JP2020165029A - Sea-island type composite fiber bundle and surface uneven fiber bundle made therefrom - Google Patents
Sea-island type composite fiber bundle and surface uneven fiber bundle made therefrom Download PDFInfo
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- 239000000835 fiber Substances 0.000 title claims abstract description 153
- 239000002131 composite material Substances 0.000 title claims abstract description 84
- 229920000642 polymer Polymers 0.000 claims abstract description 47
- 238000004519 manufacturing process Methods 0.000 claims abstract description 9
- 230000007547 defect Effects 0.000 claims description 14
- 238000007599 discharging Methods 0.000 claims description 4
- 230000002093 peripheral effect Effects 0.000 claims description 4
- 238000009987 spinning Methods 0.000 claims description 4
- 239000012670 alkaline solution Substances 0.000 claims description 3
- 239000003513 alkali Substances 0.000 abstract description 10
- 239000007864 aqueous solution Substances 0.000 abstract description 9
- 230000004580 weight loss Effects 0.000 abstract description 8
- 238000000034 method Methods 0.000 abstract description 4
- 239000000243 solution Substances 0.000 abstract description 2
- 238000000926 separation method Methods 0.000 abstract 1
- 239000004744 fabric Substances 0.000 description 14
- 239000012510 hollow fiber Substances 0.000 description 11
- -1 polyethylene terephthalate Polymers 0.000 description 10
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 9
- 229920000728 polyester Polymers 0.000 description 8
- 239000002202 Polyethylene glycol Substances 0.000 description 7
- 229920001223 polyethylene glycol Polymers 0.000 description 7
- 229920000139 polyethylene terephthalate Polymers 0.000 description 7
- 239000005020 polyethylene terephthalate Substances 0.000 description 7
- 229920002292 Nylon 6 Polymers 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 4
- 239000011148 porous material Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 description 3
- 239000002585 base Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000004090 dissolution Methods 0.000 description 3
- 239000000155 melt Substances 0.000 description 3
- 238000002074 melt spinning Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 239000004953 Aliphatic polyamide Substances 0.000 description 2
- 229920000305 Nylon 6,10 Polymers 0.000 description 2
- 229920002302 Nylon 6,6 Polymers 0.000 description 2
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- 230000015572 biosynthetic process Effects 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000001953 sensory effect Effects 0.000 description 2
- YZTJKOLMWJNVFH-UHFFFAOYSA-N 2-sulfobenzene-1,3-dicarboxylic acid Chemical compound OC(=O)C1=CC=CC(C(O)=O)=C1S(O)(=O)=O YZTJKOLMWJNVFH-UHFFFAOYSA-N 0.000 description 1
- 229920000219 Ethylene vinyl alcohol Polymers 0.000 description 1
- 229920001283 Polyalkylene terephthalate Polymers 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- 229920002978 Vinylon Polymers 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 125000002723 alicyclic group Chemical group 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 206010061592 cardiac fibrillation Diseases 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007334 copolymerization reaction Methods 0.000 description 1
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- 238000009826 distribution Methods 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 239000004715 ethylene vinyl alcohol Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000002600 fibrillogenic effect Effects 0.000 description 1
- 239000006081 fluorescent whitening agent Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- RZXDTJIXPSCHCI-UHFFFAOYSA-N hexa-1,5-diene-2,5-diol Chemical compound OC(=C)CCC(O)=C RZXDTJIXPSCHCI-UHFFFAOYSA-N 0.000 description 1
- 229920001903 high density polyethylene Polymers 0.000 description 1
- 239000004700 high-density polyethylene Substances 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
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- 229920001179 medium density polyethylene Polymers 0.000 description 1
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- 238000002156 mixing Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 125000005487 naphthalate group Chemical group 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920003207 poly(ethylene-2,6-naphthalate) Polymers 0.000 description 1
- 229920001281 polyalkylene Polymers 0.000 description 1
- 229920001515 polyalkylene glycol Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920001707 polybutylene terephthalate Polymers 0.000 description 1
- 239000011112 polyethylene naphthalate Substances 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 229920002215 polytrimethylene terephthalate Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 239000006097 ultraviolet radiation absorber Substances 0.000 description 1
- 239000002759 woven fabric Substances 0.000 description 1
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- Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
Abstract
Description
本発明は、繊維の表面に斑のないフィブリル調の風合いを有する表面凹凸繊維束及びその製造方法に関する。 The present invention relates to a surface uneven fiber bundle having a fibril-like texture without spots on the surface of the fiber and a method for producing the same.
従来、織編物表面に毛羽状外観を付与する方法として、有機スルホン酸金属塩などを添加配合したポリエステルからなる繊維を織編物となし、織編物表面にアルカリ水溶液による加水分解処理を施してバッフィング処理を行うか、若しくはバッフィング処理を施した後アルカリ加水分解処理を行うことにより、ポリエステル繊維をミクロフィブリル化して織編物表面に毛羽を形成せしめる方法が開示されている（例えば、特許文献１参照）。 Conventionally, as a method of imparting a fluffy appearance to the surface of a woven or knitted fabric, a fiber made of polyester to which an organic sulfonic acid metal salt or the like is added is formed as a woven or knitted fabric, and the surface of the woven or knitted fabric is hydrolyzed with an alkaline aqueous solution and buffed. A method is disclosed in which polyester fibers are microfibrillated to form fluff on the surface of a woven or knitted fabric by performing an alkali hydrolysis treatment after performing a buffing treatment or a buffing treatment (see, for example, Patent Document 1).
しかし、ポリエステルに非相溶である有機スルホン酸金属塩やポリアルキレングリコール類などをブレンドして得られるポリエステル繊維では、有機スルホン酸金属塩などのポリエステル繊維内での分散状態をコントロールすることが難しく、織編物を構成する繊維間でフィブリル化の程度に斑が生じ、織編物の表面に筋状の斑が発生し、織物品位が劣化するという問題があった。そこでフィブリル調を有する斑の少ない繊維が求められていた。 However, in polyester fibers obtained by blending organic sulfonic acid metal salts and polyalkylene glycols that are incompatible with polyester, it is difficult to control the dispersed state in the polyester fibers such as organic sulfonic acid metal salts. There is a problem that spots are generated in the degree of fibrillation between the fibers constituting the woven or knitted fabric, streaky spots are generated on the surface of the woven or knitted fabric, and the quality of the woven fabric is deteriorated. Therefore, there has been a demand for fibers having a fibril tone and few spots.
本発明の目的は、均一な表面凹凸を有するフィブリル調を有する表面凹凸繊維束及びその製造方法に関する。 An object of the present invention relates to a fibril-like surface uneven fiber bundle having uniform surface unevenness and a method for producing the same.
上記の問題を解決するために鋭意検討した結果、本発明に達した。すなわち、本発明によれば、
１．海島型複合繊維において、島成分を易溶解ポリマーとし、海成分を難溶解ポリマーとした海島複合繊維で、島成分直径をｒとすると、海島型複合繊維の外周と最外層の島成分の間隔ｄが０≦ｄ＜０．５ｒとなる海島型複合繊維束、
２．前記１記載の海島型複合繊維束で、島成分直径ｒが５０〜５０００ｎｍとなる海島型複合繊維束、そして、
３．前記１、または２記載の海島型複合繊維束をアルカリ溶液で減量加工した際に、繊維横断面方向において、最外層の海ポリマーが欠損しることによって形成された凹凸を有する表面凹凸繊維束で、その欠損数が最外周の島数をｎとした際にｎ／２以上である凹凸を有する表面凹凸繊維束、
４．前記３記載の凹凸を有する表面凹凸繊維束において、凹凸部の高さｈが０．５ｒ＜ｈ＜ｒとなる凹凸部を有する表面凹凸繊維束
５．繊維横断面方向において、更に表面から内部にかけて複数の中空を有する前記３、または４記載の表面凹凸繊維束であり、
さらには、
６．前記１、または２記載の海島型複合繊維束の製造方法であって、口金の外周と最外層の島成分の間隔は海島型複合繊維束の島成分を吐出する最外周孔と中心までの距離ｘと海島型複合繊維を集合させる孔と中心までの距離Ｘの差が−２ｒ＜Ｘ−ｘ＜４ｒである口金を用いて紡糸することを特徴とする海島型複合繊維束の製造方法、である。
The present invention has been reached as a result of diligent studies to solve the above problems. That is, according to the present invention.
1. 1. In the sea-island type composite fiber, the island component is an easily soluble polymer and the sea component is a poorly soluble polymer. Assuming that the island component diameter is r, the distance between the outer periphery of the sea-island type composite fiber and the outermost island component d A sea-island type composite fiber bundle in which 0 ≦ d <0.5r,
2. The sea-island type composite fiber bundle according to 1 above, the sea-island type composite fiber bundle having an island component diameter r of 50 to 5000 nm, and
3. 3. When the sea-island type composite fiber bundle according to 1 or 2 is weight-reduced with an alkaline solution, the surface uneven fiber bundle having irregularities formed by the loss of the sea polymer in the outermost layer in the cross-sectional direction of the fiber. , A surface uneven fiber bundle having irregularities whose number of defects is n / 2 or more when the number of islands on the outermost circumference is n.
4. 5. In the surface uneven fiber bundle having the unevenness described in 3 above, the surface uneven fiber bundle having the uneven portion having a height h of the uneven portion of 0.5 r <h <r. The surface uneven fiber bundle according to the above 3 or 4, which has a plurality of hollows from the surface to the inside in the fiber cross-sectional direction.
Furthermore,
6. In the method for producing a sea-island type composite fiber bundle according to the above 1 or 2, the distance between the outer periphery of the mouthpiece and the island component of the outermost layer is the distance between the outermost peripheral hole for discharging the island component of the sea-island type composite fiber bundle and the center. A method for producing a sea-island type composite fiber bundle, which comprises spinning using a mouthpiece in which the difference between the hole for collecting x and the sea-island type composite fiber and the distance X to the center is -2r <X-x <4r. is there.
繊維表面の凹凸が均一な繊維束を製造でき、それを含む布帛は、斑が少なく品位の高いフィブリル調の風合いを呈することができる。更には、海島型複合繊維の島成分を更に内部方向にも設けて減量することで、表面凹凸と多孔中空部を兼備する軽量かつソフトな風合いを布帛に賦与する表面凹凸多孔中空繊維束を提供することができる。 A fiber bundle having uniform irregularities on the fiber surface can be produced, and the fabric containing the fiber bundle can exhibit a high-quality fibril-like texture with few spots. Furthermore, by further providing the island component of the sea-island type composite fiber in the internal direction to reduce the weight, a surface uneven porous hollow fiber bundle that imparts a lightweight and soft texture having both surface unevenness and a porous hollow portion to the fabric is provided. can do.
以下、本発明の実施の形態について詳細に説明する。 Hereinafter, embodiments of the present invention will be described in detail.
本発明の海島型複合繊維束は、溶解性の異なる２種類のポリマーからなり、繊維横断面において易溶解ポリマーを島成分、難溶解ポリマーを海成分として複合化した海島型複合繊維束からなる。以下、島成分を構成する易溶解ポリマーを島成分ポリマー、海成分を構成する難溶解ポリマーを海成分ポリマーと称することがある。ここで、繊維束とは、織編物などの布帛は、数本の単糸からなるマルチフィラメントの形で使用されるため、マルチフィラメントの意味として、単糸と区別するために用いている。 The sea-island type composite fiber bundle of the present invention is composed of two kinds of polymers having different solubility, and is composed of a sea-island type composite fiber bundle in which an easily soluble polymer is used as an island component and a poorly soluble polymer is used as a sea component in the cross section of the fiber. Hereinafter, the easily soluble polymer constituting the island component may be referred to as an island component polymer, and the poorly soluble polymer constituting the sea component may be referred to as a sea component polymer. Here, the fiber bundle is used to distinguish a fabric such as a woven or knitted fabric from a single yarn as a meaning of the multifilament because it is used in the form of a multifilament composed of several single yarns.
前記の海成分ポリマーは、島成分ポリマーよりアルカリ水溶液に対する減量速度が１／２００倍、好ましくは１／３００倍と十分に遅い条件を満たしていれば何を用いてもよい。好ましく用いられる海ポリマーの例としては、ポリエチレンテレフタレート、ポリトリメチレンテレフタレート、ポリブチレンテレフタレート、ポリエチレンナフタレート、ポリブチレンナフタレート等に代表されるポリアルキレンテレフタレートまたはポリアルキレンナフタレートおよびそれらに第３成分を共重合したポリエステル系ポリマー、ポリアミド６、ポリアミド６６、ポリアミド６１０などの脂肪族ポリアミド、脂環族ポリアミド、高密度ポリエチレン、中密度ポリエチレン、線状低密度ポリエチレン、低密度ポリエチレン、アイソタクチックポリプロピレン、エチレン−プロピレン共重合体、ポリスチレン等のポリオレフィンらが挙げられる。 Any sea component polymer may be used as long as it satisfies the condition that the weight loss rate with respect to the alkaline aqueous solution is 1/200 times, preferably 1/300 times that of the island component polymer. Examples of preferably used sea polymers include polyalkylene terephthalates or polyalkylene naphthalates typified by polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate and the like, and a third component thereof. Copolymerized polyester polymer, aliphatic polyamide such as polyamide 6, polyamide 66, polyamide 610, alicyclic polyamide, high density polyethylene, medium density polyethylene, linear low density polyethylene, low density polyethylene, isotactic polypropylene, ethylene -Protein copolymers, polyolefins such as polystyrene and the like can be mentioned.
更には、後述する、繊維内部にも多孔中空を形成させ、軽量性やソフトな風合いを付与する表面凹凸多孔中空繊維とするには、海成分に、公定水分率が３％以上のポリマーを選択することが好ましい。ここで「公定水分率」とは、ＪＩＳ Ｌ ０１０５：２００６で定義された通常の状態で繊維が有する繊維質量と絶乾時の繊維質量の差を通常の状態で繊維が有する繊維質量で割った値である。海成分ポリマーの公定水分率が３％未満のポリマーである場合、海島型複合繊維束をアルカリ水溶液でアルカリ減量処理して表面凹凸多孔中空繊維束を製造するにあたり、複合繊維の中心付近の島成分ポリマーを溶解除去することが困難となり、結果として、中空率や中空孔の数が減少することとなる。 Furthermore, in order to form a porous hollow fiber inside the fiber, which will be described later, to obtain a surface uneven porous hollow fiber that imparts lightness and a soft texture, a polymer having an official moisture content of 3% or more is selected as the sea component. It is preferable to do so. Here, the "official moisture content" is defined by dividing the difference between the fiber mass of the fiber in the normal state and the fiber mass in the absolute dry state as defined in JIS L 0105: 2006 by the fiber mass of the fiber in the normal state. The value. When the official moisture content of the sea component polymer is less than 3%, the island component near the center of the composite fiber is produced by alkali-reducing the sea-island type composite fiber bundle with an alkaline aqueous solution to produce a surface uneven porous hollow fiber bundle. It becomes difficult to dissolve and remove the polymer, and as a result, the hollow ratio and the number of hollow holes are reduced.
また、海成分ポリマーは、海島型複合繊維束のアルカリ水溶液処理時の海成分ポリマーの劣化、損傷を回避するために、耐アルカリ性はなるべく高いことが好ましい。前記の海成分ポリマーの、耐アルカリ性の要件とは、１００℃、濃度４０ｇ／ｌ、処理時間１時間の条件での水酸化ナトリウム水溶液による減量率が１０％以下であるポリマーが好ましい。 Further, the sea component polymer preferably has as high an alkali resistance as possible in order to avoid deterioration and damage of the sea component polymer during treatment with an alkaline aqueous solution of the sea island type composite fiber bundle. The alkali resistance requirement of the sea component polymer is preferably a polymer having a weight loss rate of 10% or less with an aqueous sodium hydroxide solution under the conditions of 100 ° C., a concentration of 40 g / l, and a treatment time of 1 hour.
前記の公定水分率が３％以上である耐アルカリ性ポリマーとしては、ナイロン６、ナイロン６６、ナイロン６１０等の脂肪族ポリアミド、ビニロン、エチレンビニルアルコ−ル系共重合体等が好適である。また、これらの海成分ポリマーの重合度は、一般衣料用に用いられる範囲内であり、繊維形成が可能な範囲であればよい。なお、これらの海成分ポリマーには酸化チタン等の艶消剤、顔料、蛍光増白剤、紫外線吸収剤、酸化防止剤等の通常の繊維用添加剤を加えて用いてもよい。 As the alkali-resistant polymer having the official moisture content of 3% or more, aliphatic polyamides such as nylon 6, nylon 66 and nylon 610, vinylon, ethylene vinyl alcohol-based copolymers and the like are suitable. Further, the degree of polymerization of these sea component polymers may be within the range used for general clothing and may be within the range in which fiber formation is possible. In addition, a matting agent such as titanium oxide, a pigment, a fluorescent whitening agent, an ultraviolet absorber, an antioxidant and other ordinary fiber additives may be added to these sea component polymers.
前記の島成分ポリマーは、アルカリ水溶液への溶解性および良好な島形状成型性を有する必要がある。好ましい例としては、ポリエチレングリコール系化合物と５−ナトリウムスルホイソフタル酸の共重合ポリエステル等を用いることができる。具体的には、５−ナトリウムスルホイソフタル酸６〜１２モル％と分子量４０００〜１２０００のポリエチレングリコールを２〜１０質量％共重合させた、固有粘度が０．３〜０．６ｄＬ／ｇのポリエチレンテレフタレート系共重合ポリエステルが好ましい。ここで、５−ナトリウムスルホイソフタル酸は親水性とアルカリ減量性（島成分溶解除去速度）向上に寄与し、ポリエチレングリコール（ＰＥＧ）は親水性を向上させ、かつ樹脂粘度を低下する作用がある。 The island component polymer needs to have solubility in an alkaline aqueous solution and good island shape moldability. As a preferable example, a copolymerized polyester of a polyethylene glycol-based compound and 5-sodium sulfoisophthalic acid can be used. Specifically, polyethylene terephthalate having an intrinsic viscosity of 0.3 to 0.6 dL / g obtained by copolymerizing 6 to 12 mol% of 5-sodium sulfoisophthalic acid and polyethylene glycol having a molecular weight of 4000 to 12000 by 2 to 10% by mass. Copolymerized polyester is preferable. Here, 5-sodium sulfoisophthalic acid contributes to the improvement of hydrophilicity and alkali weight loss (island component dissolution / removal rate), and polyethylene glycol (PEG) has the effect of improving hydrophilicity and lowering the resin viscosity.
５−ナトリウムスルホイソフタル酸が６モル％未満であると島成分ポリマーの溶解速度が遅くなるため好ましくない。また一方１２モル％を超えると、固有粘度が低下し、紡糸性が悪くなるので好ましくない。また、ＰＥＧ共重合量が２質量％未満であると島海成分ポリマーの溶解速度が遅くなり、かつポリマーの粘度が高くなることで、海島型複合繊維の形成ができなくなる。一方、１０質量％を超えると、溶融粘度の低下作用が著しくなり、繊維成型が困難となる。 If the amount of 5-sodium sulfoisophthalic acid is less than 6 mol%, the dissolution rate of the island component polymer becomes slow, which is not preferable. On the other hand, if it exceeds 12 mol%, the intrinsic viscosity is lowered and the spinnability is deteriorated, which is not preferable. Further, if the amount of PEG copolymerization is less than 2% by mass, the dissolution rate of the island-sea component polymer becomes slow and the viscosity of the polymer becomes high, so that the sea-island type composite fiber cannot be formed. On the other hand, if it exceeds 10% by mass, the effect of lowering the melt viscosity becomes remarkable, and fiber molding becomes difficult.
前記の海島型複合繊維を構成する海成分ポリマーの質量比率は、目的に応じて選定されるが、図５記載の口金を用いて紡糸され、図６記載のような表面のみに凹凸を出すことを目的とした海島型複合繊維の場合は９９．５〜８０質量％が好ましい。より好ましくは９９〜８５質量％、更に好ましくは９８〜９０質量％である。図５記載のように表面のみにアルカリ減量によって溶解除去されうる島成分が１列〜数列存在すれば、フィブリル調の表面凹凸を得ることが可能であるから、島成分の質量比率は小さくてもよい。なお、フィブリル調を得るために必要な島数は１０〜２０００であり、好ましくは１５〜１０００、更に好ましくは２０〜８００である。また、島成分直径（ｒ）については、５０〜５０００ｎｍの範囲であり、好ましくは１００〜３０００ｎｍ、更に好ましくは１５０〜１５００ｎｍである。このｒの範囲を外れると、いずれも品位のよいフィブリル調外観が得られない。 The mass ratio of the sea component polymer constituting the sea-island type composite fiber is selected according to the purpose, but it is spun using the mouthpiece shown in FIG. 5, and unevenness is produced only on the surface as shown in FIG. In the case of a sea-island type composite fiber for the purpose of, 99.5 to 80% by mass is preferable. It is more preferably 99 to 85% by mass, still more preferably 98 to 90% by mass. As shown in FIG. 5, if there are one to several rows of island components that can be dissolved and removed by reducing the amount of alkali only on the surface, it is possible to obtain fibril-like surface irregularities, so even if the mass ratio of the island components is small. Good. The number of islands required to obtain a fibril tone is 10 to 2000, preferably 15 to 1000, and more preferably 20 to 800. The island component diameter (r) is in the range of 50 to 5000 nm, preferably 100 to 3000 nm, and more preferably 150 to 1500 nm. If it is out of the range of r, a high-quality fibril-like appearance cannot be obtained.
また、図４記載の口金を用いて図３記載のような表面凹凸と繊維内部に多孔中空部を有する繊維を得ることを目的とした図２記載のような海島型複合繊維の場合は、海成分ポリマーの質量比率は、２０〜８０質量％が好ましい。好ましくは２５〜７５質量％、更に好ましくは３０〜７０質量％である。海成分の割合が２０質量％より小さくなると、海成分を溶解後に中空部がつぶれてしまい、軽量性や吸水性、柔軟性が失われることから好ましくない。一方、海成分の割合が８０質量％より大きい場合は、中空部が小さく、望ましい軽量性や吸水性、柔軟性が得られない。 Further, in the case of a sea-island type composite fiber as shown in FIG. 2 for the purpose of obtaining a fiber having surface irregularities and a porous hollow portion inside the fiber as shown in FIG. 3 using the mouthpiece shown in FIG. 4, the sea The mass ratio of the component polymer is preferably 20 to 80% by mass. It is preferably 25 to 75% by mass, more preferably 30 to 70% by mass. If the proportion of the sea component is smaller than 20% by mass, the hollow portion is crushed after the sea component is dissolved, and lightness, water absorption, and flexibility are lost, which is not preferable. On the other hand, when the proportion of the sea component is larger than 80% by mass, the hollow portion is small, and the desired light weight, water absorption, and flexibility cannot be obtained.
前記の島成分ポリマーと海成分ポリマーを用いた海島型複合繊維の、溶融紡糸時における海成分の溶融粘度は島成分ポリマーの溶融粘度よりも大きいことが好ましい。かかる関係にある場合には、島成分の複合質量比率が８０質量％以上となっても、島成分同士が接合したり、島成分の大部分が接合して海島型複合繊維とは異なるものになり難い。 It is preferable that the melt viscosity of the sea component at the time of melt spinning of the sea-island type composite fiber using the island component polymer and the sea component polymer is larger than the melt viscosity of the island component polymer. In such a relationship, even if the composite mass ratio of the island components is 80% by mass or more, the island components are bonded to each other or most of the island components are bonded to be different from the sea-island type composite fiber. It's hard to be.
好ましい溶融粘度比（海／島）は、０．１〜６．０、より好ましくは０．２〜４．０の範囲である。この比が０．１倍未満の場合も６．０倍を越える場合も、粘度差が大きすぎるために溶融紡糸時に海と島の形成が不安定になるので、紡糸調子が低下しやすい。 The preferred melt viscosity ratio (sea / island) is in the range of 0.1 to 6.0, more preferably 0.2 to 4.0. When this ratio is less than 0.1 times or more than 6.0 times, the viscosity difference is too large and the formation of sea and islands becomes unstable during melt spinning, so that the spinning condition tends to decrease.
なお、表面凹凸と内部多孔中空構造を併せ持つ場合に、適度な島数の範囲は５０〜１００００であることが好ましく、より好ましくは７０〜９０００、更に好ましくは９０〜８０００である。ここで、島数５０未満の場合は、口金の島成分挿入の配置にもよるが、望ましいフィブリル調の表面凹凸や内部多孔中空による軽量性、吸水性、ソフトな風合いを得ることが難くなる。また、島数が多くなりすぎると紡糸口金の製造コストが高くなる、繊維束の総繊度が大きくなり、布帛のソフトさが劣る、等といったデメリットが生じる。 When the surface unevenness and the internal perforated hollow structure are combined, the range of an appropriate number of islands is preferably 50 to 10000, more preferably 70 to 9000, and further preferably 90 to 8000. Here, when the number of islands is less than 50, it becomes difficult to obtain light weight, water absorption, and a soft texture due to the desirable fibril-like surface unevenness and internal perforated hollow, although it depends on the arrangement of the island component insertion of the base. Further, if the number of islands is too large, the manufacturing cost of the spinneret becomes high, the total fineness of the fiber bundle becomes large, and the softness of the fabric is inferior.
また、島成分直径（ｒ）については、５０〜５０００ｎｍの範囲であり、好ましくは１００〜３０００ｎｍ、更に好ましくは１５０〜１５００ｎｍである。このｒの範囲を外れると、いずれも品位のよいフィブリル調外観が得られず、また、内部多孔中空による軽量性、吸水性、柔軟性が中空のないものに比べての差が小さくなる。 The island component diameter (r) is in the range of 50 to 5000 nm, preferably 100 to 3000 nm, and more preferably 150 to 1500 nm. If it is out of this range of r, a high-quality fibril-like appearance cannot be obtained, and the difference in lightness, water absorption, and flexibility due to the internal perforated hollow becomes smaller than that of the non-hollow one.
なお、島成分の形状は何ら限定されず、円形でも楕円形でもその他の異形形状でもよい。また、島成分直径をｒとすると、海島型複合繊維の外周と最外層の島成分の間隔ｄが０≦ｄ＜０．５ｒであり、好ましくは０≦ｄ≦０．３５ｒ、より好ましくは０≦ｄ≦０．２ｒとすることが好ましい。（図２参照）
海島型複合繊維の外周と最外層の島成分の間隔がｄ≧０．５ｒとなった場合、海島型複合繊維外径の欠損による凸凹が生じることが困難となり、均一なフィブリル調風合いを得ることが難しい。
The shape of the island component is not limited in any way, and may be circular, elliptical, or other irregular shape. Further, assuming that the island component diameter is r, the distance d between the outer periphery of the sea-island type composite fiber and the island component of the outermost layer is 0 ≦ d <0.5r, preferably 0 ≦ d ≦ 0.35r, and more preferably 0. It is preferable that ≦ d ≦ 0.2r. (See Fig. 2)
When the distance between the outer circumference of the sea-island type composite fiber and the island component of the outermost layer is d ≧ 0.5r, it becomes difficult for unevenness to occur due to the defect of the outer diameter of the sea-island type composite fiber, and a uniform fibril-like texture is obtained. Is difficult.
この海島型複合繊維の外周と最外層の島成分の間隔は、海島型複合繊維の島成分を吐出する最外周孔と中心までの距離ｘと海島型複合繊維を集合させる孔と中心までの距離Ｘの差によって制御することができ、−２ｒ＜Ｘ−ｘ＜４ｒの範囲とすることが好ましい。（図１参照）
Ｘ−ｘが−２ｒ以下となると、最外周の島成分ポリマー同士が融着し、凹凸を生じず柔らかなフィブリル調の風合いを得ることができない。またＸ−ｘが４ｒ以上となる場合、海島型複合繊維の外周と最外層の島成分の間隔が大きくなり、海島型複合繊維外径の欠損による凸凹が生じることがなく、ソフトなフィブリル調風合いを得ることが難しい。
The distance between the outer periphery of the sea-island type composite fiber and the island component of the outermost layer is the distance x between the outermost peripheral hole for discharging the island component of the sea-island type composite fiber and the center, and the distance between the hole for assembling the sea-island type composite fiber and the center. It can be controlled by the difference in X, and is preferably in the range of -2r <X-x <4r. (See Fig. 1)
When XX is -2r or less, the outermost island component polymers are fused to each other, and unevenness is not generated and a soft fibril-like texture cannot be obtained. Further, when XX is 4r or more, the distance between the outer circumference of the sea-island type composite fiber and the island component of the outermost layer becomes large, and unevenness due to the defect of the outer diameter of the sea-island type composite fiber does not occur, and a soft fibril-like texture is obtained. Is difficult to obtain.
加えて、海島型複合繊維の単糸繊度は０．３〜５ｄｔｅｘとすることが望ましい。単糸繊度が０．３ｄｔｅｘより小さいと、糸切れせず巻き取ることが難しく安定した生産が困難である。また、単糸繊度が５ｄｔｅｘを超える場合、アルカリ減量をして中空繊維束を作製しても、ソフトな風合いを有する布帛とならず、好ましくない。 In addition, it is desirable that the single yarn fineness of the sea-island type composite fiber is 0.3 to 5 dtex. If the single yarn fineness is less than 0.3 dtex, it is difficult to wind the yarn without breaking it, and stable production is difficult. Further, when the single yarn fineness exceeds 5 dtex, even if the hollow fiber bundle is produced by reducing the amount of alkali, the fabric does not have a soft texture, which is not preferable.
また、本発明の表面凹凸繊維束は、アルカリ減量前の海島型複合繊維の最外周の島数をｎとした際にその欠損数がｎ／２以上となることが好ましい。欠損数がｎ／２未満であればフィブリル調に斑や分布が生じ、品位や風合いが損なわれる。ここで、欠損とは海島型複合繊維を減量後、島成分の最外周部分が減量された際、最外周島成分を取り囲む海成分がなくなることで海島型複合繊維の表面に凹凸を生じることである。このときの減量後の海島型複合繊維の糸断面の例として図３があげられる。 Further, the surface uneven fiber bundle of the present invention preferably has a loss number of n / 2 or more when the number of islands on the outermost circumference of the sea-island type composite fiber before alkali weight loss is n. If the number of defects is less than n / 2, spots and distributions occur in a fibril tone, and the quality and texture are impaired. Here, the defect is that when the outermost portion of the island component is reduced after the weight of the sea-island type composite fiber is reduced, the sea component surrounding the outermost island component disappears and the surface of the sea-island type composite fiber becomes uneven. is there. FIG. 3 shows an example of the thread cross section of the sea-island type composite fiber after the weight loss at this time.
さらに、繊維表面の凹凸部の高さｈが０．５ｒ＜ｈ＜ｒとなることが望ましい。（図３参照）
ｈが０．５ｒ以下の場合は柔らかなフィブリル調の風合いを得ることができない。また表面凹凸部の高さは海島型複合繊維の島成分直径に依存することからｒ以上に大きくすることは難しい。
Further, it is desirable that the height h of the uneven portion on the fiber surface is 0.5r <h <r. (See Fig. 3)
When h is 0.5r or less, a soft fibril-like texture cannot be obtained. Further, since the height of the surface uneven portion depends on the island component diameter of the sea-island type composite fiber, it is difficult to increase it to r or more.
以下、実施例をあげて本発明をさらに具体的に説明する。各評価項目は下記の方法で測定した。
（１）公定水分率
ＪＩＳ Ｌ ０１０５：２００６に従い、通常の状態で繊維が有する繊維質量と絶乾時の繊維質量の差を通常の状態で繊維が有する繊維質量で割った値から算出した。
（２）島成分直径（ｒ）
海島型複合繊維を繊維長方向と垂直の方向に繊維断面を切断し、繊維断面を３０，０００倍でＴＥＭ観察により、１本の複合繊維内の中空孔直径を測定し、その３０点平均から島成分直径を測定した。
（３）海島型複合繊維の外周と最外層の島成分の間隔（ｄ）
海島型複合繊維を繊維長方向と垂直の方向に繊維断面を切断し、繊維断面を３０，０００倍でＴＥＭ観察により、１本の複合繊維内の繊維外周と最外層島成分の間隔を測定し、その３０点平均から島成分直径を測定した。この時０≦ｄ＜０．５ｒとなる場合が良好とした。
（４）表面凹凸高さ（ｈ）
海島型複合繊維をアルカリ減量して得た表面凹凸繊維束を繊維長方向と垂直の方向に繊維断面を切断し、繊維断面を３０，０００倍でＴＥＭ観察により、１本の複合繊維内の凹部高さｈ（ｎｍ）を測定し、全数〜最大３０点平均から平均凹部高さ（ｈ）を測定した。このとき、０．５ｒ＜ｈ＜ｒとなる場合が良好とした。
（５）表面凹凸の欠損率
海島型複合繊維をアルカリ溶液で減量加工した際に、繊維横断面方向において、最外層の海ポリマーが欠損することによって形成された、凹凸を有する表面凹凸繊維束で、その欠損数が最外周の島数をｎとした際にｎ／２（５０％）以上となれば良好とした。
（６）フィブリル調官能試験
実施例、比較例で得られた表面凹凸（多孔中空）繊維束を４００回／ｍの撚りを掛け、経緯使いの平織り組織で製織し、８０℃で精錬・リラックス処理、１６０℃・４５秒でプレセット乾熱処理を行った。ついで１２０℃・３０分で染色を行い、自然乾燥した後、１６０℃・４５秒でファイナルセットを行い、フィブリル調を有するかどうか５人の検査員により官能検査を行った。４人以上の検査員がフィブリル調を有するとした場合〇、３人以下の人がフィブリル調を有するとした場合は×とした。
Hereinafter, the present invention will be described in more detail with reference to examples. Each evaluation item was measured by the following method.
(1) Official Moisture Ratio According to JIS L 0105: 2006, it was calculated from the value obtained by dividing the difference between the fiber mass of the fiber in the normal state and the fiber mass in the absolute dry state by the fiber mass of the fiber in the normal state.
(2) Island component diameter (r)
A fiber cross section is cut from a sea-island type composite fiber in a direction perpendicular to the fiber length direction, and the hollow hole diameter in one composite fiber is measured by TEM observation at a fiber cross section of 30,000 times, and the average of 30 points is used. The island component diameter was measured.
(3) Spacing between the outer circumference of the sea-island type composite fiber and the island component of the outermost layer (d)
The sea-island type composite fiber is cut in the fiber cross section in the direction perpendicular to the fiber length direction, and the distance between the outer periphery of the fiber and the outermost island component in one composite fiber is measured by TEM observation at a fiber cross section of 30,000 times. , The island component diameter was measured from the 30-point average. At this time, the case where 0 ≦ d <0.5r was considered to be good.
(4) Surface unevenness height (h)
The surface uneven fiber bundle obtained by reducing the amount of the sea-island type composite fiber by alkali is cut in the fiber cross section in the direction perpendicular to the fiber length direction, and the fiber cross section is 30,000 times as large as TEM observation, and the concave portion in one composite fiber. The height h (nm) was measured, and the average recess height (h) was measured from the average of all to a maximum of 30 points. At this time, the case where 0.5r <h <r was considered to be good.
(5) Defect rate of surface irregularities A bundle of surface irregularities with irregularities formed by the loss of the outermost sea polymer in the cross-sectional direction of the fibers when the sea-island type composite fiber is weight-reduced with an alkaline solution. It was considered good if the number of defects was n / 2 (50%) or more when the number of islands on the outermost circumference was n.
(6) Fibril-like sensory test The surface uneven (porous hollow) fiber bundles obtained in Examples and Comparative Examples are twisted 400 times / m, woven with a plain weave structure using warp and weft, and refined and relaxed at 80 ° C. , 160 ° C. for 45 seconds, preset dry heat treatment. Then, dyeing was performed at 120 ° C. for 30 minutes, air-dried, and then a final set was performed at 160 ° C. for 45 seconds, and a sensory test was performed by five inspectors to see if they had a fibril tone. If 4 or more inspectors have a fibril tone, 0, and if 3 or less people have a fibril tone, x.
［実施例１］
海成分に公定水分率４．５％、Ｔｇ４７℃のポリアミド６（Ｎｙ６）を用い、島成分に平均分子量４０００のポリエチレングリコール（ＰＥＧ）を３質量％、５−ナトリウムスルホイソフタル酸（ＳＩＰ）を９ｍｏｌ％共重合したポリエチレンテレフタレート（ＰＥＴ共重合１）を用いて、島数９０／１フィラメント、最外周の島成分数は３０島、２４フィラメント、Ｘ−ｘ＝２ｒとなる海島型紡糸口金（図４参照）を用いて溶融紡糸し、１０００ｍ／ｍｉｎで巻取りを行い３倍に延伸を行った。この時、島成分と海成分ポリマーの質量吐出比は５０：５０であった。得られた海島型複合繊維束の外周と最外層の島成分の間隔（ｄ）は２００ｎｍであり、島成分の直径は１２００ｎｍ、海島型複合繊維束の総繊度は５６ｄｔｅｘ／２４フィラメント（単糸繊度２．３ｄｔｅｘ）であった。その後３．５質量％、８０℃の水酸化ナトリウム水溶液へ４０分間浸漬し、島成分ポリマーを溶解した。得られた表面凹凸多孔中空繊維束は中空率５０％であり、中空孔径は１２００ｎｍ、表面に高さ１０００ｎｍの凹凸を有していた。また表面凹凸多孔中空繊維束の欠損率は８０％であった。５人の検査員がフィブリル調を有していると判定した。詳細は表１に示す。
[Example 1]
Polyamide 6 (Ny6) with an official moisture content of 4.5% and Tg 47 ° C. was used as the sea component, 3% by mass of polyethylene glycol (PEG) having an average molecular weight of 4000 was used as the island component, and 9 mol of 5-sodium sulfoisophthalic acid (SIP). Using% copolymerized polyethylene terephthalate (PET copolymer 1), the number of islands is 90/1 filament, the number of island components on the outermost circumference is 30 islands, 24 filaments, and X-x = 2r. (See) was melt-spun, wound at 1000 m / min, and stretched three times. At this time, the mass discharge ratio of the island component and the sea component polymer was 50:50. The distance (d) between the outer circumference of the obtained sea-island type composite fiber bundle and the island component of the outermost layer is 200 nm, the diameter of the island component is 1200 nm, and the total fineness of the sea-island type composite fiber bundle is 56 dtex / 24 filaments (single yarn fineness). It was 2.3 dtex). Then, it was immersed in a 3.5 mass%, 80 ° C. sodium hydroxide aqueous solution for 40 minutes to dissolve the island component polymer. The obtained surface-concavo-convex porous hollow fiber bundle had a hollow ratio of 50%, a hollow pore diameter of 1200 nm, and a surface irregularity of 1000 nm in height. The defect rate of the surface uneven porous hollow fiber bundle was 80%. Five inspectors determined to have a fibril tone. Details are shown in Table 1.
［実施例２］
Ｘ−ｘ＝ｒとなる、島数３０／１フィラメント、最外周の島成分数は３０島、２４フィラメントを用いた以外は海島型紡糸口金（図５参照）を用いて溶融紡糸し、実施例１と同様の方法で海島複合繊維束を作製した。海島型複合繊維束の外周と最外層の島成分の間隔（ｄ）は１００ｎｍであり、島成分の直径は２０００ｎｍ、海島型複合繊維束の総繊度は５６ｄｔｅｘ／２４フィラメント（単糸繊度２．３ｄｔｅｘ）であった。結果、得られた表面凹凸繊維束の中空率０％であり、表面に高さ１５００ｎｍの凹凸を有しており、欠損率は９０％であった。５人の検査員がフィブリル調を有していると判定した。詳細は表１に示す。
[Example 2]
Examples include melt spinning using a sea-island type spinneret (see FIG. 5) except that XX = r, the number of islands is 30/1 filament, the number of island components on the outermost circumference is 30 islands, and 24 filaments are used. A sea-island composite fiber bundle was prepared in the same manner as in 1. The distance (d) between the outer circumference of the sea-island type composite fiber bundle and the island component of the outermost layer is 100 nm, the diameter of the island component is 2000 nm, and the total fineness of the sea-island type composite fiber bundle is 56 dtex / 24 filaments (single yarn fineness 2.3 dtex). )Met. As a result, the hollow ratio of the obtained surface uneven fiber bundle was 0%, the surface had irregularities with a height of 1500 nm, and the defect rate was 90%. Five inspectors determined to have a fibril tone. Details are shown in Table 1.
［比較例１］
Ｘ−ｘ＝５ｒとなる、島数９０／１フィラメント、最外周の島成分数は３０島、２４フィラメントを用いた以外は実施例１と同様の方法で海島型複合繊維束を作製した。海島型複合繊維束の外周と最外層の島成分の間隔（ｄ）は１０００ｎｍであり、島成分の直径は１２００ｎｍ、海島型複合繊維束の総繊度は５６ｄｔｅｘ／２４フィラメント（単糸繊度２．３ｄｔｅｘ）であった。結果、得られた表面凹凸多孔中空繊維束は中空率５０％であり、中空孔径は１２００ｎｍであったが、表面に凹凸を有しておらず、欠損率は０％であり、５人の検査員がフィブリル調を有していないと判定した。詳細は表１に示す。
[Comparative Example 1]
A sea-island type composite fiber bundle was produced in the same manner as in Example 1 except that 90/1 filaments having 90/1 islands, 30 islands on the outermost circumference, and 24 filaments were used, where XX = 5r. The distance (d) between the outer circumference of the sea-island type composite fiber bundle and the island component of the outermost layer is 1000 nm, the diameter of the island component is 1200 nm, and the total fineness of the sea-island type composite fiber bundle is 56 dtex / 24 filaments (single yarn fineness 2.3 dtex). )Met. As a result, the obtained surface-concavo-convex porous hollow fiber bundle had a hollow ratio of 50% and a hollow pore diameter of 1200 nm, but had no surface irregularities and a defect rate of 0%. It was determined that the member did not have a fibril tone. Details are shown in Table 1.
［比較例２］
Ｘ−ｘ＝２ｒとなる、島数９０／１フィラメント、最外周の島成分数は３０島、２４フィラメントを用い、海成分ポリマーに公定水分率４．５％、Ｔｇ４７℃のポリアミド６（Ｎｙ６）を用い、島成分に公定水分率０．４％のポリエチレンテレフタレート（ＰＥＴ）を用いた以外は、実施例１と同様の方法で海島複合繊維束を作製した。海島型複合繊維束の外周と最外層の島成分の間隔（ｄ）は２００ｎｍであり、島成分の直径は１２００ｎｍ、海島型複合繊維束の総繊度は５６ｄｔｅｘ／２４フィラメント（単糸繊度２．３ｄｔｅｘ）であった。その後、海島型複合繊維束を３．５質量％、８０℃の水酸化ナトリウム水溶液へ４０分間浸漬し、島成分ポリマーを溶解しようとしたが、質量減少は５％にとどまり、凹凸を有しておらず、欠損率は０％であり、５人の検査員がフィブリル調を有していないと判定した。詳細は表１に示す。
[Comparative Example 2]
Polyamide 6 (Ny6) having an official moisture content of 4.5% and a Tg of 47 ° C. was used as a sea component polymer using 90/1 filaments with 90/1 islands and 30 islands and 24 filaments on the outermost circumference with X-x = 2r. A sea-island composite fiber bundle was prepared in the same manner as in Example 1 except that polyethylene terephthalate (PET) having an official moisture content of 0.4% was used as the island component. The distance (d) between the outer circumference of the sea-island type composite fiber bundle and the island component of the outermost layer is 200 nm, the diameter of the island component is 1200 nm, and the total fineness of the sea-island type composite fiber bundle is 56 dtex / 24 filaments (single yarn fineness 2.3 dtex). )Met. After that, the sea-island type composite fiber bundle was immersed in a 3.5 mass%, 80 ° C. sodium hydroxide aqueous solution for 40 minutes to try to dissolve the island component polymer, but the mass reduction was only 5% and had irregularities. The defect rate was 0%, and 5 inspectors determined that they did not have a fibril tone. Details are shown in Table 1.
［実施例３］
Ｘ−ｘ＝ｒとなる、島数９０／１フィラメント、最外周の島成分数は３０島、２４フィラメントを用い、海成分ポリマーに公定水分率０．４％、Ｔｇ７０℃のポリエチレンテレフタレートを用いた以外は実施例１と同様の方法で海島複合繊維束を作製した。海島型複合繊維束の外周と最外層の島成分の間隔（ｄ）は１００ｎｍであり、島成分の直径は１２００ｎｍ、海島型複合繊維束の総繊度は５６ｄｔｅｘ／２４フィラメント（単糸繊度２．３ｄｔｅｘ）であった。結果、得られた表面凹凸多孔中空繊維束は中空率５０％であり、中空孔径は１２００ｎｍ、表面に高さ９００ｎｍの凹凸を有していた。また表面凹凸多孔中空繊維束の欠損率は７０％であった。５人の検査員がフィブリル調を有していると判定した。詳細は表１に示す。
[Example 3]
90/1 filaments with 90/1 islands and 30 islands and 24 filaments on the outermost circumference were used, and polyethylene terephthalate having an official moisture content of 0.4% and Tg of 70 ° C. was used as the sea component polymer. A sea-island composite fiber bundle was prepared in the same manner as in Example 1 except for the above. The distance (d) between the outer circumference of the sea-island type composite fiber bundle and the island component of the outermost layer is 100 nm, the diameter of the island component is 1200 nm, and the total fineness of the sea-island type composite fiber bundle is 56 dtex / 24 filaments (single yarn fineness 2.3 dtex). )Met. As a result, the obtained surface-concavo-convex porous hollow fiber bundle had a hollow ratio of 50%, a hollow pore diameter of 1200 nm, and a surface irregularity of 900 nm in height. The defect rate of the surface uneven porous hollow fiber bundle was 70%. Five inspectors determined to have a fibril tone. Details are shown in Table 1.
［実施例４］
Ｘ−ｘ＝０．５ｒとなる、島数８３６／１フィラメント、最外周の島成分数は３２島、１０フィラメントの図４に示す種類の口金を用い、海成分ポリマーの比率を３０質量％とした以外は実施例１と同様の方法で海島複合繊維束を作製した。海島型複合繊維束の外周と最外層の島成分の間隔（ｄ）は５０ｎｍであり、島成分の直径は７００ｎｍ、海島型複合繊維束の総繊度は５６ｄｔｅｘ／１０フィラメント（単糸繊度５．６ｄｔｅｘ）であった。結果、得られた表面凹凸繊維束は中空率７０％であり、中空孔径は７００ｎｍ、表面に高さ４００ｎｍの凹凸を有していた。また表面凹凸多孔中空繊維束の欠損率は１００％であり、５人の検査員がフィブリル調を有していると判定した。詳細は表１に示す。
[Example 4]
The number of islands is 836/1 filament with X-x = 0.5r, the number of island components on the outermost circumference is 32 islands, and 10 filaments of the type shown in FIG. 4 are used, and the ratio of the sea component polymer is 30% by mass. A sea-island composite fiber bundle was prepared in the same manner as in Example 1 except for the above. The distance (d) between the outer circumference of the sea-island type composite fiber bundle and the island component of the outermost layer is 50 nm, the diameter of the island component is 700 nm, and the total fineness of the sea-island type composite fiber bundle is 56 dtex / 10 filament (single yarn fineness 5.6 dtex). )Met. As a result, the obtained surface uneven fiber bundle had a hollow ratio of 70%, a hollow pore diameter of 700 nm, and an uneven surface having a height of 400 nm. Further, the defect rate of the surface uneven porous hollow fiber bundle was 100%, and five inspectors determined that it had a fibril tone. Details are shown in Table 1.
本発明の海島型複合繊維束の易溶解ポリマーからなる島成分をアルカリ水溶液によって溶解除去して得られる表面凹凸繊維は、布帛にした際、均一なフィブリル調の品位の高い外観を呈する。更には、繊維内部にも多孔中空部を付与することで、軽量感と柔軟な風合いを有する布帛や繊維構造体及びそれを用いた繊維製品を提供することができる。 The surface uneven fiber obtained by dissolving and removing the island component composed of the easily soluble polymer of the sea-island type composite fiber bundle of the present invention with an alkaline aqueous solution exhibits a uniform fibril-like high-quality appearance when made into a cloth. Furthermore, by imparting a porous hollow portion to the inside of the fiber, it is possible to provide a fabric or fiber structure having a lightweight feeling and a flexible texture, and a textile product using the same.
Ｘ：島型複合繊維を集合させる孔と中心までの距離
ｘ：海島型複合繊維の島成分を吐出する最外周孔と中心までの距離
ｄ：海島複合繊維の外周と最外層の島成分の間隔
ｒ：島成分直径
X: Distance between the hole for collecting the island-type composite fibers and the center x: Distance between the outermost hole and the center for discharging the island component of the sea-island type composite fiber d: Distance between the outer periphery and the outermost layer of the island component of the sea-island composite fiber r: Island component diameter
Claims (6)
０．５ｒ＜ｈ＜ｒ The surface uneven fiber bundle having the uneven portion according to claim 3, wherein the height h of the uneven portion has the following formula.
0.5r <h <r
The method for producing a sea-island type composite fiber bundle according to claim 1 or 2, wherein the distance between the outer peripheral surface of the mouthpiece and the island component of the outermost layer is between the outermost peripheral hole for discharging the island component of the sea-island type composite fiber bundle and the center. A method for producing a sea-island type composite fiber bundle, which comprises spinning using a mouthpiece in which the difference between the distance x and the distance X between the hole for collecting the sea-island type composite fibers and the distance X to the center is -2r <X-x <4r.
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