JP4589417B2 - Crimpable composite fiber, method for producing the same, and nonwoven fabric using the same - Google Patents

Crimpable composite fiber, method for producing the same, and nonwoven fabric using the same Download PDF

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JP4589417B2
JP4589417B2 JP2008043612A JP2008043612A JP4589417B2 JP 4589417 B2 JP4589417 B2 JP 4589417B2 JP 2008043612 A JP2008043612 A JP 2008043612A JP 2008043612 A JP2008043612 A JP 2008043612A JP 4589417 B2 JP4589417 B2 JP 4589417B2
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crimp
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洋志 岡屋
弘二 和気坂
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DaiwaboPolytecCo.,Ltd.
Daiwabo Holdings Co Ltd
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本発明は、主として嵩弾性に優れる不織布に適したポリエステル系捲縮性複合繊維、およびそれを用いた不織布に関する。   The present invention relates to a polyester-type crimpable conjugate fiber suitable mainly for a nonwoven fabric excellent in bulk elasticity, and a nonwoven fabric using the same.

近年、衛生材料、包装材、ウェットティッシュ、フィルター、ワイパー等に用いられる不織布、あるいは硬綿、椅子等に用いられる不織布、成形体など様々な用途において、低融点成分の少なくとも一部が繊維表面に露出し、低融点成分よりも融点が高い高融点成分からなる熱融着性複合繊維を用いた熱接着不織布が使用されている。なかでも、前記熱融着性複合繊維で得られた不織布の嵩弾性、すなわち厚み方向での嵩回復性に優れ、かつ、柔らかい触感を有する繊維の要求が、現在廃棄の問題となっているウレタンの代替の環境問題と相まって大きくなっている。   In recent years, in various applications such as sanitary materials, packaging materials, non-woven fabrics used in wet tissues, filters, wipers, etc., non-woven fabrics used in hard cotton, chairs, etc., molded products, at least a part of the low melting point component is on the fiber surface. A heat-bonded nonwoven fabric using a heat-fusible conjugate fiber composed of a high-melting component that is exposed and has a melting point higher than that of the low-melting component is used. Among them, the demand for fibers having excellent bulk elasticity of the nonwoven fabric obtained from the heat-fusible conjugate fiber, that is, bulk recovery in the thickness direction and having a soft tactile sensation, is currently a problem of disposal. Coupled with alternative environmental issues, it is growing.

現状、嵩弾性に優れた不織布を得るのに用いられている複合繊維としては、一般的にポリプロピレン(以下、PPと記す場合がある)/ポリエチレン(以下、PEと記す場合がある)、ポリエチレンテレフタレート(以下、PETと記す場合がある)/PE、ポリブチレンテレフタレート(以下、PBTと記す場合がある)/PEとする複合繊維が挙げられ、前記以外にも、ポリトリメチレンテレフタレート(以下、PTTと記す場合がある)を用いた繊維および不織布が挙げられており、例えば、特開平11-158732号公報(特許文献1)では、芯成分をポリエチレンテレフタレートなどのメチレン基のnが偶数であるジオール成分を縮重合したポリエステルとし、鞘成分をPTTなどのメチレン基のnが奇数であるジオール成分を縮重合したポリエステルとした偏心芯鞘型複合繊維が提案されている。特開平11-189923号公報(特許文献2)では、極限粘度が0.4〜1であるPTTと、他のポリエステルとをサイドバイサイド型に接合した複合繊維が提案されている。さらに、特開2000−256920号公報(特許文献3)には、PTTと、熱接着性成分としてポリオレフィンあるいは共重合ポリエステルとを用いた熱融着性複合繊維が提案されている。
特開平11-158732号公報 特開平11-189923号公報 特開2000−256920号公報
Currently, the composite fiber used to obtain a nonwoven fabric excellent in bulk elasticity is generally polypropylene (hereinafter sometimes referred to as PP) / polyethylene (hereinafter sometimes referred to as PE), polyethylene terephthalate. (Hereinafter, sometimes referred to as PET) / PE, polybutylene terephthalate (hereinafter, sometimes referred to as PBT) / PE, and composite fibers such as polytrimethylene terephthalate (hereinafter referred to as PTT) For example, in Japanese Patent Application Laid-Open No. 11-158732 (Patent Document 1), the core component is a diol component in which n of the methylene group such as polyethylene terephthalate is an even number. Is a polycondensed polyester, and the sheath component is a diol component with a methylene group n of odd numbers such as PTT. An eccentric core-sheath type composite fiber made of polymerized polyester has been proposed. Japanese Patent Application Laid-Open No. 11-189923 (Patent Document 2) proposes a composite fiber in which a PTT having an intrinsic viscosity of 0.4 to 1 and another polyester are joined in a side-by-side manner. Furthermore, Japanese Patent Application Laid-Open No. 2000-256920 (Patent Document 3) proposes a heat-fusible conjugate fiber using PTT and polyolefin or copolymer polyester as a heat-adhesive component.
Japanese Patent Laid-Open No. 11-158732 JP-A-11-189923 JP 2000-256920 A

しかしながら、前記繊維には次のような問題点を有する。例えば、PP/PE繊維で製造された不織布は、単繊維の曲げ強さが小さいため、風合いは柔らかいが、曲げ回復率も低いためへたりやすい傾向がある。PET/PE繊維は、PP/PE繊維に比べ単繊維の曲げ回復率が高いため、不織布に一定荷重かけ、除重した直後の嵩回復性(以下、初期嵩回復性と記す場合がある)は大きいが、単繊維の曲げ強さも大きいため、除重後24時間以降の嵩回復性(以下、長期嵩回復性と記す場合がある)は不十分であり、更に風合いが硬く感じるという問題がある。さらに、PBT/PE繊維は、単繊維の曲げ強さが小さく、曲げ回復率が高いため、不織布としたときの風合いが柔らかく、長期嵩回復性に優れているが、曲げ弾性率が低いため、初期嵩回復性がPP/PE同様に小さく、例えばオムツや椅子用クッション材など頻繁に荷重のかかる様な用途には使用が困難であるという問題がある。   However, the fiber has the following problems. For example, a non-woven fabric made of PP / PE fibers has a low bending strength of single fibers, so that the texture is soft, but the bending recovery rate is also low, so it tends to be sag. Since PET / PE fibers have a higher bending recovery rate of single fibers than PP / PE fibers, the bulk recoverability immediately after applying a certain load to the nonwoven fabric and dewetting (hereinafter sometimes referred to as initial bulk recoverability) is Although it is large, the bending strength of the single fiber is also large, so that the bulk recoverability after 24 hours after dewetting (hereinafter sometimes referred to as long-term bulk recoverability) is insufficient, and the texture feels harder. . Furthermore, since the PBT / PE fiber has a small bending strength of the single fiber and a high bending recovery rate, the texture when made into a nonwoven fabric is soft and excellent in long-term bulk recovery properties, but because the bending elastic modulus is low, The initial bulk recovery is as small as PP / PE, and there is a problem that it is difficult to use for applications such as diapers and chair cushions that are frequently loaded.

また、特開平11-158732号公報および特開平11-189923号公報では、PTT成分の収縮力を利用して、捲縮発現させているため、捲縮が細かくなりすぎ、伸縮性を得ることは可能であるが、嵩高性においては不十分である。 特開2000−256920号公報では、PTTの熱収縮を抑制し、高速カード性を高めるために、エチレングリコールの共重合比を減らしたり、融点を高めたり、あるいは同心円型の芯鞘型複合形態としたりしているが、初期嵩回復性および長期嵩回復性について十分に改善されているといえない。   In addition, in JP-A-11-158732 and JP-A-11-189923, crimping is expressed by using the shrinkage force of the PTT component, so that crimps are too fine and stretchability is obtained. Although possible, it is insufficient in bulkiness. In Japanese Patent Laid-Open No. 2000-256920, in order to suppress the thermal shrinkage of PTT and increase the high-speed card property, the copolymerization ratio of ethylene glycol is reduced, the melting point is increased, or a concentric core-sheath type composite form is used. However, it cannot be said that the initial bulk recovery and the long-term bulk recovery are sufficiently improved.

したがって、柔らかな風合いであり、初期嵩回復性、長期嵩回復性ともに優れた、特に頻繁に荷重のかかる用途に適した繊維が得られていないのが実情である。   Therefore, the actual condition is that a fiber having a soft texture and excellent in initial bulk recovery property and long-term bulk recovery property and particularly suitable for a frequently loaded application has not been obtained.

本発明は、上記問題点を鑑みてなされたものであり、ポリトリメチレンテレフタレート系樹脂を含有する第1成分と、ポリオレフィン系樹脂を含有する第2成分からなる複合繊維とし、延伸条件、鋸歯状捲縮付与条件、およびアニーリング処理条件を調整して、カード通過性が良好で、熱処理時に適度な波線状捲縮および/または螺旋状捲縮を発現するとともに第2成分の融点近傍の温度でも熱収縮を有しない捲縮性複合繊維とすることによって、上記課題を解決し、本発明に至った。すなわち、本発明の捲縮性複合繊維は、ポリトリメチレンテレフタレート系樹脂を含有する第1成分と、前記第1成分の融点よりも20℃以上融点が低いポリオレフィン系樹脂を含有する第2成分から構成され、繊維断面において第2成分が繊維表面の50〜100%を占め、第1成分の重心位置が繊維の重心位置からずれており、偏心率が5〜50%の複合繊維からなり、前記複合繊維は、捲縮数が7個/25mm以上、25個/25mm以下の鋸歯状捲縮と波線状捲縮が混在した捲縮、または鋸歯状捲縮と螺旋状捲縮が混在した捲縮を有しており、前記複合繊維は、第2成分の融点をTm(℃)としたとき、Tm−3(℃)において下記式(1)及び(2)の範囲を満たす波線状捲縮および螺旋状捲縮から選ばれた少なくとも一種の捲縮を有しており、Tm−3(℃)における乾熱収縮率が3%以下を満たすものである。
(1)0.8<L<5
(2)0.4<H/L<0.9
L:捲縮の一山間の長さ(mm)
H:捲縮の山の高さ(mm)
かかる構成を採ることにより、不織布としたとき、柔らかな風合いであり、収縮を伴わずとも、適度な波線状捲縮および/または螺旋状捲縮が発現して、初期嵩回復性、長期嵩回復性ともに優れた、特に頻繁に荷重のかかる不織布用途に適した捲縮性複合繊維が得られる。
The present invention has been made in view of the above problems, and is a composite fiber composed of a first component containing a polytrimethylene terephthalate-based resin and a second component containing a polyolefin-based resin. The crimping conditions and the annealing treatment conditions are adjusted so that the card passing property is good. Appropriate wavy crimps and / or spiral crimps are produced during the heat treatment, and heat is generated even at a temperature near the melting point of the second component. By using a crimped conjugate fiber that does not shrink, the above-mentioned problems have been solved and the present invention has been achieved. That is, the crimped conjugate fiber of the present invention includes a first component containing a polytrimethylene terephthalate resin and a second component containing a polyolefin resin having a melting point of 20 ° C. or more lower than the melting point of the first component. Configured, the second component occupies 50 to 100% of the fiber surface in the fiber cross section, the center of gravity of the first component is deviated from the center of gravity of the fiber, and consists of a composite fiber having an eccentricity of 5 to 50% , The composite fiber is a crimp with a combination of serrated crimps and wavy crimps with a crimp number of 7/25 mm or more and 25/25 mm or less, or a crimp with mixed sawtooth crimps and spiral crimps. The composite fiber has wavy crimps satisfying the ranges of the following formulas (1) and (2) at Tm-3 (° C.) when the melting point of the second component is Tm (° C.): At least one crimp selected from helical crimps It has, in which dry heat shrinkage at Tm-3 (℃) satisfies the 3%.
(1) 0.8 <L <5
(2) 0.4 <H / L <0.9
L: Length between crimped mountains (mm)
H: Height of crimped mountain (mm)
By adopting such a configuration, when it is made into a nonwoven fabric, it has a soft texture, and even without shrinkage, moderate wavy crimps and / or spiral crimps develop, and initial bulk recovery, long-term bulk recovery A crimpable conjugate fiber that is excellent in properties and particularly suitable for non-woven fabrics that are frequently loaded is obtained.

本発明の捲縮性複合繊維は、偏心率5〜50%の偏心芯鞘型複合繊維であると、乾熱収縮率を低く抑えながら、嵩回復性において有利な波線状捲縮および/または螺旋状捲縮を得ることができ好ましい。さらに、前記ポリオレフィン系樹脂は、高密度ポリエチレン、エチレン−プロピレン共重合体、およびエチレン−ブテン−1−プロピレン三元共重合体から選ばれた少なくとも1種であることが好ましい。   When the crimped conjugate fiber of the present invention is an eccentric core-sheath type conjugate fiber having an eccentricity of 5 to 50%, the wavy crimp and / or the spiral are advantageous in terms of bulk recovery property while keeping the dry heat shrinkage rate low. It is preferable because a crimp can be obtained. Furthermore, the polyolefin resin is preferably at least one selected from high-density polyethylene, ethylene-propylene copolymer, and ethylene-butene-1-propylene terpolymer.

本発明において、ポリトリメチレンテレフタレート系樹脂を含有する第1成分と、前記第1成分の融点よりも20℃以上融点が低いポリオレフィン系樹脂を含有する第2成分からなり、繊維断面において第2成分が繊維表面の50〜100%を占め、第1成分の重心位置が繊維の重心位置からずれるように配置された複合型ノズルを用いて溶融紡糸し、得られた紡糸フィラメントを延伸倍率1.8倍以上で延伸処理を施し、捲縮数5個/25mm以上、25個/25mm以下の鋸歯状捲縮を付与した後、温度90〜130℃の雰囲気下でアニーリング処理を施すことにより、捲縮数が7個/25mm以上、25個/25mm以下の鋸歯状捲縮と波線状捲縮が混在した捲縮、または鋸歯状捲縮と螺旋状捲縮が混在した捲縮とした複合繊維であり、
前記複合繊維の偏心率が5〜50%の複合繊維であり、
前記複合繊維における第2成分の融点をTm(℃)としたとき、Tm−3(℃)において下記式(1)及び(2)の範囲を満たす波線状捲縮および螺旋状捲縮から選ばれた少なくとも一種の捲縮を有し、Tm−3(℃)における乾熱収縮率を3%以下となる捲縮性複合繊維を製造することができる。
(1)0.8<L<5
(2)0.4<H/L<0.9
L:捲縮の一山間の長さ(mm)
H:捲縮の山の高さ(mm)
In the present invention , it comprises a first component containing a polytrimethylene terephthalate resin and a second component containing a polyolefin resin having a melting point of 20 ° C. or more lower than the melting point of the first component. Occupies 50 to 100% of the fiber surface, melt spinning using a composite type nozzle arranged so that the center of gravity of the first component deviates from the center of gravity of the fiber, and the obtained spinning filament is drawn at a draw ratio of 1.8. After applying a stretching treatment at a magnification of 5 times or more and providing a serrated crimp with a crimp number of 5/25 mm or more and 25/25 mm or less, an annealing treatment is performed in an atmosphere at a temperature of 90 to 130 ° C. A composite fiber with a number of 7/25 mm or more and 25/25 mm or less mixed with serrated crimps and wavy crimps, or a mixture of serrated crimps and spiral crimps.
A composite fiber having an eccentricity of 5 to 50% of the composite fiber,
When the melting point of the second component in the composite fiber is Tm (° C.), it is selected from wavy crimps and spiral crimps satisfying the following formulas (1) and (2) at Tm-3 (° C.) Thus, a crimped conjugate fiber having at least one type of crimp and having a dry heat shrinkage rate of 3% or less at Tm-3 (° C.) can be produced.
(1) 0.8 <L <5
(2) 0.4 <H / L <0.9
L: Length between crimped mountains (mm)
H: Height of crimped mountain (mm)

本発明の不織布は、前記捲縮性複合繊維を少なくとも30mass%含有しており、前記捲縮性複合繊維はカード工程を通過した後に、波線状捲縮および螺旋状捲縮から選ばれた少なくとも一種の捲縮が発現していることを特徴とする。初期嵩回復性、長期嵩回復性ともに優れた、特に頻繁に荷重のかかる用途に好適である。 The nonwoven fabric of the present invention contains at least 30 mass% of the crimped conjugate fiber, and the crimped conjugate fiber is at least one selected from wavy crimp and spiral crimp after passing through the card process. It is characterized by the occurrence of crimps. It is excellent in both initial bulk recovery properties and long-term bulk recovery properties, and is particularly suitable for applications that are frequently loaded.

前記不織布は、前記捲縮性複合繊維の第2成分が溶融して、不織布を構成する繊維同士が熱融着されていると、他のバインダー成分を必要としないだけでなく、捲縮性複合繊維同士および他の構成繊維と捲縮性複合繊維とが部分的に接着点を有するので、不織布の形態安定性が向上するとともに、接着点を基点としたスプリング作用を発揮して嵩回復性が向上する点で好ましい。
以下、本発明の内容を説明する。
When the second component of the crimpable conjugate fiber is melted and the fibers constituting the nonwoven fabric are heat-sealed, the nonwoven fabric does not require another binder component, but also the crimpable composite Since the fibers and other constituent fibers and the crimped conjugate fiber partially have an adhesion point, the shape stability of the nonwoven fabric is improved, and the spring action based on the adhesion point is exhibited and the bulk recovery property is improved. It is preferable in terms of improvement.
The contents of the present invention will be described below.

本発明の捲縮性複合繊維は、ポリトリメチレンテレフタレート系樹脂を第1成分とし、ポリオレフィン系樹脂を第2成分とした重心の位置をずらした複合繊維とし、第2成分の融点近傍における乾熱収縮率を低く抑えるとともに、捲縮形状を所望の範囲の波線状捲縮および螺旋状捲縮から選ばれた少なくとも一種の捲縮に調整することにより、不織布にしたとき、柔らかな風合いであり、初期嵩回復性、長期嵩回復性ともに優れた、特に頻繁に荷重のかかる用途に適した繊維が得られる。特に、第2成分を熱融着成分として用いると、繊維同士が熱融着されて、繊維間のスプリング効果が最大限発揮され、かつポリトリメチレンテレフタレート系樹脂の持つ曲げ強さが小さく、曲げ回復力が大きく、曲げ弾性が小さくて、柔軟であるという特徴が最大限に発揮される。   The crimped conjugate fiber of the present invention is a conjugate fiber in which the position of the center of gravity is shifted with polytrimethylene terephthalate resin as the first component and polyolefin resin as the second component, and dry heat near the melting point of the second component. While keeping the shrinkage rate low and adjusting the crimped shape to at least one type of crimp selected from wavy crimps and spiral crimps in a desired range, when made into a nonwoven fabric, it has a soft texture, A fiber that is excellent in both initial bulk recovery property and long-term bulk recovery property and that is particularly suitable for frequently loaded applications can be obtained. In particular, when the second component is used as a heat fusion component, the fibers are thermally fused, the spring effect between the fibers is maximized, and the bending strength of the polytrimethylene terephthalate resin is small. The characteristics of high resilience, low flexural elasticity, and flexibility are exhibited to the maximum.

前記捲縮性複合繊維を用いた不織布は、スプリング効果、およびポリトリメチレンテレフタレート系樹脂の性質が最大限発揮されるから、従来の捲縮性複合繊維で得られた不織布と比較して、優れた圧縮柔軟性、優れた初期嵩はもちろんのこと、優れた初期嵩回復性および長期嵩回復性を共に有する不織布を得ることが可能である。   The nonwoven fabric using the crimped conjugate fiber exhibits the spring effect and the properties of the polytrimethylene terephthalate resin to the maximum, so it is superior to the nonwoven fabric obtained with the conventional crimped conjugate fiber. It is possible to obtain a nonwoven fabric having both excellent initial bulk recovery and long-term bulk recovery as well as excellent compression flexibility and excellent initial bulk.

本発明に用いられる第1成分は、ポリトリメチレンテレフタレート系樹脂(以下、PTTと記す場合がある)を含有する成分からなり、PTTホモ樹脂、下記に示すPTT共重合樹脂、あるいはPTTと他のポリエステル系樹脂とのブレンドであってもよく、捲縮性複合繊維としたときの乾熱収縮率を低く抑えて、所望の波線状捲縮および/または螺旋状捲縮を得られる範囲で、イソフタル酸、コハク酸、アジピン酸等の酸成分や、1,4ブタンジオール、1,6ヘキサンジオール等のグリコール成分、ポリテトラメチレングリコール、ポリオキシメチレングリコール等が10mass%以下共重合されていてもよいし、PET、PBTなど他のポリエステル系樹脂を50mass%以下でブレンドしてもよい。前記共重合成分が、10mass%を超えると、曲げ弾性率が小さくなるため好ましくない。一方、他のポリエステル系樹脂のブレンド率が50mass%を超えると、ブレンドした他のポリエステル系樹脂の性質に近づくため好ましくない。   The first component used in the present invention comprises a component containing a polytrimethylene terephthalate resin (hereinafter sometimes referred to as PTT), and is a PTT homo resin, a PTT copolymer resin shown below, or PTT and other A blend with a polyester resin may be used, and the dry heat shrinkage rate of the crimped conjugate fiber is suppressed to a low level so that a desired wavy crimp and / or spiral crimp can be obtained. Acid components such as acid, succinic acid and adipic acid, glycol components such as 1,4 butanediol and 1,6 hexanediol, polytetramethylene glycol, polyoxymethylene glycol and the like may be copolymerized to 10 mass% or less. However, other polyester resins such as PET and PBT may be blended at 50 mass% or less. When the copolymerization component exceeds 10 mass%, the flexural modulus becomes small, which is not preferable. On the other hand, when the blend ratio of other polyester resins exceeds 50 mass%, it is not preferable because it approaches the properties of other blended polyester resins.

前記PTTの極限粘度[η]は、0.4〜1.2が好ましい。より好ましくは、0.5〜1.1である。極限粘度[η]を上記範囲とすることにより、生産性に優れ、嵩弾性に優れた複合繊維を得ることができる。ここでいう極限粘度[η]とは、35℃のo−クロロフェノール溶液として、オストワルド粘度計により測定した、下記式(数1)に基づいて求められる値である。   The intrinsic viscosity [η] of the PTT is preferably 0.4 to 1.2. More preferably, it is 0.5 to 1.1. By setting the intrinsic viscosity [η] within the above range, a composite fiber having excellent productivity and excellent bulk elasticity can be obtained. The intrinsic viscosity [η] referred to here is a value determined based on the following formula (Equation 1) measured with an Ostwald viscometer as an o-chlorophenol solution at 35 ° C.

Figure 0004589417
ただし、
ηr:純度98%以上のo−クロロフェノールで溶解した試料の希釈溶液における35℃での粘度を同一温度で測定した上記溶剤全体の濃度で除した値。
C:上記溶液100ml中のグラム単位による溶質重量値)
Figure 0004589417
However,
ηr: A value obtained by dividing the viscosity at 35 ° C. in a diluted solution of a sample dissolved in o-chlorophenol having a purity of 98% or more by the concentration of the whole solvent measured at the same temperature.
C: Solute weight value in grams in 100 ml of the above solution)

前記極限粘度が0.4未満であると、樹脂の分子量が低すぎるため、紡糸性に劣るだけでなく、繊維強度も低く、実用性に乏しい。極限粘度が1.2を超えると、樹脂の分子量が大きくなって溶融粘度が高くなりすぎるため、単糸切れ等が発生し良好な紡糸が難しくなり好ましくない。   When the intrinsic viscosity is less than 0.4, the molecular weight of the resin is too low, so that not only the spinnability is inferior, but also the fiber strength is low and the practicality is poor. When the intrinsic viscosity exceeds 1.2, the molecular weight of the resin is increased and the melt viscosity becomes too high, so that single yarn breakage or the like occurs, and good spinning becomes difficult, which is not preferable.

前記PTTの融点としては、180℃〜250℃であることが好ましい。より好ましくは、200℃〜240℃である。ここでいう融点とは、JIS−K−7122に準じてDSC法により測定される融点のことを示す。融点が180℃未満であると、耐候性が低下したり、あるいは得られた複合繊維の曲げ弾性率が小さくなり過ぎる恐れがあり、融点が250℃を超えると、押し出し機など紡糸時の溶融温度を高くしなければならず、樹脂の分解による紡糸安定性が低下する恐れがある。   The melting point of the PTT is preferably 180 ° C to 250 ° C. More preferably, it is 200 degreeC-240 degreeC. The melting point here means a melting point measured by a DSC method according to JIS-K-7122. If the melting point is less than 180 ° C, the weather resistance may be lowered, or the flexural modulus of the resulting composite fiber may be too small. If the melting point exceeds 250 ° C, the melting temperature during spinning such as an extruder The spinning stability due to the decomposition of the resin may be lowered.

また、前記PTTには、必要に応じて、各種の添加剤、例えば、帯電防止剤、顔料、艶消し剤、熱安定剤、光安定剤、難燃剤、抗菌剤、滑剤、可塑剤、柔軟剤、酸化防止剤、紫外線吸収剤、結晶核剤など本発明の目的および効果を損なわない範囲で用途等に応じて混合することができる。   The PTT contains various additives as necessary, such as antistatic agents, pigments, matting agents, heat stabilizers, light stabilizers, flame retardants, antibacterial agents, lubricants, plasticizers, softeners. , Antioxidants, ultraviolet absorbers, crystal nucleating agents, and the like can be mixed depending on the application and the like as long as the objects and effects of the present invention are not impaired.

次に、本発明に用いられる第2成分は、ポリオレフィン系樹脂を含有する成分であり、例えば、ポリプロピレン樹脂、高密度ポリエチレン樹脂、中密度ポリエチレン樹脂、低密度ポリエチレン樹脂、直鎖状低密度ポリエチレン樹脂、ポリメチルペンテン樹脂、ポリブテン−1樹脂、及びそれらの共重合樹脂、アクリル酸、メタクリル酸、マレイン酸等の不飽和カルボン酸、及びそれらのエステル、酸無水物より少なくとも一種以上を共重合したもの、グラフト重合したもの、エラストマーなどを1種、または2種以上用いることができる。また、本発明の作用を損なわない範囲であれば、上記ポリオレフィン系樹脂以外に他の樹脂を混合してもよく、例えば、ポリエステル系樹脂、ポリスチレン系樹脂などを30mass%を超えない範囲で混合してもよい。   Next, the second component used in the present invention is a component containing a polyolefin resin, for example, a polypropylene resin, a high density polyethylene resin, a medium density polyethylene resin, a low density polyethylene resin, a linear low density polyethylene resin. , Polymethylpentene resin, polybutene-1 resin, and copolymer resins thereof, unsaturated carboxylic acids such as acrylic acid, methacrylic acid, and maleic acid, and esters and acid anhydrides thereof. One or two or more of those obtained by graft polymerization and elastomer can be used. Moreover, as long as the effect | action of this invention is not impaired, you may mix other resin other than the said polyolefin resin, for example, mix polyester resin, polystyrene resin, etc. in the range which does not exceed 30 mass%. May be.

前記ポリオレフィン系樹脂を熱融着成分として利用する場合、ポリオレフィン系樹脂の融点は、前記第1成分の融点よりも20℃以上低い温度であることが好ましい。より好ましくは、第1成分の融点よりも30℃以上低い温度である。ポリオレフィン系樹脂の融点と第1成分の融点との融点差が20℃未満であると、不織布の熱融着加工時に、第1成分も熱による影響を受けてへたりを生じて、嵩高性および嵩回復性が低下する恐れがある。   When the polyolefin resin is used as a heat fusion component, the melting point of the polyolefin resin is preferably 20 ° C. or lower than the melting point of the first component. More preferably, the temperature is 30 ° C. or more lower than the melting point of the first component. When the melting point difference between the melting point of the polyolefin-based resin and the melting point of the first component is less than 20 ° C., the first component is also affected by heat during the heat-sealing process of the nonwoven fabric, and the bulkiness and There is a possibility that the bulk recovery property is lowered.

前記ポリオレフィン系樹脂のうち、不織布にしたときの柔軟性、嵩高性、嵩弾性など本発明の目的および効果を発揮するためには、高密度ポリエチレン樹脂(以下、HDPEと記す場合がある)、エチレン−プロピレン共重合樹脂(以下、EPと記す場合がある)、エチレン−プロピレン−ブテン三元共重合樹脂(以下、EPBと記す場合がある)が好ましい。HDPE、EP、EPBのメルトフローレート(MFR)は、1〜100g/10minであることが好ましい。より好ましくは、10〜50g/10minである。なお、ここでいうMFRは、ASTM−D−1238により、HDPEは190℃、EP、EPBは230℃で、21.2N(2.16kgf)で測定される繊維製造前の樹脂のMFRを示す。MFRが1g/10min未満であると、溶融粘度が高すぎるため紡糸性に劣り、MFRが100g/10minを超えると、繊維製造中に繊維間融着が生じる恐れがある。   Among the polyolefin resins, a high-density polyethylene resin (hereinafter sometimes referred to as HDPE), ethylene, etc. in order to exert the objects and effects of the present invention such as flexibility, bulkiness, bulk elasticity when made into a nonwoven fabric, -Propylene copolymer resin (hereinafter may be referred to as EP) and ethylene-propylene-butene terpolymer resin (hereinafter may be referred to as EPB) are preferable. The melt flow rate (MFR) of HDPE, EP and EPB is preferably 1 to 100 g / 10 min. More preferably, it is 10-50 g / 10min. In addition, MFR here shows MFR of the resin before fiber manufacture measured by ASTM-D-1238, HDPE is 190 degreeC, EP and EPB are 230 degreeC, and 21.2N (2.16kgf). If the MFR is less than 1 g / 10 min, the melt viscosity is too high and the spinnability is inferior. If the MFR exceeds 100 g / 10 min, interfiber fusion may occur during fiber production.

また、前記ポリオレフィン系樹脂には、本発明の目的および効果を損なわない範囲で、各種の添加剤、例えば、帯電防止剤、顔料、艶消し剤、熱安定剤、光安定剤、難燃剤、抗菌剤、滑剤、可塑剤、柔軟剤、酸化防止剤、紫外線吸収剤、結晶核剤等いずれか一種類以上含まれていてもよい。   In addition, the polyolefin-based resin has various additives such as an antistatic agent, a pigment, a matting agent, a heat stabilizer, a light stabilizer, a flame retardant, an antibacterial agent, and the like within a range that does not impair the purpose and effect of the present invention. Any one or more of an agent, a lubricant, a plasticizer, a softener, an antioxidant, an ultraviolet absorber, a crystal nucleating agent and the like may be contained.

本発明の捲縮性複合繊維は、前記PTTを含有する第1成分と、前記ポリオレフィン系樹脂を含有する第2成分からなり、繊維断面において第2成分が繊維表面の少なくとも20%を占めた構造である。繊維断面において第2成分の占める割合が繊維表面の20%未満であると、熱融着不織布を作製する際に第2成分を熱融着させたとき、不織布強力が低く、実用に耐えられない恐れがある。より好ましい繊維断面における第2成分の占める割合は、繊維表面の50〜100%である。   The crimpable conjugate fiber of the present invention comprises a first component containing the PTT and a second component containing the polyolefin resin, and the second component occupies at least 20% of the fiber surface in the fiber cross section. It is. When the proportion of the second component in the fiber cross section is less than 20% of the fiber surface, when the second component is heat-sealed when producing a heat-bonded nonwoven fabric, the strength of the nonwoven fabric is low and cannot be practically used. There is a fear. The proportion of the second component in the more preferable fiber cross section is 50 to 100% of the fiber surface.

また本発明の捲縮性複合繊維は、第1成分の重心位置が繊維の重心位置からずれた構造を有する。図1に本発明の捲縮性複合繊維の繊維断面の一例を示す。第1成分(1)の重心位置(3)における繊維の重心位置(4)からのずれの割合(以下、偏心率と記す場合がある。)は、複合繊維の繊維断面を電子顕微鏡などで拡大撮影し、第1成分(1)の重心位置(3)をC1とし、複合繊維の重心位置(4)をCfとし、複合繊維の半径(5)をrfとしたとき、下記式(数2)で示す数値をいう。   The crimped conjugate fiber of the present invention has a structure in which the position of the center of gravity of the first component is shifted from the position of the center of gravity of the fiber. FIG. 1 shows an example of a fiber cross section of the crimped conjugate fiber of the present invention. The ratio of the deviation from the center of gravity position (4) of the fiber at the center of gravity position (3) of the first component (1) (hereinafter sometimes referred to as the eccentricity) is magnified by the electron microscope or the like. When the image is taken and the center of gravity (3) of the first component (1) is C1, the center of gravity (4) of the conjugate fiber is Cf, and the radius (5) of the conjugate fiber is rf, the following equation (Equation 2) The numerical value shown by.

Figure 0004589417
Figure 0004589417

第1成分(1)の重心位置(3)が繊維の重心位置(4)からずれている繊維断面としては、図1に示す偏心芯鞘型、あるいは並列型であることが好ましい形態である。場合によっては、多芯型であっても多芯部分が集合して繊維の重心位置からずれて存在しているものでも可能である。特に、偏心芯鞘型の繊維断面であると、熱処理時に容易に所望の波線状捲縮および/または螺旋状捲縮を発現させることができる点で最も好ましい。偏心芯鞘型複合繊維の偏心率は、5〜50%であることが好ましい。より好ましい偏心率は、7〜30%である。また、第1成分の繊維断面における形態は、円形以外に、楕円形、Y形、X形、井形、多角形、星形などの異形であってもよく、複合繊維の繊維断面における形態は、円形以外に、楕円形、Y形、X形、井形、多角形、星形などの異形、あるいは中空形であってもよい。   The cross section of the fiber in which the center of gravity (3) of the first component (1) deviates from the center of gravity (4) of the fiber is preferably an eccentric core-sheath type or a parallel type as shown in FIG. Depending on the case, even a multi-core type may be used in which multi-core portions are gathered and are shifted from the center of gravity of the fiber. In particular, the eccentric core-sheath fiber cross section is most preferable in that desired wavy crimps and / or spiral crimps can be easily expressed during heat treatment. The eccentricity ratio of the eccentric core-sheath composite fiber is preferably 5 to 50%. A more preferable eccentricity is 7 to 30%. In addition to the circular shape, the shape of the first component in the fiber cross section may be elliptical, Y-shaped, X-shaped, well-shaped, polygonal, star-shaped, etc. In addition to the circular shape, an elliptical shape, a Y shape, an X shape, a well shape, a polygonal shape, a star shape, or a hollow shape may be used.

さらに、前記複合繊維は、第2成分の融点をTm(℃)としたとき、Tm−3(℃)において下記の範囲を満たす波線状捲縮および螺旋状捲縮から選ばれた少なくとも一種の捲縮を有しており、Tm−3(℃)における乾熱収縮率が3%以下を満たすものである。
(1)0.8<L<5
(2)0.4<H/L<0.9
L:捲縮の一山間の長さ(mm)
H:捲縮の山の高さ(mm)
Furthermore, when the melting point of the second component is Tm (° C.), the composite fiber has at least one kind of crimp selected from wavy crimps and spiral crimps satisfying the following range at Tm-3 (° C.). It has shrinkage, and the dry heat shrinkage rate at Tm-3 (° C.) satisfies 3% or less.
(1) 0.8 <L <5
(2) 0.4 <H / L <0.9
L: Length of crimped mountain (mm)
H: Height of crimped mountain (mm)

図2に本発明の捲縮性複合繊維が捲縮発現したときの捲縮形態を示す。本発明でいう波線状捲縮(6)とは、図2(a)に示すような捲縮の山部が湾曲したものを指し、螺旋状捲縮(7)とは、図2(b)に示すような捲縮の山部が螺旋状に湾曲したものを指し、図2(c)に示すような波線状捲縮と螺旋状捲縮とが混在した捲縮(8)も含む概念である。図3に示すような捲縮の山が鋭角である、いわゆる鋸歯状捲縮(9)のままであると、不織布としたときの圧縮に対する面弾性、いわゆるスプリング効果に劣り、特に十分な初期嵩回復性が得られないからである。   FIG. 2 shows a crimped form when the crimped conjugate fiber of the present invention is crimped. The wavy crimp (6) referred to in the present invention refers to a curved crest as shown in FIG. 2 (a), and the spiral crimp (7) refers to FIG. 2 (b). 2 is a concept including a crimp (8) in which a wavy crimp and a spiral crimp are mixed as shown in FIG. 2 (c). is there. When the so-called serrated crimp (9) has a sharp crest as shown in FIG. 3, it is inferior in surface elasticity against compression when compressed into a nonwoven fabric, so-called spring effect, and particularly has a sufficient initial bulk. This is because recoverability cannot be obtained.

また、図2(a)に示すように、本発明でいう捲縮の一山間の長さL(10)は、捲縮の凸部からとなりの凸部までの距離のことをいう。捲縮の山の高さH(11)は、捲縮の凸部からとなりの凹部までの捲縮の凹凸間の深さの距離のことをいう。そして、前記捲縮の一山間の長さL(10)と前記捲縮の山の高さH(11)は、次のようにして測定する。まず、捲縮性複合繊維の単繊維群を適量準備し、例えばカード機を用いるなど公知の方法で開繊して、約5g程度をできるだけシート状(ウェブ状)になるようにして採取する。次いで、シート状(ウェブ状)の繊維群を第2成分の融点をTm(℃)としたとき、Tm−3(℃)の温度に調整した電気オーブンにて(循環式のものでも構わない)30秒間熱処理をし、熱処理後の単繊維を任意10本採取し、スライドガラスにのせ、捲縮形状が変わらないように、繊維が一直線上になるようにした後、カバーガラスをのせ捲縮を平面上にした後、捲縮を顕微鏡にて観察し、その10本のL(10)とH(11)を測定し、その平均値をいう。なお、本発明では、スライドガラスをのせる際、捲縮が図2(b)のように螺旋状となっている場合は螺旋を解くこととする。   Further, as shown in FIG. 2 (a), the length L (10) between the crimps in the present invention refers to the distance from the convex part of the crimp to the adjacent convex part. The height H (11) of the crimped mountain refers to the distance of the depth between the crimped irregularities from the crimped convex part to the adjacent concave part. The length L (10) between the crimped peaks and the height H (11) of the crimped peaks are measured as follows. First, an appropriate amount of a single fiber group of crimped conjugate fibers is prepared, and opened by a known method such as using a card machine, and about 5 g is collected in a sheet form (web form) as much as possible. Next, in the sheet-like (web-like) fiber group, when the melting point of the second component is Tm (° C.), in an electric oven adjusted to a temperature of Tm-3 (° C.) (circulation type may be used) Heat-treat for 30 seconds, collect 10 arbitrary single fibers after heat treatment, place them on a slide glass, make sure that the fibers are in a straight line so that the crimped shape does not change, and then place the cover glass and crimp After flattening, the crimps are observed with a microscope, the ten L (10) and H (11) are measured, and the average value is referred to. In the present invention, when the slide glass is placed, if the crimp is spiral as shown in FIG.

前記Lは、0.8<L<5であり、好ましくは、1<L<4である。より好ましくは、1.2<L<3である。Lが0.8未満であると、捲縮の山が小さすぎるため、得られる不織布の嵩高性に乏しくなるだけでなく、不織布の比容積が小さくなるため柔らかな触感が得られなくなる。Lが5を超えると、嵩回復性における重要なファクターである単繊維のスプリング効果が働きにくく、特に薄目付の不織布を作製した場合その傾向が顕著になる。   The L is 0.8 <L <5, preferably 1 <L <4. More preferably, 1.2 <L <3. If L is less than 0.8, the crimped crest is too small, so that not only the bulkiness of the resulting nonwoven fabric becomes poor, but also the specific volume of the nonwoven fabric becomes small, so that a soft tactile sensation cannot be obtained. When L is more than 5, the spring effect of single fibers, which is an important factor in bulk recovery, is difficult to work, and the tendency becomes particularly prominent when a non-woven fabric with a light weight is produced.

前記H/Lは、0.4<H/L<0.9であり、好ましくは0.5<H/L<0.85である。より好ましくは、0.6<H/L<0.85である。H/Lが0.4未満であると、捲縮率が小さすぎ、つまり捲縮の山が平べったいものであるため、単繊維のスプリング効果が弱まり、嵩回復性が劣ったものとなる。H/Lが0.9を超えると、捲縮率が大きすぎ、つまり捲縮の山が深くなりすぎるため、これも単繊維のスプリング効果が弱まり、嵩回復性が劣ったものとなる。得られる不織布の嵩高性に乏しくなり、特に嵩回復性が悪くなる。   The H / L is 0.4 <H / L <0.9, preferably 0.5 <H / L <0.85. More preferably, 0.6 <H / L <0.85. If the H / L is less than 0.4, the crimp rate is too small, that is, the crimp peaks are flat, so that the spring effect of the single fiber is weakened and the bulk recovery property is inferior. Become. If H / L exceeds 0.9, the crimp rate is too large, that is, the crimp peaks become too deep, so that the spring effect of the single fiber is weakened and the bulk recovery is inferior. The resulting nonwoven fabric has poor bulkiness, and in particular the bulk recovery properties are poor.

また、前記複合繊維のTm−3(℃)における乾熱収縮率は、3%以下である。好ましくは、1%以下である。単繊維の乾熱収縮率は、以下のようにして測定する。
[乾熱収縮率]
単繊維群を準備し、トータル繊度が約111dtexとなるように単繊維の本数を調整して束状にする。次いで束状単繊維群の先に2.5gを荷重を吊るし、荷重を吊るした状態での繊維の長さ(S0)を測定する。次いで、0.8sec/℃の速度で加熱していき、所定の温度まで上げたときの繊維の長さ(S1)を測定し、下記式で算出して、乾熱収縮率とした。
乾熱収縮率=(S0―S1)×100/S0
Moreover, the dry heat shrinkage rate at Tm-3 (° C.) of the composite fiber is 3% or less. Preferably, it is 1% or less. The dry heat shrinkage rate of the single fiber is measured as follows.
[Dry heat shrinkage]
A single fiber group is prepared, and the number of single fibers is adjusted to a bundle shape so that the total fineness is about 111 dtex. Next, a load of 2.5 g is hung at the tip of the bundle-like single fiber group, and the length (S 0 ) of the fiber in a state where the load is hung is measured. Next, the fiber was heated at a rate of 0.8 sec / ° C., and the length (S 1 ) of the fiber when it was raised to a predetermined temperature was measured and calculated by the following formula to obtain the dry heat shrinkage.
Dry heat shrinkage = (S 0 −S 1 ) × 100 / S 0

乾熱収縮率が3%を超えると、熱処理をして捲縮を発現させる際に収縮を伴って、不織布自体が収縮を引き起こし、不織布工程性および不織布の地合の悪化を引き起こすだけでなく、過剰に捲縮発現する恐れがあり、不織布にしたときに伸縮性をも発現し、用途によっては使用できない恐れがある。   When the dry heat shrinkage rate exceeds 3%, the nonwoven fabric itself causes shrinkage when shrinkage is caused by heat treatment to cause crimping, and not only causes the nonwoven fabric processability and the nonwoven fabric formation to deteriorate, There is a possibility that crimps may develop excessively, and when it is made into a non-woven fabric, it also exhibits stretchability and may not be usable depending on the application.

本発明の捲縮性複合繊維の単繊維繊度は、特に限定されないが0.5〜150dtexが好ましい。より好ましくは、1〜30dtexであり、最も好ましくは、2〜10dtexである。例えば、衛生材料の表面材など用途に用いる場合であれば、1〜7dtexが好ましく、クッション材などの用途に用いる場合であれば、4〜20dtexが好ましい。   The single fiber fineness of the crimped conjugate fiber of the present invention is not particularly limited, but is preferably 0.5 to 150 dtex. More preferably, it is 1-30 dtex, Most preferably, it is 2-10 dtex. For example, 1 to 7 dtex is preferable when used for applications such as surface materials of sanitary materials, and 4 to 20 dtex is preferable when used for applications such as cushion materials.

前記捲縮性複合繊維は、以下のように製造することができる。まず、ポリトリメチレンテレフタレート系樹脂を含有する第1成分と、ポリオレフィン系樹脂を含有する第2成分として、繊維断面において第2成分が繊維表面の少なくとも20%を占め、第1成分の重心位置が繊維の重心位置からずれるように配置された複合型ノズル、例えば偏心芯鞘型複合ノズルを用いて、第1成分を紡糸温度240〜330℃、第2成分を紡糸温度200〜300℃で溶融紡糸し、引取速度100〜1500m/minで引き取り、紡糸フィラメントを得る。次いで、延伸温度を40℃以上、第2成分の融点未満の温度で、延伸倍率1.8倍以上で延伸処理を施す。より好ましい延伸温度の下限は、第1成分のガラス転移点以上である。より好ましい延伸温度の上限は、90℃以下である。より好ましい延伸倍率の下限は、2倍以上である。より好ましい延伸倍率の上限は、4倍以下である。延伸倍率が1.8倍未満であると、加熱したときに波線状捲縮および/または螺旋状捲縮が発現し難く、不織布にしたときに十分な嵩高性が得られないだけでなく、繊維自体の剛性も小さくなり、カード通過性などの不織布工程性に劣るからである。また、このとき前記延伸時の前後において必要に応じて90〜130℃の乾熱、湿熱、蒸熱等の雰囲気下でアニーリング処理を施してもよい。   The crimped conjugate fiber can be produced as follows. First, as a first component containing a polytrimethylene terephthalate resin and a second component containing a polyolefin resin, the second component occupies at least 20% of the fiber surface in the fiber cross section, and the center of gravity of the first component is Using a composite nozzle arranged so as to deviate from the position of the center of gravity of the fiber, for example, an eccentric core-sheath composite nozzle, the first component is melt-spun at a spinning temperature of 240 to 330 ° C., and the second component is melt-spun at a spinning temperature of 200 to 300 ° C. Then, it is taken up at a take-up speed of 100 to 1500 m / min to obtain a spun filament. Next, stretching is performed at a stretching temperature of 40 ° C. or higher and lower than the melting point of the second component at a draw ratio of 1.8 times or higher. A more preferable lower limit of the stretching temperature is not less than the glass transition point of the first component. A more preferable upper limit of the stretching temperature is 90 ° C. or less. A more preferable lower limit of the draw ratio is 2 times or more. A more preferable upper limit of the draw ratio is 4 times or less. When the draw ratio is less than 1.8 times, not only does crimping and / or spiral crimping hardly occur when heated, and sufficient bulkiness cannot be obtained when it is made into a nonwoven fabric. This is because the rigidity of itself becomes small and the nonwoven fabric processability such as card passing property is inferior. Moreover, you may perform an annealing process in atmospheres, such as 90-130 degreeC dry heat, wet heat, and steam, before and after the said extending | stretching at this time as needed.

次いで、必要に応じて繊維処理剤を付与する前または後に、スタッファボックス式捲縮機など公知の捲縮機を用いて捲縮数5個/25mm以上、25個/25mm以下の鋸歯状捲縮を付与する。鋸歯状捲縮の捲縮数が5個/25mm未満であると、カード通過性が低下し、捲縮数が25個/25mmを超えると、カード通過性が低下するだけでなく、捲縮発現後の捲縮数が多くなって嵩回復性に悪影響を及ぼす恐れがある。   Next, before or after applying the fiber treatment agent as necessary, a saw-toothed scissors having a number of crimps of 5/25 mm or more and 25/25 mm or less using a known crimping machine such as a stuffer box type crimping machine. Give contraction. If the number of crimps of the serrated crimp is less than 5 / 25mm, the card passing ability is lowered, and if the number of crimps exceeds 25 / 25mm, not only the card passing ability is lowered, but also the crimp is expressed. There is a possibility that the number of crimps later increases and adversely affects the bulk recovery.

さらに、前記鋸歯状捲縮を付与した後、90〜130℃の乾熱、湿熱、あるいは蒸熱の雰囲気下でアニーリング処理を施される。具体的には、繊維処理剤を付与した後に鋸歯状捲縮を付与し、90〜130℃の乾熱雰囲気下でアニーリング処理と同時に乾燥処理を施すことが、工程を簡略化することができ、好ましい。アニーリング処理が90℃未満であると、乾熱収縮率が大きくなる傾向であり、得られる不織布の地合が乱れたり、生産性が低下したりする恐れがある。   Further, after the serrated crimp is applied, an annealing treatment is performed in an atmosphere of dry heat, wet heat, or steam at 90 to 130 ° C. Specifically, it is possible to simplify the process by providing a sawtooth crimp after applying the fiber treating agent and performing a drying process simultaneously with the annealing process in a dry heat atmosphere of 90 to 130 ° C. preferable. When the annealing treatment is less than 90 ° C., the dry heat shrinkage tends to increase, and the formation of the resulting nonwoven fabric may be disturbed or the productivity may be lowered.

上記方法により得られた複合繊維は、主として、図4に示すような捲縮数7個/25mm以上、25個/25mm以下の鋸歯状捲縮と波線状捲縮が混在した捲縮(12)、あるいは鋸歯状捲縮と螺旋状捲縮が混在した捲縮を採ることが、後述するカード工程性を低下させることなく、嵩高な不織布を得ることができ、好ましい。   The composite fiber obtained by the above method is mainly a crimp in which saw-tooth crimps and wavy crimps having a crimp number of 7/25 mm or more and 25/25 mm or less as shown in FIG. 4 are mixed (12) Alternatively, it is preferable to use a crimp in which serrated crimps and spiral crimps are mixed, because a bulky nonwoven fabric can be obtained without deteriorating card processability described later.

そして、所望の繊維長に切断されて、第2成分の融点をTm(℃)としたときTm−3(℃)において所望の範囲を満たす波線状捲縮および/または螺旋状捲縮を有し、Tm−3(℃)における乾熱収縮率が3%以下である捲縮性複合繊維が得られる。   And when it is cut into a desired fiber length and the melting point of the second component is Tm (° C.), it has wavy crimps and / or spiral crimps that satisfy the desired range at Tm-3 (° C.) A crimpable conjugate fiber having a dry heat shrinkage of 3% or less at Tm-3 (° C.) is obtained.

次に、本発明の不織布は、上記のようにして得られた捲縮性複合繊維を少なくとも30mass%含有する。前記捲縮性複合繊維の含有量が30mass%未満であると、柔らかな風合いであり、初期嵩回復性、長期嵩回復性ともに優れた、特に頻繁に荷重のかかる用途に適した不織布が得られないからである。   Next, the nonwoven fabric of the present invention contains at least 30 mass% of the crimped conjugate fiber obtained as described above. When the content of the crimped conjugate fiber is less than 30 mass%, a soft texture is obtained, and a nonwoven fabric that is excellent in initial bulk recovery property and long-term bulk recovery property, and particularly suitable for frequently loaded applications can be obtained. Because there is no.

本発明の不織布を構成する繊維ウェブ形態としては、パラレルウェブ、セミランダムウェブ、ランダムウェブ、クロスレイウェブ、クリスクロスウェブ、エアレイウェブなどが挙げられる。   Examples of the fiber web form constituting the nonwoven fabric of the present invention include a parallel web, a semi-random web, a random web, a cross lay web, a Chris cross web, and an air lay web.

前記繊維ウェブは、必要に応じて、ニードルパンチ処理あるいは水流交絡処理が施された後、熱処理される。熱処理の手段としては、特に限定はされないが、本発明の捲縮性複合繊維の機能を十分に発揮させるのであれば、熱風貫通式熱処理機、熱風上下吹き付け式熱処理機、赤外線式熱処理機など風圧など圧力のあまりかからない熱処理機を用いることが好ましい。また、熱処理温度としては、捲縮性複合繊維の波線状捲縮および/または螺旋状捲縮が下記の形状となる温度範囲に設定すればよく、例えば、Tm−10(℃)〜Tm+10(℃)の範囲で設定するとよい。
(1)0.8<L<5
(2)0.4<H/L<0.9
L:捲縮の一山間の長さ(mm)
H:捲縮の山の高さ(mm)
The fiber web is subjected to heat treatment after being subjected to needle punching treatment or hydroentanglement treatment as necessary. The heat treatment means is not particularly limited, but if the function of the crimped conjugate fiber of the present invention is sufficiently exhibited, a hot air penetration heat treatment machine, a hot air up-and-down heat treatment machine, an infrared heat treatment machine, etc. It is preferable to use a heat treatment machine that does not require much pressure. The heat treatment temperature may be set within a temperature range in which the wavy crimp and / or the spiral crimp of the crimped conjugate fiber have the following shape, for example, Tm-10 (° C.) to Tm + 10 (° C. ) Is recommended.
(1) 0.8 <L <5
(2) 0.4 <H / L <0.9
L: Length of crimped mountain (mm)
H: Height of crimped mountain (mm)

前記熱処理温度がTm−10(℃)未満であると、捲縮の発現が不十分となる恐れがあり、熱処理温度がTm+10(℃)を超えても、捲縮発現状態に大差がないからである。特に、捲縮性複合繊維の第2成分を溶融させて、不織布を構成する繊維同士を熱融着させる場合であれば、Tm(℃)〜Tm+40(℃)の範囲で設定するとよい。繊維同士を熱融着させることにより、捲縮性複合繊維同士および他の構成繊維と捲縮性複合繊維とが部分的に接着点を有するので、不織布の形態安定性が向上するとともに、接着点を基点としたスプリング作用を発揮して嵩回復性が向上する点で好ましい。熱融着させる場合の熱処理温度が高いのは、第2成分の融着力を向上させるためであり、Tm+40(℃)を超えると、第1成分が熱の影響でへたる恐れがある。   If the heat treatment temperature is less than Tm-10 (° C.), there is a risk that the expression of crimp will be insufficient, and even if the heat treatment temperature exceeds Tm + 10 (° C.), there is no great difference in the state of crimp development. is there. In particular, when the second component of the crimpable conjugate fiber is melted and the fibers constituting the nonwoven fabric are heat-sealed, the temperature may be set in the range of Tm (° C.) to Tm + 40 (° C.). By thermally fusing the fibers together, the crimpable conjugate fibers and other constituent fibers and the crimpable conjugate fibers partially have adhesion points, so that the shape stability of the nonwoven fabric is improved and the adhesion points It is preferable in that the spring action based on is improved and the bulk recovery is improved. The reason for the high heat treatment temperature in the case of heat fusion is to improve the fusing power of the second component, and if it exceeds Tm + 40 (° C.), the first component may be damaged by heat.

特に、前記条件により繊維同士を熱融着させた不織布は、柔らかな風合いを有するとともに、初期嵩回復性、長期嵩回復性ともに優れた不織布となり、下記の測定により得られる初期嵩回復率が50%以上、かつ長期嵩回復率が85%以上を満たす不織布が得られる。
[嵩回復率]
合計の目付が約1000g/m2となるように10cm角に切断した不織布を必要な枚数準備し、重ね合わせて初期合計厚み(T0)を測定する。重ね合わせた不織布の上に10cm角、9.8kPa荷重の重りを載せて、常温雰囲気下で24時間荷重をかけ、24時間後荷重を取り除き、除重直後の重ね合わせた不織布の合計厚み(T1)、および除重24時間後の合計厚み(T2)を測定し、不織布の嵩回復率を下記式により算出し、それぞれ初期嵩回復率、長期嵩回復率とする。
初期嵩回復率(%)=(T1/T0)×100
長期嵩回復率(%)=(T2/T0)×100
In particular, a nonwoven fabric in which fibers are heat-sealed according to the above conditions has a soft texture and is excellent in both initial bulk recovery property and long-term bulk recovery property, and has an initial bulk recovery rate of 50 obtained by the following measurement. % Or more, and a nonwoven fabric satisfying a long-term bulk recovery rate of 85% or more is obtained.
[Bulk recovery rate]
A necessary number of non-woven fabrics cut into 10 cm squares are prepared so that the total basis weight is about 1000 g / m 2 , superposed, and the initial total thickness (T 0 ) is measured. A 10 cm square, 9.8 kPa load weight is placed on the laminated nonwoven fabric, a load is applied for 24 hours in a normal temperature atmosphere, the load is removed after 24 hours, and the total thickness of the laminated nonwoven fabric immediately after dewetting (T 1 ), and the total thickness (T 2 ) after 24 hours of dewetting, the bulk recovery rate of the nonwoven fabric is calculated by the following formula, and the initial bulk recovery rate and the long-term bulk recovery rate are obtained respectively.
Initial bulk recovery rate (%) = (T 1 / T 0 ) × 100
Long-term bulk recovery rate (%) = (T 2 / T 0 ) × 100

前記初期嵩回復率および前記長期嵩回復率を満たすことにより、例えば、紙おむつや椅子などのクッション材などの用途に用いた場合、面圧力がかかっても、へたり難く、嵩高感が持続するという効果を奏する。   By satisfying the initial bulk recovery rate and the long-term bulk recovery rate, for example, when used for cushioning materials such as paper diapers and chairs, even if surface pressure is applied, it is difficult to sag and the bulkiness is sustained. There is an effect.

以下、実施例を挙げて本発明をより詳細に説明するが、本発明は実施例などにより何ら限定されるものではない。   EXAMPLES Hereinafter, although an Example is given and this invention is demonstrated in detail, this invention is not limited at all by an Example.

[実施例1]
第1成分として、極限粘度0.93、融点220℃であるPTT、第2成分としてMFR12、融点(Tm)が130℃であるHDPE(日本ポリケム(株)製、HE480)を用い、芯(第1成分)/鞘(第2成分)の複合比(容積比)を5/5とし、芯成分を偏芯させた700孔を有する公知の芯鞘型複合ノズルを用いて、両成分の紡糸温度をそれぞれ270℃として溶融押出し、8dtexの紡糸フィラメントを得た。このとき偏心率は25%であった。得られた紡糸フィラメントを80℃の温水中で3倍に延伸し、4.4dtexの延伸フィラメントとし、繊維処理剤を付与した。次いで、このフィラメントにスタフィンボックス型クリンパーにて鋸歯状捲縮が約10個/25mmとなるように捲縮処理を施した後、110℃に設定した熱風貫通型乾燥機にてアニーリング処理とともに乾燥させて、50mmの繊維長に切断し、捲縮性複合繊維を得た。このときの捲縮状態は、L=1.63、H/L=0.59の波線状捲縮と鋸歯状捲縮が混在していた。そして、得られた複合繊維をTm−3℃(127℃)で30秒間熱処理をしたときの捲縮状態は、L=1.48、H/L=0.81の波線状捲縮および螺旋状捲縮が発現していた。Tm−3℃(127℃)における乾熱収縮率は0%であった。
[Example 1]
As the first component, PTT having an intrinsic viscosity of 0.93 and a melting point of 220 ° C., MFR 12 as the second component, and HDPE having a melting point (Tm) of 130 ° C. (manufactured by Nippon Polychem Co., Ltd., HE480) are used. 1 component) / sheath (second component) composite ratio (volume ratio) is 5/5, and using a known core-sheath type composite nozzle having 700 holes in which the core component is eccentric, the spinning temperature of both components Each was melt-extruded at 270 ° C. to obtain an 8 dtex spun filament. At this time, the eccentricity was 25%. The obtained spinning filament was stretched 3 times in warm water at 80 ° C. to obtain a 4.4 dtex filament, and a fiber treatment agent was applied. Next, this filament was crimped with a staffin box crimper so that the number of serrated crimps was about 10 pieces / 25 mm, and then dried with an annealing treatment in a hot air through dryer set at 110 ° C. And cut into a fiber length of 50 mm to obtain a crimped conjugate fiber. The crimped state at this time was a mixture of wavy crimps and sawtooth crimps of L = 1.63 and H / L = 0.59. The crimped state when the obtained conjugate fiber was heat-treated at Tm-3 ° C. (127 ° C.) for 30 seconds was a wavy crimp and a spiral shape with L = 1.48 and H / L = 0.81 Crimp was expressed. The dry heat shrinkage rate at Tm-3 ° C. (127 ° C.) was 0%.

[実施例2]
第2成分をMFR25、融点(Tm)138℃であるEP共重合樹脂(出光石油化学(株)製、Y2045GP)を使用した以外は、実施例1と同様の方法で、捲縮性複合繊維を得た。このときの捲縮状態は、L=3.01、H/L=0.31の波線状捲縮と鋸歯状捲縮が混在していた。そして、得られた複合繊維をTm−3℃(142℃)で30秒間熱処理をしたときの捲縮状態は、L=2.25、H/L=0.61の波線状捲縮および螺旋状捲縮が発現していた。Tm−3℃(142℃)における乾熱収縮率は0%であった。
[Example 2]
A crimped conjugate fiber was prepared in the same manner as in Example 1 except that an EP copolymer resin (Y2045GP, manufactured by Idemitsu Petrochemical Co., Ltd.) having an MFR25 and a melting point (Tm) of 138 ° C. was used as the second component. Obtained. The crimped state at this time was a mixture of wavy crimps and sawtooth crimps of L = 3.01 and H / L = 0.31. The crimped state when the obtained conjugate fiber was heat-treated at Tm-3 ° C. (142 ° C.) for 30 seconds was a wavy crimp and a spiral shape of L = 2.25 and H / L = 0.61 Crimp was expressed. The dry heat shrinkage rate at Tm-3 ° C. (142 ° C.) was 0%.

[比較例1]
第1成分として、MFR20、融点162℃であるPP(日本ポリケム(株)製、SA1H)を使用した以外は、実施例1と同様の方法で、捲縮性複合繊維を得た。このときの捲縮状態は、L=3.13、H/L=0.24の波線状捲縮と鋸歯状捲縮が混在していた。そして、得られた複合繊維をTm−3℃(127℃)で30秒間熱処理をしたときの捲縮状態は、L=1.90、H/L=0.46の波線状捲縮および螺旋状捲縮が発現していた。Tm−3℃(127℃)における乾熱収縮率は0%であった。
[Comparative Example 1]
A crimped conjugate fiber was obtained in the same manner as in Example 1 except that MFR20 and PP having a melting point of 162 ° C. (manufactured by Nippon Polychem Co., Ltd., SA1H) were used as the first component. The crimped state at this time was a mixture of wavy crimps and sawtooth crimps of L = 3.13 and H / L = 0.24. The crimped state when the obtained conjugate fiber was heat-treated at Tm-3 ° C. (127 ° C.) for 30 seconds was a wavy crimp and a spiral shape of L = 1.90 and H / L = 0.46. Crimp was expressed. The dry heat shrinkage rate at Tm-3 ° C. (127 ° C.) was 0%.

[比較例2]
第1成分として、極限粘度0.64、融点270℃であるPET(東レ(株)製、T200E)を使用し、芯成分の紡糸温度を300℃とした以外は、実施例1と同様の方法で、捲縮性複合繊維を得た。このときの捲縮状態は、L=2.19、H/L=0.39の波線状捲縮と鋸歯状捲縮が混在していた。そして、得られた複合繊維をTm−3℃(127℃)で30秒間熱処理をしたときの捲縮状態は、L=1.76、H/L=0.70の波線状捲縮および螺旋状捲縮が発現していた。Tm−3℃(127℃)における乾熱収縮率は0%であった。
[Comparative Example 2]
The same method as in Example 1 except that PET having an intrinsic viscosity of 0.64 and a melting point of 270 ° C. (T200E manufactured by Toray Industries, Inc.) was used as the first component, and the spinning temperature of the core component was 300 ° C. Thus, crimped conjugate fibers were obtained. The crimped state at this time was a mixture of wavy crimps and sawtooth crimps of L = 2.19 and H / L = 0.39. The crimped state when the obtained conjugate fiber is heat-treated at Tm-3 ° C. (127 ° C.) for 30 seconds is a wavy crimp and a spiral shape with L = 1.76 and H / L = 0.70. Crimp was expressed. The dry heat shrinkage rate at Tm-3 ° C. (127 ° C.) was 0%.

[比較例3]
第1成分として、極限粘度0.75、融点228℃であるPBT(ポリプラスチックス(株)製、400FP)を使用した以外は、実施例1と同様の方法で、捲縮性複合繊維を得た。このときの捲縮状態は、L=2.18、H/L=0.47の波線状捲縮と鋸歯状捲縮が混在していた。そして、得られた複合繊維をTm−3℃(127℃)で30秒間熱処理をしたときの捲縮状態は、L=1.07、H/L=0.53の波線状捲縮および螺旋状捲縮が発現していた。Tm−3℃(127℃)における乾熱収縮率は0%であった。
[Comparative Example 3]
A crimped conjugate fiber was obtained in the same manner as in Example 1 except that PBT having an intrinsic viscosity of 0.75 and a melting point of 228 ° C. (400 FP, manufactured by Polyplastics Co., Ltd.) was used as the first component. It was. The crimped state at this time was a mixture of wavy crimps and sawtooth crimps of L = 2.18 and H / L = 0.47. The crimped state when the obtained conjugate fiber was heat-treated at Tm-3 ° C. (127 ° C.) for 30 seconds was a wavy crimp and a spiral shape of L = 1.07, H / L = 0.53 Crimp was expressed. The dry heat shrinkage rate at Tm-3 ° C. (127 ° C.) was 0%.

[比較例4]
クリンパーにて、捲縮数が35個/25mmになるように捲縮を施したこと以外は、実施例1と同様の方法で、捲縮性複合繊維を得た。このときの捲縮状態は、L=0.71、H/L=0.51の波線状捲縮と鋸歯状捲縮が混在していた。そして、得られた複合繊維をTm−3℃(127℃)で30秒間熱処理をしたときの捲縮状態は、L=0.75、H/L=0.71の波線状捲縮および螺旋状捲縮が発現していた。Tm−3℃(127℃)における乾熱収縮率は0%であった。
[Comparative Example 4]
A crimped conjugate fiber was obtained in the same manner as in Example 1 except that crimping was performed with a crimper so that the number of crimps was 35/25 mm. The crimped state at this time was a mixture of wavy crimps and sawtooth crimps of L = 0.71 and H / L = 0.51. The crimped state when the obtained conjugate fiber is heat-treated at Tm-3 ° C. (127 ° C.) for 30 seconds is a wavy crimp and a spiral shape of L = 0.75 and H / L = 0.71 Crimp was expressed. The dry heat shrinkage rate at Tm-3 ° C. (127 ° C.) was 0%.

[比較例5]
ノズルを同芯円状に組んだこと以外は、実施例1と同様の方法で、捲縮性複合繊維を得た。このときの捲縮状態は、L=1.80,H/L=0.36で鋸歯状捲縮のままであった。そして、得られた複合繊維をTm−3℃(127℃)で30秒間処理した時の捲縮状態は、L=1.87、H/L=0.37で鋸歯状捲縮のままであった。Tm−3℃(127℃)における乾熱収縮率は0%であった。
[Comparative Example 5]
A crimped conjugate fiber was obtained in the same manner as in Example 1 except that the nozzles were assembled concentrically. The crimped state at this time was a serrated crimp with L = 1.80 and H / L = 0.36. The crimped state when the obtained composite fiber was treated at Tm−3 ° C. (127 ° C.) for 30 seconds was L = 1.87 and H / L = 0.37 and remained in a serrated crimp. It was. The dry heat shrinkage rate at Tm-3 ° C. (127 ° C.) was 0%.

[比較例6]
実施例1の紡糸フィラメントを1.5倍で延伸処理した以外は、実施例1と同様の方法で、捲縮性複合繊維を得た。このときの捲縮状態は、L=1.87,H/L=0.30で鋸歯状捲縮のままであった。そして、得られた複合繊維をTm−3℃(127℃)で30秒間処理した時の捲縮状態は、L=1.70、H/L=0.28でほとんどが鋸歯状捲縮として残存していた。Tm−3℃(127℃)における乾熱収縮率は1.7%であった。
[Comparative Example 6]
A crimped conjugate fiber was obtained in the same manner as in Example 1 except that the spinning filament of Example 1 was drawn at a magnification of 1.5 times. The crimped state at this time was L = 1.87, H / L = 0.30, and remained in a serrated crimp. The crimped state when the obtained composite fiber was treated at Tm-3 ° C. (127 ° C.) for 30 seconds was L = 1.70, H / L = 0.28, and most remained as serrated crimps. Was. The dry heat shrinkage rate at Tm-3 ° C. (127 ° C.) was 1.7%.

[比較例7]
アニーリング処理を70℃で実施したこと以外は、実施例1と同様の方法で、捲縮性複合繊維を得た。このときの捲縮状態は、L=2.25、H/L=0.45の波線状捲縮と鋸歯状捲縮が混在していた。そして、得られた複合繊維をTm−3℃(127℃)で30秒間熱処理をしたときの捲縮状態は、L=1.40、H/L=0.83の波線状捲縮および螺旋状捲縮が発現していた。Tm−3℃(127℃)における乾熱収縮率は9.5%であった。
[Comparative Example 7]
A crimped conjugate fiber was obtained in the same manner as in Example 1 except that the annealing treatment was performed at 70 ° C. The crimped state at this time was a mixture of wavy crimps and sawtooth crimps of L = 2.25 and H / L = 0.45. The crimped state when the obtained conjugate fiber was heat-treated at Tm-3 ° C. (127 ° C.) for 30 seconds was a wavy crimp and a spiral shape of L = 1.40 and H / L = 0.83. Crimp was expressed. The dry heat shrinkage rate at Tm-3 ° C. (127 ° C.) was 9.5%.

実施例1〜2、および比較例1〜7の捲縮性複合繊維を以下の方法で不織布化し、嵩高性および圧縮柔らかさを以下の方法で測定した。ただし、比較例7の捲縮性複合繊維を用いた不織布は、熱処理した際に急激なウェブ収縮を伴い、地合の乱れた不織布しか得られなかった。   The crimped conjugate fibers of Examples 1 and 2 and Comparative Examples 1 to 7 were made into a nonwoven fabric by the following method, and the bulkiness and compression softness were measured by the following methods. However, the nonwoven fabric using the crimpable conjugate fiber of Comparative Example 7 was accompanied by rapid web shrinkage when heat-treated, and only a nonwoven fabric with a disordered formation was obtained.

[嵩高性]
捲縮性複合繊維100mass%をパラレルカードに掛けウェブを採取し、熱風循環式の熱処理機を用い、加工温度134℃(実施例2のみ145℃)で30秒間熱処理して鞘成分を熱融着させ、目付約100g/m2の不織布とした。得られた不織布を縦横それぞれ10cm角に切り、1000g/m2にしたときの高さT0(cm)を測定した。
[Bulky]
A web is obtained by applying 100 mass% of crimped conjugate fiber to a parallel card, and using a hot-air circulating heat treatment machine, heat treatment is performed for 30 seconds at a processing temperature of 134 ° C. (145 ° C. only in Example 2), and the sheath component is heat-sealed. A nonwoven fabric having a basis weight of about 100 g / m 2 was obtained. The obtained non-woven fabric was cut into 10 cm squares in the vertical and horizontal directions, and the height T 0 (cm) when measured at 1000 g / m 2 was measured.

[圧縮柔らかさ]
前記目付約100g/m2の不織布を、カトーテック(株)製の圧縮試験機(KES−G5)にて、2cm2の円盤を1mm/secの速度で、不織布厚みが1mmになるまで圧縮したときの荷重(N)で評価した。
[Compression softness]
The basis weight of approximately 100 g / m 2 nonwoven, Kato Tech Co., Ltd. compression tester at (KES-G5), a 2 cm 2 disc at a speed of 1mm / sec, was compressed to the nonwoven thickness is 1mm The load (N) at the time was evaluated.

実施例1〜2、比較例1〜6の単繊維および不織布の性能を表1に示す。   Table 1 shows the performance of the single fibers and nonwoven fabrics of Examples 1 and 2 and Comparative Examples 1 to 6.

Figure 0004589417
Figure 0004589417

表1に示すように、実施例1および2の不織布は、比較例1と比べ高い初期嵩、初期嵩回復性、および長期嵩回復性を有しており、比較例2と比べ高い長期嵩回復性、および圧縮柔らかさを有しており、比較例3と比べ高い初期嵩回復性を有していた。また、比較例4〜6と比べ高い初期嵩回復性、および長期嵩回復性を有していた。   As shown in Table 1, the nonwoven fabrics of Examples 1 and 2 have high initial bulk, initial bulk recovery, and long-term bulk recovery compared to Comparative Example 1, and high long-term bulk recovery compared to Comparative Example 2. And high initial bulk recovery as compared with Comparative Example 3. Moreover, it had high initial bulk recoverability and long-term bulk recoverability compared with Comparative Examples 4-6.

本発明の不織布は、衛生材料、包装材、ウェットティッシュ、フィルター、ワイパー、硬綿、椅子等に好適である。   The nonwoven fabric of the present invention is suitable for sanitary materials, packaging materials, wet tissues, filters, wipers, hard cotton, chairs and the like.

本発明の捲縮性複合繊維の繊維断面の一例を示す。An example of the fiber cross section of the crimpable conjugate fiber of this invention is shown. 本発明の捲縮性複合繊維が捲縮発現したときの捲縮形態を示す。The crimp form when the crimpable conjugate fiber of the present invention is crimped is shown. 通常の複合繊維の捲縮形態を示す。The crimp form of a normal composite fiber is shown. 本発明の捲縮性複合繊維の捲縮形態を示す。The crimp form of the crimpable conjugate fiber of the present invention is shown.

符号の説明Explanation of symbols

1.第1成分
2.第2成分
3.第1成分の重心位置C1
4.複合繊維の重心位置Cf
5.複合繊維の半径rf
6.波線状捲縮
7.螺旋状捲縮
8.波線状捲縮と螺旋状捲縮が混在した捲縮
9.鋸歯状捲縮
10.捲縮の一山間の長さL
11.捲縮の山の高さH
12.鋸歯状捲縮と波線状捲縮が混在した捲縮
1. First component Second component 2. Center-of-gravity position C1 of the first component
4). Center of gravity Cf of composite fiber
5). Radius of composite fiber rf
6). 6. Wavy crimp 7. Spiral crimp 8. Crimp mixed with wavy crimp and spiral crimp Serrated crimp 10. Length L of crimped mountain
11. Crimped mountain height H
12 Crimp with mixed sawtooth and wavy crimp

Claims (6)

ポリトリメチレンテレフタレート系樹脂を含有する第1成分と、前記第1成分の融点よりも20℃以上融点が低いポリオレフィン系樹脂を含有する第2成分から構成され、繊維断面において第2成分が繊維表面の50〜100%を占め、第1成分の重心位置が繊維の重心位置からずれており、偏心率が5〜50%である複合繊維からなり、
前記複合繊維は、捲縮数が7個/25mm以上、25個/25mm以下の鋸歯状捲縮と波線状捲縮が混在した捲縮、または鋸歯状捲縮と螺旋状捲縮が混在した捲縮を有しており、
前記複合繊維は、第2成分の融点をTm(℃)としたとき、Tm−3(℃)において下記式(1)及び(2)の範囲を満たす波線状捲縮および螺旋状捲縮から選ばれた少なくとも一種の捲縮を有しており、Tm−3(℃)における乾熱収縮率が3%以下である捲縮性複合繊維。
(1)0.8<L<5
(2)0.4<H/L<0.9
L:捲縮の一山間の長さ(mm)
H:捲縮の山の高さ(mm)
It is composed of a first component containing a polytrimethylene terephthalate resin and a second component containing a polyolefin resin having a melting point of 20 ° C. or more lower than the melting point of the first component. accounting for 50% to 100% of the center of gravity of the first component are displaced from the center position of the fiber, the eccentricity of not more composite fibers is 5-50%,
The composite fiber has a crimp number of 7/25 mm or more and 25/25 mm or less mixed with a serrated crimp and a wavy crimp, or a mixed crimp of a serrated crimp and a spiral crimp. Have shrinkage,
The composite fiber is selected from wavy crimps and spiral crimps satisfying the range of the following formulas (1) and (2) at Tm-3 (° C.) when the melting point of the second component is Tm (° C.) A crimped conjugate fiber which has at least one kind of crimp and has a dry heat shrinkage of 3% or less at Tm-3 (° C).
(1) 0.8 <L <5
(2) 0.4 <H / L <0.9
L: Length between crimped mountains (mm)
H: Height of crimped mountain (mm)
前記ポリオレフィン系樹脂が、高密度ポリエチレン、エチレン−プロピレン共重合体、およびエチレン−ブテン−1−プロピレン三元共重合体から選ばれた少なくとも1種である、請求項1に記載の捲縮性複合繊維。 The crimpable composite according to claim 1, wherein the polyolefin-based resin is at least one selected from high-density polyethylene, ethylene-propylene copolymer, and ethylene-butene-1-propylene terpolymer. fiber. ポリトリメチレンテレフタレート系樹脂を含有する第1成分と、前記第1成分の融点よりも20℃以上融点が低いポリオレフィン系樹脂を含有する第2成分からなり、繊維断面において第2成分が繊維表面の50〜100%を占め、第1成分の重心位置が繊維の重心位置からずれるように配置された複合型ノズルを用いて溶融紡糸し、
得られた紡糸フィラメントを延伸倍率1.8倍以上で延伸処理を施し、
捲縮数5個/25mm以上、25個/25mm以下の鋸歯状捲縮を付与した後、
温度90〜130℃の雰囲気下でアニーリング処理を施して、捲縮数が7個/25mm以上、25個/25mm以下の鋸歯状捲縮と波線状捲縮が混在した捲縮、または鋸歯状捲縮と螺旋状捲縮が混在した捲縮とした複合繊維であり、
前記複合繊維の偏心率が5〜50%であり、
前記複合繊維における第2成分の融点をTm(℃)としたとき、Tm−3(℃)において下記式(1)及び(2)の範囲を満たす波線状捲縮および螺旋状捲縮から選ばれた少なくとも一種の捲縮を有し、Tm−3(℃)における乾熱収縮率を3%以下とする捲縮性複合繊維の製造方法。
(1)0.8<L<5
(2)0.4<H/L<0.9
L:捲縮の一山間の長さ(mm)
H:捲縮の山の高さ(mm)
A first component containing a polytrimethylene terephthalate resin and a second component containing a polyolefin resin having a melting point of 20 ° C. or more lower than the melting point of the first component. 50% to 100% , melt spinning using a composite type nozzle arranged so that the center of gravity of the first component deviates from the center of gravity of the fiber,
The obtained spinning filament is subjected to a stretching treatment at a stretching ratio of 1.8 times or more,
After applying a serrated crimp of 5 crimps / 25 mm or more and 25/25 mm or less,
An annealing treatment is performed in an atmosphere at a temperature of 90 to 130 ° C., and the number of crimps is 7/25 mm or more and 25/25 mm or less. It is a crimped composite fiber with a mixture of crimp and spiral crimp,
The eccentricity of the composite fiber is 5 to 50%,
When the melting point of the second component in the composite fiber is Tm (° C.), it is selected from wavy crimps and spiral crimps satisfying the following formulas (1) and (2) at Tm-3 (° C.) A method for producing a crimped conjugate fiber having at least one type of crimp and having a dry heat shrinkage of 3% or less at Tm-3 (° C.).
(1) 0.8 <L <5
(2) 0.4 <H / L <0.9
L: Length between crimped mountains (mm)
H: Height of crimped mountain (mm)
請求項1または2に記載の捲縮性複合繊維を少なくとも30mass%含有する不織布。A nonwoven fabric containing at least 30 mass% of the crimped conjugate fiber according to claim 1 or 2. 請求項1または2に記載の捲縮性複合繊維を少なくとも30mass%含有する不織布であって、前記捲縮性複合繊維はカード工程を通過した後に、波線状捲縮および螺旋状捲縮から選ばれた少なくとも一種の捲縮が発現している不織布。 A nonwoven fabric containing at least 30 mass% of the crimped conjugate fiber according to claim 1 or 2 , wherein the crimped conjugate fiber is selected from a wavy crimp and a spiral crimp after passing through the card process. Non-woven fabric in which at least one kind of crimp is expressed. 前記捲縮性複合繊維の第2成分が溶融して、構成する繊維同士が熱融着されている、請求項4または5に記載の不織布。 The nonwoven fabric according to claim 4 or 5, wherein the second component of the crimped conjugate fiber is melted and the constituent fibers are heat-sealed.
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JP2010077549A (en) * 2008-09-24 2010-04-08 Unitika Ltd Core-sheath type conjugate filament
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JP2000256920A (en) * 1999-03-10 2000-09-19 Teijin Ltd Thermo-adhesive polyester conjugate fiber
JP4104299B2 (en) * 2001-06-22 2008-06-18 大和紡績株式会社 Crimpable composite fiber, method for producing the same, and nonwoven fabric using the same

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JP2000256920A (en) * 1999-03-10 2000-09-19 Teijin Ltd Thermo-adhesive polyester conjugate fiber
JP4104299B2 (en) * 2001-06-22 2008-06-18 大和紡績株式会社 Crimpable composite fiber, method for producing the same, and nonwoven fabric using the same

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