JP2797482B2 - Nonwoven fabric with good uniformity - Google Patents
Nonwoven fabric with good uniformityInfo
- Publication number
- JP2797482B2 JP2797482B2 JP1190245A JP19024589A JP2797482B2 JP 2797482 B2 JP2797482 B2 JP 2797482B2 JP 1190245 A JP1190245 A JP 1190245A JP 19024589 A JP19024589 A JP 19024589A JP 2797482 B2 JP2797482 B2 JP 2797482B2
- Authority
- JP
- Japan
- Prior art keywords
- nonwoven fabric
- unevenness
- present
- diameter
- yarn diameter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 239000004745 nonwoven fabric Substances 0.000 title claims description 34
- 239000000835 fiber Substances 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 13
- 239000000155 melt Substances 0.000 claims description 6
- 238000007664 blowing Methods 0.000 claims description 3
- 239000012530 fluid Substances 0.000 description 15
- 229920000642 polymer Polymers 0.000 description 12
- 239000000463 material Substances 0.000 description 6
- 238000001471 micro-filtration Methods 0.000 description 6
- 239000004744 fabric Substances 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 239000004750 melt-blown nonwoven Substances 0.000 description 5
- -1 polypropylene Polymers 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- 229920001410 Microfiber Polymers 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 239000012528 membrane Substances 0.000 description 3
- 229920000139 polyethylene terephthalate Polymers 0.000 description 3
- 239000005020 polyethylene terephthalate Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000002657 fibrous material Substances 0.000 description 2
- 238000005194 fractionation Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 229920002292 Nylon 6 Polymers 0.000 description 1
- 229920002302 Nylon 6,6 Polymers 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000012993 chemical processing Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- BXKDSDJJOVIHMX-UHFFFAOYSA-N edrophonium chloride Chemical compound [Cl-].CC[N+](C)(C)C1=CC=CC(O)=C1 BXKDSDJJOVIHMX-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004049 embossing Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
Landscapes
- Nonwoven Fabrics (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は均繊度の良好な不織布、さらに詳しくは極細
繊維より成るメルトブロー不織布に関する。Description: TECHNICAL FIELD The present invention relates to a nonwoven fabric having good uniformity, and more particularly to a meltblown nonwoven fabric made of ultrafine fibers.
（従来の技術） メルトブロー法により製造される不織布（以下「メル
トブロー不織布」という。）は、特公昭43−20248号公
報、特公昭43−30016号公報、特公昭44−12848号公報、
特公昭44−13210号公報、特公昭44−22525号公報、特公
昭44−25870号公報、特公昭44−25872号公報、特開昭54
−134177号公報、特公昭54−160862号公報、特開昭54−
147276号公報等に開示されているが、これらの不織布
は、切断した糸条を積層シート化したものであって、糸
径斑も著しいものであった。(Prior Art) Non-woven fabrics manufactured by a melt blowing method (hereinafter referred to as "melt blow non-woven fabrics") are disclosed in JP-B-43-20248, JP-B-43-30016, JP-B-44-12848,
JP-B-44-13210, JP-B-44-22525, JP-B-44-25870, JP-B-44-25872, JP-A-54
JP-A-134177, JP-B-54-160862, JP-A-54-
As disclosed in, for example, Japanese Patent No. 147276, these nonwoven fabrics are formed by laminating a cut yarn into a laminated sheet, and the yarn diameter unevenness is also remarkable.
その後、上記方法の改良法が多数提案され、フィラメ
ント条のメルトブロー不織布が可能となった。例えば特
開昭53−38767号公報、特開昭53−114975号公報、特開
昭54−131087号公報、特開昭54−46915号公報、特開昭6
0−209010号公報等が例示される。これらの方法でも糸
径斑は改善されてはいない。このため精密濾過用フィル
ターや隔膜材には機能不足である。After that, many improved methods of the above method were proposed, and a melt-blown nonwoven fabric having a filament strip was made possible. For example, JP-A-53-38767, JP-A-53-114975, JP-A-54-131087, JP-A-54-46915, and JP-A-64-46915
Japanese Patent Publication No. 0-209010 is exemplified. Even with these methods, the unevenness of the yarn diameter is not improved. For this reason, the function of the filter for microfiltration or the membrane material is insufficient.
（発明が解決しようとする課題） 本発明は、上記従来技術の欠点、すなわち、極細化と
同時に糸径斑の不良を改善して精密濾過や分離膜の性能
向上が図れる均繊度の良好な不織布、特に極細繊維から
成るメルトブロー不織布を提供しようとするものであ
る。(Problems to be Solved by the Invention) The present invention has the disadvantages of the above-mentioned prior art, that is, a nonwoven fabric with good uniformity that can improve the performance of microfiltration and separation membranes by improving the defect of yarn diameter unevenness while improving the ultrafineness. In particular, it is an object of the present invention to provide a melt-blown nonwoven fabric made of ultrafine fibers.
（課題を解決するための手段） 本発明は、上記の課題を解決するために次の手段をと
るものである。すなわち、本発明はメルトブロー法によ
り得られる不織布であって不織布を構成する繊維の平均
糸径Ｄ（μｍ）と糸径の変動率（CV）が下記の関係を満
足し、実質的にフィラメント状である繊維よりなること
を特徴とする均繊度の良好な不織布である。(Means for Solving the Problems) The present invention employs the following means to solve the above problems. That is, the present invention is a nonwoven fabric obtained by a melt blowing method, wherein the average yarn diameter D (μm) of the fibers constituting the nonwoven fabric and the variation rate (CV) of the yarn diameter satisfy the following relationship, and are substantially filamentous. It is a nonwoven fabric having good uniformity characterized by being composed of certain fibers.
CV≦0.3−0.015D ……（１） Ｄ≦５（μｍ） ……（２） 本発明の不織布はメルトブロー不織布からなる。すな
わち、複合紡糸等のような煩雑な工程を省略し、簡単な
製法で安価な不織布を提供するためである。CV ≦ 0.3−0.015D (1) D ≦ 5 (μm) (2) The nonwoven fabric of the present invention comprises a melt-blown nonwoven fabric. That is, the purpose is to provide an inexpensive nonwoven fabric by a simple manufacturing method by omitting complicated steps such as composite spinning.
本発明に係る不織布を構成する繊維の平均糸径Ｄは５
μｍ以下である。５μｍを越える太い糸径では嵩密度を
著しく高くしても微粒子の捕捉が困難になるので好まし
くない。好ましい糸径は３μｍ以下、より好ましい糸径
は1.5μｍ以下、0.1μｍ以上である。しかして均繊度が
劣ると精密濾過や隔膜に必要な分画機能が劣るようにな
るので好ましくない。この為本発明の不織布を構成する
繊維の糸径の変動率CVは次式を同時に満足する必要があ
る。すなわち CV≦0.3−0.15D…（１）を少なくとも満たす必要があ
る。The average yarn diameter D of the fibers constituting the nonwoven fabric according to the present invention is 5
μm or less. Thick yarn diameters exceeding 5 μm are not preferred because even if the bulk density is significantly increased, it becomes difficult to capture fine particles. The preferred yarn diameter is 3 μm or less, more preferably 1.5 μm or less, and 0.1 μm or more. However, if the uniformity is inferior, the fractionation function required for microfiltration or a diaphragm becomes inferior, which is not preferable. For this reason, it is necessary that the variation rate CV of the yarn diameter of the fiber constituting the nonwoven fabric of the present invention simultaneously satisfies the following expression. That is, it is necessary to satisfy at least CV ≦ 0.3−0.15D (1).
平均糸径Ｄ（μｍ）が太くなるほど、糸径の変動率CV
の影響が大きくなり分画機能の低下も著しくなる。As the average yarn diameter D (μm) increases, the yarn diameter variation rate CV increases.
And the deterioration of the fractionation function becomes remarkable.
好ましい変動率の範囲は CV≦0.2−0.03D より好ましい変動率の範囲は CV≦0.15−0.04D である。 A preferable range of the fluctuation rate is CV ≦ 0.2−0.03D. A more preferable range of the fluctuation rate is CV ≦ 0.15−0.04D.
本発明の不織布を構成する繊維は実質的にフィラメン
ト状である。The fibers constituting the nonwoven fabric of the present invention are substantially filamentous.
本発明で定義する、実質的にフィラメント状とは、顕
微鏡観察で不織布1cm2あたりの、繊維切断端が200以下
好ましくは100以下のものを言う。The term “substantially filamentous” as defined in the present invention refers to a fiber having a fiber cut end of 200 or less, preferably 100 or less per 1 cm 2 of a nonwoven fabric observed by a microscope.
短繊維状では精密濾過を試みる場合、濾過材が脱落す
る問題を生じるので好ましくない。また、不織布の集合
体特性からも機能低下が著しくかつ強度的にも劣る。In the case of short fibrous materials, it is not preferable to attempt microfiltration because a problem occurs in that the filter material falls off. In addition, the deterioration of the function is remarkable from the characteristics of the aggregate of the nonwoven fabric and the strength is also poor.
この問題を解決するには性能低下を許容し接着剤を使
うしか今のところ方法はない。The only way to solve this problem is to use a glue while allowing for performance degradation.
かくの如くフィラメント状繊維から成る不織布が本発
明にとっては必要である。又本発明の不織布は機能が損
なわれない範囲で部分的に接着または融着されていても
よい。Thus, a nonwoven fabric composed of filamentary fibers is necessary for the present invention. The nonwoven fabric of the present invention may be partially adhered or fused as long as the function is not impaired.
本発明のメルトブロー不織布は幅方向の目付斑が好ま
しくは目付の変動率CVmで少なくとも0.1以下、より好ま
しくは0.05以下である。0.1を越えるとフィルターとし
て使う場合、偏流れして性能が劣る場合があり好ましく
はない。また隔膜として使う場合も分離機能に斑を生じ
るので性能が低下する問題を起こす場合がある。同様に
縦方向の目付斑も問題を起こす場合がある。The melt-blown nonwoven fabric of the present invention preferably has a variation in the weight per unit area in the width direction of at least 0.1 or less, more preferably 0.05 or less, in terms of a variation rate CVm of the weight. If it exceeds 0.1, it is not preferable because when used as a filter, the flow may be deviated and the performance may be inferior. Also, when used as a diaphragm, there may be a problem in that the performance is degraded because spots occur in the separation function. Similarly, vertical eye spots can cause problems.
本発明不織布の強度は液体フィルターに使用する場合
や加工性を確保する為にも縦方向及び横方向とも少なく
とも5g/cm目付以上の強度が好ましい。The strength of the nonwoven fabric of the present invention is preferably at least 5 g / cm in both the vertical and horizontal directions for use in a liquid filter and for ensuring processability.
本発明を満たすに必要な繊維素材は特には特定されな
いが、好ましくはポリエステル、ナイロン、ポリプロピ
レン、ウレタン、ポリエチレン、ポリビニールアルコー
ル、ポリアクリル、ポリ塩化ポリマー等および、それら
の改質ポリマー等例えば全芳香族系ポリマーやブレンド
ポリマー及び特殊な官能基を付加させたポリマー等が例
示できる。なおポリマーに種々の添加剤を加えたものも
含有される。分子量は強度を保持するため出来るだけ高
いものが好ましい。たとえばポリエチレンテレフタレー
トでは極限粘度で0.5以上が好ましい。またナイロン66
では相対粘度で1.2以上が好ましい。The fiber material required to satisfy the present invention is not particularly specified, but is preferably polyester, nylon, polypropylene, urethane, polyethylene, polyvinyl alcohol, polyacryl, polychlorinated polymer and the like, and their modified polymers such as wholly aromatic. Examples include group-based polymers, blended polymers, and polymers to which special functional groups have been added. In addition, what added various additives to the polymer is also contained. The molecular weight is preferably as high as possible to maintain strength. For example, in the case of polyethylene terephthalate, the intrinsic viscosity is preferably 0.5 or more. Also nylon 66
In this case, the relative viscosity is preferably 1.2 or more.
本発明不織布の乾熱130℃での収縮率は寸法安定性の
観点から好ましくは５％以下、より好ましくは１％以下
が良い。The shrinkage ratio of the nonwoven fabric of the present invention at a dry heat of 130 ° C. is preferably 5% or less, more preferably 1% or less, from the viewpoint of dimensional stability.
本発明の不織布を得る方法はメルトブロー法を利用す
る。メルトブロー法は公知の方法を基本とするが本発明
の不織布を得るには紡出する繊維の均繊度を良好にする
必要から、吐出量斑や牽引斑を出来るだけ少なくするの
が不可欠となる。このことはポリマーの吐出斑、粘度
斑、温度斑および牽引流体の流量斑や温度斑を同時に少
なくしなければならない。このような条件を満たすメル
トブロー法としては、押し出し機、ヘッド及びノズルは
デッドスペースの無い構造とする。またノズルオリフィ
スの径は出来るだけ細くして吐出線速度を高くし、牽引
流体によるドラフト比を少なくする。好ましいノズルオ
リフィス径は吐出量により異なるが0.1g/分孔では0.15m
m以下、0.02g/分孔では0.1mm以下が好ましい。吐出量に
比しオリフィス径が大きくなると均繊度が悪くなるので
好ましくない。また、ブロックおよびノズルの加熱は温
度斑の無いように充分な保温とヒーターの構造及びコン
トロール方法を工夫し均一加熱出来るようにする。好ま
しいブロックでの温度差は±２℃以内である。温度斑が
大きくなるとポリマーの粘度斑や熱履歴差による分子量
斑が大きくなり糸径斑が拡大されるので好ましくない。
更にはそれに伴い吐出量の斑も起こる。The method for obtaining the nonwoven fabric of the present invention utilizes a melt blow method. The melt blow method is based on a known method, but in order to obtain the non-woven fabric of the present invention, it is necessary to improve the uniformity of the spun fibers. This must simultaneously reduce polymer spots, viscosity spots, temperature spots and traction fluid flow spots and temperature spots. As a melt blow method that satisfies such conditions, the extruder, head and nozzle have a structure without dead space. Further, the diameter of the nozzle orifice is made as small as possible to increase the discharge linear velocity, and to reduce the draft ratio by the traction fluid. The preferred nozzle orifice diameter depends on the discharge rate, but 0.15m for 0.1g / min hole
m or less, and 0.1 mm or less for 0.02 g / minute hole. It is not preferable that the diameter of the orifice is larger than the discharge amount, because the uniformity is deteriorated. In addition, the heating of the block and the nozzle is performed so as to maintain sufficient heat so that there is no unevenness in temperature, and the structure and control method of the heater are devised so that uniform heating can be performed. The temperature difference in the preferred block is within ± 2 ° C. If the temperature unevenness becomes large, the molecular weight unevenness due to the viscosity unevenness of the polymer and the difference in heat history becomes large, and the yarn diameter unevenness is undesirably enlarged.
In addition, unevenness in the discharge amount also occurs.
同じ現象がデッドスペースの存在や配管の壁面と中心
との熱履歴差でも起こる。さらには流路長差によっても
起こるし偏流によっても起こる。これを紡糸するには配
管内にスタティクミキサー等を設置しデッドを無くし均
流化できる構造とする。また圧力分配が不均一になると
偏流を生じ上記と同じ現象につながる。このためブロッ
ク内やノズル内は低吐出量でも適度な圧力損失が付加さ
れた圧力室となり、かつ、圧力バランスが均一になるよ
う均一分配できる構造とする。The same phenomenon occurs due to the existence of dead space and the difference in heat history between the wall and the center of the pipe. Furthermore, it is caused by a difference in flow path length and by a drift. In order to spin this, a static mixer or the like is installed in the pipe to have a structure capable of eliminating dead and uniform flow. If the pressure distribution becomes non-uniform, a drift occurs, which leads to the same phenomenon as described above. Therefore, the inside of the block and the inside of the nozzle become a pressure chamber to which an appropriate pressure loss is added even with a small discharge amount, and the structure is such that the pressure can be uniformly distributed so that the pressure balance becomes uniform.
牽引流体の流量斑は牽引斑を引き起こすので出来るだ
け均一分配出来るような例えば、供給部のヘッダーは大
きくし供給口は多分割化しリップ背面に抵抗を付ける
等、構造上の工夫が必要である。好ましい牽引流体の流
量差は流体温度差±２℃ではリップ面出口での流速差と
して±10m/秒以内である。Unevenness in the flow rate of the traction fluid causes traction unevenness, so that it can be distributed as uniformly as possible. For example, it is necessary to devise a structural measure such as making the supply section header large, multiplying the supply port and adding resistance to the back of the lip. A preferable flow rate difference of the traction fluid is within ± 10 m / sec as a flow velocity difference at the outlet of the lip surface at a fluid temperature difference of ± 2 ° C.
牽引流体の温度斑も牽引斑を起こす。温度斑は流量斑
とポリマーの粘度斑をも同時に引き起こすので糸径斑は
より拡大される。好ましい牽引流体の温度差は多くとも
±５℃以内、好ましくは±２℃以内である。Temperature mottling of the traction fluid also causes traction mottling. The unevenness of the temperature causes the unevenness of the flow rate and the unevenness of the viscosity of the polymer at the same time, so that the unevenness of the yarn diameter is further enlarged. Preferred traction fluid temperature differences are at most within ± 5 ° C., preferably within ± 2 ° C.
牽引流体はリップ面から流出すると、回りから同伴流
を吸引するため、均一な温度かつ流量でも回りから流入
する同伴流によるリップ面の冷却のされかたの差により
ノズルブロックに温度差を生じさせる。この為、側端部
と中央部で粘度差を生じ糸径斑を拡大する。これを防止
するには側端部からの同伴流の流入をカットしリップ面
を保温するのが好ましい。側端部と中央部の温度差はリ
ップ面の温度差で多くとも５℃以下、好ましくは３℃以
下である。When the traction fluid flows out of the lip surface, it sucks the entrained flow from around, so even at a uniform temperature and flow rate, a difference in the way the lip surface is cooled by the entrained flow flowing from around creates a temperature difference in the nozzle block. . For this reason, a difference in viscosity occurs between the side end portion and the central portion, and unevenness in yarn diameter is enlarged. To prevent this, it is preferable to cut the inflow of the entrainment flow from the side end and to keep the lip surface warm. The temperature difference between the side end portion and the center portion is at most 5 ° C. or less, preferably 3 ° C. or less, due to the temperature difference between the lip surfaces.
本発明の不織布は精密濾過などにより最適なものとす
るには構成繊維が高強度なものが好ましい為、高分子の
分子鎖は長くし高度に配向させ固化させる為、高粘度ポ
リマーを短い滞留時間で低い温度でやや強く伸長させか
つ細化完了時同時に結晶化させるのがよい。例えば、ポ
リエチレンテレフタレートでは極限粘度0.6のものを285
℃にて滞留時間10分で吐出させ、牽引流体として290℃
の空気を使い流速530m/秒にて牽引する。他の牽引流体
としては不活性な過熱蒸気や窒素が好ましい。In order to optimize the nonwoven fabric of the present invention by microfiltration or the like, it is preferable that the constituent fibers have high strength, so that the molecular chains of the polymer are long and highly oriented and solidified, so that the high viscosity polymer has a short residence time. At a low temperature, and it is preferable to crystallize simultaneously with the completion of the thinning. For example, polyethylene terephthalate with an intrinsic viscosity of 0.6
At 10 ° C with a residence time of 10 minutes.
Tow at a flow rate of 530m / sec. As the other traction fluid, inert superheated steam or nitrogen is preferable.
シート状に引き取る条件は公知の方法で良い。引取り
点は短か過ぎると融着し配向度が低くなり好ましくなく
長過ぎるとロープ状物が多くなり好ましくない。好まし
い引取り点は固化点から固化点＋10cmである。Known conditions may be used as the conditions for taking the sheet. If the take-up point is too short, it is fused and the degree of orientation becomes low, and if it is too long, the number of ropes increases, which is not preferable. The preferred take-off point is from the solidification point to the solidification point +10 cm.
かくして積層されたシート状物は次いで表面のみ１％
ないし３％程度の収縮処理を施すことで絡合点が強固に
絡み強力が向上すると共に内層は嵩高な不織布が得られ
る。必要に応じ後加工として、樹脂加工、薬品処理加
工、積層処理加工、接着加工、エンボス加工、超音波加
工、成形加工、プレス加工等を施しても良い。またどう
しても必要なら機能低下しない範囲で絡合処理も許容さ
れるがフィルターとして使う場合ニードルパンチ加工は
避けるほうが良い。The sheet material thus laminated is then only 1% on the surface
By performing the shrinkage treatment of about 3%, the entanglement point is firmly entangled, the strength is improved, and the bulky nonwoven fabric is obtained as the inner layer. If necessary, post-processing such as resin processing, chemical processing, lamination processing, adhesive processing, embossing, ultrasonic processing, molding, and pressing may be performed. If necessary, entanglement processing is allowed as long as the function is not deteriorated. However, when used as a filter, it is better to avoid needle punching.
尚本発明で定義される不織布を構成する要件の特性値
および物性値等は、下記の方法で測定した値を言う。In addition, the characteristic value, physical property value, and the like of the requirements constituting the nonwoven fabric defined in the present invention refer to values measured by the following methods.
平均糸径 不織布の電子顕微鏡鏡で撮影し1000倍の拡大写真と
し、この中から繊維100本をランダムに選択してその繊
維直径Di（μｍ）を測定し次式により平均糸径Ｄ（μ
ｍ）として求める。Average yarn diameter A non-woven fabric taken with an electron microscope is taken as an enlarged photograph of 1000 times, 100 fibers are randomly selected from these, the fiber diameter Di (μm) is measured, and the average yarn diameter D (μm) is calculated by the following formula.
m).
糸径の変動率 平均糸径と同様にして求めた繊維直径Diより次式によ
り糸径の変動率CVを求める。 Yarn diameter variation rate From the fiber diameter Di obtained in the same manner as the average yarn diameter, the yarn diameter variation rate CV is determined by the following equation.
繊維切断端数 不織布2cm2を試料台にセットし電子顕微鏡にて全表面
を撮影し500倍ないし1000倍の拡大写真にし、中央1cm2
の切断端を数える。ｎ＝３の平均値で示す。 The fiber cut fraction nonwoven 2 cm 2 to 500-fold by photographing the entire surface at a set and an electron microscope sample stage to 1000 times enlarged photograph, the central 1 cm 2
Count the cut ends. It is shown by the average value of n = 3.
幅方向目付斑 幅方向に連続して幅2cm毎に長さ15cmの試料を全幅で
取り各試料の重量Wiをｊ個測定し、以下の式によりまず
平均値Ｗを求めついで幅方向の目付斑CVmを求める。但
し耳部各5cmは除く。Specimen in the width direction Continuously in the width direction, take a sample of 15 cm in length every 2 cm in width, measure the weight Wi of each sample j, first find the average value W by the following formula, and then find the average in the width direction Find CVm. Except for each ear 5cm.
なお縦方向の目付斑も幅方向の代わりに長手方向とし
て同様にもとめる。この場合、長手方向には100cm取
る。 It should be noted that the perceptual unevenness in the vertical direction is similarly determined as the longitudinal direction instead of the width direction. In this case, 100 cm is taken in the longitudinal direction.
収縮率 不織布を20cm×20cmの試料を作成し中心部15cm×15cm
に目印を付けた試料を乾熱130℃の熱風乾燥機中に入
れ、フリー状態で15分熱処理し縦および横方向の目印の
長さLiを測定し個々に次式より求める。Shrinkage ratio A nonwoven fabric is prepared as a 20cm x 20cm sample, and the center is 15cm x 15cm
The sample marked with is placed in a hot-air dryer at a dry heat of 130 ° C., heat-treated in a free state for 15 minutes, and the length Li of the mark in the vertical and horizontal directions is measured, and each is determined by the following formula.
なお断りの無い限り、縦および横を別々に計算し加え
て平均値を求めた値を不織布の収縮率と言う。 Unless otherwise noted, the value obtained by calculating and adding the length and width separately and calculating the average value is referred to as the shrinkage ratio of the nonwoven fabric.
不織布強力 縦および横方向に目付斑の測定と同様にした試料を作
成しテンシロンにて有効試料長10cmチャックの掴みしろ
2.5cmとして100％伸長速度にて破断まで伸長歪みを記
録、最大歪みσｉ（g/2cm）を求め、次式より計算す
る。尚、試料の目付の単位は（g/m2）を用いる。ｎ＝50
で求める。Non-woven fabric strength Make a sample in the same way as the measurement of the non-uniformity in the vertical and horizontal directions, and use Tensilon to grip a 10 cm effective sample length chuck.
The elongation strain is recorded up to the fracture at 100% elongation rate at 2.5 cm, the maximum strain σi (g / 2cm) is obtained, and calculated by the following equation. The unit of basis weight of the sample is (g / m 2 ). n = 50
Ask for.
縦方向の強力をDTT、横方向の強力をDTMで示す。 The vertical strength is indicated by DTT, and the horizontal strength is indicated by DTM.
（実施例） 実施例１ テスト−１（No.1−６） 保温を充分にしてかつデッドスペースがなく配管には
スタテックミキサーをいれ分配を均一化するよう流路設
計された構造を有するブロックおよびノズルを用いてか
つヒーターも均一加熱できる密着一体構造で更に流体の
斑を起こさない構造にし極限粘度0.65のポリエチレンテ
レフタレートを280℃にて孔径0.1mmのオリフィスより0.
01から0.05g/分孔の吐出量にて吐出させ、290℃の空気
を牽引流体としてオリフィス中心を挟み75度の角度から
吐出ポリマーを牽引せしめ、下方45cmでサクションされ
たネットに引き取り、ついで連続して赤外線ヒーターに
て表面を熱処理し巻き取った。各々の製造条件と得られ
たシートの特性を第１表に示す。得られたシートは直径
10cmに打ち抜き、有効径5cmにて液体の濾過テストをお
こなった。評価結果を第１表に併記する。(Example) Example 1 Test-1 (No. 1-6) A block having a structure designed to have sufficient heat insulation and no dead space, and to have a static mixer in the piping and a flow path designed to make the distribution uniform. In addition, it uses a nozzle and a heater that can uniformly heat the heater, and has a tightly integrated structure that does not cause unevenness of fluid.Polyethylene terephthalate with an intrinsic viscosity of 0.65 is used at 280 ° C through an orifice with a pore diameter of 0.1 mm.
Discharge at a discharge rate of 01 to 0.05 g / min, and pull the discharged polymer from the angle of 75 degrees with the center of the orifice as the traction fluid using 290 ° C air as the traction fluid. Then, the surface was heat-treated with an infrared heater and wound up. Table 1 shows the production conditions and the properties of the obtained sheets. The resulting sheet has a diameter
The sheet was punched into 10 cm, and a liquid filtration test was performed with an effective diameter of 5 cm. The evaluation results are also shown in Table 1.
本発明を外れるものは液体濾過材として不適当であ
る。Those that deviate from the present invention are unsuitable as liquid filter media.
テスト−２（No.7−10） 吐出量を0.05g/分孔および0.1g/分孔に変更し流体流
速を変更した以外実験No.4と同一の条件で得たシート及
び評価結果を第２表に示す。Test-2 (No. 7-10) Sheets and evaluation results obtained under the same conditions as in Experiment No. 4 except that the discharge rate was changed to 0.05 g / min and 0.1 g / min and the fluid flow rate was changed The results are shown in Table 2.
本発明を外れるものは液体濾過材として不適当であ
る。Those that deviate from the present invention are unsuitable as liquid filter media.
テスト−３−（No.11−12） 相対粘度2.5のナイロン６を280℃にて吐出しオリフィ
ス径0.15mmおよび0.23mmのノズルを用い他の条件はNo.4
と同じとして得たシートとその評価結果を第２表に示
す。Test-3- (No.11-12) Nylon 6 with a relative viscosity of 2.5 was discharged at 280 ° C, and nozzles with orifice diameters of 0.15 mm and 0.23 mm were used.
Table 2 shows the sheets obtained as in Example 1 and the evaluation results.
本発明の外れるものは液体濾過材として不適当であ
る。Those deviating from the present invention are unsuitable as liquid filter media.
テスト−４（No.13−18） テスト−１と同じ装置を用い、供給牽引流体はスーパ
ーヒーターを使い加熱するようにして以下のテストを実
施した。Test-4 (No. 13-18) The following test was carried out using the same apparatus as in Test-1, with the supplied traction fluid heated using a super heater.
メルトインデックス（以後MIと略す）13のポリプロピ
レンを210℃から260℃にてオリフィス径0.15mmおよび0.
25mmのノズルから吐出させ280℃の過熱蒸気にて牽引
し、下方60cmにてサクションネットに引取りついで遠赤
外線ヒーターにて熱処理し、得られたシートの特性を第
３表に示す。なお、このテストは蒸気の凝縮のためピト
ー管での牽引流体の流速の測定は断念しリップ背面の圧
力および圧力変動を測定した。Melt index (hereinafter abbreviated as MI) 13 polypropylene is used at 210 ° C to 260 ° C with an orifice diameter of 0.15 mm and 0.1 mm.
Discharged from a 25 mm nozzle, pulled with superheated steam at 280 ° C., taken up at 60 cm below the suction net, heat-treated with a far-infrared heater, and the properties of the obtained sheet are shown in Table 3. In this test, the measurement of the flow velocity of the traction fluid in the pitot tube was abandoned due to the condensation of steam, and the pressure and pressure fluctuation on the back of the lip were measured.
得られたシートを嵩密度0.3g/cm3になるよう熱プレス
し電池用隔膜性能を試供して求評した。結果を第３表に
併記する。The obtained sheet was hot-pressed so as to have a bulk density of 0.3 g / cm 3 , and evaluated for battery membrane performance as a sample. The results are shown in Table 3.
なお、隔膜性能は以下の基準で評価した。 In addition, the diaphragm performance was evaluated based on the following criteria.
本発明で外れるものは隔膜性能が劣る。 Those deviating in the present invention have inferior diaphragm performance.
（発明の効果） 本発明の不織布は、極細でかつ均繊度が良好な繊維か
ら構成されている為精密濾過材や隔膜材として優れた機
能を発揮する。 (Effect of the Invention) Since the nonwoven fabric of the present invention is composed of ultrafine fibers having good uniformity, it exhibits excellent functions as a microfiltration material or a diaphragm material.
この優れた性能は、他の用途、例えば、気体フィルタ
ー、メディカル用品、衛生材クリーンルーム用品等のデ
ィスポーザブル用途、保温材、日用雑貨品などにも適す
るものである。This excellent performance is suitable for other uses, for example, disposable uses such as gas filters, medical supplies, sanitary materials and clean room supplies, heat insulating materials, daily necessities and the like.
フロントページの続き (56)参考文献 特開 昭63−235560（ＪＰ，Ａ) 特開 昭57−29610（ＪＰ，Ａ) (58)調査した分野(Int.Cl.6，ＤＢ名) D04H 1/00 - 13/02Continuation of front page (56) References JP-A-63-235560 (JP, A) JP-A-57-29610 (JP, A) (58) Fields investigated (Int. Cl. 6 , DB name) D04H 1 / 00-13/02
Claims (1)
って、不織布を構成する繊維の平均繊維径Ｄ（μｍ）と
その糸径の変動率CVが下記を満足し、顕微鏡観察で不織
布1cm2あたりの繊維切断端が200以下のフィラメント状
である繊維よりなることを特徴とする均繊度の良好な不
織布。 CV≦0.3−0.015D ……（１） Ｄ≦５（μｍ） ……（２）1. A non-woven fabric obtained by a melt blowing method, wherein the average fiber diameter D (μm) of the fibers constituting the non-woven fabric and the rate of change CV of the yarn diameter satisfy the following, and are observed by microscopic observation per 1 cm 2 of the non-woven fabric. A nonwoven fabric with good uniformity, characterized in that the fiber cut ends are made of fibers having a filament shape of 200 or less. CV ≦ 0.3−0.015D (1) D ≦ 5 (μm) (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1190245A JP2797482B2 (en) | 1989-07-21 | 1989-07-21 | Nonwoven fabric with good uniformity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1190245A JP2797482B2 (en) | 1989-07-21 | 1989-07-21 | Nonwoven fabric with good uniformity |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0359158A JPH0359158A (en) | 1991-03-14 |
| JP2797482B2 true JP2797482B2 (en) | 1998-09-17 |
Family
ID=16254927
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1190245A Expired - Fee Related JP2797482B2 (en) | 1989-07-21 | 1989-07-21 | Nonwoven fabric with good uniformity |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2797482B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2021098924A (en) * | 2019-12-23 | 2021-07-01 | 東レ株式会社 | Spun-bonded nonwoven fabric, pleat molded article, dust collector filter and pulse jet type dust collector having large amount of air capacity |
| JP2021155906A (en) * | 2017-06-08 | 2021-10-07 | アセンド・パフォーマンス・マテリアルズ・オペレーションズ・リミテッド・ライアビリティ・カンパニーAscend Performance Materials Operations Llc | Polyamide nanofiber non-woven fabric |
| JPWO2023189755A1 (en) * | 2022-03-29 | 2023-10-05 |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5958322A (en) * | 1998-03-24 | 1999-09-28 | 3M Innovation Properties Company | Method for making dimensionally stable nonwoven fibrous webs |
| US6123752A (en) * | 1998-09-03 | 2000-09-26 | 3M Innovative Properties Company | High efficiency synthetic filter medium |
| CA2424079A1 (en) * | 2000-09-28 | 2003-03-27 | Uegaki, Tateo | Polishing device |
| US6667254B1 (en) * | 2000-11-20 | 2003-12-23 | 3M Innovative Properties Company | Fibrous nonwoven webs |
| KR20020075599A (en) * | 2001-03-26 | 2002-10-05 | 현대자동차주식회사 | Sanding pad |
| JP2009512578A (en) | 2005-10-19 | 2009-03-26 | スリーエム イノベイティブ プロパティズ カンパニー | Multilayer article having acoustic absorption characteristics, and method for producing and using the same |
| EP3272922A1 (en) * | 2015-03-16 | 2018-01-24 | Toray Fine Chemicals Co., Ltd. | Nonwoven fabric and method for manufacturing same |
| WO2026042864A1 (en) * | 2024-08-21 | 2026-02-26 | エム・エーライフマテリアルズ株式会社 | Non-woven fabric and non-woven fabric production method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5729610A (en) * | 1980-07-29 | 1982-02-17 | Teijin Ltd | Novel filamentlike conjugate fiber, its bundle and its production |
| JPH086242B2 (en) * | 1987-03-23 | 1996-01-24 | 旭化成工業株式会社 | Heat-shrinkable non-woven sheet and method for producing the same |
-
1989
- 1989-07-21 JP JP1190245A patent/JP2797482B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2021155906A (en) * | 2017-06-08 | 2021-10-07 | アセンド・パフォーマンス・マテリアルズ・オペレーションズ・リミテッド・ライアビリティ・カンパニーAscend Performance Materials Operations Llc | Polyamide nanofiber non-woven fabric |
| JP7170091B2 (en) | 2017-06-08 | 2022-11-11 | アセンド・パフォーマンス・マテリアルズ・オペレーションズ・リミテッド・ライアビリティ・カンパニー | Polyamide nanofiber non-woven fabric |
| JP2021098924A (en) * | 2019-12-23 | 2021-07-01 | 東レ株式会社 | Spun-bonded nonwoven fabric, pleat molded article, dust collector filter and pulse jet type dust collector having large amount of air capacity |
| JPWO2023189755A1 (en) * | 2022-03-29 | 2023-10-05 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0359158A (en) | 1991-03-14 |
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