JPS6189317A - Production of aromatic polyamide fiber - Google Patents

Abstract

PURPOSE:An aromatic polyamide yarn containing a specific recurring unit as a major component is flatly opened into a specified width and drawn at elevated temperature to avoid fusion between filaments and to effect uniform heating whereby the titled fiber of high quality with high strength and high modulus. CONSTITUTION:A yarn of aromatic polyamide containing more than 80mol% of polymer recurring unit of formula I Ar1, Ar2 are aromatic residue of formula II and formula III, all or partial hydrogen atoms of which may be substituted with halogens or lower alkyls is flatly opened before drawing so that the yarn width after drawing may become 1:1-10 times that before drawing and drawn in 1 or more stages at maximum temperature over 400 deg.C at total draw ratio of higher than 6 to give the objective fiber.

Description

【発明の詳細な説明】 本発明は芳香族ポリアミド繊維の製造方法に関するもの
である、更に詳しくは、特定のポリマー繰返し単位から
なる実質的にパラ配向の芳香族ポリアミドの巣条を高温
下で高倍率に延伸して、優れた品位の高強力高モジユラ
ス芳香族ポリアミド繊維を良好な工程調子にて製造する
方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing aromatic polyamide fibers, and more particularly, the present invention relates to a method for producing aromatic polyamide fibers, and more particularly, the present invention relates to a method for producing aromatic polyamide fibers, and more particularly, the present invention relates to a method for producing aromatic polyamide fibers, and more particularly, the present invention relates to a method for producing aromatic polyamide fibers. The present invention relates to a method for producing high-strength, high-modulus aromatic polyamide fibers of excellent quality by stretching the fibers at a suitable processing rate.

従来技術 近年、産業用の合＃：繊維に対する俊才が高度化し、特
に高強力高モジユラス化の要請に対し、梅りの新規な繊
維素材がＧ？］発されつつある・ それらのうち、成る種の芳香族ポリアミド繊維、殊に英
国特許第１５０１９４８号明細書に記載のようなポリア
ミド緑返し単位の一部にエーテル結合を含む実質的にパ
ラ配向の芳香族コポリアミドの繊維にあっては、その性
能を発現させるため、糸条を４００℃以上の最高延伸温
度で６倍以上の全延伸倍率に１段又は２段以上で延伸す
る方法が採用される。この場合、該糸条はネックを生ず
ることなく徐々に延伸され、所４１１７０−延伸の形態
をとる。Conventional technology In recent years, the talent for industrial composite fibers has become more sophisticated, and in response to the demand for high strength and high modulus, new fiber materials such as Umeri have been developed. Among them, some aromatic polyamide fibers, particularly those having substantially para-oriented fibers containing ether bonds in a part of the polyamide greening units, such as those described in British Patent No. 1,501,948, are being developed. For aromatic copolyamide fibers, in order to develop their performance, a method is adopted in which the yarn is stretched in one or two or more stages to a total stretching ratio of 6 times or more at a maximum drawing temperature of 400°C or higher. Ru. In this case, the yarn is drawn gradually without necking and takes the form of 41170-drawing.

ところで、芳香族ポリアミドの糸条を４００℃以上のよ
うな高温下で延伸を行うと、該糸条を構成する繊維は延
伸時に著しく軟化するため、単繊維間でのＦ＄着現象が
さけられな−・。By the way, when a thread of aromatic polyamide is drawn at a high temperature such as 400° C. or higher, the fibers constituting the thread soften significantly during drawing, so that the F$ adhesion phenomenon between single fibers can be avoided. What?

特に、＃糸条を構成する単繊維の数が多くなると融着は
ますます増太し、得られる延伸糸は著しく柔軟性の低い
低品位のものとなってしまう。また、このように糸条が
著しく軟化した状態で延伸する場合、糸条を均一に加熱
することが特に重要であり、もし加熱が均一に行われな
いと工程調子が低下する。In particular, as the number of single fibers constituting the # yarn increases, the fusion increases further, resulting in the resulting drawn yarn being of low quality with extremely low flexibility. Furthermore, when drawing the yarn in such a significantly softened state, it is particularly important to uniformly heat the yarn, and if heating is not performed uniformly, the process performance will deteriorate.

発明の目的 本発明の主たる目的は、ｍ１述の如き芳香族ポリアミド
の糸条を高温下で延伸を行う際に生ずる単繊維間の融氷
を防止すると共に、延伸時に個々の単繊維に対して均一
に熱を与えることにより、高品位の高強力高モンユラス
芳香族ポリアミド繊維を優れた工程調子で製造する方法
を杵供することにある。Purpose of the Invention The main purpose of the present invention is to prevent ice melting between single fibers that occurs when drawing an aromatic polyamide yarn as described in m1 under high temperature, and to prevent ice melting between individual single fibers during drawing. The object of the present invention is to provide a method for producing high-grade, high-strength, high-monylus aromatic polyamide fibers with excellent process conditions by uniformly applying heat.

発明の構成 前述の目的は１本発明に従い１％定の芳香族ポリアミド
からなる糸条を、最高延伸温度４００℃以上にて、６倍
以上の全延伸倍率に１段又は２段以上で延伸して間強力
高モジュジスの芳香族ポリアミド繊維を製造する方法に
おいて、４００℃以上の温度で延伸を行う除に、延伸さ
れる糸条を扁平状に拡げ、かつ延伸償前の糸条の翳に対
する延伸直稜の糸条の幅が１．１〜１０倍となるように
開繊して延伸することＫよって達成される。Structure of the Invention The above-mentioned object is to draw a yarn made of 1% aromatic polyamide according to the present invention in one or two or more stages at a maximum drawing temperature of 400°C or higher to a total stretching ratio of 6 times or more. In a method for producing aromatic polyamide fibers with high tensile strength and high modulus, in addition to drawing at a temperature of 400°C or higher, the thread to be drawn is expanded into a flat shape, and the thread is stretched against the shadow of the thread before stretching and compensation. This is achieved by opening and drawing the straight-edge yarns so that the width thereof becomes 1.1 to 10 times as large.

本発明の方法が適用される芳香族ポリアミドは、ポリマ
ー繰返し単位の８０モル％以上が下記の繰返し単位： Ｎｌ１−Ａｒｌ−ＮＨＣＯＡｒｔ　　ｃｏ−で構成され
る実質的にパラ配向の芳香族ポリアミドであればよいが
、なかでも、前記Ａｒ、　。The aromatic polyamide to which the method of the present invention is applied is a substantially para-oriented aromatic polyamide in which 80 mol% or more of the polymer repeating units is composed of the following repeating unit: Nl1-Arl-NHCOArt co- Among them, the above-mentioned Ar.

Ａｒ、の合計の８０モルタ６以上が、次のような芳香族
残基（４）及びの）もしくは（Ｂ′）からなり、かつ（
刊もしくは（Ｂ′）の比率が１０〜４０％を占める芳香
族コポリアミドが好適である。80 molta 6 or more of the total of Ar, consists of the following aromatic residues (4) and) or (B'), and (
Aromatic copolyamides having a proportion of 10% to 40% are preferred.

→−（Ａ） つ−０−＠−ＣＢ’） このような芳香族コポリアミドの製造方法の詳細につい
ては、英国牧許第１５０１９４８号明細書、米国特許第
３７：１８９６４号明細書、特開昭４９−１００３２２
号公報等に記載されている。→-(A) -0-@-CB') For details of the method for producing such an aromatic copolyamide, see British Patent No. 1501948, U.S. Patent No. 37:18964, JP Showa 49-100322
It is stated in the publication number etc.

好適な芳香族ポリアミドの例としては、次の３他の七ツ
マ一単位より６ｎｆＮ、されるコポリアミドがあげられ
る。Examples of suitable aromatic polyamides include the following copolyamides of 6nfN from 3 other 7 units.

１）　−緒一◎−Ｎｕ−１０〜４０モル％−ＮＨ−■−
ｏ−＠−Ｎ）ｌ−１０〜４０モル％１１ｉ　）　　−Ｃ
ｏ−■−ＣＯ−５０モル％このような芳香族ポリアミド
は、その溶液を紡糸口金から押出して水性凝固浴中で凝
固させて糸姿となし、該糸条（＄延伸糸）を最高延伸温
度４００℃以上、好ましくは４２０〜５５０℃の高温で
、全延伸倍率が６倍以上となるように１段又は２段以上
で延伸することによって、前強力高モジュラスの繊維と
なる。1) -Oichi◎-Nu-10-40 mol%-NH-■-
o-@-N)l-10 to 40 mol%11i) -C
o-■-CO-50 mol% Such aromatic polyamide is extruded from a spinneret and coagulated in an aqueous coagulation bath to form a thread, and the thread ($ drawn thread) is heated to the highest drawing temperature. By stretching in one or more stages at a high temperature of 400° C. or higher, preferably 420 to 550° C., so that the total stretching ratio is 6 times or higher, a fiber with high pre-strength and high modulus is obtained.

前記芳香族ポリアミドを浴Ｐｊｒシて紡糸原液を調製す
るだめの溶媒としては、アミド系ｋｖ媒が好ましく１例
えば、Ｎ−メチル−２−ピルリドン（ＮＭＰ）、Ｎ、Ｎ
’−ジメチル７セト７ミド（ＤＭＡ　）　、　Ｎ、Ｎ’
−ジノチルホルムアミド（ＤＭＦ）、テトラメチル尿素
（ＴＭＵ）が好適である。これらの溶媒中には、周ＡＡ
律表第１族又は第■族の金属のハロゲン化物を含有せし
めてもよい。このようなハロゲン化物としては、例えば
、塩化リチウム、塩化カルシウム等が特に好適である。The solvent for preparing the spinning dope by bathing the aromatic polyamide is preferably an amide-based kv medium. For example, N-methyl-2-pyridone (NMP), N,N
'-dimethyl7ceto7mide (DMA), N,N'
-Dinotylformamide (DMF) and tetramethylurea (TMU) are preferred. In these solvents, surrounding AA
It may also contain a halide of a metal of Group 1 or Group Ⅰ of the Table of Contents. As such halides, for example, lithium chloride, calcium chloride, etc. are particularly suitable.

一方、紡糸口金から押出された糸条を凝固させる水性凝
固浴とし【は、紡糸原液となる芳香族ポリアミド溶液中
のアミド系溶媒と同種の溶媒を含む水性凝固浴が好１し
く、凝固浴中の溶媒濃度は芳香族ポリアミドのａｉ類や
紡糸条件等によっても異るが、一般に約５〜５０重無先
の範囲内が好ましい。なお、この凝固浴中には前記のハ
ロゲン化物を含有せしめてもよい。On the other hand, the aqueous coagulation bath for coagulating the yarn extruded from the spinneret is preferably an aqueous coagulation bath containing the same type of solvent as the amide solvent in the aromatic polyamide solution which becomes the spinning dope; Although the solvent concentration varies depending on the ai of the aromatic polyamide, the spinning conditions, etc., it is generally preferred to be within the range of about 5 to 50%. Incidentally, the above-mentioned halide may be contained in this coagulation bath.

紡糸に際しては、紡糸口金を凝固浴中に設けて紡糸原液
を直接凝固浴中に押出してもよいが、紡糸口金を凝固浴
上面の数關〜数α上方に設けて紡糸原液を−たん空気中
に押出した後、凝固浴中に導入するのが好ましい。During spinning, a spinneret may be placed in a coagulation bath to extrude the spinning dope directly into the coagulation bath. After extrusion, it is preferably introduced into a coagulation bath.

凝固浴から引上げられた湿潤状態の糸条は。The wet yarn is pulled up from the coagulation bath.

水洗により溶媒が除去される。この水洗は定長状態で行
われるか、又は湿潤状態で１．０５〜２．０倍に予ｆｌ
延伸するのと併行して行われる。水洗の過程でこのよう
な若干の予備延伸を行うのは、水洗効皐を上げるばかり
でなく。The solvent is removed by washing with water. This water washing is carried out in a constant length state or in a wet state with a pre-fl.
This is done in parallel with stretching. Performing this slight pre-stretching during the washing process not only increases the effectiveness of washing.

個々の単繊維の断面の真円性を向上させるのに有効であ
る。It is effective in improving the roundness of the cross section of each single fiber.

水洗された糸条は、′３１ｉ９常、定長状態又は若干の
緊張もしくに若干の弛緩状態で乾燥される。乾燥時の緊
張率又は弛緩率は高々１０％である。The washed yarn is dried in a constant length state or in a slightly tensioned or slightly relaxed state. The tension or relaxation rate during drying is at most 10%.

前述の如く乾燥された芳香族ポリアミドの糸条は、套装
に応じてさらに４００℃未満の温度で１．５〜３倍に予
備延伸した後、４００℃以上（好ましくは４２０〜５５
０℃）の高温下での延伸に供せられるが、核糸条はこの
高温延伸において高い温度のために軟化し、単繊維が互
いに融着して工程調子が慈化し、さらに得られた延伸糸
の品質も低下するという問題がある。The aromatic polyamide yarn dried as described above is further pre-stretched by 1.5 to 3 times at a temperature of less than 400°C, depending on the wrapping, and then stretched to a temperature of 400°C or higher (preferably 420 to 55°C).
The core yarn is subjected to drawing at a high temperature (0°C), but during this high-temperature drawing, the core yarn softens due to the high temperature, the single fibers fuse together, and the process condition deteriorates. There is also the problem that the quality of the yarn is reduced.

このような問題を解決するために、湿潤状態の糸条或い
は乾燥後の糸条に、予め不活性な無機微粉末を延伸助剤
として付着せしめ。In order to solve this problem, an inert inorganic fine powder is attached in advance to the wet yarn or the dry yarn as a drawing aid.

続いて４００℃以上の温度で延伸することＫより、前記
の融ｙ＃ｊ現象を抑制する方法が開発された、 前記無機微粉末としては、平均粒径が２０ミクｐン以下
、％Ｋｉｏミクｐン以下の、硼酸アルミニウム１硅酸マ
グネシウム！グラファイト、タルク、シリカ、マイカ等
の微粉末が好適であり、これらの微粉末は単一成分で使
用してもよく、２種以上併用してもよ（・。Subsequently, a method for suppressing the melting phenomenon was developed by stretching at a temperature of 400° C. or higher. Aluminum borate monomagnesium silicate with less than pn! Fine powders of graphite, talc, silica, mica, etc. are suitable, and these fine powders may be used as a single component, or two or more types may be used in combination.

これらの微粉末は水性分散浴中で水和して）　　　　′
ロイド状になるものや、単に分散するだげのものもある
が、いずれも使用可能である。These fine powders are hydrated in an aqueous dispersion bath)
There are some that form a loid and others that simply disperse, but any of them can be used.

前記の微粉末な糸条に均一に付着せしめるには、予め微
粉末を水等の分散媒に分散させた浴を用意し、湿潤状態
にある水洗された糸条を分散浴に浸漬させた後乾燥を行
う方法を採用するのが好ましい。なお、微粉末の分散を
均一に行うため１機又は無機の分散を浴中に添加したり
、或いは、糸条の収束性を安定化させるため帯電防止剤
を併用することもできる。In order to uniformly adhere the above-mentioned fine powder to the yarn, prepare a bath in which the fine powder is dispersed in a dispersion medium such as water, and after immersing the wet, water-washed yarn in the dispersion bath. It is preferable to adopt a method that involves drying. Incidentally, in order to uniformly disperse the fine powder, an organic or inorganic dispersion may be added to the bath, or an antistatic agent may be used in combination to stabilize the convergence of the yarn.

無機微粉末の糸条への付着量は、繊維重量を基準にして
０．１〜３重量九が好適である。The amount of the inorganic fine powder attached to the yarn is preferably 0.1 to 3% by weight based on the fiber weight.

付着量が少な過ぎると効果が減少し、多過ぎると繊維が
微粉末で汚れ後加工工程でのトラブルの原因となり易い
。If the amount of adhesion is too small, the effect will be reduced, and if it is too large, the fibers will become fine powder and will likely cause trouble in the post-processing process.

このように無機微粉末を芳香族ポリアミド糸条に付着さ
せて４００℃以上の温度で高温延伸を行うと融着現象が
かなり防止され工程調子も良好化するものの、未だ十分
満足できる水準に達しない。特に、延伸断糸や単糸切れ
に基く毛羽発生等を極力防止するためには、更に飛躍的
な改善が必扱である。In this way, by attaching inorganic fine powder to aromatic polyamide yarn and performing high-temperature stretching at a temperature of 400°C or higher, the fusion phenomenon is considerably prevented and the process condition is improved, but it still does not reach a fully satisfactory level. . In particular, further dramatic improvements are required in order to prevent as much as possible the occurrence of fluff due to stretch yarn breakage or single yarn breakage.

本発明の方法では、かかる高温延伸において、延伸され
る糸条を偏平状に拡げ、かつ。In the method of the present invention, in the high-temperature drawing, the yarn to be drawn is expanded into a flat shape, and.

延伸直前の糸条の幅に対する延伸直後の糸条の幅の比が
１６１〜１０．好ましくは１．５〜５になるように開繊
して延伸するという特殊な拡＠開繊状態での高温フロー
延伸を採用することＫより、ｈ着がはｙ完全に防止され
、かつ工程調子も大幅に改善される、 従来より一般に知られているポリエステルやナイロンの
糸条の代表的な延伸方法においては、延伸調子を向上さ
せるには出来るだゆ糸条を収束さすｊ３４黴算基噴ユ燻
７＼）う。The ratio of the width of the yarn immediately after stretching to the width of the yarn immediately before stretching is 161 to 10. Adopting high-temperature flow drawing in a special spreading state where the fibers are opened and drawn to preferably 1.5 to 5. By using high temperature flow drawing in a special spreading state, it is possible to completely prevent wear and improve process control. In the typical drawing method for polyester and nylon yarns that have been generally known, in order to improve the drawing condition, it is necessary to converge the remaining yarns. Smoked 7\) U.

これは単繊維が糸条から遊離すると単繊維切れが発生し
易くなるので糸条は可能な限り密に収束している方が好
ましいからである。そして、糸条の収束性を向上させる
ために、糸条に油剤を付与したり突気の役瓦による交絡
（インターレース）を付与した後ＶＣｔＪ糸条を延伸す
るのが常識とされている。また、スＪし テーブルファイバー表造トウのように単繊維数が著しく
多い場合は、均一加熱を目的として県東即ちトウを拡げ
て延伸する方法が採用されているが、延伸直前のトウ幅
に比べて延伸直後のトウ幅は変化しないか若干狭くなる
・これは糸条が延伸されると単繊維の面径が小さくなる
から糸すが収束力（単繊維間の油剤による″！Ｉｊ清力
や単繊維間のわずかの絡みによる拘束力等）をもつ限り
延伸後の糸条幅は小さくなるのが通常である。This is because if single fibers are separated from the yarn, single fiber breakage is likely to occur, so it is preferable that the yarns are converged as closely as possible. In order to improve the convergence of the yarn, it is common knowledge to draw the VCtJ yarn after applying an oil agent to the yarn or interlacing the yarn with a gusset. In addition, when the number of single fibers is extremely large, such as table fiber surfaced tow, a method is adopted in which the tow is stretched and stretched for uniform heating, but the width of the tow immediately before stretching is In comparison, the tow width immediately after drawing does not change or becomes slightly narrower. This is because when the yarn is drawn, the surface diameter of the single fibers becomes smaller, so the yarn convergence force (due to the oil agent between the single fibers) The width of the yarn after drawing is usually small as long as it has a binding force due to slight entanglement between single fibers, etc.).

これに対し、本発明方法では、延伸される糸条を偏平状
に拡げ、かつ延伸の過程において更に糸条の幅を増大さ
せるという従来全く考えられなかった特殊な延伸方式に
より良好な延伸が実現される。しかも、延伸に供給され
る前の糸条は実質的に単繊維間の交絡のないものである
。本発明方法におけるこのような延伸過程での漸進的な
開繊により単繊維間の圧着状態が軽減され、かつ糸条の
厚みが減少するので糸条の加熱が均一に行われるように
なり、その結果として融着防止及び工程調子の著しい改
善が達成される。従来の常識ではこのような拡幅開繊状
態で延伸することは延伸調子を悪化させる原因とされて
おり、本発明方法の如き単繊維間の融着防止、工程調子
の改善等の効果が生ずることは全（予測できない所であ
る。On the other hand, the method of the present invention achieves good drawing by using a special drawing method that was completely unthinkable in the past, in which the thread to be drawn is expanded into a flat shape and the width of the thread is further increased during the drawing process. be done. Moreover, the yarn before being supplied for drawing is substantially free from entanglement between single fibers. In the method of the present invention, the gradual opening during the drawing process reduces the pressure bond between single fibers and reduces the thickness of the yarn, so that the heating of the yarn is uniformly performed. As a result, significant improvements in prevention of fusion and process conditions are achieved. According to conventional wisdom, drawing in such a wide spread state causes deterioration of the drawing condition, but the method of the present invention has the effect of preventing fusion between single fibers and improving the process condition. is completely unpredictable.

本発明方法において延伸される糸条は、１００本以上の
単繊維からなる糸条が好適である。該糸条を扁平状に拡
げる度合は大きい方が良いが、実際上は、１０００本の
単繊維からなる糸条の場合は、厚さ方向に２〜５本の単
繊維が積重り【おり糸条の幅方向１ｃ　２００〜５００
本の単繊維が並んで、いるような扁平状にするのが好適
である。均一加熱の目的だけを考えると、１０００本の
単繊維がすべて横一列に並んでいる極限的な形状が有効
と考えられるが、現実には実施が困難であり糸条自体の
収束性も不安定になり易い。The yarn to be drawn in the method of the present invention is preferably a yarn consisting of 100 or more single fibers. The degree to which the yarn is expanded into a flat shape is better, but in reality, in the case of a yarn consisting of 1000 single fibers, 2 to 5 single fibers are piled up in the thickness direction. Width direction of strip 1c 200-500
It is preferable to make it into a flat shape in which the single fibers of a book are lined up. Considering only the purpose of uniform heating, an extreme shape in which all 1000 single fibers are lined up horizontally in a row is considered effective, but in reality this is difficult to implement and the convergence of the yarn itself is unstable. easy to become

本発明方法において、糸条を扁平状に拡げるＫは、紡糸
された糸条をローラーで平行的に搬送しつつ水洗、乾燥
を行うだけでも十分な扁平状の糸条となるが、套装に応
じて、ニップローラーで糸条を押圧したり、移動しつつ
ある糸条を曲率を有する板や棒に押圧して扁平の度合を
増加させてもよい。In the method of the present invention, K for spreading the yarn into a flat shape can be obtained by simply washing and drying the spun yarn while conveying it in parallel with rollers, but depending on the wrapping. Then, the degree of flatness may be increased by pressing the yarn with a nip roller or by pressing the moving yarn against a plate or rod having a curvature.

また、扁平状に拡げた糸条を開繊するには、糸条の有す
る静電気による単繊維間の反撥力を利用する。この静電
気による反撥力は小さいものであるから、従来のポリエ
ステルやナイｑン等のように高張力で延伸する場幸は。Furthermore, in order to open the filament spread into a flat shape, the repulsive force between single fibers due to the static electricity possessed by the filament is utilized. This repulsive force due to static electricity is small, so it is not possible to stretch it under high tension like conventional polyester or cotton.

本発明方法の如き漸進的な開繊は生じない。Gradual opening as in the method of the invention does not occur.

本発明方法では、この漸進的な開繊を適切な程度に制御
して、延伸直前の糸条の幅に対する延伸直後の糸条の幅
の比を１．１〜１０（好ましくは１６５〜５．０）にす
る必要がある。In the method of the present invention, this gradual opening is controlled to an appropriate degree so that the ratio of the width of the yarn immediately after drawing to the width of the yarn immediately before drawing is 1.1 to 10 (preferably 165 to 5.0). 0).

ここで、延伸直前直後の糸条の幅は、４００℃以上の温
度で延伸する工程において、それぞれ熱板或いは気体浴
等の加熱手段に入る直前の糸条の幅及び同加熱手段を出
た直後の糸条の幅を言う。Here, the width of the yarn immediately before and after drawing refers to the width of the yarn immediately before it enters a heating means such as a hot plate or gas bath, and the width of the yarn immediately after leaving the heating means, respectively, in the drawing process at a temperature of 400°C or higher. refers to the width of the yarn.

延伸の直前と直後における糸条の幅の比が１．１未満で
は、延伸過程でのｌ＋ｌＲが不十分で単繊維間の融着が
生じ易く、工程調子も悪化する。一方、前記の比が１０
を超えると糸条の開繊が大き過ぎて、単繊維が糸条の束
から遊離して単繊維切れが生じ易く、巻取後の糸条パッ
ケージの端面の毛羽が増加して製品の品位が悪化する。If the ratio of the widths of the yarns immediately before and after drawing is less than 1.1, l+lR during the drawing process will be insufficient and fusion between single fibers will easily occur, resulting in poor process performance. On the other hand, the above ratio is 10
If the yarn exceeds 100%, the opening of the yarn will be too large, and single fibers will be easily separated from the yarn bundle, resulting in single fiber breakage.Fuzz will increase on the end surface of the yarn package after winding, and the quality of the product will deteriorate. Getting worse.

このような漸進的な開繊の程度を前記範囲に調整するに
は、次のような開繊を助長する手段と開繊を抑制する手
段とを適宜組合せることにより実現することができる。Adjustment of the degree of such gradual fiber opening within the above range can be achieved by appropriately combining the following means for promoting fiber opening and means for suppressing fiber opening.

まず、漸進的な開繊を助長する手段としては、 １）タルク微粉末、シリカ微粉末、マイカ微粉末の少く
ともｌａからなる延伸助剤を糸条に付与する。First, as means for promoting gradual opening, 1) A drawing aid consisting of at least la of fine talc powder, fine silica powder, and fine mica powder is applied to the yarn.

２）ｆ燥後に糸条の揉みほぐしを行う。2) After f-drying, the yarn is massaged and loosened.

３）延伸張力を下げるような条件に設定する。3) Setting conditions to lower the stretching tension.

等の手段が挙げられる。Examples of such methods include:

−万、指通的な開繊を抑制する手段としては、 １）硅酸アルミニウム微粉末からなる延伸助剤を糸条に
付与する。-10000000000000000000000000000000000000000000000000000000000000000000000000000000000 nature nature to form, the method of suppressing finger opening is as follows: 1) A drawing aid made of aluminum silicate fine powder is applied to the yarn.

２）静電気を除去する。2) Eliminate static electricity.

等の手段が挙げられる。Examples of such methods include:

本発明方法を実施する場合は、これらの手段の幾つかを
巧みに組合せることＫより、延伸直前と直後の糸染幅の
比を１．１〜１０の範囲内の過当なで直に保つことがで
きる。When carrying out the method of the present invention, by skillfully combining some of these means, the ratio of the yarn dyeing widths immediately before and immediately after drawing is kept within the range of 1.1 to 10. be able to.

本発明方法において、糸条を４００℃以上の温度で延伸
するには、熱板による接触延伸或〜・は空気、水蒸気、
炭酸ガス、ｉ素ガス等の不活性ガス等の雰囲気中で行う
非接触延伸のいずれも採用できる。In the method of the present invention, in order to draw the yarn at a temperature of 400°C or higher, contact drawing with a hot plate or air, water vapor,
Any non-contact stretching performed in an atmosphere of an inert gas such as carbon dioxide gas or hydrogen gas can be employed.

延伸温度は、延伸のうち少くとも１段を４００℃以上（
好ましくは４２０〜５５０℃）とする必要がある。これ
は、前述の芳香族ポリアミドは、高分子の分子鎖が４１
直なため。The stretching temperature is 400°C or higher in at least one stage of stretching (
The temperature should preferably be 420 to 550°C). This is because the aromatic polyamide mentioned above has a polymer chain of 41
For Naoto.

最高延伸温度が４００℃未満では、十分な強力が発現し
ないからである。This is because if the maximum stretching temperature is less than 400°C, sufficient strength will not be developed.

本発明方法では、全部のＪｉｊ仲を４００℃以上の温度
で行う必要はなく、湿潤状態で１．０５〜２倍に予備延
伸したり、身に、４００℃未滴の温度で１．５〜３．５
倍に迫力０の予備坏：伸することも可能であるが、ｎ終
的には。In the method of the present invention, it is not necessary to carry out all the JIJ stretching at a temperature of 400°C or higher, and it is possible to pre-stretch to 1.05 to 2 times in a wet state, or to stretch it to 1.5 to 2 times at a temperature of 400°C. 3.5
Preparation with zero impact: It is possible to extend it, but in the end.

４００℃以上の温度で拡幅開繊状態にて延伸を行う必要
がある。It is necessary to draw the fibers in an expanded state at a temperature of 400° C. or higher.

なお、前述の如く４００℃以上の温度で苅伸するに当り
、熱板を用いて接触式で行つ８合、熱板の一部（例えば
両端）が４００℃未満となるような温度分布を有しても
よ（、また、不活性ガス中で非接触式で行う場合、雰囲
気の一部（例えば入口と出口近辺）が４００℃未満とな
るような温度分布を有してもさしつかえない。要は、実
質的な延伸を４００℃以上で行えばよい。In addition, as mentioned above, when stretching at a temperature of 400°C or higher, the temperature distribution is such that a part of the heating plate (for example, both ends) is less than 400°C when using a contact method using a hot plate. (Also, in the case of a non-contact method in an inert gas, there is no problem even if a part of the atmosphere (for example, near the inlet and outlet) has a temperature distribution such that the temperature is less than 400°C. In short, substantial stretching may be performed at 400°C or higher.

延伸倍□よ１，８：ゆ伸倍率Ｋｌ、：６倍以上、　　　
　；好ましくは８〜１２倍となるように設定する。Stretching ratio □ 1,8: Stretching ratio Kl: 6 times or more,
; Preferably, it is set to 8 to 12 times.

予備延伸を行う場合は、全延伸倍率が６倍以上となれば
４００℃以上の温度で延伸する段階での倍率は６倍未満
でもさしつかえない。When preliminary stretching is performed, as long as the total stretching ratio is 6 times or more, the stretching ratio at the stage of stretching at a temperature of 400° C. or higher may be less than 6 times.

このような本発明方法釦従って延伸された糸条は、必ｇ
！に応じ仕上剤処理、脱延伸助剤処理等を行った後、ボ
ビンに巻取られる。According to this method of the present invention, the drawn yarn must be
! After being subjected to finishing agent treatment, de-stretching aid treatment, etc. according to the requirements, it is wound onto a bobbin.

発明の作用及び効果 前述の如き本発明方法忙よれば、芳香族ポリアミド繊維
を糸条温度４００℃以上となるような著しく軟化した状
態で高倍率に延伸して優れた物性を発現させる際に、延
伸に８要な熱が均一に単繊維にゆきわたると共に、高温
での延伸過程における単繊維間の融着がはｙ完全に防止
され、しかも優れた工程調子で延伸を行うことが可能と
なる。Functions and Effects of the Invention According to the method of the present invention as described above, when aromatic polyamide fibers are stretched at a high magnification in a significantly softened state such that the yarn temperature is 400°C or higher to exhibit excellent physical properties, The heat required for drawing is uniformly spread over the single fibers, and fusion between the single fibers during the drawing process at high temperatures is completely prevented, and drawing can be carried out with excellent process conditions.

そして、得られた芳香族ポリアミド繊維は、強度及びモ
ンユラスが大きく、柔軟性にすぐれ、かつ毛調等も少い
ため、ゴムや樹脂の補強材をはじめ種々の用途に広く使
用することができる。The obtained aromatic polyamide fibers have high strength and monocularity, are excellent in flexibility, and have little hairiness, so they can be widely used in various applications including reinforcing materials for rubber and resins.

特に、好適な条件で製造された繊維は、２５ｇ／ｄｅを
超える高い強度と６６０９　／　ｄｅ以上の高いモジュ
ラスを示し、従来の芳香族ポリアミド繊維に比べて格段
にすぐれた物性を有する。In particular, fibers produced under suitable conditions exhibit high strength of over 25 g/de and high modulus of 6609/de or more, and have far superior physical properties compared to conventional aromatic polyamide fibers.

以下１本発明の方法を実施例によって更に詳しく説明す
る。なお、以下の例において用いる主な特性値は次の如
く測定される値である。The method of the present invention will be explained in more detail below with reference to Examples. Note that the main characteristic values used in the following examples are values measured as follows.

口）　ポリマーの固有粘度（ＩＶ） オストワルド型粘度管を用い、溶媒のみの流下時間をｔ
ｏ（秒）、ポリマーの希薄浴液の流下時間をｔ（秒）、
該希薄溶液中のポリマー濃度をｃ（ｇ／＃）とすると。Intrinsic viscosity (IV) of the polymer Using an Ostwald viscosity tube, the flow time of the solvent alone is t.
o (seconds), the flow time of the dilute polymer bath solution is t (seconds),
Let the polymer concentration in the dilute solution be c (g/#).

ｒｖ＝ノｎ（ｔ／ｌｏｌ／ｃ で表わされる。％に断らない限り、溶媒は９７．５％硫
酸＋　ｅ　””　０．５１　／　ｄｌとし、３０℃で測
定する。rv=non (expressed in t/lol/c). Unless otherwise specified, the solvent is 97.5% sulfuric acid + e"" 0.51/dl, and measurements are taken at 30°C.

（２）　　融着度 延伸された糸条のフイランド紅、数（Ｎ）のうち、融着
かなく、分離可能なフィラメント（ｊ２Ｄち完全に単繊
維として取り出すことのできるフィラメント）のＤ（ｎ
）を数え、次式で融着度を表わす。(2) Degree of fusion: Of the number (N) of the drawn yarn, D (n) of filaments that do not fuse and can be separated (j2D, filaments that can be completely taken out as single fibers).
) and express the degree of fusion using the following formula.

実施例１ 下記モノマ一単位 −ＮＨ−Ｊ＠−ＮＨ−２ｓモル先 −ｃｏ−（Ｃり−Ｃｏ−５０モル％ により構成される１、Ｖ、＝　３．１の芳香族コポリア
ミドを塩化カルシウム（ＣａＣ４）を含有する狸に６重
お九のポリマー濃度となるよう溶解せしめた浴液を、孔
径０．３重ｍ＋孔数２５０の紡糸口金から８３１１／分
の吐出速度で押出し、空気中を約１０ｍｍ走行させた後
、５０℃のＮＭＰ／水（３０／　７０　ｋ　Ｐｉ　９６
）の凝固浴中で凝固させ。Example 1 An aromatic copolyamide of 1, V, = 3.1 composed of the following monomer unit -NH-J@-NH-2s mole -co-(C-Co-50 mol%) was converted to calcium chloride. A bath liquid containing (CaC4) dissolved in a polymer concentration of 6 times 9 times was extruded through a spinneret with a hole diameter of 0.3 times m and a number of holes of 250 at a discharge rate of 8311/min, and After traveling about 10 mm, NMP/water (30/70 k Pi 96
) in a coagulation bath.

１１ｍ／分の速度で引き上げた。続いて、得られた凝固
糸を５０℃の水浴中で洗浄しつつ、階段的に１．３倍に
予備延伸し、絞りローラに通して表面付着水を除去し、
表ＩＫ示すような組成からなる延伸助剤の浴に約５秒間
不ルンンローラに懸けて浸漬し、次いで絞りｐ−ラに通
し。It was pulled up at a speed of 11 m/min. Subsequently, the obtained coagulated thread was pre-stretched stepwise to 1.3 times while being washed in a water bath at 50°C, passed through a squeezing roller to remove water adhering to the surface,
It was immersed in a bath of a drawing aid having the composition shown in Table IK for about 5 seconds by passing it over a wet roller, and then passing it through a squeeze roller.

延伸助剤分散液の付着した水洗糸を得た。引続いて該水
洗糸を表面温度が１２０℃の直径２０αの乾燥ローラと
直径３αのセパレートローラの組と２５０℃の直径１５
ｃｍの乾燥ローラと直径１．５ＣＩＪ１のセパレートロ
ーラの組にそれぞれ１０ターンと５タ一ン巻きつけて、
はば絶乾した糸となし、これを表面温度が５００℃、長
さ１ｍの熱板に接触させつつ、全延伸倍率が１１．０倍
となるように延伸して巻取った。A water-washed yarn to which the drawing aid dispersion was attached was obtained. Subsequently, the washed yarn was passed through a set of a drying roller with a diameter of 20α with a surface temperature of 120°C and a separate roller with a diameter of 3α and a diameter of 15 with a surface temperature of 250°C.
Wrap it around a set of a cm drying roller and a separate roller with a diameter of 1.5 CIJ1 for 10 turns and 5 turns, respectively.
The yarn was completely dried, and the yarn was stretched and wound at a total stretching ratio of 11.0 times while contacting a hot plate with a surface temperature of 500° C. and a length of 1 m.

各条件で１時間ずつ製糸テストを行ない、その結果を表
１に示す。A yarn spinning test was conducted for 1 hour under each condition, and the results are shown in Table 1.

実験点１では延伸助剤を付与しないため、延伸の直前に
対する直後の糸条幅の比（直後／直前）が１．１未満と
なり、単ｆ＃！維間の融着が激しく、工程Ｗ！子も悪く
、毛羽やループの発生も多かった。実験点２〜４ではフ
ィラメント間のタルクシこよる滑りとセパレートローラ
上でのほぐし作用により、糸間膠着が解除され、前記糸
条幅の比が１．１よりも大きくなり、単繊離間融着が激
減する。しかし、実験点２では糸条幅の比が１０倍を超
えてあまりに大きく、工程は不安定となり、断糸の発生
９毛羽、ループの増大を生じた。At experimental point 1, no drawing aid was applied, so the ratio of the yarn width immediately after drawing to that immediately after drawing (immediately/immediately before) was less than 1.1, and single f#! There is a lot of fusion between Ima and process W! The offspring were also poor, and there were a lot of fuzz and loops. At experimental points 2 to 4, the inter-yarn adhesion was released due to the sliding of the tars between the filaments and the loosening action on the separation roller, and the yarn width ratio became larger than 1.1, and the fusion between the single fibers was reduced. Decrease sharply. However, at experimental point 2, the yarn width ratio was too large, exceeding 10 times, and the process became unstable, resulting in yarn breakage, 9 fluffs, and an increase in loops.

実施例２ 実施例１と同じ芳香族ポリアミド溶液を、孔径０．２５
龍＋孔数１０００の紡糸口金から１１１１１／分の吐出
速度で押し出し空気中を７關走行させた後、温匹り０℃
、濃度３０重量九のＮＭＰ水浴液の凝固浴中で凝固させ
、３８．５ｍ／分の速度で引き上げた。続いて得られた
凝固糸を５０℃の水浴中で洗浄しつつ階段的に１．３倍
に延伸し、絞りローラーに通して表面付着水を除去し、
表２に示すような組成からなる霞度２ｔｆ＆％の延伸助
剤の水系分散浴に約１秒間浸漬し、絞りローラーに通し
延伸助剤の付着した水洗糸を得た。Example 2 The same aromatic polyamide solution as in Example 1 was prepared with a pore size of 0.25.
After extruding from a spinneret with 1000 holes at a discharge rate of 11111/min and running it in the air for 7 times, the temperature was 0°C.
The sample was coagulated in a coagulation bath of NMP water bath solution having a concentration of 30% by weight and pulled up at a speed of 38.5 m/min. Subsequently, the obtained coagulated thread was washed in a water bath at 50°C and stretched stepwise to 1.3 times, and passed through a squeezing roller to remove water adhering to the surface.
The yarn was immersed for about 1 second in an aqueous dispersion bath of a drawing aid having the composition shown in Table 2 and having a haze of 2 tf&%, and passed through a squeezing roller to obtain a water-washed thread with the drawing aid attached thereto.

表２　　延伸助剤の組成 タルク　　　　　　　　　　　８５部 硅酸アルミニウム　　　　　１５部 ポリエチレングリコール　　　７部 へキサメタリン酸ソーダ　　　　３部 次いで、この水洗糸を１２０℃の乾燥ローラーに３０回
巻きつけて乾゛燥した後、三角歯な有する一対のギヤー
ロールの間で乾燥した糸条のもみほぐしを行った。なお
、各ギヤーロールは直径８４ｍで円周上に４０個の三角
歯を有し【おり、三角歯の先端は曲率半径１ｎの丸みに
なるように仕上げである。ギヤーロールはお互にある深
さに噛み合っているが、この吻合の深さＫよって揉みほ
ぐしの程度を変化させる。＠み合いの深さは０鰭（噛合
なし）から１．５財まで変化させた。噛合が深（なると
糸条の揉みほぐしが強くなって、彼達するように４００
℃以上での延伸に於いて開繊し易くなる。Table 2 Composition of drawing aid Talc 85 parts Aluminum silicate 15 parts Polyethylene glycol 7 parts Sodium hexametaphosphate 3 parts The water-washed thread was then dried by winding it around a drying roller at 120°C 30 times, and then forming a triangular tooth. The dried yarn was loosened between a pair of gear rolls. Each gear roll has a diameter of 84 m and has 40 triangular teeth on its circumference, and the tips of the triangular teeth are finished to have a rounded radius of curvature of 1n. The gear rolls are engaged with each other to a certain depth, and the degree of kneading is changed depending on the depth K of this anastomosis. The depth of engagement was varied from 0 fins (no engagement) to 1.5 fins. When the mesh is deep (the more the threads are massaged and loosened, the more
It becomes easier to open the fibers during stretching at temperatures above ℃.

揉みほぐし後、乾燥された糸条を温度３６０℃、長さ２
ｍの熱板上で２倍に延伸し、最後に温度５００℃、長さ
３ｍの熱板上で４倍に延伸した。（したがって、全延伸
倍率は１０．４倍である。） かくして延伸された糸免に仕上オイルを付与して４００
ｍ／Ｊｌｆ’ｌで巻き取った。得られた糸条の繊度は１
５５０デニールであった。After kneading and loosening, the dried yarn is heated to 360°C and has a length of 2
The film was stretched twice on a hot plate with a length of 3 m and then stretched 4 times on a hot plate with a length of 3 m at a temperature of 500°C. (Therefore, the total stretching ratio is 10.4 times.) Finishing oil was applied to the thus-stretched yarn, and 400%
It was wound up with m/Jlf'l. The fineness of the obtained yarn is 1
It was 550 denier.

この延伸に於いて、５００℃の熱板に入る延伸直前の糸
条の幅と熱板を出た延伸直後の糸条の幅を６１１１定し
、糸質１品位、工程番・４子と併せてそＱ−・ん果を表
３に示す。In this drawing, the width of the yarn just before it enters the hot plate at 500°C and the width of the yarn just after it leaves the hot plate are determined as 6111, and the yarn quality is 1, the process number is 4, and Table 3 shows the fruit of TesoQ-.

表　　　　　　３ 表３から明らかなようにギヤールールの噛合の深さが０
．３訂以下では開繊が不十分で、融着防止が改善されて
おらず、強度は低目で、断糸率も高くなっている（実験
Ｎａ　ｓ　＋　６　）。実験？紅？、８．９ではギヤー
ロールの噛合の深さが０．６〜１．０鰭迄変化している
が、高温延伸下での糸条の開繊が本発明で特定した範囲
にあり、融着は殆んどなく、強度も高く、断糸率も著し
く低くなっている。又、毛羽の数も少い。Table 3 As is clear from Table 3, the meshing depth of the gear rule is 0.
．． In the third edition and below, the fiber opening is insufficient, the prevention of fusion is not improved, the strength is low, and the yarn breakage rate is high (experiment Na s + 6). experiment? deep red? , 8.9, the depth of engagement of the gear rolls varies from 0.6 to 1.0 fins, but the opening of the yarn under high temperature drawing is within the range specified in the present invention, and the fusion There is almost no breakage, the strength is high, and the thread breakage rate is extremely low. Also, the number of fuzz is small.

しかし、ギヤーロールの噛合が１．５１迄深くなると開
繊が大き過ぎ【、かえって単繊維が断糸し易く、そのた
めに断糸率が若干高くなると共に巻き取られた繊維の毛
羽が増加して好まし−ＮＨ−’＜ラー０→ｇジーＮＨ−
２５モル％により構成されるＩ　Ｖ　＝　４．０の芳香
族コポリ７ミドを塩化カルシウム（ＣａＣ／、）を含有
するＮＭＰ中に６７３．９２９６　＠解せしめた溶液を
、孔径０．３關、孔数２５０の紡糸口金から９３１／分
の吐出速度で押出した１、空気中を約１０絹走行させた
後、５０℃のＮＭＰ／水（３０／７０重量９６）の凝固
浴中で凝固させ１５ｍ／分の速度で引き上げ、引き続き
５０℃の水浴で洗浄し。However, when the meshing of the gear rolls becomes as deep as 1.51, the fiber opening becomes too large, and the single fibers are more likely to break, resulting in a slightly higher yarn breakage rate and an increase in the fuzz of the wound fibers. Preferably -NH-'<ra 0 → g g NH-
A solution of aromatic copoly7mide with IV = 4.0 composed of 25 mol % of 673.9296 @ dissolved in NMP containing calcium chloride (CaC/) was prepared using a pore size of 0.3 The silk was extruded from several 250 spinnerets at a discharge rate of 931/min, and after running in the air for about 10 minutes, it was coagulated in a coagulation bath of NMP/water (30/70 weight 96) at 50°C for 15 m/min. The sample was lifted at a speed of 1 minute and then washed in a 50°C water bath.

表２に示される不活性な無機微粉末を水に分散させた分
散浴に１秒浸漬して引き上げ、ゴムローラーと金１ｆ４
　ｒＪ−ラーとの間で絞りをかけて後、乾燥した。Dip the inert inorganic fine powder shown in Table 2 in a dispersion bath in water for 1 second and pull it out.
After squeezing with rJ-Ra, it was dried.

次いで、直径３０１．長さ１ｍのスリット状中空バイブ
にて１２倍に延伸した。但し、この揚台スチームの雰囲
気温度は４６０℃であり。Next, the diameter is 301. It was stretched 12 times using a slit-shaped hollow vibrator having a length of 1 m. However, the atmospheric temperature of this lifting platform steam is 460°C.

糸条の温度は約４３０℃であった。The temperature of the yarn was approximately 430°C.

この延伸に於いて、延伸された糸条が中空パイプを出た
後、約３０α走行した時点で回転ローラーに摺接ぜしめ
て帯電防止剤を付与した。In this drawing, after the drawn yarn exited the hollow pipe and traveled approximately 30α, it was brought into sliding contact with a rotating roller and an antistatic agent was applied thereto.

この回転ローラーは通常オイルを伺与するのに使用さる
オイリングローラ−と同じものである。This rotating roller is the same as the oiling roller normally used for applying oil.

糸条は帯電防止剤を付与された後、コデントローラーを
介して巻き取った。帯電防止剤はモノソデイウムジオク
チルスルホサクシネートの２九水浴液を用いた。回転ロ
ーラーの回転数を上げると帯電防止剤り付着量が増加し
、延伸直後の糸条の幅を収束させようとする力が働く。After the yarn was coated with an antistatic agent, it was wound up using a codent roller. As the antistatic agent, a 29 water bath solution of monosodium dioctyl sulfosuccinate was used. When the rotation speed of the rotating roller is increased, the amount of antistatic agent deposited increases, and a force acts to converge the width of the yarn immediately after drawing.

このような実験を行った結果を表４に示す。Table 4 shows the results of such experiments.

表　　　４ 本実験ではスチームによる非接触延伸を行つたために、
糸条は著しく開はし易い。したがってｍｌ記延伸助剤を
付与すると単に延伸するだけで著しく開繊し、帯電防止
剤を使用しない実駄陽１１では余栄響開繊しすぎて、ボ
ビン端面の毛羽が多く断糸阜も若干高い。適当に帯に防
止剤を付与すると開繊の状態が適度に調整されて実験４
１２　、１３１Ｃ示す如く繊維の品質１品位！工程調子
共に満足された状態で製糸される。Table 4 In this experiment, non-contact stretching was performed using steam, so
The yarn is extremely easy to open. Therefore, when the ml drawing aid is applied, the fibers are opened significantly just by drawing, and in Jidayo 11, which does not use an antistatic agent, the fibers are opened too much, and there is a lot of fuzz on the bobbin end face, and there are also some broken threads. expensive. When an appropriate inhibitor was applied to the band, the opening state was adjusted appropriately and experiment 4
12. As shown in 131C, the quality of the fiber is 1 grade! The yarn is spun with satisfactory process conditions.

しかし、過度に帯電防止剤を付与すると実験翫１４の如
く、開繊が全く消失し、その結果として融着が発生する
。However, if an excessive amount of antistatic agent is applied, as shown in Experiment 14, fiber opening completely disappears, and as a result, fusion occurs.

Claims (11)

【特許請求の範囲】[Claims] （１）ポリマー繰返し単位の８０モル％以上が下記繰返
し単位 −ＮＨ−Ａｒ＿１−ＮＨＣＯ−Ａｒ＿２−ＣＯ− 〔ここで、Ａｒ、Ａｒ＿２は、▲数式、化学式、表等が
あります▼、▲数式、化学式、表等があります▼及び▲
数式、化学式、表等があります▼から選ばれた少くとも
１種の芳香族残基を示す。これらの芳香族残基は、その
水素原子の一部又は全部がハロゲン原子又は低級アルキ
ル基で置換されていてもよい。〕 で構成される芳香族ポリアミドの糸条を、最高延伸温度
４００℃以上にて、６倍以上の全延伸倍率に、１段又は
２段以上で延伸して高強力高モジユラスの芳香族ポリア
ミド繊維を製造する方法において、４００℃以上の温度
で延伸を行う際に、延伸される糸条を扁平状に拡げ、か
つ延伸直前の糸条の幅に対する延伸直後の糸条の幅が１
．１〜１０になるように開繊して延伸することを特徴と
する芳香族ポリアミド繊維の製造方法。(1) 80 mol% or more of the polymer repeating units are the following repeating units -NH-Ar_1-NHCO-Ar_2-CO- [Here, Ar and Ar_2 are ▲mathematical formulas, chemical formulas, tables, etc.▼, ▲mathematical formulas, chemical formulas There are tables, etc. ▼ and ▲
There are mathematical formulas, chemical formulas, tables, etc. Indicates at least one type of aromatic residue selected from ▼. Some or all of the hydrogen atoms in these aromatic residues may be substituted with a halogen atom or a lower alkyl group. ] The aromatic polyamide yarn composed of is stretched in one or two or more stages at a maximum stretching temperature of 400°C or higher and a total stretching ratio of 6 times or more to produce a high-strength, high-modulus aromatic polyamide fiber. In the method for producing , when drawing is carried out at a temperature of 400°C or higher, the thread to be drawn is expanded into a flat shape, and the width of the thread immediately after drawing is 1 compared to the width of the thread immediately before drawing.
．． 1. A method for producing aromatic polyamide fibers, which comprises opening and drawing the fibers to a fiber size of 1 to 10. （２）Ａｒ＿１、Ａｒ＿２の合計の８０モル％以上が、
下記芳香族残基（Ａ）及び（Ｂ）▲数式、化学式、表等
があります▼（Ａ） ▲数式、化学式、表等があります▼（Ｂ） 〔ここで、芳香族残基（Ａ）、（Ｂ）は、その水素原子
の全部又は一部がハロゲン原子及び／又は低級アルキル
基で置換されていてもよい。〕であり、かつ芳香族残基
（Ｂ）の比率が１０〜４０モル％である特許請求の範囲
第（１）項記載の芳香族ポリアミド繊維の製造方法。(2) 80 mol% or more of the total of Ar_1 and Ar_2 is
The following aromatic residues (A) and (B) ▲ There are mathematical formulas, chemical formulas, tables, etc. ▼ (A) ▲ There are mathematical formulas, chemical formulas, tables, etc. ▼ (B) [Here, aromatic residues (A), In (B), all or part of the hydrogen atoms may be substituted with a halogen atom and/or a lower alkyl group. ] and the ratio of the aromatic residue (B) is 10 to 40 mol %, the method for producing an aromatic polyamide fiber according to claim (1). （３）Ａｒ＿１、Ａｒ＿２の合計の８０モル％以上が、
下記芳香族残基（Ａ）及び（Ｂ′） ▲数式、化学式、表等があります▼（Ａ） ▲数式、化学式、表等があります▼（Ｂ′） 〔ここで、芳香族残基（Ａ）、（Ｂ′）は、その水素原
子の全部又は一部がハロゲン原子及び／又は低級アルキ
ル基で置換されていてもよい。〕 であり、かつ構成単位（Ｂ′）の比率が１０〜４０モル
％である特許請求の範囲第（１）項記載の芳香族ポリア
ミド繊維の製造方法。(3) 80 mol% or more of the total of Ar_1 and Ar_2 is
The following aromatic residues (A) and (B') ▲There are mathematical formulas, chemical formulas, tables, etc.▼(A) ▲There are mathematical formulas, chemical formulas, tables, etc.▼(B') [Here, aromatic residues (A) ), (B') may have all or part of their hydrogen atoms substituted with a halogen atom and/or a lower alkyl group. ] The method for producing an aromatic polyamide fiber according to claim (1), wherein the proportion of the structural unit (B') is 10 to 40 mol%. （４）４００℃以上の延伸を熱板上で行う特許請求の範
囲第（１）項記載の芳香族ポリアミド繊維の製造方法。(4) The method for producing aromatic polyamide fibers according to claim (1), wherein the stretching is carried out at 400° C. or higher on a hot plate. （５）４００℃以上の延伸を気体浴中で行う特許請求の
範囲第（１）項記載の芳香族ポリアミド繊維の製造方法
。(5) The method for producing aromatic polyamide fibers according to claim (1), wherein the stretching is carried out at 400°C or higher in a gas bath. （６）糸条を水浴中で１．０５〜２倍に予備延伸した後
、乾燥し、次いで４００℃以上の温度で延伸を行う特許
請求の範囲第（１）項記載の芳香族ポリアミド繊維の製
造方法。(6) The aromatic polyamide fiber according to claim (1), wherein the yarn is pre-stretched to 1.05 to 2 times in a water bath, dried, and then stretched at a temperature of 400°C or higher. Production method. （７）糸条を水浴中で１．０５〜２倍に第１次予備延伸
した後、乾燥し、次いで４００℃未満の温度で１．５〜
３倍に第２次予備延伸し、しかる後４００℃以上の温度
で延伸を行う特許請求の範囲第（１）項記載の芳香族ポ
リアミド繊維の製造方法。(7) After the yarn is first pre-stretched to 1.05 to 2 times in a water bath, it is dried and then 1.5 to 2 times at a temperature below 400°C.
The method for producing aromatic polyamide fibers according to claim (1), which comprises performing a second preliminary stretching to a factor of 3 and then stretching at a temperature of 400° C. or higher. （８）糸条が１００本以上の単繊維から構成される特許
請求の範囲第（１）項記載の芳香族ポリアミド繊維の製
造方法。(8) A method for producing an aromatic polyamide fiber according to claim (1), wherein the yarn is composed of 100 or more single fibers. （９）糸条に延伸助剤を付着させた後、４００℃以上の
温度で延伸する特許請求の範囲第（１）項記載の芳香族
ポリアミド繊維の製造方法。(9) The method for producing aromatic polyamide fibers according to claim (1), wherein the yarn is stretched at a temperature of 400° C. or higher after adhering a stretching aid to the yarn. （１０）糸条に機械的なもみほぐし作用を与えた後、４
００℃以上の温度で延伸する特許請求の範囲第（１）項
記載の芳香族ポリアミド繊維の製造方法。(10) After applying mechanical kneading action to the yarn, 4
A method for producing an aromatic polyamide fiber according to claim (1), wherein the fiber is stretched at a temperature of 00°C or higher. （１１）延伸直前の糸条の幅に対する延伸直後の糸条の
幅が１．５〜５となるように開繊する特許請求の範囲第
（１）項記載の芳香族ポリアミド繊維の製造方法。(11) The method for producing aromatic polyamide fibers according to claim (1), in which the fibers are opened so that the width of the yarn immediately after stretching is 1.5 to 5% compared to the width of the yarn immediately before stretching.