JPS6330405B2 - - Google Patents
Info
- Publication number
- JPS6330405B2 JPS6330405B2 JP59223897A JP22389784A JPS6330405B2 JP S6330405 B2 JPS6330405 B2 JP S6330405B2 JP 59223897 A JP59223897 A JP 59223897A JP 22389784 A JP22389784 A JP 22389784A JP S6330405 B2 JPS6330405 B2 JP S6330405B2
- Authority
- JP
- Japan
- Prior art keywords
- slit
- spinneret
- cooling
- spinning
- slits
- 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
Links
- 238000001816 cooling Methods 0.000 claims description 24
- 239000012510 hollow fiber Substances 0.000 claims description 22
- 238000000034 method Methods 0.000 claims description 11
- 238000002074 melt spinning Methods 0.000 claims description 9
- 238000009987 spinning Methods 0.000 claims description 6
- 239000000835 fiber Substances 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 229920000642 polymer Polymers 0.000 description 3
- 239000004952 Polyamide Substances 0.000 description 1
- -1 Polyethylene terephthalate Polymers 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 229920001059 synthetic polymer Polymers 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
- Artificial Filaments (AREA)
Description
［技術分野］
本発明は偏心中空繊維の溶融紡糸方法に関する
ものである。さらに詳しくは、潜在捲縮能を有す
る偏心中空繊維の溶融紡糸方法の改良に関するも
のである。
［従来技術とその問題点］
一般に潜在捲縮能を有する繊維を得るには、い
わゆるバイメタル型もしくは偏心芯鞘型で代表さ
れる複合紡糸法、および紡糸糸条を急冷する非対
称冷却法が知られているが、本発明は後者のしか
も中空繊維に関するものである。
従来、非対称冷却法によつて、潜在捲縮性中空
繊維を得るための紡糸口金としては、第６図に平
面図として例示するように、紡糸口金本体１に複
数個のスリツト２を穿設したものが使用されてき
た。かかる紡糸口金を使用して、潜在捲縮能を有
する偏心中空繊維を得るに際しては、第６図の場
合、スリツトの巾Ｗが同じものであるがために、
冷却風によつて断面異方性をもたせようとして
も、冷却差による断面異方性はあまり期待できな
かつた。また、大きな断面異方性を得るために、
冷却風を強くすると、紡糸中に糸切れが多発し、
紡糸性が不良であつた。
そこで、たとえば特公昭56−29007号公報に記
載された発明のように、中空繊維の断面の一部分
を肉薄とした偏心中空繊維とし、その肉薄の部分
に冷却風をあてることが考えられた。つまり、第
７図に示すような、紡糸口金本体１に、同一の巾
のスリツト２ｃおよび２ｄを穿設し、スリツト２
ｃと２ｄとの間に切り欠き部分Ｓを設けた紡糸口
金を使用し、第８図に示すような切り欠き部分Ｓ
でのポリマ吐出量の少ない部分Ｔを肉薄とする偏
心中空繊維３を得て、肉薄部分Ｔに冷却風をあて
るのである。
しかし、この方法では、確かに偏心した中空繊
維は得られるが、得られた偏心中空繊維の肉薄部
分Ｔの範囲Ｒが狭いために、後述する測定法で測
定した潜在捲縮能１／ｄを、3.0以上とすること
ができないという欠点を有していた。
［発明の目的］
本発明の目的は、上記従来技術の問題点を克服
し、紡糸性が良好で、かつ潜在捲縮性能に優れた
偏心中空繊維を安定して得ることのできる溶融紡
糸方法を提供することにある。
［発明の構成］
上記目的を達成するため、本発明は、一方向か
らのみ流れる冷却風で冷却しながら中空繊維を溶
融紡糸するに際して、紡糸口金面に、実質的に同
一円周上に位置するように不連続なスリツトを穿
設することにより各孔を形成し、前記スリツトの
うち、冷却側のスリツトの巾Waと、反対側のス
リツトの巾Wbとの関係が1.2≦Wb／Wa≦2.0か
らなる紡糸口金で紡糸することを特徴とするもの
である。
以下、本発明を図面に基づいて具体的に説明す
る。
第１図〜第４図は、本発明に用いる紡糸口金の
吐出孔であるスリツトの形状の例を示す平面図で
ある。第５図は、本発明で得られた偏心中空繊維
の横断面図である。
第１図〜第４図において、１は紡糸口金本体、
２ａは冷却側、つまり冷却風の風上側のスリツ
ト、２ｂはその反対側つまり風下側のスリツトで
ある。４は一方向からのみ流れる冷却風である。
本発明においては、冷却側のスリツト２ａの巾
Waと、反対側のスリツト２ｂの巾Wbとの関係
を、1.2≦Wb／Wa≦2.0とする必要がある。すな
わち、冷却側のスリツト２ａの巾を狭くし、反対
側のスリツト２ｂの巾を広くするものである。
スリツト巾の比Wb／Waが1.2未満では、紡糸
して得られる中空繊維の断面異方性が小さいもの
となり、従来品の潜在捲縮能と変らないものとな
つてしまう。また、Wb／Waが2.0を越えると、
潜在捲縮能は大きくなり良好となるが、紡糸中や
紡糸後に肉薄部分が破れてパンクしたり、中空成
型が不良となつたりするからである。スリツト巾
Waは、0.08〜0.14mm、Wbは0.10〜0.24mmとする
ことが好ましい。
また、スリツト２ａ，２ｂは実質的にそのいず
れかの円周上に揃うように配置する必要がある。
ここで「実質的に」とは、各スリツト２ａ，２ｂ
を円周方向に結んでも、同一円周上からはみだす
スリツトが存在する場合、たとえば第４図に示す
ような半径の短い方のスリツトの外周半径r1に対
する半径の長い方のスリツトの内周半径r2の比
r2／r1を、1.05以下とすることをいう。
このような紡糸口金を使用して溶融紡糸する
と、第５図に示すような偏心した中空繊維３が安
定して得られる。ここで重要なのは、肉薄部分Ｔ
の範囲Ｒが第８図に示したＲよりも大きく、した
がつて後述するように潜在捲縮能１／ｄが大きい
ことである。
さらに偏心が助長された、すなわち上記Ｒがよ
り一層大きな偏心中空繊維を得るには、たとえば
特公昭56−29007号公報に示されているようなス
リツトの切り欠き部分Ｓを、第３図のように、本
発明のスリツト２ａに設けるとよい。
冷却側のスリツト２ａの長さは円周全体の長さ
の35〜60％、逆に反対側のスリツト２ｂの長さは
60〜35％が好ましいが、両者を各45〜55％とする
のがより好ましい。長さの割合が、この範囲を外
れると潜在捲縮能が低下する傾向にあるからであ
る。また、冷却風４の温度は20℃が好ましく、そ
の送風速度は50〜100ｍ／分の範囲が好ましい。
本発明はポリアミド、ポリエステル、アクリル
などの熱可塑性合成重合体を溶融紡糸して得られ
る繊維に適用することができる。
［発明の効果］
以上説明したように、本発明によれば、巾の狭
いスリツトから吐出されるポリマは、巾の広いス
リツトから吐出されるポリマに比較して、より速
く、より強く冷却されることになり、そのため
に、断面異方性の差をより大きくすることができ
る。しかも、一方向からのみ流れる冷却風で冷却
するので、その効果がより一層助長される。した
がつて、潜在捲縮能が大変に優れた繊維を安定し
て得ることができる。
以下、実施例により、本発明の効果を具体的に
説明する。なお、実施例に記載した潜在捲縮能を
表わす１／ｄは、次の方法によつて求めた。
＜潜在捲縮能＞
紡糸した中空未延伸糸の単繊維を3.5mmに切断
し、これを98℃の温水に浸漬する。この時、単繊
維は捲縮発現してコイル状となる。このコイルの
直径ｄを目盛付き実体顕微鏡で観察して測定し、
１／ｄを求めた。１／ｄは大きい方（具体的には
3.0以上）が潜在捲縮能に優れていることを意味
する。
［実施例１］
極限粘度0.625のポリエチレンテレフタレート
を溶融温度290℃で、第１図に示すスリツト形状
の紡糸口金で、WaとWbを表１に示すように、
種々変更したものを用いて、紡糸口金面下５〜45
cmの範囲で、矢印の方向から冷却風を80ｍ／分の
割合で吹き付け、冷却・固化して引取つた。この
未延伸糸の単繊維の潜在捲縮能１／ｄを、上述の
方法によつて求めたところ、表１に示すような結
果が得られた。
[Technical Field] The present invention relates to a method for melt spinning eccentric hollow fibers. More specifically, the present invention relates to an improvement in a method for melt-spinning eccentric hollow fibers having latent crimp ability. [Prior art and its problems] In general, in order to obtain fibers with latent crimp ability, there are known composite spinning methods such as the so-called bimetal type or eccentric core-sheath type, and an asymmetric cooling method in which the spun yarn is rapidly cooled. However, the present invention relates to the latter, and moreover, to hollow fibers. Conventionally, as a spinneret for obtaining latent crimpable hollow fibers by an asymmetric cooling method, a plurality of slits 2 are bored in a spinneret body 1, as illustrated in a plan view in FIG. things have been used. When using such a spinneret to obtain an eccentric hollow fiber having latent crimp ability, in the case of FIG. 6, since the width W of the slits is the same,
Even if an attempt was made to create cross-sectional anisotropy using cooling air, it was not possible to expect much cross-sectional anisotropy due to the difference in cooling. In addition, in order to obtain large cross-sectional anisotropy,
If the cooling air is strengthened, thread breakage occurs frequently during spinning.
The spinnability was poor. Therefore, for example, as in the invention described in Japanese Patent Publication No. 56-29007, it has been considered to make a hollow fiber into an eccentric hollow fiber with a thinner part in its cross section, and to apply cooling air to the thinner part. That is, as shown in FIG. 7, slits 2c and 2d of the same width are bored in the spinneret body 1, and
Using a spinneret with a notch S between c and 2d, the notch S as shown in Fig. 8 is used.
An eccentric hollow fiber 3 is obtained in which the portion T where the amount of polymer discharged is small is made thinner, and cooling air is applied to the thinner portion T. However, although eccentric hollow fibers can be obtained with this method, the range R of the thin wall portion T of the obtained eccentric hollow fibers is narrow, so that the potential crimp capacity 1/d measured by the measurement method described later is , it had the disadvantage that it could not be made higher than 3.0. [Object of the Invention] The object of the present invention is to overcome the problems of the above-mentioned conventional techniques and to provide a melt spinning method that can stably obtain eccentric hollow fibers with good spinnability and excellent latent crimp performance. It is about providing. [Structure of the Invention] In order to achieve the above object, the present invention provides methods for melt spinning hollow fibers while cooling them with cooling air flowing from only one direction. Each hole is formed by drilling discontinuous slits such that the relationship between the width Wa of the slit on the cooling side and the width Wb of the slit on the opposite side is 1.2≦Wb/Wa≦2.0. It is characterized by spinning with a spinneret consisting of: Hereinafter, the present invention will be specifically explained based on the drawings. 1 to 4 are plan views showing examples of the shapes of slits, which are discharge holes of a spinneret used in the present invention. FIG. 5 is a cross-sectional view of the eccentric hollow fiber obtained by the present invention. In FIGS. 1 to 4, 1 is a spinneret body;
2a is a slit on the cooling side, that is, on the windward side of the cooling air, and 2b is a slit on the opposite side, that is, on the leeward side. 4 is cooling air that flows only from one direction. In the present invention, the width of the slit 2a on the cooling side
The relationship between Wa and the width Wb of the slit 2b on the opposite side must be 1.2≦Wb/Wa≦2.0. That is, the width of the slit 2a on the cooling side is narrowed, and the width of the slit 2b on the opposite side is widened. If the slit width ratio Wb/Wa is less than 1.2, the cross-sectional anisotropy of the hollow fiber obtained by spinning will be small, and the potential crimpability will be the same as that of conventional products. Also, if Wb/Wa exceeds 2.0,
This is because although the latent crimp ability increases and becomes good, the thin wall portions may tear during or after spinning, resulting in punctures or poor hollow molding. Slit width
It is preferable that Wa is 0.08 to 0.14 mm and Wb is 0.10 to 0.24 mm. Further, the slits 2a and 2b must be arranged so as to be substantially aligned on one of the circumferences.
Here, "substantially" means that each slit 2a, 2b
Even if the slits are connected in the circumferential direction, if there are slits protruding from the same circumference, for example, as shown in Figure 4, the inner radius of the slit with the longer radius is the outer radius r 1 of the slit with the shorter radius. Ratio of r 2
This means that r 2 /r 1 is 1.05 or less. When melt spinning is performed using such a spinneret, eccentric hollow fibers 3 as shown in FIG. 5 can be stably obtained. What is important here is the thin part T
The range R is larger than R shown in FIG. 8, and therefore the potential crimp capacity 1/d is large, as will be described later. In order to obtain an eccentric hollow fiber in which the eccentricity is further promoted, that is, the above-mentioned R is even larger, the cutout portion S of the slit as shown in Japanese Patent Publication No. 56-29007 can be cut out as shown in Fig. 3. It is preferable to provide the slit 2a of the present invention. The length of the slit 2a on the cooling side is 35 to 60% of the entire circumference, and the length of the slit 2b on the opposite side is
Although 60 to 35% is preferable, it is more preferable that both are 45 to 55% each. This is because when the length ratio is outside this range, the potential crimp ability tends to decrease. Further, the temperature of the cooling air 4 is preferably 20°C, and the blowing speed is preferably in the range of 50 to 100 m/min. The present invention can be applied to fibers obtained by melt-spinning thermoplastic synthetic polymers such as polyamide, polyester, and acrylic. [Effects of the Invention] As explained above, according to the present invention, polymer discharged from a narrow slit is cooled faster and more strongly than polymer discharged from a wide slit. Therefore, the difference in cross-sectional anisotropy can be made larger. Moreover, since the cooling air flows from only one direction, the effect is further enhanced. Therefore, fibers with very good latent crimp ability can be stably obtained. EXAMPLES Hereinafter, the effects of the present invention will be specifically explained with reference to Examples. Note that 1/d, which represents the potential crimp ability described in the Examples, was determined by the following method. <Potential crimping ability> A single fiber of the spun hollow undrawn yarn is cut into 3.5 mm pieces and immersed in warm water at 98°C. At this time, the single fiber develops crimp and becomes coiled. Observe and measure the diameter d of this coil with a graduated stereomicroscope,
1/d was calculated. 1/d is the larger one (specifically
3.0 or higher) means that the potential crimp capacity is excellent. [Example 1] Polyethylene terephthalate with an intrinsic viscosity of 0.625 was melted at a melting temperature of 290°C, using a slit-shaped spinneret shown in Fig. 1, and Wa and Wb as shown in Table 1.
Using various modifications, spinneret surface 5 to 45
Cooling air was blown at a rate of 80 m/min from the direction of the arrow within a range of 1.5 cm, and the material was cooled and solidified before being collected. When the potential crimp capacity 1/d of the single fibers of this undrawn yarn was determined by the method described above, the results shown in Table 1 were obtained.
【表】
No.２および３は実施例であり、No.１および４は
本発明の効果を明確にするための比較例である。
No.２および３は１／ｄが大きく、潜在捲縮能が
優れていることを示している。これに対して、比
較例のNo.１は１／ｄが小さく、潜在捲縮性能の点
で不満足であつた。また、No.４は１／ｄが大きい
ものの、スリツト巾の比が大きすぎるため、中空
部にパンクが見られ中空成型性が不良となつた。
［実施例２］
第２図、第３図に示すスリツト形状の紡糸口金
で、WaとWbを表２に示したものを用いた以外
は、実施例１と同様の条件で未延伸糸を得た。こ
の未延伸糸の単繊維の１／ｄを上述の方法によつ
て求めたところ、表２に示すような結果が得られ
た。[Table] Nos. 2 and 3 are examples, and Nos. 1 and 4 are comparative examples for clarifying the effects of the present invention. Nos. 2 and 3 have large 1/d, indicating excellent potential crimp ability. On the other hand, Comparative Example No. 1 had a small 1/d and was unsatisfactory in terms of latent crimp performance. In addition, although No. 4 had a large 1/d, the slit width ratio was too large, so punctures were observed in the hollow part and the hollow moldability was poor. [Example 2] An undrawn yarn was obtained under the same conditions as in Example 1, except that Wa and Wb shown in Table 2 were used with the slit-shaped spinneret shown in FIGS. 2 and 3. Ta. When the 1/d of the single fibers of this undrawn yarn was determined by the method described above, the results shown in Table 2 were obtained.
【表】
No.６は紡糸口金のスリツト２ａに切り欠き部分
Ｓを設けた、より好ましい実施例であり、No.７は
本発明の効果を明確にするための比較例である
（比較例においては、第７図に示した紡糸口金を
用いた）。
No.５は実施例１と同様、潜在捲縮能が優れてい
た。またNo.６は、No.５よりも相対的に１／ｄが大
きく、潜在捲縮能がより一層優れていることを示
している。これに対して、比較例のNo.７は１／ｄ
が小さく、潜在捲縮能の点で不満足であり、紡糸
性も不安定であつた。[Table] No. 6 is a more preferred embodiment in which a notch S is provided in the slit 2a of the spinneret, and No. 7 is a comparative example to clarify the effects of the present invention (in the comparative example The spinneret shown in FIG. 7 was used). Like Example 1, No. 5 had excellent potential crimp ability. Further, No. 6 has a relatively larger 1/d than No. 5, indicating that the potential crimp ability is even more excellent. On the other hand, Comparative Example No. 7 is 1/d
was small, the crimp potential was unsatisfactory, and the spinnability was unstable.
第１図〜第４図は本発明に用いる紡糸口金の吐
出孔であるスリツトの形状の例を示す平面図であ
る。第５図は本発明で得られた偏心中空繊維の一
例を示す横断面図である。第６図、第７図は従来
の紡糸口金のスリツトの例を示す平面図である。
第８図は第７図の紡糸口金で得られた偏心中空繊
維の一例を示す横断面図である。
１：紡糸口金本体、２：スリツト、３：偏心中
空繊維、４：冷却風。
1 to 4 are plan views showing examples of the shapes of slits, which are discharge holes of the spinneret used in the present invention. FIG. 5 is a cross-sectional view showing an example of an eccentric hollow fiber obtained by the present invention. FIGS. 6 and 7 are plan views showing examples of conventional spinneret slits.
FIG. 8 is a cross-sectional view showing an example of an eccentric hollow fiber obtained using the spinneret of FIG. 7. 1: spinneret body, 2: slit, 3: eccentric hollow fiber, 4: cooling air.
Claims (1)
中空繊維を溶融紡糸するに際して、紡糸口金面
に、実質的に同一円周上に位置するように不連続
なスリツトを穿設することにより各孔を形成し、
前記スリツトのうち、冷却側のスリツトの巾Wa
と、反対側のスリツトの巾Wbとの関係が、1.2≦
Wb／Wa≦2.0からなる紡糸口金で紡糸すること
を特徴とする偏心中空繊維の溶融紡糸方法。 ２ 冷却側のスリツトに１個以上の切り欠き部分
を設けてなる特許請求の範囲第１項記載の偏心中
空繊維の溶融紡糸方法。[Claims] 1. When melt-spinning hollow fibers while cooling with cooling air flowing from only one direction, discontinuous slits are bored on the spinneret surface so as to be located substantially on the same circumference. Form each hole by
Among the slits, the width of the slit on the cooling side Wa
The relationship between this and the width Wb of the slit on the opposite side is 1.2≦
A method for melt spinning eccentric hollow fibers, characterized by spinning with a spinneret having Wb/Wa≦2.0. 2. The method for melt spinning eccentric hollow fibers according to claim 1, wherein one or more notches are provided in the slit on the cooling side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22389784A JPS61108707A (en) | 1984-10-26 | 1984-10-26 | Melt-extrusion of eccentrically hollowed fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22389784A JPS61108707A (en) | 1984-10-26 | 1984-10-26 | Melt-extrusion of eccentrically hollowed fiber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61108707A JPS61108707A (en) | 1986-05-27 |
| JPS6330405B2 true JPS6330405B2 (en) | 1988-06-17 |
Family
ID=16805417
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22389784A Granted JPS61108707A (en) | 1984-10-26 | 1984-10-26 | Melt-extrusion of eccentrically hollowed fiber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61108707A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5439626A (en) * | 1994-03-14 | 1995-08-08 | E. I. Du Pont De Nemours And Company | Process for making hollow nylon filaments |
| DE102013016628A1 (en) * | 2013-10-08 | 2015-04-09 | Trützschler GmbH & Co Kommanditgesellschaft | Spinneret for extruding self-crimping hollow fibers and self-crimping hollow fibers and method for producing self-crimping hollow fibers |
| CN103835012A (en) * | 2014-02-21 | 2014-06-04 | 苏州龙杰特种纤维股份有限公司 | Spinneret plate and method for producing multi-dimensional hollow elastic polyester yarn |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5053622A (en) * | 1973-09-17 | 1975-05-12 | ||
| JPS5721510A (en) * | 1980-07-08 | 1982-02-04 | Toray Ind Inc | Spinneret for hollow fiber |
-
1984
- 1984-10-26 JP JP22389784A patent/JPS61108707A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5053622A (en) * | 1973-09-17 | 1975-05-12 | ||
| JPS5721510A (en) * | 1980-07-08 | 1982-02-04 | Toray Ind Inc | Spinneret for hollow fiber |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61108707A (en) | 1986-05-27 |
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