JP4326055B2

JP4326055B2 - Well-shaped cross-section hollow fiber

Info

Publication number: JP4326055B2
Application number: JP00123299A
Authority: JP
Inventors: 武史西山; 雅樹西村; 裕志西田; 吉則塚田
Original assignee: Unitika Ltd
Current assignee: Unitika Ltd
Priority date: 1999-01-06
Filing date: 1999-01-06
Publication date: 2009-09-02
Anticipated expiration: 2019-01-06
Also published as: JP2000199122A

Description

【０００１】
【発明の属する技術分野】
本発明は、軽量性、嵩高性、保温性、撥水性などに優れ、独特の風合いを持つ井型断面中空繊維であって、光沢の抑えられた優れた艶消し効果を有し、かつ良好に巻き取ることができる井型断面中空繊維に関するものである。
【０００２】
【従来の技術】
合成繊維における高い付加価値を持つ中空繊維として、井型断面中空繊維が開発されている（特開平8-127936号公報、特開平10-110324 号公報）。この繊維は、井型断面という特殊な単糸断面形状から、独特の風合いを持ち、中空部により形成されるデッドエアー部と突起部により単糸間に形成されるデッドエアー部により、高い軽量性、嵩高性、保温性を備え、突起部による水滴との接触面積の低さから、撥水性にも優れている。
【０００３】
しかしながら、この繊維は、井型断面という特殊な単糸断面形状のため、外部からの入射光が単糸断面外周の突起部で反射し、かなり強い独特の光沢を呈し、用途によってはその光沢感が繊維製品の外観を損ねてしまい、使用し難いという問題があった。
【０００４】
一般的に、合成繊維の光沢感を抑えるためには、熱可塑性ポリマーに酸化チタン微粒子を含有させる方法が行われている。
しかしながら、井型断面繊維の場合、少量の酸化チタン微粒子の添加では単糸断面外周の突起部で起こる光の反射を十分に抑えることができない。酸化チタン微粒子の添加量を増加させると、光の反射を抑えることは可能になるが、繊維の強伸度及び形状の安定性が低下しやすく、また、単糸表面に酸化チタン微粒子が突出し、糸と糸の間の接触面積が少なくなって、摩擦係数が低くなるために、巻き取り時にパッケージ端面で綾落ちが生じるという問題があった。
【０００５】
特に井型断面中空繊維は、糸と糸とが単糸断面外周の突起部で接触するため、接触面積が通常の丸断面繊維等と比べて極めて小さく、摩擦係数も小さい。このため、酸化チタン微粒子の添加量の増加による摩擦係数の低下は著しく、パッケージ端面での綾落ち発生は顕著なものとなる。
【０００６】
【発明が解決しようとする課題】
本発明は、上述した問題点を解決し、酸化チタン微粒子を含有することによって、光沢が抑えられて優れた艶消し効果を有し、かつ摩擦係数が高く、巻き取り時に綾落ちがなく良好に巻き取ることが可能な井型断面中空繊維を提供することを技術的な課題とするものである。
【０００７】
【課題を解決するための手段】
本発明者らは上記課題を解決するために鋭意研究の結果、本発明に到達した。すなわち、本発明は、熱可塑性ポリマーからなり、横断面形状が中心部付近に中空部を有する四角形部のそれぞれの角に、略直角をなす２つの突起部を有する井型面形状を呈する中空繊維であって、酸化チタン微粒子を繊維全体の0.1 〜10.0重量％含有し、トリイソステアリルトリメリテートを含む油剤が繊維表面に繊維全体の1.0 重量％以上付与されており、繊維の糸／糸動摩擦係数（Ｆ／Ｆμｄ）が2.9 以上であることを特徴とする井型断面中空繊維を要旨とするものである。
【０００８】
なお、本発明における繊維の糸／糸動摩擦係数（Ｆ／Ｆμｄ）は、図３に示すような測定装置を用いて測定した。糸送りローラ４、９間を速度100 ｍ／分で糸条を走行させ、初荷重Ｔ１＝10ｇ（荷重Ｗ＝20ｇ）を動滑車５にかけて糸条を走行させ、糸条をガイド７で３回撚り合わせる。糸条の撚り合わせ後の応力Ｔ２（ｇ）をテンションメーター８にて測定し、初荷重Ｔ１に対する応力Ｔ２の比として、Ｆ／Ｆμｄ＝Ｔ２／Ｔ１で求めた。
【０００９】
また、嵩高率とは、横断面における中空部と突起部で形成されるデッドエアー部の面積の割合をいう。測定法は、ニコン社製マイクロフォトＳ光学顕微鏡に顕微鏡写真撮影装置を取り付け、５本の単糸について、単糸の横断面形状を撮影し、図２の断面模式図に示すように、面積Ａと面積Ｂの値を算出し、次のようにして求めるものであり、５本の平均値とする。
嵩高率（％）＝〔（面積Ａ）／（面積Ａ＋面積Ｂ）〕×100
【００１０】
【発明の実施の形態】
次に、本発明について詳細に説明する。
本発明の井型断面中空繊維を構成する熱可塑性ポリマーとしては、ナイロン６、ナイロン１１、ナイロン１２、ナイロン４６、ナイロン６６、ナイロン６１０等を主成分とするポリアミド、ポリエチレンテレフタレート、ポリブチレンテレフタレート等を主成分とするポリエステル、ポリエチレン、ポリプロピレン等を主成分とするポリオレフィン等が挙げられる。
特に、ナイロン６を中心とするポリアミドを熱可塑性ポリマーとして用いた場合、従来のポリアミド繊維にはみられない独特のドライタッチな風合いの繊維を得ることが可能となる。
【００１１】
次に、本発明の繊維の形状について図面を用いて説明する。図１は本発明の井型断面中空繊維の一実施態様を示す断面模式図である。
本発明の繊維は、横断面形状が四角形であり、中心部付近に中空部１を有する中空繊維の四角形部３のそれぞれの角に、略直角をなす２つの突起部２を有する井型断面形状を呈するものである。
【００１２】
このように、井型断面形状を呈していることによって、マルチフィラメント糸として各単糸が重なり合ったときに、各単糸の有する突起部により多数の中空部（デッドエアー部）が形成され、嵩高性と保温性に優れる繊維となる。さらに、繊維表面に多数の突起部が現れることによっても嵩高性、撥水性にも優れるものとなる。
【００１３】
そこで、本発明の井型断面中空繊維は、横断面における全面積のうち突起部２の面積の割合が３０％以上、嵩高率が２０％以上であることが好ましい。突起部２の面積の割合が３０％未満であると、繊維全体に占める突起部の割合が少なくなり、井型断面中空繊維が持つ特性である、十分な嵩高性や保温性、撥水性といった機能が発現しにくくなる。突起部の面積の割合の上限は特に限定されるものではないが、６０％程度とすることが好ましい。面積の割合が６０％を超えると、繊維の形状の維持が難しくなりやすい。
【００１４】
嵩高率が２０％未満である場合、形成されるデッドエアー部が少なくなり、この繊維より得られた布帛は、嵩高性、保温性が不十分であり、軽量感にも乏しいものとなりやすい。嵩高率の上限は、特に限定されるものではないが、４０％程度とすることが好ましい。嵩高率が４０％を超えると、中空部が大きすぎる場合は中空割れの生じた繊維となりやすく、突起部が長すぎる場合は、繊維の形状の維持が難しくなり、また、得られた布帛の品位が低下しやすい。
【００１５】
本発明の井型断面中空繊維を構成する熱可塑性ポリマーには、繊維全体に対する割合で、酸化チタン微粒子を０．１〜１０．０重量％、好ましくは０．３〜１．０重量％含有されている。
酸化チタン微粒子の含有量が0.1 重量％未満であると、十分な艶消し効果が得られない。一方、含有量が10.0重量％を超えると艶消し効果が飽和するだけでなく、紡糸性が悪化し、繊維の強度及び形態の安定性が低下しやすくなる。
【００１６】
井型断面中空繊維においては、酸化チタン微粒子を含まない場合のＦ／Ｆμｄは2.9 〜3.0 程度であり、酸化チタン微粒子を0.5 重量％程度含有した場合のＦ／Ｆμｄは2.5 〜2.7 程度である。
【００１７】
そして、酸化チタン微粒子の含有量が0.3 重量％を超えると、糸と糸の間の摩擦係数が低くなるために、巻き取り時にパッケージ端面での綾落ちが発生するようになる。しかしながら、酸化チタン含有量が0.3 重量％以上であっても、糸／糸−動摩擦係数であるＦ／Ｆμｄの値を2.9 以上とすれば、巻き取り時の綾落ちを防ぐことが可能となる。
【００１８】
そこで、Ｆ／Ｆμｄを、酸化チタン微粒子を含む場合においても、酸化チタン微粒子を含まない場合と同様の程度にまで上げる具体的な方法としては、トリイソステアリルトリメリテートを成分として含む油剤を繊維表面に付与する方法が有効である。
トリイソステアリルトリメリテートを油剤成分として付与することにより、Ｆ／Ｆμｄを上げることができ、これにより、従来の紡糸巻取設備及び条件を用いて本発明の井型断面中空繊維を綾落ちなく巻き取ることができる。
【００１９】
トリイソステアリルトリメリテートは、油剤成分の５重量％以上、さらには１０〜２５重量％含有されていることが好ましい。
そして、油剤の付着量は、繊維全体に対して1.0 重量％以上、さらには、1.2 〜3.0 重量％であることが好ましい。油剤の付着量が1.0 重量％未満ではＦ／Ｆμｄを上げる効果が不十分で、かつ油剤付着量不足による毛羽発生などが起こりやすくなる。一方、3.0 重量％を超えると、コストが高くなり、また巻き取りローラへの油剤付着による汚れや紡糸性の悪化などが発生しやすくなる。
【００２０】
なお、本発明で使用する酸化チタン微粒子は、平均粒径が0.6 μｍ以下のものが好ましく、さらには0.4 μｍ以下のものがよい。平均粒径が0.6 μｍを超えると、紡糸工程においてろ材の目詰まりが生じやすく、これに起因して糸切れが生じやすくなる。
【００２１】
このように、本発明の井型断面中空繊維は、酸化チタン微粒子を繊維全体の0.1 〜10.0重量％含有することによって、光沢が3.0 級以下の繊維となる。
ここでいう光沢とは、評価する繊維の丸編み地を作成し、酸化チタン微粒子を0.3 重量％含有する60ｄ／16ｆの丸断面繊維を１級、酸化チタン微粒子を含まない60ｄ／16ｆの井型断面中空繊維の光沢を５級とし、光沢が強いほど判定級が大きくなるように光沢の強さを目視にて５段階評価したものである。
【００２２】
中空でない、通常の丸断面形状の繊維において、酸化チタン微粒子を含まない場合の光沢は4.0 級程度であり、酸化チタン微粒子を0.05重量％程度含む場合の光沢の値は1.5 〜2.0 級程度である。これに対し、井型断面中空繊維においては、酸化チタン微粒子を0.05重量％程度含有した場合においても光沢は4.0 級程度であり、これを本発明のように酸化チタン微粒子を0.1 重量％以上含有させると、光沢が3.0 級以下の繊維とすることができる。
このように光沢が3.0 級以下の繊維とすることで、得られる布帛は単糸断面形状による強い光沢感が抑えられ、優れた艶消し効果を有するものとなる。
【００２３】
本発明の井型断面中空繊維は、合成繊維の製造の常法に従い、溶融紡糸装置を用いて製造することができる。まず、酸化チタン微粒子を0.1 〜10.0重量％含有する熱可塑性樹脂を溶融紡糸し、紡糸糸条を冷却した後、トリイソステアリルトリメリテートを含む油剤を付与し、直接紡糸延伸法により、2000ｍ／分以上の速度で巻き取る。または、冷却した糸条を延伸することなく未延伸状態で一旦巻き取り、この糸条を再度ローラ間で延伸しながら巻き取る。
【００２４】
生産性よく製造するためには、直接紡糸延伸法による高速溶融紡糸法を用いることが望ましいが、紡糸速度が速いと、糸条表面に酸化チタン微粒子が析出しやすく、繊維のＦ／Ｆμｄが低下しやすい。しかしながら、トリイソステアリルトリメリテートを含む油剤を付与すれば、直接紡糸延伸法によっても本発明の繊維のＦ／Ｆμｄが2.9 以上の井型断面中空繊維を得ることができる。
【００２５】
【実施例】
次に、実施例により本発明を具体的に説明する。
なお、繊維の強伸度、断面形状及び巻き取りパッケージの綾落ちの測定は次のようにして行い、繊維の嵩高率、光沢及びＦ／Ｆμｄの測定や評価は前記の方法で行った。
〔強伸度〕
得られた繊維について、島津製作所製オートグラフＡＧＳ−５０Ｄを用い、試料長25cm、引っ張り速度25cm／分で測定した。
〔繊維の断面形状〕
ニコン社製マイクロフォトＳ光学顕微鏡に顕微鏡写真撮影装置を取り付け、５本の単糸について、単糸の横断面形状を撮影し、突起部の面積の割合を算出し、その平均値とした。
〔綾落ち〕
得られた繊維について、巻き径20cm（内、紙管径10.8cm）の巻き取りパッケージにおける端面の綾落ちの個数を数え、下記の基準で綾落ちの程度を評価した。
○：端面の綾落ち個数が３個未満
△：端面の綾落ち個数が３個以上10個未満
×：端面の綾落ち個数が10個以上
〔風合い〕
得られた繊維を丸編機を用いて編地にし、この編地の嵩高性と軽量感について、触感により判定し、３段階（優れているものから○、△、×）で評価した。
【００２６】
実施例１
平均粒径0.4 μｍの酸化チタン微粒子を0.5 重量％含有する相対粘度（96％硫酸を溶媒とし、濃度１ｇ／dl、温度25℃で測定した。）3.51のナイロン６ペレットをエクストルーダーに供給し、紡糸温度261 ℃で溶融紡糸した。そして、表１に示すようにトリイソステアリルトリメリテート成分を含有する油剤を付与した後にローラ間で延伸を施し、4150ｍ／分の速度で巻き取り、図１に示すような井型断面形状の中空繊維（60ｄ／16ｆ）を得た。
【００２７】
【表１】

【００２８】
比較例１
酸化チタン微粒子を含有していない相対粘度3.51のナイロン６ペレットを用い、付与する油剤を表２に示すようにトリイソステアリルトリメリテート成分を含有していないものにした以外は、実施例１と同様にして行った。
【００２９】
【表２】

【００３０】
実施例２〜３、比較例２〜４
酸化チタン微粒子の含有量、油剤の付着量、付与する油剤の種類を表３に示す値に種々変更した以外は、実施例１と同様にして行った。
【００３１】
実施例１〜３、比較例１〜４で得られた繊維の強伸度、繊維横断面における突起部の割合、嵩高率、光沢、Ｆ／Ｆμｄ、摩擦係数、綾落ち、風合いの評価を表３に示す。
【００３２】
【表３】

【００３３】
表３より明らかなように、実施例１〜３の繊維は、十分な強伸度を持ち、巻き取りパッケージも、綾落ちのない良好な巻き姿のものとすることができた。また、この繊維から得られた布帛は、光沢が抑えられ、嵩高性等の風合いも優れていた。
一方、比較例１、２の繊維は、酸化チタン微粒子の含有量が少なすぎたため、突起部における外部からの入射光の反射による強い光沢感が抑制しきれず、得られた布帛も光沢の強いものであった。比較例３の繊維は酸化チタン微粒子の含有量が多すぎたため、強伸度及び嵩高率が低下し、得られた布帛も風合いの劣ったものであった。また、比較例４の繊維は、トリイソステアリルトリメリテートを含有していない油剤が付与されていたため、Ｆ／Ｆμｄが低くなりすぎ、巻き取りパッケージは多数の綾落ちが生じた。このため、このパッケージは解舒性が悪く、得られた布帛は品位に劣るものであった。
【００３４】
【発明の効果】
本発明の繊維は、井型断面繊維特有の軽量感、嵩高性、保温性、撥水性などに優れると同時に、特有の光沢が抑えられて優れた艶消し効果を有し、かつ摩擦係数が高く、巻き取り時に綾落ちがなく良好に巻き取ることが可能である。
【図面の簡単な説明】
【図１】本発明の井型断面中空繊維の一実施態様を示す断面模式図である。
【図２】本発明の井型断面中空繊維の嵩高率の算出方法を示す断面模式図である。
【図３】本発明の井型断面中空糸のＦ／Ｆμｄを測定する装置の模式図である。
【符号の説明】
１中空部
２突起部
３四角形部
４糸送りローラ
５動滑車
６荷重（初荷重Ｔ１部）
７糸撚り合わせガイド（糸撚り合わせ部）
８テンションメーター（Ｔ２応力検出部）
９糸送りローラ[0001]
BACKGROUND OF THE INVENTION
The present invention is a well-shaped cross-section hollow fiber that is excellent in lightness, bulkiness, heat retention, water repellency, etc., has a unique texture, has an excellent matting effect with reduced gloss, and is excellent The present invention relates to a well-shaped hollow fiber that can be wound up.
[0002]
[Prior art]
Well-shaped cross-section hollow fibers have been developed as hollow fibers having high added value in synthetic fibers (Japanese Patent Laid-Open Nos. 8-27936 and 10-110324). This fiber has a unique single yarn cross-sectional shape called a well-shaped cross section, has a unique texture, and is highly lightweight due to the dead air part formed by the hollow part and the dead air part formed between the single yarns by the projection part In addition, it has bulkiness and heat retention, and is excellent in water repellency because of its low contact area with water droplets by the protrusions.
[0003]
However, since this fiber has a special single yarn cross-sectional shape called a well-shaped cross section, the incident light from the outside is reflected by the protrusions on the outer periphery of the single yarn cross section and exhibits a fairly strong and unique luster. However, there is a problem that the appearance of the fiber product is damaged and it is difficult to use.
[0004]
In general, in order to suppress the glossiness of the synthetic fiber, a method of containing titanium oxide fine particles in a thermoplastic polymer is performed.
However, in the case of a well-shaped cross-section fiber, the addition of a small amount of fine titanium oxide particles cannot sufficiently suppress the reflection of light that occurs at the protrusion on the outer periphery of the single yarn cross section. Increasing the amount of titanium oxide fine particles makes it possible to suppress the reflection of light, but the tensile strength and shape stability of the fiber tends to decrease, and the titanium oxide fine particles protrude from the surface of the single yarn, Since the contact area between the yarns is reduced and the coefficient of friction is lowered, there is a problem in that the winding end face occurs at the end of the package during winding.
[0005]
In particular, the hollow fiber having a well-shaped cross section has a very small contact area and a small friction coefficient compared to a normal round cross-section fiber or the like because the yarn and the yarn come into contact with each other at the protrusion on the outer periphery of the single yarn. For this reason, the friction coefficient is remarkably lowered due to an increase in the amount of titanium oxide fine particles added, and the occurrence of traversing at the package end face becomes remarkable.
[0006]
[Problems to be solved by the invention]
The present invention solves the above-mentioned problems, and by containing titanium oxide fine particles, the gloss is suppressed and has an excellent matting effect, and the friction coefficient is high, and there is no falling during winding. It is a technical problem to provide a well-shaped cross-section hollow fiber that can be wound.
[0007]
[Means for Solving the Problems]
The inventors of the present invention have arrived at the present invention as a result of intensive studies to solve the above problems. That is, the present invention is a hollow fiber that is formed of a thermoplastic polymer and has a well-shaped surface shape having two projecting portions that are substantially perpendicular to each corner of a quadrangular portion whose cross-sectional shape has a hollow portion near the central portion. In addition, titanium oxide fine particles are contained in an amount of 0.1 to 10.0% by weight of the whole fiber, and an oil agent containing triisostearyl trimellitate is applied to the fiber surface by 1.0% by weight or more of the whole fiber, and the yarn / yarn dynamic friction of the fiber. The gist is a well-shaped cross-section hollow fiber having a coefficient (F / Fμd) of 2.9 or more.
[0008]
In addition, the yarn / yarn dynamic friction coefficient (F / Fμd) of the fiber in the present invention was measured using a measuring apparatus as shown in FIG. The yarn runs between the yarn feed rollers 4 and 9 at a speed of 100 m / min, the initial load T1 = 10 g (load W = 20 g) is applied to the movable pulley 5 to run the yarn, and the yarn is guided 3 times with the guide 7 Twist together. The stress T2 (g) after twisting of the yarn was measured with a tension meter 8, and the ratio of the stress T2 to the initial load T1 was determined by F / Fμd = T2 / T1.
[0009]
The bulkiness ratio refers to the ratio of the area of the dead air part formed by the hollow part and the protrusion part in the cross section. The measuring method is that a microphoto S optical microscope manufactured by Nikon Corporation is attached, and a cross-sectional shape of the single yarn is photographed with respect to five single yarns. As shown in the schematic cross-sectional view of FIG. And the value of the area B is calculated as follows, and the average value of five is obtained.
Bulkiness ratio (%) = [(Area A) / (Area A + Area B)] × 100
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Next, the present invention will be described in detail.
As the thermoplastic polymer constituting the well-shaped cross-section hollow fiber of the present invention, polyamide, polyethylene terephthalate, polybutylene terephthalate, etc., mainly composed of nylon 6, nylon 11, nylon 12, nylon 46, nylon 66, nylon 610, etc. Examples thereof include polyolefins mainly containing polyester, polyethylene, polypropylene and the like as main components.
In particular, when a polyamide centering on nylon 6 is used as a thermoplastic polymer, it is possible to obtain fibers with a unique dry touch texture not found in conventional polyamide fibers.
[0011]
Next, the shape of the fiber of the present invention will be described with reference to the drawings. FIG. 1 is a schematic cross-sectional view showing one embodiment of a well-shaped cross-section hollow fiber of the present invention.
The fiber of the present invention has a quadrilateral cross-sectional shape, and a well-shaped cross-sectional shape having two protrusions 2 that are substantially perpendicular to each corner of a square portion 3 of a hollow fiber having a hollow portion 1 near the center. It presents.
[0012]
Thus, by exhibiting a well-shaped cross-sectional shape, when each single yarn overlaps as a multifilament yarn, a large number of hollow portions (dead air portions) are formed by the protrusions of each single yarn, which is bulky. It becomes a fiber with excellent properties and heat retention. Furthermore, the appearance of a large number of protrusions on the surface of the fiber also leads to excellent bulkiness and water repellency.
[0013]
Therefore, in the well-shaped cross-section hollow fiber of the present invention, it is preferable that the ratio of the area of the protrusions 2 is 30% or more and the bulk ratio is 20% or more of the total area in the cross section. When the ratio of the area of the protrusions 2 is less than 30%, the ratio of the protrusions to the entire fiber is reduced, and functions such as sufficient bulkiness, heat retention, and water repellency, which are characteristics of the well-shaped hollow fiber. Becomes difficult to express. The upper limit of the ratio of the area of the protrusion is not particularly limited, but is preferably about 60%. If the area ratio exceeds 60%, it is difficult to maintain the shape of the fiber.
[0014]
When the bulkiness ratio is less than 20%, the number of dead air portions to be formed is reduced, and the fabric obtained from this fiber is insufficient in bulkiness and heat retention and tends to be poor in lightness. The upper limit of the bulkiness rate is not particularly limited, but is preferably about 40%. When the bulkiness ratio exceeds 40%, if the hollow portion is too large, it becomes easy to form a fiber having a hollow crack, and if the protrusion is too long, it is difficult to maintain the shape of the fiber, and the quality of the obtained fabric Is prone to decline.
[0015]
The thermoplastic polymer constituting the well-shaped cross-section hollow fiber of the present invention contains 0.1 to 10.0% by weight, preferably 0.3 to 1.0% by weight, of titanium oxide fine particles in a ratio to the whole fiber. ing.
When the content of the titanium oxide fine particles is less than 0.1% by weight, a sufficient matting effect cannot be obtained. On the other hand, when the content exceeds 10.0% by weight, not only the matting effect is saturated, but also the spinnability is deteriorated, and the stability of the strength and form of the fiber tends to be lowered.
[0016]
In the well-shaped cross-section hollow fiber, F / Fμd when titanium oxide fine particles are not included is about 2.9 to 3.0, and F / Fμd when titanium oxide fine particles are contained about 0.5% by weight is about 2.5 to 2.7.
[0017]
When the content of the titanium oxide fine particles exceeds 0.3% by weight, the coefficient of friction between the yarns becomes low, so that the end face of the package will fall when wound. However, even when the content of titanium oxide is 0.3% by weight or more, if the value of F / Fμd, which is a yarn / yarn-dynamic friction coefficient, is set to 2.9 or more, it becomes possible to prevent the falling during winding.
[0018]
Therefore, as a specific method for raising F / Fμd to the same level as when titanium oxide fine particles are not contained even when titanium oxide fine particles are contained, an oil agent containing triisostearyl trimellitate as a component is used as a fiber. A method of applying to the surface is effective.
By adding triisostearyl trimellitate as an oil agent component, F / Fμd can be increased, thereby preventing the well-shaped cross-section hollow fiber of the present invention from falling over using conventional spinning winding equipment and conditions. Can be wound up.
[0019]
Triisostearyl trimellitate is preferably contained in an amount of 5% by weight or more, more preferably 10 to 25% by weight of the oil component.
And the adhesion amount of an oil agent is 1.0 weight% or more with respect to the whole fiber, Furthermore, it is preferable that it is 1.2 to 3.0 weight%. If the adhesion amount of the oil agent is less than 1.0% by weight, the effect of increasing F / Fμd is insufficient, and fluffing due to the insufficient adhesion amount of the oil agent easily occurs. On the other hand, if it exceeds 3.0% by weight, the cost increases, and dirt and spinnability are liable to occur due to adhesion of the oil to the take-up roller.
[0020]
The titanium oxide fine particles used in the present invention preferably have an average particle size of 0.6 μm or less, and more preferably 0.4 μm or less. When the average particle diameter exceeds 0.6 μm, the filter medium is likely to be clogged in the spinning process, and thread breakage is likely to occur due to this.
[0021]
Thus, the well-shaped cross-section hollow fiber of the present invention contains a titanium oxide fine particle in an amount of 0.1 to 10.0% by weight of the entire fiber, and thus becomes a fiber having a gloss of 3.0 or less.
The gloss here refers to a circular knitted fabric of fibers to be evaluated, a 60d / 16f round cross-section fiber containing 0.3% by weight of titanium oxide fine particles, and a 60d / 16f well type containing no titanium oxide fine particles. The gloss of the cross-section hollow fiber is grade 5, and the strength of the gloss is visually evaluated in five stages so that the judgment grade increases as the gloss increases.
[0022]
In a non-hollow fiber with a normal round cross section, the gloss when the fine particles of titanium oxide are not included is about 4.0 grade, and the gloss value when the fine particles of titanium oxide are contained about 0.05% by weight is about 1.5 to 2.0 grade. . On the other hand, the well-shaped cross-section hollow fiber has a gloss of about 4.0 grade even when the titanium oxide fine particles are contained in an amount of about 0.05% by weight, and this contains 0.1% by weight or more of the titanium oxide fine particles as in the present invention. Thus, it is possible to obtain a fiber having a gloss of 3.0 or less.
Thus, by using fibers having a gloss of 3.0 grade or less, the resulting fabric can suppress the strong glossiness due to the single yarn cross-sectional shape, and has an excellent matting effect.
[0023]
The well-shaped cross-section hollow fiber of the present invention can be produced using a melt spinning apparatus in accordance with a conventional method for producing synthetic fibers. First, a thermoplastic resin containing 0.1 to 10.0% by weight of titanium oxide fine particles was melt-spun, the spun yarn was cooled, an oil agent containing triisostearyl trimellitate was applied, and 2000 m / h was obtained by a direct spinning drawing method. Wind up at a speed of more than a minute. Alternatively, the cooled yarn is wound up in an undrawn state without being drawn, and the yarn is taken up while being drawn again between rollers.
[0024]
In order to produce with good productivity, it is desirable to use a high-speed melt spinning method based on the direct spinning drawing method. However, if the spinning speed is high, titanium oxide fine particles are likely to precipitate on the surface of the yarn, and the F / Fμd of the fiber decreases. It's easy to do. However, if an oil containing triisostearyl trimellitate is added, a well-shaped cross-section hollow fiber having an F / Fμd of the fiber of the present invention of 2.9 or more can be obtained even by direct spinning drawing.
[0025]
【Example】
Next, the present invention will be described specifically by way of examples.
In addition, the measurement of the high elongation of a fiber, a cross-sectional shape, and the fall of a winding package was performed as follows, and the measurement and evaluation of the bulkiness rate, glossiness, and F / Fμd of a fiber were performed by the above-mentioned method.
[Strong elongation]
The obtained fiber was measured with a sample length of 25 cm and a pulling speed of 25 cm / min using an autograph AGS-50D manufactured by Shimadzu Corporation.
[Cross-sectional shape of fiber]
A microphotograph photographing apparatus was attached to a Nikon Microphoto S optical microscope, and the cross-sectional shape of the single yarn was photographed for five single yarns, and the ratio of the area of the protrusions was calculated and taken as the average value.
[Falling down]
For the obtained fibers, the number of end faces in the winding package having a winding diameter of 20 cm (including a paper tube diameter of 10.8 cm) was counted, and the degree of twill was evaluated according to the following criteria.
○: The number of end faces is less than 3 Δ: The number of end faces is 3 or more and less than 10 ×: The number of end faces is 10 or more [texture]
The obtained fiber was made into a knitted fabric using a circular knitting machine, and the bulkiness and lightness of the knitted fabric were judged by tactile sensation and evaluated in three stages (from excellent to ○, Δ, ×).
[0026]
Example 1
Nylon 6 pellets with a relative viscosity (measured at a concentration of 1 g / dl and a temperature of 25 ° C. using 96% sulfuric acid as a solvent) containing 0.5% by weight of titanium oxide fine particles having an average particle diameter of 0.4 μm were supplied to the extruder. Melt spinning was carried out at a spinning temperature of 261 ° C. Then, as shown in Table 1, after applying an oil containing a triisostearyl trimellitate component, it was stretched between rollers, wound up at a speed of 4150 m / min, and had a well-shaped cross section as shown in FIG. Hollow fibers (60d / 16f) were obtained.
[0027]
[Table 1]

[0028]
Comparative Example 1
Example 1 except that nylon 6 pellets having a relative viscosity of 3.51 not containing titanium oxide fine particles were used and the oil agent to be applied did not contain a triisostearyl trimellitate component as shown in Table 2. The same was done.
[0029]
[Table 2]

[0030]
Examples 2-3 and Comparative Examples 2-4
This was carried out in the same manner as in Example 1 except that the content of the titanium oxide fine particles, the adhesion amount of the oil agent, and the type of oil agent to be applied were variously changed to the values shown in Table 3.
[0031]
Table 1 shows the evaluation of the strength and elongation of the fibers obtained in Examples 1 to 3 and Comparative Examples 1 to 4, the ratio of protrusions in the cross section of the fiber, bulkiness, gloss, F / Fμd, friction coefficient, twill, and texture. 3 shows.
[0032]
[Table 3]

[0033]
As can be seen from Table 3, the fibers of Examples 1 to 3 had sufficient strength and elongation, and the winding package could have a good winding shape without falling. Moreover, the fabric obtained from this fiber was suppressed in gloss and excellent in texture such as bulkiness.
On the other hand, since the fibers of Comparative Examples 1 and 2 contained too little titanium oxide fine particles, strong glossiness due to reflection of incident light from the outside at the protrusions could not be suppressed, and the resulting fabrics were also highly glossy Met. Since the fiber of Comparative Example 3 contained too much titanium oxide fine particles, the strength and bulkiness ratio decreased, and the resulting fabric was inferior in texture. In addition, since the fiber of Comparative Example 4 was provided with an oil agent that did not contain triisostearyl trimellitate, F / Fμd was too low, and the winding package had a lot of falling. For this reason, this package had poor unraveling properties, and the resulting fabric was inferior in quality.
[0034]
【The invention's effect】
The fibers of the present invention are excellent in the lightness, bulkiness, heat retention, water repellency, etc. specific to the well-shaped cross-section fibers, and at the same time have a special matte suppression and an excellent matting effect, and a high coefficient of friction. It is possible to wind up well without winding down during winding.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view showing one embodiment of a well-shaped cross-section hollow fiber of the present invention.
FIG. 2 is a schematic cross-sectional view showing a method for calculating the bulk ratio of the well-shaped cross-section hollow fiber of the present invention.
FIG. 3 is a schematic view of an apparatus for measuring F / F μd of a well-shaped cross-section hollow fiber of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Hollow part 2 Protrusion part 3 Square part 4 Yarn feed roller 5 Moving pulley 6 Load (initial load T1 part)
7 Yarn twisting guide (yarn twisting part)
8 Tension meter (T2 stress detector)
9 Yarn feed roller

Claims

A hollow fiber made of a thermoplastic polymer and having a well-shaped surface shape having two projecting portions that are substantially perpendicular to each corner of a quadrangular portion having a hollow cross section in the vicinity of the center portion, and comprising titanium oxide Oil containing 0.1 to 10.0% by weight of fine particles and containing triisostearyl trimellitate is applied to the fiber surface by 1.0% by weight or more of the whole fiber, and the yarn / thread dynamic friction coefficient (F / Fμd) of the fiber A well-shaped hollow fiber having a cross-section of 2.9 or more.

The well-shaped cross-section hollow fiber according to claim 1, wherein the proportion of the area of the protrusions is 30% or more and the bulkiness ratio is 20% or more of the total area in the cross-sectional shape of the fiber.