JP4236344B2 - Polyester thick multifilament yarn and method for producing the same - Google Patents

Polyester thick multifilament yarn and method for producing the same Download PDF

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JP4236344B2
JP4236344B2 JP23313299A JP23313299A JP4236344B2 JP 4236344 B2 JP4236344 B2 JP 4236344B2 JP 23313299 A JP23313299 A JP 23313299A JP 23313299 A JP23313299 A JP 23313299A JP 4236344 B2 JP4236344 B2 JP 4236344B2
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thick
yarn
multifilament yarn
polyester
appearance
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JP2001064823A (en
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能則 川島
秀夫 坂倉
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Mitsubishi Chemical Corp
Mitsubishi Rayon Co Ltd
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Mitsubishi Chemical Corp
Mitsubishi Rayon Co Ltd
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Description

【0001】
【発明の属する技術分野】
本発明は、衣料用途やインテリア用途等の布帛にしたときに、濃染部が鮮明でかつ短く、コントラストの強いカスリ調外観を呈する布帛を提供するポリエステル太細マルチフィラメント糸、及びその製造方法に関する。
【0002】
【従来の技術】
繊維そのものの濃淡染色化手段として従来から、複数の単繊維からなる未延伸糸を半延伸処理してなる太細マルチフィラメント糸があり、該太細マルチフィラメント糸による布帛には、濃染性の太部と淡染性の細部の濃淡の染色効果に起因する霜降り調の外観が得られることが知られている。しかしながら上記の太細マルチフィラメント糸は、淡染性を示す細部に濃染性を呈する単繊維の太部が混在しており、これを布帛にした時に該細部に通常の延伸糸と同等の淡色染色性が具備されておらず、十分なコントラストをなす濃淡の染色効果が表現され得ない。十分なコントラストを有する濃淡の染色効果を得るためには、マルチフィラメント糸を形成する各単繊維の太部及び細部が、それぞれマルチフィラメント糸の濃染部と淡染部とに集中して存在することが必要であり、例えば特開昭60−59145号公報には、高配向未延伸糸に間欠的に水付与しながら延伸・熱処理した後、さらに弛緩熱処理することによって太細マルチフィラメント糸を得る方法が記載されている。しかしながらこの方法では、糸条に対して水をランダムに間欠付与するための煩雑な管理が必要であり、しかも斑付与の周期が時間に支配されるため生産性を高めることが困難である。
【0003】
また、特開昭57−117645号公報には、直接紡糸延伸法で溶融紡出された糸条に流体噴出ノズルで交絡処理した後、Tg以下に予熱し延伸することで太細繊維を得る方法が記載されている。しかしこの方法では、紡糸引取ローラー前でのエアー交絡においては、糸条の張力が高くまた張力水準が変動し、20ヶ/mを越えるような交絡度の高い糸条を安定に得ることは難しく、太細マルチフィラメント糸を得ることはできるが、染色後の濃淡のコントラストが強い太細マルチフィラメント糸を得ることはできない。
【0004】
【発明が解決しようとする課題】
本発明はこのような従来技術における問題点を解決するものであり、染色後の濃染部と淡染部との周期がランダムであり、かつ濃染部と淡染部とのコントラストが大きなポリエステル太細マルチフィラメント糸であって、該太細マルチフィラメント糸により布帛を形成した時、淡染領域上に濃染部が短く明瞭に存在する外観を呈するポリエステル太細マルチフィラメント糸、及びその製造方法を提供することにある。
【0005】
【課題を解決するための手段】
本発明の要旨は、複屈折率が15×10−3〜40×10−3で、かつ300〜500kpaの流体処理により付与された交絡部を30〜80個/m具備する、複数の単繊維からなるポリエステル未延伸糸を一旦巻き取った後に、下記のa、b式を満足する条件下で加熱延伸することを特徴とするポリエステル太細マルチフィラメント糸の製造方法にある。
MDR×0.45≦延伸倍率≦MDR×0.60・・a
50℃≦延伸温度≦80℃・・b
(MDRは延伸温度85℃における未延伸糸の最大延伸倍率を表す。)
【0006】
【発明の実施の形態】
以下、本発明の好適な実施の形態について具体的に説明する。
本発明のポリエステル太細マルチフィラメント糸は、繊維軸方向に太細斑を有する複数の単繊維からなる。本発明では単繊維の最も細い部分に比べ2倍以上の繊度を有する部分を単繊維の太部とする。
【0007】
本発明では、ポリエステル太細マルチフィラメント糸の太部を構成する単繊維の70%以上が単繊維の太部からなり、該マルチフィラメント糸の細部を構成する単繊維の95%以上が単繊維の細部からなることが必要である。該マルチフィラメント糸の太部に、淡染色性を示す単繊維の細部が全フィラメント糸の30%以上混在したり、或いは該マルチフィラメント糸の細部に、濃染色性を示す単繊維の太部が全フィラメント糸の5%以上混在した場合は、染色後の濃染部と淡染部とのコントラストが小さくなり、カスリ調の外観が不鮮明なものになる。
【0008】
また、該マルチフィラメント糸の太部の長さが30mm以下であることが必要である。該太部の長さが30mmを越えると、染色後、濃染部が長くなり過ぎてカスリ調の外観がぼけたものとなる。
【0009】
更に、該マルチフィラメント糸の太さ斑の変動係数CVが8%以上であることが必要である。この変動係数CVが8%未満になると、染色時に濃淡差による霜降り効果はあるものの、太部と細部の繊度差・濃淡差が軽減されて明瞭な濃淡表現が得られなくなる。
【0010】
上記の太さ斑の変動係数CVは、計測器工業株式会社製のイーブネステスターKET−80Cを用いて、糸速8m/分、チャートスピード50cm/分の条件下で、ウースターノルマル値を測定して得られた数値であり、平均値からの太さの偏りの大きさを示す指標となるものである。
【0011】
また本発明では、該マルチフィラメント糸を構成する単繊維の、最も太い部分と最も細い部分の繊度の比が2以上であることが必要であり、繊維を構成する繊維軸方向に太細を有する単繊維中の最も太い部分と最も細い部分の太さの比が2未満の場合には、染色後に十分な濃淡効果が得られない。
【0012】
更に良好なカスリ調の外観が得られるようにするために、本発明のポリエステル太細マルチフィラメント糸は、染色後の濃染部の比率が淡染部の比率よりも小さいことが好ましく、該マルチフィラメント糸の太部の比率が40%以下が優れたカスリ調外観を提供する上で好ましい。
【0013】
また、単繊維を形成するポリエステルは、エチレンテレフタレートを主たる繰り返し単位とするポリエステルであり、5モル%未満の共重合成分を共重合させた共重合ポリエステル、及びポリアルキレングリコール、アルキルスルホン酸、無機物等、少量のブレンド成分を含有するポリエステル混合物であってもよい。共重合成分としては、芳香族ジカルボン酸類、脂肪族ジカルボン酸類、脂肪族ジオール類、脂環式ジオール類、芳香族ジオール類を用いることができ、具体的にはイソフタル酸、アジピン酸、セバシン酸、1,4ーブタンジオール、シクロヘキサンジオール、ビスフェノールAのエチレンオキシド付加物等を用いることができる。
【0014】
なお、これらの各フィラメントの断面形状は、丸断面、或いは三角、多葉、扁平等の異型断面のいずれであってもよく、特に限定されるものではない。
【0015】
また、上記構成からなる本発明のポリエステル太細マルチフィラメント糸は、更にこれを加工して紡績糸や仮撚加工糸等の任意の糸条形態にもなし得る。
【0016】
次に本発明のポリエステル太細マルチフィラメント糸は以下のように製造できる。
【0017】
本発明では、複屈折率が15×10−3〜40×10−3で、かつ300〜500kpaの流体処理により付与された交絡部を30〜80個/m具備する、複数の単繊維からなるポリエステル未延伸糸を一旦巻き取った後に、MDR(MDRは延伸温度85℃における未延伸糸の最大延伸倍率を表す。)の45%以上60%以下の延伸倍率、50℃以上80℃以下の延伸温度で加熱延伸することが必要である。
【0018】
該ポリエステル未延伸糸の複屈折率が15×10−3未満の場合、未延伸部から形成される太細マルチフィラメント糸の太部の耐熱性が低く、仮撚工程やアルカリ減量加工等、後工程での強度低下が大きく実用的な布帛強度が得られない。
【0019】
また、複屈折率が40×10−3を越える場合は、該ポリエステル未延伸糸のMDRが小さいため該未延伸糸に太細斑を付与する際の延伸倍率が低くなり、得られる太細マルチフィラメント糸の太部と細部の繊度差が小さく、染色後の濃淡差が小さくなり目的とするコントラストの強い外観は得られない。
【0020】
更に本発明では、該ポリエステル未延伸糸に付与される交絡数は1m当たり30〜80個が必要であり、交絡数が1m当たり30個未満では得られる太細マルチフィラメント糸の太部と細部の繊度差が小さく、濃染性を示す太部も長くなり明瞭なコントラストの外観が得られず、80個を超えると濃染部と淡染部の発生頻度が高く、全体の濃淡コントラストが低下しカスリ調より霜降り調外観となり目的とする外観は得られない。
【0021】
また、未延伸糸に具備される交絡は、紡糸工程で付与してもよいし、延伸工程の直前で付与してもよい。
【0022】
更に本発明では、延伸領域での延伸倍率がMDRの0.45倍未満の場合には、染色後濃染部となる太部の比率が高く、0.60倍よりも高い場合には、太部の比率が小さくなり、目的とするコントラストの強い外観は得られない。
【0023】
また、延伸温度が50℃未満では染色後濃染部となる太部の比率が高くなり、80℃を超えると太部の比率が小さくなる。
【0024】
延伸時の予熱延伸手段としては加熱された摩擦抵抗ピンまたは加熱ローラーのいずれでもよい。従来から太細繊維の製造方法として、延伸部に摩擦抵抗体を設置することが一般的であるが、未延伸糸に比較的強い交絡部を具備することで、マルチフィラメントでありながらあたかもモノフィラメントのように延伸することができる。この結果、マルチフィラメント中に延伸されたフィラメント群と延伸されていないフィラメント群を局在化させることができるため、摩擦抵抗体を必要とすることなく、十分な濃淡効果をもたらす太細繊維を得ることができる。
【0025】
【実施例】
以下、実施例をあげて本発明を説明する。
なお、実施例中の各特性値の測定、判定は、以下の方法に従った。
(複屈折率)得られたポリエステル未延伸糸をカネボウエンジニアリング製「分子配向度測定装置 DELTA−N」を使用して測定し、10点の平均値を複屈折率とした。
(交絡数) 該未延伸糸を水浴上に浮かべてマルチフィラメントを開繊させ、サンプル長30cm上の交絡部を目視で計測し、1m当たりの交絡数に換算した。
(糸斑) 該太細マルチフィラメント糸を計測器工業製「糸斑試験機 KET80C」を使用して、糸速=200m/分、レンジ=±12.5%、Nomalモードの測定条件で変動係数CVを測定した。
(マルチフィラメント糸の構成比率) 該太細マルチフィラメント糸を緯糸に使用した平織物を作成し、染色後、抜糸して濃染部(マルチフィラメント糸の太部)および淡染部(マルチフィラメント糸の細部)の断面について、カネボウエンジニアリング製「分子配向度測定装置 DELTA−N」を使用して各単繊維の繊維径を測定し、マルチフィラメント糸の太部、細部における単繊維の構成比率を求めた。尚、単繊維の最も細い部分に比べ2倍以上の繊度を有する部分を単繊維の太部とした。
(繊度比) WJLで該太細マルチフィラメント糸を緯糸に使用した平織物を作成し、染色後、抜糸して濃染部および淡染部の単繊維を無作為に選択しそれぞれ100点の繊維径を、カネボウエンジニアリング製「分子配向度測定装置 DELTA−N」を使用して測定した。最も太い部分の直径と細い部分の比を繊度比とした。
(太部長さ) WJLで該太細マルチフィラメント糸を緯糸に使用した平織物を作成し、染色後、抜糸して濃染部の長さを計測し、太部の長さとした。
(織物の外観) 該平織物を分散染料で染色を行い、目視にてスラブ調太細外観効果を評価した。
○:スラブ調外観効果は非常に良好である。
△:スラブ調外観効果は良好である。
×:スラブ調外観効果は不十分である。
○または△を合格レベルとする。
【0026】
(実施例1)
酸化チタンを0.5重量%含有する極限粘度が0.65のポリエチレンテレフタレートを、直径0.2mmの孔を72孔有する紡糸口金より、紡糸温度285℃で溶融紡糸し、油剤を付与した後、1710m/分の速度で引き取り、引き続いて一対のローラー間でエアー圧500kpaでエアー交絡処理を施しながら1700m/分で巻き取り190d/72fの未延伸糸を得た。得られた未延伸糸は、複屈折率が0.03、交絡数が1mあたり60個、最大延伸倍率(MDR)が3.35であった。この未延伸糸を延伸倍率1.85(MDR×0.55)、延伸ローラー温度75℃で延伸し、引き続き、延伸倍率1.015倍、温度120℃で緊張熱処理して100d/72fのポリエステル太細マルチフィラメント糸を得た。主な製糸条件、評価結果を表1に示した。
【0027】
得られたポリエステル太細マルチフィラメント糸からなる布帛は、濃染部と淡染部とのコントラストが大きく、良好なスラブ調外観を呈するものであった。
【0028】
(実施例2)
実施例1で得られた未延伸糸を60℃の熱ピンを介して、延伸倍率1.85で延伸し、引き続き、延伸倍率1.0倍、温度120℃で緊張熱処理して100d/72fのポリエステル太細マルチフィラメント糸を得た。主な製糸条件、評価結果を表1に示した。
【0029】
得られたポリエステル太細マルチフィラメント糸からなる布帛は、濃染部と淡染部とのコントラストが大きく、良好なスラブ調外観を呈するものであった。
【0030】
(実施例3、比較例1〜6)
実施例1で使用したポリマー、紡糸ノズルを使用して、表1に示す紡糸条件および延伸条件でポリエステル太細繊維を得た。主な製糸条件、評価結果を表1に示した。
【0031】
実施例3では、得られたポリエステル太細マルチフィラメント糸からなる布帛は、濃染部と淡染部とのコントラストが大きく、良好なスラブ調外観を呈するものであった。
【0032】
比較例1では、未延伸糸の複屈折率が高いため、得られる太細マルチフィラメント糸の太部と細部の繊度差が小さく、染色後の濃淡差が小さくなり目的とするコントラストの強い外観は得られなかった。
【0033】
比較例2では、未延伸糸の交絡数が少ないため、得られる太細マルチフィラメント糸の太部と細部の繊度差が小さく、濃染性を示す太部も長くなり明瞭なコントラストの外観が得られなかった。
【0034】
比較例3では、未延伸糸の延伸倍率が高いため、得られる太細マルチフィラメント糸の濃染部となる太部の比率が小さくなり、目的とするコントラストの強い外観は得られなかった。
【0035】
比較例4では、延伸倍率が低いため、得られる太細マルチフィラメント糸の濃染部となる太部の長さが長く、太部の比率も高く目的とするコントラストの強い外観は得られなかった。
【0036】
比較例5では、未延伸糸の複屈折率が低すぎるため、得られる太細マルチフィラメント糸の濃染部となる太部の比率が高く目的とするコントラストの強い外観は得られなかった。また、太部の耐熱性が低いため得られた布帛の強度も低いものとなった。
【0037】
比較例6では、未延伸糸に交絡を付与していないため、得られる太細マルチフィラメント糸の太部と細部の繊度差が小さく、濃染性を示す太部も長くなり明瞭なコントラストの外観が得られなかった。
【0038】
【表1】

Figure 0004236344
【0039】
【発明の効果】
本発明によるポリエステル太細マルチフィラメント糸は、染色後の濃染部と淡染部との周期がランダムであり、かつ濃染部と淡染部とのコントラストが大きなポリエステル太細マルチフィラメント糸であって、該太細マルチフィラメント糸により布帛を形成した時、淡染領域上に濃染部が短く明瞭に存在する外観がえられる。また、本発明のポリエステル太細マルチフィラメント糸の製造方法によれば、未延伸糸に流体処理による交絡を付与した後、太細斑することで単繊維の太部と細部の過度の分散を抑制し、濃染部と淡染部のコントラストが強く、かつ濃染部が強調されたカジュアル調外観の衣料を提供できる杢調太細マルチフィラメント糸を安定に得ることができる。[0001]
BACKGROUND OF THE INVENTION
TECHNICAL FIELD The present invention relates to a polyester thick multifilament yarn that provides a fabric that has a sharp, deep-colored portion and a strong contrast-like appearance when used as a fabric for clothing or interior use, and a method for producing the same. .
[0002]
[Prior art]
Conventionally, there is a thick multifilament yarn obtained by semi-drawing a non-stretched yarn composed of a plurality of single fibers as a means for dyeing light and shade of the fiber itself. It is known that a marbling appearance can be obtained due to the dyeing effect of thick and light-dyeing details. However, the above-mentioned thick multifilament yarn has a thick portion of a single fiber exhibiting a deep dyeability in a detail showing light dyeability, and when this is made into a fabric, the detail is a light color equivalent to a normal drawn yarn. The dyeing property is not provided, and the light and dark dyeing effect with sufficient contrast cannot be expressed. In order to obtain a light and dark dyeing effect with sufficient contrast, the thick portions and details of each single fiber forming the multifilament yarn are concentrated in the dark and light dyed portions of the multifilament yarn, respectively. For example, in Japanese Patent Application Laid-Open No. 60-59145, a thick multifilament yarn is obtained by drawing and heat-treating water while intermittently applying water to a highly oriented undrawn yarn, followed by further relaxation heat treatment. A method is described. However, this method requires complicated management to randomly and intermittently apply water to the yarn, and furthermore, it is difficult to increase productivity because the period of applying the spots is governed by time.
[0003]
Japanese Patent Application Laid-Open No. 57-117645 discloses a method for obtaining a fine fiber by pre-heating and drawing a yarn melt-spun by a direct spinning drawing method with a fluid jet nozzle, followed by preheating to Tg or less. Is described. However, in this method, in the air entanglement before the take-up roller, it is difficult to stably obtain a yarn having a high degree of entanglement that exceeds 20 pcs / m because the yarn tension is high and the tension level fluctuates. Although a thick multifilament yarn can be obtained, a thick multifilament yarn having a strong contrast between shades after dyeing cannot be obtained.
[0004]
[Problems to be solved by the invention]
The present invention solves such problems in the prior art, and a polyester in which the period between the deeply dyed portion and the lightly dyed portion after dyeing is random and the contrast between the darkly dyed portion and the lightly dyed portion is large. Polyester thick multifilament yarn, which is a thick multifilament yarn, and when the fabric is formed by the thick multifilament yarn, has a short dyeing area on the lightly dyed region and clearly exists, and a method for producing the same Is to provide.
[0005]
[Means for Solving the Problems]
The gist of the present invention is that a plurality of single fibers having a birefringence of 15 × 10 −3 to 40 × 10 −3 and 30 to 80 / m intertwined portions provided by a fluid treatment of 300 to 500 kpa. The polyester unstretched yarn is wound up and then heated and stretched under the conditions satisfying the following formulas a and b.
MDR × 0.45 ≦ stretch ratio ≦ MDR × 0.60 ·· a
50 ° C. ≦ Extension temperature ≦ 80 ° C. · b
(MDR represents the maximum draw ratio of undrawn yarn at a draw temperature of 85 ° C.)
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be specifically described.
The polyester thick multifilament yarn of the present invention is composed of a plurality of single fibers having thick spots in the fiber axis direction. In the present invention, a portion having a fineness more than twice that of the thinnest portion of the single fiber is defined as a thick portion of the single fiber.
[0007]
In the present invention, 70% or more of the single fiber constituting the thick part of the polyester thick multifilament yarn is composed of the thick part of the single fiber, and 95% or more of the single fiber constituting the details of the multifilament yarn is composed of the single fiber. It is necessary to consist of details. 30% or more of all filament yarns are mixed in the thick portion of the multifilament yarn, or the thick portion of the single fiber showing deep dyeability is included in the details of the multifilament yarn. When 5% or more of all the filament yarns are mixed, the contrast between the deeply dyed portion and the lightly dyed portion after dyeing becomes small, and the crisp appearance is unclear.
[0008]
The length of the thick part of the multifilament yarn needs to be 30 mm or less. When the length of the thick part exceeds 30 mm, after dyeing, the deeply dyed part becomes too long and the crisp appearance is blurred.
[0009]
Furthermore, the variation coefficient CV of the thickness variation of the multifilament yarn needs to be 8% or more. When this coefficient of variation CV is less than 8%, although there is a marbling effect due to the difference in shade during dyeing, the fineness difference and the shade difference between the thick portion and the details are reduced, and a clear shade expression cannot be obtained.
[0010]
The coefficient of variation CV of the above-mentioned thickness spot was measured by measuring the Wooster normal value under the conditions of a yarn speed of 8 m / min and a chart speed of 50 cm / min, using an Evestester KET-80C manufactured by Keiki Keiki Co., Ltd. It is a numerical value obtained by the above and serves as an index indicating the magnitude of the deviation of the thickness from the average value.
[0011]
In the present invention, the ratio of the fineness of the thickest part to the thinnest part of the single fiber constituting the multifilament yarn needs to be 2 or more, and the fiber is thick in the direction of the fiber axis constituting the fiber. When the ratio of the thickness of the thickest part to the thinnest part in the single fiber is less than 2, a sufficient shading effect cannot be obtained after dyeing.
[0012]
In order to obtain an even more crisp appearance, the polyester thick multifilament yarn of the present invention preferably has a ratio of the deeply dyed portion after dyeing smaller than that of the lightly dyed portion. The ratio of the thick part of the filament yarn is preferably 40% or less in order to provide an excellent scraped appearance.
[0013]
Further, the polyester forming the single fiber is a polyester having ethylene terephthalate as a main repeating unit, a copolymerized polyester obtained by copolymerizing less than 5 mol% of a copolymer component, polyalkylene glycol, alkylsulfonic acid, inorganic substance, etc. It may be a polyester mixture containing a small amount of blend components. As the copolymerization component, aromatic dicarboxylic acids, aliphatic dicarboxylic acids, aliphatic diols, alicyclic diols, aromatic diols can be used, specifically isophthalic acid, adipic acid, sebacic acid, 1,4-butanediol, cyclohexanediol, ethylene oxide adduct of bisphenol A, and the like can be used.
[0014]
In addition, the cross-sectional shape of each filament may be any of a round cross-section or an irregular cross-section such as a triangle, a multileaf, and a flat, and is not particularly limited.
[0015]
Further, the polyester thick multifilament yarn of the present invention having the above-described configuration can be further processed to form an arbitrary yarn form such as spun yarn or false twisted yarn.
[0016]
Next, the polyester thick multifilament yarn of the present invention can be produced as follows.
[0017]
In the present invention, the birefringence is 15 × 10 −3 to 40 × 10 −3, and it is composed of a plurality of single fibers having 30 to 80 / m entangled portions provided by fluid treatment of 300 to 500 kpa. After winding up the polyester undrawn yarn, the draw ratio of 45% or more and 60% or less of MDR (MDR represents the maximum draw ratio of the undrawn yarn at a drawing temperature of 85 ° C), and drawing of 50 ° C or more and 80 ° C or less It is necessary to heat and stretch at a temperature.
[0018]
When the birefringence of the polyester unstretched yarn is less than 15 × 10 −3 , the heat resistance of the thick portion of the thick multifilament yarn formed from the unstretched portion is low, and false twisting process, alkali weight reduction processing, etc. There is a significant decrease in strength in the process, and practical fabric strength cannot be obtained.
[0019]
When the birefringence exceeds 40 × 10 −3 , the MDR of the polyester unstretched yarn is small, so that the draw ratio when giving thick spots to the unstretched yarn is low, and the resulting thick multi-multi The fineness difference between the thick part and the detail of the filament yarn is small, and the difference in density after dyeing is small, so that the desired high contrast appearance cannot be obtained.
[0020]
Furthermore, in the present invention, the number of entanglements given to the polyester undrawn yarn needs to be 30 to 80 per meter, and if the number of entanglements is less than 30 per meter, the thick and fine portions of the fine multifilament yarn obtained The difference in fineness is small and the thick part showing darkness becomes long and a clear contrast appearance cannot be obtained. When the number exceeds 80, the occurrence of dark and light dyeing is high, and the overall light and dark contrast decreases. It becomes a marbling appearance from a curled tone and a desired appearance cannot be obtained.
[0021]
Further, the entanglement provided in the undrawn yarn may be given in the spinning process or may be given just before the drawing process.
[0022]
Furthermore, in the present invention, when the draw ratio in the drawing region is less than 0.45 times the MDR, the ratio of the thick portion that becomes the deeply dyed portion after dyeing is high, and when it is higher than 0.60 times, the thick portion becomes thick. The ratio of the parts becomes small, and the desired high contrast appearance cannot be obtained.
[0023]
Further, when the stretching temperature is less than 50 ° C., the ratio of the thick part that becomes the deeply dyed portion after dyeing is high, and when it exceeds 80 ° C., the ratio of the thick part is small.
[0024]
As a preheating stretching means at the time of stretching, either a heated frictional resistance pin or a heated roller may be used. Conventionally, as a method for producing a fine fiber, it is common to install a friction resistor in the drawn part, but by providing a relatively strong entangled part in the undrawn yarn, it is as if the monofilament Can be stretched. As a result, the filament group that has been stretched in the multifilament and the filament group that has not been stretched can be localized, so that it is possible to obtain a thick and fine fiber that provides a sufficient shading effect without the need for a frictional resistor. be able to.
[0025]
【Example】
Hereinafter, the present invention will be described with reference to examples.
In addition, the following method followed the measurement and determination of each characteristic value in an Example.
(Birefringence index) The polyester undrawn yarn obtained was measured using “Molecular orientation measuring device DELTA-N” manufactured by Kanebo Engineering, and the average value of 10 points was defined as the birefringence index.
(Number of confounding) The undrawn yarn was floated on a water bath to open the multifilament, and the entangled portion on the sample length of 30 cm was visually measured and converted to the number of entanglements per meter.
(Thread spot) The thick multifilament yarn is manufactured by Measuring Instruments Kogyo Co., Ltd. KET80C "was used, and the coefficient of variation CV was measured under the measurement conditions of yarn speed = 200 m / min, range = ± 12.5%, and normal mode.
(Composition ratio of multifilament yarn) A plain fabric using the thick multifilament yarn as a weft is prepared, and after dyeing, the yarn is removed and the deeply dyed portion (thick portion of the multifilament yarn) and lightly dyed portion (multifilament yarn) ), Measure the fiber diameter of each single fiber using “Molecular orientation measuring device DELTA-N” manufactured by Kanebo Engineering, and obtain the composition ratio of the single fiber in the thick part and detail of the multifilament yarn. It was. In addition, the part which has a fineness more than twice compared with the thinnest part of a single fiber was made into the thick part of a single fiber.
(Fineness ratio) Create a plain fabric using the thick multifilament yarn as a weft with WJL, and after dyeing, remove the yarn and randomly select the single fibers in the dark and lightly dyed areas to make 100 fibers each. The diameter was measured using “Molecular orientation measuring device DELTA-N” manufactured by Kanebo Engineering. The ratio of the diameter of the thickest part to the thin part was taken as the fineness ratio.
(Thick part length) A plain woven fabric using the thick multifilament yarn as a weft was prepared by WJL, and after dyeing, the yarn was removed and the length of the deeply dyed part was measured to obtain the length of the thick part.
(Appearance of woven fabric) The plain woven fabric was dyed with a disperse dye and visually evaluated for a slab-like thick appearance effect.
○: The slab-like appearance effect is very good.
Δ: Slab-like appearance effect is good.
X: The slab-like appearance effect is insufficient.
○ or △ is a pass level.
[0026]
Example 1
Polyethylene terephthalate containing 0.5% by weight of titanium oxide and having an intrinsic viscosity of 0.65 was melt-spun at a spinning temperature of 285 ° C. from a spinneret having 72 holes having a diameter of 0.2 mm, and an oil agent was applied. The yarn was taken up at a speed of 1710 m / min, and subsequently subjected to an air entanglement treatment at a pressure of 500 kpa between a pair of rollers to obtain an undrawn yarn of 190 d / 72 f wound up at 1700 m / min. The obtained undrawn yarn had a birefringence of 0.03, the number of entanglements of 60 per meter, and the maximum draw ratio (MDR) of 3.35. This undrawn yarn was drawn at a draw ratio of 1.85 (MDR × 0.55) and a draw roller temperature of 75 ° C., and subsequently subjected to tension heat treatment at a draw ratio of 1.015 times and a temperature of 120 ° C. to obtain a 100d / 72f thick polyester. A fine multifilament yarn was obtained. Table 1 shows the main spinning conditions and evaluation results.
[0027]
The resulting fabric made of polyester thick multifilament yarn had a high contrast between the deeply dyed portion and the lightly dyed portion, and exhibited a good slab-like appearance.
[0028]
(Example 2)
The undrawn yarn obtained in Example 1 was drawn at a draw ratio of 1.85 via a heat pin at 60 ° C. and subsequently subjected to tension heat treatment at a draw ratio of 1.0 and a temperature of 120 ° C. to be 100 d / 72 f. A polyester thick multifilament yarn was obtained. Table 1 shows the main spinning conditions and evaluation results.
[0029]
The resulting fabric made of polyester thick multifilament yarn had a high contrast between the deeply dyed portion and the lightly dyed portion, and exhibited a good slab-like appearance.
[0030]
(Example 3, Comparative Examples 1-6)
Using the polymer and spinning nozzle used in Example 1, polyester fine fibers were obtained under the spinning conditions and drawing conditions shown in Table 1. Table 1 shows the main spinning conditions and evaluation results.
[0031]
In Example 3, the resulting fabric composed of the polyester thick multifilament yarn had a large contrast between the deeply dyed portion and the lightly dyed portion, and exhibited a good slab-like appearance.
[0032]
In Comparative Example 1, since the birefringence of the undrawn yarn is high, the fineness difference between the thick portion and the details of the obtained thick and thin multifilament yarn is small, the difference in density after dyeing is small, and the target has a strong contrast appearance. It was not obtained.
[0033]
In Comparative Example 2, since the number of undrawn yarns is small, the difference in fineness between the thick and fine portions of the resulting thick multifilament yarn is small, and the thick portion showing dark dyeing is also long and a clear contrast appearance is obtained. I couldn't.
[0034]
In Comparative Example 3, since the draw ratio of the undrawn yarn was high, the ratio of the thick portion to be the deeply dyed portion of the resulting thick multifilament yarn was small, and the desired strong contrast appearance was not obtained.
[0035]
In Comparative Example 4, since the draw ratio was low, the thick part of the thick multifilament yarn to be darkly dyed had a long length, the ratio of the thick part was high, and the desired strong contrast appearance was not obtained. .
[0036]
In Comparative Example 5, since the birefringence of the undrawn yarn was too low, the ratio of the thick portion that was the deeply dyed portion of the resulting thick thin multifilament yarn was high, and the desired high contrast appearance was not obtained. Moreover, since the heat resistance of the thick part was low, the strength of the obtained fabric was low.
[0037]
In Comparative Example 6, since no entanglement is imparted to the undrawn yarn, the fineness difference between the thick portion and the detail of the resulting thick thin multifilament yarn is small, and the thick portion showing dark dyeing is also long and the appearance of clear contrast Was not obtained.
[0038]
[Table 1]
Figure 0004236344
[0039]
【The invention's effect】
The polyester thick multifilament yarn according to the present invention is a polyester thick multifilament yarn in which the period between the dark dyed portion and the light dyed portion after dyeing is random and the contrast between the deep dyed portion and the light dyed portion is large. Thus, when a fabric is formed with the thick multifilament yarn, an appearance in which the deeply dyed portion is short and clearly present on the lightly dyed region can be obtained. In addition, according to the method for producing a polyester thick multifilament yarn of the present invention, after untangling yarn is entangled by fluid treatment, it is suppressed from excessive dispersion of the thick portion and details of the single fiber by thickening. In addition, it is possible to stably obtain a toned thick multifilament yarn that can provide a casual-looking appearance with a strong contrast between the deeply dyed portion and the lightly dyed portion and with the deeply dyed portion emphasized.

Claims (1)

複屈折率が15×10−3〜40×10−3で、かつ300〜500kpaの流体処理により付与された交絡部を30〜80個/m具備する、複数の単繊維からなるポリエステル未延伸糸を一旦巻き取った後に、下記のa、b式を満足する条件下で加熱延伸することを特徴とするポリエステル太細マルチフィラメント糸の製造方法。
MDR×0.45≦延伸倍率≦MDR×0.60・・a
50℃≦延伸温度≦80℃・・b
(MDRは延伸温度85℃における未延伸糸の最大延伸倍率を表す。)
Polyester undrawn yarn composed of a plurality of single fibers having a birefringence of 15 × 10 −3 to 40 × 10 −3 and 30 to 80 entangled portions provided by fluid treatment of 300 to 500 kpa. Is wound and then heat-drawn under the conditions satisfying the following formulas a and b: A method for producing a polyester thick multifilament yarn characterized by the following.
MDR × 0.45 ≦ stretch ratio ≦ MDR × 0.60 ·· a
50 ° C. ≦ Extension temperature ≦ 80 ° C. · b
(MDR represents the maximum draw ratio of undrawn yarn at a draw temperature of 85 ° C.)
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