JPH03185106A - Spinneret for multifilament and melt-spinning process - Google Patents
Spinneret for multifilament and melt-spinning processInfo
- Publication number
- JPH03185106A JPH03185106A JP32216689A JP32216689A JPH03185106A JP H03185106 A JPH03185106 A JP H03185106A JP 32216689 A JP32216689 A JP 32216689A JP 32216689 A JP32216689 A JP 32216689A JP H03185106 A JPH03185106 A JP H03185106A
- Authority
- JP
- Japan
- Prior art keywords
- spinneret
- holes
- hole
- discharge
- filaments
- 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
- 238000002074 melt spinning Methods 0.000 title claims abstract description 13
- 229920001169 thermoplastic Polymers 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 17
- 238000001816 cooling Methods 0.000 abstract description 29
- 238000009987 spinning Methods 0.000 abstract description 22
- 238000001125 extrusion Methods 0.000 abstract 5
- 230000001747 exhibiting effect Effects 0.000 abstract 1
- 238000002474 experimental method Methods 0.000 description 5
- 229920000642 polymer Polymers 0.000 description 5
- 239000011148 porous material Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- 230000004927 fusion Effects 0.000 description 3
- 238000007711 solidification Methods 0.000 description 3
- 230000008023 solidification Effects 0.000 description 3
- 229920002994 synthetic fiber Polymers 0.000 description 3
- 239000012209 synthetic fiber Substances 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- -1 polyethylene terephthalate Polymers 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- ISPYQTSUDJAMAB-UHFFFAOYSA-N 2-chlorophenol Chemical compound OC1=CC=CC=C1Cl ISPYQTSUDJAMAB-UHFFFAOYSA-N 0.000 description 1
- 229920001410 Microfiber Polymers 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 238000003491 array Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 239000012768 molten material Substances 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920006149 polyester-amide block copolymer Polymers 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Landscapes
- Artificial Filaments (AREA)
- Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は多フィラメントを溶融紡糸するための紡糸口金
、およびかかる紡糸口金を用いて、融着や糸切れのない
安定した紡糸性で、多フィラメントを溶融紡糸する方法
に関する。Detailed Description of the Invention [Industrial Application Field] The present invention provides a spinneret for melt-spinning multifilaments, and using such a spinneret, a multifilament spinneret with stable spinnability without fusion or yarn breakage, and a spinneret for melt spinning multifilaments. The present invention relates to a method for melt spinning filaments.
［従来の技術］
合成繊維の生産性を高めるために、近年、増々多フィラ
メント化、高速化が進んで来ている。[Prior Art] In recent years, in order to increase the productivity of synthetic fibers, the number of filaments and the speed have increased more and more.
多フィラメント化の大きな流れの１つは極細繊維の製造
技術である。近年、極細糸のフィラメントデニールは増
々細デニール化され、０．１デニ一ル近辺にまで達して
いる。このような極細糸の生産性を高めるためには多フ
ィラメント化が必須となる。One of the major trends in multifilament is the production technology of ultrafine fibers. In recent years, the filament denier of ultrafine yarn has become increasingly finer, reaching around 0.1 denier. In order to increase the productivity of such ultrafine yarns, it is essential to make them multifilamentous.
また、もう１つの大きな流れは、１紡糸口金多本取りの
製造技術である。すなわち、１つの紡糸口金から多フィ
ラメントを紡出し、それを複数本の糸条に分割して巻取
る技術が必要とされる。１紡糸口金多本取りによって、
合成繊維の製造コストは格段に低減するが、この場合も
多フィラメント化が必須となる。Another major trend is the production technology of multiple spinnerets. That is, a technique is required to spin multifilaments from one spinneret, divide them into a plurality of threads, and wind them. With multiple spinnerets,
The manufacturing cost of synthetic fibers is significantly reduced, but in this case as well, multi-filament production is essential.
このような多フィラメント化に伴って、次のような問題
が発生してきている。すなわち、紡糸口金から紡出され
るフィラメント数が多いと、冷却固化される過程で、フ
ィラメント同志が接触して紡糸性が低下したり、紡糸口
金の中央部付近から紡出されたフィラメントが冷却不足
となって、フィラメント間に冷却斑が発生し、得られる
多フィラメントの均一性が低下するという問題である。With the increase in the number of filaments, the following problems have arisen. In other words, if a large number of filaments are spun from the spinneret, the filaments may come into contact with each other during the cooling and solidification process, resulting in poor spinnability, or the filaments spun from near the center of the spinneret may be insufficiently cooled. This causes a problem in that cooling spots occur between the filaments and the uniformity of the resulting multifilaments decreases.
この問題は紡糸口金に穿孔した吐出孔の間隔を十分に広
げることで解消できるものの、口金面積の大きな紡糸口
金が必要となり、設備上不利となる。従って、多フィラ
メント化における技術課題は、いかにして密集した多フ
ィラメントを安定して得るかにある。Although this problem can be solved by sufficiently widening the interval between the discharge holes formed in the spinneret, this requires a spinneret with a large spinneret area, which is disadvantageous in terms of equipment. Therefore, the technical problem in producing multifilaments is how to stably obtain densely packed multifilaments.
このような問題を改善せんとして、特開昭５３−６１７
１１号公報や特開昭５６−１０７００５号公報には、多
フィラメントに対して一方から横吹き冷却する方法を用
いて溶融紡糸するに際して、冷却風の吹き付は方向と平
行に分離帯を設けることが提案されている。該方法によ
れば、紡糸口金内周部に冷却風を取り込むことができる
ため、比較的フィラメント数の少ない場合にはフィラメ
ント間の冷却斑は起りにくい。しかし、フィラメント数
がさらに多い場合や紡糸速度が速くなった場合、分割さ
れたフィラメント群の中央部付近や冷却風の風下側のフ
ィラメントの冷却不足が起り易いという欠点を有してい
る。In order to improve this problem, Japanese Patent Application Laid-Open No. 53-617
No. 11 and JP-A-56-107005 disclose that when melt-spinning multifilaments using a method of cross-blowing cooling from one side, a separation zone is provided parallel to the direction in which the cooling air is blown. is proposed. According to this method, since cooling air can be taken into the inner circumference of the spinneret, uneven cooling between the filaments is less likely to occur when the number of filaments is relatively small. However, when the number of filaments is increased or the spinning speed is increased, there is a drawback that insufficient cooling of the filaments near the center of the divided filament group or on the leeward side of the cooling air tends to occur.
また、横吹き冷却法による上記欠点を解消する方法とし
て、特開昭５５−９０６０９号公報や特開昭５５−９３
８１６号公報には、紡糸口金の吐出孔を同心円上に環状
配列、または環状ブロック配列とし、紡出した多フィラ
メントをとり囲むように円筒型冷却装置を用いて冷却す
る方法が提案されている。該方法によれば、円筒型冷却
装置で、多フィラメントをとり囲むため、横吹き冷却法
のように、風下側のフィラメントが冷却不足を起すとい
うことはなくなる。しかしながら、吐出孔が環状に、狭
い配列間隔で複数列穿孔されているため、高紡糸速度下
では、配列外周フィラメントの随伴気流がいわゆるエア
ーカーテンを形成し、配列内周部のフィラメントが冷却
不足を起し易いという欠点を有している。In addition, as a method to eliminate the above-mentioned drawbacks of the cross-blowing cooling method, Japanese Patent Application Laid-Open No. 55-90609 and Japanese Patent Application Laid-Open No. 55-93
Japanese Patent No. 816 proposes a method in which the discharge holes of a spinneret are arranged concentrically in an annular arrangement or in an annular block arrangement, and a cylindrical cooling device is used to surround the spun multifilaments for cooling. According to this method, since the multifilament is surrounded by a cylindrical cooling device, there is no possibility that the filament on the leeward side is insufficiently cooled as in the side blow cooling method. However, since multiple rows of discharge holes are formed in an annular manner at narrow intervals, at high spinning speeds, the accompanying airflow of the filaments on the outer periphery of the array forms a so-called air curtain, causing the filaments on the inner periphery of the array to be insufficiently cooled. It has the disadvantage of being easy to cause.
この欠点を改善する試みとして、特開昭５７−１６１１
１３号公報には、吐出孔（導入孔）を同心円上に１列な
いし２列配置し、紡出糸条をとり囲む外部冷却装置と、
紡出糸条によって、とり囲まれた内部冷却装置とを併用
して紡出糸条を冷却する方法が提案されている。しかし
ながら、該方法は内部冷却装置を用いるため、設備コス
トが高く、また紡糸操作性も悪く、かつ配列数が少なく
なるために、吐出孔（導入孔）数に限界があるという欠
点がある。即ち、本発明の目的の１つである多フィラメ
ント化を達成することは困難である。In an attempt to improve this drawback, Japanese Patent Application Laid-Open No. 57-1611
No. 13 discloses an external cooling device in which one or two rows of discharge holes (introduction holes) are arranged concentrically and surrounds the spun yarn;
A method has been proposed for cooling the spun yarn in conjunction with an internal cooling device surrounded by the spun yarn. However, since this method uses an internal cooling device, the equipment cost is high, the spinning operability is poor, and the number of arrays is small, so the number of discharge holes (introduction holes) is limited. That is, it is difficult to achieve multifilamentization, which is one of the objectives of the present invention.
一方、多量のマルチフィラメントを経済的に紡糸するこ
とを目的として特公昭３４−１０２５７号公報には、塩
化ビニル系合成繊維を溶融紡糸する紡糸口金においで、
溶融物を等分するためのダイとダイの底面に円周上に吐
出孔を設けた口金が提案されている。該口金によれば、
１つの導入孔に複数の吐出孔を設けているため、多本取
りが可能となる。しかしなしから、該口金は、１つの導
入孔に対し、円周上に吐出孔を設けているため、多フィ
ラメント化を図ると、紡糸口金内周部のフィラメントが
冷却不足となり易い欠点を有している。On the other hand, for the purpose of economically spinning a large amount of multifilament, Japanese Patent Publication No. 34-10257 discloses that in a spinneret for melt-spinning vinyl chloride synthetic fibers,
A die for equally dividing the molten material and a die having discharge holes circumferentially provided on the bottom of the die have been proposed. According to the cap,
Since a plurality of discharge holes are provided in one introduction hole, it is possible to take out multiple tubes. However, since this spinneret has a discharge hole on the circumference for one introduction hole, it has the disadvantage that the filaments at the inner circumference of the spinneret tend to be insufficiently cooled when trying to make multiple filaments. ing.
また、１つの導入孔に複数の吐出孔を配置した溶融紡糸
方法として、特開昭６Ｄ−１１３２８０３号公報には、
］個の導入孔の底部に孫オリフィスと１孔当りの吐出量
が孫オリフィスより大きくなるような孔断面積の親オリ
フィスが各々１孔以上穿孔された紡糸口金を用い、孫オ
リフィスからの紡出糸条と親オリフィスからの紡出糸条
を別々に巻き取る方法が提案されている。Furthermore, as a melt spinning method in which a plurality of discharge holes are arranged in one introduction hole, Japanese Patent Application Laid-Open No. 6D-1132803 describes
] Spinning from the grandchild orifice using a spinneret in which at least one grandchild orifice and one parent orifice with a hole cross-sectional area such that the discharge amount per hole is larger than that of the grandchild orifice are bored at the bottom of each introduction hole. A method has been proposed in which the yarn and the spun yarn from the parent orifice are separately wound.
該方法によれば孫オリフィスからの極細糸条と、親オリ
フィスからの太デニール糸条とが一気に得られる。しか
しながら、前記導入孔を密集化し、多フィラメント化を
図った場合、極細糸条と太デニール糸条との分離が困難
になるという欠点を有している。また、極細糸条の周囲
に発生する随伴気流速度と太デニール糸条の周囲に発生
する随伴気流速度とが著しく異なるために、気流の乱れ
が生じ、紡糸安定性が極端に低下するという欠点も有し
ている。According to this method, ultrafine yarn from the grandchild orifice and thick denier yarn from the parent orifice can be obtained at once. However, when the introduction holes are densely packed to create a multifilament structure, there is a drawback that it becomes difficult to separate the ultrafine yarn from the thick denier yarn. Another disadvantage is that the speed of the accompanying airflow generated around the ultra-fine yarn and the speed of the accompanying airflow generated around the thick denier yarn are significantly different, resulting in airflow turbulence and extremely reduced spinning stability. have.
［発明が解決しようとする課題］
本発明は、前記した多フィラメント化の問題点を解消す
ること、すなわち、フィラメント同志の接触による融着
や、冷却不足によって生ずる糸切れ、糸斑を防止し、安
定した紡糸性と均一な糸条を得るための多フィラメント
紡糸口金、およびその紡糸口金を用いた溶融紡糸方法を
提供しようとするものである。[Problems to be Solved by the Invention] The present invention solves the above-mentioned problems of multifilament, that is, prevents filaments from fusing together due to contact with each other, and yarn breakage and unevenness caused by insufficient cooling, and stabilizes the yarn. The present invention aims to provide a multifilament spinneret for obtaining uniform yarns with improved spinnability, and a melt spinning method using the spinneret.
本発明者らは、多フィラメントを安定して紡糸するため
の方法について鋭意検討した結果、円形導入孔を環状に
配列せしめ、各円形導入孔に複数の吐出孔を限定した範
囲で、かつ、実質的に１列に配置せしめた特殊な紡糸口
金を用いることによって、安定した紡糸が可能であるこ
とをつきとめ、本発明に到達したものである。As a result of intensive research into a method for stably spinning multifilaments, the present inventors have determined that circular introduction holes are arranged in an annular manner, and that within the range of limiting a plurality of discharge holes to each circular introduction hole, The present invention was achieved by finding that stable spinning was possible by using a special spinneret arranged in a single row.
［課題を解決するための手段］
すなわち本発明は、
（１〉 円形導入孔の底部に孔径の等しい複数の吐出
孔を実質的に一列に設け、該吐出孔間の最小孔間隔を吐
出孔径の２倍以上で、かつ吐出孔間の平均孔間隔を２ｍ
ｍ以下とし、前記円形導入孔を環状に配置せしめるとと
もに、前記吐出孔群も環状に配置させることを特徴とす
る多フィラメント紡糸口金。[Means for Solving the Problems] That is, the present invention has the following features: (1) A plurality of discharge holes having the same diameter are provided substantially in a row at the bottom of the circular introduction hole, and the minimum hole interval between the discharge holes is set to the diameter of the discharge hole. 2 times or more, and the average hole spacing between the discharge holes is 2 m
m or less, and the circular introduction holes are arranged in a ring shape, and the discharge hole group is also arranged in a ring shape.
（２〉 熱可塑性重合体を溶融紡糸する際に、請求項
（１）記載の多フィラメント紡糸口金を用いることを特
徴とする溶融紡糸方法。(2) A melt-spinning method characterized by using the multifilament spinneret according to claim (1) when melt-spinning a thermoplastic polymer.
の構成からなる。It consists of the following.
以下本発明を詳述する。The present invention will be explained in detail below.
本発明で最も重要なことは、紡糸口金の円形導入孔の底
部に孔径の等しい複数の吐出孔を実質的に１列に設ける
とともに、円形導入孔を環状に配列すること。また、吐
出孔間の最小孔間隔および平均孔間隔を限定した範囲に
することである。The most important thing in the present invention is to provide a plurality of discharge holes having the same diameter substantially in a row at the bottom of the circular introduction hole of the spinneret, and to arrange the circular introduction holes in an annular shape. Further, the minimum hole spacing and the average hole spacing between the discharge holes are set within a limited range.
以下、本発明の紡糸口金を図を用いて詳述する。第１図
は本発明の紡糸口金の背面の例を示す平面図、第２図は
第１図に示す円形導入孔の部分拡大図、第３図は第２図
のＸ−Ｘ−断面図、第４図は本発明の紡糸口金の背面の
他の例を示す平面図である。Hereinafter, the spinneret of the present invention will be explained in detail using figures. FIG. 1 is a plan view showing an example of the back side of the spinneret of the present invention, FIG. 2 is a partially enlarged view of the circular introduction hole shown in FIG. 1, and FIG. 3 is a sectional view taken along line X-X in FIG. 2. FIG. 4 is a plan view showing another example of the back surface of the spinneret of the present invention.
本発明の紡糸口金は、第１図〜第３図に示す紡糸口金本
体１の背面に穿孔された円形導入孔２の底部４に複数の
吐出孔３を設けた構成とする。底部４は紡糸口金背面に
平行な面の部分をさす。The spinneret of the present invention has a configuration in which a plurality of discharge holes 3 are provided at the bottom 4 of a circular introduction hole 2 bored in the back surface of the spinneret main body 1 shown in FIGS. 1 to 3. The bottom part 4 refers to the part of the plane parallel to the back side of the spinneret.
１つの円形導入孔に１つの吐出孔を穿孔した通常の紡糸
口金の場合、導入孔の間隔を狭くし、高密集化しても、
２ ｍｍ強の吐出孔間隔が限度である。つまり、吐出孔
間隔を狭くしようとすると、円形導入孔の孔径を極めて
小さくする必要があり、耐圧を必要とする５ｍｍ以上の
厚さを有人孔に複数の吐出孔を設けることによってはじ
めて解消でき、吐出孔の高密集化が達成できる。In the case of a normal spinneret with one circular introduction hole and one discharge hole, even if the introduction holes are narrowed and densely packed,
The limit is a discharge hole interval of a little more than 2 mm. In other words, in order to narrow the gap between the discharge holes, it is necessary to make the diameter of the circular introduction hole extremely small, and the thickness of 5 mm or more, which requires pressure resistance, can only be solved by providing multiple discharge holes in the manned hole. High density of discharge holes can be achieved.
なお、本発明において導入孔を円形にして円形導入孔２
としたのは、紡糸口金製作上、工作し易くするためであ
る。In addition, in the present invention, the introduction hole is made circular, and the circular introduction hole 2
This is to make the spinneret easier to work with.
また、本発明の吐出孔３は孔径が等しい必要がある。異
なる孔径の吐出孔が設けられていると、孔径の大きな吐
出孔からの重合体流の吐出線速度は、孔径の小さい吐出
孔からの重合体流のそれに比べ、大きくなり、隣接する
重合体流に速度差があるため、小さな外乱でもｆｉ！！
着し易くなる。また、両者のフィラメントの周囲に形成
される随伴気流速度にも差が生じ、気流の乱れによって
融着し易くなり、甚しい場合は糸切れの原因となる。Further, the discharge holes 3 of the present invention need to have the same hole diameter. When discharge holes with different pore sizes are provided, the discharge linear velocity of the polymer flow from the discharge hole with a large pore diameter is higher than that of the polymer flow from a discharge hole with a small pore diameter, and the adjacent polymer flow Since there is a speed difference between the two, even a small disturbance can cause fi! !
It becomes easier to wear. Furthermore, there is a difference in the velocity of the accompanying airflow formed around the two filaments, and the turbulence of the airflow tends to cause fusing, which, in severe cases, can cause yarn breakage.
従って、安定した紡糸性を得るためには吐出孔３の孔径
は工作精度の許す範囲内で等しい必要がある。Therefore, in order to obtain stable spinning properties, the diameters of the discharge holes 3 must be equal within the range allowed by the machining accuracy.
なお、本発明の吐出孔の横断面形状は必ずしも円形に限
られるものではなく、変形した吐出孔にも適用可能であ
る。その場合には孔径が等しいということは実質的に同
一の形状を意味する。ただしスリット状の横断面形状よ
りなる吐出孔の工作精度を上げることは、一般に困難で
あるので、本発明の多フィラメント密集化の効果が最も
発揮できるのは円形の吐出孔の場合である。Note that the cross-sectional shape of the discharge hole of the present invention is not necessarily limited to a circular shape, and the present invention is also applicable to deformed discharge holes. In that case, equal pore diameters mean substantially identical shapes. However, since it is generally difficult to improve the machining accuracy of a discharge hole having a slit-like cross-sectional shape, the effect of multifilament densification according to the present invention is most effective in the case of a circular discharge hole.
また、本発明では吐出孔３は実質的に１列に設ける必要
がある。実質的に１列とは、第２図へに示すような、完
全に１列の状態に限定されるものでなく、第２図Ｂに示
すごとく、１つの円形導入孔に穿孔された互いに最も離
れた２孔を結ぶ直線の長ざΩ２を（１円形導入孔間りの
吐出孔数−１〉で除した幅Ω３の範囲内で前記直線より
交互にずれて穿孔されていてもよい。Further, in the present invention, the discharge holes 3 need to be provided substantially in one row. Substantially one row is not limited to a complete row as shown in FIG. 2, but as shown in FIG. The holes may be drilled alternately offset from the straight line within a width Ω3 obtained by dividing the length Ω2 of a straight line connecting two separate holes by (the number of discharge holes between one circular introduction hole - 1).
吐出孔３が１つの円形導入孔内で複数列の状態、すなわ
ち、紡糸口金中心からの同−放銅線上（例えば第１図Ｙ
−Ｙ’線上）に複数存在すると、紡糸口金中心に近いフ
ィラメントの冷却不足が発生する。これは、紡糸口金外
周部から紡出されるフィラメントの随伴気流によって、
エアーカーテンが形成され、紡糸口金内周部に位置する
フィラメントが十分冷却されなくなるためである。A state in which the discharge holes 3 are arranged in multiple rows within one circular introduction hole, that is, on the same copper wire from the center of the spinneret (for example, in FIG.
-Y' line), insufficient cooling of the filaments near the center of the spinneret occurs. This is caused by the accompanying airflow of the filaments spun from the outer periphery of the spinneret.
This is because an air curtain is formed and the filaments located at the inner periphery of the spinneret are not sufficiently cooled.
従って、紡糸性を向上せしめるためには、吐出孔３は実
質的に１列に配置する必要がある。Therefore, in order to improve spinnability, the discharge holes 3 must be arranged substantially in one row.
また、本発明では、吐出孔間の最小孔間隔は吐出孔径の
２倍以上である必要がある。本発明者らは、どこまで吐
出孔の孔間隔を狭くし得るかについて詳細に検討した結
果、フィラメント同志が融着を起さない最小孔間隔は吐
出孔の孔径に依存しており、吐出孔の孔径の２倍以上あ
れば融着しにくいことを見いだした。最小孔間隔が吐出
孔径の２倍未満では、フイラメン［・同志が融着して、
２本または数本が束となって膜状に紡出されでしまう。Further, in the present invention, the minimum hole interval between the discharge holes needs to be at least twice the discharge hole diameter. As a result of detailed study on how narrow the gap between the discharge holes can be, the inventors found that the minimum gap between the holes that does not cause filaments to fuse together depends on the diameter of the discharge holes. It has been found that if the diameter is more than twice the pore diameter, it is difficult to fuse. If the minimum hole interval is less than twice the discharge hole diameter, the filament [・ comrades will fuse together,
Two or several fibers are bundled together and spun into a film.
フィラメント同志を接触させないで紡糸安定性を高める
ためには、吐出孔間の最小孔間隔は吐出孔径の４倍以上
あることがより好ましい。In order to improve spinning stability without causing filaments to come into contact with each other, it is more preferable that the minimum hole interval between the discharge holes is four times or more the diameter of the discharge holes.
また本発明では、円形導入孔２を環状に配置せしめると
ともに、吐出孔３の群を環状に配置することが必要であ
る。円形導入孔２が複数の列（同一放射線上に円形導入
孔２を複数配置）に配置されたり、吐出孔３が複数の列
に配置されていると、前述したように配列内周部に存在
するフィラメントが冷却不足となって紡糸性が悪化する
。特に紡糸速度が速い場合や、フィラメント数が極めて
多い場合は前記随伴気流が顕著に増大するため、配列内
周部の冷却不足に起因する糸切れが多発するようになる
。Further, in the present invention, it is necessary to arrange the circular introduction holes 2 in an annular manner and to arrange the group of discharge holes 3 in an annular manner. If the circular introduction holes 2 are arranged in multiple rows (a plurality of circular introduction holes 2 are arranged on the same radiation line) or the discharge holes 3 are arranged in multiple rows, as described above, there is a problem in the inner circumference of the arrangement. The filaments are insufficiently cooled, resulting in poor spinnability. In particular, when the spinning speed is high or when the number of filaments is extremely large, the entrained airflow increases significantly, resulting in frequent yarn breakage due to insufficient cooling of the inner periphery of the array.
なお、本発明でいう環状に配置するとは、第１図のよう
に円形導入孔２が完全に円周上に配置された場合の他に
、千鳥配置や、多角形状の配置等も含む。しかし、紡糸
口金の中心からの同−族９Ａ線上に複数の吐出孔が存在
しない配置とし、吐出孔群の紡糸口金中心からの距離が
等しくなるように円周上にほぼ１列に配置することが好
ましい。Note that the annular arrangement in the present invention includes not only the case where the circular introduction holes 2 are arranged completely on the circumference as shown in FIG. 1, but also a staggered arrangement, a polygonal arrangement, and the like. However, the arrangement is such that a plurality of discharge holes do not exist on the same group 9A line from the center of the spinneret, and the discharge holes are arranged in approximately one row on the circumference so that the distances from the center of the spinneret are equal. is preferred.
また、本発明では平均孔間隔を２ｍｍ以下とする必要が
ある。本発明でいう吐出孔の平均孔間隔とは第２図Ａ、
Ｂに示すように１つの円形導入孔中の吐出孔の孔間隔Ω
１および隣りあう円形導入孔間に存在する吐出孔の孔間
隔Ω１−等、全ての吐出孔間隔の総和を（全吐出孔数−
１）で除した値を意味する、ただし、第４図に示すよう
に、分離帯５を設け、円形導入孔をブロック状に配置し
た場合は、分離帯５の幅Ｗを除いた長さから算出する。Further, in the present invention, the average hole spacing must be 2 mm or less. The average hole spacing of the discharge holes in the present invention is as shown in FIG.
As shown in B, the hole spacing Ω of the discharge holes in one circular introduction hole
1 and the hole interval Ω1- of the discharge holes existing between adjacent circular introduction holes, etc., the sum of all the discharge hole intervals (total number of discharge holes -
1). However, when the separation strip 5 is provided and the circular introduction holes are arranged in a block shape as shown in Fig. 4, the value divided by the width W of the separation strip 5 is calculated as calculate.
本発明では吐出孔群を環状に配置するがゆえに平均孔間
隔が２ｍｍを越えると、多フィラメント化が困難となり
本発明の目的を達成することができない。紡糸口金面積
をあまり大きくしないで、効率よく多フィラメントを製
造するためには、平均孔間隔は１．５ｍｍ以下であるこ
とがより好ましい。In the present invention, since the discharge hole group is arranged in an annular manner, if the average hole interval exceeds 2 mm, it becomes difficult to obtain a multifilament structure, and the object of the present invention cannot be achieved. In order to efficiently produce multifilaments without increasing the spinneret area too much, the average hole spacing is more preferably 1.5 mm or less.
本発明において、従来実施されていた吐出孔の孔間隔よ
りも極めて狭い孔間隔でも、安定した紡糸性が得られる
理由については次のように考えられる。The reason why stable spinnability can be obtained in the present invention even with an extremely narrower hole spacing than the conventional discharge hole spacing is considered to be as follows.
すなわち、フィラメント数が少なく、吐出孔間隔が十分
とれる（１０ｍｍ以上）場合は、フィラメントの周囲に
発生する随伴気流は互いに干渉することがない。しかし
、吐出孔間隔が５ｍｍ以下になった場合、隣接するフィ
ラメント間の随伴気流は互いに干渉するようになり、気
流の乱れが発生して糸ゆれが大きくなる。しかしながら
、本発明のごとく、平均孔間隔が２ｍｍ以下になる程に
孔間隔を狭くしてゆくと、随伴気流が個々のフィラメン
トに発生するのではなく、複数のフィラメントに対し、
層状に発生する。この効果によって、フィラメント間の
干渉が減少し、紡糸安定性が向上するものと考えられる
。That is, when the number of filaments is small and the discharge holes are sufficiently spaced (10 mm or more), the accompanying air currents generated around the filaments do not interfere with each other. However, when the discharge hole interval is 5 mm or less, the accompanying airflow between adjacent filaments comes to interfere with each other, causing airflow turbulence and increasing yarn wobbling. However, as in the present invention, when the hole spacing is narrowed to the point where the average hole spacing is 2 mm or less, the accompanying airflow does not occur in each filament, but in multiple filaments.
Occurs in layers. It is thought that this effect reduces interference between filaments and improves spinning stability.
これは、本発明のように１つの円形導入孔に複数の吐出
孔を配置することよって、はじめて達成できるのである
。This can only be achieved by arranging a plurality of discharge holes in one circular introduction hole as in the present invention.
また本発明においては、溶融重合体による紡糸口金の背
面圧力や、紡糸口金パックを組み立てる際の圧力に耐え
る紡糸口金であることが必要であり、厚さ５ｍｍ以上、
好ましくは厚さ１ ｏｍｍ以上の平板状紡糸口金を好適
に用いることができる。In addition, in the present invention, the spinneret must be able to withstand the back pressure of the spinneret due to the molten polymer and the pressure when assembling the spinneret pack, and must have a thickness of 5 mm or more,
Preferably, a flat spinneret having a thickness of 1 om or more can be suitably used.
また、本発明では、円筒型冷却装置を採用することが、
フィラメントの均一性向上や紡糸性向上の面から好まし
い。円筒型冷却装置としては、内径が吐出孔群の外接円
より１０〜１５０ ｍｍ大きく、走行糸条に対し直交方
向から、上向き６０°までの範囲で、該糸条の中心に向
けて冷却風を吹き付けるタイプであることが、吐出され
た各フィラメントの固化点を安定させ、フィラメント間
の均一性を向上せしめる上で好ましい。Further, in the present invention, the use of a cylindrical cooling device allows
This is preferable from the viewpoint of improving filament uniformity and spinnability. As a cylindrical cooling device, the inner diameter is 10 to 150 mm larger than the circumscribed circle of the discharge hole group, and the cooling air is directed toward the center of the yarn from a direction perpendicular to the running yarn to an angle of 60 degrees upward. A spray type is preferable because it stabilizes the solidification point of each discharged filament and improves the uniformity among the filaments.
本発明でいう熱可塑性重合体とはポリエステルやポリア
ミドに代表される溶融紡糸可能な重合体のことである。The thermoplastic polymer as used in the present invention refers to a melt-spun polymer represented by polyester and polyamide.
［実施例］
以下本発明を実施例で、より具体的に説明する。なお、
実施例における極限粘度［η］は試別をＯ−クロロフェ
ノール中で溶解し、２５°°Ｃで測定した値である。[Example] The present invention will be described in more detail below with reference to Examples. In addition,
The intrinsic viscosity [η] in the examples is a value measured at 25°C after dissolving a sample in O-chlorophenol.
実施例１
極限粘度［η］ ０．６４のポリエチレンテレフタレ
ートを紡糸温度３００ ’Ｃで溶融したのち、紡糸口金
として、直径１００ｍｍφ、厚さ１０ｍｍ、吐出孔孔径
０．１ｍｍφの他、第１表に示す配列の平板状口金を用
い、吐出孔１孔当りの吐出量０．０５ｇ／ｍｉｎ、紡糸
速度３０００ ｍ／ｍｉｎの条件下でフィラメントデニ
ール０．１５デニールのフィラメントを巻き取った。Example 1 After melting polyethylene terephthalate with an intrinsic viscosity [η] of 0.64 at a spinning temperature of 300'C, a spinneret having a diameter of 100 mmφ, a thickness of 10 mm, a discharge hole diameter of 0.1 mm, and the like shown in Table 1 was prepared. A filament having a filament denier of 0.15 denier was wound up using an arrayed flat plate-shaped nozzle under conditions of a discharge rate of 0.05 g/min per discharge hole and a spinning speed of 3000 m/min.
なお、冷却装置として、内径が吐出孔群の最外周ＰＣＤ
（７５ｍｍφ）より２０ｍｍ大きく、上向き４５°で糸
条の中心に向けて冷却風を吹きつける円筒型冷却装置を
用いた。In addition, as a cooling device, the inner diameter is the outermost periphery PCD of the discharge hole group.
A cylindrical cooling device was used that was 20 mm larger than (75 mmφ) and blew cooling air toward the center of the yarn at an upward angle of 45 degrees.
紡糸結果を第１表に示した。The spinning results are shown in Table 1.
第１表中、実験Ｎｏ、 １〜３および６は本発明の効果
を明確にするための比較例である。In Table 1, Experiment Nos. 1 to 3 and 6 are comparative examples for clarifying the effects of the present invention.
実験Ｎα１．２はいずれも複数配列のため、配列内周部
が冷却不足となって固化点が紡糸口金から遠ざかるとと
もに、長時間巻き取る間に糸切れが発生した。実験Ｎｏ
、 ３は１つの円形導入孔の底部に３孔の吐出孔を設け
たものの、紡糸口金中心からの同−放銅線上に吐出孔を
配置させたため、紡糸口金中心に近いフィラメントが冷
却不足となって糸切れした他、糸ゆれが大きく、フィラ
メント同志の融着も発生した。実験Ｎ０９６は最小孔間
隔が吐出孔径の２倍未満で、吐出孔間隔が狭すぎるため
、フィラメント同志が融着し、紡糸性が著しく悪かった
。In Experiment Nα1.2, since multiple yarns were arranged, the inner circumference of the array was insufficiently cooled, and the solidification point moved away from the spinneret, and yarn breakage occurred during long winding. Experiment No.
, 3 had three discharge holes at the bottom of one circular introduction hole, but because the discharge holes were arranged on the same copper wire from the center of the spinneret, the filament near the center of the spinneret was not sufficiently cooled. In addition to the thread breakage, the thread wobbled significantly and filaments fused together. In Experiment No. 096, the minimum hole interval was less than twice the discharge hole diameter, and the discharge hole interval was too narrow, so the filaments fused together and the spinnability was extremely poor.
一方、本発明の要件を満足する実験Ｎ（１４，５からは
紡糸性の良好なフィラメントが得られた。On the other hand, filaments with good spinnability were obtained from Experiment N (14.5), which satisfied the requirements of the present invention.
（以下余白）
第
１
表
実施例２
極限粘度［η］ ０．６４のポリエチレンテレフタレ
ートを紡糸温度２９０’ＣＴ−溶融した後、紡糸口金と
して、第４図に示す配置で、直径１００ｍｍφ、厚さ１
５ｍｍの他、第２表に示す条件の平板状紡糸口金を用い
て、］吐出孔当りの吐出量を１．２５ ｇ／ｍｉｎとし
て溶融吐出し、円筒冷却装置を用いて冷却固化させ、紡
糸速度３０００ｍ ／ｍｉｎで、紡糸口金のブロックご
とに別々に巻き取って、１３５デニール３６フィラメン
トの４木取紡糸を行なった。(Leaving space below) Table 1 Example 2 After melting polyethylene terephthalate with an intrinsic viscosity [η] of 0.64 at a spinning temperature of 290'CT, a spinneret with a diameter of 100 mm and a thickness of 1
5 mm, using a flat spinneret with the conditions shown in Table 2, melt and discharge with a discharge rate of 1.25 g/min per discharge hole, cool and solidify using a cylindrical cooling device, and reduce the spinning speed. Each block of the spinneret was wound separately at 3000 m 2 /min to perform 4-kidori spinning of 135 denier 36 filaments.
なお、円筒冷却装置として内径が吐出孔群の最外周ＰＣ
Ｄ（７７ｍｍφ）より６０ｍｍ大きく、多フィラメント
に対して直交吹き出しのものを用いた。紡糸中融着によ
り糸切れもなく、良好な紡糸性で多本数紡糸が実施でき
た。In addition, as a cylindrical cooling device, the inner diameter is the outermost periphery PC of the discharge hole group.
The one used was one that was 60 mm larger than D (77 mmφ) and had a blowout perpendicular to the multifilament. There was no yarn breakage due to fusion during spinning, and a large number of fibers could be spun with good spinnability.
（以下余白）
第
表
［発明の効果］
本発明によれば、１つの紡糸口金に多数の紡糸孔群を極
めてコンパクトに配し、多本取止が可能であるため、高
い生産性が得られるとともに、多様のフィラメントデニ
ールを高速度で安定して紡糸することが可能となる。ま
た、高度に密集した多フィラメントをフィラメント同志
の融着や、糸切れもなく安定した紡糸性で得ることがで
きる。(The following is a blank space) Table [Effects of the Invention] According to the present invention, a large number of spinning holes are arranged in one spinneret in an extremely compact manner, and it is possible to take out multiple spinning holes, resulting in high productivity. At the same time, it becomes possible to stably spin various filament deniers at high speed. In addition, highly dense multifilaments can be obtained with stable spinnability without fusion of filaments or breakage.
第１図は本発明の紡糸口金の背面の例を示す分拡大図、
第３図は第２図のＸ−Ｘ−断面図、第４図は本発明の紡
糸口金の背面の他の例を示す平面図である。
１：紡糸口金 ２二円形導入孔
３：吐出孔 ４：円形導入孔の底部５：分離帯FIG. 1 is an enlarged view showing an example of the back side of the spinneret of the present invention;
FIG. 3 is a sectional view taken along line XX in FIG. 2, and FIG. 4 is a plan view showing another example of the back surface of the spinneret of the present invention. 1: Spinneret 2 Two circular introduction holes 3: Discharge hole 4: Bottom of circular introduction hole 5: Separation zone
Claims (2)
実質的に一列に設け、該吐出孔間の最小孔間隔を吐出孔
径の２倍以上で、かつ吐出孔間の平均孔間隔を２ｍｍ以
下とし、前記円形導入孔を環状に配置せしめるとともに
、前記吐出孔群も環状に配置させることを特徴とする多
フィラメント紡糸口金。(1) A plurality of discharge holes with the same diameter are provided substantially in a row at the bottom of the circular introduction hole, and the minimum hole interval between the discharge holes is at least twice the discharge hole diameter, and the average hole interval between the discharge holes is A multifilament spinneret, characterized in that the diameter is 2 mm or less, and the circular introduction holes are arranged in a ring shape, and the discharge hole group is also arranged in a ring shape.
）記載の多フィラメント紡糸口金を用いることを特徴と
する溶融紡糸方法。(2) When melt spinning a thermoplastic polymer, claim (1)
A melt spinning method characterized by using the multifilament spinneret described in ).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1322166A JP2734700B2 (en) | 1989-12-11 | 1989-12-11 | Multifilament spinneret and melt spinning method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1322166A JP2734700B2 (en) | 1989-12-11 | 1989-12-11 | Multifilament spinneret and melt spinning method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03185106A true JPH03185106A (en) | 1991-08-13 |
| JP2734700B2 JP2734700B2 (en) | 1998-04-02 |
Family
ID=18140674
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1322166A Expired - Fee Related JP2734700B2 (en) | 1989-12-11 | 1989-12-11 | Multifilament spinneret and melt spinning method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2734700B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007009368A (en) * | 2005-06-30 | 2007-01-18 | Toray Ind Inc | Spinneret and method for producing ultrafine fiber |
| JP2009074192A (en) * | 2007-09-19 | 2009-04-09 | Toray Ind Inc | Method and apparatus for producing thermoplastic fiber |
| JP2010196219A (en) * | 2009-02-27 | 2010-09-09 | Toray Ind Inc | Method for producing extremely fine synthetic fiber comprising multiple fiber yarn, and device for producing the same |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52128711U (en) * | 1976-03-24 | 1977-09-30 | ||
| JPS5378314A (en) * | 1976-12-20 | 1978-07-11 | Teijin Ltd | Method of producing multifilament yarn |
| JPS5590609A (en) * | 1978-12-26 | 1980-07-09 | Nippon Ester Co Ltd | Melt spinning of ultrafine multifilament yarn |
-
1989
- 1989-12-11 JP JP1322166A patent/JP2734700B2/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52128711U (en) * | 1976-03-24 | 1977-09-30 | ||
| JPS5378314A (en) * | 1976-12-20 | 1978-07-11 | Teijin Ltd | Method of producing multifilament yarn |
| JPS5590609A (en) * | 1978-12-26 | 1980-07-09 | Nippon Ester Co Ltd | Melt spinning of ultrafine multifilament yarn |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007009368A (en) * | 2005-06-30 | 2007-01-18 | Toray Ind Inc | Spinneret and method for producing ultrafine fiber |
| JP4725213B2 (en) * | 2005-06-30 | 2011-07-13 | 東レ株式会社 | Spinneret and method for producing ultrafine fiber |
| JP2009074192A (en) * | 2007-09-19 | 2009-04-09 | Toray Ind Inc | Method and apparatus for producing thermoplastic fiber |
| JP2010196219A (en) * | 2009-02-27 | 2010-09-09 | Toray Ind Inc | Method for producing extremely fine synthetic fiber comprising multiple fiber yarn, and device for producing the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2734700B2 (en) | 1998-04-02 |
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