JP2002371427A - Spinning die for melt-blow type nonwoven fabric - Google Patents
Spinning die for melt-blow type nonwoven fabricInfo
- Publication number
- JP2002371427A JP2002371427A JP2001180145A JP2001180145A JP2002371427A JP 2002371427 A JP2002371427 A JP 2002371427A JP 2001180145 A JP2001180145 A JP 2001180145A JP 2001180145 A JP2001180145 A JP 2001180145A JP 2002371427 A JP2002371427 A JP 2002371427A
- Authority
- JP
- Japan
- Prior art keywords
- spinning
- nozzle
- slits
- pair
- spinning die
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
- Nonwoven Fabrics (AREA)
Abstract
Description
【０００１】[0001]
【発明の技術分野】この発明は、不織布をメルトブロー
法で製造する際に用いる紡糸ダイに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spinning die used for producing a nonwoven fabric by a melt blow method.
【０００２】[0002]
【従来の技術】メルトブロー法は、概略図５に示すよう
に、ホッパー１に投入された原料チップを押出機２で加
熱溶融し、ダイ３に供給して紡出し、紡出した短繊維を
捕集ネットから成るコンベア４上にシート状に堆積さ
せ、これをコンベア４から剥離しながら、カレンダロー
ル５を通過させた後、巻取機６で巻き取って不織布を製
造する方法である。2. Description of the Related Art In a melt blow method, as shown in FIG. 5, a raw material chip put into a hopper 1 is heated and melted by an extruder 2, supplied to a die 3 and spun out, and the spun short fibers are caught. This is a method in which a sheet is deposited on a conveyor 4 made of a collecting net, passed through a calendar roll 5 while being separated from the conveyor 4, and then wound up by a winder 6 to produce a nonwoven fabric.
【０００３】[0003]
【発明の課題】上記ダイ３は、紡糸口３ａから吐出され
た溶融ポリマーを熱風吐出口３ｂから噴出した高温エヤ
ーで紡出するようになっているが、紡糸口３ａからの溶
融ポリマーの吐出量と高温エヤーの吐出量に微妙なバラ
ンスが必要であって、任意の径の繊維を紡出すること、
特に細い径の繊維を紡出することが難しく、バルキー性
の高い風合の良い不織布を得ることが出来なかった。さ
らに、多量の熱風を送る必要があるため、エネルギーコ
ストが高くつく問題があった。The die 3 spins the molten polymer discharged from the spinning port 3a by a high-temperature air blown from the hot air discharging port 3b. The discharge amount of the molten polymer from the spinning port 3a is controlled. It is necessary to finely balance the discharge amount of high-temperature air with that of spinning fiber of any diameter.
In particular, it is difficult to spin a fiber having a small diameter, and a nonwoven fabric having a high bulkiness and a good feel cannot be obtained. In addition, there is a problem that a large amount of hot air needs to be sent, resulting in high energy costs.
【０００４】そこで本発明者は、溶融ポリマーを押し出
すノズルの先端近辺に、熱風吐出スリットを配置し、そ
の下流に大量の冷風を吐出するスリットを配置して溶融
ポリマーを延伸するようにした紡糸ダイを提案している
（特開２０００−３３６５１７号公報）。このような紡
糸ダイを用いると細径の繊維より成るバルキー性の高い
不織布が得られることが確認されているが、冷風吐出ス
リットの吐出端直下に、急激な冷風吐出によって渦流が
生じ、紡出された繊維表面に渦流の影響で凹凸が生じ、
時には紡出口に引掛り、紡糸効率を低下させる問題が生
じている。Accordingly, the present inventor has proposed a spinning die in which a hot air discharge slit is disposed near the tip of a nozzle for extruding a molten polymer, and a slit for discharging a large amount of cold air is disposed downstream of the slit to draw the molten polymer. (Japanese Patent Laid-Open No. 2000-336517). Using such a spinning die, it has been confirmed that a nonwoven fabric having a high bulky property composed of small-diameter fibers can be obtained. Irregularities are generated on the surface of the fiber under the influence of eddy current,
At times, there is a problem that the fiber is caught at the spinning outlet and the spinning efficiency is reduced.
【０００５】この発明の課題は、前記渦流の発生を防止
し、滑らかな表面を有する繊維を効率よく紡出すること
ができる紡糸ダイを提供することである。[0005] It is an object of the present invention to provide a spinning die capable of preventing the generation of the vortex and efficiently spinning a fiber having a smooth surface.
【０００６】[0006]
【課題の解決手段】上記の課題を解決するために、この
発明は、溶融ポリマーを押し出すノズルの先端近辺に、
一対の熱風吐出スリットを前記ノズルを中心に対向配置
し、この冷風吐出スリットの下流に一対の冷風吐出スリ
ットを前記ノズルを中心に対向配置した紡糸ダイにおい
て、前記冷風が吐出する紡出口の内端部に通気スリット
又は通気孔列を対向して設けたことを特徴とする。前記
冷風吐出スリットの吐出風量を熱風吐出スリットよりも
大にしておくのがよい。また、前記熱風吐出スリットと
冷風吐出スリットとの間に、外気に通じる一対のスリッ
トを前記ノズルを中心に対向配置しておくのが好まし
い。In order to solve the above problems, the present invention provides a method for extruding a molten polymer near the tip of a nozzle for extruding a molten polymer.
In a spinning die in which a pair of hot air discharge slits are disposed opposite to each other around the nozzle and a pair of cold air discharge slits are disposed downstream of the cool air discharge slit around the nozzle, an inner end of a spinning outlet from which the cool air is discharged. A ventilation slit or a row of ventilation holes is provided opposite to the portion. It is preferable that the discharge amount of the cool air discharge slit is larger than that of the hot air discharge slit. In addition, it is preferable that a pair of slits communicating with the outside air is disposed between the hot air discharge slit and the cold air discharge slit so as to face each other around the nozzle.
【０００７】[0007]
【実施の形態】以下、この発明の実施形態を図１乃至図
４に基づいて説明する。図示のように、紡糸パック１０
の下端に紡糸ダイ２０が取り付けられている。紡糸パッ
ク１０は、２分割された本体１１ａ、１１ｂをボルト１
２で結合したものであって、本体１１ａ、１１ｂの上部
には、ポリプロピレン樹脂、ポリエステル樹脂、ナイロ
ン（商標）樹脂等の溶融ポリマーの注入口１３が設けら
れ、下部には熱風の送入口１４ａ、１４ｂが設けられて
いる。また、側面には、押え板１６ａ、１６ｂによっ
て、パネルヒーター１５ａ、１５ｂが当接している。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. As shown, the spin pack 10
A spinning die 20 is attached to the lower end of the spinneret. The spinning pack 10 includes a main body 11a, 11b divided into two parts and a bolt 1
2, an injection port 13 of a molten polymer such as a polypropylene resin, a polyester resin, or a nylon (trademark) resin is provided at an upper portion of the main bodies 11a and 11b, and a hot air inlet 14a is provided at a lower portion. 14b is provided. Panel heaters 15a and 15b are in contact with the side surfaces by holding plates 16a and 16b.
【０００８】前記紡糸ダイ２０には、前記ポリマー注入
口１３に続くポリマー通路１７の先端に複数のノズル２
１が一列に設けられ、このノズル２１の先端２１ａは、
熱風室２２ａ、２２ｂからの熱風を吐出する対向配置さ
れた一対の吐出スリット２３ａ、２３ｂの中央に臨んで
いる。また、前記熱風室２２ａ、２２ｂは前記熱風送入
口１４ａ、１４ｂに通路２４ａ、２４ｂを介して連通し
ている。The spinning die 20 has a plurality of nozzles 2 at the tip of a polymer passage 17 following the polymer injection port 13.
1 are provided in a line, and the tip 21a of the nozzle 21 is
It faces the center of a pair of discharge slits 23a and 23b which are disposed opposite to each other and discharge hot air from the hot air chambers 22a and 22b. The hot air chambers 22a and 22b communicate with the hot air inlets 14a and 14b via passages 24a and 24b.
【０００９】前記熱風吐出スリット２３ａ、２３ｂから
一定の間隔Ｓ1 をあけて、冷風室２５ａ、２５ｂと一対
の冷風吐出スリット２６ａ、２６ｂが前記ノズル２１を
中心に対向配置され、前記冷風室２５ａ、２５ｂは冷風
送入口２７ａ、２７ｂに連通している。そして冷風吐出
スリット２６ａ、２６ｂの前方は、紡出口２９になって
いる。また、間隔Ｓ1 は、ノズル２１の先端近辺に、外
気（随伴流）の吸引スリット２８ａ、２８ｂを形成して
いる。この間隔Ｓ1 は、２〜１０ｍｍ程度が好ましい。[0009] The hot air discharge slits 23a, at regular intervals S 1 from 23b, the cold air chamber 25a, 25b and a pair of cool air discharge slits 26a, 26b are opposed around the nozzle 21, the cold air chamber 25a, 25b communicates with the cool air inlets 27a, 27b. The front of the cold air discharge slits 26a and 26b is a spinning outlet 29. The interval S 1 forms suction slits 28 a and 28 b for the outside air (adjoining flow) near the tip of the nozzle 21. The spacing S 1 is about 2~10mm are preferred.
【００１０】図２に明瞭に示されているように、上記紡
出口２９の内端から一定の間隔Ｓ2をあけて紡出口２９
間と外気を連通する通気スリット３０ａ、３０ｂが紡出
口２９の全長にわたって対向して形成されている。この
間隔Ｓ2 は１〜１０ｍｍ程度が好ましい。また、図３に
示すように、通気スリット３０ａ、３０ｂに代えて通気
孔列３０ｃ、３０ｄを対向して設けてもよい。通気孔列
３０ｃ、３０ｄを形成する場合は、ダイ２０の長さ方向
に狭い間隔で多数の通気孔を設け、紡出口２９に開口す
る内端に、溝３１ａ、３１ｂを紡出口２９の全長にわた
って設けておくのがよい。[0010] As clearly shown in FIG. 2, spinning outlet 29 with an interval S 2 from the inner end fixed in the spinning outlet 29
Vent slits 30 a and 30 b for communicating the space and the outside air are formed to face each other over the entire length of the spinning outlet 29. The spacing S 2 about 1~10mm are preferred. As shown in FIG. 3, instead of the ventilation slits 30a and 30b, ventilation hole arrays 30c and 30d may be provided to face each other. When forming the air hole rows 30c and 30d, a large number of air holes are provided at narrow intervals in the longitudinal direction of the die 20 and grooves 31a and 31b are formed at the inner end opening to the spinning outlet 29 over the entire length of the spinning outlet 29. It is good to provide.
【００１１】いま、ノズル２１から溶融ポリマーを押し
出すと、溶融ポリマーの両側からその押し出し方向に傾
斜した一対の熱風吐出スリット２３ａ、２３ｂを通して
吹き出される熱風に挟まれるように引き出され、さらに
冷風吐出スリット２６ａ、２６ｂから冷風が大量に吐出
されるため、前記ノズル２１から押し出された溶融ポリ
マーが負圧で急激に吸引延伸されると同時に結晶化が進
行する。このとき、熱風の温度は２００〜３００℃、冷
風の温度は１０〜３０℃程度が好ましく、風量は冷風に
対して熱風が５〜２０％程度が好ましい。例えば冷風が
１００〜２５０ｍ／秒であると、熱風は５〜５０ｍ／秒
程度である。即ち、ここでは、熱風はノズル２１から押
し出された溶融ポリマーが急速に冷却しない程度に加熱
するだけでよく、冷風によって生じる負圧で急激に延伸
して細径繊維が形成される。そして冷風の急激な吐出に
よって、紡出口２９の内端付近で生じる渦流は通気スリ
ット３０ａ、３０ｂ又は通気孔列３０ｃ、３０ｄによっ
て消滅し、滑らかな表面を有する繊維が紡出される。な
お、冷風吐出スリット２６ａ、２６ｂも、熱風吐出スリ
ット２３ａ、２３ｂと同様に紡出口２９の方向に下降す
る傾斜をもたせておく。また、随伴流を生じるスリット
２８ａ、２８ｂを形成しておけば、風量の節減を果すこ
とができる。Now, when the molten polymer is extruded from the nozzle 21, the molten polymer is drawn out from both sides of the molten polymer so as to be sandwiched by the hot air blown out through a pair of hot air discharge slits 23a and 23b inclined in the direction of the extrusion. Since a large amount of cold air is discharged from the nozzles 26a and 26b, the molten polymer extruded from the nozzle 21 is rapidly drawn and drawn at a negative pressure, and at the same time, crystallization proceeds. At this time, the temperature of the hot air is preferably 200 to 300 ° C., the temperature of the cool air is preferably about 10 to 30 ° C., and the amount of the hot air is preferably about 5 to 20% of the cool air. For example, when the cool air is 100 to 250 m / sec, the hot air is about 5 to 50 m / sec. That is, in this case, the hot air only needs to be heated to such an extent that the molten polymer extruded from the nozzle 21 does not rapidly cool, and is rapidly drawn by the negative pressure generated by the cool air to form fine fibers. Then, the vortex generated near the inner end of the spinning outlet 29 by the rapid discharge of the cool air is extinguished by the ventilation slits 30a, 30b or the ventilation hole arrays 30c, 30d, and the fiber having a smooth surface is spun. The cool air discharge slits 26a and 26b are also inclined so as to descend in the direction of the spinning outlet 29 similarly to the hot air discharge slits 23a and 23b. In addition, if the slits 28a and 28b that generate the entrainment flow are formed, the air volume can be reduced.
【００１２】[0012]
【発明の効果】この発明によれば、以上のように、ノズ
ルで押し出した溶融ポリマーが冷却しない程度の少量の
熱風で加熱したものを、大量の冷風による負圧で延伸
し、その際に生じる渦流をなくするようにしたので、細
径で表面の滑らかな繊維が得られ、それによってバルキ
ー性の高い風合のよい不織布が得られる。According to the present invention, as described above, the molten polymer extruded by the nozzle is heated by a small amount of hot air not to be cooled, and is stretched by a negative pressure by a large amount of cold air. Since the swirl is eliminated, fibers having a small diameter and a smooth surface can be obtained, and thereby a nonwoven fabric having a high bulkiness and a good feel can be obtained.
【００１３】また、紡出口での繊維の引掛りなどがなく
なるため、従来より吐出ポリマーを多くすることができ
生産性が向上する。Further, since the fiber is not caught at the spinning outlet, the amount of the discharged polymer can be increased and the productivity can be improved.
【図１】この発明の紡糸ダイを組み込んだ紡糸パックを
示す横断面図FIG. 1 is a cross-sectional view showing a spinning pack incorporating a spinning die of the present invention.
【図２】紡糸ダイの拡大断面図FIG. 2 is an enlarged sectional view of a spinning die.
【図３】紡糸ダイの部分拡大断面図FIG. 3 is a partially enlarged sectional view of a spinning die.
【図４】紡糸ダイの斜視図FIG. 4 is a perspective view of a spinning die.
【図５】従来のメルトブロー法による不織布の製造方法
を示す一部横断概略線図FIG. 5 is a partial cross-sectional schematic diagram showing a conventional method for producing a nonwoven fabric by a melt blow method.
１ ホッパー ２ 押出機 ３ ダイ ３ａ 紡糸口 ３ｂ 熱風吐出口 ４ コンベア ５ カレンダロール ６ 巻取機 １０ 紡糸パック １１ａ、１１ｂ 本体 １２ ボルト １３ 注入口 １４ａ、１４ｂ 送入口 １５ａ、１５ｂ パネルヒーター １６ａ、１６ｂ 押え板 １７ 通路 ２０ 紡糸ダイ ２１ ノズル ２１ａ ノズルの先端 ２２ａ、２２ｂ 熱風室 ２３ａ、２３ｂ 熱風吐出スリット ２４ａ、２４ｂ 通路 ２５ａ、２５ｂ 冷風室 ２６ａ、２６ｂ 冷風吐出スリット ２７ａ、２７ｂ 冷風送入口 ２８ａ、２８ｂ 吸引スリット ２９ 紡出口 ３０ａ、３０ｂ 通気スリット ３０ｃ、３０ｄ 通気孔列 ３１ａ、３１ｂ 溝 Ｓ1 、Ｓ2 間隔DESCRIPTION OF SYMBOLS 1 Hopper 2 Extruder 3 Die 3a Spinneret 3b Hot air discharge port 4 Conveyor 5 Calendar roll 6 Winder 10 Spinning pack 11a, 11b Main body 12 Bolt 13 Inlet 14a, 14b Inlet 15a, 15b Panel heater 16a, 16b Holding plate 17 Passage 20 Spinning die 21 Nozzle 21a Nozzle tip 22a, 22b Hot air chamber 23a, 23b Hot air discharge slit 24a, 24b Passage 25a, 25b Cold air chamber 26a, 26b Cold air discharge slit 27a, 27b Cold air inlet 28a, 28b Suction slit 29 Spinning outlet 30a, 30b ventilation slits 30c, 30d vent columns 31a, 31b groove S 1, S 2 interval
Claims (3)
辺に、一対の熱風吐出スリットを前記ノズルを中心に対
向配置し、その下流に一対の冷風吐出スリットを前記ノ
ズルを中心に対向配置した紡糸ダイにおいて、前記冷風
が吐出する紡出口の内端部に通気スリット又は通気孔列
を設けたことを特徴とするメルトブロー式不織布の紡糸
ダイ。1. A spinning die in which a pair of hot air discharge slits is arranged near the tip of a nozzle for extruding a molten polymer around the nozzle, and a pair of cool air discharge slits are arranged downstream of the nozzle opposite to the nozzle. A spinning die for a melt-blown nonwoven fabric, wherein a vent slit or a row of vent holes is provided at an inner end of a spinning outlet from which the cool air is discharged.
吐出スリットの吐出風量よりも大にした請求項１に記載
のメルトブロー式不織布の紡糸ダイ。2. The melt-blowing nonwoven spinning die according to claim 1, wherein a discharge air volume of the cold air discharge slit is larger than a discharge air volume of the hot air discharge slit.
トの間に、外気に通じる一対のスリットを前記ノズルを
中心に対向配置した請求項１又は２に記載のメルトブロ
ー式不織布の紡糸ダイ。3. The melt-blowing type nonwoven fabric spinning die according to claim 1, wherein a pair of slits communicating with the outside air is disposed between the hot air discharge slit and the cold air discharge slit so as to face each other around the nozzle.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001180145A JP3550109B2 (en) | 2001-06-14 | 2001-06-14 | Melt blown nonwoven spinning die |
| CN 02122292 CN1270002C (en) | 2001-06-14 | 2002-06-04 | Spinning plate used in non-woven fabric production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001180145A JP3550109B2 (en) | 2001-06-14 | 2001-06-14 | Melt blown nonwoven spinning die |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002371427A true JP2002371427A (en) | 2002-12-26 |
| JP3550109B2 JP3550109B2 (en) | 2004-08-04 |
Family
ID=19020607
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001180145A Expired - Fee Related JP3550109B2 (en) | 2001-06-14 | 2001-06-14 | Melt blown nonwoven spinning die |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP3550109B2 (en) |
| CN (1) | CN1270002C (en) |
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-
2001
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2002
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| CN111850713A (en) * | 2020-08-04 | 2020-10-30 | 南通大学 | Split type double-groove melt-blowing die head for preparing superfine fibers |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1270002C (en) | 2006-08-16 |
| JP3550109B2 (en) | 2004-08-04 |
| CN1392297A (en) | 2003-01-22 |
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