JP3736298B2

JP3736298B2 - Blended yarn

Info

Publication number: JP3736298B2
Application number: JP2000171603A
Authority: JP
Inventors: 隆志越智; 正幸佐藤; 明木代
Original assignee: Toray Industries Inc
Current assignee: Toray Industries Inc
Priority date: 1998-02-05
Filing date: 2000-06-08
Publication date: 2006-01-18
Anticipated expiration: 2018-02-05
Also published as: JPH11222745A; JP2001003234A

Description

【０００１】
【発明の属する技術分野】
本発明はふくらみ、ソフト、反発感に優れた異収縮混繊糸あるいは仮撚加工糸を極めて簡略な工程で製造するための原料となる混繊糸に関するものである。
【０００２】
【従来の技術】
ポリエステルは機械的特性をはじめ様々な優れた特性を有しているため衣料用途をはじめ各種分野に利用されている。衣料用途では天然繊維をターゲットとして品質の改良が行われてきているが、特にふくらみ、ソフト感のある風合いの実現のための手段として、熱による収縮特性の異なる糸を混繊する、いわゆる収縮差混繊糸が広く用いられている。
【０００３】
収縮差混繊糸の低コスト製造方法として、紡糸／巻き取り段階で低収縮糸と高収縮糸を混繊する紡糸混繊法が採用されていた。例えば、特開平２−１９５２８号公報には低収縮成分としてホモポリエチレンテレフタレート、高収縮成分としてイソフタル酸（以下ＩＰＡと略す）と２・２ビス｛４−（２−ヒドロキシエトキシ）フェニル｝プロパン（以下ＢＨＰＰと略す）を共重合したポリエステルを使用して混繊紡糸を行い、未延伸糸を一旦巻き取った後延伸するという非常に簡略な収縮差混繊糸の製造方法が開示されている。
【０００４】
一方、最近、熱により伸長性を示す、いわゆる自発伸長糸を用いた収縮差混繊糸が注目を集めている。このタイプの収縮差混繊糸を用いれば織物組織の密度が増しても十分な糸長差を染色加工後に得ることができ、特開平２−１９５２８号公報記載の収縮差混繊糸を使用した場合に比べ、ふくらみ、ソフト感に優れた布帛を得ることができるのである。
【０００５】
自発伸長糸の製造方法は、例えば特開平４−３５２８３６号公報にポリエステル部分配向糸（以下ＰＯＹと略す）を一旦延伸した後弛緩熱処理する方法、特開平２−２９３４１０号公報にＰＯＹをそのまま弛緩熱処理する方法等が開示されている。そして、この自発伸長糸を別途製造した収縮糸と後で混繊する（以下、後混繊法と略す）ことにより収縮差混繊糸を得ている。
【０００６】
このように、自発伸長糸の製造には弛緩熱処理が必須であるため、自発伸長糸と収縮糸を別々に製造し、後混繊することが一般的であった。このため、自発伸長糸と収縮糸、すなわち少なくとも２種類の糸を別工程で製造するため、それだけでコストアップとなってしまう。さらに、後混繊のための費用もかさむため、紡糸混繊法に比べコスト面で大きく劣るものであった。
【０００７】
【発明が解決しようとする課題】
本発明は、簡略な工程により自発伸長糸を利用した収縮差混繊糸の製造を可能とするための原料となる混繊糸を提供するものである。
【０００８】
【発明が解決するための手段】
上記目的は、低伸度糸と高伸度糸からなる混繊糸であって、低伸度糸がポリエステルから構成され、高伸度糸が鞘部にポリエステルが配され、芯部に鞘部ポリエステルよりも伸長粘度の温度依存性が高いポリマーとしてポリスチレン系ポリマー、またはポリメタクリレート系ポリマー、またはポリメチルペンテン系ポリマーから選ばれる１種のポリマーが配された芯鞘複合糸で構成されていることを特徴とする混繊糸により達成される。
【０００９】
【発明の実施の形態】
本発明でいうポリエステルとはポリエチレンテレフタレート（以下ＰＥＴと略す）、ポリプロピレンテレフタレート、ポリブチレンテレフタレート等が挙げられるが、ＰＥＴが最も汎用的であり好ましい。また、ジオール成分および酸成分の一部が各々１５ｍｏｌ％以下の範囲で他の共重合可能な成分で置換されたものであってもよい。また、これらは他ポリマ、艶消剤、難燃剤、帯電防止剤、顔料などの添加物を含有していてもよい。
【００１０】
以下、ＰＥＴを例として説明する。
【００１１】
本発明は、簡略な工程により自発伸長糸を含む収縮差混繊糸を得るための原料となる混繊糸に関するものであるが、ある特定の混繊糸を延伸・熱処理するだけの簡略な工程で自発伸長糸を含む収縮差混繊糸が得られる。そして、その原料混繊糸では、低伸度糸と高伸度糸からなる混繊糸であることが特に重要である。このような伸度差混繊糸を用いると、高伸度糸に対しては低倍率延伸、低伸度糸に対しては高倍率延伸となり、実効延伸倍率が異なる混繊糸を得ることができるのである。そして、低倍率延伸側の高伸度糸は自発伸長糸、高倍率延伸側の低伸度糸は収縮糸とすることが可能となるのである。そして、このためには高伸度糸と低伸度糸の伸度差が８０％以上であることが好ましい。伸度差は８０％以上であると、自発伸長糸と収縮糸の収縮率差が大きくなり、布帛にした際のふくらみ感、ソフト感、反発感が向上し好ましい。伸度差は好ましくは１００％以上である。
【００１２】
また、高伸度糸は、鞘部にポリエステルが配され（鞘ポリエステル）、芯部に鞘部ポリエステルよりも伸長粘度の温度依存性が高いポリマ（芯ポリマー）としてポリスチレン系ポリマー、またはポリメタクリレート系ポリマー、またはポリメチルペンテン系ポリマーから選ばれる１種のポリマーが配された芯鞘複合糸であることが重要である。ここで、芯ポリマーは糸の配向を抑制し、高伸度化する作用を有するものであり、その選定方法は特開平９−１７６９２０号公報に記載されている。また、コスト、紡糸性の点からポリスチレン系ポリマーが最も好ましい。その複合比は２〜５重量％とすると充分な高伸度化効果が得られ、また糸切れ無く安定に紡糸することができ、好ましい。そして、芯ポリマーを糸の芯部に閉じこめ糸表面をＰＥＴとすることにより、耐熱性を確保し、延伸や仮撚時の工程安定性を向上することができ、また布帛を染色した際にも、くすみや染色斑を発生することなく美しい染色が可能となるのである。
【００１３】
また、低伸度糸はポリエステルから形成されていることが重要であるが、これにより、混繊糸としての機械的強度を確保することができるのである。また、低伸度糸を構成するポリマーが高伸度糸の鞘部を形成する鞘ポリエステルよりも高収縮性ポリマーとすると収縮差混繊糸とした時の収縮率差が拡大し、布帛のふくらみ感を向上させることができ好ましい。高収縮ポリエステルとしてはＩＰＡを共重合したポリエステルを採用することが好ましい。ＩＰＡの共重合率は３〜１２ｍｏｌ％であれば充分高収縮性の繊維を得ることができる。また、ＩＰＡに加えてＢＨＰＰ等を共重合し、より高収縮化することも可能である。
【００１４】
本発明の混繊糸を用いると、従来の弛緩熱処理−後混繊に比べ、延伸・熱処理という簡略化した工程のみで低伸度糸を自発伸長糸とした収縮差混繊糸が得られるという大きな利点がある。これにより、大幅な低コスト化が可能となるのである。
【００１５】
本発明の混繊糸を延伸・熱処理するだけで低伸度糸を自発伸長糸とできる理由は明らかでないが、特定の芯ポリマーの作用により自発伸長に適した特殊な繊維構造を形成するためであると考えられる。例えば紡糸過程で芯ポリマーと鞘ポリエステルの粘度挙動の違いにより鞘ポリエステル中に超微細な結晶核を生成し、これが自発伸長に有利な繊維構造の前駆体となっている可能性が考えられる。
【００１６】
本発明の混繊糸の製造方法は、何等制限されるものではないが、例えば以下の方法が挙げられる。すなわち、高伸度糸が、ポリエステルを鞘部に、該ポリエステルよりも伸長粘度の温度依存性が高いポリマーとしてポリスチレン系ポリマー、またはポリメタクリレート系ポリマー、またはポリメチルペンテン系ポリマーから選ばれる１種のポリマーを芯部に配した芯鞘複合糸であって、低伸度糸がポリエステル単独糸である２種類以上の糸条を、同一口金から吐出し、糸が冷却固化した後、繊維用油剤、交絡を付与し、２５００ｍ／分以上の紡糸速度で引き取ることにより得ることができる。
【００１７】
本発明では糸断面形状は特に限定されるものではないが、三葉断面や四角断面、または多葉断面形状等の異形断面形状とするとドライタッチとすることができる。単糸繊度範囲についても特に限定はないが、延伸・熱処理後に高伸度糸は０．５〜６．０ｄｔｅｘ、低伸度糸は２．０〜６．０ｄｔｅｘとなるように定めることが好ましい。また、ブラウス等の薄地衣料に用いる場合には、混繊糸のトータル繊度は、延伸・熱処理後に３０〜１１０ｄｔｅｘとなるように定めることが好ましい。さらに、高伸度糸と低伸度糸の混繊割合は繊度比で１０／９０〜９０／１０とすることが好ましい。
【００１８】
また、本発明の混繊糸は延伸・熱処理し収縮差混繊糸とする他、延伸仮撚加工を施し、糸長差によりふくらみ感の優れた仮撚加工糸として用いることもできる。通常、このような伸度差仮撚加工糸は、高伸度糸と低伸度糸を別々に準備しておき混繊後仮撚加工する複合仮撚法が使用されるが、高伸度糸と低伸度糸を別々に製糸し、混繊後仮撚するため工程が煩雑となる。さらに、これには１錘の仮撚加工機に対して２つのクリールが準備されているダブルクリール仮撚加工機が必要となり、装置にも制約が生じる。しかし、本発明の混繊糸を用いると、通常のシングルクリール仮撚加工機で普通に延伸仮撚するだけで複合仮撚加工糸のようにふくらみ感に優れた糸を得ることができるという利点もある。
【００１９】
【実施例】
以下、本発明を実施例を用いて詳細に説明する。なお、実施例中の測定方法は以下の方法を用いた。
【００２０】
Ａ．極限粘度［η］
オルソクロロフェノール中２５℃で測定した。
【００２１】
Ｂ．乾熱収縮率および沸騰水収縮率
乾熱収縮率（％）＝［（Ｌ０−Ｌ２）／Ｌ０）］×１００
沸騰水収縮率（％）＝［（Ｌ０−Ｌ１）／Ｌ０）］×１００
Ｌ０：延伸糸をかせ取りし初荷重０．０９ｃＮ／ｄｔｅｘ下で測定したかせの原長
Ｌ１：Ｌ０を測定したかせを実質的に荷重フリーの状態で沸騰水中で１５分間処理し、風乾後初荷重０．０９ｃＮ／ｄｔｅｘ下でのかせ長
Ｌ２：Ｌ１を測定したかせをさらに乾熱１６０℃で荷重フリーの状態で１５処理し、風乾後初荷重０．０９ｃＮ／ｄｔｅｘ下でのかせ長
Ｃ．強度および伸度
初期試料長＝５０ｍｍ、引っ張り速度＝５０ｍｍ／分とし、ＪＩＳＬ１０１３に示される条件で荷重−伸長曲線を求めた。次に荷重値を初期の繊度で割り、それを強度とし、伸びを初期試料長で割り伸度とした。
【００２２】
Ｄ複屈折度
ＯＬＩＭＰＵＳＢＨ−２偏光顕微鏡により単糸のレターデーションと光路長を測定し、Δｎを求めた。芯鞘複合糸の鞘ＰＥＴ部分のΔｎは特開平９−１７６９２０号公報記載の方法で測定した。
【００２３】
実施例１
低伸度糸として極限粘度０．６３のホモＰＥＴ（酸化チタン含有せず）、高伸度糸として該ホモＰＥＴとポリスチレン（旭化成社製“スタイロン”６８５）を別々に該ホモＰＥＴは２８５℃、該ポリスチレンは２１０℃で溶融し、絶対濾過径１５μｍのステンレス製不織布フィルターを用い別々に濾過を行った後、孔径０．２５ｍｍ、孔長０．４ｍｍ、孔数３６の口金から吐出した。この時、高伸度糸は芯／鞘＝ポリスチレン（５．０重量％）／ＰＥＴ（９５重量％）の芯鞘複合糸とした（以下ＰＳ／ＰＥＴ複合糸と略す）。そして、紡糸温度２８８℃、紡糸速度５０００ｍ／分で７２ｄｔｅｘ、３６フィラメントの未延伸混繊糸を巻き取った。この時、低伸度糸、高伸度糸とも同一繊度、同一フィラメント数（３６ｄｔｅｘ−１８フィラメントずつ）とした。低伸度糸では複屈折度０．０８５、伸度７０％、高伸度糸では複屈折度０．０３３、伸度１８０％であった（表１）。
【００２４】
上記混繊糸を図１の１対のホットーローラーを有する延伸機を用い、第１ホットーローラー３の温度９０℃、延伸速度（第２ホットローラー４の周速度）８００／ｍ分、延伸倍率１．１０とし、第２ホットローラー４の温度を表２の如く変化させて延伸を行った（実験Ｎｏ．１〜３）。第２ホットローラー４と糸条との接触時間は０．１５秒であった。
【００２５】
第２ホットローラー温度が１１０℃以上であれば、高伸度糸が自発伸長性を示し、低伸度糸の収縮応力、強伸度特性も良好であることがわかる（表２）。また、延伸時の糸揺れ、糸切れ等も無く問題なく製糸できた。またドッフ後の再スタート成功率も良好であった。また、染色斑もほとんど無く品位の高いものであった。
【００２６】
なお、各成分の単独未延伸糸条は、他方の糸条をアスピレーターで吸引分離することにより得た。そしてそれを別々に延伸することにより各成分の単独延伸糸を得ることができた。そして、それらを種々の測定にかけることにより各成分単独での物性値を求めることができた。以下の実施例も同様に各成分単独での物性値を求めた。
【００２７】
【表１】

【００２８】
【表２】

実施例２
第２ホットローラー４の温度を１２０℃、延伸倍率１．１０倍、第１ホットローラー３の温度を表３の如く変更した以外は実施例１と同様の条件で延伸を行った（実験Ｎｏ．４〜８）。物性値は表３に示す。第１ホットローラー３の温度が１１０℃以下であれば低配向側糸条は自発伸長性を示すことがわかる。また、延伸時の糸揺れ、糸切れ等も無く問題なく製糸できた。またドッフ後の再スタート成功率も良好であった。また、染色斑もほとんど無く品位の高いものであった。
【００２９】
ただし、第１ホットローラー３の温度が３０℃の場合は問題になるほどではないが若干染色斑が発生した。また、第１ホットローラー３の温度が１００℃以上となると若干糸揺れが発生し、自発伸長率も低めとなった。
【００３０】
【表３】

実施例３
紡糸速度を４０００ｍ／分、高伸度糸の芯ポリマをポリスチレンからポリメチルペンテン（三井石化社製“ＴＰＸ”ＲＴ−１８）に変更し複合比も２重量％、さらに吐出量を変更し、混繊糸で９２ｄｔｅｘ−３６フィラメントとした以外は実施例１と同様の条件で混繊糸を巻き取った。この時、低伸度糸では複屈折度０．０６６、伸度９５％、高伸度糸では複屈折度０．０２０、伸度２１５％であった（表１）。
【００３１】
この混繊糸を第２ホットローラー４の温度１２０℃、延伸倍率を表４の如く変化させた以外は実施例１と同様の条件で延伸を行った（実験Ｎｏ．９、１０）。物性値は表５に示す。延伸倍率が１．３５倍以下であれば、高伸度糸が自発伸長性を示し、低伸度糸の収縮応力、強伸度特性も良好であることがわかる。また、延伸時の糸揺れ、糸切れ等も無く問題なく製糸できた。またドッフ後の再スタート成功率も良好であった。また、染色斑もほとんど無く品位の高いものであった。
【００３２】
【表４】

実施例４
紡糸速度を３５００ｍ／分、吐出量を変更し混繊糸で９９ｄｔｅｘ−３６フィラメントとした以外は実施例１と同様の条件で未延伸混繊糸を巻き取った。この時、低伸度糸では複屈折度０．０５５、伸度１２３％、高伸度糸では複屈折度０．０１０、伸度２９５％であった（表１）。
【００３３】
この混繊糸を第２ホットローラー４の温度１２０℃、延伸倍率を１．４８倍とした以外は実施例１と同様の条件で延伸を行った（実験Ｎｏ．１１）。物性値は表５に示すが、高伸度糸が自発伸長性を示し、低伸度糸の収縮応力、強伸度特性も良好であることがわかる。また、延伸時の糸揺れ、糸切れ等も無く問題なく製糸できた。またドッフ後の再スタート成功率も良好であった。また、染色斑もほとんど無く品位の高いものであった。
【００３４】
【表５】

実施例５
低伸度糸を極限粘度０．６６のＩＰＡ８．０ｍｏｌ％およびＢＨＰＰ３．５ｍｏｌ％を共重合した酸化チタンを含まない高収縮ＰＥＴとした以外は実施例１と同様の条件で紡糸をした。低伸度糸では複屈折度０．０４０、伸度８８％、高伸度糸では複屈折度０．０３７、伸度１７６％あった（表１）。
【００３５】
この混繊糸を第２ホットローラー４の温度１２０℃、延伸倍率を１．２０倍とした以外は実施例１と同様の条件で延伸を行った（実験Ｎｏ．１２）。物性値は表６に示すが、高伸度糸が自発伸長性を示し、低伸度糸の収縮応力、強伸度特性も良好であることがわかる。さらに、収縮糸の収縮率が実施例１の場合よりも大幅に高くなり、よりふくらみ感のある収縮差混繊糸が得られた。また、延伸時の糸揺れ、糸切れ等も無く問題なく製糸できた。またドッフ後の再スタート成功率も良好であった。また、染色斑もほとんど無く品位の高いものであった。
【００３６】
【表６】

実施例６
実験Ｎｏ．２で得られた収縮差混繊糸に３００ターン／ｍのＳ撚りを施し、ゾッキで平織りを製織した。これに、常法により１０％のアルカリ減量を施した後染色、乾熱セットを行った。得られた布帛は、自発伸長糸が布帛表面に浮き出ソフトでふくらみ感があり、さらに反発感にも優れたものであった。
【００３７】
【発明の効果】
本発明の混繊糸を使用することにより、極めて簡略な工程でふくらみ、ソフト、反発感に優れた収縮差混繊糸あるいは仮撚加工糸を製造できるものである。
【図面の簡単な説明】
【図１】延伸装置を表す図である
【符号の説明】
１：未延伸糸
２：フィードローラー
３：第１ホットローラー
４：第２ホットローラー
５：コールドローラー
６：延伸糸[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a blended yarn that is a raw material for producing a different shrinkage blended yarn or false twisted yarn excellent in bulge, softness, and resilience in a very simple process.
[0002]
[Prior art]
Polyester has various excellent properties including mechanical properties, so it is used in various fields including clothing. In clothing applications, quality has been improved with natural fibers as the target. In particular, as a means to achieve a swell and soft texture, so-called shrinkage differences, in which yarns with different shrinkage properties due to heat are mixed, are used. Mixed yarn is widely used.
[0003]
As a low-cost manufacturing method for shrinkage-diffused mixed yarn, a spinning blending method in which low-shrinkage yarn and high-shrinkage yarn are mixed at the spinning / winding stage has been adopted. For example, JP-A-2-19528 discloses homopolyethylene terephthalate as a low shrinkage component, isophthalic acid (hereinafter abbreviated as IPA) and 2.2 · bis {4- (2-hydroxyethoxy) phenyl} propane (hereinafter referred to as “high shrinkage component”). A very simple method for producing a differential shrinkage mixed yarn is disclosed in which blended fiber spinning is performed using a polyester copolymerized with BHPP), and an undrawn yarn is wound up and then drawn.
[0004]
On the other hand, recently, shrinkage-diffused mixed yarn using so-called spontaneous stretch yarn that exhibits stretchability by heat has attracted attention. If this type of shrinkage difference mixed yarn is used, a sufficient yarn length difference can be obtained after the dyeing process even if the density of the fabric structure is increased. The shrinkage difference mixed yarn described in JP-A-2-19528 was used. Compared to the case, a fabric excellent in swelling and soft feeling can be obtained.
[0005]
For example, a method for producing a spontaneously stretched yarn is described in Japanese Patent Laid-Open No. 4-352836, in which a polyester partially oriented yarn (hereinafter abbreviated as POY) is once stretched and then subjected to a relaxation heat treatment. And the like. Then, this spontaneously stretched yarn is mixed with a separately produced shrink yarn later (hereinafter abbreviated as a post-mixing method) to obtain a shrinkage difference mixed yarn.
[0006]
As described above, since the relaxation heat treatment is essential for the production of the spontaneously stretched yarn, it is common to separately produce the spontaneously stretched yarn and the shrinkable yarn and then to mix them afterwards. For this reason, spontaneous elongation yarns and contraction yarns, that is, at least two types of yarns are manufactured in separate steps, which alone increases costs. Furthermore, since the cost for post-mixing is high, the cost is significantly inferior to the spinning and mixing method.
[0007]
[Problems to be solved by the invention]
The present invention provides a blended yarn as a raw material for enabling production of a shrinkage-diffused blended yarn using a spontaneously stretched yarn by a simple process.
[0008]
[Means for Solving the Invention]
The above object is a blended yarn composed of a low elongation yarn and a high elongation yarn, wherein the low elongation yarn is made of polyester, the high elongation yarn is polyester in the sheath portion, and the sheath portion is in the core portion. the polystyrene-based polymers or polymethacrylate-based polymers or one polymer selected from polymethyl pentene-based polymer, is composed of a core-sheath composite yarn which is arranged as a temperature dependency is high polymer extensional viscosity than the polyester It is achieved by a mixed fiber characterized by
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Examples of the polyester used in the present invention include polyethylene terephthalate (hereinafter abbreviated as PET), polypropylene terephthalate, polybutylene terephthalate, and the like. PET is the most versatile and preferable. Further, a part of the diol component and the acid component may be substituted with other copolymerizable components within a range of 15 mol% or less. These may also contain other polymers, matting agents, flame retardants, antistatic agents, pigments and other additives.
[0010]
Hereinafter, PET will be described as an example.
[0011]
The present invention relates to a blended yarn that is a raw material for obtaining a shrinkage-differed blended yarn including a spontaneously stretched yarn by a simple process, but a simple process in which a specific blended yarn is simply drawn and heat-treated. In this way, a shrinkage-diffused mixed yarn containing spontaneously elongated yarn is obtained. In the raw mixed yarn, it is particularly important that the raw mixed yarn is a mixed yarn composed of a low elongation yarn and a high elongation yarn. By using such a mixed yarn having a different elongation, low-stretching is applied to a high-extensibility yarn, and high-stretching is applied to a low-extensibility yarn, and mixed yarns having different effective draw ratios can be obtained. It can be done. The high elongation yarn on the low magnification drawing side can be a spontaneous elongation yarn, and the low elongation yarn on the high magnification drawing side can be a shrink yarn. For this purpose, the difference in elongation between the high elongation yarn and the low elongation yarn is preferably 80% or more. When the difference in elongation is 80% or more, the difference in shrinkage between the spontaneously stretched yarn and the contracted yarn is increased, and the feeling of swelling, softness, and resilience when fabric is improved is preferable. The difference in elongation is preferably 100% or more.
[0012]
The high elongation yarn has a polyester (sheath polyester) in the sheath and a polystyrene polymer or polymethacrylate as a polymer (core polymer) having a higher temperature dependency of elongational viscosity than the sheath polyester in the core. It is important that the core-sheath composite yarn is provided with a polymer or one polymer selected from polymethylpentene polymers. Here, the core polymer has an action of suppressing the orientation of the yarn and increasing the elongation, and the selection method thereof is described in JP-A-9-176920. Further, a polystyrene polymer is most preferable from the viewpoint of cost and spinnability. A composite ratio of 2 to 5% by weight is preferable because a sufficiently high elongation effect can be obtained, and stable spinning can be performed without breaking the yarn. And by confining the core polymer to the core of the yarn and making the surface of the PET into PET, heat resistance can be secured, process stability at the time of stretching and false twisting can be improved, and also when the fabric is dyed This makes it possible to achieve beautiful dyeing without causing dullness or staining spots.
[0013]
In addition, it is important that the low elongation yarn is made of polyester, which can ensure the mechanical strength as a blended yarn. Also, if the polymer constituting the low-elongation yarn is a high-shrinkage polymer than the sheath polyester that forms the sheath of the high-elongation yarn, the difference in shrinkage rate when the shrinkage-difference mixed yarn is made increases, and the fabric swells. A feeling can be improved and it is preferable. As the high shrinkage polyester, it is preferable to employ a polyester copolymerized with IPA. If the copolymerization ratio of IPA is 3 to 12 mol%, sufficiently high shrinkable fibers can be obtained. In addition to IPA, BHPP or the like can be copolymerized to achieve higher shrinkage.
[0014]
When the blended yarn of the present invention is used, a shrinkage difference blended yarn having a low elongation yarn as a spontaneously stretched yarn can be obtained only by a simplified process of stretching and heat treatment compared to conventional relaxation heat treatment-post blending. There is a big advantage. As a result, the cost can be significantly reduced.
[0015]
The reason why a low elongation yarn can be made into a spontaneously stretched yarn by simply drawing and heat-treating the blended yarn of the present invention is not clear, but to form a special fiber structure suitable for spontaneous elongation by the action of a specific core polymer. It is believed that there is. For example, it is possible that ultrafine crystal nuclei are generated in the sheath polyester due to the difference in viscosity behavior between the core polymer and the sheath polyester during the spinning process, and this may be a precursor of a fiber structure advantageous for spontaneous elongation.
[0016]
Although the manufacturing method of the mixed fiber of this invention is not restrict | limited at all, For example, the following method is mentioned. In other words, high elongation yarn, a polyester sheath, one of the temperature dependence of the extensional viscosity than the polyester is selected from high polystyrene polymers as polymers or polymethacrylate polymers, or polymethyl pentene-based polymer, A core-sheath composite yarn in which a polymer is arranged in the core, and two or more types of yarns in which the low elongation yarn is a polyester single yarn are discharged from the same nozzle, and after the yarn is cooled and solidified, an oil for fibers, It can be obtained by confounding and taking up at a spinning speed of 2500 m / min or more.
[0017]
In the present invention, the cross-sectional shape of the yarn is not particularly limited. However, when the cross-sectional shape is a trilobal cross-section, a square cross-section, or an irregular cross-sectional shape such as a multi-leaf cross-sectional shape, a dry touch can be achieved. There is no particular limitation on the single yarn fineness range, but it is preferable to set the high elongation yarn to 0.5 to 6.0 dtex and the low elongation yarn to 2.0 to 6.0 dtex after drawing and heat treatment. Moreover, when using it for thin garments such as blouses, it is preferable to determine the total fineness of the mixed yarn to be 30 to 110 dtex after drawing and heat treatment. Furthermore, the blend ratio of the high elongation yarn and the low elongation yarn is preferably 10/90 to 90/10 in terms of the fineness ratio.
[0018]
Further, the blended yarn of the present invention can be used as a false twisted yarn that is stretched and heat-treated to obtain a shrinkage-diffused mixed yarn, or subjected to a stretch false twisting process and has an excellent swell due to a difference in yarn length. Normally, such a differential elongation false twisted yarn uses a composite false twist method in which a high elongation yarn and a low elongation yarn are separately prepared and false twisted after blending. Since the yarn and the low elongation yarn are separately produced and false twisted after blending, the process becomes complicated. In addition, this requires a double creel false twisting machine in which two creels are prepared for a single spindle false twisting machine, resulting in restrictions on the apparatus. However, when the blended yarn of the present invention is used, it is possible to obtain a yarn having an excellent bulging feeling like a composite false twisted yarn only by ordinary drawing false twist by a normal single creel false twisting machine. There is also.
[0019]
【Example】
Hereinafter, the present invention will be described in detail with reference to examples. In addition, the measuring method in an Example used the following method.
[0020]
A. Intrinsic viscosity [η]
Measured in orthochlorophenol at 25 ° C.
[0021]
B. Dry heat shrinkage and boiling water shrinkage Dry heat shrinkage (%) = [(L0−L2) / L0)] × 100
Boiling water shrinkage rate (%) = [(L0−L1) / L0)] × 100
L0: skein of the drawn yarn and the raw length of the skein measured under an initial load of 0.09 cN / dtex L1: the skein measured for L0 was treated in boiling water for 15 minutes in a substantially load-free state and first after air drying Skein length L2 under a load of 0.09 cN / dtex: The skein of which L1 was measured was further treated with a dry heat at 160 ° C. in a load-free state 15 and after air drying, the skein length under an initial load of 0.09 cN / dtex was obtained. The load-elongation curve was obtained under the conditions shown in JIS L1013, with the initial length of the strength and elongation being 50 mm and the pulling speed was 50 mm / min. Next, the load value was divided by the initial fineness, which was taken as the strength, and the elongation was divided by the initial sample length.
[0022]
D birefringence OLIMPUS BH-2 The retardation and optical path length of a single yarn were measured with a polarizing microscope, and Δn was determined. Δn of the sheath PET portion of the core-sheath composite yarn was measured by the method described in JP-A-9-176920.
[0023]
Example 1
Homo PET (not containing titanium oxide) having an intrinsic viscosity of 0.63 as a low elongation yarn, and the homo PET and polystyrene (“Stylon” 685 manufactured by Asahi Kasei Co., Ltd.) as a high elongation yarn separately. The polystyrene was melted at 210 ° C., filtered separately using a stainless steel nonwoven fabric filter having an absolute filtration diameter of 15 μm, and then discharged from a die having a hole diameter of 0.25 mm, a hole length of 0.4 mm, and a hole number of 36. At this time, the high elongation yarn was a core / sheath = polystyrene (5.0 wt%) / PET (95 wt%) core-sheath composite yarn (hereinafter abbreviated as PS / PET composite yarn). Then, an unstretched blended yarn of 72 dtex and 36 filaments was wound at a spinning temperature of 288 ° C. and a spinning speed of 5000 m / min. At this time, both the low elongation yarn and the high elongation yarn had the same fineness and the same number of filaments (36 dtex-18 filaments each). The low elongation yarn had a birefringence of 0.085 and an elongation of 70%, and the high elongation yarn had a birefringence of 0.033 and an elongation of 180% (Table 1).
[0024]
The above blended yarn is drawn using a drawing machine having a pair of hot rollers in FIG. 1, the temperature of the first hot roller 3 is 90 ° C., and the drawing speed (the peripheral speed of the second hot roller 4) is 800 / m. The magnification was 1.10 and the temperature of the second hot roller 4 was changed as shown in Table 2 to perform stretching (Experiment Nos. 1 to 3). The contact time between the second hot roller 4 and the yarn was 0.15 seconds.
[0025]
It can be seen that when the second hot roller temperature is 110 ° C. or higher, the high elongation yarn exhibits spontaneous elongation and the shrinkage stress and strong elongation properties of the low elongation yarn are good (Table 2). In addition, the yarn could be produced without any problem with no yarn shaking or yarn breakage during drawing. The success rate after restarting after the dough was also good. Also, there was almost no staining spots and the quality was high.
[0026]
In addition, the single unstretched yarn of each component was obtained by suction-separating the other yarn with an aspirator. And it was possible to obtain a single stretched yarn of each component by stretching it separately. And the physical property value of each component was able to be calculated | required by applying them to various measurements. In the following examples, the physical property values of each component alone were also determined.
[0027]
[Table 1]

[0028]
[Table 2]

Example 2
Stretching was performed under the same conditions as in Example 1 except that the temperature of the second hot roller 4 was changed to 120 ° C., the stretching ratio was 1.10 times, and the temperature of the first hot roller 3 was changed as shown in Table 3 (Experiment No. 1). 4-8). The physical properties are shown in Table 3. If the temperature of the 1st hot roller 3 is 110 degrees C or less, it turns out that a low orientation side yarn shows spontaneous elongation. In addition, the yarn could be produced without any problem with no yarn shaking or yarn breakage during drawing. The success rate after restarting after the dough was also good. Also, there was almost no staining spots and the quality was high.
[0029]
However, when the temperature of the first hot roller 3 was 30 ° C., some staining spots were generated, although not so much as to be a problem. Moreover, when the temperature of the 1st hot roller 3 became 100 degreeC or more, the thread | yarn swayed a little and the spontaneous elongation became low.
[0030]
[Table 3]

Example 3
The spinning speed is 4000 m / min, the core polymer of the high elongation yarn is changed from polystyrene to polymethylpentene (“TPX RT-18” manufactured by Mitsui Petrochemical Co., Ltd.), the composite ratio is also 2% by weight, and the discharge rate is changed. The mixed yarn was wound up under the same conditions as in Example 1 except that the yarn was 92 dtex-36 filament. At this time, the birefringence was 0.066 and 95% for the low elongation yarn, and the birefringence was 0.020 and 215% for the high elongation yarn (Table 1).
[0031]
The mixed yarn was stretched under the same conditions as in Example 1 except that the temperature of the second hot roller 4 was changed to 120 ° C. and the stretching ratio was changed as shown in Table 4 (Experiment No. 9, 10). Physical property values are shown in Table 5. If the draw ratio is 1.35 times or less, the high elongation yarn exhibits spontaneous elongation, and the low elongation yarn has good shrinkage stress and strong elongation properties. In addition, the yarn could be produced without any problem with no yarn shaking or yarn breakage during drawing. The success rate after restarting after the dough was also good. Also, there was almost no staining spots and the quality was high.
[0032]
[Table 4]

Example 4
The undrawn blended yarn was wound up under the same conditions as in Example 1 except that the spinning speed was 3500 m / min, the discharge rate was changed, and the blended yarn was changed to 99 dtex-36 filament. At this time, the birefringence was 0.055 and 123% for the low elongation yarn, and the birefringence was 0.010 and 295% for the high elongation yarn (Table 1).
[0033]
The mixed yarn was drawn under the same conditions as in Example 1 except that the temperature of the second hot roller 4 was 120 ° C. and the draw ratio was 1.48 (Experiment No. 11). The physical property values are shown in Table 5. It can be seen that the high elongation yarn exhibits spontaneous elongation and that the low elongation yarn has good shrinkage stress and strong elongation properties. In addition, the yarn could be produced without any problem with no yarn shaking or yarn breakage during drawing. The success rate after restarting after the dough was also good. Also, there was almost no staining spots and the quality was high.
[0034]
[Table 5]

Example 5
Spinning was performed under the same conditions as in Example 1 except that the low elongation yarn was high-shrinkage PET not containing titanium oxide copolymerized with IPA 8.0 mol% and BHPP 3.5 mol% having an intrinsic viscosity of 0.66. The low elongation yarn had a birefringence of 0.040 and an elongation of 88%, and the high elongation yarn had a birefringence of 0.037 and an elongation of 176% (Table 1).
[0035]
The mixed yarn was drawn under the same conditions as in Example 1 except that the temperature of the second hot roller 4 was 120 ° C. and the draw ratio was 1.20 (Experiment No. 12). The physical property values are shown in Table 6. It can be seen that the high elongation yarn exhibits spontaneous elongation, and the low elongation yarn has good shrinkage stress and strong elongation properties. Furthermore, the shrinkage rate of the shrink yarn was significantly higher than that in Example 1, and a shrinkage difference mixed yarn with a more swelled feeling was obtained. In addition, the yarn could be produced without any problem with no yarn shaking or yarn breakage during drawing. The success rate after restarting after the dough was also good. Also, there was almost no staining spots and the quality was high.
[0036]
[Table 6]

Example 6
Experiment No. The shrinkage difference mixed yarn obtained in 2 was subjected to S twist of 300 turns / m, and a plain weave was woven with a zokkki. This was subjected to 10% alkali weight reduction by a conventional method, followed by dyeing and dry heat setting. In the obtained fabric, the spontaneously stretched yarn floated on the surface of the fabric and was soft and swelled, and was also excellent in resilience.
[0037]
【The invention's effect】
By using the blended yarn of the present invention, it is possible to produce a shrinkage-diffused blended yarn or false twisted yarn excellent in swelling, softness, and resilience in a very simple process.
[Brief description of the drawings]
FIG. 1 is a diagram showing a stretching apparatus.
1: undrawn yarn 2: feed roller 3: first hot roller 4: second hot roller 5: cold roller 6: drawn yarn

Claims

A blended yarn consisting of low and high elongation yarns. The low elongation yarn is made of polyester, the high elongation yarn is made of polyester in the sheath, and the core is stretched more than the sheath polyester. characterized in that polystyrene polymers or polymethacrylate-based polymers or one polymer selected from polymethyl pentene-based polymer, is composed of a core-sheath composite yarn which is arranged as a temperature dependency is high polymer viscosity Mixed yarn.

The blended yarn according to claim 1, wherein a difference in elongation between the low elongation yarn and the high elongation yarn is 80% or more.

The mixed fiber according to claim 1 or 2, wherein the composite ratio of the polymer disposed in the core of the high elongation yarn is 2 to 5% by weight.

The mixed yarn according to any one of claims 1 to 3, wherein the low elongation yarn is composed of a high shrinkage polyester.