastic resins are preferably virgin resins, but recycled resins may be used. Even with a raw material that causes some yarn breakage in the normal spinning method, the melt blow method has almost no effect on the spinnability, so it can be used in recycled resin as long as the type and melting point of the resin are clear. It is economical.
【００１０】本発明の極細混合繊維ウエブは、混合繊維
中に低融点極細繊維を１０〜９０重量％、好ましくは２
０〜７０重量％、より好ましくは３０〜５０重量％含有
する。極細混合繊維ウエブ中の低融点極細繊維の含有量
が１０重量％未満の場合、ウエブを熱処理して得られる
不織布や筒状フイルターは、繊維の熱接合点が少なく、
毛羽立の多い、強度の弱いものとなるので好ましくな
い。又、低融点極細繊維の含有量が９０重量％を超える
と、熱処理により繊維形態を失った低融点極細繊維が繊
維間空隙を埋めるようになり、不織布のフイルム化や風
合いの低下、あるいはフイルターの濾過能力の低下の原
因になるので好ましくない。The ultrafine mixed fiber web of the present invention contains 10 to 90% by weight, preferably 2% of low melting point ultrafine fibers in the mixed fiber.
0 to 70% by weight, more preferably 30 to 50% by weight. When the content of the low-melting ultrafine fibers in the ultrafine mixed fiber web is less than 10% by weight, the nonwoven fabric or tubular filter obtained by heat treating the web has few thermal bonding points of fibers,
It is not preferable because it has a lot of fuzz and weak strength. If the content of the low melting ultrafine fibers exceeds 90% by weight, the low melting ultrafine fibers that have lost their fiber morphology due to heat treatment will fill the voids between the fibers, and the nonwoven fabric will become a film and the texture will deteriorate, or the It is not preferable because it causes a decrease in filtration ability.
【００１１】本発明の極細混合繊維ウエブの繊維径には
特別の制限はないが、メルトブロー法を採用することに
より２０μｍ以下の極細繊維が使用でき、紡糸条件の選
定により１５〜０．１μｍ、更には１０〜０．５μｍの
ものが得られる。繊維径が２０μｍ以下のである極細混
合繊維ウエブは、これを後述の熱処理することにより精
密濾過に適したフイルターとすることができる。高融点
極細繊維の繊維径と低融点極細繊維の繊維径は必ずしも
同一である必要はない。また本発明の筒状フィルターに
使用する極細混合繊維ウエブには、上記極細混合繊維を
主に用いるが、濾過精度を損なわない範囲で繊維径２０
μｍ以上の繊維が混合されてもよい。The fiber diameter of the ultrafine mixed fiber web of the present invention is not particularly limited, but ultrafine fibers of 20 μm or less can be used by adopting the melt blow method, and 15 to 0.1 μm can be used depending on the spinning conditions. Of 10 to 0.5 μm is obtained. The ultrafine mixed fiber web having a fiber diameter of 20 μm or less can be made into a filter suitable for microfiltration by subjecting it to a heat treatment described later. The fiber diameter of the high melting ultrafine fibers and the fiber diameter of the low melting ultrafine fibers do not necessarily have to be the same. The above ultrafine mixed fiber web is mainly used for the ultrafine mixed fiber web used in the tubular filter of the present invention, but the fiber diameter is 20 as long as the filtration accuracy is not impaired.
Fibers of μm or larger may be mixed.
【００１２】本発明の不織布は上記の極細混合繊維ウエ
ブを熱処理して得られる。熱処理は、極細混合繊維ウエ
ブの低融点極細繊維の軟化点と高融点極細繊維の軟化点
の間の範囲の温度で行う。熱処理の方法としては、加熱
エンボスロールによる熱圧着法、加熱空気によるエアス
ルー法、あるいは赤外線ランプによる方法等の公知の方
法が使用できる。熱処理により高融点極細繊維はその繊
維形態を維持したまま、低融点極細繊維の融着により固
定されて三次元網目構造となる。このようにして得られ
た不織布は、繊維径が２０μｍ以下の極細繊維で構成さ
れた微細な繊維間空隙を有し、風合いが柔軟で、毛羽立
ちもなく、かつ高強度であるという優れた性質を有す
る。このような優れた性質に基づいて、本発明の不織布
は使い捨ておしめの表面材、防塵衣料、マスク、ワイピ
ングクロス、エアーフイルター等に使用することができ
る。The nonwoven fabric of the present invention is obtained by heat-treating the above ultrafine mixed fiber web. The heat treatment is performed at a temperature in the range between the softening point of the low melting ultrafine fibers and the softening point of the high melting ultrafine fibers of the ultrafine mixed fiber web. As the heat treatment method, a known method such as a thermocompression bonding method using a heated embossing roll, an air through method using heated air, or a method using an infrared lamp can be used. By the heat treatment, the high melting point ultrafine fibers are fixed by fusion of the low melting point ultrafine fibers while maintaining the fiber form, to form a three-dimensional network structure. The non-woven fabric thus obtained has fine inter-fiber voids composed of ultrafine fibers having a fiber diameter of 20 μm or less, has a soft texture, is free of fluff, and has excellent properties of high strength. Have. Based on such excellent properties, the nonwoven fabric of the present invention can be used as a surface material for disposable diapers, dustproof clothing, masks, wiping cloths, air filters and the like.
【００１３】メルトブロー法で紡糸された極細混合繊維
からなり、１０℃以上の融点差がある高融点極細繊維と
低融点極細繊維との混合繊維が、混合繊維中に１０〜９
０重量％含有される低融点極細繊維の融着により高融点
極細繊維が固定されている本願発明の立体状成形物は、
上記の極細混合繊維ウエブあるいは上記の極細混合繊維
ウエブを熱処理して得られた不織布を加熱成形して得ら
れる。このようにして得られた立体成形体は、極細繊維
で構成された微細な繊維間空隙を有し、風合いが柔軟
で、毛羽立ちもなく、かつ高強度であるという優れた性
質と、高融点極細繊維が低融点極細繊維の融着により固
定された三次元網目構造により立体形状が崩れにくいと
いう特徴を有し、医療用マスク、防塵マスク、肩パッド
等の用途がある。本発明の不織布及び立体成形物は、エ
レクトレツト・フイルターとすることができる。エレク
トレツト・フイルターとする方法としては、極混合繊維
ウエブ、不織布、あるいはこれを加熱成形した成形物
を、電圧約１〜３０キロボルトの直流コロナ放電等で処
理する方法が用いられ、約１０〜４５ク−ロン／ｃｍ2
の表面電価密度を有するものが好ましい。The mixed fibers of the high melting point ultrafine fibers and the low melting point ultrafine fibers which are composed of the ultrafine mixed fibers spun by the melt blow method and have a melting point difference of 10 ° C. or more are 10 to 9 in the mixed fibers.
The three-dimensional molded article of the present invention in which the high melting point ultrafine fibers are fixed by fusion bonding of the low melting point ultrafine fibers contained in 0% by weight,
It can be obtained by heat-molding the above ultrafine mixed fiber web or the nonwoven fabric obtained by heat treating the above ultrafine mixed fiber web. The three-dimensional molded body thus obtained has fine inter-fiber voids composed of ultrafine fibers, has a soft texture, is free of fluff, and has high strength, and has an extremely high melting point. The three-dimensional network structure in which fibers are fixed by fusion of low melting ultrafine fibers has a characteristic that the three-dimensional shape is not easily broken, and is used for medical masks, dust masks, shoulder pads and the like. The nonwoven fabric and the three-dimensional molded article of the present invention can be used as an electret filter. As the method for preparing the electret filter, there is used a method in which a pole-mixed fiber web, a non-woven fabric, or a molded product obtained by heat molding the same is treated with a direct current corona discharge having a voltage of about 1 to 30 kilovolts, and the like. Coulomb / cm 2
Those having a surface charge density of are preferred.
【００１４】メルトブロー法で紡糸された極細混合繊維
からなり、１０℃以上の融点差がある高融点極細繊維と
低融点極細繊維との混合繊維が、混合繊維中に１０〜９
０重量％含有される低融点極細繊維の融着により高融点
極細繊維が固定されている本発明の筒状フィルターは、
前記のメルトブロー法で紡糸された極細混合繊維を、米
国特許第4,594,202号に記載されているように、回転し
ている通気性の心棒上に堆積させる方法、あるいは前記
の極細混合繊維ウエブあるいは不織布を、米国特許第
４，１００，００９号に記載されているように、ネット
コンベヤーで搬送しながら回転している心棒上に巻取る
ことにより得ることができる。極細混合繊維ウエブある
いは不織布の目付量は、３〜１０００ｇ／ｍ2 、好まし
くは４〜７００ｇ／ｍ2 が使用出来、後述の熱処理によ
り低融点極細繊維の融着による高融点極細繊維の固定が
確実にかつ均質に実現できることから目付け量が１００
ｇ／ｍ2以下であることが最も望ましい。The mixed fibers of the high melting point ultrafine fibers and the low melting point ultrafine fibers, which are composed of the ultrafine mixed fibers spun by the melt blow method and have a melting point difference of 10 ° C. or more, are 10 to 9 in the mixed fibers.
The tubular filter of the present invention in which the high melting point ultrafine fibers are fixed by fusion bonding of the low melting point ultrafine fibers contained in 0% by weight,
A method of depositing ultrafine mixed fibers spun by the meltblown method on a rotating breathable mandrel, as described in U.S. Pat.No. 4,594,202, or the ultrafine mixed fiber web or nonwoven fabric described above. , U.S. Pat. No. 4,100,009, and is wound on a rotating mandrel while being conveyed by a net conveyor. Basis weight of the ultrafine mixed fibers web or nonwoven fabric, 3~1000g / m 2, preferably 4~700g / m 2 can be used, ensuring a fixed refractory microfine fibers by fusion of the low melting point microfine fibers by the heat treatment described later Since it can be realized uniformly and uniformly, the basis weight is 100
Most preferably, it is not more than g / m 2 .
【００１５】いずれの方法においても、巻取りに際し極
細混合繊維の低融点極細繊維の軟化点と高融点極細繊維
の軟化点の間の範囲の温度で熱処理を行う。熱処理に
は、ウエブ又は不織布を加熱する方法、あるいは心棒上
に巻取られた極細混合繊維を加熱する方法がある。加熱
の方法としては、加熱エンボスロールによる熱圧着法、
加熱空気によるエアスルー法、あるいは赤外線ランプに
よる方法等の公知の方法が使用できる。これらの中で加
熱空気によるエアスルー法でウエブ又は不織布を加熱す
る方法は、ウエブの繊維秩序を乱すことがないので厚み
斑のないウエブを巻取ることができ、かつ加熱面全体を
均一に加熱することができるので、濾過精度等の品質の
安定した筒状フイルターが得られる。メルトブロー法で
紡糸された極細混合繊維を冷却させることなく回転して
いる通気性の心棒上に堆積させ巻き取る場合には、積極
的な加熱処理は行わなくても、その保有する自熱により
高融点極細繊維を熱接合することができる。このように
して得られた筒状フイルターは、極細混合繊維で構成さ
れているので濾過精度が高く、低融点極細繊維の融着に
より高融点極細繊維が固定されて三次元網目構造を作っ
ているので加熱滅菌処理、高温濾過、或は振動等によっ
ても濾過精度が変動せず、耐圧強度の大きな筒状フイル
ターが得られる。In either method, the heat treatment is performed at the time of winding at a temperature in the range between the softening point of the low melting ultrafine fibers of the ultrafine mixed fibers and the softening point of the high melting ultrafine fibers. The heat treatment includes a method of heating a web or a nonwoven fabric, or a method of heating an ultrafine mixed fiber wound on a mandrel. As a heating method, a thermocompression bonding method using a heating embossing roll,
A known method such as an air-through method using heated air or a method using an infrared lamp can be used. Among them, the method of heating a web or a nonwoven fabric by an air-through method using heated air does not disturb the fiber order of the web, so that a web without thickness unevenness can be wound and the entire heating surface is uniformly heated. Therefore, a cylindrical filter having stable quality such as filtration accuracy can be obtained. When ultra-fine mixed fibers spun by the melt-blowing method are piled up on a rotating breathable mandrel without being cooled and are wound up, even if no positive heat treatment is carried out, it is possible to keep high The melting point ultrafine fibers can be thermally bonded. The tubular filter thus obtained has a high filtration accuracy because it is composed of ultrafine mixed fibers, and the high melting ultrafine fibers are fixed by fusion of the low melting ultrafine fibers to form a three-dimensional network structure. Therefore, the filtration accuracy does not change even by heat sterilization, high-temperature filtration, vibration, etc., and a cylindrical filter with high pressure resistance can be obtained.
【００１６】極細混合繊維ウエブ又は不織布を筒状フイ
ルターに加工する際に、使用する極細混合繊維の繊維径
を順次変化させることにより、更に優れた筒状フイルタ
ーが得られる。例えば、極細混合繊維ウエブの巻取り開
始時の繊維径は小さく、巻取りが進行するにつれて順次
大きな繊維径とすると、フイルター内部の繊維間空隙の
大きさ（以下、濾過層の孔径ということがある）がフイ
ルターの濾過方向に沿って（フイルターの外側から内側
に向かって）順次小さくなる。このようなフイルター
は、粒度の異なる粒子をフイルターの表面から内部にか
けて粗粒子から細粒子へと分級して捕集することができ
るので、濾過ライフの長いフイルターとなる。また、極
細混合繊維ウエブの巻取り開始時の繊維径は大きく、巻
取りが進行するにつれて一旦小さな繊維径とした後再び
大きな繊維径とすると、上記の長い濾過ライフという特
徴の他に、更に耐圧強度が大きいという特徴を有するフ
イルターが得られる。When processing the ultrafine mixed fiber web or nonwoven fabric into a tubular filter, by further changing the fiber diameter of the ultrafine mixed fibers to be used, a more excellent tubular filter can be obtained. For example, if the fiber diameter at the start of winding the ultrafine mixed fiber web is small, and the fiber diameter is successively increased as the winding progresses, the size of the inter-fiber voids inside the filter (hereinafter sometimes referred to as the pore size of the filtration layer) ) Becomes smaller along the filtering direction of the filter (from the outside to the inside of the filter). In such a filter, particles having different particle sizes can be classified from coarse particles to fine particles from the surface to the inside of the filter and collected, so that the filter has a long filtration life. Further, the fiber diameter at the start of winding of the ultrafine mixed fiber web is large, and if the fiber diameter is once made smaller as the winding progresses and then made larger again, in addition to the above-mentioned characteristic of long filtration life, the pressure resistance is further increased. A filter having a characteristic of high strength can be obtained.
【００１７】いずれの場合においても、繊維径の変化が
大きいほど大きな効果が得られ、最大繊維径と最小繊維
径の比（最大繊維径／最小繊維径）が２倍以上であれば
効果が著しく、好ましくは３〜２０倍、より好ましくは
４〜１５倍である。。メルトブロー法で極細繊維を製造
するに際し、繊維径を変化させる手段としては、熱可塑
性樹脂の押し出し量を増加するかブローイング気流の流
速を落とすことにより繊維径を太くすることができ、逆
に熱可塑性樹脂の押し出し量を減少するかブローイング
気流の流速を増すことにより繊維径を細くすることがで
き、更に、これらの手段を組み合わせて用いることもで
きる。濾過層の孔径がフイルターの濾過方向に沿って順
次変化したフイルターを得る為の他の方法として、回転
心棒上に巻取りつつある極細混合繊維ウエブ又は不織布
に加える圧力を順次変化させる方法がある。例えば、極
細混合繊維ウエブの巻取り開始時の圧力は大きく、巻取
りが進行するにつれて順次小さな圧力とすると、濾過層
の孔径がフイルターの濾過方向に沿って（フイルターの
外側から内側に向かって）順次小さくなる。このように
して得られたフイルターは、前記の繊維径を小から大に
変化させて得られたフイルターと同様に、濾過ライフの
長いという特徴がある。In any case, the greater the change in fiber diameter, the greater the effect, and the greater the ratio of the maximum fiber diameter to the minimum fiber diameter (maximum fiber diameter / minimum fiber diameter), the more remarkable the effect. , Preferably 3 to 20 times, more preferably 4 to 15 times. . When manufacturing ultrafine fibers by the melt blow method, as a means of changing the fiber diameter, it is possible to increase the fiber diameter by increasing the extrusion amount of the thermoplastic resin or decreasing the flow velocity of the blowing air flow, and conversely the thermoplasticity. The fiber diameter can be reduced by reducing the amount of resin extruded or increasing the flow velocity of the blowing air flow, and these means can also be used in combination. As another method for obtaining a filter in which the pore size of the filtration layer is sequentially changed along the filtration direction of the filter, there is a method of sequentially changing the pressure applied to the ultrafine mixed fiber web or nonwoven fabric being wound on the rotating mandrel. For example, when the pressure at the start of winding the ultrafine mixed fiber web is large and the pressure is gradually reduced as the winding progresses, the pore diameter of the filtration layer is along the filtration direction of the filter (from the outside to the inside of the filter). It becomes smaller one after another. The filter thus obtained is characterized by a long filtration life, like the filter obtained by changing the fiber diameter from small to large.
【００１８】また、巻取り時に加える圧力を、小・大・
小の順に変化させることにより、濾過層の孔径がフイル
ターの濾過方向に沿って（フイルターの外側から内側に
向かって）順次大・小・大と変化したフイルターが得ら
れる。このようにして得られたフイルターは、前記の繊
維径を大・小・大と変化させて得られたフイルターと同
様に、濾過ライフの長くかつ耐圧強度が大きいという特
徴がある。いずれの場合においても、孔径の変化が大き
いほど大きな効果得られ、最大孔径と最小孔径の比（最
大孔径／最小孔径）が２倍以上であれば効果が著しく、
好ましくは３〜２０倍、より好ましくは４〜１５倍であ
る。繊維径または孔径の変化は、連続的であってもよ
く、段階的であってもよい。筒状フィルターの濾過方向
は、外から中のものが一般的であり、この場合、筒状フ
ィルター内側の繊維径が小さいまたは孔径が小さい。し
かし逆のものでもよく、この場合筒状フィルターの使用
後の処分が容易である。The pressure applied at the time of winding is small, large,
By changing the filter size in the order of small, a filter in which the pore size of the filter layer sequentially changes in the filtering direction of the filter (from the outer side to the inner side of the filter) is obtained. The filter thus obtained is characterized in that it has a long filtration life and a large pressure resistance strength, similar to the filter obtained by changing the fiber diameter between large, small and large. In any case, the greater the change in the pore size, the greater the effect, and the greater the ratio of the maximum pore size to the minimum pore size (maximum pore size / minimum pore size), the more remarkable the effect.
It is preferably 3 to 20 times, more preferably 4 to 15 times. The change in fiber diameter or pore diameter may be continuous or stepwise. The filtration direction of the tubular filter is generally from the outside to the inside, and in this case, the fiber diameter inside the tubular filter is small or the pore diameter is small. However, the reverse is also possible, in which case the tubular filter is easy to dispose after use.
【００１９】本発明の筒状フィルターは、エレクトレツ
ト・フイルターとすることができる。エレクトレツト・
フイルターとする方法としては、極細混合繊維ウエブ、
不織布、あるいはこれを巻取って製造した筒状フイルタ
ーを、電圧約１〜３０キロボルトの直流コロナ放電等で
処理する方法が用いられ、約１０〜４５ク−ロン／ｃｍ
2 の表面電価密度を有するものが好ましい。本発明の高
融点極細繊維は、高融点成分と低融点成分との複合繊維
であってもよく、この複合繊維により、より耐圧性があ
り、濾過精度が安定した筒状フィルターとなる。また同
様に低融点極細繊維も、高融点成分と低融点成分との複
合繊維であってもよく、これにより、より耐圧性があ
り、濾過精度が安定した筒状フィルターとななる。The tubular filter of the present invention may be an electret filter. Electret
As a method of making a filter, an ultrafine mixed fiber web,
A method of treating a non-woven fabric or a tubular filter produced by winding the non-woven fabric with a direct current corona discharge having a voltage of about 1 to 30 kilovolts is used.
Those having a surface charge density of 2 are preferred. The high melting point ultrafine fiber of the present invention may be a composite fiber of a high melting point component and a low melting point component, and by this composite fiber, a tubular filter having higher pressure resistance and stable filtration accuracy is obtained. Similarly, the low-melting point ultrafine fiber may be a composite fiber of a high-melting point component and a low-melting point component, whereby a tubular filter having higher pressure resistance and stable filtration accuracy can be obtained.
【００２０】本発明の筒状フィルターは、中芯がなくて
も充分耐圧性を有するが、中芯があってもよい。中芯の
断面形状は円形の他、楕円形、三角形、四角形、及びそ
れ以上の多角形でも構わない。本発明でいう筒状フィル
ターは、フィルターの横断面の形状が円形または楕円形
などの円筒状フィルター、あるいは横断面の形状が三角
または四角以上の多角形をした筒状フィルターである。
尚、中芯の形状が多角形の場合には、繊維ウエブを巻き
重ねるにつれフイルターの外形は多角形の形が円形に近
くなり易いが、フィルター特性への影響はない。本発明
の筒状フィルターは、電子機器用材料などの洗浄液用フ
ィルターや、除塵用エアフィルター、医薬品用に用る
水、食品、飲料、アルコール飲料等のプレフィルター等
として広く用いることができる。The tubular filter of the present invention has sufficient pressure resistance without a core, but may have a core. The cross-sectional shape of the core may be circular, oval, triangular, quadrangular, or polygonal. The tubular filter referred to in the present invention is a cylindrical filter whose cross-sectional shape is circular or elliptical, or a tubular filter whose cross-sectional shape is triangular or polygonal having four or more squares.
When the shape of the core is polygonal, the outer shape of the filter tends to be close to a circular shape as the fibrous web is wound, but this does not affect the filter characteristics. INDUSTRIAL APPLICABILITY The tubular filter of the present invention can be widely used as a filter for cleaning liquid such as a material for electronic devices, an air filter for dust removal, a prefilter for water for medicines, foods, beverages, alcoholic beverages and the like.
【００２１】[0021]
【実施例】次に本発明を実施例で更に具体的に説明す
る。なお実施例中に示した物性値は以下の方法で測定し
た。 ［濾過精度］ハウジングに、フィルター１本を取り付
け、３０リットルの水槽からポンプで循環通水する。流
量を毎分３０リットルに調整した後、水槽にケ−キ
（カーボランダム、＃４０００）を５ｇ添加する。ケ−
キ添加より１分後に濾過水を１００ミリリットル採取
し、メンブレンフィルター（粒径１μｍ以上の粒子を捕
集できるもの）で濾過し、メンブレンフィルター上に捕
集されたケ−キの粒度を、粒径毎の個数を測る粒度分布
測定機で測定し、最大流出粒径を濾過精度とした。EXAMPLES Next, the present invention will be described more specifically by way of examples. The physical property values shown in the examples were measured by the following methods. [Filtration accuracy] One filter is attached to the housing, and water is circulated through the pump from a 30-liter water tank. After adjusting the flow rate to 30 liters per minute, cake in the water tank.
Add 5 g of (Carborundum, # 4000). Case
100 ml of filtered water was collected 1 minute after the addition of the filter, filtered through a membrane filter (capable of collecting particles with a particle size of 1 μm or more), and the particle size of the cake collected on the membrane filter was measured as It measured with the particle size distribution measuring machine which measures the number of each, and the maximum outflow particle size was made into the filtration accuracy.
【００２２】［平均繊維径］ウエブまたはフィルター内
部より各々５箇所サンプリングし、各１枚電顕写真を撮
る。１枚の写真から任意の２０本の繊維径を計測し、計
１００本から平均繊維径を求めた。 ［孔径］バブルポイントテスタ−を使用し、ＡＳＴＭ−
Ｆ−３１６−８６に定める方法で最大孔径（μｍ）を求
めた。なお孔径は、回転する心棒に巻取りつつある不織
布をサンプリングして測定した。 ［濾過ライフ及び耐圧強度］ハウジングに、フィルター
１本を取り付け、３０リットルの水槽からポンプで循環
通水する。流量を毎分３０リツトルに設定した後、水槽
にケ−キ（ＪＩＳＺ８９０１の１６種：平均粒径３．５
μｍの重質炭酸カルシウム）を０．４ｇづつ１分間隔で
添加する。ケーキの添加をつづけながら通水循環を続
け、フイルターの入口と出口の水圧の差が３ｋｇ／ｃｍ
2 になつた時の時間（分）を濾過ライフとした。さらに
ケーキの添加と通水循環を続け、差圧が１０ｋｇ／ｃｍ
2になるか又はフイルタ−が変形した時点で終了する。
フイルタ−が変形した時の圧力（ｋｇ／ｃｍ2 ）を耐圧
強度とし、変形しないものは耐圧強度１０ｋｇ／ｃｍ2
以上とした。[Average fiber diameter] Five samples were taken from each of the web and the inside of the filter, and one electron micrograph was taken for each sample. The fiber diameter of any 20 fibers was measured from one photograph, and the average fiber diameter was calculated from a total of 100 fibers. [Pore size] Using a bubble point tester, ASTM-
The maximum pore diameter (μm) was determined by the method specified in F-316-86. The pore size was measured by sampling the non-woven fabric being wound around a rotating mandrel. [Filtration Life and Compressive Strength] One filter is attached to the housing, and water is circulated by a pump from a 30-liter water tank. After setting the flow rate to 30 liters per minute, the cake was placed in a water tank (16 types of JIS Z8901: average particle size 3.5).
.mu.m of ground calcium carbonate) is added in increments of 0.4 g at 1 minute intervals. Continuing water circulation while continuing to add cake, the difference in water pressure between the inlet and outlet of the filter is 3 kg / cm.
The time (minute) when reaching 2 was defined as the filtration life. The cake addition and water circulation continue, and the differential pressure is 10 kg / cm.
It ends when it becomes 2 or the filter is deformed.
The pressure (kg / cm 2 ) when the filter is deformed is the compressive strength, and the pressure that is not deformed is 10 kg / cm 2
That's it.
【００２３】〔実施例 １〕孔径が０．３ｍｍの高融点
繊維の紡糸孔と低融点繊維の紡糸孔が交互に一列に並ん
だ、総孔数５０１のメルトブロー用紡糸口金を用い、紡
糸温度を２８０℃とし、ＭＦＲが８０（ｇ／１０分、ａ
ｔ２３０℃）、融点１６５℃のポリプロピレンの吐出量
を６０ｇ／分、ＭＦＲが１２４（ｇ／１０分、ａｔ１９
０℃）、融点１２２℃の線状低密度ポリエチレンの吐出
量を６０ｇ／分、総吐出量を１２０ｇ／分とし、温度３
５０℃のブローイング空気の圧力を初期の３．１ｋｇ／
ｃｍ2・Ｇから末期の０．５ｋｇ／ｃｍ2・Ｇに連続的に
徐々に減少させる条件で紡糸し、吸引装置付きのコンベ
アネット上に吹き付けて、高融点極細繊維と低融点極細
繊維との混合比が５０／５０（重量）で目付量４９．０
ｇ／ｍ2の極細混合繊維ウエブを得た。この極細繊維ウ
エブには、繊維自身が保有する熱により、繊維間に弱い
接着が発生していた。[Example 1] Using a spinneret for melt-blowing with a total number of holes of 501, in which spinning holes of high-melting point fibers having a hole diameter of 0.3 mm and spinning holes of low-melting point fibers were alternately arranged in a row, the spinning temperature was changed. 280 ℃, MFR 80 (g / 10 minutes, a
t230 ° C.), melting point 165 ° C. polypropylene discharge rate 60 g / min, MFR 124 (g / 10 min, at19
0 ° C.), melting point 122 ° C., linear low density polyethylene discharge amount is 60 g / min, total discharge amount is 120 g / min, temperature 3
The blowing air pressure at 50 ° C was set to 3.1 kg /
Spinning under the condition that gradually decreases from cm 2 · G to 0.5 kg / cm 2 · G in the final stage, and spraying on a conveyor net with a suction device to obtain high melting point ultrafine fibers and low melting point ultrafine fibers. Mixing ratio is 50/50 (weight) and basis weight is 49.0
An ultrafine mixed fiber web of g / m 2 was obtained. In this ultrafine fiber web, weak adhesion occurs between the fibers due to the heat of the fibers themselves.
【００２４】この極細混合繊維ウエブを速度１５ｍ／
分、雰囲気温度１４０℃の条件のエアスルー加工機で加
熱し、ただちに外径３０ｍｍの金属製心棒上に巻取り、
室温に放置して冷後した。冷却後、心棒を抜き取り、残
った繊維成形物を切断して、外径６０ｍｍ、内径３０ｍ
ｍ、長さ２５０ｍｍの筒状フィルターを得た。紡糸中の
極細混合繊維ウエブからサンプリングした試料を測定し
た結果、平均繊維径はフイルターの内側表面で１．１μ
ｍ、内側から５ｍｍで１．９μｍ、内側から１０ｍｍで
３．７μｍ、外側表面で８．１μｍであった。この円筒
状フィルターは、低融点極細繊維の融着により高融点極
細繊維が接着され、三次元網状構造が形成されていた。
このフイルターの最大孔径はフイルターの内側で１２μ
ｍ、外側表面で７５μｍであった。このフィルターの濾
過性能を測定したところ、耐圧強度は７．４ｋｇ／ｃｍ
2、濾過精度は２．５μｍ、濾過ライフは４８分であ
り、濾過水に泡立ちのない良好なものであった。The speed of this ultrafine mixed fiber web is 15 m /
Min, heated with an air through machine with an ambient temperature of 140 ° C, and immediately wound up on a metal mandrel with an outer diameter of 30 mm,
It was left at room temperature and cooled. After cooling, pull out the mandrel and cut the remaining fiber molded product to an outer diameter of 60 mm and an inner diameter of 30 m.
A cylindrical filter having a length of m and a length of 250 mm was obtained. As a result of measuring the sample sampled from the ultrafine mixed fiber web during spinning, the average fiber diameter was 1.1 μm on the inner surface of the filter.
m, 5 mm from the inside was 1.9 μm, 10 mm from the inside was 3.7 μm, and the outside surface was 8.1 μm. In this cylindrical filter, the high melting point ultrafine fibers were bonded by fusion of the low melting point ultrafine fibers to form a three-dimensional network structure.
The maximum hole diameter of this filter is 12μ inside the filter.
m, 75 μm on the outer surface. When the filtration performance of this filter was measured, the pressure resistance was 7.4 kg / cm.
2 , the filtration accuracy was 2.5 μm, the filtration life was 48 minutes, and the filtered water was good with no bubbles.
【００２５】〔実施例 ２〕実施例１で用いた紡糸口金
を用い、紡糸温度を２８０℃、固有粘度０．６１、融点
２５２℃のポリエステルの吐出量を３６ｇ／分、前記実
施例１で用いたものと同一の線状低密度ポリエチレンの
吐出量を８４ｇ／分、総吐出量を１２０ｇ／分とし、温
度４００℃のブローイング空気の圧力を、初期の２．８
ｋｇ／ｃｍ2・Ｇから末期の０．４ｋｇ／ｃｍ2・Ｇに連
続的に徐々に減少させる条件で紡糸し、吸引装置付きの
コンベアネット上に吹き付けて、高融点極細繊維と低融
点極細繊維との混合比が３０／７０（重量）で目付量５
１．０ｇ／ｍ2の極細混合繊維ウエブを得た。この極細
繊維ウエブには、繊維自身が保有する熱により、繊維間
に弱い接着が発生していた。この極細混合繊維ウエブを
実施例１と同様に加熱し、巻取って、筒フイルターを得
た。この極細混合繊維ウエブからサンプリングした試料
を測定した結果、平均繊維径はフイルターの内側表面で
１．８μｍであり、厚み方向に暫増し、外側表面で９．
２μｍであった。この筒状フィルターは、低融点極細繊
維の融着により高融点極細繊維が接着され、三次元網状
構造が形成されていた。このフイルターの最大孔径はフ
イルターの内側で２０μｍ、外側表面で８４μｍであっ
た。このフィルターの濾過性能を測定したところ、耐圧
強度は７．４ｋｇ／ｃｍ2、濾過精度は４．５μｍ、濾
過ライフは６７分であり、濾過水に泡立ちのない良好な
ものであった。Example 2 Using the spinneret used in Example 1, a spinning temperature of 280 ° C., an intrinsic viscosity of 0.61, a melting point of 252 ° C., and a polyester discharge rate of 36 g / min were used. The discharge amount of the same linear low-density polyethylene as that used in the above is 84 g / min, the total discharge amount is 120 g / min, and the pressure of blowing air at a temperature of 400 ° C. is 2.8 at the initial stage.
It spun under conditions which continuously and gradually decreases from kg / cm 2 · G to 0.4kg / cm 2 · G of the end, by blowing on the conveyor net with a suction device, a high melting point microfine fibers and low melting point microfine fibers With a mixing ratio of 30/70 (weight) and a basis weight of 5
An ultrafine mixed fiber web of 1.0 g / m 2 was obtained. In this ultrafine fiber web, weak adhesion occurs between the fibers due to the heat of the fibers themselves. This ultrafine mixed fiber web was heated and wound in the same manner as in Example 1 to obtain a tubular filter. As a result of measuring a sample sampled from this ultrafine mixed fiber web, the average fiber diameter was 1.8 μm on the inner surface of the filter, which gradually increased in the thickness direction, and was increased on the outer surface by 9.
It was 2 μm. In this tubular filter, the high melting point ultrafine fibers were adhered by fusion bonding of the low melting point ultrafine fibers to form a three-dimensional network structure. The maximum pore size of this filter was 20 μm on the inside of the filter and 84 μm on the outside surface. When the filtration performance of this filter was measured, the pressure resistance was 7.4 kg / cm 2 , the filtration accuracy was 4.5 μm, the filtration life was 67 minutes, and the filtered water was good without bubbling.
【００２６】〔実施例 ３〕固有粘度０．６１、融点２
５３℃のポリエステルの吐出量を４８ｇ／分、固有粘度
０．５５、融点２０５℃のエチレングリコールテレフタ
レート・イソフタレート共重合体の吐出量を７２ｇ／
分、総吐出量を１２０ｇ／分とし、紡糸温度を３００℃
とした以外は実施例２と同じ方法で紡糸して、高融点極
細繊維と低融点極細繊維との混合比が４０／６０（重
量）の極細混合繊維ウエブを得た。この極細繊維ウエブ
には、繊維自身が保有する熱により、繊維間に弱い接着
が発生していた。吸引機構を備え、１０ｍ／分で回転し
ている、外径３０ｍｍの、通気性の金属製中芯に、紡糸
口金から吐き出される上記の極細混合繊維ウエブを直接
吹き付け、外径が６２ｍｍとなるまで巻取り、室温に放
冷後中芯を抜き取り、長さを２５０ｍｍに切断し筒状フ
イルターを得た。巻取りに際し、遠赤外ヒータにより巻
取り物の雰囲気温度を１４０℃に加熱し、極細混合繊維
ウエブの接着性を良くした。紡糸中のウエブからサンプ
リングした試料を測定した結果、２種類のポリエステル
の紡糸孔当たりの吐出量が異なるので、フイルターは内
層、外層共に太繊度糸と細繊度糸が混在したものであっ
た。得られた筒状フィルターの平均繊維径は内側表面で
２．０μｍであり、厚み方向に暫増し、外側表面で９．
５μｍであった。このフィルターの濾過性能を測定した
ところ、耐圧強度は８．４ｋｇ／ｃｍ2、濾過精度は
３．３μｍ、濾過ライフは４３分であり、濾過水に泡立
ちのない良好なものであった。[Example 3] Intrinsic viscosity 0.61, melting point 2
The discharge amount of polyester at 53 ° C is 48 g / min, the discharge amount of ethylene glycol terephthalate / isophthalate copolymer having an intrinsic viscosity of 0.55 and a melting point of 205 ° C is 72 g / min.
Min, total discharge rate is 120g / min, spinning temperature is 300 ℃
Spinning was performed in the same manner as in Example 2 except that the above was used to obtain an ultrafine mixed fiber web having a mixing ratio of the high melting ultrafine fibers and the low melting ultrafine fibers of 40/60 (weight). In this ultrafine fiber web, weak adhesion occurs between the fibers due to the heat of the fibers themselves. Equipped with a suction mechanism, rotating at 10 m / min, and having an outer diameter of 30 mm, an air-permeable metal core was directly sprayed with the ultrafine mixed fiber web discharged from the spinneret until the outer diameter reached 62 mm. After winding and allowing to cool to room temperature, the core was taken out and cut into a length of 250 mm to obtain a tubular filter. At the time of winding, the ambient temperature of the wound material was heated to 140 ° C. by a far infrared heater to improve the adhesiveness of the ultrafine mixed fiber web. As a result of measuring the sample sampled from the web during spinning, the discharge amounts of the two types of polyesters per spinning hole are different, so that the filter was a mixture of large fineness yarns and fine fineness yarns in both the inner layer and the outer layer. The average fiber diameter of the obtained tubular filter was 2.0 μm on the inner surface, was gradually increased in the thickness direction, and was 9. on the outer surface.
It was 5 μm. When the filtration performance of this filter was measured, the pressure resistance was 8.4 kg / cm 2 , the filtration accuracy was 3.3 μm, the filtration life was 43 minutes, and the filtration water was good without bubbling.
【００２７】〔実施例 ４〕実施例１で用いた紡糸口金
を用い、紡糸温度を２９０℃、ブローイング空気の温度
３３０℃、圧力１．９ｋｇ／ｃｍ2・Ｇの条件で、ＭＦ
Ｒが８０（ｇ／１０分、ａｔ２３０℃）、融点１６５℃
のポリプロピレンと、ＭＦＲが６５（ｇ／１０分、ａｔ
２３０℃）、融点１３８℃のプロピレン・エチレン・ブ
テン−１ランダムコーポリマーとを等量吐出させなが
ら、総吐出量を初期の１００ｇ／分から末期の２００ｇ
／分に次第に増加させて紡糸し、吸引装置付きのコンベ
アネット上に吹き付けて、高融点極細繊維と低融点極細
繊維との混合比が５０／５０（重量）の極細混合繊維ウ
エブを得た。この極細混合繊維ウエブには、繊維自身が
保有する熱により、繊維間に弱い接着が発生していた。
この極細混合繊維ウエブを速度１５ｍ／分、雰囲気温度
１４５℃の条件のエアスルー加工機で加熱し、ただち
に、一辺が１５ｍｍの正六角形の金属製中芯に巻取り、
室温に放冷後、中芯を抜き取って長さ２５０ｍｍに切断
して筒状フイルターを得た。得られた筒状フィルターの
外径は最大のところが６０ｍｍ、最小は５２ｍｍで、概
ね円形に近いものになった。紡糸中のウエブからサンプ
リングした試料を測定した結果、平均繊維径はフイルタ
ーの内側表面で０．９μｍであり、厚み方向に暫増し、
外側表面で７．７μｍであった。このフィルターの濾過
性能を測定したところ、耐圧強度は７.２ｋｇ／ｃｍ2、
濾過精度は２．１μｍ、濾過ライフは４０分であり、濾
過水に泡立ちのない良好なものであった。[Example 4] Using the spinneret used in Example 1, the spinning temperature was 290 ° C, the blowing air temperature was 330 ° C, and the pressure was 1.9 kg / cm 2 · G.
R is 80 (g / 10 minutes, at 230 ° C), melting point 165 ° C
Polypropylene and MFR of 65 (g / 10 minutes, at
230 ℃), melting point 138 ℃ propylene · ethylene · butene-1 random copolymer while discharging the same amount, the total discharge amount from the initial 100g / min to the final stage 200g
The fiber was gradually spun at a speed of 1 / min, spun, and sprayed onto a conveyor net with a suction device to obtain an ultrafine mixed fiber web in which the mixing ratio of the high melting ultrafine fibers and the low melting ultrafine fibers was 50/50 (weight). In this ultrafine mixed fiber web, the heat retained by the fibers themselves causes weak adhesion between the fibers.
This ultrafine mixed fiber web was heated by an air-through processing machine under the conditions of a speed of 15 m / min and an atmospheric temperature of 145 ° C., and immediately wound on a regular hexagonal metal core having a side of 15 mm,
After allowing to cool to room temperature, the core was taken out and cut into a length of 250 mm to obtain a cylindrical filter. The outer diameter of the obtained cylindrical filter was 60 mm at the maximum and 52 mm at the minimum, and was almost circular. As a result of measuring the sample sampled from the web being spun, the average fiber diameter is 0.9 μm on the inner surface of the filter, and the average fiber diameter is gradually increased in the thickness direction.
It was 7.7 μm on the outer surface. When the filtration performance of this filter was measured, the compressive strength was 7.2 kg / cm 2 ,
The filtration accuracy was 2.1 μm, the filtration life was 40 minutes, and the filtered water was good with no bubbles.
【００２８】［実施例５］高融点繊維を吐出するための
紡糸孔３５１孔と低融点繊維を吐出するための紡糸孔１
５０孔とが均等に分配された、孔径０．３ｍｍ、総孔数
５０１の混合繊維型メルトブロ−紡糸口金を用い、紡糸
温度は２８５℃とし、ＭＦＲ１２２（ｇ／１０分、２３
０℃）、融点１６５℃のポリプロピレンの吐出量を８４
ｇ／分／３５１孔、ＭＦＲ６５（ｇ／１０分、２３０
℃）、融点１３８℃のプロピレン・エチレン・ブテン−
１ランダムコポリマ−の吐出量を３６ｇ／分／１５０
孔、総吐出量を１２０ｇ／分とし、温度が３６０℃のブ
ローイング空気の圧力を初期の３．４ｋｇ／ｃｍ2・Ｇ
から末期の０．７ｋｇ／ｃｍ2・Ｇに連続的に減少させ
る条件で紡糸し、吸引装置付きのコンベアネット上に吹
き付けて、高融点極細繊維と低融点極細繊維との混合比
が７０／３０（重量）で目付量が５０ｇ／ｍ2の極細混
合繊維ウエブを得た。この極細繊維ウエブには、繊維自
身が保有する熱により、繊維間に弱い接着が発生してい
た。[Embodiment 5] Spinning hole 351 for discharging high melting point fibers and spinning hole 1 for discharging low melting point fibers
Using a mixed fiber type melt-blow spinneret with a hole diameter of 0.3 mm and a total number of holes of 501, which was evenly distributed with 50 holes, the spinning temperature was 285 ° C., and MFR 122 (g / 10 min, 23
0 ° C), melting point 165 ° C polypropylene discharge amount 84
g / min / 351 holes, MFR65 (g / 10min, 230
℃), melting point 138 ℃ propylene-ethylene-butene-
Discharge amount of 1 random copolymer is 36g / min / 150
The amount of holes and total discharge is 120 g / min, and the pressure of blowing air at a temperature of 360 ° C is the initial 3.4 kg / cm 2 · G.
From the end to 0.7 kg / cm 2 · G in the final stage, it is spun under the condition that it is continuously reduced and sprayed onto a conveyor net with a suction device, and the mixing ratio of the high melting ultrafine fibers and the low melting ultrafine fibers is 70/30. An ultrafine mixed fiber web having a basis weight (weight) of 50 g / m 2 was obtained. In this ultrafine fiber web, weak adhesion occurs between the fibers due to the heat of the fibers themselves.
【００２９】この極細混合繊維ウエブを速度１５ｍ／
分、雰囲気温度１４０℃の条件のエアスルー加工機で加
熱し、ポリプロピレン繊維がプロピレン・エチレン・ブ
テン−１ランダムコポリマ−の熱融着により固定された
不織布を得た。この不織布を、実施例１と同様にエアス
ルー加工機で加熱し、ただちに外径３０ｍｍの金属製心
棒上に巻取り、室温に放置して冷後した。冷却後、心棒
を抜き取り、残った繊維成形物を切断して、外径６０ｍ
ｍ、内径３０ｍｍ、長さ２５０ｍｍの筒状フィルターを
得た。紡糸中のウエブからサンプリングした試料を測定
した結果、２種類の樹脂の紡糸孔当りの吐出量が同じで
あるので高融点極細繊維と低融点極細繊維の繊維径はほ
ぼ等しく、平均繊維径はフイルターの内側表面で０．８
μｍ、内側から７ｍｍで２．２μｍ、外側表面で７．４
μｍであつた。このフイルターの最大孔径はフイルター
の内側で７μｍ、厚み方向に暫増し、外側表面では６２
μｍであった。このフィルターの濾過性能を測定したと
ころ、耐圧強度は６．５ｋｇ／ｃｍ2、濾過精度は１．
１μｍ、濾過ライフは４８分であり、濾過水に泡立ちの
ない良好なものであった。A speed of 15 m /
For a minute, it was heated by an air-through processing machine under the conditions of an ambient temperature of 140 ° C. to obtain a nonwoven fabric in which polypropylene fibers were fixed by thermal fusion of propylene / ethylene / butene-1 random copolymer. This non-woven fabric was heated by an air-through processing machine in the same manner as in Example 1, immediately wound on a metal mandrel having an outer diameter of 30 mm, left at room temperature and cooled. After cooling, pull out the mandrel and cut the remaining fiber molding to obtain an outer diameter of 60 m.
A cylindrical filter having a diameter of m, an inner diameter of 30 mm and a length of 250 mm was obtained. As a result of measuring the sample sampled from the web being spun, since the two resins have the same discharge amount per spinning hole, the high melting ultrafine fibers and the low melting ultrafine fibers have almost the same fiber diameter, and the average fiber diameter is 0.8 on the inner surface of
μm, 2.2 mm at 7 mm from inside, 7.4 at outside surface
μm. The maximum pore diameter of this filter is 7 μm inside the filter, and it increases temporarily in the thickness direction.
was μm. When the filtration performance of this filter was measured, the pressure resistance was 6.5 kg / cm 2 , and the filtration accuracy was 1.
The filter life was 1 μm, the filtration life was 48 minutes, and the filter water was good with no bubbles.
【００３０】［実施例６］実施例５で使用したものと同
じ紡糸口金及び２種類の熱可塑性樹脂を用い、紡糸温度
は２８５℃とし、プロピレン・エチレン・ブテン−１ラ
ンダムコポリマ−の吐出量を８４ｇ／分／３５１孔、ポ
リプロピレンの吐出量を３６ｇ／分／１５０孔、総吐出
量を１２０ｇ／分とし、ブローイング空気の条件を温度
が３４０℃で圧力が初期の２．９ｋｇ／ｃｍ2・Ｇ から
末期の１．２ｋｇ／ｃｍ2・Ｇに連続的に減少させる条
件で紡糸し、吸引装置付きのコンベアネット上に吹き付
けて、高融点極細繊維と低融点極細繊維との混合比が３
０／７０（重量）で目付量が５０ｇ／ｍ2の極細混合繊
維ウエブを得た。このウエブを実施例５と同様に処理し
てし、外径６０ｍｍ、内径３０ｍｍ、長さ２５０ｍｍの
筒状フィルターを得た。紡糸中のウエブからサンプリン
グした試料を測定した結果、高融点極細繊維と低融点極
細繊維の繊維径には多少のバラツキが認められるがほぼ
等しく、平均繊維径はフイルターの内側表面で１．４μ
ｍ、内側から７ｍｍで２．９μｍ、外側表面で４．４μ
ｍであつた。このフィルターの濾過性能を測定したとこ
ろ、耐圧強度は６．７ｋｇ／ｃｍ2、濾過精度は２．０
μｍ、濾過ライフは３８分であり、濾過水に泡立ちのな
い良好なものであった。Example 6 The same spinneret and two kinds of thermoplastic resins as used in Example 5 were used, the spinning temperature was 285 ° C., and the discharge amount of propylene / ethylene / butene-1 random copolymer was set. 84g / min / 351 holes, polypropylene discharge amount is 36g / min / 150 holes, total discharge amount is 120g / min, blowing air conditions are temperature 340 ° C and initial pressure 2.9kg / cm 2 · G To 1.2 kg / cm 2 · G at the end of the period, spun under conditions that continuously reduce and spray onto a conveyor net with a suction device, and the mixing ratio of high melting ultrafine fibers and low melting ultrafine fibers is 3
An ultrafine mixed fiber web having a weight per unit area of 0/70 (weight) of 50 g / m 2 was obtained. This web was treated in the same manner as in Example 5 to obtain a cylindrical filter having an outer diameter of 60 mm, an inner diameter of 30 mm and a length of 250 mm. As a result of measuring the sample sampled from the web being spun, there is some variation in the fiber diameters of the high melting ultrafine fibers and the low melting ultrafine fibers, but they are almost equal, and the average fiber diameter is 1.4μ on the inner surface of the filter.
m, 7 mm from inside, 2.9 μm, outside surface 4.4 μm
It was m. When the filtration performance of this filter was measured, the pressure resistance was 6.7 kg / cm 2 , and the filtration accuracy was 2.0.
The filter life was 38 μm and the filter life was 38 minutes.
【００３１】［実施例７］前記実施例１においてブロー
イング空気の圧力を１．７ｋｇ／ｃｍ2・Ｇで一定とし
た以外は、実施例１と同一の条件で、外径６０ｍｍ，内
径３０ｍｍ、長さ２５０ｍｍの円筒状フイルタ−を得
た。紡糸中のウエブからサンプリングした試料を測定し
た結果、２種類の樹脂の紡糸孔当りの吐出量が同じであ
るので高融点極細繊維と低融点極細繊維の繊維径はほぼ
等しく、平均繊維径はフイルターの全層において２．２
μｍであつた。このフィルターの濾過性能を測定したと
ころ、耐圧強度は７．０ｋｇ／ｃｍ2、濾過精度は４．
１μｍ、濾過ライフは２２分であり、濾過水に泡立ちの
ない良好なものであった。[Embodiment 7] An outer diameter of 60 mm, an inner diameter of 30 mm, and a length of 60 mm were obtained under the same conditions as in Embodiment 1 except that the pressure of the blowing air was constant at 1.7 kg / cm 2 · G. A 250 mm thick cylindrical filter was obtained. As a result of measuring the sample sampled from the web being spun, since the two resins have the same discharge amount per spinning hole, the high melting ultrafine fibers and the low melting ultrafine fibers have almost the same fiber diameter, and the average fiber diameter is 2.2 in all layers of
μm. When the filtration performance of this filter was measured, the pressure resistance was 7.0 kg / cm 2 , and the filtration accuracy was 4.
The filter life was 1 μm, the filtration life was 22 minutes, and the filtered water was good with no bubbles.
【００３２】［実施例８］前記実施例１においてブロー
イング空気の圧力を１．２ｋｇ／ｃｍ2・Ｇで一定とし
た以外は、実施例１と同一の条件で、外径６０ｍｍ，内
径３０ｍｍ、長さ２５０ｍｍの筒状フイルタ−を得た。
紡糸中のウエブからサンプリングした試料を測定した結
果、２種類の樹脂の紡糸孔当りの吐出量が同じであるの
で高融点極細繊維と低融点極細繊維の繊維径はほぼ等し
く、平均繊維径はフイルターの全層において６．０μｍ
であつた。このフィルターの濾過性能を測定したとこ
ろ、耐圧強度は７．６ｋｇ／ｃｍ2、濾過精度は５．８
μｍ、濾過ライフは３５分であり、濾過水に泡立ちのな
い良好なものであった。[Embodiment 8] The outer diameter is 60 mm, the inner diameter is 30 mm, and the length is the same as in Embodiment 1 except that the blowing air pressure is constant at 1.2 kg / cm 2 · G. A cylindrical filter having a size of 250 mm was obtained.
As a result of measuring the sample sampled from the web being spun, since the two resins have the same discharge amount per spinning hole, the high melting ultrafine fibers and the low melting ultrafine fibers have almost the same fiber diameter, and the average fiber diameter is 6.0 μm in all layers of
It was. When the filtration performance of this filter was measured, the pressure resistance was 7.6 kg / cm 2 , and the filtration accuracy was 5.8.
The filter life was 35 μm and the filtration life was 35 minutes.
【００３３】［実施例９］実施例１で用いた紡糸口金を
用い、ＭＦＲが８０（ｇ／１０分、ａｔ２３０℃）、融
点１６５℃のポリプロピレンを紡糸温度２９０℃、吐出
量６０ｇ／分で、ＭＦＲが６５（ｇ／１０分、ａｔ２３
０℃）、融点１３８℃のプロピレン・エチレン・ブテン
−１ランダムコーポリマーを紡糸温度３１０℃、吐出量
６０ｇ／分で、温度３４０℃のブローイング空気の圧力
を初期の０．４ｋｇ／ｃｍ2・Ｇから、中期には３．０
ｋｇ／ｃｍ2・Ｇ、末期には再び０．４ｋｇ／ｃｍ2・Ｇ
へと連続的に変化させて紡糸し、吸引装置付きのコンベ
アネット上に吹き付けて、高融点極細繊維と低融点極細
繊維との混合比が５０／５０（重量）の極細混合繊維ウ
エブを得た。この極細混合繊維ウエブには、繊維自身が
保有する熱により、繊維間に弱い接着が発生していた。
この極細混合繊維ウエブを速度１２ｍ／分、雰囲気温度
１４５℃の条件のエアスルー加工機で加熱し、ただちに
外径３０ｍｍの金属製心棒上に巻取り、室温に放置して
冷後した。冷却後、心棒を抜き取り、残った繊維成形物
を切断して、外径６０ｍｍ、内径３０ｍｍ、長さ２５０
ｍｍの筒状フィルターを得た。紡糸中の極細混合繊維ウ
エブからサンプリングした試料を測定した結果、平均繊
維径はフイルターの内側表面で８．２μｍ、内側から８
ｍｍで０．８μｍ、外側表面で８．３μｍであった。こ
の円筒状フィルターは、低融点極細繊維の融着により高
融点極細繊維が接着され、三次元網状構造が形成されて
いた。このフイルターの最大孔径はフイルターの内側で
８１μｍ、内側から８ｍｍで１５μｍ、外側表面で７９
μｍであった。このフィルターの濾過性能を測定したと
ころ、耐圧強度は８．８ｋｇ／ｃｍ2、濾過精度は１．
６μｍ、濾過ライフは４９分であり、濾過水に泡立ちの
ない良好なものであった。Example 9 Using the spinneret used in Example 1, polypropylene having an MFR of 80 (g / 10 minutes, at 230 ° C.) and a melting point of 165 ° C. was used at a spinning temperature of 290 ° C. and a discharge rate of 60 g / min. MFR is 65 (g / 10 minutes, at23
Propylene / ethylene / butene-1 random copolymer having a melting point of 138 ° C and a spinning temperature of 310 ° C, a discharge rate of 60 g / min, and a blowing air pressure of 340 ° C at an initial 0.4 kg / cm 2 · G. From 3.0 to mid-term
kg / cm 2 · G, again at the end 0.4kg / cm 2 · G
To a conveyor net with a suction device to obtain an ultrafine mixed fiber web having a mixing ratio of high melting point ultrafine fibers and low melting point ultrafine fibers of 50/50 (weight). . In this ultrafine mixed fiber web, the heat retained by the fibers themselves causes weak adhesion between the fibers.
This ultrafine mixed fiber web was heated with an air-through processing machine under the conditions of a speed of 12 m / min and an ambient temperature of 145 ° C., immediately wound up on a metal mandrel having an outer diameter of 30 mm, left at room temperature and cooled. After cooling, pull out the mandrel, cut the remaining fiber molding, outer diameter 60 mm, inner diameter 30 mm, length 250
A cylindrical filter of mm was obtained. As a result of measuring the sample sampled from the ultrafine mixed fiber web during spinning, the average fiber diameter was 8.2 μm on the inner surface of the filter and 8 from the inner side.
mm was 0.8 μm, and the outer surface was 8.3 μm. In this cylindrical filter, the high melting point ultrafine fibers were bonded by fusion of the low melting point ultrafine fibers to form a three-dimensional network structure. The maximum pore size of this filter is 81 μm inside the filter, 15 μm 8 mm from the inside and 79 μm outside.
was μm. When the filtration performance of this filter was measured, the pressure resistance was 8.8 kg / cm 2 , and the filtration accuracy was 1.
It was 6 μm, the filtration life was 49 minutes, and it was a good one with no bubbles in the filtered water.
【００３４】［実施例１０］前記実施例１においてブロ
ーイング空気の圧力を１．７ｋｇ／ｃｍ2・Ｇで一定と
した以外は、実施例１と同一の条件で紡糸し、吸引装置
付きのコンベアネット上に吹き付けて、平均繊維径がい
ずれも２．２μｍの高融点極細繊維と低融点極細繊維と
の混合比が５０／５０（重量）で目付量４９．０ｇ／ｍ
2の極細混合繊維ウエブを得た。この極細繊維ウエブに
は、繊維自身が保有する熱により、繊維間に弱い接着が
発生していた。このウエブを２枚積層し、温度１４０℃
の熱風乾燥機を用いて５分間加熱し、肩パッド用の金型
を用いてコールドプレスして立体成形体を作成した。こ
の立体成形体は毛羽や皺が無く、適度の柔軟性があって
肩パッドとして好ましく使用できた。[Embodiment 10] A conveyor net with a suction device, which was spun under the same conditions as in Embodiment 1, except that the pressure of the blowing air was constant at 1.7 kg / cm 2 · G. It is sprayed on, and the mixing ratio of the high melting point ultrafine fibers and the low melting point ultrafine fibers each having an average fiber diameter of 2.2 μm is 50/50 (weight) and the basis weight is 49.0 g / m.
An ultrafine mixed fiber web of 2 was obtained. In this ultrafine fiber web, weak adhesion occurs between the fibers due to the heat of the fibers themselves. Two pieces of this web are laminated and the temperature is 140 ° C.
Was heated for 5 minutes using the hot air drier described above, and cold pressed using a die for a shoulder pad to prepare a three-dimensional molded body. This three-dimensional molded body was free of fluff and wrinkles, had appropriate flexibility, and was preferably used as a shoulder pad.
【００３５】［実施例１１］高融点繊維を吐出するため
の紡糸孔２００孔、低融点繊維を吐出するための紡糸孔
２００孔、及び並列型複合繊維を吐出するための紡糸孔
１０１孔とが均等に分散された、孔径０．３ｍｍ、総孔
数５０１の混合繊維型メルトブロ−紡糸口金を用い、紡
糸温度は２７０℃とし、ＭＦＲ１２２（ｇ／１０分、２
３０℃）、融点１６５℃のポリプロピレンの吐出量を４
８ｇ／分／２００孔、ＭＦＲ６５（ｇ／１０分、２３０
℃）、融点１３８℃のプロピレン・エチレン・ブテン−
１ランダムコポリマ−の吐出量を４８ｇ／分／２０００
孔、上記２種類のポリマーの等量からなる複合繊維の吐
出量を２４ｇ／分／１０１孔、総吐出量を１２０ｇ／分
とし、温度が３２０℃のブローイング空気の圧力を初期
の０．６ｋｇ／ｃｍ2・Ｇから、中期には３．５ｋｇ／
ｃｍ2・Ｇ、末期の０．６ｋｇ／ｃｍ2・Ｇに連続的に減
少させる条件で紡糸し、吸引装置付きのコンベアネット
上に吹き付けて、目付量が５０ｇ／ｍ2の極細混合繊維
ウエブを得た。この極細繊維ウエブには、繊維自身が保
有する熱により、繊維間に弱い接着が発生していた。[Embodiment 11] 200 spinning holes for discharging high melting point fibers, 200 spinning holes for discharging low melting point fibers, and 101 spinning holes for discharging side-by-side composite fibers. Using a mixed fiber type melt-blow spinneret having a hole diameter of 0.3 mm and a total number of holes of 501, which was uniformly dispersed, the spinning temperature was 270 ° C., and MFR122 (g / 10 minutes, 2
30 ° C), melting point 165 ° C polypropylene discharge amount 4
8g / min / 200 holes, MFR65 (g / 10min, 230
℃), melting point 138 ℃ propylene-ethylene-butene-
Discharge rate of 1 random copolymer is 48g / min / 2000
The discharge amount of the holes, the composite fiber composed of the same amount of the above two kinds of polymers is 24 g / min / 101 holes, the total discharge amount is 120 g / min, and the pressure of the blowing air at a temperature of 320 ° C. is 0.6 kg / From cm 2 · G to 3.5 kg /
cm 2 · G, spinning at a final stage of 0.6 kg / cm 2 · G under conditions of continuous reduction, and spraying onto a conveyor net with a suction device to produce an ultrafine mixed fiber web with a basis weight of 50 g / m 2. Obtained. In this ultrafine fiber web, weak adhesion occurs between the fibers due to the heat of the fibers themselves.
【００３６】この極細混合繊維ウエブを速度１５ｍ／
分、雰囲気温度１４６℃の条件のエアスルー加工機で加
熱し、ポリプロピレン繊維がプロピレン・エチレン・ブ
テン−１ランダムコポリマ−の熱融着により固定された
不織布を得た。この不織布を、実施例１と同様にエアス
ルー加工機で加熱し、ただちに外径３０ｍｍの金属製心
棒上に巻取り、室温に放置して冷却した。冷却後、心棒
を抜き取り、残った繊維成形物を切断して、外径６０ｍ
ｍ、内径３０ｍｍ、長さ２５０ｍｍの筒状フィルターを
作製した。紡糸中のウエブからサンプリングした試料を
測定した結果、平均繊維径はフイルターの内側表面で１
０．２μｍ、内側から７ｍｍで０．８μｍ、外側表面で
９．８μｍであつた。このフィルターの濾過性能を測定
したところ、耐圧強度は７．０ｋｇ／ｃｍ2、濾過精度
は１．１μｍ、濾過ライフは４０分であり、濾過水に泡
立ちのない良好なものであった。A speed of 15 m /
And a polypropylene fiber was fixed by thermal fusion of propylene / ethylene / butene-1 random copolymer to obtain a non-woven fabric. This non-woven fabric was heated by an air-through processing machine in the same manner as in Example 1, immediately wound on a metal mandrel having an outer diameter of 30 mm, allowed to stand at room temperature and cooled. After cooling, pull out the mandrel and cut the remaining fiber molding to obtain an outer diameter of 60 m.
A cylindrical filter having a diameter of m, an inner diameter of 30 mm and a length of 250 mm was produced. As a result of measuring the sample sampled from the web being spun, the average fiber diameter is 1 on the inner surface of the filter.
0.2 μm, 0.8 μm at 7 mm from the inside, and 9.8 μm at the outer surface. When the filtration performance of this filter was measured, the pressure resistance was 7.0 kg / cm 2 , the filtration accuracy was 1.1 μm, the filtration life was 40 minutes, and the filtered water was good without bubbling.
【００３７】〔比較例 １〕孔径０．３ｍｍ、孔数５０
１の単一成分型メルトブロ−用口金を用い、ＭＦＲが６
８（ｇ／１０分、ａｔ２３０℃）、融点１６４℃のポリ
プロピレンを、総吐出量１２０ｇ／分、紡糸温度は３０
０℃、ブローイング空気の温度３８０℃圧力１．４ｋｇ
／ｃｍ2・Ｇの一定、の条件で紡糸し、吸引装置付きの
コンベアネット上に吹き付け、目付５２．０ｇ／ｍ2の
極細繊維ウエブを得、紙管に巻き取った。この極細繊維
ウエブには、繊維自身が保有する熱により、繊維間に弱
い接着が発生していた。この極細繊維ウエブを速度１５
ｍ／分、雰囲気温度１７０℃の条件のエアスルー加工機
で加熱して不織布を得た。この不織布、繊維同士は融着
していたが、激しい熱収縮により多くの皺が発生し、フ
ィルターの製造には不適当なものと判断された。[Comparative Example 1] 0.3 mm hole diameter, 50 holes
MFR of 6 using the single component type melt blow die
8 (g / 10 min, at 230 ° C.), polypropylene having a melting point of 164 ° C., a total discharge amount of 120 g / min, a spinning temperature of 30
0 ℃, blowing air temperature 380 ℃ pressure 1.4kg
/ Cm 2 · G constant, spinning was performed and sprayed onto a conveyor net equipped with a suction device to obtain an ultrafine fiber web having a basis weight of 52.0 g / m 2 and wound on a paper tube. In this ultrafine fiber web, weak adhesion occurs between the fibers due to the heat of the fibers themselves. This ultrafine fiber web is spun at a speed of 15
A nonwoven fabric was obtained by heating with an air-through processing machine under the conditions of m / min and an ambient temperature of 170 ° C. The non-woven fabric and the fibers were fused to each other, but many wrinkles were generated due to severe heat shrinkage, and it was judged to be unsuitable for manufacturing a filter.
【００３８】〔比較例 ２〕紡糸条件を前記比較例１と
同条件で紡糸し、得られた極細繊維ウエブを速度１５ｍ
／分、雰囲気温度１６５℃の条件のエアスルー加工機で
加熱しながら、外径３０ｍｍの金属製中芯に巻取り、室
温に放冷した後中芯を抜き取って切断し、外径６０ｍ
ｍ、内径３０ｍｍ、長さ２５０ｍｍの筒状フィルターを
得た。極細繊維ウエブの加熱条件が前記比較例１よりも
低温であったので熱収縮によるしわの発生は前記比較例
１に比べかなり少なかった。しかし、繊維同士の融着が
少なく、得られた円筒フィルターは、手で押すと簡単に
変形する程度の柔らかいものであった。紡糸中のウエブ
からサンプリングした試料を測定した結果、平均繊維径
はフイルターの内側表面で３．５ミクロン、内側から内
側から１０ｍｍで３．７μｍ、外側表面で３．７μｍと
ほぼ一定であった。このフィルターの濾過性能を測定し
たところ、耐圧強度は１．９ｋｇ／ｃｍ2、濾過精度は
１８μｍ、濾過ライフは１２１分であった。[Comparative Example 2] Spinning was carried out under the same spinning conditions as in Comparative Example 1, and the obtained ultrafine fiber web was spun at a speed of 15 m.
/ M, while heating with an air through machine under the conditions of an ambient temperature of 165 ° C, it is wound on a metal core having an outer diameter of 30 mm, allowed to cool to room temperature, and then the core is extracted and cut to an outer diameter of 60 m.
A cylindrical filter having a diameter of m, an inner diameter of 30 mm and a length of 250 mm was obtained. Since the heating condition of the ultrafine fiber web was lower than that of Comparative Example 1, the occurrence of wrinkles due to heat shrinkage was considerably smaller than that of Comparative Example 1. However, the fusion between fibers was small, and the obtained cylindrical filter was soft enough to be easily deformed when pushed by hand. As a result of measuring a sample sampled from the web being spun, the average fiber diameter was 3.5 μm on the inner surface of the filter, 3.7 μm from the inner side to 10 mm from the inner side, and 3.7 μm on the outer surface, which were almost constant. When the filtration performance of this filter was measured, the pressure resistance was 1.9 kg / cm 2 , the filtration accuracy was 18 μm, and the filtration life was 121 minutes.
【００３９】[0039]
【発明の効果】本発明の筒状フィルターは、メルトブロ
ー法で紡糸された極細混合繊維であって、１０℃以上の
融点差がある高融点極細繊維と低融点極細繊維とからな
り、混合繊維中に低融点極細繊維を１０〜９０重量％含
有するウエブを巻取り、熱処理して得られ、低融点極細
繊維の熱融着により高融点極細繊維が固定されて三次元
網状構造を形成している。この筒状フイルターは極細繊
維で構成されているので濾過精度が高く、かつ繊維同士
の融着により構造が固定されたいるので、内部に補強材
がなくても耐圧強度が高く、滅菌処理や高温濾過、振
動、水圧変動等によっても濾過精度の変動がない。ま
た、濾過方向に沿って繊維径または孔径を変化させた本
発明の筒状フィルターは、上記の特長のほかにに濾過ラ
イフが長いという特徴を有する。メルトブロー法で紡糸
された極細混合繊維からなる本発明の筒状フィルターに
は、紡糸油剤を含有していていないので、油剤を除去す
るために予め洗浄するという工程が不要であり、食品分
野にも衛生的に使用できた。本発明の筒状フィルターの
製造方法によれば、構造が複雑な複合紡糸口金装置を使
用しないので、容易な操作で高性能の筒状フイルターが
得られる。The tubular filter of the present invention is an ultrafine mixed fiber spun by the melt blow method, and comprises high melting point ultrafine fiber and low melting point ultrafine fiber having a melting point difference of 10 ° C. or more. A web containing 10 to 90% by weight of low melting ultrafine fibers is wound and heat-treated, and the high melting ultrafine fibers are fixed by heat fusion of the low melting ultrafine fibers to form a three-dimensional network structure. . Since this tubular filter is made of ultrafine fibers, it has high filtration accuracy, and because the structure is fixed by fusion of the fibers to each other, the pressure resistance is high even without a reinforcing material inside, and sterilization treatment and high temperature There is no fluctuation in filtration accuracy due to filtration, vibration, water pressure fluctuation, etc. Further, in addition to the above-mentioned features, the tubular filter of the present invention in which the fiber diameter or the pore diameter is changed along the filtration direction has a feature that the filtration life is long. Since the tubular filter of the present invention comprising the ultrafine mixed fibers spun by the melt-blowing method does not contain a spinning oil agent, a step of pre-washing to remove the oil agent is unnecessary, and also in the food field. It could be used hygienically. According to the method for producing a tubular filter of the present invention, since a complex spinneret device having a complicated structure is not used, a high-performance tubular filter can be obtained by an easy operation.
Claims (16)
維であって、１０℃以上の融点差がある高融点極細繊維
と低融点極細繊維とからなり、混合繊維中に低融点極細
繊維を１０〜９０重量％含有するウエブ。1. An ultrafine mixed fiber spun by a melt blow method, comprising high melting point ultrafine fiber and low melting point ultrafine fiber having a melting point difference of 10 ° C. or more, and 10 to 10 low melting point ultrafine fibers in the mixed fiber. A web containing 90% by weight.
維からなり、１０℃以上の融点差がある高融点極細繊維
と低融点極細繊維との混合繊維が、混合繊維中に１０〜
９０重量％含有される低融点極細繊維の融着により高融
点極細繊維が固定されている不織布。2. A mixed fiber of a high melting point ultrafine fiber and a low melting point ultrafine fiber, which is composed of ultrafine mixed fibers spun by a melt blow method and has a melting point difference of 10 ° C. or more, in the mixed fiber.
A non-woven fabric in which high melting point ultrafine fibers are fixed by fusion bonding of 90% by weight of low melting point ultrafine fibers.
維からなり、１０℃以上の融点差がある高融点極細繊維
と低融点極細繊維との混合繊維が、混合繊維中に１０〜
９０重量％含有される低融点極細繊維の融着により高融
点極細繊維が固定されている立体状成形物。3. A mixed fiber of a high melting ultrafine fiber and a low melting ultrafine fiber, which is made of an ultrafine mixed fiber spun by a melt blow method and has a melting point difference of 10 ° C. or more, in the mixed fiber.
A three-dimensional molded article in which high melting point ultrafine fibers are fixed by fusion bonding of 90% by weight of low melting point ultrafine fibers.
維からなり、１０℃以上の融点差がある高融点極細繊維
と低融点極細繊維との混合繊維が、混合繊維中に１０〜
９０重量％含有される低融点極細繊維の融着により高融
点極細繊維が固定されている筒状フイルター。4. A mixed fiber of high-melting point ultrafine fiber and low-melting point ultrafine fiber, which is composed of ultrafine mixed fiber spun by the melt blow method and has a melting point difference of 10 ° C. or more, in the mixed fiber.
A tubular filter in which high melting point ultrafine fibers are fixed by fusion bonding of 90% by weight low melting point ultrafine fibers.
いずれかが複合繊維である請求項１ないし４の何れかに
記載の繊維製品。5. The fiber product according to claim 1, wherein one of the high melting point ultrafine fibers and the low melting point ultrafine fibers is a composite fiber.
維の繊維径が２０μｍ以下である請求項１ないし５の何
れかに記載の繊維製品。6. The fiber product according to claim 1, wherein the high melting ultrafine fibers and / or the low melting ultrafine fibers have a fiber diameter of 20 μm or less.
維の繊維径が０．１〜１０μｍである請求項１ないし５
の何れかに記載の繊維製品。7. The fiber diameter of the high melting ultrafine fibers and / or the low melting ultrafine fibers is 0.1 to 10 μm.
The textile product according to any one of 1.
維の繊維径が、フイルターの濾過方向に沿って順次小さ
くなり、かつ繊維径の最大／最小比が２倍以上である請
求項４に記載の筒状フィルター。8. The high-melting-point ultrafine fibers and / or the low-melting-point ultrafine fibers have a fiber diameter that gradually decreases along the filtration direction of the filter, and a maximum / minimum ratio of the fiber diameter is 2 times or more. The described cylindrical filter.
に沿って順次小さくなり、かつ孔径の最大／最小比が２
倍以上である請求項４の筒状フィルター。9. The pore size of the filtration layer is gradually decreased along the filtration direction of the filter, and the maximum / minimum ratio of pore sizes is 2.
The cylindrical filter according to claim 4, which is more than double.
向に沿って大小大の順に変化し、かつ孔径の最大／最小
比が２倍以上である請求項４の筒状フィルター。10. The tubular filter according to claim 4, wherein the pore size of the filtration layer changes in the order of size along the filtration direction of the filter, and the maximum / minimum ratio of the pore size is at least twice.
と低融点樹脂とを、低融点樹脂の押し出し量を全押し出
し量の１０〜９０重量％となるように調整しながら、そ
れぞれの押出機を用いてメルトブロー法により紡糸する
ことからなる、高融点極細繊維と低融点極細繊維とから
なる極細混合繊維ウエブの製造方法。11. Extruding a high melting point resin and a low melting point resin having a melting point difference of 10 ° C. or more while adjusting the extrusion amount of the low melting point resin to be 10 to 90% by weight of the total extrusion amount. A method for producing an ultrafine mixed fiber web comprising high-melting point ultrafine fibers and low-melting point ultrafine fibers, which comprises spinning by a melt blow method using a machine.
と低融点樹脂とを、低融点樹脂の押し出し量を全押し出
し量の１０〜９０重量％となるように調整しながら、そ
れぞれの押出機を用いてメルトブロー法により紡糸して
極細混合繊維ウエブとする工程、この極細混合繊維ウエ
ブを低融点極細繊維の軟化点から高融点極細繊維の軟化
点までの範囲の温度で熱処理する工程とからなる、低融
点極細繊維の融着により高融点極細繊維が固定されてい
る不織布の製造方法。12. Extrusion of a high melting point resin and a low melting point resin having a melting point difference of 10 ° C. or more while adjusting the extrusion amount of the low melting point resin to be 10 to 90% by weight of the total extrusion amount. From the step of spinning to an ultrafine mixed fiber web by a melt blow method using a machine, the step of heat treating the ultrafine mixed fiber web at a temperature in the range from the softening point of the low melting ultrafine fiber to the softening point of the high melting ultrafine fiber A method for producing a non-woven fabric in which high melting point ultrafine fibers are fixed by fusing low melting point ultrafine fibers.
と低融点樹脂とを、低融点樹脂の押し出し量を全押し出
し量の１０〜９０重量％となるように調整しながら、そ
れぞれの押出機を用いてメルトブロー法により紡糸して
極細混合繊維ウエブとする工程、この極細混合繊維ウエ
ブを低融点極細繊維の軟化点から高融点極細繊維の軟化
点までの範囲の温度で熱成形することからなる、低融点
極細繊維の融着により高融点極細繊維が固定されている
成形物の製造方法。13. Extruding a high melting point resin and a low melting point resin having a melting point difference of 10 ° C. or more while adjusting the extrusion amount of the low melting point resin to be 10 to 90% by weight of the total extrusion amount. The process of spinning by a melt blow method using a machine to obtain an ultrafine mixed fiber web, because this ultrafine mixed fiber web is thermoformed at a temperature in the range from the softening point of the low melting ultrafine fibers to the softening point of the high melting ultrafine fibers. A method for producing a molded article, wherein the high melting point ultrafine fibers are fixed by fusing the low melting point ultrafine fibers.
と低融点樹脂とを、低融点樹脂の押し出し量を全押し出
し量の１０〜９０重量％となるように調整しながら、そ
れぞれの押出機を用いてメルトブロー法により紡糸して
極細混合繊維ウエブとする工程、この極細混合繊維ウエ
ブを低融点極細繊維の軟化点から高融点極細繊維の軟化
点までの範囲の温度で熱処理する工程、及びこの極細混
合繊維ウエブを筒状に巻取る工程とからなる、低融点極
細繊維の融着により高融点極細繊維が固定されている筒
状フイルターの製造方法。14. A high melting point resin and a low melting point resin having a melting point difference of 10 ° C. or more are extruded while adjusting the extrusion amount of the low melting point resin to be 10 to 90% by weight of the total extrusion amount. Using a machine to make an ultrafine mixed fiber web by spinning by a melt blow method, a step of heat-treating this ultrafine mixed fiber web at a temperature in the range from the softening point of the low melting ultrafine fiber to the softening point of the high melting ultrafine fiber, and A method for producing a tubular filter in which high melting point ultrafine fibers are fixed by fusing low melting point ultrafine fibers, which comprises a step of winding the ultrafine mixed fiber web into a tube shape.
エブを得る工程において、吐出量または紡糸速度を順次
変化させることにより、繊維径を連続的または段階的に
変化させた極細混合繊維ウエブを得ることを特徴とす
る、請求項１４記載の筒状フイルターの製造方法。15. An ultrafine mixed fiber web in which a fiber diameter is continuously or stepwise changed by sequentially changing a discharge amount or a spinning speed in a step of obtaining an ultrafine mixed fiber web by a melt blow spinning method. 15. The method for manufacturing a tubular filter according to claim 14, wherein:
おいて、ウエブに加える圧力を順次変化させることを特
徴とする請求項１４記載の筒状フィルターの製造方法。16. The method for producing a tubular filter according to claim 14, wherein in the step of winding the ultrafine mixed fiber web, the pressure applied to the web is sequentially changed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6159430A JPH0782649A (en) | 1993-07-16 | 1994-06-17 | Blended ultra-fine fiber good and its production |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19907093 | 1993-07-16 | ||
| JP5-199070 | 1993-07-16 | ||
| JP6159430A JPH0782649A (en) | 1993-07-16 | 1994-06-17 | Blended ultra-fine fiber good and its production |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0782649A true JPH0782649A (en) | 1995-03-28 |
Family
ID=26486245
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6159430A Pending JPH0782649A (en) | 1993-07-16 | 1994-06-17 | Blended ultra-fine fiber good and its production |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0782649A (en) |
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09143853A (en) * | 1995-11-21 | 1997-06-03 | Chisso Corp | Laminated nonwoven fabric and its production |
| JP2002541337A (en) * | 1999-02-17 | 2002-12-03 | フィルトロナ、リッチモンド、インコーポレーテッド | Method and apparatus for spinning a web of mixed fibers and articles made therefrom |
| JP2005007268A (en) * | 2003-06-18 | 2005-01-13 | Unitika Ltd | Nonwoven fabric for filter and method for manufacturing the same |
| US7033497B1 (en) | 1999-03-30 | 2006-04-25 | Chisso Corporation | Filter cartridge |
| US7405171B2 (en) | 2002-08-08 | 2008-07-29 | Chisso Corporation | Elastic nonwoven fabric and fiber products manufactured therefrom |
| JP2008545066A (en) * | 2005-03-17 | 2008-12-11 | ダウ グローバル テクノロジーズ インコーポレイティド | Three-dimensional random loop structures made from ethylene / α-olefin copolymers and uses thereof |
| JP2012000559A (en) * | 2010-06-16 | 2012-01-05 | Kureha Ltd | Method of producing filter medium for use in microcylindrical filter |
| WO2013089213A1 (en) | 2011-12-16 | 2013-06-20 | 東レ株式会社 | Mixed-fiber non-woven fabric, laminate sheet, filter, and method for producing mixed-fiber non-woven fabric |
| KR101379069B1 (en) * | 2012-04-06 | 2014-04-02 | 웅진케미칼 주식회사 | Manufacturing method of filter assembly for fan type cooling apparatus |
| WO2014168066A1 (en) | 2013-04-11 | 2014-10-16 | 東レ株式会社 | Mixed-fiber nonwoven fabric and method for manufacturing same |
| JP2015097979A (en) * | 2013-11-18 | 2015-05-28 | Jnc株式会社 | Filter |
| JP2015161041A (en) * | 2014-02-27 | 2015-09-07 | 東レ株式会社 | Mixed fiber nonwoven fabric |
| JP2015196920A (en) * | 2014-04-01 | 2015-11-09 | 東レ株式会社 | Mixed fiber nonwoven fabric |
| WO2020174951A1 (en) * | 2019-02-28 | 2020-09-03 | 富士フイルム株式会社 | Filter for liquids, and method for manufacturing filter for liquids |
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-
1994
- 1994-06-17 JP JP6159430A patent/JPH0782649A/en active Pending
Cited By (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09143853A (en) * | 1995-11-21 | 1997-06-03 | Chisso Corp | Laminated nonwoven fabric and its production |
| JP2002541337A (en) * | 1999-02-17 | 2002-12-03 | フィルトロナ、リッチモンド、インコーポレーテッド | Method and apparatus for spinning a web of mixed fibers and articles made therefrom |
| US7033497B1 (en) | 1999-03-30 | 2006-04-25 | Chisso Corporation | Filter cartridge |
| US7405171B2 (en) | 2002-08-08 | 2008-07-29 | Chisso Corporation | Elastic nonwoven fabric and fiber products manufactured therefrom |
| JP2005007268A (en) * | 2003-06-18 | 2005-01-13 | Unitika Ltd | Nonwoven fabric for filter and method for manufacturing the same |
| JP4522671B2 (en) * | 2003-06-18 | 2010-08-11 | ユニチカ株式会社 | Nonwoven fabric for filter and method for producing the same |
| JP2008545066A (en) * | 2005-03-17 | 2008-12-11 | ダウ グローバル テクノロジーズ インコーポレイティド | Three-dimensional random loop structures made from ethylene / α-olefin copolymers and uses thereof |
| JP2012000559A (en) * | 2010-06-16 | 2012-01-05 | Kureha Ltd | Method of producing filter medium for use in microcylindrical filter |
| KR20140108216A (en) | 2011-12-16 | 2014-09-05 | 도레이 카부시키가이샤 | mixed-fiber non-woven fabric, laminate sheet, filter, and method for producing mixed-fiber non-woven fabric |
| WO2013089213A1 (en) | 2011-12-16 | 2013-06-20 | 東レ株式会社 | Mixed-fiber non-woven fabric, laminate sheet, filter, and method for producing mixed-fiber non-woven fabric |
| US9266046B2 (en) | 2011-12-16 | 2016-02-23 | Toray Industries, Inc. | Mixed-fiber nonwoven fabric, laminated sheet and filter, and process for producing mixed-fiber nonwoven fabric |
| KR101379069B1 (en) * | 2012-04-06 | 2014-04-02 | 웅진케미칼 주식회사 | Manufacturing method of filter assembly for fan type cooling apparatus |
| KR20150140655A (en) | 2013-04-11 | 2015-12-16 | 도레이 카부시키가이샤 | Mixed-fiber nonwoven fabric and method for manufacturing same |
| WO2014168066A1 (en) | 2013-04-11 | 2014-10-16 | 東レ株式会社 | Mixed-fiber nonwoven fabric and method for manufacturing same |
| JPWO2014168066A1 (en) * | 2013-04-11 | 2017-02-16 | 東レ株式会社 | Mixed fiber nonwoven fabric and method for producing the same |
| JP2015097979A (en) * | 2013-11-18 | 2015-05-28 | Jnc株式会社 | Filter |
| JP2015161041A (en) * | 2014-02-27 | 2015-09-07 | 東レ株式会社 | Mixed fiber nonwoven fabric |
| JP2015196920A (en) * | 2014-04-01 | 2015-11-09 | 東レ株式会社 | Mixed fiber nonwoven fabric |
| WO2020174951A1 (en) * | 2019-02-28 | 2020-09-03 | 富士フイルム株式会社 | Filter for liquids, and method for manufacturing filter for liquids |
| JPWO2020174951A1 (en) * | 2019-02-28 | 2021-12-23 | 富士フイルム株式会社 | Liquid filter and manufacturing method of liquid filter |
| EP4144427A4 (en) * | 2020-04-30 | 2023-10-11 | JNC Corporation | Depth filter |
| WO2023042493A1 (en) * | 2021-09-17 | 2023-03-23 | Jnc株式会社 | Depth filter |
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