JP2004131870A - Method for producing polyester-based conjugate fiber - Google Patents

Method for producing polyester-based conjugate fiber Download PDF

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Publication number
JP2004131870A
JP2004131870A JP2002297031A JP2002297031A JP2004131870A JP 2004131870 A JP2004131870 A JP 2004131870A JP 2002297031 A JP2002297031 A JP 2002297031A JP 2002297031 A JP2002297031 A JP 2002297031A JP 2004131870 A JP2004131870 A JP 2004131870A
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Japan
Prior art keywords
yarn
dtex
composite yarn
package
tension
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JP2002297031A
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Japanese (ja)
Inventor
Yoshitoki Mori
森 義斉
Yasuki Kobayashi
小林 靖希
Masayuki Sato
佐藤 正幸
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Toray Industries Inc
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Toray Industries Inc
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Priority to JP2002297031A priority Critical patent/JP2004131870A/en
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for producing a polyester-based conjugate fiber, by which in producing a side-by-side type conjugate fiber using a PTT (polytrimethylene terephthalate), winding tension and tension variation are made in proper ranges, a yarn is wound on a bobbin package so that neither end breakages nor fluffs occur and the conjugate yarn has neither crepes/wrinkles nor shrinkage width variation of gray fabric and exhibits excellent qualities and high stretchability when used as a fabric. <P>SOLUTION: In producing the side-by-side type polyester-based conjugate fiber in which a high-viscosity component is the PTT comprising ≥80 mol % of a repeating unit composed of trimethylene terephthalate, the yarn is wound on the bobbin package at 0.04-0.1 cN/dtex average winding tension and ≤0.04 cN/dtex tension variation width. <P>COPYRIGHT: (C)2004,JPO

Description

【0001】
【発明の属する技術分野】
本発明は、ポリトリメチレンテレフタレートを用いたサイドバイサイド型複合糸の製造方法に関するものである。
【0002】
【従来の技術】
近年、ストレッチブームによりポリエステル糸にストレッチ性、捲縮性、嵩高性を与えるため種々の方法が採用されており、特にポリマー自身が高い伸縮性を有するポリトリメチレンテレフタレート(以下、PTTと略す)を用いた繊維の工業化への取り組みが活発に行われている。
【0003】
また、従来より、樹脂種、粘度、重合度あるいは熱収縮特性などの性質の異なる2種の熱可塑性ポリマーをサイドバイサイド型複合繊維として溶融紡糸することで、捲縮発現性を付与する技術が広く知られており、このサイドバイサイド型複合繊維にPTTを用いて繊維に高いストレッチ性を付与することが種々検討されている。3官能性共重合成分を有さないPTTと、3官能性共重合成分が0.05〜0.2モル%共重合されたPTTまたは固有粘度が0.15〜0.3低いPTTとがサイドバイサイド型に複合された潜在捲縮性ポリエステル複合繊維について、1500m/分の速度で一旦未延伸糸を巻き取った後に、延伸温度60℃で延伸し、120℃の非接触ヒーターを用いてセットし、延伸速度600m/分で75デニール/36フィラメントの延伸糸を得る方法が提案されている(例えば、特許文献1参照)。
【0004】
また、固有粘度が0.9〜1.5のPTTと固有粘度が0.3〜0.7のポリエチレンテレフタレートとをサイドバイサイド型に複合したポリエステル系複合繊維について、紡糸速度3000m/分で一旦未延伸糸を巻き取った後、予熱温度80℃、セット温度180℃で1.8倍に延伸して110デシテックス/24フィラメントの延伸糸を得る方法も提案されている(例えば、特許文献2参照)。
【0005】
これらいずれの方法についても、公知の紡糸延伸2工程法をそのまま採用しているものであり、高いストレッチ性を有するPTTを用いたサイドバイサイド型複合繊維を毛羽や糸切れの発生無く、安定した生産を行うには至らないものであった。
【0006】
【特許文献1】
特開2000−256918号公報(第8頁、実施例1)
【0007】
【特許文献2】
特開2001−288621号公報(第6頁、実施例1)
【0008】
【発明が解決しようとする課題】
本発明の目的は、前記のような従来技術の有する欠点・問題点を解消し、織編物に使用した際に優れたストレッチ性を発揮し、また加撚り無しで使用してもシボ・シワの無い表面品位を発揮するポリエステル系複合糸を製造するに際し、毛羽や糸切れの発生が無く、製糸性・加工性ともに良好なポリエステル系複合糸を製造する方法を提供することにある。
【0009】
【課題を解決するための手段】
前記目的を達成するための本発明は、高粘度成分が、繰り返し単位の80モル%以上がトリメチレンテレフタレートからなるポリトリメチレンテレフタレートであるサイドバイサイド型複合糸を製造するに際し、平均巻き取り張力0.04〜0.1cN/dtex、張力変動幅0.04cN/dtex以下で、ボビンパッケージに巻き取ることを特徴とするポリエステル系複合糸の製造方法である。
【0010】
【発明の実施の形態】
以下、本発明を詳細に説明する。
【0011】
本発明において、サイドバイサイド型複合糸(以下、複合糸と略す)を構成する2成分の重合体のうち、高粘度成分は、繰り返し単位の80モル%以上がトリメチレンテレフタレートからなるポリトリメチレンテレフタレートである。PTTは、結晶構造においてアルキレングリコール部のメチレン鎖がゴーシュ−ゴーシュの構造(分子鎖が90度に屈曲)であること、さらにはベンゼン環同士の相互作用(スタッキング、並列)による拘束点密度が低く、フレキシビリティーが高いことから、メチレン基の回転により分子鎖が容易に伸長・回復するという特有のストレッチ性を有している。このPTT固有のストレッチ性を複合糸においても十分発揮するためである。尚、本発明において、複合糸を構成する2成分の複合比率は伸縮性付与に用いられる複合比率(容積比)であり、65:35〜35:65の範囲であり、好ましくは60:40〜40:60である。
【0012】
複合糸を構成する2成分の重合体のうち、低粘度成分はポリエチレンテレフタレートやポリブチレンテレフタレートなどを用いれば良く、また低粘度のポリトリメチレンテレフタレートを用いても良いが、サイドバイサイド型複合により十分なストレッチ性をえるために、2成分間の固有粘度差は0.2以上とすることが好ましく、また複合安定性などを考慮し、固有粘度差は1.5以下とすることが好ましい。
【0013】
また、2成分のうちの一方、または両方の成分には、本発明の目的を損なわない限り、必要に応じてイソフタル酸、2−2ビス{4−(β−ヒドロキシ)フェニル}プロパン等の共重合成分や、酸化チタン等の艶消し剤、ヒンダートフェノール系化合物等の酸化防止剤、顔料、難撚剤、抗菌剤、消臭剤、導電性付与剤等が配合されていても良い。
【0014】
本発明の製造方法において、平均巻き取り張力は0.04〜0.1cN/dtexの範囲である。平均巻き取り張力が0.04cN/dtexを下回った場合、得られたボビンパッケージは非常に柔らかいものとなり、パッケージを取り出す際や、梱包、或いは高次工程への運送の際にパッケージ崩れを発生する。
【0015】
また、一旦未延伸糸を巻き取った後に、延伸機にて延伸糸を得る、いわゆる2工程法で製糸する場合では、延伸熱セット後の糸条は、図1に示す様にラペットガイドという輪状ガイドの中を通過した後に、トラベラーを介してボビンに巻き取られる。このとき、平均巻き取り張力が0.04cN/dtexを下回る張力で巻き取ると、トラベラーの滑走性が非常に不安定になり、巻き取り中の遠心力によるラペットガイドとトラベラーの間の糸条の膨らみ(以下、バルーニングと称す)が大きくなり過ぎ、隣接するボビンパッケージや、隣接するボビンパッケージを仕切る錘間仕切板にバルーニング糸条が接触し、糸切れや毛羽を誘発する。
【0016】
また、一旦未延伸糸を巻き取らずに延伸して巻き取る、いわゆる直接紡糸延伸法で製糸する場合では、平均巻き取り張力が0.04cN/dtexを下回る張力では、最終ローラーとボビンパッケージ間の糸条走行安定性が低下し安定して巻き取ることが出来ない。
【0017】
また、平均巻き取り張力が0.1cN/dtexを上回る張力でボビンパッケージに巻き取った場合は、2工程法では、バルーニングが小さくなりすぎて、ボビン上部へのバルーニング糸条の接触やトラベラーでの擦過によって糸切れや毛羽を誘発し、直接紡糸延伸法では、パッケージが硬くなり過ぎてしまい、ワインダーからのパッケージ払い出しが困難になるばかりでなく、最終ローラーとボビン間に設置された糸道ガイドでの擦過による毛羽を誘発する。
【0018】
本発明の製造方法において、張力変動幅は0.04cN/dtex以下である。0.04cN/dtexを上回る張力変動を有した状態でパッケージを形成した場合、2工程法、直接紡糸延伸法のいずれの方法においても、複合糸の顕在捲縮に長手方向のバラツキが発生し、複合糸を織編物に使用した際の布帛表面にシボやシワが発生したり、生機幅の収縮斑が発生する。
【0019】
また、2工程法では、トラベラー滑走性が不安定となるために、毛羽が発生しやすくなる。これは、トラベラー滑走速度が変動した場合に、トラベラーとボビンパッケージ間の糸条が緊張・緩和を繰り返すために、複合糸の顕在捲縮が発現しトラベラーに引っ掛かり単糸が切れて毛羽を発生するものと推定される。
【0020】
直接紡糸延伸法の場合では、同様に複合糸の顕在捲縮が最終ローラーとボビン間に設置された糸道ガイドで引っ掛かり単糸が切れて毛羽を発生する。
【0021】
よって、本発明の製造方法においては、平均巻き取り張力は0.04〜0.1cN/dtex、好ましくは0.05〜0.08cN/dtexである。また、張力変動幅は0.04cN/dtex以下、好ましくは0.02cN/dtexである。
【0022】
この平均巻き取り張力範囲および張力変動幅について、2工程法による製糸では、複合糸の繊度に対して、適正な重量のトラベラーとスピンドル初期回転数および延伸速度を厳選し、直接紡糸延伸法による製糸では、最終ローラーとパッケージ周速度の間に適正なリラックス率を厳選する必要がある。さらにいずれの製糸方法においても、巻き取りが進行してパッケージ径が変化しても巻き取り張力が変化しない、もしくは張力変動幅が0.04cN/dtex以下になるように、パッケージ径変化に対応したスピンドル回転数の減速率を適正なものとすることによって、初めて達成しうるものである。
【0023】
なお、2工程法による製糸においては、56デシテックス24フィラメントの複合糸を本発明の平均巻き取り張力および張力変動幅を満足して1.5kgのパッケージを形成するためには、トラベラーは金井重要工業社製SB−7#32(重量:1.49g/100個)〜#30(重量:2.59g/100個)、延伸速度は600〜800m/分、スピンドル初期回転数は8000〜8700rpm、巻き取り完了時のスピンドル最終回転数は6600〜7200rpm(パッケージ径変化に合わせた減速を行う)の範囲より厳選しなくてはならない。
【0024】
なお、本発明における平均巻き取り張力とは、パッケージに延伸糸を巻き始めてから3分後より、パッケージを形成し巻き終わる1分前までの間の、パッケージ巻き取り直前の張力を15分毎に測定した値(cN)を延伸糸繊度で除した値(cN/dtex)の平均値であり、張力計はROTHSCHILD MiniTens R−046を用いたものであり、2工程法ではラペットガイド直上の糸条で測定し、直接紡糸延伸法では最終ローラーと糸道ガイド間の糸条で測定するものである。また、張力変動幅とは、15分毎に測定した張力における最大値と最小値の差(cN/dtex)である。
【0025】
本発明において、複合糸をボビンパッケージに巻き取ることが重要である。チーズ状パッケージとした場合、パッケージ表面をフラットにするために、図4に示すようなタッチロールと呼ばれるローラーがワインダーに設置されており、このタッチロールがパッケージ表面に一定の圧力を加えながら巻き取りを行っているが、この場合、巻き取り中のパッケージ表面が巻き始めから巻き取り完了までの間、常にタッチロールと接触しているために毛羽が発生する。また糸条とタッチロール表面との摩擦によって、糸長斑が発生しやすく、単糸タルミが発生しやすいという欠点がある。また、チーズ状パッケージでは、巻き取り完了後や巻き取りが進行した段階で、パッケージ端面部分がタッチロールからの圧力から解放されるが、この際に複合糸の顕在捲縮がパッケージ端部のみで発現してしまい、織編工程でのパッケージからの糸条解舒時に、パッケージ端部での解舒糸条引っ掛かりによる解舒切れや毛羽を発生する。
【0026】
なお、本発明における複合糸のボビンパッケージは、緯糸使い織物などを製織する場合、次のボビンパッケージとつなぎ込んで使用し、経糸使い織物あるいは各種編物においても同様の糸つなぎ込み作業あるいは糸交換作業があり、これらの作業頻度を軽減することがコストダウンの観点から、極めて重要であることから、ボビンパッケージ巻き量は1kg以上の複合糸が巻かれていることが好ましく、さらに好ましくは1.5kg以上、一層好ましくは2.0k以上である。
【0027】
本発明において、複合糸の糸横断面の2成分の接合面の接線と糸外周との2つの交点A、Bを結んだ線分ABの中心を通り、線分ABと直交した直線Xと糸外周との2つの交点をC、Dとして、交点C、Dを結んだ線分CDの中心を通り、線分CDと直交した直線Yと糸外周との2つの交点をE、Fとしたとき、線分CDと線分EFの長さの比CD/EFを1.2〜4.0とし、好ましくは、1.5〜2.0である。
【0028】
CD/EFは1.2以上にすることにより、複合糸断面の2成分の接合面に対して、両ポリエステル成分が肉厚になり複合糸の捲縮発現性を十分発現してストレッチ性能を発揮する。また、織編物に使用し収縮処理により捲縮発現させた際には織編物表面にシボやシワが無く表面品位の優れたものになる。加えて、両ポリエステルの粘度差に起因したズリ速度差による溶融紡糸の吐出糸条の屈曲を小さく抑え口金面に付着する糸切れを防止して、安定した紡糸をすることが出来る。
【0029】
一方、この比を5.0以下とすることにより、複合糸表面の反射光強度を抑えて、織編物表面でのイラツキ感を無くして品位の良好なものにして、かつ溶融紡糸時や製織・編成加工時に通過するガイド類、例えば交絡付与ガイド、給油ガイド、糸道ガイドなどや編針での糸削れを防止して、製糸性、高次通過性を向上せしめることができ、吐出糸条の糸長手方向の均一性を改善できるものである。
【0030】
本発明における複合糸の顕在捲縮率は20%以上であることが好ましい。顕在捲縮率を20%以上とすることにより、得られる布帛等の繊維製品はストレッチ性が高く、風合いもソフト感を有するものとなる。より好ましくは25%以上である。
【0031】
本発明の製造方法において、、複合糸には5個/m以上の交絡を付与することが好ましい。ボビンパッケージ品位を良好にするだけでなく、織編工程通過性を向上させるものであり、より好ましくは10個/m以上である。
【0032】
【実施例】
以下、実施例により詳細に説明する。なお、本発明の実施例中における測定項目は次の通りである。
【0033】
1.固有粘度
o−クロロフェノールを溶媒として、25℃で常法に従って求めた。
【0034】
2.顕在捲縮率
総繊度が3330dtexとなるように巻き数を調整してカセを作る。このカセに5.88cN(6g)の荷重をかけ、さらに2.94cN(300g)の荷重をかける。この時の長さをL0とする。その後2.94cN(300g)の荷重を取り去り、5.88cN(6g)の荷重をかけた状態で1分後の長さをL1とし、次式により求めた。
【0035】
顕在捲縮率(%)=(L0−L1)/L0×100。
【0036】
3.繊度
JIS L1090−5−3の方法で測定した。
【0037】
4.強度、伸度
JIS L1090−5−5−1の方法で測定した。
【0038】
5.毛羽数
図2に示す東レ社製フライカウンターを用い、得られたマルチフィラメントのパッケージ8個について、パッケージ採取直後から温度26℃、湿度90%の雰囲気中で1週間保管した後に、550m/分の速度で解舒しながら、糸長30000mについて、毛羽個数を測定した値(個/万m)で以下の通り評価した。
【0039】
○:毛羽個数が0.5個/万m未満
△:毛羽個数が0.6〜2個/万m
×:毛羽個数が3個/万mを超える。
【0040】
6.高次加工性
パッケージ採取直後から温度26℃、湿度80%の雰囲気中で1ヶ月保管した後に、糸仕掛け本数645本、巻き取り速度250m/分、ビーム長200,000mを整経した際の毛羽・糸切れによる整経機停台回数で評価し、停台回数20回以下を合格基準とした。
【0041】
7.布帛ストレッチ率
経糸に一般の56dtex−18Fのポリエステルマルチフィラメント丸断面糸に150T/mの甘撚りを加えたものを用い、緯糸に得られた複合糸を加撚り無しで用いて平織り組織にて製織し、生機精練および95℃×40分間の熱水処理し、風乾して得た布帛より緯糸方向に幅5cm、長さ20cmに切り分けて一方を固定して吊り下げ、下方の端に1.8kg荷重を掛けて30秒後の伸長L3(cm)を測定し、次式より布帛ストレッチ率(%)を求めた。
【0042】
布帛ストレッチ率(%)={(L3−20)/20}×100。
【0043】
8.布帛品位(1)
ストレッチ性の評価に用いた布帛を経糸方向に幅50cm、長さ50cmに切り、表面にあるシボ・シワの本数で以下の通り評価し、○および△を合格基準とした。
【0044】
0〜1本:○、2〜5本:△、6本以上:×。
【0045】
9.布帛品位(2)
ストレッチ性の評価に用いた布帛を経糸方向に幅50cm、長さ50cmに切り、20人のパネラーによる官能評価を行った。市販の40ワット蛍光灯下で布帛表面を観察し、表面にイラツキ感が無いと判断した人数で評価を行い、○および△を合格基準とした。
【0046】
18人以上:○、14〜17人:△、13人以下:×。
【0047】
実施例1
複合紡糸装置を用いて、固有粘度1.47のPTTと固有粘度0.51のPETを各々溶融し、幅2.5mm×長さ5mmの溝型2成分合流部と24孔で幅0.15mm×長さ0.71mmのスリット型吐出孔を有する複合紡糸口金から、糸横断面のPTTとPETの容積比が1:1となるように吐出比を調整して、270℃の紡糸温度で紡出した。次いで、紡出糸条を空気流で冷却固化した後、0.8重量%の油剤を付与し、1400m/分の速度でCD/EF=1.4の未延伸糸を一旦巻き取った。ついで、第1ロールにおいて60℃で予熱後、第2ロールとの間で延伸倍率3.1倍で延伸すると共に125℃で熱セットを施し、さらに第2ロールと第3ロールとの間で1.4%のリラックスを付与しながら、交絡エア圧力0.15MPaの旋回エア流にて糸条を開繊交絡させる交絡ガイドにて、交絡を付与した後にラペットガイド、トラベラーを介した後に56デシテックス24フィラメントの複合糸をボビンに1.5kg巻き取った。本実施例に用いた2工程法の概略図を図3に示す。
【0048】
この際、トラベラーは金井重要工業社製SB−7#30(重量:2.59g/100個)を用い、延伸速度600m/分とし、スピンドル回転数は、8000rpmの初期回転数から巻き取りが進行しパッケージが大きくなるに従って徐々に回転数を下げていった。このとき、平均巻き取り張力は0.06cN/dtex、張力変動幅は0.01cN/dtexであった。
【0049】
得られた複合糸は強度3.9cN/dtex、伸度33.5%、交絡数8.4個/m、顕在捲縮率31.4%、毛羽数0.08個/万m、製経機停台回数8回、布帛ストレッチ率22%となり、原糸物性および品位には問題なく、高次加工性は良好であった。また、複合糸を用いた布帛では、シボ・シワおよびイラツキ感も無く、優れた表面品位とストレッチ性を兼ね備えたものが得られた。結果をまとめて表1に示す。
【0050】
実施例2
実施例2ではCD/EF=4.0となるように、複合紡糸口金の吐出孔形状(スリット幅、スリット長)を変更し、実施例1と同様の方法で複合紡糸した。このとき、平均巻き取り張力は0.07cN/dtex、張力変動幅は0.02cN/dtexであった。また、得られた複合糸は、強度3.8cN/dtex、伸度25%、交絡数7.5個/m、顕在捲縮率34.8%、毛羽数0.8個/万mとなり、原糸物性では伸度が若干低下したが、実際使用するには問題無い品位と物性を有し、これを用いた布帛においては、若干イラツキ感があるものの布帛ストレッチ率24%となり高ストレッチ織物と言うに十分なストレッチ性を有しており、整経機停台回数19回となったが生産可能なレベルであった。
【0051】
実施例3
実施例1と同様の複合紡糸口金を用い、糸横断面のPTTとPETの容積比が1:1となるように吐出比を調整して、270℃の紡糸温度で紡出した。次いで、紡出糸条を空気流で冷却固化した後、0.8重量%の油剤を付与し、表面温度55℃、速度1050m/分の第1ホットローラーで引き取り、引き続いて表面温度150℃、速度4200m/分の第2ホットローラーで延伸熱セットした。さらに第2ホットローラーと第1リラックスローラーとの間はリラックス率0%とし、第1リラックスローラーと第2リラックスローラーとの間に1%のリラックス率を付与しながら、交絡エア圧力0.20MPaの旋回エア流にて糸条を開繊交絡させる交絡ガイドにて交絡付与し、さらに第2リラックスローラーとパッケージ周速度との間に1%のリラックス率を付与して複合糸2.0kgをボビンパッケージに巻き取った。本実施例に用いた直接紡糸延伸法の概略図を図4に示す。
【0052】
この際、ボビンパッケージ周速度が一定となるように、巻き取りが進行し、パッケージが大きくなるに従って、徐々に回転数を下げていった。このとき、平均巻き取り張力は0.08cN/dtex、張力変動幅は0.02cN/dtexであった。
【0053】
得られた複合糸は、強度3.5cN/dtex、伸度28%、交絡数8.1個/m、顕在捲縮率29.7%、毛羽数1.0個/万mとなり、実際使用するには問題無い品位と物性を有し、これを用いた布帛においては、表面品位は良好であり布帛ストレッチ率21%となり高ストレッチ織物と言うには問題のないストレッチ性を有しており、整経機停台回数15回であり生産可能なレベルであった。
【0054】
実施例4
高粘度成分として固有粘度2.13のPTTと、低粘度成分として固有粘度1.12のPTTを各々溶融した後に、横断面の高粘度PTTと低粘度PTTの容積比が1:1となるように吐出比を調整して、260℃の紡糸温度で紡出したこと以外、実施例3と同様の方法で複合糸のボビンパッケージを得た。この際、平均巻き取り張力0.04cN/dtex、張力変動幅0.01cN/dtexとなるようにボビンパッケージ周速度を調整して複合糸1.0kgのボビンパッケージを得た。得られた複合糸は、強度2.8cN/dtex、伸度28%、交絡数9.0個/m、顕在捲縮率38.0%、毛羽数1.5個/万mとなり、実際使用するには問題無い品位と物性を有し、これを用いた布帛においては、表面品位は良好であり布帛ストレッチ率31%となり優れたストレッチ性を有しており、整経機停台回数15回であり生産可能なレベルであった。
【0055】
実施例5
トラベラーを金井重要工業社製SB−7#32(重量:1.49g/100個)としたこと以外、実施例1と同様の方法で複合糸のボビンパッケージを得た。このとき、平均巻き取り張力は0.05cN/dtex、張力変動幅は、0.03cN/dtexであった。
【0056】
得られた複合糸は、強度3.8cN/dtex、伸度34.1%、交絡数8.9個/m、顕在捲縮率35.2%、毛羽数0.9個/万mとなり、実際使用するには問題無い品位と物性を有し、これを用いた布帛においては、ストレッチ率27%であり表面品位はシボ・シワおよびイラツキ感も無く、優れた表面品位とストレッチ性を兼ね備えたものが得られた。また、整経機停台回数は18回であり生産可能なレベルであった。
【0057】
【表1】

Figure 2004131870
【0058】
比較例1
トラベラーを金井重要工業社製SB−7#25(重量:4.54g/100個)としたこと以外、実施例1と同様の方法で複合糸のボビンパッケージを得た。このとき、平均巻き取り張力は0.17cN/dtex、張力変動幅は、0.04cN/dtexであった。また、得られた複合糸は、強度3.4cN/dtex、伸度31.2%、交絡数7.0個/m、顕在捲縮率28.4%、毛羽数3.1個/万mとなり、これを用いた布帛においては、表面品位はシボ・シワおよびイラツキ感は無く、表面品位とストレッチ性は問題無かったが、整経機停台回数は28回であり実際生産するのは困難なレベルであった。
【0059】
比較例2
トラベラーを金井重要工業社製SB−7#33(重量:1.20g/100個)としたこと以外、実施例1と同様の方法で複合糸のボビンパッケージを得た。このとき、平均巻き取り張力は0.03cN/dtex、張力変動幅は、0.02cN/dtexであった。また、得られた複合糸は、強度3.4cN/dtex、伸度31.2%、交絡数8.6個/m、顕在捲縮率28.0%、毛羽数4.2個/万mとなり、これを用いた布帛においては、表面品位はシボ・シワおよびイラツキ感は無く、表面品位とストレッチ性は問題無かったが、整経機停台回数は31回であり実際生産するのは困難なレベルであった。
【0060】
比較例3
平均巻き取り張力が1.7cN/dtexとなるように、ボビンパッケージ周速度を変更したこと以外、実施例3と同様の方法で複合糸2.0kgのボビンパッケージを得た。巻き取り途中、最終ローラーとボビン間に設置された糸道ガイドにて、単糸切れや糸切れを発生したが、幾度と無く巻き取り直しを実施し、2kgパッケージを得たが、得られた複合糸は、強度3.5cN/dtex、伸度27%、交絡数7.9個/m、顕在捲縮率25.2%、毛羽数6.1個/万mとなり、これを用いた布帛のストレッチ率は20%と問題なかったが、整経機停台回数は41回であり実際生産するのは困難なレベルであった。
【0061】
比較例4
張力変動幅が0.6cN/dtexとなるように、ボビンパッケージ周速度を意図的に変動させたこと以外、実施例3と同様の方法で複合糸のボビンパッケージを得たが、巻き取り途中で最終ローラーとボビン間に設置された糸道ガイドにて、単糸切れや糸切れが頻発した。得られた複合糸は、強度3.6cN/dtex、伸度29%、交絡数8.2個/m、顕在捲縮率29.0%、毛羽数4.6個/万mとなり、これを用いた布帛のストレッチ率は23%と問題なかったが、布帛表面にシボ・シワが発生したり、生機収縮幅が大きい部分が発生し、品位劣位であった。また、整経機停台回数は33回であり実際生産するのは困難なレベルであった。なお、布帛表面シボ・シワ発生部分や生機収縮幅の大きい部分の複合糸について、巻き取り履歴との相関を調査した結果、シボ・シワ発生部分は巻き取り張力を平均巻き取り張力に対して、0.06cN/dtex高目に変動させた際の複合糸が該当しており、生機収縮幅が大きい部分は巻き取り張力を平均巻き取り張力に対して、0.06cN/dtex低目に変動させた際の複合糸が該当することが判明した。この巻き取り張力変動によるシボ・シワまたは生機収縮幅の変化についての詳細なメカニズムについては、未だ明確には出来ていないが、恐らく巻き取った複合糸の顕在捲縮形態が変化するために、製織時の解舒張力が変動したり生機加工時の織り密度が変化したりすることが予想される。
【0062】
比較例5
実施例1と同じ紡糸口金およびポリマを用いて、図5に示すようなチーズ状パッケージ用ワインダーを用いて、2.0kgの複合糸チーズ状パッケージを得た。得られた複合糸は、強度3.5cN/dtex、伸度27%、交絡数8.3個/m、顕在捲縮率29.7%、毛羽数8.0個/万mとなり、パッケージ表面に幾つかの単糸タルミが目視で確認された。また、製経加工する際には、パッケージ端部で顕在捲縮が発現してしまい、パッケージ端部での解舒糸条引っ掛かりによる解舒切れや毛羽を発生し、さらには前述した単糸タルミが製経機の糸道ガイドで引っ掛かってしまったために、製経機停台回数は51回となり実際生産するには困難なものとなった。
【0063】
【表2】
Figure 2004131870
【0064】
【発明の効果】上述したように、本発明によれば、PTTを用いたサイドバイサイド型複合糸を製造するに際し、巻き取り張力と張力変動を適正な範囲とし、ボビンパッケージに巻き取ることによって、糸切れや毛羽発生なく布帛に用いた際にシボ・シワおよび生機収縮幅変動のない良好な品位と高いストレッチ性を発揮するポリエステル系複合糸を得ることができる。
【図面の簡単な説明】
【図1】本発明における複合糸横断面形状の一例を示す説明図
【図2】本発明における毛羽個数の測定方法を示す説明図
【図3】本発明に用いる2工程法の一例を示す概略図
【図4】本発明に用いる直接紡糸延伸法の一例を示す概略図
【図5】チーズ状パッケージの巻き取りに用いるワインダーの一例を示す概略図
【符号の説明】
1:パッケージ
2:毛羽検知器
3:解舒装置
4:糸条吸引装置
5:フライカウンター本体
6:紡糸口金
7:糸条冷却装置
8:第1ロール
9:第2ロール
10:未延伸糸パッケージ
11:第1ホットローラー
12:第2ホットローラー
13:トラベラー
14:トラベラー滑走レール
15:錘間仕切板
16:オイリングローラー
17:第1リラックスローラー
18:第2リラックスローラー
19:糸道ガイド
20:ボビンパッケージ用ワインダー
21:交絡ガイド
22:タッチロール
23:チーズ状パッケージ[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for producing a side-by-side composite yarn using polytrimethylene terephthalate.
[0002]
[Prior art]
In recent years, various methods have been adopted for imparting stretchability, crimpability, and bulkiness to polyester yarn by a stretch boom. In particular, polytrimethylene terephthalate (hereinafter abbreviated as PTT) in which the polymer itself has high elasticity is used. Active efforts are being made to industrialize the fibers used.
[0003]
Conventionally, a technique for imparting crimping property by melt spinning two types of thermoplastic polymers having different properties such as resin type, viscosity, degree of polymerization and heat shrinkage properties as side-by-side type composite fibers has been widely known. Various studies have been made to impart high stretchability to the side-by-side type conjugate fiber using PTT. PTT having no trifunctional copolymer component and PTT copolymerized with 0.05 to 0.2 mol% of the trifunctional copolymer component or PTT having an intrinsic viscosity of 0.15 to 0.3 lower are side-by-side. About the latently crimpable polyester composite fiber composited in the mold, after winding the undrawn yarn once at a speed of 1500 m / min, it is drawn at a drawing temperature of 60 ° C, and set using a non-contact heater at 120 ° C. A method of obtaining a drawn yarn of 75 denier / 36 filaments at a drawing speed of 600 m / min has been proposed (for example, see Patent Document 1).
[0004]
In addition, a polyester-based composite fiber in which PTT having an intrinsic viscosity of 0.9 to 1.5 and polyethylene terephthalate having an intrinsic viscosity of 0.3 to 0.7 are composited in a side-by-side type, is not drawn at a spinning speed of 3000 m / min. A method has also been proposed in which, after winding the yarn, it is stretched 1.8 times at a preheating temperature of 80 ° C. and a set temperature of 180 ° C. to obtain a drawn yarn of 110 dtex / 24 filaments (for example, see Patent Document 2).
[0005]
In any of these methods, the known spin-drawing two-step method is employed as it is, and a stable production of side-by-side type composite fibers using PTT having high stretchability without generation of fluff or yarn breakage. It was hard to do.
[0006]
[Patent Document 1]
JP 2000-256918 A (page 8, Example 1)
[0007]
[Patent Document 2]
JP 2001-288621 A (page 6, Example 1)
[0008]
[Problems to be solved by the invention]
An object of the present invention is to eliminate the drawbacks and problems of the prior art as described above, exhibit excellent stretchability when used for woven or knitted fabrics, and to reduce grain and wrinkle even when used without twisting. It is an object of the present invention to provide a method for producing a polyester-based composite yarn having no fuzz or yarn breakage, and having a good yarn-making property and processability when producing a polyester-based composite yarn exhibiting a surface quality that is not present.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a side-by-side composite yarn in which a high-viscosity component is a polytrimethylene terephthalate in which at least 80 mol% of a repeating unit is trimethylene terephthalate. A method for producing a polyester-based composite yarn, characterized in that the yarn is wound around a bobbin package with a tension fluctuation range of 0.4 to 0.1 cN / dtex and a tension fluctuation width of 0.04 cN / dtex or less.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in detail.
[0011]
In the present invention, of the two-component polymer constituting the side-by-side type composite yarn (hereinafter abbreviated as composite yarn), the high-viscosity component is a polytrimethylene terephthalate in which 80 mol% or more of the repeating unit is trimethylene terephthalate. is there. PTT has a crystal structure in which the methylene chain of the alkylene glycol moiety has a gauche-gauche structure (the molecular chain is bent at 90 degrees), and further, the density of constraint points due to the interaction (stacking, parallel) between benzene rings is low. Because of its high flexibility, it has a characteristic stretch property that the molecular chain is easily extended and recovered by the rotation of the methylene group. This is because the stretch property inherent in PTT is sufficiently exhibited even in the composite yarn. In the present invention, the composite ratio of the two components constituting the composite yarn is the composite ratio (volume ratio) used for imparting elasticity, and is in the range of 65:35 to 35:65, preferably 60:40. 40:60.
[0012]
Of the two-component polymer constituting the composite yarn, the low-viscosity component may be polyethylene terephthalate, polybutylene terephthalate, or the like, and low-viscosity polytrimethylene terephthalate may be used. The intrinsic viscosity difference between the two components is preferably at least 0.2 in order to obtain stretchability, and the intrinsic viscosity difference is preferably at most 1.5 in consideration of the stability of the composite.
[0013]
If necessary, one or both of the two components may be combined with isophthalic acid, such as 2-2bis {4- (β-hydroxy) phenyl} propane, unless the object of the present invention is impaired. A polymerization component, a matting agent such as titanium oxide, an antioxidant such as a hindered phenol compound, a pigment, a twist-resistant agent, an antibacterial agent, a deodorant, a conductivity imparting agent, and the like may be blended.
[0014]
In the production method of the present invention, the average winding tension is in a range of 0.04 to 0.1 cN / dtex. When the average winding tension is less than 0.04 cN / dtex, the obtained bobbin package becomes very soft, and the package breaks when the package is taken out, packed, or transported to a higher process. .
[0015]
In the case where the undrawn yarn is once wound and then drawn by a drawing machine to produce a drawn yarn by a so-called two-step method, the yarn after the drawing heat setting is referred to as a wrappet guide as shown in FIG. After passing through the annular guide, it is wound on a bobbin via a traveler. At this time, if the winding is performed with an average winding tension of less than 0.04 cN / dtex, the slipperiness of the traveler becomes very unstable, and the yarn between the wrappet guide and the traveler due to centrifugal force during winding is wound up. Bulging (hereinafter, referred to as ballooning) becomes excessively large, and ballooning yarns come into contact with adjacent bobbin packages or partition plates between weights that partition adjacent bobbin packages, causing thread breakage and fluff.
[0016]
Further, in the case where the undrawn yarn is drawn and wound without being wound once, that is, when the yarn is drawn by the so-called direct spinning drawing method, if the average winding tension is less than 0.04 cN / dtex, the tension between the final roller and the bobbin package is reduced. The running stability of the yarn is reduced, and the yarn cannot be stably wound.
[0017]
In the case where the bobbin package is wound on the bobbin package with an average winding tension exceeding 0.1 cN / dtex, the ballooning becomes too small in the two-step method, and the ballooning thread contacts the upper portion of the bobbin or the traveler causes the ballooning. In the direct spinning and drawing method, the package becomes too hard, which makes it difficult to pay out the package from the winder, and the yarn path guide installed between the final roller and the bobbin. Induces fluff due to scratching.
[0018]
In the manufacturing method of the present invention, the width of the tension fluctuation is 0.04 cN / dtex or less. In the case where the package is formed in a state having a tension fluctuation exceeding 0.04 cN / dtex, in both the two-step method and the direct spinning and drawing method, a variation in the longitudinal crimp of the apparent crimp of the composite yarn occurs, When the composite yarn is used for a woven or knitted fabric, a wrinkle or a wrinkle is generated on a fabric surface, and unevenness in the width of a green fabric is generated.
[0019]
In addition, in the two-step method, the glide is likely to occur because the traveler gliding property becomes unstable. This is because, when the traveling speed of the traveler fluctuates, the yarn between the traveler and the bobbin package repeats tension / relaxation, so that the apparent crimp of the composite yarn is generated, the yarn is caught by the traveler, and the single yarn is cut to generate fluff. It is presumed that.
[0020]
In the case of the direct spin drawing method, the apparent crimp of the composite yarn is similarly caught by the yarn path guide provided between the final roller and the bobbin, and the single yarn is cut to generate fluff.
[0021]
Therefore, in the manufacturing method of the present invention, the average winding tension is 0.04 to 0.1 cN / dtex, preferably 0.05 to 0.08 cN / dtex. Further, the tension fluctuation width is 0.04 cN / dtex or less, preferably 0.02 cN / dtex.
[0022]
With regard to the average winding tension range and the range of tension fluctuation, in the case of yarn production by the two-step method, a traveler having an appropriate weight, the initial rotation speed of the spindle and the stretching speed are carefully selected for the fineness of the composite yarn, and the yarn is produced by the direct spinning and stretching method. Then, it is necessary to carefully select an appropriate relaxation rate between the final roller and the peripheral speed of the package. Furthermore, in any of the yarn making methods, the winding diameter was changed so that the winding tension did not change even if the winding progressed and the package diameter changed, or the tension fluctuation width became 0.04 cN / dtex or less. This can be achieved for the first time by setting the deceleration rate of the spindle rotation speed to an appropriate value.
[0023]
In the yarn production by the two-step method, in order to form a 1.5 kg package in which the composite yarn of 56 decitex and 24 filaments satisfies the average winding tension and the fluctuation range of the tension of the present invention, Kanai Kiko Kogyo Co., Ltd. SB-7 # 32 (weight: 1.49 g / 100 pieces) to # 30 (weight: 2.59 g / 100 pieces), stretching speed: 600 to 800 m / min, spindle initial rotation speed: 8000 to 8700 rpm, winding The final rotation speed of the spindle upon completion of the picking must be carefully selected from the range of 6600 to 7200 rpm (deceleration is performed according to the change in the package diameter).
[0024]
The average winding tension in the present invention refers to the tension immediately before winding the package from 15 minutes after the start of winding the drawn yarn to the package and 1 minute before the end of forming and winding the package every 15 minutes. The average value of the value (cN / dtex) obtained by dividing the measured value (cN) by the drawn yarn fineness. The tensiometer uses a ROTHSCHILD MiniTens R-046. In the two-step method, the yarn just above the wrappet guide is used. In the direct spinning / drawing method, measurement is performed on the yarn between the final roller and the yarn path guide. The tension fluctuation width is a difference (cN / dtex) between the maximum value and the minimum value of the tension measured every 15 minutes.
[0025]
In the present invention, it is important to wind the composite yarn into a bobbin package. In the case of a cheese-like package, a roller called a touch roll as shown in FIG. 4 is provided on the winder to flatten the package surface, and the touch roll takes up the package surface while applying a constant pressure. In this case, since the surface of the package being wound is always in contact with the touch roll from the start of winding to the completion of winding, fluff is generated. Further, there is a drawback that a yarn long spot is easily generated due to friction between the yarn and the surface of the touch roll, and a single yarn tarmi is easily generated. In addition, in the cheese-like package, the package end surface is released from the pressure from the touch roll after the winding is completed or at the stage when the winding is advanced, but at this time, the apparent crimp of the composite yarn is only at the package end. When the yarn is unwound from the package in the weaving and knitting process, the unwound yarn is caught at the end of the package, and the unwound yarn is broken or fluff is generated.
[0026]
The bobbin package of the composite yarn in the present invention is used by weaving with a next bobbin package when weaving a woven fabric using a weft, etc. Since it is extremely important to reduce the frequency of these operations from the viewpoint of cost reduction, the bobbin package is preferably wound with a composite yarn of 1 kg or more, more preferably 1.5 kg. It is more preferably at least 2.0k.
[0027]
In the present invention, a straight line X that passes through the center of a line segment AB connecting two intersections A and B between the tangent of the two-component bonding surface of the yarn cross section of the composite yarn and the outer periphery of the yarn and is orthogonal to the line segment AB When two intersections with the outer periphery are C and D, and two intersections between a straight line Y passing through the center of the line segment CD connecting the intersections C and D and orthogonal to the line segment CD and the yarn outer periphery are E and F. The ratio CD / EF of the length of the line segment CD to the line segment EF is set to 1.2 to 4.0, and preferably 1.5 to 2.0.
[0028]
By setting the CD / EF to 1.2 or more, both polyester components become thicker with respect to the joining surface of the two components in the cross section of the composite yarn, and the crimping property of the composite yarn is sufficiently exhibited to exhibit the stretching performance. I do. Further, when used for a woven or knitted fabric and subjected to crimping by shrinkage treatment, the surface of the woven or knitted fabric has no grain or wrinkles and has excellent surface quality. In addition, it is possible to suppress the bending of the discharge yarn of the melt spinning due to the difference in shear speed caused by the difference in viscosity between the two polyesters, to prevent the yarn breakage attached to the die surface, and to perform stable spinning.
[0029]
On the other hand, by setting the ratio to 5.0 or less, the intensity of reflected light on the surface of the composite yarn is suppressed, the irritability on the surface of the woven or knitted fabric is eliminated, and the quality is improved. Guides that pass at the time of knitting processing, such as entanglement giving guides, lubrication guides, yarn path guides, and knitting needles, can be prevented from shaving, and can improve the yarn forming property and higher passability. This can improve the uniformity in the longitudinal direction.
[0030]
The apparent crimp rate of the composite yarn in the present invention is preferably 20% or more. By setting the apparent crimp rate to 20% or more, the resulting fiber product such as a fabric has high stretchability and a soft texture. It is more preferably at least 25%.
[0031]
In the production method of the present invention, it is preferable to impart entanglement of 5 yarns / m or more to the composite yarn. It not only improves the bobbin package quality but also improves the weaving and knitting process passability, and is more preferably 10 pieces / m or more.
[0032]
【Example】
Hereinafter, an embodiment will be described in detail. The measurement items in the examples of the present invention are as follows.
[0033]
1. Intrinsic viscosity
Using o-chlorophenol as a solvent, it was determined at 25 ° C according to a conventional method.
[0034]
2. Overt crimp rate
Adjust the number of windings so that the total fineness is 3330 dtex, and make a scallop. A load of 5.88 cN (6 g) is applied to the scab and a load of 2.94 cN (300 g) is further applied. The length at this time is defined as L0. Thereafter, the load of 2.94 cN (300 g) was removed, the length after one minute under the load of 5.88 cN (6 g) was L1, and the length was obtained by the following equation.
[0035]
Obvious crimp rate (%) = (L0−L1) / L0 × 100.
[0036]
3. Fineness
It measured by the method of JIS L1090-5-3.
[0037]
4. Strength, elongation
It measured by the method of JIS L1090-5-5-1.
[0038]
5. Number of fluff
Using a Toray Co. fly counter shown in FIG. 2, eight obtained multifilament packages were stored for one week in an atmosphere at a temperature of 26 ° C. and a humidity of 90% immediately after the collection of the packages, and then at a speed of 550 m / min. While unwinding, a yarn length of 30000 m was evaluated as follows based on the measured number of fluff (pieces / million).
[0039]
:: The number of fluff is less than 0.5 pieces / million
Δ: The number of fluff is 0.6 to 2 pieces / 10,000 m.
X: The number of fluff exceeds 3 pieces / 10,000 m.
[0040]
6. High workability
Immediately after the package was collected, it was stored for one month in an atmosphere at a temperature of 26 ° C. and a humidity of 80%, and then, after 645 yarns were wound, a winding speed was 250 m / min, and a beam length was 200,000 m. The evaluation was made based on the number of times the warping machine was stopped, and the passing criteria was determined to be 20 times or less.
[0041]
7. Fabric stretch rate
Weaving in a plain weave structure using a composite yarn obtained as a weft without twisting, using a general 56dtex-18F polyester multifilament round cross-section yarn added to a warp yarn and a twist of 150 T / m. After scouring and hot water treatment at 95 ° C. × 40 minutes, the fabric obtained by air-drying is cut into 5 cm in width and 20 cm in length in the weft direction, one is fixed and suspended, and a 1.8 kg load is applied to the lower end. The elongation L3 (cm) after 30 seconds was measured, and the fabric stretch ratio (%) was determined from the following equation.
[0042]
Fabric stretch rate (%) = {(L3-20) / 20} × 100.
[0043]
8. Fabric quality (1)
The fabric used for the evaluation of the stretchability was cut into a width of 50 cm and a length of 50 cm in the warp direction, and the number of wrinkles and wrinkles on the surface was evaluated as follows.
[0044]
0 to 1: 、, 2 to 5: Δ, 6 or more: X.
[0045]
9. Fabric quality (2)
The fabric used for evaluation of the stretchability was cut into a width of 50 cm and a length of 50 cm in the warp direction, and a sensory evaluation was conducted by 20 panelists. The surface of the fabric was observed under a commercially available 40-watt fluorescent lamp, and evaluated by the number of people who judged that the surface had no irritability.
[0046]
18 or more: ○, 14-17: Δ, 13 or less: ×.
[0047]
Example 1
Using a composite spinning apparatus, a PTT having an intrinsic viscosity of 1.47 and a PET having an intrinsic viscosity of 0.51 were each melted, and a groove-type two-component merging portion having a width of 2.5 mm × length of 5 mm and a width of 0.15 mm were formed at 24 holes. X From a composite spinneret having a slit-type discharge hole with a length of 0.71 mm, the discharge ratio is adjusted so that the volume ratio of PTT and PET in the cross section of the yarn becomes 1: 1 and the spinning temperature is 270 ° C. Issued. Next, the spun yarn was cooled and solidified by an air flow, then an oil agent of 0.8% by weight was applied, and an undrawn yarn of CD / EF = 1.4 was once wound at a speed of 1400 m / min. Next, after preheating at 60 ° C. in the first roll, the film is stretched at a stretch ratio of 3.1 times with the second roll and heat-set at 125 ° C. With a entanglement guide that opens and entangles the yarn with a swirling air flow at an entangling air pressure of 0.15 MPa while giving a relaxation of 4%, the entanglement is applied, and then the wrappet guide and the traveler are passed through a 56 dtex through a traveler. 1.5 kg of a 24-filament composite yarn was wound around a bobbin. FIG. 3 shows a schematic diagram of the two-step method used in this example.
[0048]
At this time, as the traveler, SB-7 # 30 (weight: 2.59 g / 100 pieces) manufactured by Kanai Kiko Kogyo Co., Ltd. was used, the stretching speed was 600 m / min, and the winding speed was advanced from the initial rotation speed of 8000 rpm. The number of revolutions gradually decreased as the package became larger. At this time, the average winding tension was 0.06 cN / dtex, and the fluctuation width of the tension was 0.01 cN / dtex.
[0049]
The obtained composite yarn had a strength of 3.9 cN / dtex, an elongation of 33.5%, a number of entanglements of 8.4 / m, an apparent crimp rate of 31.4%, a number of fluffs of 0.08 / million, and a warp. The number of machine stops was eight, the fabric stretch ratio was 22%, and there was no problem with the physical properties and quality of the original yarn, and the high-order workability was good. In the case of the fabric using the composite yarn, a fabric having both excellent surface quality and stretchability was obtained without any wrinkles, wrinkles or irritations. The results are summarized in Table 1.
[0050]
Example 2
In Example 2, the composite spinning was performed in the same manner as in Example 1, except that the shape of the discharge hole (slit width and slit length) of the composite spinneret was changed so that CD / EF was 4.0. At this time, the average winding tension was 0.07 cN / dtex, and the tension fluctuation width was 0.02 cN / dtex. In addition, the obtained composite yarn had a strength of 3.8 cN / dtex, an elongation of 25%, the number of entanglements of 7.5 / m, the apparent crimp rate of 34.8%, and the number of fluffs of 0.8 / million. Although the elongation was slightly reduced in the physical properties of the original yarn, it had a grade and physical properties that were not problematic for practical use. Needless to say, it had sufficient stretchability, and the number of times the warping machine was stopped was 19 times, but it was at a production level.
[0051]
Example 3
Using the same composite spinneret as in Example 1, the yarn was spun at a spinning temperature of 270 ° C. by adjusting the discharge ratio so that the volume ratio between PTT and PET in the yarn cross section was 1: 1. Next, after the spun yarn is cooled and solidified by an air stream, 0.8% by weight of an oil agent is applied, and the spun yarn is taken up by a first hot roller having a surface temperature of 55 ° C. and a speed of 1050 m / min. Stretching heat setting was performed with a second hot roller at a speed of 4200 m / min. Furthermore, a relaxation rate of 0% is applied between the second hot roller and the first relaxation roller, and a 1% relaxation rate is applied between the first relaxation roller and the second relaxation roller. The entanglement is imparted by an entanglement guide that opens and entangles the yarn with the swirling air flow, and further, a relaxation rate of 1% is imparted between the second relaxing roller and the peripheral speed of the package, and 2.0 kg of the composite yarn is bobbin packaged. Wound up. FIG. 4 shows a schematic diagram of the direct spinning and drawing method used in this example.
[0052]
At this time, the winding progressed so that the bobbin package peripheral speed became constant, and the rotation speed was gradually reduced as the package became larger. At this time, the average winding tension was 0.08 cN / dtex, and the fluctuation width of the tension was 0.02 cN / dtex.
[0053]
The obtained composite yarn had a strength of 3.5 cN / dtex, an elongation of 28%, a number of entanglements of 8.1 / m, an apparent crimp rate of 29.7%, and a number of fluff of 1.0 / million. In the fabric using this, the surface quality is good, the fabric stretch ratio is 21%, and the fabric has a stretch property that is not problematic for a high stretch fabric. The warper was stopped 15 times, which was at a level that could be produced.
[0054]
Example 4
After melting PTT having an intrinsic viscosity of 2.13 as a high-viscosity component and PTT having an intrinsic viscosity of 1.12 as a low-viscosity component, the volume ratio of the high-viscosity PTT and the low-viscosity PTT in the cross section becomes 1: 1. The bobbin package of the composite yarn was obtained in the same manner as in Example 3, except that the discharge ratio was adjusted and the spinning was performed at a spinning temperature of 260 ° C. At this time, the bobbin package peripheral speed was adjusted so that the average winding tension was 0.04 cN / dtex and the tension fluctuation width was 0.01 cN / dtex, and a bobbin package of 1.0 kg of the composite yarn was obtained. The obtained composite yarn had a strength of 2.8 cN / dtex, an elongation of 28%, the number of entanglements of 9.0 / m, the apparent crimp rate of 38.0%, and the number of fluffs of 1.5 / 1,000 m. In the fabric using this, the surface quality is good, the fabric stretch ratio is 31%, and the fabric has excellent stretchability, and the warping machine has been stopped 15 times. It was at a level that could be produced.
[0055]
Example 5
A bobbin package of a composite yarn was obtained in the same manner as in Example 1 except that the traveler was SB-7 # 32 (weight: 1.49 g / 100 pieces) manufactured by Kanai Kiko Kogyo Co., Ltd. At this time, the average winding tension was 0.05 cN / dtex, and the tension fluctuation width was 0.03 cN / dtex.
[0056]
The obtained composite yarn had a strength of 3.8 cN / dtex, an elongation of 34.1%, a confound number of 8.9 pieces / m, an apparent crimp rate of 35.2%, and a fluff number of 0.9 pieces / million. It has the quality and physical properties that are not problematic for practical use. In the fabric using this, the stretch rate is 27%, the surface quality is free of wrinkles and wrinkles, and it has excellent surface quality and stretchability. Things were obtained. The number of stoppages of the warper was 18 times, which was at a level at which production was possible.
[0057]
[Table 1]
Figure 2004131870
[0058]
Comparative Example 1
A bobbin package of a composite yarn was obtained in the same manner as in Example 1, except that the traveler was SB-7 # 25 (weight: 4.54 g / 100 pieces) manufactured by Kanai Kiko Kogyo Co., Ltd. At this time, the average winding tension was 0.17 cN / dtex, and the fluctuation width of the tension was 0.04 cN / dtex. Further, the obtained composite yarn had a strength of 3.4 cN / dtex, an elongation of 31.2%, a number of entanglements of 7.0 / m, an apparent crimp rate of 28.4%, and a number of fluff of 3.1 / 1,000 m. In the fabric using this, the surface quality was free of wrinkles and wrinkles and a feeling of irritability, and there was no problem with the surface quality and stretchability. However, the number of times the warping machine was stopped was 28 times, and it was difficult to actually produce the fabric. Level.
[0059]
Comparative Example 2
A bobbin package of a composite yarn was obtained in the same manner as in Example 1, except that the traveler was SB-7 # 33 (weight: 1.20 g / 100 pieces) manufactured by Kanai Kiko Kogyo Co., Ltd. At this time, the average winding tension was 0.03 cN / dtex, and the fluctuation width of the tension was 0.02 cN / dtex. The obtained composite yarn had a strength of 3.4 cN / dtex, an elongation of 31.2%, the number of entanglements of 8.6 / m, the apparent crimp rate of 28.0%, and the number of fluffs of 4.2 / 1,000 m. In the fabric using this, the surface quality was free from wrinkles and wrinkles and a feeling of irritability, and there was no problem with the surface quality and stretchability, but the number of times the warping machine was stopped was 31 times, and it was difficult to actually produce the fabric. Level.
[0060]
Comparative Example 3
A bobbin package of 2.0 kg of a composite yarn was obtained in the same manner as in Example 3, except that the peripheral speed of the bobbin package was changed so that the average winding tension was 1.7 cN / dtex. In the course of winding, single yarn breakage or yarn breakage occurred with the yarn path guide installed between the final roller and bobbin, but rewinding was performed many times, and a 2 kg package was obtained. The yarn had a strength of 3.5 cN / dtex, an elongation of 27%, an interlacing number of 7.9 / m, an apparent crimp rate of 25.2%, and a fluff number of 6.1 / m. Although the stretch rate was 20%, there was no problem, but the number of times the warping machine was stopped was 41 times, and it was difficult to actually produce.
[0061]
Comparative Example 4
A bobbin package of a composite yarn was obtained in the same manner as in Example 3, except that the peripheral speed of the bobbin package was intentionally changed so that the tension fluctuation width was 0.6 cN / dtex. Single yarn breakage and yarn breakage frequently occurred in the yarn path guide installed between the final roller and the bobbin. The resulting composite yarn had a strength of 3.6 cN / dtex, an elongation of 29%, a number of confounds of 8.2 / m, an apparent crimp rate of 29.0%, and a number of fluffs of 4.6 / m. The stretch rate of the used fabric was 23%, which was no problem. However, the fabric surface was inferior in quality due to occurrence of wrinkles and wrinkles and a portion where the greige shrinkage width was large. In addition, the number of times the warping machine was stopped was 33 times, which was a level that was difficult to actually produce. In addition, as a result of examining the correlation with the winding history for the composite yarn of the fabric surface wrinkles and wrinkles generated portion and the portion where the greige shrinkage width is large, the wrinkles and wrinkles generated portion is the winding tension with respect to the average winding tension, The composite yarn when the fluctuation is 0.06 cN / dtex is higher. In the portion where the greige shrinkage width is larger, the winding tension is changed to 0.06 cN / dtex lower than the average winding tension. It turned out that the composite yarn at the time of this was applicable. Although the detailed mechanism of the change in the wrinkles and wrinkles or the change in the shrinkage width of the greige machine due to the fluctuation of the winding tension has not yet been clarified, the weaving is likely due to a change in the apparent crimping form of the wound composite yarn. It is expected that the unwinding tension at the time fluctuates and the weaving density at the time of greige processing changes.
[0062]
Comparative Example 5
Using the same spinneret and polymer as in Example 1, a 2.0 kg composite yarn cheese-like package was obtained using a cheese-like package winder as shown in FIG. The resulting composite yarn had a strength of 3.5 cN / dtex, an elongation of 27%, a number of entanglements of 8.3 / m, an apparent crimp rate of 29.7%, a number of fluffs of 8.0 / m, and a package surface. In addition, some single yarn tarmi were visually confirmed. Further, during the warping process, an apparent crimp appears at the end of the package, and the unwound yarn is caught at the end of the package. Was caught by the yarn path guide of the warping machine, and the number of times the warping machine was stopped was 51 times, which was difficult for actual production.
[0063]
[Table 2]
Figure 2004131870
[0064]
As described above, according to the present invention, when manufacturing a side-by-side type composite yarn using PTT, the winding tension and the fluctuation of the tension are set in appropriate ranges, and the yarn is wound on a bobbin package. A polyester-based composite yarn exhibiting good quality and high stretchability, free from wrinkles and wrinkles and fluctuations in shrinkage width of a greige machine when used in a fabric without generation of cuts or fluff can be obtained.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing an example of a composite yarn cross-sectional shape according to the present invention.
FIG. 2 is an explanatory diagram showing a method for measuring the number of fluff in the present invention.
FIG. 3 is a schematic diagram showing an example of a two-step method used in the present invention.
FIG. 4 is a schematic view showing an example of a direct spinning drawing method used in the present invention.
FIG. 5 is a schematic view showing an example of a winder used for winding a cheese-like package.
[Explanation of symbols]
1: Package
2: Fluff detector
3: Unwinding device
4: Yarn suction device
5: Fly counter body
6: Spinneret
7: yarn cooling device
8: 1st roll
9: 2nd roll
10: undrawn yarn package
11: 1st hot roller
12: Second hot roller
13: Traveler
14: Traveler sliding rail
15: Weight divider
16: Oiling roller
17: First Relax Roller
18: Second relaxing roller
19: Thread guide
20: Winder for bobbin package
21: Confounding guide
22: Touch roll
23: Cheese-like package

Claims (3)

高粘度成分が、繰り返し単位の80モル%以上がトリメチレンテレフタレートからなるポリトリメチレンテレフタレートであるサイドバイサイド型複合糸を製造するに際し、平均巻き取り張力0.04〜0.1cN/dtex、張力変動幅0.04cN/dtex以下で、ボビンパッケージに巻き取ることを特徴とするポリエステル系複合糸の製造方法。In producing a side-by-side type composite yarn in which the high-viscosity component is polytrimethylene terephthalate in which at least 80 mol% of the repeating unit is trimethylene terephthalate, the average winding tension is 0.04 to 0.1 cN / dtex, and the tension fluctuation width. A method for producing a polyester-based composite yarn, wherein the yarn is wound around a bobbin package at 0.04 cN / dtex or less. サイドバイサイド型複合糸が、該複合糸横断面の2成分の接合面の接線と糸外周との2つの交点A、Bを結んだ線分ABの中心を通り、線分ABと直交した直線Xと糸外周との2つの交点をC、Dとして、交点C、Dを結んだ線分CDの中心を通り、線分CDと直交した直線Yと糸外周との2つの交点をE、Fとしたとき、線分CDと線分EFの長さの比CD/EFを1.2〜4.0とし、且つ顕在捲縮率が20%以上であることを特徴とする請求項1に記載のポリエステル系複合糸の製造方法。The side-by-side type composite yarn passes through the center of a line segment AB connecting two intersections A and B between the tangent of the two-component bonding surface of the composite yarn cross section and the outer periphery of the yarn, and a straight line X orthogonal to the line segment AB. Two intersections with the outer periphery of the yarn are denoted by C and D, and two intersections between a straight line Y passing through the center of the line segment CD connecting the intersections C and D and orthogonal to the line segment CD and the outer periphery of the yarn are denoted by E and F. The polyester according to claim 1, wherein the ratio CD / EF of the length of the line segment CD to the length of the line segment EF is 1.2 to 4.0, and the apparent crimp ratio is 20% or more. A method for producing a composite yarn. サイドバイサイド型複合糸に、5個/m以上の交絡を付与することを特徴とする請求項1または2記載のポリエステル系複合糸の製造方法。The method for producing a polyester-based composite yarn according to claim 1 or 2, wherein confounding of 5 / m or more is imparted to the side-by-side type composite yarn.
JP2002297031A 2002-10-10 2002-10-10 Method for producing polyester-based conjugate fiber Pending JP2004131870A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007046475A1 (en) * 2005-10-20 2007-04-26 Solotex Corporation Cheese-like package of highly crimpable conjugated fiber and process for the production of the same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007046475A1 (en) * 2005-10-20 2007-04-26 Solotex Corporation Cheese-like package of highly crimpable conjugated fiber and process for the production of the same

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