JPH11131353A - Melt-blown nonwoven fabric and nozzle piece for melt-blowing nonwoven fabric - Google Patents
Melt-blown nonwoven fabric and nozzle piece for melt-blowing nonwoven fabricInfo
- Publication number
- JPH11131353A JPH11131353A JP9312617A JP31261797A JPH11131353A JP H11131353 A JPH11131353 A JP H11131353A JP 9312617 A JP9312617 A JP 9312617A JP 31261797 A JP31261797 A JP 31261797A JP H11131353 A JPH11131353 A JP H11131353A
- Authority
- JP
- Japan
- Prior art keywords
- nozzle
- nonwoven fabric
- melt
- hole
- fiber 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.)
- Granted
Links
- 239000004750 melt-blown nonwoven Substances 0.000 title claims abstract description 32
- 239000004744 fabric Substances 0.000 title claims abstract description 30
- 239000004745 nonwoven fabric Substances 0.000 title claims description 50
- 238000007664 blowing Methods 0.000 title description 5
- 239000000835 fiber Substances 0.000 claims abstract description 73
- 238000009826 distribution Methods 0.000 claims abstract description 35
- 229920001410 Microfiber Polymers 0.000 claims abstract description 8
- 239000006185 dispersion Substances 0.000 claims description 12
- 239000000470 constituent Substances 0.000 claims description 8
- 230000000052 comparative effect Effects 0.000 description 19
- 238000001914 filtration Methods 0.000 description 15
- 238000000034 method Methods 0.000 description 12
- 239000007788 liquid Substances 0.000 description 11
- 238000004519 manufacturing process Methods 0.000 description 9
- 229920005989 resin Polymers 0.000 description 9
- 239000011347 resin Substances 0.000 description 9
- 239000000155 melt Substances 0.000 description 5
- 238000011156 evaluation Methods 0.000 description 4
- 239000010419 fine particle Substances 0.000 description 4
- 238000010030 laminating Methods 0.000 description 4
- 229920000642 polymer Polymers 0.000 description 4
- 229920005992 thermoplastic resin Polymers 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229920000098 polyolefin Polymers 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- -1 polypropylene Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011256 inorganic filler Substances 0.000 description 1
- 229910003475 inorganic filler Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000002074 melt spinning Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229920002239 polyacrylonitrile Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000412 polyarylene Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D4/00—Spinnerette packs; Cleaning thereof
- D01D4/02—Spinnerettes
- D01D4/025—Melt-blowing or solution-blowing dies
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Textile Engineering (AREA)
- Nonwoven Fabrics (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、直径の異なる極細
繊維が適度に混合分散した繊維径分布の広いメルトブロ
ー不織布およびその製造用ノズルピースに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a melt-blown nonwoven fabric having a wide fiber diameter distribution in which ultrafine fibers having different diameters are appropriately mixed and dispersed, and a nozzle piece for producing the same.
【０００２】[0002]
【従来の技術】メルトブロー法による不織布の製造方法
は、古くからしられており、例えば、その原理は、Ｕ．
Ｓ ＮＡＶＡＬ ＲＥＳＥＡＲＣＨ ＬＡＢＯＲＡＴＯ
ＲＹ（Ｒｅｐｏｒｔ Ｎｏ．５２６５，Ｆｅｂｒｕａｒ
ｙ，１１，１９５９）によって報告されている。さらに
は、この製造方法を最初に工業化したエクソンケミカル
社の特許である特開昭５０−４６９７２号公報、あるい
は、報文Ｍｅｌｔ Ｂｌｏｗｉｎｇ−Ａ Ｏｎｅ−Ｓｔ
ｅｐ Ｗｅｂ Ｐｒｏｃｅｓｓ ｆｏｒ ＮｅｗＮｏｎ
ｗｏｖｅｎ Ｐｒｏｄｕｃｔｓ（Ｖｏｌ ５６，Ｎｏ．
４ Ａｐｒｉｌ１９７３，Ｔａｐｐｉ Ｊｏｕｒｎａｌ
誌）に詳述されている。この技術によれば、一定の孔径
を有するノズルがダイス先端に一定のピッチをおいて多
数設置され、そこから吐出された溶融ポリマーが高温の
ジェット気流中で紡糸され、比較的均一な直径をもつ極
細繊維からなる不織布が形成される。その構成繊維径
は、メルトブロー法の製造条件、たとえば支配的因子と
して、ポリマー吐出温度、吐出量、エアー量などの変更
によって、任意に変更できるが、その繊維径は比較的均
一であり、従って繊維径の分布は狭いのが特徴である。2. Description of the Related Art A method for producing a nonwoven fabric by a melt blow method has been known for a long time.
S NAVAL RESEARCH LABORATORO
RY (Report No. 5265, February
y, 11, 1959). Furthermore, Japanese Patent Application Laid-Open No. 50-46972, which is a patent of Exxon Chemical Co., Ltd., which first industrialized this production method, or Mel Blowing-A One-St.
ep Web Process for NewNon
Woven Products (Vol 56, No.
4 April 1973, Tappi Journal
Journal). According to this technology, a large number of nozzles having a fixed hole diameter are installed at a fixed pitch at the tip of the die, and the molten polymer discharged therefrom is spun in a high-temperature jet stream, and has a relatively uniform diameter. A nonwoven fabric made of ultrafine fibers is formed. The constituent fiber diameter can be arbitrarily changed by changing the production conditions of the meltblowing method, for example, changing the polymer discharge temperature, discharge amount, air amount, and the like as the dominant factors. It is characterized by a narrow diameter distribution.
【０００３】このような不織布を液体フィルターなどに
応用したとき、その濾過精度は構成繊維径に多くを依存
している。たとえば、濾過の精度を上げるためには、繊
維径の細い不織布を用い、場合によってはさらに熱カレ
ンダーロールによって圧密して不織布の有効径を小さく
して、濾過精度を上げるのが通例である。しかしなが
ら、このような極細繊維からなる不織布素材をフィルタ
ーに用いた場合、微少な粒子を補集できる反面、補集し
た粒子による目詰まりを短時間に起こしやすく、フィル
ターとしての寿命が短いという欠点がある。[0003] When such a nonwoven fabric is applied to a liquid filter or the like, its filtration accuracy largely depends on the diameter of the constituent fibers. For example, in order to increase the filtration accuracy, a nonwoven fabric having a small fiber diameter is used, and in some cases, the effective diameter of the nonwoven fabric is reduced by further consolidating with a heat calender roll to increase the filtration accuracy. However, when a nonwoven fabric material made of such ultrafine fibers is used for a filter, fine particles can be collected, but clogging due to the collected particles tends to occur in a short time, and the life of the filter is short. is there.
【０００４】これを改善するために、異なる径の繊維が
分布したメルトブロー不織布を用いる方法が考えられ、
その不織布を製造する方法としては、異なる径を持つノ
ズルを設置した２個以上のダイを用いてメルトブロー不
織布を得るマルチダイ法や繊維径の異なる複数の不織布
を積層させる方法が用いられ、フィルターとしての捕集
精度とフィルター寿命をともに向上させる手段が一般に
行われている。ここで積層する方法としては、層間に接
着剤を用いたり、熱カレンダーロールにて熱圧着するこ
とが行われている。しかしながら、このようなマルチダ
イ法や積層方法においては、異なる繊維径を有する不織
布を別個に製造する必要があること、および熱カレンダ
ーロール工程や接着剤塗布工程などが必要となること、
さらには、これらの加工による不織布の変質や使用時の
層間剥離などを伴うことがあり、品質保持の観点で課題
を抱えている。In order to improve this, a method using a melt-blown nonwoven fabric in which fibers having different diameters are distributed has been considered.
As a method of manufacturing the nonwoven fabric, a multi-die method of obtaining a melt-blown nonwoven fabric using two or more dies provided with nozzles having different diameters or a method of laminating a plurality of nonwoven fabrics having different fiber diameters are used. Means for improving both the collection accuracy and the filter life are commonly used. Here, as a method of laminating, an adhesive is used between layers, or thermocompression bonding is performed using a hot calender roll. However, in such a multi-die method or a lamination method, it is necessary to separately manufacture nonwoven fabrics having different fiber diameters, and a heat calender roll step or an adhesive application step is required,
Furthermore, the non-woven fabric may be deteriorated by these processes or delaminated during use, which poses a problem from the viewpoint of maintaining quality.
【０００５】[0005]
【発明が解決しようとする課題】本発明の目的は、前述
の問題点を解決し、高精度で、長寿命のフィルター用に
用いることのできる、同時一体的に形成された繊維径分
布が広い、単一のメルトブロー不織布およびそのメルト
ブロー不織布製造用ノズルピースを提供することを課題
とする。SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to provide a simultaneously and integrally formed fiber diameter distribution which can be used for a high-precision, long-life filter. It is an object of the present invention to provide a single melt-blown nonwoven fabric and a nozzle piece for producing the melt-blown nonwoven fabric.
【０００６】[0006]
【課題を解決するための手段】本発明者は、かかる課題
を解決するために、鋭意研究した結果、特定の範囲の異
なる孔径をもつノズル孔を配置したノズルピースを用い
ることによって、メルトブロー時の紡糸繊維径分布を変
え、直径の異なる１〜１０ミクロンの繊維が適度に混合
分散した不織布がメルトブロー時において同時一体的に
形成され、これによって、構成繊維径分布の広い不織布
を得ることが可能となり、繊維径の異なる別個の不織布
を積層張り合わせたものと同様の濾過性能を有するフィ
ルター素材を効率良く製造することができることを見出
し、本発明を完成した。Means for Solving the Problems The inventors of the present invention have conducted intensive studies in order to solve the above-mentioned problems, and as a result, the use of a nozzle piece having nozzle holes having different diameters in a specific range has enabled the use of a nozzle piece at the time of melt blowing. The spun fiber diameter distribution is changed, and a nonwoven fabric in which fibers of 1 to 10 microns having different diameters are appropriately mixed and dispersed is simultaneously and integrally formed at the time of melt blowing, thereby making it possible to obtain a nonwoven fabric having a wide constituent fiber diameter distribution. The present inventors have found that a filter material having the same filtration performance as that obtained by laminating and bonding different nonwoven fabrics having different fiber diameters can be produced efficiently, and the present invention has been completed.
【０００７】すなわち、本発明の第１の発明は、ダイ先
端部に一列に穿孔された円形ノズル孔を有するノズルピ
ースにおいて、隣接する孔径Ｄａのノズル孔Ａの間に、
ノズル孔Ａより孔径が小さい孔径Ｄｂのノズル孔Ｂのｎ
個の列を挿入配置したメルトブロー不織布用ノズルピー
スを用いて得られる繊維径が１〜１０μｍで、次式で表
される繊維径分散比Ｆが２以上である平面的にも立体的
にも繊維径分布の広い極細繊維よりなる単一のメルトブ
ロー不織布であり、 繊維径分散比Ｆ＝Ｖ／Ｖ0 （式中、Ｖ0は同一孔径の孔を有するノズルピースより
得られた不織布の構成繊維径の不偏分散値であり、Ｖは
当該不織布の構成繊維径の不偏分散値である。） 本発明の第２の発明は、ダイ先端部に一列に穿孔された
円形ノズル孔を有するノズルピースにおいて、隣接する
孔径Ｄａのノズル孔Ａの間に、ノズル孔Ａより孔径が小
さい孔径Ｄｂのノズル孔Ｂの２〜４個の列を挿入配置し
たノズルピースであって、ノズル孔Ａの孔径とノズル孔
Ｂの孔径の比Ｒ（Ｄａ／Ｄｂ）が１．３〜２．０である
メルトブロー不織布用ノズルピースである。That is, the first invention of the present invention is a nozzle piece having a circular nozzle hole drilled in a row at the tip of a die, wherein a nozzle hole A having a hole diameter Da between adjacent nozzle holes is provided.
N of the nozzle hole B having a hole diameter Db smaller than the nozzle hole A
A fiber having a fiber diameter of 1 to 10 μm obtained by using a nozzle piece for a melt-blown nonwoven fabric in which rows are inserted and arranged, and having a fiber diameter dispersion ratio F represented by the following formula of 2 or more, both planar and three-dimensional A single melt-blown non-woven fabric made of ultrafine fibers having a wide diameter distribution, and a fiber diameter dispersion ratio F = V / V 0 (where V 0 is a constituent fiber diameter of the non-woven fabric obtained from a nozzle piece having the same hole diameter. And V is the unbiased dispersion value of the constituent fiber diameter of the nonwoven fabric.) The second invention of the present invention relates to a nozzle piece having circular nozzle holes perforated in a line at the tip of a die. A nozzle piece in which two to four rows of nozzle holes B having a hole diameter Db smaller than the nozzle hole A are inserted and disposed between adjacent nozzle holes A having a hole diameter Da. The ratio R (Da / Db) of the pore diameter of B is A meltblown nonwoven nozzle piece is .3～2.0.
【０００８】[0008]
１．ノズルピース 熱可塑性樹脂のメルトブロー法不織布は、通常、第１図
に示すような断面図を有するダイを用い、ダイ先端部の
ノズルピース１に一列に穿孔された多数のノズル孔から
吐出された溶融ポリマーがエアスリットからの高温気流
中で紡糸され、極細繊維からなる熱可塑性樹脂の不織布
を形成して製造されており、この方法によって得られた
メルトブロー不織布の繊維径分布は狭いのが特徴であ
る。1. Nozzle piece Melt-blowing non-woven fabric of thermoplastic resin is usually formed by using a die having a cross-sectional view as shown in FIG. 1, and the melt discharged from a number of nozzle holes formed in a row in a nozzle piece 1 at the tip of the die. The polymer is spun in a high-temperature air flow from an air slit to form a thermoplastic resin nonwoven fabric made of ultrafine fibers, and is manufactured by this method.The melt-blown nonwoven fabric obtained by this method is characterized by a narrow fiber diameter distribution. .
【０００９】本発明のメルトブロー不織布用ノズルピー
スは、メルトブロー時に、紡糸繊維の径を変え、直径の
異なる１〜１０ミクロンの繊維が適度に混合分散した不
織布を同時一体的に形成し、得られる不織布の繊維径分
布を広げることができるノズルピースである。すなわ
ち、第１図に示すダイのノズルピース部分において、第
２図に示すように、その先端部に一列に一定間隔に穿孔
された多数の孔径Ｄａの円形ノズル孔Ａの間に、ノズル
孔Ａよりも孔径の小さい孔径Ｄｂのノズル孔Ｂのｎ個の
列を挿入したノズルピースである。ただし、これらの孔
の中心間距離、いわゆるピッチ間隔は隣接する同孔径同
士Ａ−ＡおよびＢ−Ｂの間では等しいものとする。上記
のノズル孔Ｂの挿入個数ｎは、２〜４の範囲である。ｎ
が２個未満であると、得られるメルトブロー不織布の繊
維径分布は広がらず、ｎが４個を超えるとスムーズな繊
維形成が行われない。The nozzle piece for melt-blown nonwoven fabric of the present invention provides a nonwoven fabric obtained by simultaneously forming a nonwoven fabric in which the diameters of spun fibers are changed and the fibers having different diameters are appropriately mixed and dispersed during meltblowing. This is a nozzle piece that can broaden the fiber diameter distribution. That is, in the nozzle piece portion of the die shown in FIG. 1, as shown in FIG. 2, a nozzle hole A is provided between a plurality of circular nozzle holes A having a hole diameter Da formed in a row at a constant interval at a tip end thereof. This is a nozzle piece in which n rows of nozzle holes B having a hole diameter Db smaller than the hole diameter are inserted. However, the center-to-center distance of these holes, that is, the so-called pitch interval, is assumed to be equal between adjacent holes AA and BB. The number n of the nozzle holes B to be inserted is in the range of 2 to 4. n
If the number is less than 2, the fiber diameter distribution of the obtained melt-blown nonwoven fabric does not spread, and if the number n exceeds 4, smooth fiber formation is not performed.
【００１０】また、両ノズル孔Ａ，Ｂの孔径比Ｒ（Ｄａ
／Ｄｂ）は、１．３〜２．０の範囲である。孔径比Ｒが
１．３未満であると、繊維径分布が広がらず、孔径比Ｒ
が２．０を超えると孔径の大小差に基づく樹脂の吐出バ
ランスがくずれ、安定した紡糸状態が得られずショット
が発生するので好ましくない。さらに、ノズル孔Ａの孔
径Ｄａは、０．３０〜１．００ｍｍであり、ノズル孔Ｂ
の孔径Ｄｂは、０．２０〜０．８０ｍｍである。Ｄｂが
０．２０ｍｍ未満の場合、機械工作上の困難さを伴うた
め好ましくなく、またＤａが１．００ｍｍを超えると細
い繊維が得にくく、また粗大化した繊維が１０ミクロン
を超えるため本発明の目的からはずれる。In addition, a hole diameter ratio R (Da) of both nozzle holes A and B
/ Db) is in the range of 1.3 to 2.0. If the pore diameter ratio R is less than 1.3, the fiber diameter distribution does not spread, and the pore diameter ratio R
Is more than 2.0, the discharge balance of the resin based on the difference in the hole diameter is lost, and a stable spinning state cannot be obtained, and a shot is generated. Further, the hole diameter Da of the nozzle hole A is 0.30 to 1.00 mm,
Has a hole diameter Db of 0.20 to 0.80 mm. When Db is less than 0.20 mm, it is not preferable because it involves difficulties in machining, and when Da exceeds 1.00 mm, it is difficult to obtain fine fibers, and since coarse fibers exceed 10 microns, the present invention has Depart from purpose.
【００１１】２．メルトブロー不織布 本発明のメルトブロー不織布は、前記ノズルピースを有
したメルトブロー用不織布ダイを用いて製造され、繊維
径が１〜１０μｍで、繊維径分散比Ｆが２以上である平
面的にも立体的にも繊維径分布の広い単一のメルトブロ
ー不織布である。一般に、同一孔径ノズルを有するダイ
から得られるメルトブロー不織布の繊維径分布は、図３
（Ａ）に示すような狭い正規分布をもっている。本発明
のメルトブロー不織布は、同一孔径のノズルを有するノ
ズルピースの孔の間にそれより小さな孔径の特定数のノ
ズル孔列を挿入配置したノズルピースを用いることによ
って、従来の狭い繊維径分布を持つメルトブロー不織布
に比べて、図３（Ｂ）のような広がった繊維径分布を持
つメルトブロー不織布を得ることができる。2. Meltblown nonwoven fabric The meltblown nonwoven fabric of the present invention is manufactured using a meltblown nonwoven die having the nozzle piece, and has a fiber diameter of 1 to 10 μm and a fiber diameter dispersion ratio F of 2 or more. Is also a single meltblown nonwoven fabric with a wide fiber diameter distribution. Generally, the fiber diameter distribution of a melt blown nonwoven fabric obtained from a die having the same hole diameter nozzle is shown in FIG.
It has a narrow normal distribution as shown in FIG. The melt-blown nonwoven fabric of the present invention has a conventional narrow fiber diameter distribution by using a nozzle piece in which a specific number of nozzle hole rows having a smaller hole diameter is inserted and arranged between the holes of a nozzle piece having a nozzle of the same hole diameter. Compared with the melt-blown nonwoven fabric, a melt-blown nonwoven fabric having an expanded fiber diameter distribution as shown in FIG. 3B can be obtained.
【００１２】すなわち、繊維径分散比Ｆが２以上である
平面的にも立体的にも繊維径分布の広い極細繊維よりな
る単一のメルトブロー不織布であり、この不織布は、液
体フィルターなどに応用したとき、微少な粒子を補集で
き、補集した粒子による目詰まりが起こりにくく、濾過
の精度の高い、且つ濾過寿命の長い液体フィルターとな
る。また、接着剤等を使用しておらず、加工による不織
布の変質や使用時の層間剥離などを伴うことがなく、品
質保持の観点からも優れた液体フィルターとなる。That is, it is a single melt-blown nonwoven fabric made of ultrafine fibers having a fiber diameter distribution ratio F of 2 or more and having a wide fiber diameter distribution both planarly and three-dimensionally, and this nonwoven fabric is applied to liquid filters and the like. At this time, fine particles can be collected, clogging by the collected particles hardly occurs, and a liquid filter having high filtration accuracy and a long filtration life can be obtained. In addition, since no adhesive or the like is used, the nonwoven fabric does not deteriorate due to processing or delamination during use.
【００１３】本発明のメルトブロー不織布に適する熱可
塑性樹脂としては、ポリオレフィン、ポリアミド、ポリ
アクリルニトリル、ポリエステル、スチレン−ポリオレ
フィン共重合体、フッソ樹脂、ポリアリーレンスルフィ
ド等が挙げられ、さらに、これらの樹脂をポリマー骨格
とする共重合体またはブレンド体も適用できる。これら
の樹脂の内、ポリオレフィンであるポリプロピレンが好
ましく用いられる。また、これらの樹脂には必要に応じ
て、染料、添加剤、変性剤、無機フィラー等を配合する
ことができる。The thermoplastic resin suitable for the melt-blown nonwoven fabric of the present invention includes polyolefin, polyamide, polyacrylonitrile, polyester, styrene-polyolefin copolymer, fluorine resin, polyarylene sulfide, and the like. A copolymer or a blend having a polymer skeleton can also be applied. Of these resins, polypropylene, which is a polyolefin, is preferably used. In addition, a dye, an additive, a modifier, an inorganic filler, and the like can be added to these resins as needed.
【００１４】３．不織布の製造 本発明の繊維径分布の広いメルトブロー不織布は、上記
のノズルピースを有するダイを用いて製造されるが、上
記熱可塑性樹脂を単軸押出機又は２軸押出機を経て本発
明のダイに導入され、孔径の異なるノズルを配置した複
数のオリフィスから吐出され、高速空気で延伸されて、
１〜５０ｍ／分の速度にて移動しているコンベア上のス
クリーンに捕集されメルトブロー不織布を形成する。コ
ンベア速度とダイからの樹脂の吐出量により不織布の目
付重量と、厚みが設定される。3. Production of Nonwoven Fabric The melt-blown nonwoven fabric of the present invention having a wide fiber diameter distribution is produced by using a die having the above-mentioned nozzle piece, and the thermoplastic resin is passed through a single-screw extruder or a twin-screw extruder to form the die of the present invention. Is discharged from a plurality of orifices in which nozzles with different hole diameters are arranged and stretched by high-speed air.
It is collected on a screen on a conveyor moving at a speed of 1 to 50 m / min to form a meltblown nonwoven fabric. The basis weight and thickness of the nonwoven fabric are set according to the conveyor speed and the amount of resin discharged from the die.
【００１５】[0015]
【実施例】本発明を以下の実施例、比較例にて詳細に説
明する。なお、評価方法については以下の方法を用い
た。 （１）平均繊維径：得られた不織布の繊維径を走査型電
子顕微鏡にて１０００倍の写真画像を得、これより無作
為に抽出した３０本の繊維径を測定して求めた。The present invention will be described in detail with reference to the following examples and comparative examples. The following evaluation method was used. (1) Average fiber diameter: The fiber diameter of the obtained nonwoven fabric was obtained by obtaining a 1000-fold photographic image with a scanning electron microscope, and measuring the fiber diameter of 30 fibers randomly extracted from the image.
【００１６】（２）繊維径分散比Ｆ：比較例１の不織布
の繊維径のバラツキの尺度として不偏分散値Ｖ0を求
め、同じく実施例にて得られた不織布の繊維径の不偏分
散値をＶとし、両者の比をとり、Ｆ検定にて（Ｆ＝２．
０：Ｆ分布より自由度φ0，φ1＝３０、９７．５％信頼
区間から引用）有意差検定を行った。(2) Fiber diameter dispersion ratio F: The unbiased dispersion value V 0 was determined as a measure of the fiber diameter dispersion of the nonwoven fabric of Comparative Example 1, and the fiber diameter unbiased dispersion value of the nonwoven fabric obtained in the same example was calculated. V, take the ratio of the two, and use the F test (F = 2.
0: degrees of freedom φ 0 , φ 1 = 30, quoted from 97.5% confidence interval based on F distribution) Significant difference test was performed.
【００１７】（３）繊維径分布：繊維径分散比ＦをＦ＝
Ｖ／Ｖ0とし、このＦと有意差判定値２．０を超えた場
合を分布が広がったと判定した。(3) Fiber diameter distribution: The fiber diameter dispersion ratio F is represented by F =
V / V 0, and the distribution was determined to have spread when the difference between the F and the significant difference determination value 2.0 was exceeded.
【００１８】（４）ショット：任意に１０ｃｍ角の原反
を目視観察し、目視で判定できる大きさのショットの数
が３個以上の場合を多いと判断した。(4) Shot: A 10 cm square raw material was arbitrarily visually observed, and it was judged that the number of shots of a size that could be visually judged was three or more in many cases.
【００１９】（５）濾過効果：不織布の濾過性能を次の
液体フィルター評価装置を用い、微粒子の懸濁液を濾過
させたとき、圧力損失が１ｋｇ／ｃｍ2になるまでに流
れた総流量（リットル）をもって判定した。 測定装置：ＡＤＶＡＮＴＥＣ社製ＴＳＵ−４７Ｂ型液体
フィルター評価装置 微粒子：ＪＩＳ１１種 通液速度：５００ｃｃ／分（一定）(5) Filtration effect: The filtration performance of the non-woven fabric was measured using the following liquid filter evaluation device, and when the suspension of fine particles was filtered, the total flow rate until the pressure loss became 1 kg / cm 2 ( Liter). Measuring device: TSU-47B type liquid filter evaluation device manufactured by ADVANTEC Fine particles: JIS11 type Flow rate: 500 cc / min (constant)
【００２０】比較例１ メルトフローレート（ＭＦＲ）が４０のポリプロピレン
樹脂を下記の押出機、ノズルピース、不織布製造装置、
によって加熱溶融し、ダイに導入し、多数に配列したノ
ズルから高温高速の気流中に吹き出し、押し出した樹脂
を繊維状にし、これをコンベア上に集積し、繊維同志の
自己接着により、平均繊維径５．５μｍ、目付６０ｇ／
ｍ2のメルトブロー不織布を形成した。不織布形成時の
ショットの生成についても観察した。次に、得られた不
織布を液体フィルタとして用いた場合の濾過性能試験を
行った。その結果を表１に示す。Comparative Example 1 A polypropylene resin having a melt flow rate (MFR) of 40 was extruded using the following extruder, nozzle piece, nonwoven fabric manufacturing apparatus,
The resin is heated and melted, introduced into a die, blown out from a large number of nozzles into a high-temperature, high-speed air stream, and the extruded resin is formed into a fibrous form, which is accumulated on a conveyor. 5.5 μm, basis weight 60 g /
A melt blown nonwoven fabric of m 2 was formed. The generation of shots during the formation of the nonwoven fabric was also observed. Next, a filtration performance test was performed when the obtained nonwoven fabric was used as a liquid filter. Table 1 shows the results.
【００２１】不織布製造装置 （１）押出機：池貝鉄工社製単軸押出機で、スクリュー
径５０ｍｍ。 （２）ノズルピース：第１図に示すダイ構造において、
エアスリット幅ｔ＝０．２０ｍｍ、ノズル先端角θ＝６
０度、エアリップ開度ｗ＝０．４ｍｍ、孔径（Ｄａ）＝
０．４ｍｍのノズル孔を有し、ノズル孔は１インチあた
りに３０孔一直線上に配列し、全長が２５０ｍｍの幅を
有する。 （３）コンベア：コンベア上のスクリーンは１〜５０ｍ
／分の速度にて移動しつつ、繊維を補足し不織布を形成
する。 Nonwoven fabric manufacturing apparatus (1) Extruder: A single screw extruder manufactured by Ikegai Iron Works Co., Ltd., having a screw diameter of 50 mm. (2) Nozzle piece: In the die structure shown in FIG.
Air slit width t = 0.20 mm, nozzle tip angle θ = 6
0 degree, air lip opening w = 0.4 mm, hole diameter (Da) =
It has a nozzle hole of 0.4 mm, the nozzle holes are arranged in a line of 30 holes per inch, and have a total length of 250 mm. (3) Conveyor: The screen on the conveyor is 1 to 50 m
While moving at a speed of / min, the fibers are captured to form a nonwoven fabric.
【００２２】不織布製造装置運転条件 押し出し機バレル温度 ３２０℃ スクリュ回転数 ４０ｒｐｍ 吐出量 ５ｋｇ／時 ダイ温度 ２９０℃ ダイ−スクリーン距離 ２００ｍｍ 空気温度 ２８０℃ 空気流量 ５Ｎｍ3／分 Operating conditions of nonwoven fabric manufacturing equipment Extruder barrel temperature 320 ° C. Screw rotation speed 40 rpm Discharge rate 5 kg / h Die temperature 290 ° C. Die-screen distance 200 mm Air temperature 280 ° C. Air flow rate 5 Nm 3 / min
【００２３】実施例１ 比較例１において、ノズルピースとして、孔径Ｄａ＝
０．６ｍｍのノズル孔Ａを有し、２個の孔径Ｄｂ＝０．
４ｍｍのノズル孔Ｂがノズル孔Ａの間に配列したノズル
ピースを用いる以外は、比較例１と同様にして、平均繊
維径５．６μｍの不織布を得た。得られた不織布を比較
例１と同様の方法で繊維径を測定し、その分布を求め
た。また、実施例１で得た不織布の繊維径の分布を比較
例のそれと比較するために、比較例１の繊維径のバラツ
キの尺度として繊維径分散比Ｆを求め、繊維径分布の差
を判定した。不織布成形時のショットの数の評価及び得
られた不織布の濾過性能について比較例１と同様にして
評価を行った。その結果を表１示す。Example 1 In Comparative Example 1, the nozzle piece was provided with a hole diameter Da =
It has a nozzle hole A of 0.6 mm and two hole diameters Db = 0.
A non-woven fabric having an average fiber diameter of 5.6 μm was obtained in the same manner as in Comparative Example 1, except that a nozzle piece in which a 4 mm nozzle hole B was arranged between the nozzle holes A was used. The fiber diameter of the obtained nonwoven fabric was measured in the same manner as in Comparative Example 1, and the distribution was determined. In addition, in order to compare the fiber diameter distribution of the nonwoven fabric obtained in Example 1 with that of the comparative example, the fiber diameter dispersion ratio F was determined as a measure of the fiber diameter variation of Comparative Example 1, and the difference in the fiber diameter distribution was determined. did. The evaluation of the number of shots during the formation of the nonwoven fabric and the filtration performance of the obtained nonwoven fabric were performed in the same manner as in Comparative Example 1. Table 1 shows the results.
【００２４】実施例２〜３、比較例２〜５ 比較例１において、ノズルピースとして、孔径Ｄａのノ
ズル孔Ａ及び孔径Ｄｂのノズル孔Ｂ、孔径比Ｒ（Ｄａ／
Ｄｂ）、ノズル孔Ｂの個数（ｎ）を表１に示すものを用
いる以外は、比較例１と同様にして、不織布を得た。得
られた不織布を比較例１と同様の方法で繊維径を測定
し、実施例１と同様の方法で、その分布を求めた。ま
た、比較例１及び実施例１と同様に得られた不織布の性
能評価を行った。その結果を表１に示す。Examples 2 to 3 and Comparative Examples 2 to 5 In Comparative Example 1, as nozzle pieces, a nozzle hole A having a hole diameter Da, a nozzle hole B having a hole diameter Db, and a hole diameter ratio R (Da /
Db) and a nonwoven fabric were obtained in the same manner as in Comparative Example 1 except that the number (n) of the nozzle holes B shown in Table 1 was used. The fiber diameter of the obtained nonwoven fabric was measured in the same manner as in Comparative Example 1, and the distribution was determined in the same manner as in Example 1. In addition, the performance of the nonwoven fabric obtained in the same manner as in Comparative Example 1 and Example 1 was evaluated. Table 1 shows the results.
【００２５】[0025]
【表１】 [Table 1]
【００２６】表１から明らかなように、同一ノズル孔Ａ
のみの従来のノズルピースを用いた場合（比較例１）に
比較して、ノズル孔径比が本発明の範囲の小さい孔径の
ノズル孔Ｂが２〜４個挿入されたノズルピースを用いた
場合、得られる不織布は繊維径分布が広がり、液体フィ
ルタとしての濾過効率が優れている（実施例１〜３）。
一方、ノズル孔径比が１．２と本発明の範囲を下回る孔
径Ｄｂのノズル孔Ｂを挿入配置したノズルピースを用い
ると得られた不織布の繊維径分布は広がらず、液体フィ
ルタとしての濾過効率は劣る（比較例２）。また、ノズ
ル孔Ｂの挿入個数が多くなると、得られた不織布の繊維
径分布は広がらず、液体フィルタとしての濾過効率は劣
る（比較例３）。さらに、ノズル孔Ｂの挿入個数が少な
過ぎると、繊維径分布は広がらず、液体フィルタとして
の濾過効率は劣り（比較例４）、ノズル孔径比が大き過
ぎると、隣接する孔径の差による樹脂の吐出量の差が大
きくなり、溶融紡糸状態のバランスが崩れ、ショットが
顕著になり、液体フィルタとして用いることができない
（比較例５）。As is clear from Table 1, the same nozzle hole A
Compared to the case where only the conventional nozzle piece is used (Comparative Example 1), the case where the nozzle piece in which 2 to 4 nozzle holes B having the smaller hole diameters in the range of the present invention are inserted is used, The obtained nonwoven fabric has a wide fiber diameter distribution and is excellent in filtration efficiency as a liquid filter (Examples 1 to 3).
On the other hand, if a nozzle piece having a nozzle hole diameter ratio of 1.2, which is smaller than the range of the present invention, and a nozzle hole B having a hole diameter Db that is less than the range of the present invention is used, the fiber diameter distribution of the obtained nonwoven fabric does not spread, and the filtration efficiency as a liquid filter is reduced Inferior (Comparative Example 2). Further, when the number of inserted nozzle holes B increases, the fiber diameter distribution of the obtained nonwoven fabric does not widen, and the filtration efficiency as a liquid filter deteriorates (Comparative Example 3). Further, if the number of inserted nozzle holes B is too small, the fiber diameter distribution does not widen, and the filtration efficiency as a liquid filter is inferior (Comparative Example 4). If the nozzle hole diameter ratio is too large, resin The difference in the discharge amount becomes large, the balance of the melt-spinning state is lost, and the shot becomes remarkable, so that it cannot be used as a liquid filter (Comparative Example 5).
【００２７】[0027]
【発明の効果】本発明のメルトブロー用ノズルピースを
用いて得られたメルトブロー不織布は、メルトブロー時
に紡糸繊維の径を変えて、直径の異なる１〜１０ミクロ
ンの繊維が適度に混合分散した不織布が同時一体的に形
成された不織布である。これによって、構成繊維径分布
の広い不織布を得ることが可能となり、繊維径の異なる
別個の不織布を積層張り合わせたものと同様の濾過性能
を有するフィルター素材を効率良く製造することができ
る。The melt-blown non-woven fabric obtained by using the melt-blown nozzle piece of the present invention is obtained by changing the diameter of the spun fiber at the time of melt-blowing and simultaneously mixing and dispersing fibers of 1 to 10 microns having different diameters. It is a nonwoven fabric formed integrally. As a result, it is possible to obtain a nonwoven fabric having a wide constituent fiber diameter distribution, and it is possible to efficiently produce a filter material having the same filtration performance as that obtained by laminating and bonding separate nonwoven fabrics having different fiber diameters.
【図１】メルトブローダイの断面図FIG. 1 is a cross-sectional view of a melt blow die.
【図２】メルトブローダイのノズルピースのノズル孔部
分図FIG. 2 is a partial view of a nozzle hole of a nozzle piece of a melt blow die.
【図３】メルトブロー不織布の繊維径分布図FIG. 3 is a fiber diameter distribution diagram of a melt blown nonwoven fabric.
１ ノズルピース ２ エアリップ Ａ，Ｂ ノズル孔 ｔ エアスリット ｗ エアリップ開度 θ ノズル先端角度 1 Nozzle piece 2 Air lip A, B Nozzle hole t Air slit w Air lip opening θ Nozzle tip angle
Claims (2)
ル孔を有するノズルピースにおいて、隣接する孔径Ｄａ
のノズル孔Ａの間に、ノズル孔Ａより孔径が小さい孔径
Ｄｂのノズル孔Ｂのｎ個の列を挿入配置したメルトブロ
ー不織布用ノズルピースを用いて得られる繊維径が１〜
１０μｍで、次式で表される繊維径分散比Ｆが２以上で
ある平面的にも立体的にも繊維径分布の広い極細繊維よ
りなる単一のメルトブロー不織布。 繊維径分散比Ｆ＝Ｖ／Ｖ0 （式中、Ｖ0は同一孔径の孔を有するノズルピースより
得られた不織布の構成繊維径の不偏分散値であり、Ｖは
当該不織布の構成繊維径の不偏分散値である。）In a nozzle piece having a circular nozzle hole perforated in a line at a tip end portion of a die, an adjacent hole diameter Da is provided.
The fiber diameter obtained using a nozzle piece for a melt-blown nonwoven fabric in which n rows of nozzle holes B having a hole diameter Db smaller than the nozzle hole A are inserted and arranged between the nozzle holes A is 1 to 1.
A single melt-blown nonwoven fabric made of ultrafine fibers having a fiber diameter distribution ratio F represented by the following formula of 2 or more and having a wide fiber diameter distribution both planarly and three-dimensionally. Fiber diameter dispersion ratio F = V / V 0 (where V 0 is the unbiased dispersion value of the constituent fiber diameters of the nonwoven fabric obtained from the nozzle piece having the same hole diameter, and V is the constituent fiber diameter of the nonwoven fabric. It is an unbiased variance value.)
ル孔を有するノズルピースにおいて、隣接する孔径Ｄａ
のノズル孔Ａの間に、ノズル孔Ａより孔径が小さい孔径
Ｄｂのノズル孔Ｂの２〜４個の列を挿入配置したノズル
ピースであって、ノズル孔Ａの孔径とノズル孔Ｂの孔径
の比Ｒ（Ｄａ／Ｄｂ）が１．３〜２．０であるメルトブ
ロー不織布用ノズルピース。2. A nozzle piece having a circular nozzle hole perforated in a line at a tip end portion of a die, wherein an adjacent hole diameter Da
A nozzle hole in which two to four rows of nozzle holes B having a hole diameter Db smaller than the nozzle hole A are inserted and arranged between the nozzle holes A, wherein the hole diameter of the nozzle hole A and the hole diameter of the nozzle hole B are A nozzle piece for a melt-blown nonwoven fabric having a ratio R (Da / Db) of 1.3 to 2.0.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31261797A JP3753522B2 (en) | 1997-10-29 | 1997-10-29 | Melt blown nonwoven fabric and nozzle piece for melt blown nonwoven fabric |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31261797A JP3753522B2 (en) | 1997-10-29 | 1997-10-29 | Melt blown nonwoven fabric and nozzle piece for melt blown nonwoven fabric |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11131353A true JPH11131353A (en) | 1999-05-18 |
| JP3753522B2 JP3753522B2 (en) | 2006-03-08 |
Family
ID=18031366
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31261797A Expired - Lifetime JP3753522B2 (en) | 1997-10-29 | 1997-10-29 | Melt blown nonwoven fabric and nozzle piece for melt blown nonwoven fabric |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3753522B2 (en) |
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- 1997-10-29 JP JP31261797A patent/JP3753522B2/en not_active Expired - Lifetime
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