JP4071028B2 - Method for producing polypropylene colored fiber having excellent color uniformity - Google Patents
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Description
【０００１】
【産業上利用分野】
本発明は、織編物を形成したときに色差による筋斑を発生させない、均色性に優れたポリプロピレン紡糸着色繊維及びその製造方法、並びにそのポリプロピレン着色繊維を使用した織編物に関する。
【０００２】
【従来の技術】
従来より、ポリエチレンやポリプロピレンから構成されるポリオレフィン繊維は、ポリマー自体に染着性がなく、顔料を紡糸工程で練り込むことで着色する紡糸着色法（以下、原着法と記載する。）が採用されてきた。原着法としては、目的とする繊維を構成する同種のポリマーに、着色顔料を予め高濃度に練り込み再賦型したペレット（マスターバッチ。以下、ＭＢと略記する。）を作成し、目的とする色調が得られるように主原料とＭＢの希釈率を、ペレットの混合比率によって調整した後、溶融混練して紡糸する方法が一般的であった。
【０００３】
一方、原着繊維中に顔料の分布斑が存在すると、繊維長方向及び繊維間に色差が発現し、この繊維を織編物にしたとき、筋斑が発生し、布帛の品位を悪化させる。このような原着繊維中の顔料の分布斑を改善する方法として、ＭＢ供給装置の精度向上、ブレンダーの精度向上、押出機混練技術の向上等が提案されてきた。
【０００４】
さらに、ＭＢの供給安定性を向上させるべく、主原料を溶融する押出機とは別に、ＭＢを別の押出機で溶融した後、計量しながら溶融した主原料に練り込むメルトブレンド方式（溶融混合）が採用されるようになった。このメルトブレンド方式の導入により繊維長方向の混合不均一性は大幅に改善された。
【０００５】
しかし、多錘紡糸機を使用する工業生産設備では、各紡糸錘へのポリマー分配斑が発生し、得られる原着繊維中に顔料の分布斑が生じる。これらの対策として特開平５−１９５３０７号公報には静置式混練素子の導入等による溶融ポリマー管中での混練強化が開示されている。また、特開平６−１０１１０９号公報には溶融ポリマー計量装置（ギヤーポンプ。以下、ＧＰと略記する。）の直前に、静置式混練素子を配設する技術が開示されている。しかしながら、これら静置式混練素子で十分な効果を得るためには多くの段数（ユニット数）が必要であり、大きな設備スペースを必要とする。さらに、主原料とＭＢの溶融粘度が大きく異なったり、希釈率が大きい場合には混練効果が不足するという問題がある。
【０００６】
【発明が解決しようとする課題】
本発明は、織編物としたとき、筋斑等の色斑を発生させない均色性に優れたポリプロピレン原着繊維及び該原着繊維の製造方法を提供することにある。
【０００７】
【課題を解決するための手段】
本発明は、２０点のサンプルについて測色計「マクベス分光光度計」で測定される明度の最大値と最小値の差△Ｌ*が０．８以下であるポリプロピレンから構成される紡糸着色繊維にあり、該着色繊維は５６〜５６０ｄｔｅｘのマルチフィラメント捲縮糸であることが望ましい。
【０００８】
また、本発明は、主押出機から供給される溶融ポリプロピレンと、別の押出機から供給される顔料を含む溶融ポリプロピレンとを、顔料を含む溶融ポリプロピレンの希釈率が３０倍未満となる割合で合流させて複合流とした後、直ちにギヤーポンプ直前に配設された動的混練素子を通過させ、紡糸口金より紡糸することを特徴とするポリプロピレンから構成される紡糸着色繊維の製造方法にある。
【０００９】
【発明の実施の形態】
本発明において原着繊維の均色性については、紡糸錘間または繊維長方向に、任意に採取した２０点のサンプルについて筒状編地を作成し、測色計「マクベス分光光度計」で測定した明度の最大値と最小値の差バラツキ△Ｌ*が０．８以下であることが織編物を作成したとき、筋斑と認識される色差を発生させないために必要であることを知見した。原着繊維の△Ｌ*が０．８を超える繊維の集団である糸で織編物を作成したとき、その色差（色斑）は目視で認識できる程の筋斑となる。
【００１０】
本発明の原着繊維の繊度及びフィラメント数に関しては、用途に応じて任意に設定されても何ら問題は無いが、織編物としたとき、布帛の柔軟性等、風合面から５６ｄｔｅｘから５６０ｄｔｅｘの範囲が好ましく、フィラメント数は、単繊維繊度が２．２から４．４ｄｔｅｘの範囲となることが好ましい。
【００１１】
本発明の原着繊維の強度については、織編物として布帛強度を維持するとともに、後加工工程を通過するに耐える強力があれば特に問題ない。更に、繊維の断面形状についても特に限定されるものではなく、円形または楕円、三角或いは四角等の多角形であってもよく、トリローバル等の多葉形状であってもよい。また、繊維は中実であっても中空形状であってもよい。
【００１２】
一方、本発明の原着繊維は、捲縮糸であることが織編物に柔軟性及び膨らみ感を付与する上で重要である。しかし、捲縮付与の方法及び捲縮水準については、特に限定されるものではない。例えば、延伸糸を仮撚加工したような高捲縮糸（捲縮率＝２５〜４０％）であっても、コンジュゲート糸や、熱風による座屈捲縮加工糸のような低捲縮糸（捲縮率＜２５％）であってもよい。
【００１３】
本発明の原着繊維に使用されるポリプロピレンは、ホモポリマーであってもランダムコポリマーであってもよい。この場合、コモノマーは特に限定されるものではなく、エチレンや、ブテン−１などが一般的である。プロピレンからポリプロピレンを製造するにあたり使用される触媒は、特に限定されるものではない。また、ポリプロピレンのＱ値（重量平均分子量／数平均分子量の比）は、溶融紡糸工程における製糸安定性の点から５未満であることが望ましいが、特に限定されるものではない。
【００１４】
用いるポリプロピレンには、得られる繊維の用途に応じて酸化防止剤、光安定剤、紫外線吸収剤、帯電防止剤、中和剤、可塑剤、抗菌剤、難燃剤等の添加剤を製糸性を損なわない範囲で添加させることができる。特に光安定剤としてはヒンダードアミン系安定剤を使用することが好ましい。
【００１５】
本発明の原着繊維の主原料であるプロピレンのメルトフローレート値（以下、ＭＦＲと略称する。）は、ＪＩＳ−Ｋ−７２１０に準拠し、測定温度２３０℃、測定荷重２．１６ｋｇにより測定される。主原料ポリプロピレンのＭＦＲは３以上であることが好ましく、さらに製糸安定性の点から１０以上６０以下の範囲であることがより好ましい。
【００１６】
また、本発明において、ＭＢに使用されるポリプロピレンのＭＦＲについても特に限定されるものではないが、製糸安定性の点から１０以上６０以下の範囲であることが好ましく、さらに主原料となるポリプロピレンのＭＦＲとＭＢに使用するポリプロピレンのＭＦＲの差は小さく、主原料となるポリプロピレンのＭＦＲよりもＭＢのＭＦＲの方が大きいことが均色性を得る上でよ好ましい。
【００１７】
また、主原料であるポリプロピレンとＭＢの配合比率（希釈率）は、主原料であるポリプロピレンのＭＦＲとＭＢに用いるポリプロピレンのＭＦＲの組合せ及びＭＢ中の顔料濃度にもよるが、３０倍未満、好ましくは２０倍以下が均色性を維持する上で好ましい。
【００１８】
本発明の原着繊維は、主押出機で溶融混練された溶融ポリプロピレン流に、別の押出機で溶融混練された溶融ＭＢ流をＧＰを介して導入して複合流となし、次いで、直ちに動的混練素子により機械的に強制混練した後、ＧＰを介して紡糸口金に導き、紡糸して得られる。主原料である溶融ポリプロピレン流と溶融ＭＢポリマー流を合流する紡糸工程上の位置は、ポリマー管であっても、紡糸口金直前のＧＰの部分であってもよいが、紡糸錘間の分配斑を回避するためには、紡糸口金直前のＧＰの部分がより好ましい。
使用する動的混練素子としては、ＧＰ直前に動的混練素子が配設されているバーマーグ社製「ＰＲＯＭＩＸ ＰＵＭＰ」（商品名）を使用することが好ましい。
【００１９】
【実施例】
り
以下、本発明を実施例により具体的に説明する。説明中「％」は質量％を示す。
なお、原着繊維の明度は次の方法で測定した。
［繊維の明度］
１．測定機器
マクべス分光光度計（Ｍａｃｂｅｔｈ ７０００Ａ）
測色ソフトＣＯＬＯＲ ＳＣＯＰＥ（住化カラー）色相管理ソフト
２．主要な測定条件（ＪＩＳ Ｚ８７２９に準拠）
サンプル形態：筒編地を縦方向に二つ折にして測定
サンプル量 ：５ｇ
測定方法 ：Ｄ６５光源、１０度視野。２０点のサンプルについて測定
評価方法 ：ΔＬ* ａ* ｂ* 表色系により、Ｌ* 測定値のバラツキで濃淡差を判定。
【００２０】
［実施例１］
ＭＦＲ値が３０ｇ／１０分のポリプロピレン（日本ポリケム社製造の商品名「ＳＡ０３」を使用）を主原料とし、紺色の顔料（大日本インキ社製造のＭＢ「Ｍ５２」を使用）２０％含有するポリプロピレンからなるＭＦＲ値が３７．６ｇ／１０分の着色用ＭＢを使用して、青色のポリプロピレン原着マルチフィラメント糸を得た。
【００２１】
主原料のポリプロピレンは、２５０℃に調整された図１に示す押出機Ａで溶融混練して溶融ポリマーａとした。着色用ＭＢは２５０℃に調整された押出機Ｂで溶融混練して着色溶融ポリマーｂとした。溶融ポリマーｂは、希釈率が１０倍となるようにＧＰで計量しながら、ＧＰ直前に動的混練素子３ＤＤＭ（3Dimension Dynamics Mixer）（以下、単に動的混練素子と略記する。）を配設したバーマーグ社製「ＰＲＯＭＩＸ ＰＵＭＰ」に導き、溶融ポリマー流に供給して複合流とされた後、動的混練素子により混合し、吐出量８８．１ｇ／分となるよう計量され、０．３０ｍｍφの丸孔が６０孔配設された紡糸口金から、紡糸温度２５０℃で紡糸し、巻取速度２１００ｍ／分で巻取り４２０ｄｔｅｘ６０ｆの未延伸糸を得た。
【００２２】
得られた未延伸糸を仮撚温度１５５℃、撚数２０３０Ｔ／Ｍ、倍率２．２倍、仮撚張力２４ｇの条件下で延伸仮撚し、１９０ｄｔｅｘ６０ｆ、捲縮率３８％の青色原着ポリプロピレン仮撚加工糸を得た。この仮撚加工糸を靴下編機で筒状編地にした後、測色計「マクべス分光光度計」で明度を測定した。その結果を表１に示した。編地作成に使用した仮撚加工糸は、異なる紡糸錘から製造された未延伸糸から仮撚加工した２０点以上のサンプルから任意に採取した。
【００２３】
［実施例２］
実施例１で用いたものと同じ主原料ポリプロピレン、着色用ＭＢを使用して、青色のポリプロピレン原着マルチフィラメント糸を得た。
主原料のポリプロピレンは２５０℃に調整された押出機Ａで溶融混練して溶融ポリマーａとした。着色用ＭＢは２４０℃に調整された押出機Ｂで溶融混練して着色溶融ポリマーｂとした。溶融ポリマーｂは希釈率が２０倍となるようにＧＰで計量しながら、バーマーグ社製「ＰＲＯＭＩＸ ＰＵＭＰ」に導き、溶融ポリマーａに供給された後、動的混練素子により混合し、吐出量４４．６ｇ／分となるよう計量され、０．２５ｍｍφの丸孔が３６孔配設された紡糸口金から、紡糸温度２５０℃で紡糸し、巻取速度２１００ｍ／分で巻取り、２２３ｄｔｅｘ３６ｆの未延伸糸を得た。この未延伸糸を延伸倍率２．６５６倍で延伸し、８４ｄｔｅｘ３６ｆの延伸糸を得た。
得られた延伸糸を仮撚温度１５５℃、撚数３３００Ｔ／Ｍ、仮撚張力１３ｇの条件下で仮撚し、捲縮率３５％の青色原着ポリプロピレン仮撚加工糸を得た。この仮撚加工糸を実施例１と同様にして編地にした後、明度を測定した。その結果を表１に示した。
【００２４】
［実施例３〜６］
主原料となるポリプロピレンのＭＦＲ値と着色用ＭＢの希釈率を表１に示すように種々変更し、実施例１と同条件で紡糸し、巻き取ることなく、引き続き、延伸倍率２．３倍で延伸し、熱風温度１７０℃で座屈捲縮付与（ＢＣＦ）して巻取り、１９０ｄｔｅｘ６０ｆの捲縮加工糸を得た。得られた捲縮加工糸を実施例１と同様にして編地にした後、明度を測定した。その結果を表１に示した。
【００２５】
［比較例１］
実施例１で使用した主原料用ポリプロピレンと着色用ＭＢを、希釈率が１０倍となるように、予めペレットでブレンドした後、押出機で溶融混練し、さらに溶融ポリマー移送管の途中に配設された１３段のケニックスタイプ静止型混練素子ＳＭ（駆動部を有しない連続混合攪拌装置）で混練する以外は、実施例１と同様にして１９０ｄｔｅｘ／６０ｆの仮撚加工糸を得た。得られた仮撚加工糸を実施例１と同様にして編地にした後、明度を測定した。その結果を表１に示した。
本例による仮撚加工糸２０点のサンプルから測定した明度のバラツキ（△Ｌ*）は１．５９と大きく、目視でも十分認識できる色差が確認された。
【００２６】
［比較例２］
実施例１で使用した主原料用ポリプロピレンと着色用ＭＢを、図２に示したような夫々押出機Ａと押出機Ｂで溶融混練した後、溶融ポリマーｂをポリマー管の途中部分で溶融ポリマーａに導入し、ポリマー管の途中に配設された１３段のケニックスタイプ静止型混練素子により混練する以外は、実施例１と同様にして１９０ｄｔｅｘ／６０ｆの仮撚加工糸を得た。得られた仮撚加工糸を実施例１と同様にして編地にした後、明度を測定した。その結果を表１に示した。
【００２７】
［比較例３］
主原料となるポリプロピレンのＭＦＲ値を１０ｇ／１０分とする以外は比較例２と同条件で１９０ｄｔｅｘ／６０ｆの仮撚加工糸を得た。得られた仮撚加工糸を実施例１と同様にして編地にした後、明度を測定した。その結果を表１に示した。
【００２８】
［比較例４］
主原料用ポリプロピレンと着色用ＭＢの希釈率を３０倍とする以外は実施例１と同条件で１９０ｄｔｅｘ／６０ｆの仮撚加工糸を得た。得られた仮撚加工糸を実施例１と同様にして編地にした後、明度を測定した。その結果を表１に示した。
比較例２、３、４については、仮撚加工糸での色差は目視では確認できなかったが、編物にした時、色差が筋斑として顕在化した。
【００２９】
【表１】
【発明の効果】
本発明によるポリプロピレン原着マルチフィラメントは、優れた均色性を有し、織編物素材として用いられた時、色斑のない良好な織編物を提供できる。
【図面の簡単な説明】
【図１】本発明の実施例で使用した紡糸設備の概念図である。
【図２】本発明の比較例２，３で使用した紡糸設備の概念図である。
【図３】ＧＰ直前に動的混練素子３ＤＤＭを配設したバーマーグ社製「ＰＲＯＭＩＸ ＰＵＭＰ」の概略図である。
【符号の説明】
Ａ：主原料押出機
ａ：主原料流
Ｂ：ＭＢ押出機
ｂ：ＭＢ流
ｃ：混合流
ＤＭ：動的混練素子
ＧＰ：ギヤーポンプ
Ｄ：紡糸ヘッド
ＳＭ：静止型混練素子[0001]
[Industrial use field]
The present invention relates to a polypropylene spun-colored fiber excellent in color uniformity, which does not generate streaks due to a color difference when a woven / knitted fabric is formed, a method for producing the same, and a woven / knitted fabric using the polypropylene-colored fiber.
[0002]
[Prior art]
Conventionally, a polyolefin fiber composed of polyethylene or polypropylene has a dyeing property in which the polymer itself has no dyeing property and is colored by kneading a pigment in a spinning process (hereinafter referred to as an original deposition method). It has been. As the original deposition method, a pellet (master batch, hereinafter abbreviated as MB) is prepared by kneading a color pigment in a high concentration in the same kind of polymer constituting the target fiber in advance and remolding. In general, the dilution ratio of the main raw material and MB is adjusted by the mixing ratio of the pellets so as to obtain the color tone, and then melt melt-kneaded and spinning.
[0003]
On the other hand, if pigment distribution spots are present in the original fibers, a color difference appears between the fibers in the fiber length direction and between the fibers. When these fibers are woven or knitted, streaks are generated and the quality of the fabric is deteriorated. As a method of improving the distribution unevenness of the pigment in the original fiber, improvement of the accuracy of the MB supply device, improvement of the blender accuracy, improvement of the extruder kneading technique, and the like have been proposed.
[0004]
Furthermore, in order to improve the supply stability of MB, apart from the extruder that melts the main raw material, the MB is melted in a separate extruder and then kneaded into the molten main raw material while measuring (melt mixing) ) Has been adopted. By introducing this melt blending method, the mixing non-uniformity in the fiber length direction was greatly improved.
[0005]
However, in an industrial production facility using a multi-spindle spinning machine, polymer distribution spots occur on each spinning spindle, and pigment distribution spots occur in the obtained original fiber. As a countermeasure against these problems, JP-A-5-195307 discloses kneading strengthening in a molten polymer tube by introducing a stationary kneading element or the like. Japanese Patent Application Laid-Open No. 6-101109 discloses a technique in which a stationary kneading element is disposed immediately before a molten polymer metering device (gear pump, hereinafter abbreviated as GP). However, in order to obtain a sufficient effect with these stationary kneading elements, a large number of stages (number of units) is required, and a large equipment space is required. Furthermore, there is a problem that the kneading effect is insufficient when the melt viscosity of the main raw material and MB is greatly different or the dilution ratio is large.
[0006]
[Problems to be solved by the invention]
An object of the present invention is to provide a polypropylene original fiber excellent in color uniformity that does not cause color spots such as streaks when woven or knitted, and a method for producing the original fiber.
[0007]
[Means for Solving the Problems]
The present invention relates to a spin-colored fiber composed of polypropylene having a difference ΔL * between a maximum value and a minimum value of brightness measured with a colorimeter “Macbeth spectrophotometer” for 20 samples. The colored fiber is preferably a multifilament crimped yarn of 56 to 560 dtex.
[0008]
Further, the present invention joins the molten polypropylene supplied from the main extruder and the molten polypropylene containing the pigment supplied from another extruder at a ratio such that the dilution rate of the molten polypropylene containing the pigment is less than 30 times. after the composite stream is immediately gear pump just prior to passing the disposed dynamic mixing kneading elements, in the manufacturing method of the formed spun colored fibers of polypropylene, characterized in that the spun from the spinneret.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
In the present invention, the color uniformity of the original fibers is measured with a colorimeter “Macbeth spectrophotometer” by creating a cylindrical knitted fabric for 20 samples taken arbitrarily between the spinning spindles or in the fiber length direction. It was found that the difference variation ΔL * between the maximum value and the minimum value of brightness was 0.8 or less when creating a woven or knitted fabric so as not to cause a color difference recognized as a streak. When a knitted or knitted fabric is made of yarn that is a group of fibers with an original fiber ΔL * exceeding 0.8, the color difference (color spot) becomes a streak that can be visually recognized.
[0010]
Regarding the fineness and the number of filaments of the original fiber of the present invention, there is no problem even if it is arbitrarily set according to the use. However, when a woven or knitted fabric is used, the flexibility of the fabric, etc., from 56 dtex to 560 dtex The range is preferable, and the number of filaments is preferably in the range of 2.2 to 4.4 dtex for single fiber fineness.
[0011]
With respect to the strength of the original fiber of the present invention, there is no particular problem as long as the fabric strength is maintained as a woven or knitted fabric and it has a strength sufficient to pass through the post-processing step. Furthermore, the cross-sectional shape of the fiber is not particularly limited, and may be a circle, an ellipse, a polygon such as a triangle or a square, or a multilobal shape such as a trilobal. Further, the fiber may be solid or hollow.
[0012]
On the other hand, it is important that the original fiber of the present invention is a crimped yarn in order to impart flexibility and swelling to a woven or knitted fabric. However, the crimping method and the crimping level are not particularly limited. For example, even a high crimped yarn (crimp rate = 25-40%) obtained by false twisting of drawn yarn is a low crimped yarn such as a conjugate yarn or a buckled crimped yarn by hot air. (Crimp rate <25%) may be sufficient.
[0013]
The polypropylene used for the original fiber of the present invention may be a homopolymer or a random copolymer. In this case, the comonomer is not particularly limited, and ethylene, butene-1, and the like are common. The catalyst used for producing polypropylene from propylene is not particularly limited. In addition, the Q value (ratio of weight average molecular weight / number average molecular weight) of polypropylene is preferably less than 5 from the viewpoint of spinning stability in the melt spinning process, but is not particularly limited.
[0014]
Polypropylene used has additives such as antioxidants, light stabilizers, ultraviolet absorbers, antistatic agents, neutralizers, plasticizers, antibacterial agents, flame retardants, etc. It can be added in a range not present. In particular, it is preferable to use a hindered amine stabilizer as the light stabilizer.
[0015]
The melt flow rate value (hereinafter abbreviated as MFR) of propylene, which is the main raw material of the original fiber of the present invention, is measured at a measurement temperature of 230 ° C. and a measurement load of 2.16 kg in accordance with JIS-K-7210. The The MFR of the main raw material polypropylene is preferably 3 or more, and more preferably in the range of 10 or more and 60 or less from the viewpoint of the stability of yarn production.
[0016]
In the present invention, the MFR of polypropylene used for MB is not particularly limited, but is preferably in the range of 10 or more and 60 or less from the viewpoint of yarn production stability. The difference in MFR between the polypropylene used for MFR and MB is small, and it is more preferable for obtaining color-matching that the MFR of MB is larger than the MFR of polypropylene as the main raw material.
[0017]
The blending ratio (dilution ratio) of the main raw material polypropylene and MB is less than 30 times , although it depends on the combination of the MFR of the main raw material polypropylene and the MFR of the polypropylene used in the MB and the pigment concentration in the MB. Is preferably 20 times or less in order to maintain the color uniformity.
[0018]
The cored fiber of the present invention is introduced into a melted polypropylene stream melt-kneaded by a main extruder through a GP through a melt MB stream melt-kneaded by another extruder through a GP to form a composite stream. After mechanically kneading with a mechanical kneading element, it is guided to a spinneret via GP and spun. The position on the spinning process where the molten polypropylene stream and the molten MB polymer stream, which are the main raw materials, may be the polymer pipe or the GP part immediately before the spinneret, but the distribution unevenness between the spinning spindles In order to avoid this, the GP portion immediately before the spinneret is more preferable.
As the dynamic kneading element to be used, it is preferable to use “PROMIX PUMP” (trade name) manufactured by Barmag Co., Ltd., in which the dynamic kneading element is disposed immediately before the GP.
[0019]
【Example】
Hereinafter, the present invention will be specifically described by way of examples. In the description, “%” indicates mass%.
In addition, the lightness of the original fiber was measured by the following method.
[Fiber brightness]
1. Measuring instrument Macbeth spectrophotometer (Macbeth 7000A)
1. Color measurement software COLOR SCOPE (Sumitomo Color) hue management software Major measurement conditions (conforms to JIS Z8729)
Sample form: Folded tube knitted fabric in the vertical direction and measured sample amount: 5g
Measuring method: D65 light source, 10 degree field of view. Measurement evaluation method for 20 samples: ΔL * a * b * Color system is used to determine the difference in light and shade based on variations in L * measurement values.
[0020]
[Example 1]
Polypropylene containing 20% amber pigment (using MB “M52” manufactured by Dainippon Ink and Co., Ltd.) with a MFR value of 30 g / 10 min polypropylene (using the product name “SA03” manufactured by Nippon Polychem) Using a MB for coloring having an MFR value of 37.6 g / 10 min, a blue polypropylene-based multifilament yarn was obtained.
[0021]
The main raw material polypropylene was melt-kneaded with an extruder A shown in FIG. The coloring MB was melt-kneaded with an extruder B adjusted to 250 ° C. to obtain a colored molten polymer b. A melt kneading element 3DDM (hereinafter simply referred to as a dynamic kneading element) is disposed immediately before the GP while the molten polymer b is measured by GP so that the dilution rate becomes 10 times. Leaded to Barmag Co., Ltd. “PROMIX PUMP”, supplied to the molten polymer stream to form a composite stream, mixed by a dynamic kneading element, weighed to a discharge rate of 88.1 g / min, and a 0.30 mmφ round Spinning was performed at a spinning temperature of 250 ° C. from a spinneret having 60 holes, and an undrawn yarn with a winding of 420 dtex 60 f was obtained at a winding speed of 2100 m / min.
[0022]
The obtained undrawn yarn was drawn and twisted under the conditions of a false twist temperature of 155 ° C., a twist number of 2030 T / M, a magnification of 2.2 times, and a false twist tension of 24 g. A false twisted yarn was obtained. The false twisted yarn was formed into a tubular knitted fabric with a sock knitting machine, and the lightness was measured with a colorimeter “Macbeth spectrophotometer”. The results are shown in Table 1. The false twisted yarn used for knitted fabric preparation was arbitrarily collected from 20 or more samples false twisted from undrawn yarns manufactured from different spinning spindles.
[0023]
[Example 2]
Using the same main raw material polypropylene and coloring MB as those used in Example 1, a blue polypropylene original multifilament yarn was obtained.
The main raw material polypropylene was melt kneaded with an extruder A adjusted to 250 ° C. to obtain a molten polymer a. The coloring MB was melt-kneaded with an extruder B adjusted to 240 ° C. to obtain a colored molten polymer b. The molten polymer b is measured by GP so that the dilution rate becomes 20 times, and is guided to “PROMIX PUMP” manufactured by Barmag, supplied to the molten polymer a, and then mixed by a dynamic kneading element. Spinning at a spinning temperature of 250 ° C. from a spinneret with 36 round holes of 0.25 mmφ measured at 6 g / min, wound at a winding speed of 2100 m / min, and undrawn yarn of 223 dtex 36f Obtained. This undrawn yarn was drawn at a draw ratio of 2.656 times to obtain a drawn yarn of 84 dtex 36f.
The drawn yarn thus obtained was false twisted under the conditions of a false twisting temperature of 155 ° C., a twist number of 3300 T / M, and a false twisting tension of 13 g to obtain a blue original polypropylene false twisted yarn having a crimp rate of 35%. The false twisted yarn was made into a knitted fabric in the same manner as in Example 1, and then the lightness was measured. The results are shown in Table 1.
[0024]
[Examples 3 to 6]
As shown in Table 1, the MFR value of polypropylene as the main raw material and the dilution rate of the MB for coloring were changed variously, and spinning was performed under the same conditions as in Example 1. Subsequently, the draw ratio was 2.3 times without winding. It was stretched, and buckled and crimped (BCF) at a hot air temperature of 170 ° C. and wound up to obtain a 190 dtex 60f crimped yarn. The obtained crimped yarn was knitted in the same manner as in Example 1, and the lightness was measured. The results are shown in Table 1.
[0025]
[Comparative Example 1]
The main raw material polypropylene and coloring MB used in Example 1 were blended in advance with pellets so that the dilution rate would be 10 times, then melt-kneaded with an extruder, and further placed in the middle of the molten polymer transfer pipe A 190 dtex / 60 f false twisted yarn was obtained in the same manner as in Example 1 except that the kneading was performed using the 13-stage Kenix type static kneading element SM (continuous mixing and stirring device having no drive unit). After the obtained false twisted yarn was knitted in the same manner as in Example 1, the lightness was measured. The results are shown in Table 1.
The lightness variation (ΔL * ) measured from a sample of 20 false twisted yarns according to this example was as large as 1.59, and a color difference that could be recognized visually was confirmed.
[0026]
[Comparative Example 2]
After melting and kneading the main raw material polypropylene and coloring MB used in Example 1 with an extruder A and an extruder B as shown in FIG. 2, the molten polymer b was melted at the middle portion of the polymer tube with the molten polymer a. A false twisted yarn of 190 dtex / 60 f was obtained in the same manner as in Example 1 except that the yarn was kneaded with a 13-stage Kenix type static kneading element disposed in the middle of the polymer tube. After the obtained false twisted yarn was knitted in the same manner as in Example 1, the lightness was measured. The results are shown in Table 1.
[0027]
[Comparative Example 3]
A 190 dtex / 60 f false twisted yarn was obtained under the same conditions as in Comparative Example 2 except that the MFR value of polypropylene as the main raw material was 10 g / 10 min. After the obtained false twisted yarn was knitted in the same manner as in Example 1, the lightness was measured. The results are shown in Table 1.
[0028]
[Comparative Example 4]
A 190 dtex / 60 f false twisted yarn was obtained under the same conditions as in Example 1 except that the dilution ratio of the main raw material polypropylene and the coloring MB was 30 times. After the obtained false twisted yarn was knitted in the same manner as in Example 1, the lightness was measured. The results are shown in Table 1.
In Comparative Examples 2, 3, and 4, the color difference in the false twisted yarn could not be confirmed by visual observation, but when the knitted fabric was used, the color difference became apparent as streaks.
[0029]
[Table 1]
【The invention's effect】
The polypropylene original multifilament according to the present invention has excellent color uniformity, and when used as a woven or knitted material, can provide a good knitted or knitted fabric without color spots.
[Brief description of the drawings]
FIG. 1 is a conceptual diagram of a spinning equipment used in an embodiment of the present invention.
FIG. 2 is a conceptual diagram of a spinning facility used in Comparative Examples 2 and 3 of the present invention.
FIG. 3 is a schematic view of “PROMIX PUMP” manufactured by Barmag Co., Ltd. in which a dynamic kneading element 3DDM is disposed immediately before GP.
[Explanation of symbols]
A: Main raw material extruder a: Main raw material flow B: MB extruder b: MB flow c: Mixed flow DM: Dynamic kneading element GP: Gear pump D: Spinning head SM: Stationary kneading element
Claims (1)
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| JP2002104497A JP4071028B2 (en) | 2002-04-05 | 2002-04-05 | Method for producing polypropylene colored fiber having excellent color uniformity |
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| JP2002104497A JP4071028B2 (en) | 2002-04-05 | 2002-04-05 | Method for producing polypropylene colored fiber having excellent color uniformity |
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