JP4476724B2 - Method for producing drawn extracted fiber, drawn extracted fiber, and nonwoven fabric - Google Patents
Method for producing drawn extracted fiber, drawn extracted fiber, and nonwoven fabric Download PDFInfo
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Description
本発明は延伸抽出繊維の製造方法、延伸抽出繊維、及び不織布に関する。 The present invention relates to a method for producing a stretched extracted fiber, a stretched extracted fiber, and a nonwoven fabric.
繊維径の小さい繊維を濾過材を構成する繊維として使用すると、微細な固体を濾過することができる。繊維の繊維径が小さければ小さい程、より濾過性能が向上すると考えられるため、濾過材を構成する繊維として、繊維径のより小さい繊維を使用するのが好ましい。また、この繊維は耐薬品性やエレクトレット性などの点で優れているポリオレフィン系樹脂から構成されているのが好ましい。 When a fiber having a small fiber diameter is used as a fiber constituting the filter medium, a fine solid can be filtered. It is considered that the smaller the fiber diameter is, the more the filtration performance is improved. Therefore, it is preferable to use a fiber having a smaller fiber diameter as the fiber constituting the filter medium. Moreover, it is preferable that this fiber is comprised from the polyolefin-type resin which is excellent in points, such as chemical resistance and electret property.
また、繊維径の小さい繊維を電池用セパレータを構成する繊維として使用すると、電気絶縁性に優れるとともに、電解液の保持性に優れているため、好適に使用できる。また、この場合も繊維は耐電解液性に優れているポリオレフィン系樹脂から構成されているのが好ましい。 Further, when a fiber having a small fiber diameter is used as a fiber constituting the battery separator, it can be suitably used because it has excellent electrical insulation and electrolyte retention. Also in this case, it is preferable that the fiber is made of a polyolefin-based resin having excellent electrolytic solution resistance.
そのため、本願出願人はポリオレフィン系樹脂の１つであるポリプロピレンからなる極細繊維を発生できる極細繊維発生可能繊維として、融点が１６６℃以上の高融点ポリプロピレンを島成分とする海島型繊維を提案した（特許文献１）。 Therefore, the applicant of the present application has proposed a sea-island type fiber having a high melting point polypropylene having a melting point of 166 ° C. or higher as an island component as an ultrafine fiber-generating fiber capable of generating an ultrafine fiber made of polypropylene which is one of polyolefin resins ( Patent Document 1).
このような極細繊維発生可能繊維を切断し、抽出して極細繊維を発生させると、極細繊維同士が圧着していない状態の極細繊維を発生させることができ、極細繊維を均一に分散させることができるため、濾過性能や電気絶縁性能等に優れる濾過材や電池用セパレータを製造できるものであった。 By cutting and extracting such ultrafine fibers that can be generated to generate ultrafine fibers, it is possible to generate ultrafine fibers in a state in which the ultrafine fibers are not bonded together, and to disperse the ultrafine fibers uniformly. Therefore, it was possible to produce a filtering material and a battery separator excellent in filtering performance and electrical insulation performance.
近年、繊維径の小さい繊維を含む濾過材や電池用セパレータなどの不織布に対する更なる要求物性として、従来以上に強度の優れるものが要求されている。そのため、従来の極細繊維のような繊維径の小さい繊維の引張り強さが高ければ、繊維径の小さい繊維を含む不織布の強度もより優れるものとなると予測されるため、引張り強さが強く、繊維径の小さい繊維が待ち望まれていた。 In recent years, as a further required physical property for non-woven fabrics such as a filter medium containing a fiber having a small fiber diameter and a battery separator, a material having higher strength than before has been required. Therefore, if the tensile strength of a fiber having a small fiber diameter such as a conventional ultrafine fiber is high, the strength of a nonwoven fabric including a fiber having a small fiber diameter is expected to be superior. A fiber with a small diameter has been awaited.
そのため、本発明は引張り強さの高い延伸抽出繊維の製造方法、引張り強さの高い延伸抽出繊維、及び強度の優れる不織布を提供することを目的とする。 Therefore, an object of this invention is to provide the manufacturing method of the stretch extraction fiber with high tensile strength, the stretch extraction fiber with high tensile strength, and the nonwoven fabric excellent in intensity | strength.
本発明者らは従来の繊維径の小さい繊維を製造する方法について検討したところ、未延伸複合繊維を延伸して延伸複合繊維とした後に樹脂成分を除去することによって繊維径の小さい繊維を製造していることに起因することを見出した。つまり、未延伸複合繊維は少なくとも２種類の樹脂から構成されており、個々の樹脂によって好適な延伸温度が異なるが、いずれの樹脂も損傷しない条件で延伸する必要があるため、十分に延伸できないことによって、十分な引張り強さをもった繊維径の小さい繊維を製造できないことを見出したのである。 The present inventors examined a conventional method for producing a fiber having a small fiber diameter, and produced a fiber having a small fiber diameter by removing an unstretched composite fiber to obtain a stretched composite fiber and then removing the resin component. I found out that it is due to that. In other words, the unstretched composite fiber is composed of at least two types of resins, and suitable stretching temperatures differ depending on the individual resins, but it is necessary to stretch under conditions that do not damage any of the resins, so that they cannot be sufficiently stretched. Thus, it has been found that a fiber having a small fiber diameter having sufficient tensile strength cannot be produced.
本発明は上記の知見に基いて、未延伸複合繊維の樹脂成分を除去して残留した樹脂成分からなる繊維径の小さい未延伸残留繊維を延伸することによって、優れた引張り強さをもち、繊維径の小さい繊維を製造できることを見出したものである。 Based on the above knowledge, the present invention has an excellent tensile strength by stretching unstretched residual fiber having a small fiber diameter, which is formed by removing the resin component of the unstretched composite fiber and remaining. It has been found that a fiber having a small diameter can be produced.
つまり、本発明の請求項１にかかる発明は、「所定の溶液によって除去可能な第１の樹脂成分及び前記溶液によって除去が困難な第２の樹脂成分を含む未延伸複合繊維を紡糸する紡糸工程、前記未延伸複合繊維を前記溶液で処理し、前記第１の樹脂成分を除去して、第２の樹脂成分からなる未延伸抽出繊維束を形成する抽出工程、前記未延伸抽出繊維束を延伸して延伸抽出繊維を形成する延伸工程、とを備えていることを特徴とする、延伸抽出繊維の製造方法」である。このように、未延伸複合繊維の第１の樹脂成分を除去した後に、第２の樹脂成分からなる未延伸抽出繊維束を好適な温度で高延伸できるため、優れた引張り強さをもち、繊維径の小さい延伸抽出繊維を製造することができる。 In other words, the invention according to claim 1 of the present invention is “a spinning process of spinning an unstretched composite fiber containing a first resin component that can be removed by a predetermined solution and a second resin component that is difficult to remove by the solution. An extraction step of treating the unstretched conjugate fiber with the solution to remove the first resin component to form an unstretched extracted fiber bundle composed of a second resin component; stretching the unstretched extracted fiber bundle And a drawing step for forming drawn and extracted fibers, ”a method for producing drawn and extracted fibers”. Thus, after removing the first resin component of the unstretched composite fiber, the unstretched extracted fiber bundle made of the second resin component can be highly stretched at a suitable temperature, so that the fiber has excellent tensile strength, A stretch-extracted fiber having a small diameter can be produced.
本発明の請求項２にかかる発明は、「延伸抽出繊維が、繊維径が４μｍ以下、かつ引張り強さが３ｃＮ／ｄｔｅｘ以上のポリオレフィン系延伸抽出繊維であることを特徴とする、請求項１記載の延伸抽出繊維の製造方法」である。この製造方法によれば、耐薬品性やエレクトレット性などの点で優れ、しかも優れた引張り強さをもち、繊維径の小さいポリオレフィン系延伸抽出繊維を製造できる。このポリオレフィン系延伸抽出繊維は濾過材や電池用セパレータ用に使用できるなど、汎用性の高いものである。 The invention according to claim 2 of the present invention is as follows: “The drawn and extracted fiber is a polyolefin-based drawn and extracted fiber having a fiber diameter of 4 μm or less and a tensile strength of 3 cN / dtex or more. Is a method for producing a stretch-extracted fiber. According to this production method, it is possible to produce a polyolefin-based stretched and extracted fiber having excellent chemical resistance and electret properties, and having excellent tensile strength and a small fiber diameter. This polyolefin-based stretched and extracted fiber is highly versatile, and can be used for filter media and battery separators.
本発明の請求項３にかかる発明は、「延伸抽出繊維がポリプロピレンからなることを特徴とする、請求項１又は請求項２に記載の延伸抽出繊維の製造方法」である。ポリプロピレンは比較的融点が高く耐熱性に優れているため、耐熱性に優れる延伸抽出繊維を製造することができる。この延伸抽出繊維を使用した不織布は耐熱性を必要とする用途に好適に使用できる。 The invention according to claim 3 of the present invention is "the method for producing stretched extract fiber according to claim 1 or 2, wherein the stretched extract fiber is made of polypropylene". Since polypropylene has a relatively high melting point and excellent heat resistance, it is possible to produce drawn and extracted fibers having excellent heat resistance. Nonwoven fabrics using this drawn and extracted fiber can be suitably used for applications that require heat resistance.
本発明の請求項４にかかる発明は、「延伸抽出繊維がポリプロピレンとポリエチレンとからなることを特徴とする、請求項１又は請求項２に記載の延伸抽出繊維の製造方法」である。延伸抽出繊維がポリプロピレンとポリエチレンとからなる、つまり未延伸抽出繊維束を構成する個々の未延伸抽出繊維がポリプロピレンとポリエチレンとからなる場合であっても、可塑化し変形する温度が比較的近く、好適な温度で高延伸できるため、優れた引張り強さをもち、繊維径の小さい延伸抽出繊維を製造することができる。 The invention according to claim 4 of the present invention is "the method for producing stretched extract fiber according to claim 1 or 2, wherein the stretched extract fiber is made of polypropylene and polyethylene". Even if the drawn and extracted fibers are made of polypropylene and polyethylene, that is, the individual undrawn extracted fibers constituting the undrawn extracted fiber bundle are made of polypropylene and polyethylene, the plasticizing and deforming temperatures are relatively close and suitable. Since it can be drawn at a high temperature, drawn extracted fibers having excellent tensile strength and a small fiber diameter can be produced.
本発明の請求項５にかかる発明は、「第１の樹脂成分が２００℃以下の融点を有することを特徴とする、請求項３又は請求項４に記載の延伸抽出繊維の製造方法。」である。第１の樹脂成分の融点が２００℃以下であることによって、未延伸複合繊維を比較的低温で紡糸することができ、紡糸の際にポリプロピレン及びポリエチレンが熱による影響を受けにくいため、延伸によって引張り強さのより優れる延伸抽出繊維を製造できる。 The invention according to claim 5 of the present invention is “the method for producing drawn-extracted fibers according to claim 3 or 4, wherein the first resin component has a melting point of 200 ° C. or lower”. is there. When the melting point of the first resin component is 200 ° C. or lower, unstretched composite fibers can be spun at a relatively low temperature, and polypropylene and polyethylene are not easily affected by heat during spinning. It is possible to produce drawn and extracted fibers having a higher strength.
本発明の請求項６にかかる発明は、「第１の樹脂成分がポリ乳酸であることを特徴とする、請求項５に記載の延伸抽出繊維の製造方法」である。ポリ乳酸は生分解性であり、環境へ与える負荷が小さいという特徴を有する。 The invention according to claim 6 of the present invention is “the method for producing a stretch-extracted fiber according to claim 5, wherein the first resin component is polylactic acid”. Polylactic acid is biodegradable and has a feature of low impact on the environment.
本発明の請求項７にかかる発明は、「延伸工程後、更に延伸抽出繊維を切断して短繊維とする切断工程を備えていることを特徴とする、請求項１〜請求項６のいずれかに記載の延伸抽出繊維の製造方法」である。本発明の延伸抽出繊維は十分に延伸されており、高度に結晶配向しているため、切断性に優れ、延伸抽出繊維同士を圧着させることなく切断することができる。したがって、延伸抽出繊維が均一に分散した不織布を製造することができる。 Invention of Claim 7 of this invention is equipped with the cutting process which cut | disconnects an extraction extraction fiber further and makes it a short fiber after the extending process, It is any one of Claims 1-6 characterized by the above-mentioned. The manufacturing method of the stretched-extracted fiber as described in 1). Since the stretch-extracted fiber of the present invention is sufficiently stretched and highly crystallized, the stretch-extracted fiber is excellent in cutting property, and can be cut without causing the stretch-extracted fibers to be pressed together. Therefore, a nonwoven fabric in which stretched and extracted fibers are uniformly dispersed can be produced.
本発明の製造方法によれば、引張り強さの高い延伸抽出繊維を製造することができる。 According to the production method of the present invention, stretched and extracted fibers having high tensile strength can be produced.
本発明の延伸抽出繊維は引張り強さに優れ、繊維径の小さい繊維であることができる。 The drawn and extracted fiber of the present invention can be a fiber having excellent tensile strength and a small fiber diameter.
本発明の不織布は緻密な構造をもち、電気絶縁性や濾過性等に優れ、強度の優れる不織布であることができる。 The nonwoven fabric of the present invention can be a nonwoven fabric having a dense structure, excellent electrical insulation properties, filterability, etc., and excellent strength.
本発明の延伸抽出繊維の製造方法においては、まず、所定の溶液によって除去可能な第１の樹脂成分及び前記溶液によって除去が困難な第２の樹脂成分を含む未延伸複合繊維を紡糸する紡糸工程、を実施する。この未延伸複合繊維における「除去可能」とは、所定の溶液によって樹脂成分の９５ｍａｓｓ％以上を除去できることをいい、「除去が困難」とは、第１の樹脂成分を除去する条件下において樹脂成分の３０ｍａｓｓ％以下しか除去されないことをいう。 In the method for producing stretched and extracted fibers of the present invention, first, a spinning step of spinning an unstretched composite fiber containing a first resin component that can be removed by a predetermined solution and a second resin component that is difficult to remove by the solution. Execute. “Removable” in the unstretched conjugate fiber means that 95% by mass or more of the resin component can be removed by a predetermined solution, and “difficult to remove” means that the resin component is removed under the condition of removing the first resin component. It means that only 30 mass% or less of the above is removed.
このような未延伸複合繊維の具体例としては、アルカリ水溶液（例えば、水酸化ナトリウム溶液）に対して除去可能な（つまり第１の樹脂成分）ポリエステル（例えば、ポリエチレンテレフタレート、ポリエチレンテレフタレート系共重合体、ポリブチレンテレフタレート、ポリブチレンテレフタレート系共重合体、ポリグリコール酸、グリコール酸共重合体、ポリ乳酸、乳酸共重合体など）と、アルカリ水溶液に対して除去が困難な（つまり第２の樹脂成分）ポリオレフィン系樹脂又はポリアミド系樹脂との組合せを挙げることができる。 Specific examples of such unstretched composite fibers include polyester (for example, polyethylene terephthalate, polyethylene terephthalate copolymer) that can be removed (that is, the first resin component) with respect to an alkaline aqueous solution (for example, sodium hydroxide solution). , Polybutylene terephthalate, polybutylene terephthalate copolymer, polyglycolic acid, glycolic acid copolymer, polylactic acid, lactic acid copolymer, etc.) and difficult to remove from alkaline aqueous solution (that is, second resin component) ) A combination with a polyolefin resin or a polyamide resin can be mentioned.
なお、第２の樹脂成分がポリプロピレンやポリエチレンなどの融点が低い樹脂成分の場合、第１の樹脂成分が２００℃以下の融点を有するものであると、未延伸複合繊維の紡糸を比較的低温で行うことができ、紡糸の際にポリプロピレン及びポリエチレンが熱による影響を受けにくく、延伸によって引張り強さの優れる延伸抽出繊維を製造しやすいため好適な組合せである。このような第１の樹脂成分としてポリ乳酸を挙げることができ、ポリ乳酸は前記性能に優れているばかりでなく、生分解性であるため、環境へ与える負荷が小さい、という特徴も有する。なお、本発明における「融点」は示差走査熱量計を用い、昇温速度１０℃／分で室温から昇温して得られる融解吸熱曲線の極大値を与える温度をいう。 In addition, when the second resin component is a resin component having a low melting point such as polypropylene or polyethylene, the spinning of the unstretched composite fiber can be performed at a relatively low temperature if the first resin component has a melting point of 200 ° C. or less. This is a suitable combination because polypropylene and polyethylene are not easily affected by heat during spinning, and it is easy to produce drawn extracted fibers having excellent tensile strength by drawing. Polylactic acid can be mentioned as such a first resin component, and polylactic acid is not only excellent in the above-mentioned performance, but also has a feature that it has a small load on the environment because it is biodegradable. The “melting point” in the present invention refers to a temperature that gives a maximum value of a melting endothermic curve obtained by heating from room temperature at a heating rate of 10 ° C./min using a differential scanning calorimeter.
本発明の未延伸複合繊維の第２の樹脂成分がポリオレフィン系樹脂からなると、ポリオレフィン系延伸抽出繊維を製造でき、このポリオレフィン系延伸抽出繊維は耐薬品性やエレクトレット性などの点で優れ、汎用性に優れているため好適である。なお、第２の樹脂成分を構成できるポリオレフィン系樹脂としては、例えば、ポリプロピレン、ポリエチレン（例えば、高密度ポリエチレン、低密度ポリエチレン、直鎖状低密度ポリエチレンなど）、ポリ４−メチルペンテン−１等のホモポリマーや、プロピレンとα−オレフィン（例えば、エチレン、ブテン−１等）との共重合体、エチレンとブテン−１との共重合体などを挙げることができる。これらの中でもポリプロピレンは比較的融点が高く耐熱性に優れており、また、紡糸性、延伸性に優れ、優れた引張り強さをもつ延伸抽出繊維を製造しやすいため好適に使用できる。 When the second resin component of the unstretched composite fiber of the present invention is made of a polyolefin resin, it is possible to produce a polyolefin-based stretch-extracted fiber. It is preferable because of its excellent resistance. The polyolefin resin that can constitute the second resin component includes, for example, polypropylene, polyethylene (for example, high density polyethylene, low density polyethylene, linear low density polyethylene, etc.), poly-4-methylpentene-1, and the like. A homopolymer, a copolymer of propylene and α-olefin (for example, ethylene, butene-1, etc.), a copolymer of ethylene and butene-1, and the like can be mentioned. Among these, polypropylene has a relatively high melting point and is excellent in heat resistance, and it can be suitably used because it is easy to produce drawn and extracted fibers having excellent spinnability and stretchability and excellent tensile strength.
この第２樹脂成分は所定溶液によって除去が困難な樹脂成分１種類からなる必要はなく、２種類以上から構成されていても良い。例えば、第２樹脂成分が２種類の樹脂からなると、第２樹脂成分から構成される延伸抽出繊維が融着性、巻縮発現性、分割性など、各種特性を有する延伸抽出繊維を製造できるため好適である。より具体的には、融点差のある２種類の樹脂から構成されていれば融着性と融着時の繊維形状保持性をもつ延伸抽出繊維を製造でき、熱収縮性の点で差のある２種類の樹脂から構成されていれば巻縮発現性をもつ延伸抽出繊維を製造でき、溶解度パラメーターの点で差の大きい２種類の樹脂から構成されていれば機械的に分割可能な延伸抽出繊維を製造できる。 The second resin component does not have to be composed of one type of resin component that is difficult to remove with a predetermined solution, and may be composed of two or more types. For example, when the second resin component is composed of two types of resins, the stretched and extracted fiber composed of the second resin component can produce stretched and extracted fibers having various characteristics such as fusibility, crimping and splitting properties. Is preferred. More specifically, if it is composed of two kinds of resins having a difference in melting point, it is possible to produce drawn and extracted fibers having a fusion property and a fiber shape retention property at the time of fusion, and there is a difference in heat shrinkability. If it is composed of two types of resins, it can produce stretch-extracted fibers that have a crimping property. If it is composed of two types of resins that have a large difference in solubility parameters, they can be mechanically divided. Can be manufactured.
特に、第２樹脂成分がポリプロピレンとポリエチレンとからなる、つまり延伸抽出繊維のもとである未延伸抽出繊維がポリプロピレンとポリエチレンとからなる場合、可塑化し変形する温度が比較的近く、好適な温度で高延伸できるため、優れた引張り強さをもち、繊維径の小さい延伸抽出繊維を製造でき、好適である。また、ポリエチレン成分が延伸抽出繊維の繊維表面の少なくとも一部を構成するように配置していると、ポリエチレン成分が融着でき、ポリエチレン成分が融着する温度ではポリプロピレン成分は融着せず、繊維形態を失うことなく融着できるため、強度の優れる不織布を製造できるとともに、延伸抽出繊維が脱落したり、毛羽立ったりしにくい不織布を製造できる。このポリエチレン成分の繊維表面を占める面積が広ければ広いほど、前記性能に優れているため、ポリエチレン成分は延伸抽出繊維の表面全体（両端を除く）を占めるように配置しているのが好ましく、具体的には横断面において芯鞘状又は海島状に配置しているのが好ましい。なお、第２樹脂成分がポリプロピレンとポリエチレンとの組合せ以外に、ポリ４−メチルペンテン−１とポリプロピレン、ポリ４−メチルペンテン−１とポリエチレン、高密度ポリエチレンと低密度ポリエチレンなどの組合せからなる場合も、ポリプロピレンとポリエチレンとの組合せの場合と同様の効果を奏する。 In particular, when the second resin component is composed of polypropylene and polyethylene, that is, when the unstretched extracted fiber that is the basis of the stretched extracted fiber is composed of polypropylene and polyethylene, the plasticizing and deforming temperatures are relatively close and at a suitable temperature. Since it can be highly drawn, it is suitable because it can produce drawn and extracted fibers having excellent tensile strength and a small fiber diameter. In addition, when the polyethylene component is arranged so as to constitute at least a part of the fiber surface of the drawn and extracted fiber, the polyethylene component can be fused, and at the temperature at which the polyethylene component is fused, the polypropylene component is not fused, and the fiber form Therefore, it is possible to produce a nonwoven fabric with excellent strength, and it is possible to produce a nonwoven fabric in which stretched and extracted fibers are less likely to fall off or fluff. The larger the area of the polyethylene component that occupies the fiber surface, the better the performance. Therefore, the polyethylene component is preferably arranged so as to occupy the entire surface (excluding both ends) of the drawn extracted fiber. Specifically, it is preferably arranged in a core-sheath shape or a sea-island shape in the cross section. In addition to the combination of polypropylene and polyethylene, the second resin component may be a combination of poly-4-methylpentene-1 and polypropylene, poly-4-methylpentene-1 and polyethylene, high-density polyethylene and low-density polyethylene, or the like. The same effect as in the case of a combination of polypropylene and polyethylene is obtained.
本発明の未延伸複合繊維における第１の樹脂成分と第２の樹脂成分との繊維断面における配置状態は特に限定するものではないが、例えば、海島状配置、花弁状配置、小判状配置などを挙げることができる。これらの中でもより繊維径の小さい延伸抽出繊維を製造しやすい海島状配置であるのが好ましい。また、第２の樹脂成分の横断面形状（つまり延伸抽出繊維の横断面形状）は、円形又は非円形（例えば、楕円状、長円状、Ｔ状、Ｙ状、＋状、中空状、多角形状など）であることができる。なお、未延伸複合繊維は、例えば、吸湿剤、艶消し剤、顔料、難燃剤、安定剤、帯電防止剤、着色剤、染色剤、導電剤、親水化剤、脱臭剤、或いは抗菌剤などの機能性物質を含んでいても良い。 Although the arrangement state in the fiber cross section of the first resin component and the second resin component in the unstretched composite fiber of the present invention is not particularly limited, for example, sea island arrangement, petal arrangement, oval arrangement, etc. Can be mentioned. Among these, a sea-island arrangement is preferable in which stretched and extracted fibers having a smaller fiber diameter can be easily produced. In addition, the cross-sectional shape of the second resin component (that is, the cross-sectional shape of the drawn extracted fiber) is circular or non-circular (for example, elliptical, oval, T-shaped, Y-shaped, + -shaped, hollow, polygonal Shape). The unstretched composite fiber is, for example, a hygroscopic agent, a matting agent, a pigment, a flame retardant, a stabilizer, an antistatic agent, a coloring agent, a dyeing agent, a conductive agent, a hydrophilizing agent, a deodorizing agent, or an antibacterial agent. It may contain a functional substance.
このような未延伸複合繊維の紡糸は常法の溶融紡糸法により実施できる。好適である海島状未延伸複合繊維を紡糸する場合には、繊維径の揃った延伸抽出繊維を製造できるように、混合紡糸法ではなく、複合紡糸法により紡糸するのが好ましい。なお、ポリエチレンとポリプロピレンとからなる延伸抽出繊維を製造できる未延伸複合繊維は、例えば、ポリエチレンとポリプロピレンを混合した状態で、又は複合した状態で、第２の樹脂成分の占める領域へ供給して形成できる。 Such spinning of unstretched composite fibers can be performed by a conventional melt spinning method. When spinning an unsealed unstretched composite fiber that is suitable, it is preferable to spin by a composite spinning method rather than a mixed spinning method so that stretched and extracted fibers having a uniform fiber diameter can be produced. In addition, the unstretched conjugate fiber that can produce a stretched and extracted fiber composed of polyethylene and polypropylene is formed, for example, by supplying to the region occupied by the second resin component in a mixed state or in a composite state of polyethylene and polypropylene. it can.
次いで、未延伸複合繊維を第１の樹脂成分を除去可能な溶液で処理し、前記第１の樹脂成分を除去して、第２の樹脂成分からなる未延伸抽出繊維束を形成する抽出工程を実施する。例えば、第１の樹脂成分がポリエステル系樹脂からなり、第２の樹脂成分がポリオレフィン系樹脂又はポリアミド系樹脂からなる未延伸複合繊維の場合には、アルカリ水溶液によりポリエステル系樹脂を除去し、未延伸ポリオレフィン系抽出繊維束又はポリアミド系抽出繊維束を形成する。なお、除去方法としては、例えば、チーズ染色機を用い、穴あきボビンに未延伸複合繊維を巻き付けた状態で、アルカリ水溶液等の溶液を循環させる方法、懸垂型のかせ染色機を用いる方法、などを挙げることができる。 Next, an unstretched composite fiber is treated with a solution capable of removing the first resin component, and the first resin component is removed to form an unstretched extracted fiber bundle composed of the second resin component. carry out. For example, in the case of an unstretched composite fiber in which the first resin component is made of a polyester resin and the second resin component is made of a polyolefin resin or a polyamide resin, the polyester resin is removed with an alkaline aqueous solution, and unstretched A polyolefin-based extracted fiber bundle or a polyamide-based extracted fiber bundle is formed. In addition, as a removal method, for example, using a cheese dyeing machine, a method of circulating a solution such as an alkaline aqueous solution in a state where an unstretched composite fiber is wound around a perforated bobbin, a method using a suspension type skein dyeing machine, etc. Can be mentioned.
そして、未延伸抽出繊維束を延伸して延伸抽出繊維を形成する延伸工程を実施して、延伸抽出繊維を製造することができる。本発明においては、第２の樹脂成分からなる未延伸抽出繊維束を好適な温度で高延伸できるため、優れた引張り強さをもち、繊維径の小さい延伸抽出繊維を製造することができる。 And an extending | stretching extraction fiber bundle can be manufactured by implementing the extending | stretching process which extends | stretches an unstretched extraction fiber bundle and forms a stretch extraction fiber. In the present invention, since an unstretched extracted fiber bundle made of the second resin component can be highly stretched at a suitable temperature, a stretched extracted fiber having excellent tensile strength and a small fiber diameter can be produced.
なお、延伸方法は、未延伸抽出繊維束を延伸できる方法であれば特に限定されないが、例えば、レーザーを照射しながら延伸する方法、絶対圧が２ｋｇ／ｃｍ２以上の加圧飽和水蒸気雰囲気下で延伸する方法（特開平１１−３５０２８３号に記載の延伸方法）、熱水中で延伸する方法、などにより実施できる。なお、延伸時の温度は可塑化し変形する温度±１０℃で行うのが好ましく、未延伸抽出繊維束が未延伸ポリプロピレン抽出繊維束からなる場合には、１２０℃前後で延伸するのが好ましい。また、この際の延伸倍率は、強度の優れる延伸抽出繊維を製造しやすいように、５倍以上の高倍率であるのが好ましく、７倍以上であるのがより好ましく、１０倍以上であるのが更に好ましい。なお、未延伸抽出繊維束がポリプロピレンとポリエチレンとを含む場合であっても、これら樹脂の可塑化変形温度が比較的近いため、１０５℃前後の温度で、延伸倍率５倍以上の高倍率で延伸し、強度の優れる延伸抽出繊維を製造できる。 The stretching method is not particularly limited as long as the unstretched extracted fiber bundle can be stretched. For example, a stretching method while irradiating a laser, in a pressurized saturated water vapor atmosphere with an absolute pressure of 2 kg / cm 2 or more. It can be carried out by a stretching method (stretching method described in JP-A No. 11-350283), a stretching method in hot water, or the like. The stretching temperature is preferably plasticized and deformed at a temperature of ± 10 ° C. When the unstretched extracted fiber bundle is composed of an unstretched polypropylene extracted fiber bundle, it is preferably stretched at around 120 ° C. In addition, the draw ratio at this time is preferably a high ratio of 5 times or more, more preferably 7 times or more, and more preferably 10 times or more so that a stretch-extracted fiber having excellent strength can be easily produced. Is more preferable. Even if the unstretched extracted fiber bundle contains polypropylene and polyethylene, the plasticizing deformation temperatures of these resins are relatively close, so that the resin is stretched at a high magnification of 5 times or more at a temperature around 105 ° C. In addition, stretched and extracted fibers having excellent strength can be produced.
本発明の繊維径の小さい延伸抽出繊維は上述の方法により製造できるが、延伸工程後、必要に応じて、延伸抽出繊維をギロチンカッター、ロータリーカッター、押切りカッターなどを用いて、所望長さに切断して短繊維とする切断工程を実施することができる。本発明の延伸抽出繊維は十分に延伸されており、高度に結晶配向しているため、切断性に優れ、延伸抽出繊維同士を圧着させることなく、切断することができる。したがって、延伸抽出繊維が均一に分散し、地合いの優れる不織布を製造することができる。なお、繊維長は特に限定するものではないが、湿式不織布構成繊維とする場合には、０．５〜２０ｍｍであるのが好ましい。また、延伸抽出繊維を切断する場合、延伸抽出繊維同士の圧着をより効果的に防止できるように、延伸抽出繊維に油剤を付与した状態で切断するのが好ましい。 The stretched and extracted fiber having a small fiber diameter according to the present invention can be produced by the above-described method. After the stretching process, the stretched and extracted fiber is adjusted to a desired length by using a guillotine cutter, a rotary cutter, a press cutter, etc., if necessary. A cutting step of cutting into short fibers can be performed. Since the stretch-extracted fiber of the present invention is sufficiently stretched and has a high crystal orientation, it has excellent cutting properties and can be cut without causing the stretch-extracted fibers to be pressed together. Therefore, a stretched and extracted fiber can be uniformly dispersed to produce a nonwoven fabric with excellent texture. In addition, although fiber length is not specifically limited, When setting it as a wet nonwoven fabric structure fiber, it is preferable that it is 0.5-20 mm. Moreover, when cut | disconnecting a stretch extraction fiber, it is preferable to cut | disconnect in the state which provided the oil agent to the stretch extraction fiber so that the crimping | compression-bonding of stretch extraction fiber can be prevented more effectively.
本発明の延伸抽出繊維は上述の方法により製造したものであるため、優れた引張り強さをもち、繊維径の小さい延伸抽出繊維であることができる。より具体的には、延伸抽出繊維は繊維径が４μｍ以下の細い繊維であることができる。繊維径が細ければ細いほど、濾過性能、電気絶縁性能、柔軟性、隠蔽性、払拭性などの諸特性に優れる不織布を製造できるため、延伸抽出繊維の繊維径は３μｍ以下であるのが好ましく、２μｍ以下であるのがより好ましい。延伸抽出繊維の繊維径の下限は特に限定するものではないが、０．１μｍ程度が現実的である。なお、「繊維径」はＰＯ極細高強度繊維を走査型電子顕微鏡により２０００倍の倍率で撮影した電子顕微鏡写真をもとに、ノギスで計測し、１／２０００倍して算出した直径をいい、繊維断面が非円形の場合には、繊維断面積と同じ面積をもつ円の直径を繊維径とみなす。 Since the stretch-extracted fiber of the present invention is produced by the above method, it can be a stretch-extracted fiber having excellent tensile strength and a small fiber diameter. More specifically, the drawn and extracted fiber can be a thin fiber having a fiber diameter of 4 μm or less. The thinner the fiber diameter is, the more the fiber diameter of the stretched extracted fiber is preferably 3 μm or less because a nonwoven fabric excellent in various properties such as filtration performance, electrical insulation performance, flexibility, concealment, and wiping property can be produced. More preferably, it is 2 μm or less. The lower limit of the fiber diameter of the drawn extracted fiber is not particularly limited, but about 0.1 μm is realistic. “Fiber diameter” refers to a diameter calculated by measuring with a caliper and multiplying by 1/2000 based on an electron micrograph of PO ultrafine high-strength fibers taken at a magnification of 2000 times with a scanning electron microscope. When the fiber cross section is non-circular, the diameter of a circle having the same area as the fiber cross sectional area is regarded as the fiber diameter.
また、延伸抽出繊維の引張り強さは３ｃＮ／ｄｔｅｘ以上であることができる。引張り強さが強ければ強いほど、強度の優れる不織布を製造できるため、引張り強さは４ｃＮ／ｄｔｅｘ以上であるのが好ましく、５ｃＮ／ｄｔｅｘ以上であるのがより好ましく、６ｃＮ／ｄｔｅｘ以上であるのが更に好ましく、７ｃＮ／ｄｔｅｘ以上であるのが更に好ましい。なお、引張り強さの上限は特に限定するものではないが、２０ｃＮ／ｄｔｅｘ程度が現実的である。本発明の延伸抽出繊維は耐薬品性やエレクトレット性などの点で優れるポリオレフィン系樹脂から構成されているのが好ましいため、繊維径が４μｍ以下、かつ引張り強さが３ｃＮ／ｄｔｅｘ以上のポリオレフィン系延伸抽出繊維であるのが特に好ましい。この「引張り強さ」はＪＩＳ Ｌ １０１５（化学繊維ステープル試験法、定速緊張形）により測定した値をいう。 Further, the tensile strength of the drawn extracted fiber can be 3 cN / dtex or more. Since the stronger the tensile strength, the more excellent the nonwoven fabric can be produced, the tensile strength is preferably 4 cN / dtex or more, more preferably 5 cN / dtex or more, and 6 cN / dtex or more. Is more preferably 7 cN / dtex or more. In addition, although the upper limit of tensile strength is not specifically limited, about 20 cN / dtex is realistic. Since the drawn and extracted fiber of the present invention is preferably composed of a polyolefin resin excellent in chemical resistance and electret properties, the polyolefin drawn fiber having a fiber diameter of 4 μm or less and a tensile strength of 3 cN / dtex or more. Particularly preferred is an extracted fiber. The “tensile strength” refers to a value measured according to JIS L 1015 (chemical fiber staple test method, constant speed tension type).
本発明の不織布は上述のような製造方法により製造した延伸抽出繊維を含んでいる。そのため、濾過性能や電気絶縁性能等に優れているばかりでなく、強度も優れている。本発明の不織布はどのような不織布であっても良いが、湿式不織布であると地合いが優れているため好適である。特に、本発明の延伸抽出繊維は切断しても圧着しにくく、スラリー中で均一に分散できるため、地合いの優れる湿式不織布であることができる。なお、延伸抽出繊維が融点差のある２種類以上の樹脂から構成されている場合には、融着して不織布の強度を高めるとともに、脱落したり、毛羽立ったりしないようにするのが好ましい。 The nonwoven fabric of the present invention contains stretched and extracted fibers produced by the production method as described above. Therefore, not only is filtration performance and electrical insulation performance excellent, but also strength is excellent. The nonwoven fabric of the present invention may be any nonwoven fabric, but a wet nonwoven fabric is preferable because it has excellent texture. In particular, the stretch-extracted fiber of the present invention can be a wet nonwoven fabric with excellent texture because it is difficult to press-bond even when cut and can be uniformly dispersed in a slurry. In addition, when the stretched and extracted fiber is composed of two or more types of resins having a difference in melting point, it is preferable to increase the strength of the nonwoven fabric by fusing and prevent it from falling off or fluffing.
本発明の不織布においては、延伸抽出繊維が存在していることによる性能、例えば、濾過性能、電気絶縁性能等に優れるように、５ｍａｓｓ％以上含まれているのが好ましく、１０ｍａｓｓ％以上含まれているのがより好ましく、２０ｍａｓｓ％以上含まれているのが更に好ましい。 In the nonwoven fabric of the present invention, it is preferably contained in an amount of 5 mass% or more so as to be excellent in performance due to the presence of stretched extracted fibers, for example, filtration performance, electrical insulation performance, and the like. More preferably, it is more preferably 20% by mass or more.
この延伸抽出繊維を構成する樹脂は不織布の使用用途によって異なり、特に限定するものではないが、例えば、濾過材や電池用セパレータとして使用する場合には、前述のようなポリオレフィン系樹脂から構成されているのが好ましい。また、延伸抽出繊維以外の繊維も不織布の使用用途によって異なり、特に限定するものではない。 The resin constituting the stretched and extracted fiber differs depending on the use of the nonwoven fabric and is not particularly limited. For example, when used as a filter material or a battery separator, the resin is composed of the polyolefin resin as described above. It is preferable. Further, the fibers other than the stretch-extracted fibers are not particularly limited, and differ depending on the use of the nonwoven fabric.
本発明の不織布は常法により製造することができ、好適である湿式不織布は、例えば、次のようにして製造することができる。まず、上述のような延伸抽出繊維を製造する。次いで、この延伸抽出繊維（必要により他の繊維も）を常法の湿式法（例えば、水平長網方式、傾斜ワイヤー型長網方式、円網方式、又は長網・円網コンビネーション方式など）により繊維ウエブを形成する。そして、この繊維ウエブを、（１）水流などの流体流によって絡合したり、（２）延伸抽出繊維及び／又は混合した融着性を有する繊維を融着したり、（３）バインダーを塗布又は散布して接着して、湿式不織布を製造することができる。 The nonwoven fabric of this invention can be manufactured by a conventional method, and the suitable wet nonwoven fabric can be manufactured as follows, for example. First, the drawn and extracted fibers as described above are manufactured. Next, the drawn and extracted fibers (and other fibers as necessary) are obtained by a conventional wet method (for example, a horizontal long net method, an inclined wire type long net method, a circular net method, or a long net / circular net combination method). A fiber web is formed. And, this fiber web is (1) entangled by a fluid flow such as a water flow, (2) a stretched extracted fiber and / or a fiber having mixed fusing properties is fused, or (3) a binder is applied. Alternatively, the wet nonwoven fabric can be produced by spraying and bonding.
本発明の不織布は濾過性能や電気絶縁性能等に優れ、強度も優れているため、気体又は液体の濾過材や電池用セパレータとして使用できるばかりでなく、延伸抽出繊維が均一に分散した地合いの優れるものであることができるため、これら用途以外に、各種クリーニングシートとしても使用することができる。なお、本発明の不織布が各種用途に適合するように、エレクトレット化処理、親水化処理などを実施することができる。 Since the nonwoven fabric of the present invention is excellent in filtration performance, electrical insulation performance, etc., and has excellent strength, it can be used not only as a gas or liquid filtration material or battery separator, but also has an excellent texture in which stretched extracted fibers are uniformly dispersed. In addition to these applications, it can be used as various cleaning sheets. In addition, an electret process, a hydrophilization process, etc. can be implemented so that the nonwoven fabric of this invention may suit various uses.
以下に、本発明の実施例を記載するが、以下の実施例に限定されるものではない。 Examples of the present invention will be described below, but the present invention is not limited to the following examples.
（実施例１）
海島型複合繊維を紡糸できる常法の複合紡糸装置（２５島の海島型複合繊維を紡糸可能）を使用し、海成分（第１の樹脂成分）としてポリ−Ｌ−乳酸を、島成分（第２の樹脂成分）としてポリプロピレンを、ギアポンプ比７５：２５、温度２４０℃の条件下で押し出し、繊度４．６ｄｔｅｘの海島型未延伸複合繊維を紡糸した。
Example 1
Using a conventional compound spinning device capable of spinning sea-island composite fibers (which can spin 25 sea-island composite fibers), poly-L-lactic acid is used as the sea component (first resin component). Polypropylene was extruded as a resin component 2) under the conditions of a gear pump ratio of 75:25 and a temperature of 240 ° C., and a sea-island type unstretched composite fiber having a fineness of 4.6 dtex was spun.
次いで、この海島型未延伸複合繊維をチーズ染色機を用いて、糸巻き状のまま温度７０℃、１Ｍ−水酸化ナトリウム水溶液中に浸漬し、６０分間水酸化ナトリウム水溶液を循環させることにより、海成分（第１の樹脂成分）であるポリ−Ｌ−乳酸を除去して、繊維径が４μｍの未延伸ポリプロピレン抽出繊維束を得た。 Next, this sea-island type unstretched composite fiber was immersed in a 1M sodium hydroxide aqueous solution at a temperature of 70 ° C. in a pincushion shape using a cheese dyeing machine, and the aqueous sodium hydroxide solution was circulated for 60 minutes to obtain sea components. The poly-L-lactic acid (first resin component) was removed to obtain an unstretched polypropylene extracted fiber bundle having a fiber diameter of 4 μm.
次いで、この未延伸ポリプロピレン抽出繊維束を、絶対圧が４．２ｋｇ／ｃｍ２の加圧飽和水蒸気（温度１２０℃）を充填した容器内へ導入し、延伸倍率６倍で延伸して、ポリプロピレン延伸抽出繊維（繊維径：１．８μｍ、横断面形状：円形）を製造した。このポリプロピレン延伸抽出繊維は引張り強さが４．５ｃＮ／ｄｔｅｘの強度の優れるものであった。また、このポリプロピレン延伸抽出繊維に油剤を付与した後に、ギロチンカッターで３ｍｍ長に切断したところ、延伸抽出繊維同士が圧着することなく切断することができた。 Next, this unstretched polypropylene-extracted fiber bundle was introduced into a container filled with pressurized saturated water vapor (temperature 120 ° C.) having an absolute pressure of 4.2 kg / cm 2 , and stretched at a stretch ratio of 6 times to stretch polypropylene. Extracted fibers (fiber diameter: 1.8 μm, cross-sectional shape: circular) were produced. This polypropylene drawn and extracted fiber had excellent tensile strength of 4.5 cN / dtex. Further, after applying an oil agent to this polypropylene stretched-extracted fiber, it was cut into 3 mm lengths with a guillotine cutter, and the stretched-extracted fibers could be cut without pressure bonding.
（実施例２）
島成分として、ポリプロピレンを芯（５５ｍａｓｓ％）とし、ポリエチレンを鞘（４５ｍａｓｓ％）に複合した状態で供給したこと以外は実施例１と同様にして、繊維径が４μｍの未延伸ポリプロピレン−ポリエチレン抽出繊維束を得た。
(Example 2)
The unstretched polypropylene-polyethylene extracted fiber having a fiber diameter of 4 μm was used in the same manner as in Example 1 except that polypropylene was used as the core component (55 mass%) and polyethylene was combined in the sheath (45 mass%). Got a bunch.
次いで、この未延伸ポリプロピレン−ポリエチレン抽出繊維束を、絶対圧が４．２ｋｇ／ｃｍ2の加圧飽和水蒸気（温度：１０５℃）を充填した容器内へ導入し、延伸倍率５倍で延伸して、ポリプロピレン−ポリエチレン芯鞘型延伸抽出繊維（繊維径：２μｍ、横断面形状：円形）を得た。このポリプロピレン−ポリエチレン芯鞘型延伸抽出繊維は引張り強さが３．５ｃＮ／ｄｔｅｘの強度の優れるものであった。また、このポリプロピレン−ポリエチレン芯鞘型延伸抽出繊維に油剤を付与した後に、ギロチンカッターで３ｍｍ長に切断したところ、芯鞘型延伸抽出繊維同士が圧着することなく切断することができた。 Next, this unstretched polypropylene-polyethylene extracted fiber bundle was introduced into a container filled with pressurized saturated water vapor (temperature: 105 ° C.) having an absolute pressure of 4.2 kg / cm 2 and stretched at a stretch ratio of 5 times. Polypropylene-polyethylene core-sheath type stretch-extracted fibers (fiber diameter: 2 μm, cross-sectional shape: circular) were obtained. This polypropylene-polyethylene core-sheath stretch-extracted fiber had excellent tensile strength of 3.5 cN / dtex. Moreover, when an oil agent was applied to the polypropylene-polyethylene core-sheath stretch-extracted fiber and then cut into a length of 3 mm with a guillotine cutter, the core-sheath stretch-extracted fiber could be cut without being crimped.
（実施例３）
海成分としてポリエチレンテレフタレートを使用したこと、及び紡糸温度（押し出し温度）を３００℃としたこと以外は実施例１と同様にして、海島型未延伸複合繊維の紡糸、ポリエチレンテレフタレートの除去、及び未延伸ポリプロピレン抽出繊維束の延伸を実施して、ポリプロピレン延伸抽出繊維（繊維径：１．８μｍ、横断面形状：円形）を得た。このポリプロピレン延伸抽出繊維は引張り強さが３．８ｃＮ／ｄｔｅｘの強度の優れるものであった。また、このポリプロピレン延伸抽出繊維に油剤を付与した後に、ギロチンカッターで３ｍｍ長に切断したところ、延伸抽出繊維同士が圧着することなく切断することができた。
(Example 3)
Spinning of the sea-island unstretched composite fiber, removal of polyethylene terephthalate, and unstretched in the same manner as in Example 1 except that polyethylene terephthalate was used as the sea component and the spinning temperature (extrusion temperature) was 300 ° C. The polypropylene extracted fiber bundle was stretched to obtain polypropylene stretched extracted fibers (fiber diameter: 1.8 μm, cross-sectional shape: circular). This polypropylene drawn and extracted fiber had excellent tensile strength of 3.8 cN / dtex. Further, after applying an oil agent to this polypropylene stretched-extracted fiber, it was cut into 3 mm lengths with a guillotine cutter, and the stretched-extracted fibers could be cut without pressure bonding.
（比較例１）
海島型複合繊維を紡糸できる常法の複合紡糸装置（２５島の海島型複合繊維を紡糸可能）を使用し、海成分（第１の樹脂成分）としてポリエチレンテレフタレートを、島成分（第２の樹脂成分）としてポリプロピレンを、ギアポンプ比７５：２５、温度３００℃の条件下で押し出し、繊度４．６ｄｔｅｘの海島型未延伸複合繊維を紡糸した。
(Comparative Example 1)
Using a conventional compound spinning device capable of spinning sea-island type composite fibers (which can spin 25 sea-island type composite fibers), polyethylene terephthalate as sea component (first resin component), and island component (second resin) Polypropylene was extruded as a component) under the conditions of a gear pump ratio of 75:25 and a temperature of 300 ° C., and a sea-island type unstretched composite fiber having a fineness of 4.6 dtex was spun.
次いで、この海島型未延伸複合繊維を、温度９０℃の熱水浴へ供給し、延伸倍率４倍で延伸して、海島型延伸複合繊維を得た。 Next, this sea-island type unstretched composite fiber was supplied to a hot water bath at a temperature of 90 ° C. and stretched at a stretch ratio of 4 times to obtain a sea-island type stretched composite fiber.
次いで、この海島型延伸複合繊維をチーズ染色機を用いて、糸巻き状のまま温度９８℃、１Ｍ−水酸化ナトリウム水溶液中に浸漬し、６０分間水酸化ナトリウム水溶液を循環させることにより、海成分であるポリエチレンテレフタレートを除去して、ポリプロピレン延伸繊維（繊維径：２μｍ、横断面形状：円形）を得た。このポリプロピレン延伸繊維は引張り強さが２．５ｃＮ／ｄｔｅｘの強度の劣るものであった。また、このポリプロピレン延伸繊維に油剤を付与した後に、ギロチンカッターで３ｍｍ長に切断したところ、一部延伸繊維同士が圧着していた。
Next, this sea-island-type stretched composite fiber was immersed in a 1M sodium hydroxide aqueous solution at a temperature of 98 ° C. in a pincushion shape using a cheese dyeing machine, and the sodium hydroxide aqueous solution was circulated for 60 minutes. A certain polyethylene terephthalate was removed to obtain a drawn polypropylene fiber (fiber diameter: 2 μm, cross-sectional shape: circular). This polypropylene drawn fiber had an inferior tensile strength of 2.5 cN / dtex. In addition, after applying an oil agent to this polypropylene drawn fiber, it was cut into a length of 3 mm with a guillotine cutter.
Claims (7)
前記未延伸複合繊維を前記溶液で処理し、前記第１の樹脂成分を除去して、第２の樹脂成分からなる未延伸抽出繊維束を形成する抽出工程、
前記未延伸抽出繊維束を延伸して延伸抽出繊維を形成する延伸工程、
とを備えていることを特徴とする、延伸抽出繊維の製造方法。 A spinning step of spinning an unstretched conjugate fiber containing a first resin component removable by a predetermined solution and a second resin component difficult to remove by the solution;
An extraction step of treating the unstretched conjugate fiber with the solution to remove the first resin component to form an unstretched extracted fiber bundle composed of a second resin component;
A stretching step of stretching the unstretched extracted fiber bundle to form a stretched extracted fiber,
A method for producing a drawn and extracted fiber, comprising:
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