JP4018968B2 - Method for producing extra fine polyester false twisted yarn - Google Patents
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Description
【０００１】
【発明の属する技術分野】
本発明は、製織工程および製編工程において優れた工程通過性を有する極細ポリエステル仮撚加工糸を安定して製造する方法に関する。
【０００２】
【従来の技術】
単糸繊度が１ｄｔｅｘ以下の極細ポリエステル仮撚加工糸は、布帛にした時、柔らかな風合が得られ、保温性、吸水、吸湿性などの性能も向上するため、衣料用途で幅広く使われている。
【０００３】
さらに、上記のような極細ポリエステル仮撚加工糸を製造する方法としては、例えば、特許文献１や特許文献２などが提案されている。しかしながら、こうした従来提案されている製造方法では、単糸数が増え、繊度が細くなるに従い、得られた仮撚加工糸には毛羽や未解撚スポット斑が多発し、染斑などの品質斑も多いといった問題がある。
【０００４】
これに対して、本発明者等は、特願２００２−１８１１３８号により、紡糸口金下加熱を特定の条件として得られた複屈折率が０．０３〜０．０６の未延伸糸を用い、これに仮撚加工糸で測定した交絡度が５０〜９０個／ｍとなるように空気交絡を施した後、延伸同時仮撚加工し、油剤を付与して巻き取り、その際、仮撚加工条件、油剤付着量、巻取張力、巻取速度などを特定の範囲に限定することによって、従来に比べ安定した仮撚加工を行うことができ、毛羽や未解撚スポット斑、染斑など品質斑の少ない極細ポリエステル仮撚加工糸が製造できることを提案した。
【０００５】
一方、かかる極細ポリエステル繊維の分野でも、生産性を向上させるため製織および製編の高速化が進み、これに対応できる仮撚加工糸の市場要求が高くなっている。
【０００６】
しかしながら、上記のような毛羽や未解撚スポット斑が少なく品質が良好な仮撚加工糸においても、これを１２００ｍ／分以上の高速で解舒した際には、風綿が多く発生し、織機の停台回数が急増するといった問題があり、さらなる改善が望まれている。
【０００７】
【特許文献１】
特開平４-１９４０３６号公報
【０００８】
【特許文献２】
特開２００２−３８３４１５号公報
【０００９】
【発明が解決しようとする課題】
本発明は、上記従来技術を背景になされたもので、その目的は、繊度が小さくかつフィラメント数が多いにもかかわらず、毛羽、未解撚スポット斑、染斑が少なく、しかも、高速解舒しても風綿が発生しにくく製織および製編工程での工程通過性に優れた極細ポリエステル仮撚加工糸を安定して製造する方法を提供することにある。
【００１０】
【課題を解決するための手段】
本発明者等は、上記課題を解決するため検討を重ねた結果、延伸同時仮撚加工の前後で空気交絡処理を施し、その際、両方で適正な交絡をバランスよく付与した場合、毛羽、未解撚スポット斑、染斑が少ないだけでなく、高速解舒性にも優れた仮撚加工糸が得られることを見出した。
【００１１】
かくして、本発明によれば、延伸同時仮撚加工法により、単糸繊度が０．５ｄｔｅｘ以下、フィラメント数が１００〜４００本であるポリエステル仮撚加工糸を製造するに際し、延伸同時仮撚加工の前と後で空気交絡処理を施し、後の空気交絡処理前後の交絡数をそれぞれ３０〜６０個／ｍ、７０〜１００個／ｍとすることを特徴とする極細ポリエステル仮撚加工糸の製造方法が提案される。
【００１２】
【発明の実施の形態】
以下本発明の実施形態について詳細に説明する。
本発明は、単糸繊度が０．５ｄｔｅｘ以下、フィラメント数が１００〜４００本であるポリエステル仮撚加工糸を製造する方法である。
【００１３】
本発明でいうポリエステルとは、主たる繰り返し単位がエチレンテレフタレートからなるポリエステルであり、本発明の目的を阻害しない範囲でテレフタル酸成分および／またはエチレングリコール成分以外の成分を少量、具体的にはテレフタル酸成分に対して好ましくは１５モル％以下、より好ましくは５モル％以下共重合したものであってもよい。これらのポリエステルには、公知の添加剤、例えば、顔料、染料、艶消し剤、防汚剤、蛍光増白剤、難燃剤、安定剤、紫外線吸収剤、滑剤等が含まれていてもよい。
【００１４】
本発明に用いるポリエステルの固有粘度（３５℃のオルソ−クロロフェノール溶液を溶媒として測定）は０．４５〜０．７０の範囲が好ましく、より好ましくは０．５５〜０．６７の範囲である。
【００１５】
本発明で用いる未延伸ポリエステルマルチフィラメント糸は、複屈折率が０．０３〜０．０６であることが望ましい。例えば、かかる未延伸ポリエステルマルチフィラメント糸は、口金面から溶融吐出されたポリエステル重合体のポリマー流を２５００〜４０００ｍ／分で引き取ることにより得られる。
【００１６】
本発明においては、例えば図１に示すような工程にて、延伸同時仮撚加工の前と後で空気交絡処理を施し、後の空気交絡処理前後の交絡数をそれぞれ３０〜６０個／ｍ、７０〜１００個／ｍとすることが必要である。
【００１７】
後の空気交絡処理前の交絡数が３０個／ｍ未満となるような交絡を前の空気交絡処理で付与した場合、延伸同時仮撚加工で均一な撚りが付与されず、また均一な延伸を施すことも困難となり、最終的に得られる仮撚加工糸に毛虫状の大きな毛羽や染斑が発生する。また、延伸同時仮撚加工時の断糸も多くなる。上記交絡度が６０個／ｍを越す場合は、延伸同時仮撚加工した糸に、再度、空気交絡を施すことが困難となる。つまり、一度、空気交絡を施した糸に、延伸同時仮撚加工した後、再度空気交絡を施すと、該空気交絡処理で、最初の空気交絡で交絡が形成されていなかった部分、いわゆる非交絡部分に交絡が形成されるが、その際、上記交絡度が６０個／ｍを越す場合は、その糸に、再度どれだけ強く空気交絡処理を施したとしても、巻き取られた仮撚加工糸に十分な交絡を付与することが困難となる。
【００１８】
また、後の空気交絡処理後の交絡数が７０個／ｍ未満の場合は、製織および製編工程の仮撚加工糸の高速解舒で、風綿の発生が多くなり、織機および編機の機台停止回数が多くなるばかりか、織物および編物の製品品位が著しく損なわれる。一方、上記交絡度が１００個／ｍを超える場合は、仮撚加工糸に毛羽が多くなる。また、仮撚加工糸の破断強度、破断伸度が低下する。
【００１９】
本発明においては、上記のように延伸同時仮撚加工の前と後で空気交絡処理を施し、しかも、その際、適度なバランスでそれぞれの交絡を付与することによって、１２００ｍ／分以上という高速解舒でも風綿の発生を抑制でき、製織または製編工程での工程通過性が著しく向上し、しかも、毛羽や未解撚スポット、染色斑が極めて少ない仮撚加工糸を得ることができる。我々の研究によれば、上記のような優れた高速解舒性を有する仮撚加工糸は、延伸同時仮撚加工の前または後のどちらか一方で空気交絡処理を行う製造方法では得られなかった。
【００２０】
なお、上記の延伸同時仮撚加工前後のそれぞれの空気交絡処理は、例えば図１に示すようにインターレースノズル（図１の４及び９）を用いて行うことができる。
【００２１】
本発明において、延伸同時仮撚加工は、延伸仮撚ヒーター内の滞留時間を０．０５〜０．３０ｓｅｃ、好ましくは０．０６〜０．１５ｓｅｃ、該ヒーター出口での糸（走行糸条）の温度を該ポリエステル重合体のガラス転移温度（Ｔｇ）より９０〜１４０℃、好ましくは１１０〜１３０℃高い温度となるようにして行うことが望ましい。また、その際、延伸倍率は１．４〜１．７倍が好ましく、より好ましくは１．５〜１．６倍である。
【００２２】
本発明に用いる延伸仮撚ヒーターとしては、接触式、非接触式のいずれであっても良いが、ヒーター長が１．０〜２．５ｍのものが好ましい。また、延伸同時仮撚加工に用いる仮撚具は、硬度７５〜９５度、厚さ５〜１２ｍｍのウレタンディスクを３軸に配列した摩擦仮撚型ディスクユニットを好ましく用いることができる。該ディスクの回転軸に対し、糸の走行角度が３０〜４５度となるようにして延伸仮撚を施すのが好ましい。また、仮撚数（回／ｍ）を（２５０００〜３５０００）／（仮撚加工糸の繊度（ｄｔｅｘ））1/2となるように仮撚条件を設定すると、毛羽の発生をより低減することができ、好ましい。
【００２３】
さらに、本発明においては、上記の延伸同時仮撚加工をした糸に前述の空気交絡を施した後、該糸の重量を基準として好ましくは１．３〜３．０重量％、より好ましくは１．５〜２．３重量％の油剤を付与し、好ましくは速度５００〜１２００ｍ／分、より好ましくは６００〜１０００ｍ／分で巻き取る（図１の１５）ことによって本発明の仮撚加工糸が得ることができる。また、この際、巻取張力（測定位置：図１の１３）は０．０５〜０．３０ｃＮ／ｄｔｅｘが好ましく、より好ましくは０．１２〜０．２３ｃＮ／ｄｔｅｘである。なお、油剤は図１の１１に示すような、ローラー式あるいは計量ノズル式油剤アプリケーターで付与すれば良い。
【００２４】
仮撚加工糸の物性としては、破断強度が３．０ｃＮ／ｄｔｅｘ以上、破断伸度が１５〜４５％であることが、高速解舒性や、製織性および製編性の点から好ましい。また、仮撚加工糸の全捲縮率が２〜５％、熱水収縮率が２．５〜４．５％であることが、本発明にかかる仮撚加工糸の性能を十分に発揮し嵩高性に優れた織編物が得られる点で好ましい。かかる物性の仮撚加工糸は、本発明の製造方法により容易に得ることができる。
【００２５】
【実施例】
以下、実施例により、本発明を更に具体的に説明する。なお、実施例における各項目は次の方法で測定した。
（１）固有粘度
オルソクロロフェノールを溶媒として使用し３５℃で測定した。
（２）ポリエステル重合体のガラス転移温度（Ｔｇ）
規定量のポリエステル重合体をアルミサンプルパンに封入し、ＤＳＣ測定装置にて、窒素気流下に室温〜１０℃／分の昇温速度で２８０℃まで昇温し、２分間保持した後、直ちに取りだして、窒素雰囲気中で急冷し、ポリマーがアモルファス状態で固まったサンプルパンを作成した。それを再度、上記の条件で昇温し、昇温曲線からガラス転移温度を測定した。
（３）複屈折率
オリンパスＢＨ−２偏光顕微鏡を使用し、コンペンセーター法により単糸のレターデーションと糸径を測定し、複屈折率を計算した。
（４）走行フィラメント糸の温度
帝人エンジニアリング（株）製の非接触走行物温度計（Ｈ−７５０８）を用いて延伸仮撚ヒーター出口の走行フィラメント糸の温度を測定した。
（５）交絡度
ロッシェルド式インターレース測定器を使用して１ｍ当りの交絡数を測定した。この測定を１０回実施し、その平均値で表した。
（６）仮撚加工断糸回数（回数／Ｔｏｎ）
実施例の条件で、延伸仮撚加工機を１週間連続運転し（１０ｋｇ巻未延伸ポリエステル糸パッケージを延伸仮撚加工し、５ｋｇ巻仮撚加工糸パッケージを２個作成する）、人為的あるいは機械的要因に起因する断糸を除き、その間に発生した断糸回数を記録し、（断糸）回数／Ｔｏｎで仮撚加工断糸とした。
（７）破断強度、破断伸度
（株）島津製作所製テンシロン引張試験機を用いて試料長２０ｃｍ、伸長伸度２０％／分の条件で引張試験を行い荷重・伸張曲線をから求めた。
（８）全捲縮率ＴＣ（％）
極細仮撚加工糸に０．０４４ｃＮ／ｄｔｅｘ（５０ｍｇ／デニール）の張力を掛けてカセ枠に巻き取り、約３３００ｄｔｅｘのカセを作る。カセ作成後、カセの一端に０．００１７７ｃＮ／ｄｔｅｘ＋０．１７７ｃＮ／ｄｔｅｘ（２ｍｇ／デニール＋２００ｍｇ／デニール）の荷重を負荷し、１分間経過後の長さＬ０（ｃｍ）を測定する。次いで、０．１７７ｃＮ／ｄｔｅｘ（２００ｍｇ／デニール）の荷重を除去した状態で、１００℃の沸水中にて２０分間処理する。沸水処理後０．００１７７ｃＮ／ｄｔｅｘ（２ｍｇ／デニール）の荷重を除去し、２４時間自由な状態で自然乾燥する。自然乾燥した試料に、再び０．００１７７ｃＮ／ｄｔｅｘ＋０．１７７ｃＮ／ｄｔｅｘ（２ｍｇ／デニール＋２００ｍｇ／デニール）の荷重を負荷し、１分間経過後の長さＬ１（ｃｍ）を測定する。次いで、０．１７７ｃＮ／ｄｔｅｘ（２００ｍｇ／デニール）の荷重を除去し、１分間経過後の長さＬ２を測定し、次の算式で捲縮率を算出した。この測定を１０回実施し、その平均値で表した。
捲縮率ＴＣ（％）＝［（Ｌ１−Ｌ２）／Ｌ０］×１００
（９）熱水収縮率ＦＳ（％）
極細仮撚加工糸に０．０４４ｃＮ／ｄｔｅｘ（５０ｍｇ／デニール）の張力を掛けてカセ枠に巻き取り、約３３００ｄｔｅｘのカセを作る。カセ作成後、カセの一端に０．００１７７ｃＮ／ｄｔｅｘ＋０．１７７ｃＮ／ｄｔｅｘ（２ｍｇ／デニール＋２００ｍｇ／デニール）の荷重を負荷し、１分間経過後の長さＬ０（ｃｍ）を測定する。次いで、０．１７７ｃＮ／ｄｔｅｘ（２００ｍｇ／デニール）の荷重を除去した状態で、１００℃の沸水中にて２０分間処理する。沸水処理後０．００１７７ｃＮ／ｄｔｅｘ（２ｍｇ／デニール）の荷重を除去し、２４時間自由な状態で自然乾燥する。自然乾燥した試料に、再び０．００１７７ｃＮ／ｄｔｅｘ＋０．１７７ｃＮ／ｄｔｅｘ（２ｍｇ／デニール＋２００ｍｇ／デニール）の荷重を負荷し、１分間経過後の長さＬ１（ｃｍ）を測定し、次の算式で熱水収縮率を算出した。この測定を１０回実施し、その平均値で表した。
熱水収縮率ＦＳ（％）＝［（Ｌ０−Ｌ１）／Ｌ０］×１００
（１０）毛羽
東レエンジニアリング（株）製ＤＴ−１０４型毛羽カウンター装置を用いて、仮撚加工糸を５００ｍ／分の速度で２０分間連続測定して発生毛羽数をカウントし、１０4ｍあたりの個数で表記した。
（１１）未解撚スポット
延伸仮撚加工機付属の張力モニターで解撚張力変動を検出し、限界値以上を未解撚スポット発生とし、１０6ｍ当たりの未解撚スポット個数で表記した。
（１２）織機停台回数
（株）トヨタ製ＬＷ５５０織機を用いて、５ｋｇ巻き仮撚加工糸パッケージを解舒速度１，２２４ｍ／分の速度で解舒しつつ、緯糸へ使用することで、１週間連続して製織した。この時、糸導ガイドおよびその周辺に堆積したフィブリル化した繊維屑（風綿）により織機が停台した回数を回数／ｋｇで織機停台回数とした。
（１３）風綿発生
上記織機停台回数試験において、糸導ガイドおよびその周辺に堆積したフィブリル化した繊維屑（風綿）の状態を目視で３段階に格付けした。
レベル１：ほとんど風綿が認められない。
レベル２：散乱した風綿がやや認められる。
レベル３：糸導ガイド上およびその周辺が風綿で白くなっている。
（１４）均染性
仮撚加工糸試料を１２ゲージ丸編機で３０ｃｍ長の筒編みとし、染料（テラシールブルーＧＦＬ）を用い、１００℃、４０ｍｉｎ染色し、均染性を検査員が目視にて下記基準で格付けした。
レベル１：均一に染色されており、染斑がほとんど認められない。
レベル２：縞状の染斑が少し認められる。
レベル３：縞状の斑が一面に認められる。
【００２６】
［実施例１〜３、比較例１〜５］
ガラス転移温度（Ｔｇ）７３℃、固有粘度０．６４で酸化チタンを０．３重量％含有したポリエチレンテレフタレートペレットを１４０℃で５時間乾燥した後、スクリュー式押出機を装備した溶融紡糸設備にて３１５℃に溶融し、紡糸パックで濾過し、直径０．１５ｍｍの円形吐出孔が２８８個穿設された紡糸口金から、吐出量３９ｇ／分で吐出した。次いで、吐出されたポリマー流を、紡糸口金面から３０ｍｍの間の雰囲気が２３０℃に保たれたホットゾーンを通過せしめ、クロスフロー式紡糸筒からの２５℃の冷却風で冷却し、紡糸口金面から４２０ｍｍの位置（集束長）に設置されたメタリングノズル式給油ガイドで油剤を付与しつつ、フィラメント束として集束し、表面速度３０００ｍ／分で回転している１対（２個）のゴデットローラーで引き取り、ワインダーにて巻き取り、複屈折率０．０４５の未延伸ポリエステルマルチフィラメント（１３０ｄｔｅｘ／２８８ｆｉｌａｍｅｎｔ）を得た。
【００２７】
この未延伸ポリエステルマルチフィラメントに、インターレースノズルを用いて空気交絡処理を施し、帝人製機（株）製ＨＴＳ−１５Ｖ延伸仮撚加工機（１．０４ｍの非接触スリットヒーター装備）により、硬度９０度、厚み９ｍｍ、直径５８ｍｍのウレタンディスクを３軸に配列した摩擦仮撚ディスクユニットで、該ディスクの回転軸に対し、糸条の走行角度が４０度となるように糸を走行させ、撚数×仮撚加工糸繊度1/2（ｄｔｅｘ）＝３００００、走行フィラメント糸条温度２０６℃（Ｔｇより１３３℃高い）、ヒーター内滞留時間０．０８９ｓｅｃおよび延伸倍率１．５８の条件で延伸同時仮撚加工を施し、後の空気交絡処理を行わないで巻き取り、この巻き取った糸の交絡数を後の空気交絡処理前の交絡数とした。この交絡数がそれぞれ表１に示した値となるように、延伸同時仮撚加工前のインターレースノズルで吹き付ける圧空量を調整した。さらに、延伸同時仮撚加工後の糸を、図１に示すように連続して、インターレースノズルにより空気交絡処理し、仮撚加工糸仕上げ油剤（主成分：鉱物油９０％）を該糸重量基準で１．８重量％付与し、０．１８ｃＮ／ｄｔｅｘの巻取張力をかけ、７００ｍ／分の速度で巻き取って、極細ポリエステル仮撚加工糸（８３．５ｄｔｅｘ／２８８ｆｉｌａｍｅｎｔ、単糸繊度０．２９ｄｔｅｘ）パッケージを得た。この際、巻き取られた仮撚加工糸の交絡度を、後の空気交絡処理後の交絡数とし、該交絡数がそれぞれ表１に示す値となるようにインターレースノズルで吹き付ける圧空量を調整した。また、このときの仮撚加工断糸回数は各々表１の如くであった。さらに、得られた極細ポリエステル仮撚加工糸の品質を表１にあわせて示す。
【００２８】
【表１】
【発明の効果】
本発明によれば、単糸繊度が０．５ｄｔｅｘ以下、フィラメント数が１００〜４００本といった、繊度が小さくかつフィラメント数が多いにもかかわらず、毛羽、未解撚スポット斑、染斑が少ない極細ポリエステル仮撚加工糸を得ることができる。しかも、本発明の方法で得られた仮撚加工糸は、１２００ｍ／分以上の高速で解舒しても風綿が発生しにくく、優れた製織および製編工程通過性を有している。このため、本発明は、極細ポリエステル仮撚加工糸という高付加価値商品を効率よく、しかも安価に生産する方法を提案するものであり、その工業的価値が極めて高いものである。
【図面の簡単な説明】
【図１】本発明で用いる延伸同時仮撚加工機の一実施態様を示した模式図。
【符号の説明】
１ ：未延伸糸パッケージ
２ ：糸ガイド
３、３’：フィードローラー
４ ：インターレースノズル
５ ：延伸仮撚ヒーター
６ ：冷却プレート
７ ：摩擦仮撚型ディスクユニット
８ ：第１デリベリーローラー
９ ：インターレースノズル
１０ ：第２デリベリーローラー
１１ ：油剤アプリケーター
１２ ：糸導ガイド
１３ ：巻取張力測定位置
１４ ：巻取ローラー
１５ ：延伸仮撚加工糸パッケージ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for stably producing an ultrafine polyester false twisted yarn having excellent process passability in a weaving process and a knitting process.
[0002]
[Prior art]
Ultra fine polyester false twisted yarns with a single yarn fineness of 1 dtex or less can be used in a wide range of apparel applications because they provide a soft texture when used as a fabric and improve performance such as heat retention, water absorption, and moisture absorption. Yes.
[0003]
Furthermore, as a method for producing such an ultrafine polyester false twisted yarn, for example,
[0004]
On the other hand, the present inventors, according to Japanese Patent Application No. 2002-181138, used an undrawn yarn having a birefringence of 0.03 to 0.06 obtained under specific conditions of heating under the spinneret. After the air entanglement is performed so that the entanglement degree measured with the false twisted yarn is 50 to 90 pieces / m, the stretched simultaneous false twist process is performed, and the oil agent is applied and wound up. By limiting the amount of oil agent attached, winding tension, winding speed, etc. to a specific range, it is possible to perform false false twist processing more stable than before, and quality spots such as fluff, untwisted spot spots, and stain spots. It was proposed that an ultra-fine polyester false twisted yarn with a low content could be produced.
[0005]
On the other hand, in the field of such ultra-fine polyester fibers, the speed of weaving and knitting advances in order to improve productivity, and the market demand for false twisted yarn that can cope with this has increased.
[0006]
However, even in the false twisted yarn having good quality with few fluff and untwisted spot spots as described above, when this is unwound at a high speed of 1200 m / min or more, a lot of fluff is generated, and the loom There is a problem that the number of stops will increase rapidly, and further improvement is desired.
[0007]
[Patent Document 1]
Japanese Patent Laid-Open No. 4-194036
[Patent Document 2]
JP 2002-383415 A [0009]
[Problems to be solved by the invention]
The present invention has been made against the background of the above-described prior art, and its purpose is to reduce fuzz, untwisted spot spots, and dye spots even though the fineness is small and the number of filaments is large. Even so, an object of the present invention is to provide a method for stably producing an ultra-fine polyester false twisted yarn that is less likely to generate fluff and has excellent processability in weaving and knitting processes.
[0010]
[Means for Solving the Problems]
As a result of repeated studies to solve the above-mentioned problems, the present inventors performed air entanglement treatment before and after the simultaneous simultaneous false twisting process, and when appropriate entanglement is imparted in a balanced manner on both sides, It has been found that false twisted yarns with not only few untwisting spots and dyeing spots but also excellent high-speed unwinding properties can be obtained.
[0011]
Thus, according to the present invention, when a polyester false twisted yarn having a single yarn fineness of 0.5 dtex or less and a filament number of 100 to 400 is produced by a drawing simultaneous false twisting method, A method for producing an ultrafine polyester false twisted yarn, characterized in that before and after air entanglement treatment, the number of entanglement before and after the subsequent air entanglement treatment is 30 to 60 pieces / m and 70 to 100 pieces / m, respectively. Is proposed.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail.
The present invention is a method for producing a polyester false twisted yarn having a single yarn fineness of 0.5 dtex or less and a filament number of 100 to 400.
[0013]
The polyester referred to in the present invention is a polyester whose main repeating unit is ethylene terephthalate, and a small amount of components other than the terephthalic acid component and / or the ethylene glycol component, specifically, terephthalic acid, as long as the object of the present invention is not impaired. The copolymer may preferably be a copolymer of 15 mol% or less, more preferably 5 mol% or less. These polyesters may contain known additives such as pigments, dyes, matting agents, antifouling agents, fluorescent whitening agents, flame retardants, stabilizers, ultraviolet absorbers, lubricants and the like.
[0014]
The intrinsic viscosity (measured using a 35 ° C. ortho-chlorophenol solution as a solvent) of the polyester used in the present invention is preferably in the range of 0.45 to 0.70, more preferably in the range of 0.55 to 0.67.
[0015]
The unstretched polyester multifilament yarn used in the present invention preferably has a birefringence of 0.03 to 0.06. For example, such an unstretched polyester multifilament yarn can be obtained by drawing a polymer stream of a polyester polymer melt-discharged from the die surface at 2500 to 4000 m / min.
[0016]
In the present invention, for example, in the process as shown in FIG. 1, the air entanglement process is performed before and after the simultaneous false twisting process, and the number of entanglements before and after the subsequent air entanglement process is 30 to 60 pieces / m, It is necessary to set it as 70-100 piece / m.
[0017]
When entanglement such that the number of entanglements before the subsequent air entanglement treatment is less than 30 / m is imparted by the previous air entanglement treatment, uniform twisting is not imparted by the simultaneous false twisting process, and uniform stretching is performed. It is also difficult to apply, and large caterpillar-like fluff and dye spots are generated on the false twisted yarn finally obtained. Moreover, the yarn breakage during the simultaneous simultaneous false twisting increases. When the degree of entanglement exceeds 60 pieces / m, it is difficult to air entangle again the yarn subjected to simultaneous false twisting. In other words, once the air entangled yarn is subjected to simultaneous false twisting and then subjected to air entanglement again, the portion where no entanglement was formed in the first air entanglement in the air entanglement process, so-called non-entanglement When the entanglement degree exceeds 60 / m at that time, the false twisted yarn wound up, no matter how strong the air entanglement treatment is applied to the yarn again It is difficult to give sufficient confounding to
[0018]
Moreover, when the number of entanglements after the subsequent air entanglement treatment is less than 70 / m, the occurrence of fluffing is increased due to high-speed unwinding of false twisted yarns in the weaving and knitting processes, and Not only will the machine stand stop count increase, but the quality of the woven and knitted products will be significantly impaired. On the other hand, when the said entanglement degree exceeds 100 piece / m, a fuzz increases in false twisted yarn. Further, the breaking strength and breaking elongation of the false twisted yarn are lowered.
[0019]
In the present invention, the air entanglement treatment is performed before and after the simultaneous simultaneous false twisting as described above, and at that time, each entanglement is imparted with an appropriate balance, so that a high-speed solution of 1200 m / min or more is obtained. It is possible to suppress the occurrence of fluff even with a cocoon, significantly improve the process passability in the weaving or knitting process, and obtain a false twisted yarn with very little fuzz, untwisted spots, and stained spots. According to our research, false twisted yarn with excellent high-speed unwinding properties as described above cannot be obtained by a manufacturing method in which air entanglement treatment is performed either before or after simultaneous drawing false twisting. It was.
[0020]
In addition, each air entanglement process before and behind said extending | stretching simultaneous false twist process can be performed using an interlace nozzle (4 and 9 of FIG. 1) as shown, for example in FIG.
[0021]
In the present invention, the drawing simultaneous false twisting is carried out in a drawing false twisting heater having a residence time of 0.05 to 0.30 sec, preferably 0.06 to 0.15 sec, and the yarn (running yarn) at the heater outlet. It is desirable that the temperature is 90 to 140 ° C., preferably 110 to 130 ° C. higher than the glass transition temperature (Tg) of the polyester polymer. At that time, the draw ratio is preferably 1.4 to 1.7 times, more preferably 1.5 to 1.6 times.
[0022]
The drawing false twist heater used in the present invention may be either a contact type or a non-contact type, but preferably has a heater length of 1.0 to 2.5 m. In addition, as a false twisting tool used for simultaneous drawing false twisting, a friction false twist type disk unit in which urethane disks having a hardness of 75 to 95 degrees and a thickness of 5 to 12 mm are arranged in three axes can be preferably used. It is preferable to perform drawing false twist so that the running angle of the yarn is 30 to 45 degrees with respect to the rotational axis of the disk. Moreover, if false twisting conditions are set so that the number of false twists (times / m) is (25000-35000) / (fineness of false twisted yarn (dtex)) 1/2 , generation of fluff is further reduced. This is preferable.
[0023]
Further, in the present invention, after the above-described air entanglement is performed on the yarn subjected to the simultaneous drawing false twisting, preferably 1.3 to 3.0% by weight, more preferably 1 based on the weight of the yarn. The false twisted yarn of the present invention is applied by applying an oil agent of .5 to 2.3% by weight and winding it at a speed of preferably 500 to 1200 m / min, more preferably 600 to 1000 m / min (15 in FIG. 1). Obtainable. At this time, the winding tension (measurement position: 13 in FIG. 1) is preferably 0.05 to 0.30 cN / dtex, more preferably 0.12 to 0.23 cN / dtex. In addition, what is necessary is just to give an oil agent with a roller type or a measurement nozzle type oil agent applicator as shown in 11 of FIG.
[0024]
The physical properties of the false twisted yarn are preferably a breaking strength of 3.0 cN / dtex or more and a breaking elongation of 15 to 45% from the viewpoints of high-speed unwinding property, weaving property and knitting property. Further, the false crimped yarn has a total crimp rate of 2 to 5% and a hot water shrinkage of 2.5 to 4.5%, which sufficiently exhibits the performance of the false twisted yarn according to the present invention. It is preferable at the point from which the woven / knitted fabric excellent in bulkiness is obtained. Such a false twisted yarn having physical properties can be easily obtained by the production method of the present invention.
[0025]
【Example】
Hereinafter, the present invention will be described more specifically with reference to examples. In addition, each item in an Example was measured with the following method.
(1) Intrinsic viscosity Measured at 35 ° C. using orthochlorophenol as a solvent.
(2) Glass transition temperature (Tg) of polyester polymer
A specified amount of polyester polymer is sealed in an aluminum sample pan, heated to 280 ° C. at a heating rate of room temperature to 10 ° C./min under a nitrogen stream in a DSC measuring device, held for 2 minutes, and then immediately removed. The sample pan was rapidly cooled in a nitrogen atmosphere and the polymer solidified in an amorphous state. The temperature was raised again under the above conditions, and the glass transition temperature was measured from the temperature rise curve.
(3) Birefringence Using an Olympus BH-2 polarizing microscope, the retardation and yarn diameter of a single yarn were measured by the compensator method, and the birefringence was calculated.
(4) Temperature of running filament yarn The temperature of the running filament yarn at the outlet of the drawn false twist heater was measured using a non-contact running object thermometer (H-7508) manufactured by Teijin Engineering.
(5) Entanglement degree The number of entanglements per meter was measured using a Rochelle interlace measuring instrument. This measurement was performed 10 times and expressed as an average value.
(6) Number of false twisting cuts (number of times / Ton)
Under the conditions of the examples, the drawn false twisting machine was operated continuously for one week (drawing false twisting of a 10 kg unrolled polyester yarn package to produce two 5 kg wound false twisted yarn packages). The number of yarn breaks that occurred during that time was recorded, and false twisted yarns were cut at (number of yarn breaks) / Ton.
(7) Tensile strength and elongation at break Using a Tensilon tensile tester manufactured by Shimadzu Corporation, a tensile test was performed under the conditions of a sample length of 20 cm and an elongation of elongation of 20% / min, and the load / elongation curve was obtained.
(8) Total crimp rate TC (%)
The extra fine false twisted yarn is applied with a tension of 0.044 cN / dtex (50 mg / denier) and wound on a cassette frame to make a casket of about 3300 dtex. After forming the case, a load of 0.00177 cN / dtex + 0.177 cN / dtex (2 mg / denier + 200 mg / denier) is applied to one end of the case, and the length L0 (cm) after 1 minute is measured. Subsequently, it is treated in boiling water at 100 ° C. for 20 minutes with the load of 0.177 cN / dtex (200 mg / denier) removed. After the boiling water treatment, the load of 0.00177 cN / dtex (2 mg / denier) is removed, and it is naturally dried in a free state for 24 hours. A load of 0.00177 cN / dtex + 0.177 cN / dtex (2 mg / denier + 200 mg / denier) is again applied to the air-dried sample, and the length L1 (cm) after 1 minute is measured. Next, the load of 0.177 cN / dtex (200 mg / denier) was removed, the length L2 after 1 minute was measured, and the crimp rate was calculated by the following formula. This measurement was performed 10 times and expressed as an average value.
Crimp rate TC (%) = [(L1-L2) / L0] × 100
(9) Hot water shrinkage FS (%)
The extra fine false twisted yarn is applied with a tension of 0.044 cN / dtex (50 mg / denier) and wound on a cassette frame to make a casket of about 3300 dtex. After forming the case, a load of 0.00177 cN / dtex + 0.177 cN / dtex (2 mg / denier + 200 mg / denier) is applied to one end of the case, and the length L0 (cm) after 1 minute is measured. Subsequently, it is treated in boiling water at 100 ° C. for 20 minutes with the load of 0.177 cN / dtex (200 mg / denier) removed. After the boiling water treatment, the load of 0.00177 cN / dtex (2 mg / denier) is removed, and it is naturally dried in a free state for 24 hours. A load of 0.00177 cN / dtex + 0.177 cN / dtex (2 mg / denier + 200 mg / denier) was again applied to the air-dried sample, and the length L1 (cm) after 1 minute was measured. Water shrinkage was calculated. This measurement was performed 10 times and expressed as an average value.
Hot water shrinkage FS (%) = [(L0−L1) / L0] × 100
(10) fluff with Toray Engineering Co. DT-104 type fluff counter device, a false twisted yarn with 20 minutes continuous measurement at 500 meters / min to count the occurrence fluff number, the per 10 4 m Expressed in number.
(11) Untwisted spot drawing The untwisted tension fluctuation was detected by a tension monitor attached to the false twisting machine, and the untwisted spot was generated above the limit value and expressed as the number of untwisted spots per 10 6 m.
(12) Number of times of loom stoppage Using a LW550 loom manufactured by Toyota Co., Ltd., using a weft yarn while unwinding a 5 kg false twisted yarn package at a unwinding speed of 1,224 m / min. Weaved continuously for a week. At this time, the number of times that the loom was stopped by the yarn guide and the fibrillated fiber waste (wind cotton) deposited around the yarn guide was defined as the number of times the loom stopped.
(13) Generation of cotton wool In the above-mentioned loom stop frequency test, the state of the fibrillated fiber scrap (cotton) deposited around the yarn guide and its periphery was visually rated in three stages.
Level 1: Almost no fluff is observed.
Level 2: Slightly scattered cotton is observed.
Level 3: The yarn guide guide and its periphery are white with cotton.
(14) Level dyeing false twisted yarn sample is made into a 30 cm long tube knitting with a 12 gauge circular knitting machine, dyed with Terrane Blue GFL at 100 ° C. for 40 minutes, and the leveling property is visually checked by an inspector. Was rated according to the following criteria.
Level 1: Uniformly dyed and scars are hardly observed.
Level 2: Striped spots are slightly observed.
Level 3: Striped spots are observed on one side.
[0026]
[Examples 1 to 3, Comparative Examples 1 to 5]
Polyethylene terephthalate pellets having a glass transition temperature (Tg) of 73 ° C. and an intrinsic viscosity of 0.64 and containing 0.3% by weight of titanium oxide were dried at 140 ° C. for 5 hours, and then melt melt spinning equipment equipped with a screw type extruder. It was melted at 315 ° C., filtered through a spinning pack, and discharged at a discharge rate of 39 g / min from a spinneret having 288 circular discharge holes with a diameter of 0.15 mm. Next, the discharged polymer stream is allowed to pass through a hot zone in which the atmosphere between the spinneret surface and 30 mm is maintained at 230 ° C., and is cooled with the cooling air of 25 ° C. from the cross-flow type spinning cylinder. A pair of (two) godets that are focused as filament bundles and rotated at a surface speed of 3000 m / min while applying an oil agent with a metering nozzle type oiling guide installed at a position (focusing length) 420 mm from It was taken up with a roller and wound up with a winder to obtain an unstretched polyester multifilament (130 dtex / 288 filament) having a birefringence of 0.045.
[0027]
This unstretched polyester multifilament is subjected to an air entanglement process using an interlace nozzle, and a hardness of 90 degrees is obtained by an HTS-15V stretch false twisting machine (equipped with a 1.04 m non-contact slit heater) manufactured by Teijin Seiki Co., Ltd. A friction false twist disc unit in which urethane discs having a thickness of 9 mm and a diameter of 58 mm are arranged in three axes. The yarn is run so that the running angle of the yarn is 40 degrees with respect to the rotation axis of the disc, and the number of twists × False twisting yarn fineness 1/2 (dtex) = 30000, running filament yarn temperature 206 ° C. (133 ° C. higher than Tg), heater residence time 0.089 sec and draw ratio 1.58 Was wound without performing the subsequent air entanglement treatment, and the number of entanglement of the wound yarn was taken as the number of entanglement before the subsequent air entanglement treatment. The amount of compressed air blown by the interlace nozzle before the simultaneous stretching false twisting was adjusted so that the number of entanglements would be the value shown in Table 1, respectively. Further, as shown in FIG. 1, the yarn after the simultaneous simultaneous false twisting is subjected to air entanglement treatment with an interlace nozzle, and false twisted yarn finishing oil (main component: mineral oil 90%) is used as a basis for the weight of the yarn. 1.8% by weight, applied with a winding tension of 0.18 cN / dtex, wound up at a speed of 700 m / min, and subjected to ultra fine polyester false twisted yarn (83.5 dtex / 288 filament, single yarn fineness 0.29 dtex). ) Got the package. At this time, the degree of entanglement of the wound false twisted yarn was taken as the number of entanglements after the subsequent air entanglement treatment, and the amount of compressed air blown by the interlace nozzle was adjusted so that the number of entanglement became the values shown in Table 1, respectively. . Further, the number of false twisting yarn breaks at this time was as shown in Table 1, respectively. Furthermore, Table 1 shows the quality of the obtained ultrafine polyester false twisted yarn.
[0028]
[Table 1]
【The invention's effect】
According to the present invention, the single yarn fineness is 0.5 dtex or less, and the number of filaments is 100 to 400. Even though the fineness is small and the number of filaments is large, the fluff, untwisted spot spots, and stains are extremely small. A polyester false twisted yarn can be obtained. Moreover, even if the false twisted yarn obtained by the method of the present invention is unwound at a high speed of 1200 m / min or more, it is difficult to generate fluff and has excellent weaving and knitting process passability. For this reason, the present invention proposes a method for efficiently and inexpensively producing a high value-added product called ultrafine polyester false twisted yarn, and its industrial value is extremely high.
[Brief description of the drawings]
FIG. 1 is a schematic view showing one embodiment of a drawing simultaneous false twisting machine used in the present invention.
[Explanation of symbols]
1: undrawn yarn package 2:
Claims (3)
Priority Applications (12)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002320962A JP4018968B2 (en) | 2002-11-05 | 2002-11-05 | Method for producing extra fine polyester false twisted yarn |
| TW092109615A TWI294926B (en) | 2002-04-25 | 2003-04-24 | Polyester fine false twisting textured yarn, and methods for producing the same |
| EP03719207A EP1498520B1 (en) | 2002-04-25 | 2003-04-25 | Method for producing polyester extra fine false twist textured yarn and polyester extra-fine false twist textured yarn |
| US10/505,525 US7078096B2 (en) | 2002-04-25 | 2003-04-25 | Method for producing polyester extra fine multi-filament yarn and polyester extra fine false twist textured yarn, polyester extra fine multi-filament yarn, and polyester extra-fine false twist textured yarn |
| MXPA04007453A MXPA04007453A (en) | 2002-04-25 | 2003-04-25 | Method for producing polyester extra fine multi-filament yarn and polyester extra fine false twist textured yarn, polyester extra fine multi-filament yarn, and polyester extra-fine false twist textured yarn. |
| AT03719207T ATE529546T1 (en) | 2002-04-25 | 2003-04-25 | METHOD FOR PRODUCING EXTRA-FINE FALSE-WIRE-TEXTURED POLYESTER YARN, AND EXTRA-FINE FALSE-WIRE-TEXTURED POLYESTER YARN |
| KR1020047013522A KR100984991B1 (en) | 2002-04-25 | 2003-04-25 | Method for producing polyester extra fine multi-filament yarn and polyester extra fine false twist textured yarn, polyester extra fine multi-filament yarn, and polyester extra-fine false twist textured yarn |
| CNB038091739A CN1320179C (en) | 2002-04-25 | 2003-04-25 | Method for producing polyester extra fine multi-filament yarn and polyester extra fine false twist textured yarn, polyester extra fine multi-filament yarn, and polyester extra-fine false twist texture |
| CA2478286A CA2478286C (en) | 2002-04-25 | 2003-04-25 | Process for producing polyester fine multifilament yarn and polyester fine false-twist textured yarn, polyester fine multifilament yarn and polyester fine false-twist textured yarn |
| ES03719207T ES2374667T3 (en) | 2002-04-25 | 2003-04-25 | PROCEDURE FOR THE PRODUCTION OF TEXTURED THREAD BY FALSE EXTRA FINE POLISHESTER AND TEXTURED THREAD BY FALSE EXTRA FINE TORSION OF POLYESTER. |
| PCT/JP2003/005360 WO2003091485A1 (en) | 2002-04-25 | 2003-04-25 | Method for producing polyester extra fine multi-filament yarn and polyester extra fine false twist textured yarn, polyester extra fine multi-filament yarn, and polyester extra-fine false twist textured yarn |
| AU2003235816A AU2003235816A1 (en) | 2002-04-25 | 2003-04-25 | Method for producing polyester extra fine multi-filament yarn and polyester extra fine false twist textured yarn, polyester extra fine multi-filament yarn, and polyester extra-fine false twist textured yarn |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002320962A JP4018968B2 (en) | 2002-11-05 | 2002-11-05 | Method for producing extra fine polyester false twisted yarn |
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| Publication Number | Publication Date |
|---|---|
| JP2004156159A JP2004156159A (en) | 2004-06-03 |
| JP4018968B2 true JP4018968B2 (en) | 2007-12-05 |
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| JP2002320962A Expired - Fee Related JP4018968B2 (en) | 2002-04-25 | 2002-11-05 | Method for producing extra fine polyester false twisted yarn |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2006002309A (en) * | 2004-06-21 | 2006-01-05 | Teijin Fibers Ltd | Ultrafine polyester false-twist crimped textured yarn, method for producing the same and woven or knit fabric |
| JP4995523B2 (en) * | 2006-09-25 | 2012-08-08 | 帝人ファイバー株式会社 | False twisted yarn and method for producing the same |
| JP2009249793A (en) * | 2008-04-10 | 2009-10-29 | Teijin Fibers Ltd | Fabric for car sheet |
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