JPS59157310A - Synthetic yarn having thickness and thinness and its preparation - Google Patents

Abstract

PURPOSE:To obtain synthetic yarn having change in birefringence of constant or random period in fiber axis direction and simultaneously thickness and thinness, by irradiating the thermoplastic synthetic yarn with laser beam. CONSTITUTION:Orientated thermoplastic synthetic yarn consisting of thermoplastic high polymer such as polyester, polyamide, etc. is irradiated with laser beam of carbon monoxide laser, etc. under tension, to give the desired synthetic yarn having >=0.005 change in birefringence in the fiber axis direction intermittently, thickness and thinness of >=10% ratio of change in crosssectional area in the fiber axis direction, and birefringence higher in the thick part than in the thin part.

Description

【発明の詳細な説明】 本発明は繊維軸方向に、一定周期又はランダム周期の複
屈折率変化を有すると同時に太細を有する合成繊維及び
その製造方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a synthetic fiber that has a birefringence change with a fixed period or a random period in the fiber axis direction, and also has a thick and thin structure, and a method for producing the same.

従来、太細を有する合成繊維を製造する方法が数多く提
案されている。例えばポリエステル繊維で繊維軸方向に
染め差を付与する方法として周期′Ｉ″ｆｆ。Conventionally, many methods for producing synthetic fibers having thick and thin structures have been proposed. For example, as a method of imparting a dye difference in the axial direction of polyester fibers, the period 'I''ff is used.

的な延伸併が生ずるような延伸条件を設定するこ１８２
８４４号公報、特公昭４１−６６１５号公報、特開昭５
０−１８７１＠公報、特開昭５０−１．８７１７号公報
、特開昭５０−１８７１８号公報、特開昭５０−８５４
２２号公報）とか、熱嶽 処理を利用して周期排を作る方法として、ピン。182 Setting the stretching conditions such that stretching complication occurs
Publication No. 844, Japanese Patent Publication No. 41-6615, Japanese Patent Application Publication No. 1977
0-1871@publication, JP-A-50-1.8717, JP-A-50-18718, JP-A-50-854
(No. 22), as a method of making periodic ejectors using heat treatment.

ローラ、熱板を使う方法（例えば特開昭５０−１２８１
６号公報）などが提案されているが、いずれの方法も糸
条への斑付与、特に細かい周期の斑付与のコントロール
が困難で安定した操業ができないという欠点があった。A method using a roller or hot plate (for example, JP-A-50-1281)
6), but all of these methods have the disadvantage that it is difficult to control the imparting of unevenness to the yarn, particularly the unevenness of fine cycles, and stable operation cannot be performed.

本発明者らは、これらの問題点を解決するために、鋭意
検討を重ねた結果、配向しだ熱可塑性合成繊維に緊張下
で赤外線域のレーザ光を照射すると複屈折率Δｎが低下
せしめられると同時に太細班 耕を生起させることを知見し、該知見に基づいて糸条に
太細斑を生じさせると同時に染色斑を任意の周期で付与
する方法を確立し、本発明に到達した。In order to solve these problems, the present inventors have conducted intensive studies and found that when oriented thermoplastic synthetic fibers are irradiated with laser light in the infrared region under tension, the birefringence Δn is reduced. At the same time, it was discovered that thick and thin spots can be produced, and based on this knowledge, a method was established for producing thick and thin spots on the yarn and at the same time imparting dyeing spots at an arbitrary period, thereby achieving the present invention.

即ち、本発明は次の２発明よりなるものである。That is, the present invention consists of the following two inventions.

（１）熱可塑性高分子よシ成り、繊維軸方向に断続的に
０．００５以上の複屈折率（Δｎ）変化を有し、かつ、
繊維軸方向の横断面積の変化率が１０％以上の太細を有
する合成繊維であって、太い部分の複屈折率が細い部分
の複屈折率よシ大きいことを特徴とする太細を有する合
成繊維。(1) It is made of a thermoplastic polymer and has an intermittent change in birefringence (Δn) of 0.005 or more in the fiber axis direction, and
A synthetic fiber having thick and thin parts with a rate of change in cross-sectional area in the fiber axis direction of 10% or more, the synthetic fiber having thick and thin parts characterized in that the birefringence of the thick part is greater than the birefringence of the thin part. fiber.

（２）配向した熱可塑性合成繊維に緊張下でレーザ光を
間欠的に照射することを特徴とする繊維軸方向に複屈折
率変化を有すると同時に太細を有する合成繊維の製造方
法。(2) A method for producing a synthetic fiber that has a birefringence change in the fiber axis direction and is thick and thin, the method comprising intermittently irradiating an oriented thermoplastic synthetic fiber with a laser beam under tension.

本発明にいう熱可塑性高分子とは、繊維形成性の熱可塑
性高分子であり、例えばポリエステル、ポリアミド、ポ
リプロピレン、ポリ塩化ビニール、ポリアクリロニトリ
ル等がその代表的なものであり、特にポリエステル及び
ポリアミドの場合、本発明の効果が顕著である。The thermoplastic polymer referred to in the present invention is a fiber-forming thermoplastic polymer, and typical examples thereof include polyester, polyamide, polypropylene, polyvinyl chloride, polyacrylonitrile, etc., and in particular polyester and polyamide. In this case, the effect of the present invention is remarkable.

本発明の繊維は、繊維軸方向に任意の周期で複屈折率（
Δｎと略記する）の高い部分と低い部分を有し、かかる
Δｎ変化、すなわち高い部分と低い部分との差（測定法
は後記）か０．００５１Ｊ、上存在するものである。Δ
ｎｑ化が０．００５未満の場合は、Δｎの高い部分と低
い部分の染色性に差を生じなくなり、濃淡差効果を有効
に生かすことか出来ない。The fiber of the present invention has a birefringence index (
It has a high part and a low part of Δn (abbreviated as Δn), and the difference in Δn, that is, the difference between the high part and the low part (the measurement method will be described later), is greater than 0.0051 J. Δ
If the nq value is less than 0.005, there will be no difference in dyeability between areas with high and low Δn, and the effect of the difference in density cannot be effectively utilized.

Δｎ変化を帆００５以上とすることにより、染色性の差
が顕著となるので、染色濃淡差効果を有効に生かすこと
ができる。史に、濃淡差を強稠するにはΔｎ変化を０．
０２以、上とするのが好ましい。By setting the Δn change to 005 or more, the difference in dyeing properties becomes significant, so the effect of the difference in dyeing density can be effectively utilized. Historically, to intensify the difference in shading, the Δn change should be 0.
02 or higher is preferable.

本発明の繊維は繊維軸方向の横断面積の変化率が１０％
以上の一定周期又はランダム周期の任意の太細斑を有す
る。ここで本発明の繊維について特筆すべきは、レーザ
光を照射せしめた部分のΔｎは、未照射部分のΔｎに比
して常に小さい値をとることである。さらｌここの場合
、Δｎの大きい部分が太い部分に該当し、Δｎの小さい
部分が細い部分で構成されている。The fiber of the present invention has a cross-sectional area change rate of 10% in the fiber axis direction.
It has arbitrary thick and thin spots with a constant period or a random period. What should be noted here about the fiber of the present invention is that Δn in the portion irradiated with laser light always takes a smaller value than Δn in the non-irradiated portion. In this case, the portion where Δn is large corresponds to the thick portion, and the portion where Δn is small corresponds to the thin portion.

なお、繊維軸方向の横１１１ｉ而稍の変化率が１０％未
満になると、糸条の太細斑が実１３ｒ的になくなり、本
発明の繊維が得られない。If the rate of change in the lateral direction 111i in the fiber axis direction is less than 10%, the unevenness of the threads will actually disappear and the fiber of the present invention cannot be obtained.

本発明のｍ　維は、一定Δｎ域の長さをバラツキなくし
て任意に設定することができる。例えば高Δｎの部分の
長さか５咽、低Δｎの部分の長さが５咽の周期にするこ
とかできるし、高Δｎの部分の長さが１０（１）で低Δ
ｎの部分の長さを５ｗｎの周期とすることもできる。The m fiber of the present invention can be arbitrarily set without variation in the length of the constant Δn region. For example, the length of the high Δn part can be set to 5 cycles, and the length of the low Δn part can be set to 5 cycles, or the length of the high Δn part can be 10(1) and the length of the low Δn part is 5 cycles.
The length of the n portion can also be set to a period of 5wn.

従来長さのバラツキなく長さ５嘱のような短い周期でΔ
ｎ及び繊維の横断面積を変化させることは困帷であった
が、緊張下の配向した熱可解性合成繊維に、レーザ光を
間欠的に照射する本発明方法により、このような短い周
期成は適宜の長い周期で長さのバラツキなく任意に太細
及びΔｎ変化を付与することができる。Conventionally, ∆ with short cycles such as 5 lengths without any variation in length.
Although it was difficult to change the cross-sectional area of the fiber and the cross-sectional area of the fiber, the method of the present invention, in which laser light is intermittently irradiated on the oriented thermoplastic synthetic fiber under tension, has made it possible to produce such a short cycle. It is possible to arbitrarily apply thick/thin and Δn changes at an appropriately long period without any variation in length.

ここで言う、配向した熱可塑性合成繊維とは、レーザ光
照射により高Δｎ部分と低Δｎ部分との差を０．００５
以−トとなし得るようなものであれば如何ｔＣるもので
もよい。従ってレーザ光照射によりΔｎをＯ（正確には
帆０００）まで低下させ得る熱可塑性合成繊維の場合に
は、Δｎが０　、００５以上であるような合成繊維も本
発明にいう配向した熱可塑性合成繊維ということができ
る。しかしながら配向度があまり低すぎて未延伸糸に近
いものは、経時的脆化が起こり、繊維としての実用性に
欠けるので、かかる経時的脆化が実質的に実用上問題と
ならない程度のΔｎを保有しているものが好ましい。The oriented thermoplastic synthetic fiber referred to here means that the difference between the high Δn part and the low Δn part is 0.005 by laser light irradiation.
Any type of material that can be used as described above may be used. Therefore, in the case of thermoplastic synthetic fibers whose Δn can be reduced to O (to be precise, 000) by laser beam irradiation, synthetic fibers whose Δn is 0.005 or more are also oriented thermoplastic synthetic fibers according to the present invention. It can be called fiber. However, if the degree of orientation is too low and it is close to undrawn yarn, it becomes brittle over time and is not practical as a fiber. Preferably what you have.

配向した熱可塑性合成繊維にレーザ光を照射すると、そ
の照射強度に応じてΔｎが低下し、がっ、その部分の密
度も低下する。このことは、繊維構成成分がレーザ光を
吸収して、一種の融解に近い状態になるものと推測され
る。When oriented thermoplastic synthetic fibers are irradiated with laser light, Δn decreases depending on the irradiation intensity, and the density of that portion also decreases. This is presumed to be due to the fact that the fiber components absorb the laser light and enter a state close to melting.

上記現象を生起させるには、赤外域波長のレーザ光が有
効で例えば−酸化炭素レーザ（波長５〜７μｍ）、炭酸
ガスレーザ（波長１０．６μｍ）などか使用できる。In order to cause the above phenomenon, a laser beam having a wavelength in the infrared region is effective, and for example, a carbon oxide laser (wavelength: 5 to 7 μm) or a carbon dioxide laser (wavelength: 10.6 μm) can be used.

レーザには発振形式がパルスのものと連続波のものがあ
り、本発明にはいずれの形式も適用できるが、特にパル
ス発振形式が適する。太細及びΔｎ差の周期は、レーザ
光をパルス化して照射時間を変更すること及び照射され
る糸条の張力を変更することによって任意に選ぶことが
できる。There are two types of laser oscillation: pulse oscillation type and continuous wave oscillation type. Although either type can be applied to the present invention, the pulse oscillation type is particularly suitable. The period of the thick/thin and Δn difference can be arbitrarily selected by pulsing the laser light and changing the irradiation time and by changing the tension of the irradiated yarn.

この場合、レーザ光照射位置を固定する方法はもちろん
レーザ光照射位置を移動することもできる。In this case, it is possible not only to fix the laser beam irradiation position but also to move the laser beam irradiation position.

市販の加工用炭酸ガスレーザではパルス周期０、Ｉ　Ｘ
　１０−’　〜１００　Ｘ　１０−８秒でスポット径０
．５　ｍ程度のものが使用できる。レーザ光のビームモ
ードはシングルモードでよいか、特別に斑をランダマイ
ズするには各種モードを使用することができる。Commercially available carbon dioxide lasers for processing have a pulse period of 0, I
10-' ~100 x 10-8 seconds, spot diameter 0
．． Approximately 5 m long can be used. The beam mode of the laser light may be a single mode, or various modes may be used to specifically randomize spots.

＋１８射するレーザ光のパワー密質を変えることによっ
てΔｎの高い部分と低い部分の差を変えることかできる
。すなわち、パワー密度を而くすると、照射を受けた部
分のΔｎの低下は大きくなり、従ってΔｎ差を大きくす
ることができる。レーザ光の出力を弯史するか又は、レ
ーザ光の焦点からの照射位置法めによって、パワー密度
を変えることが可能である。この時パワー密度を画＜シ
過ぎると繊維か溶断する場合かあるので注意を要する。+18 By changing the power density of the emitted laser beam, the difference between the high and low parts of Δn can be changed. That is, when the power density is decreased, the decrease in Δn of the irradiated portion increases, and therefore the Δn difference can be increased. It is possible to change the power density by adjusting the output of the laser beam or by adjusting the irradiation position from the focal point of the laser beam. At this time, care must be taken because if the power density is set too high, the fibers may melt and break.

所望のΔΩ差に応じて、適切なパワー密度を設定するこ
とが必要である。It is necessary to set an appropriate power density depending on the desired ΔΩ difference.

本発明の方法において太細斑を生起させるためには、レ
ーザ光の照射された部分で繊維の延伸が起こる程度の強
度でレーザ光を照射することが必映である。この場合糸
条の張力は重要で、レーザ光の照射部分を延伸して糸条
に太細斑を生起させるには、糸張力は通常約０．５　ｆ
／ｄ以上、好ましくは０．８　ｒ／ｄ以上に保つのが良
い。In order to produce thick and thin spots in the method of the present invention, it is necessary to irradiate the laser beam with such intensity that stretching of the fiber occurs in the area irradiated with the laser beam. In this case, the tension of the yarn is important, and in order to stretch the irradiated part of the laser beam and create thick and thin spots on the yarn, the yarn tension is usually about 0.5 f.
/d or more, preferably 0.8 r/d or more.

レーザ光照射による太細及びΔｎ差の付与は、通常の熱
可塑性合成繊維の製糸工程において、延伸後引き続いて
巻取りまでの間で配向した熱可塑性合成繊維に緊張下で
レーザ光を断続的に照射することで、所望の太細及びΔ
ｎ差を付与することが可能であって、設備的に大がかり
なものとなったり、工程的に煩雑化することがないと言
った利点を有する。The provision of thick/thin and Δn differences by laser beam irradiation is achieved by intermittently applying a laser beam under tension to oriented thermoplastic synthetic fibers after drawing and subsequently until winding in the normal spinning process of thermoplastic synthetic fibers. By irradiating, the desired thickness and Δ
This method has the advantage that it is possible to provide a difference in n and does not require large-scale equipment or complicated processes.

太細及びΔΩ差の付与は、上記方法に・限る・も・の・
ではなく例えば、高速紡糸によって得られる前配向未延
伸糸（所謂ＰＯＹ　）製造工程において、紡糸後捲取り
までの間で、又は−畦捲取った後、あるいは、トウ状に
収納後、糸条の張力条件及びレーザ光照射条件を選択す
・ることで所望の太細及びΔｎ差を付与することができ
る。Addition of thick/thin and ΔΩ differences is limited to the above methods.
Rather, for example, in the production process of pre-oriented undrawn yarn (so-called POY) obtained by high-speed spinning, the yarn is By selecting tension conditions and laser beam irradiation conditions, desired thickness and Δn difference can be imparted.

このように本発明によれば、自然な外観で糸条に太細差
を有する糸が容易に製造され、得られた糸の染色物は深
みのある自然な色調差を有し、加えてその製編織物は、
優れた抗ビル性、抗スナツグ性を有するといった効果を
も奏する。As described above, according to the present invention, a yarn with a natural appearance and a difference in thread thickness can be easily produced, and the dyed product of the obtained yarn has a deep and natural color tone difference, and in addition, The knitted fabric is
It also has excellent anti-build and anti-snag properties.

次に本発明におけるΔｎの測定方法、Δｎ変化率の測定
方法、Δｎ同一部の長さの測定方法及び染色物の濃淡差
の判定方法について述べる。Next, a method of measuring Δn, a method of measuring the rate of change of Δn, a method of measuring the length of the same part of Δn, and a method of determining the difference in shade of a dyed product will be described.

Δｎの測定方法： 高分子実験学構座（４）；共立出版株式会社、昭和３４
年１１月１５日発行、高分子の物性■第７７〜１１０頁
に記載される方法により測定する。Measuring method of Δn: Polymer Experimental Science Structure (4); Kyoritsu Publishing Co., Ltd., 1952
It is measured by the method described in Physical Properties of Polymers, pages 77 to 110, published on November 15, 2015.

Δｎ同一部の長さの測定方法； Δｎの測定方法と同様に、偏光顕微鏡を用いて、縞パタ
ーンが変化しない長さを、試料台を操作させて測定する
。Method for measuring the length of the same portion of Δn: In the same way as the method for measuring Δn, the length at which the stripe pattern does not change is measured using a polarizing microscope by operating the sample stage.

Δｎ変化率の測定方法； まず単糸試料の連続するΔｎ同一部長さを一ト記Δｎ測
定方法に従って次゛の要領で測定する。即ち、Δｎ同一
部の連続長さが１０ｃｒｎ以下（高Δｎ部分及び低Δｎ
部分のいずれもが１０ｃｎＩ以下）の場合においては、
単糸試料約１２１：Ｔ＋＋（１２１Ｍより短いステープ
ルの場合はステーブルの任意単糸とする）を３本（旧〜
旧）ランダムにサンプリングして各々について５餌毎に
Δｎ値を上記Δｎ測定方法により２０点求める。Method for measuring the rate of change in Δn: First, the length of a single continuous Δn portion of a single yarn sample is measured in the following manner according to the Δn measuring method described above. That is, the continuous length of the same part of Δn is 10 crn or less (high Δn part and low Δn part)
(all of the parts are less than 10cnI),
Single yarn sample approximately 121: 3 pieces of T++ (for staples shorter than 121M, select any single yarn from the stable) (old ~
Old) Randomly sample and obtain 20 Δn values for each 5 baits using the Δn measuring method described above.

Δｎ同一部の連続長さが１０Ｃｒｎを超える場合（高Δ
ｎ部分又は低Δｎ部分のいずれかが１０ｃＩｎを超える
場合）は、Δｎの変化部分を含む様に単糸試料約１２ｃ
ｒｎを３本（ｎ＋、−ｎｓ）う７ダムニサンフリングし
て各々について５醜毎にΔｎ値を上記方法により２０点
求める。次に各試料の２０点のΔｎ値の最大値（Δ旧ｍ
ａｘ、Δｎｔｍａｘ、Δｎ　ｓｍａｘ　）　、及び最小
値（ΔＨ＋ｍｉｎ、Δｎｔｍｉｎ、Δｒ＋＋＋ｍｉｎ　
）　ヲ求め下記の式よりΔｎ変化率を求める。When the continuous length of the same part of Δn exceeds 10 Crn (high Δ
If either the n portion or the low Δn portion exceeds 10 cIn), the single yarn sample should be approximately 12 cIn to include the portion where the Δn changes.
Three rn lines (n+, -ns) are subjected to 7 dummiesanflings, and 20 Δn values are obtained for each 5 ugliness using the above method. Next, the maximum value of Δn values of 20 points of each sample (Δold m
ax, Δntmax, Δn smax ), and the minimum value (ΔH+min, Δntmin, Δr+++min
) Find the rate of change of Δn using the formula below.

Δｎ変化率＝　Δｎｍａ　ｘ−Δｎｍ１ｎ尚、高Δｎ部
分及び低Δｎ部分の長さが共に５園の場合、Δｎ変化率
が０．００５未満においては再度単糸試料を３本ランダ
ムにサンプリングをして上記測定を繰り返す。Δn change rate = Δnmax - Δnm1nIf the lengths of both the high Δn part and the low Δn part are 5, if the Δn change rate is less than 0.005, sample three single yarn samples at random again. Repeat the above measurements.

ここで上記を５回くり返し測定してもΔｎ変化率が０．
００５未満の場合においてはその測定値の平均値とする
。Here, even if the above procedure is repeated five times, the rate of change in Δn is 0.
If the value is less than 0.005, the average value of the measured values is used.

染色物の濃淡差の判定方法： デイスバーゾルファーストスヵーレッ）Ｂ（ＩＣ１社製
分散染料）４．０％ｏｗｆ　、ディスパーＴＬ　（明星
化学工業社製分散剤）　１　ｆ／Ｌ、浴比１　：　１０
０　。Method for determining the difference in shade of a dyed product: Dispersor Fast Scarlet B (disperse dye manufactured by IC1) 4.0% owf, Disper TL (dispersant manufactured by Myojo Chemical Industry Co., Ltd.) 1 f/L, bath ratio 1 : 10
0.

常圧沸騰温度（９８℃）で試料を９０分間染色した簡鴫
地を１０人の官能評価により濃淡差穴（３点）。The sample was dyed at normal pressure and boiling temperature (98℃) for 90 minutes and was evaluated by 10 people for the difference in density (3 points).

中（２点）、小（１点）、なしく０点）の４ランク法で
評価し、２５点以上（◎）、１５〜２４点（○）、１０
〜１４点（△）、１ｏ点未満（×）でで示す。Evaluated using a 4-rank method: medium (2 points), small (1 point), and none (0 points): 25 points or more (◎), 15-24 points (○), 10
Indicated by ~14 points (△) and less than 10 points (x).

以下に本発明を実施例をあげて説明する。The present invention will be explained below by giving examples.

実施例 極限粘度０．６　（フェノール／テトラクロルエタン６
／４の混合溶媒中３０℃で測定）の５０デニール、２４
フイラメントのポリエチレンテレフタレート延伸糸（Δ
ｎ　０．１７５の円形断面糸）を走行速度１５０ｙｎ／
分にて走行させ、その走行糸条にレーザ光を照射せしめ
た。得られた繊維を常法によりニット（インターロック
）にして、精練、染色後ＩＣＩ法による抗スナツグ性及
び染色物の濃淡差を評価した。得られた糸条の特性、レ
ーザ光照射条件及び染色物の濃淡差の評価結果を、レー
ザ光未照射の場合（実験Ｎｏ、Ｃ）及び従来一般のシッ
ク・アンド・シンヤーン（実験ＮＯ，Ｄ）と共に第１表
に示した。Example Intrinsic viscosity 0.6 (phenol/tetrachloroethane 6
/4 mixed solvent at 30°C), 50 denier, 24
Filament polyethylene terephthalate drawn yarn (Δ
circular cross-section yarn of n 0.175) at a running speed of 150 yn/
The yarn was run for 20 minutes, and the running yarn was irradiated with laser light. The obtained fibers were made into a knit (interlock) by a conventional method, and after scouring and dyeing, the anti-snag property and the difference in shade of the dyed product were evaluated by ICI method. The obtained yarn characteristics, laser light irradiation conditions, and evaluation results of the difference in shade of the dyed product were evaluated for the case without laser light irradiation (experiment No., C) and the conventional general thick and thin yarn (experiment No. D). They are also shown in Table 1.

第１表中実験Ｎ［ｌ　Ｂは本発明の例であり、糸条は太
細差を有し、かつ高Δｎ部及び低Δｎ部の長さのバラツ
キがなく、染色物は深みのある自然な色調差を示した。Experiment N [l B in Table 1 is an example of the present invention, the yarn has a difference in thickness, there is no variation in length of the high Δn part and the low Δn part, and the dyed product has a deep natural texture. It showed a significant difference in color tone.

実験ＦＪｆｌ　ＡはΔｎ変化率が本発明の範囲をはずれ
るもので、しがも実質的に太細差を有せず、染色物の７
１１１淡差は殆んど認められない。実験ＮＱ、　Ｃはレ
ーザ光未照射の延伸糸で、染色物の濃淡差及び抗スナツ
グ性は全く認められない。実験Ｎ１１Ｄは、極限粘度ｏ
、６（フェノール／テトラクロルエタン６／４の混合溶
媒中３０　℃で測定）のポリエチレンテレフタレートを
２８５℃で溶融し、口金孔数３６の紡糸口金より３６９
／分の吐出量で吐出した糸条を捲取速度２０００　ｍ／
分で捲取って、得た未延伸糸を１００℃のホットプレー
トを用いて１．８倍に延伸して得た従来一般のシック・
アンド・シン・ヤーンを示し、その染色物の濃淡差効果
は良好であるが、太い部分のΔｎか細い部分のΔｎより
小さく、高Δｎ部及び低Δｎ部の長さのバラツキが極め
て大きく、さらに抗スナツグ性が著しく劣る。In experiment FJfl A, the Δn change rate was outside the range of the present invention, but there was virtually no difference in thickness, and 7
111. Almost no difference in lightness is observed. Experiments NQ and C were drawn yarns that were not irradiated with laser light, and no difference in shade or snag resistance was observed in the dyed product. Experiment N11D has an intrinsic viscosity o
, 6 (measured at 30 °C in a mixed solvent of phenol/tetrachloroethane 6/4) was melted at 285 °C, and 369
A winding speed of 2000 m/min is used to wind up the yarn discharged at a discharge rate of 2000 m/min.
The undrawn yarn obtained by winding the yarn in 10 minutes was stretched to 1.8 times using a hot plate at 100°C.
The shading effect of the dyed product is good, but the Δn of the thick part is smaller than the Δn of the thin part, and the length variation of the high Δn part and the low Δn part is extremely large. Snagging properties are significantly poor.

（以下余白） 第　　　　　　１　　　　　　夷 肴長さのバラツキ著しく０．１〜２０問　の範囲にバラ
ついている。(Left below) No. 1 There is a significant variation in the length of the dish, which varies from 0.1 to 20 questions.

特許出願人　東洋紡績株式会社Patent applicant: Toyobo Co., Ltd.

Claims (2)

【特許請求の範囲】[Claims] （１）熱可塑性高分子より成り、繊維軸方向に断続的に
０．００５以上の複屈折率（Δｎ）変化を有し、かつ、
繊維軸方向の横断面積の変化率が１０％以上の太細を有
する合成繊維であって、太い部分の複屈折率が細い部分
の複屈折率より大きいことを特徴とする太細を有する合
成繊維。(1) It is made of a thermoplastic polymer and has an intermittent change in birefringence (Δn) of 0.005 or more in the fiber axis direction, and
A synthetic fiber having thick and thin parts with a change rate of cross-sectional area in the fiber axis direction of 10% or more, the synthetic fiber having thick and thin parts characterized in that the birefringence of the thick part is larger than the birefringence of the thin part. . （２）配向した熱可塑性合成繊維に緊張下でレーザ光を
間欠的に照射することを特徴とする繊維軸方向に複屈折
率変化を有すると同時に太細を有する合成繊維の製造方
法。(2) A method for producing a synthetic fiber that has a birefringence change in the fiber axis direction and is thick and thin, the method comprising intermittently irradiating an oriented thermoplastic synthetic fiber with a laser beam under tension.