JP2020045599A - Undrawn electroconductive composite fiber and method of manufacturing bcf using the same - Google Patents

Undrawn electroconductive composite fiber and method of manufacturing bcf using the same Download PDF

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JP2020045599A
JP2020045599A JP2018176659A JP2018176659A JP2020045599A JP 2020045599 A JP2020045599 A JP 2020045599A JP 2018176659 A JP2018176659 A JP 2018176659A JP 2018176659 A JP2018176659 A JP 2018176659A JP 2020045599 A JP2020045599 A JP 2020045599A
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conductive
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bcf
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JP7048468B2 (en
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健吾 森江
Kengo Morie
健吾 森江
寿一 勝井
Juichi Katsui
寿一 勝井
斉藤 雅春
Masaharu Saito
雅春 斉藤
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KB Seiren Ltd
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Abstract

To provide an electroconductive fiber having sufficient electrical conductivity even when blended or drawn during manufacture of BCF and no noticeable black streak when used for a carpet.SOLUTION: An undrawn electroconductive composite fiber includes an electroconductive layer consisting of a polyamide containing an electroconductive carbon black of 20 mass% or more and 45 mass% or less, and a protective layer consisting of a polyamide containing a concealing inorganic pigment of 5% or more. A fracture elongation is 200% and 600%, a linear resistance value is 1.0E+05 to 9.9E+07 Ω/cm, and a ratio of an exposed circumference length of the electroconductive layer to a total circumference length of a cross-section of a fiber is less than 8%.SELECTED DRAWING: None

Description

本発明は、延伸後にも優れた導電性を示す未延伸ポリアミド系導電性複合繊維およびそれを用いたBCFの製造方法に関するものである。   The present invention relates to an undrawn polyamide-based conductive conjugate fiber exhibiting excellent conductivity even after drawing, and a method for producing a BCF using the same.

嵩高連続長繊維(BCF:Bulked Continuous Filament)はポリアミド、ポリプロピレン、ポリエステル、ポリ乳酸などの樹脂を紡糸延伸捲縮加工した繊維であり、自動車、家屋、車両、航空機などのカーペットに用いられる。このカーペットには実用的な強度、耐光性、耐へたり性、意匠性、制電性が求められる。カーペットなどの布帛に制電性を与える方法として、帯電防止剤を含む繊維を使用したり、布帛自体に帯電防止加工を施すことがある。しかし帯電防止剤や帯電防止加工は外気の水分によりその効果を発揮するものであり、乾燥した環境であれば、そのカーペットの制電性は損なわれ、不快な静電気を発生することとなる。そこでいかなる環境下でも高い制電性を得る方法として、導電性繊維をカーペットの中に混ぜ込むことがある(特許文献1)。   Bulk continuous filament (BCF) is a fiber obtained by spin-drawing and crimping a resin such as polyamide, polypropylene, polyester, or polylactic acid, and is used for carpets of automobiles, houses, vehicles, aircrafts, and the like. This carpet is required to have practical strength, light resistance, sag resistance, design properties, and antistatic properties. As a method for imparting antistatic properties to a cloth such as a carpet, there is a method of using a fiber containing an antistatic agent, or performing an antistatic treatment on the cloth itself. However, the antistatic agent or the antistatic treatment exerts its effect by the moisture of the outside air, and in a dry environment, the antistatic property of the carpet is impaired and unpleasant static electricity is generated. Therefore, as a method of obtaining high antistatic properties under any environment, a conductive fiber may be mixed into a carpet (Patent Document 1).

特開平7−258920号公報JP-A-7-258920

導電性繊維をカーペットの中に混ぜ込むと方法として、BCF製造時にカーボンブラックを含有する導電性繊維を混繊させる方法がある。BCFの製造は通常、樹脂を溶融して多数の孔を持つノズルから押し出し、複数のローラーを通過させて連続的に延伸、更にエアジェットで嵩高加工を施し、巻取機で巻き取ることで製造される。この工程において、ノズルから押し出され、延伸される前の糸条にボビン等に巻かれた導電糸を繰り出し、ガイドなどを介し混繊させる。ここで、混繊された導電糸は延伸に対し破断しないのはもちろんのこと延伸、嵩高加工後も一定以上の導電性を有していなければならない。また、この導電糸はカーペットに混ぜ込まれた際にカーボンブラック特有の黒筋が目立ってしまっては、カーペットの意匠性が著しく損なわれてしまう。
本発明は、BCF製造時に混繊、延伸されても十分な導電性を有しており、カーペットに使用された際に黒筋が目立たない導電糸を提供することをその目的とする。
As a method of mixing conductive fibers into a carpet, there is a method of mixing conductive fibers containing carbon black during BCF production. BCF is usually manufactured by melting the resin, extruding it from a nozzle with many holes, continuously stretching it through multiple rollers, applying bulky processing with an air jet, and winding it up with a winder. Is done. In this step, a conductive yarn wound around a bobbin or the like is fed to a yarn that has been extruded from a nozzle and has not been drawn, and is mixed through a guide or the like. Here, the blended conductive yarn must have not less than a certain degree of conductivity after drawing and bulking as well as being not broken by drawing. In addition, when the conductive yarn is mixed with a carpet and a black streak unique to carbon black becomes noticeable, the design of the carpet is significantly impaired.
An object of the present invention is to provide a conductive yarn which has sufficient conductivity even when it is mixed and stretched at the time of BCF production, and black streaks are not conspicuous when used for a carpet.

すなわち、本発明は、導電性カーボンブラックを20質量%以上、45質量%以下含有するポリアミドからなる導電層と、隠ぺい性無機顔料を5質量%以上含有するポリアミドからなる保護層とを有し、破断伸度が200〜600%であり、線抵抗値が1.0E+05〜9.9E+07Ω/cmであり、全周長に対する導電層の露出周長の割合は8%未満である、未延伸導電性複合繊維をその要旨とする。
上記未延伸導電性複合繊維は、BCFを製造する際の延伸工程への供給するものであることが好ましい。
上記未延伸導電性複合繊維は、繊維横断面における保護層の外周に3個以上の凸部を有するものであることが好ましい。
本発明は、また、非導電性繊維と導電性繊維と混繊してBCFを製造する方法であって、非導電性繊維を溶融紡糸する第1工程、溶融紡糸して得られた未延伸非導電性繊維と、上記未延伸導電性繊維を混繊して延伸する第2工程、混繊した延伸糸を流体噴射により嵩高加工する第3工程、得られた嵩高加工糸を巻き取る第4工程とを含むBCFの製造方法でもある。
That is, the present invention has a conductive layer made of a polyamide containing 20% by mass or more and 45% by mass or less of a conductive carbon black, and a protective layer made of a polyamide containing 5% by mass or more of an opaque inorganic pigment, The unstretched conductive material has a breaking elongation of 200 to 600%, a wire resistance of 1.0E + 05 to 9.9E + 07Ω / cm, and a ratio of an exposed circumference of the conductive layer to the entire circumference of less than 8%. The gist is conjugate fiber.
It is preferable that the unstretched conductive conjugate fiber is supplied to a stretching step in producing BCF.
It is preferable that the unstretched conductive conjugate fiber has three or more protrusions on the outer periphery of the protective layer in the fiber cross section.
The present invention also relates to a method for producing a BCF by blending a non-conductive fiber and a conductive fiber, wherein the first step of melt-spinning the non-conductive fiber, A second step of blending and drawing the conductive fiber and the undrawn conductive fiber, a third step of bulking the blended drawn yarn by fluid injection, and a fourth step of winding the obtained bulky processed yarn And a method for producing a BCF including the following.

本発明によれば、BCF製造時に混繊、延伸されても十分な導電性を有しており、カーペットに使用された際に黒筋が目立たない導電糸を提供できる。   ADVANTAGE OF THE INVENTION According to this invention, it has sufficient electroconductivity even if it is mixed and stretched at the time of BCF manufacture, and it can provide the electroconductive thread with which black streaks are not conspicuous when used for a carpet.

本発明におけるBCFの製造方法の例を示す説明図である。It is explanatory drawing which shows the example of the manufacturing method of BCF in this invention.

以下、本発明を詳細に説明する。
本発明は、導電層と、保護層とからなる未延伸導電性複合繊維である。
Hereinafter, the present invention will be described in detail.
The present invention is an undrawn conductive conjugate fiber comprising a conductive layer and a protective layer.

本発明において、導電層を構成するベースポリマーとなる熱可塑性樹脂は、ポリアミドである。
これらポリアミドとしては、例えば、ポリアミド6、ポリアミド66、ポリアミド12、ポリアミド11、ポリアミド610、ポリアミド612及びそれらを主体とする共重合体が挙げられ、中でも、ポリアミド6、ポリアミド66、ポリアミド12が好ましい。
In the present invention, the thermoplastic resin serving as the base polymer constituting the conductive layer is a polyamide.
Examples of these polyamides include polyamide 6, polyamide 66, polyamide 12, polyamide 11, polyamide 610, polyamide 612, and copolymers containing these as a main component. Of these, polyamide 6, polyamide 66, and polyamide 12 are preferable.

本発明の未延伸導電性複合繊維の導電層は、導電性カーボンブラックを20質量%以上、45質量%以下含有したポリアミドである。   The conductive layer of the unstretched conductive conjugate fiber of the present invention is a polyamide containing 20% by mass or more and 45% by mass or less of conductive carbon black.

本発明の導電性複合繊維において、導電層は、導電性カーボンブラックを20質量%以上、45質量%以下含有する。カーボンブラックの量が、少な過ぎると導電性及び制電性が得られず、多過ぎると、紡糸の際に、流動性が失われ製糸性が悪くなる傾向がある。中でも、カーボンブラックの含有量は、25質量%以上、40質量%以下が好ましい。   In the conductive composite fiber of the present invention, the conductive layer contains conductive carbon black in an amount of 20% by mass or more and 45% by mass or less. If the amount of carbon black is too small, conductivity and antistatic properties cannot be obtained, and if it is too large, fluidity tends to be lost at the time of spinning, resulting in poor spinning properties. Especially, the content of carbon black is preferably 25% by mass or more and 40% by mass or less.

本発明において、導電層に用いられる導電性カーボンブラックとしては、ケッチェンブラック、ファーネスブラック、アセチレンブラック、チャンネルブラックなどが挙げられ、優れた導電性を有するカーボンブラックであれば特に限定はされない。   In the present invention, examples of the conductive carbon black used in the conductive layer include Ketjen black, furnace black, acetylene black, and channel black, and are not particularly limited as long as the carbon black has excellent conductivity.

本発明において、保護層を構成する熱可塑性樹脂は、ポリアミドである。
保護層は、通常は、導電材料としてのカーボンブラックを含まない非導電層である。
本発明において保護層となるポリアミドとして、例えばポリアミド6、ポリアミド66、ポリアミド12、ポリアミド11、ポリアミド610、ポリアミド612などのポリアミド、及びこれらを共重合した物が挙げられるが、溶融紡糸可能なものであれば特に限定されるものではなく、好ましくはポリアミド6、ポリアミド66である。
In the present invention, the thermoplastic resin constituting the protective layer is a polyamide.
The protective layer is usually a non-conductive layer that does not contain carbon black as a conductive material.
Examples of the polyamide serving as the protective layer in the present invention include polyamides such as polyamide 6, polyamide 66, polyamide 12, polyamide 11, polyamide 610, and polyamide 612, and copolymers thereof. It is not particularly limited as long as it is present, and is preferably polyamide 6 or polyamide 66.

本発明の未延伸導電性複合繊維の保護層は、隠ぺい性無機顔料を含有する。この隠ぺい性無機顔料は導電部分のカーボンブラックの着色を隠ぺいする。   The protective layer of the undrawn conductive conjugate fiber of the present invention contains an opaque inorganic pigment. This opaque inorganic pigment conceals the coloring of carbon black in the conductive portion.

隠ぺい性無機顔料の含有量は、保護層のポリアミドに対し、5質量%以上であり、より好ましくは、7質量%以上である。隠ぺい性無機顔料の含有量が多過ぎると、導電性複合繊維の製造時の溶融紡糸ノズルの汚れが強くなり、歩留りが低下したり、得られる導電性複合繊維の物性の低下、紡糸装置のガイドなどが摩耗劣化するため、隠ぺい性無機顔料の含有量の上限は、15質量%程度が好ましい。
上記の範囲で、保護層に、隠ぺい性無機顔料を含有することにより、製糸性や糸物性の低下を招くことなくカーボンブラックの着色を効果的に隠ぺいし、カーボンブラック含有繊維特有の黒スジが目立たず、良好な意匠性を有するものとなる。
The content of the opaque inorganic pigment is at least 5% by mass, more preferably at least 7% by mass, based on the polyamide of the protective layer. If the content of the opaque inorganic pigment is too high, the contamination of the melt-spinning nozzle during the production of the conductive conjugate fiber becomes strong, and the yield decreases, the physical properties of the obtained conductive conjugate fiber decrease, and the guide of the spinning device. For example, the upper limit of the content of the opaque inorganic pigment is preferably about 15% by mass.
In the above range, the protective layer contains an opaque inorganic pigment, thereby effectively concealing the coloring of carbon black without lowering the spinning properties and yarn properties, and the black streak unique to the carbon black-containing fiber is reduced. It is inconspicuous and has good design properties.

このような隠ぺい性無機顔料としては、例えば、酸化チタン、硫酸バリウム、酸化カルシウム、酸化亜鉛などの増白剤が好適に挙げられ、特に酸化チタンが好ましい。   As such an opaque inorganic pigment, for example, a whitening agent such as titanium oxide, barium sulfate, calcium oxide, or zinc oxide is preferably mentioned, and titanium oxide is particularly preferable.

本発明における隠ぺい性無機顔料は、コスト、白度、繊維とした際の強伸度への影響や、繊維加工機械のガイドなどに対する摩耗性などを鑑みて適宜選択すればよい。   The opaque inorganic pigment in the present invention may be appropriately selected in consideration of the cost, the whiteness, the effect on the strength and elongation of the fiber, the abrasion on a guide of a fiber processing machine, and the like.

また、これらの隠ぺい性無機顔料を保護層に含有させる方法は、特に限定するものではないが、あらかじめポリアミドに混練し、コンパウンドとして溶融紡糸しても良いし、樹脂混練物を一度ペレット化することなく混練と溶融紡糸を連続的に行っても良い。また隠ぺい性無機顔料を30質量%以上含有する高濃度マスターバッチをあらかじめ作製し、溶融紡糸時にドライブレンドにて希釈し、濃度を調整しても良い。   The method for incorporating these opaque inorganic pigments into the protective layer is not particularly limited, but may be kneaded with polyamide in advance, melt-spun as a compound, or pelletized the resin kneaded material once. Alternatively, kneading and melt spinning may be performed continuously. Alternatively, a high-concentration masterbatch containing 30% by mass or more of the opaque inorganic pigment may be prepared in advance, and diluted by dry blending during melt spinning to adjust the concentration.

本発明の未延伸導電性複合繊維の破断伸度は、200〜600%である。破断伸度が200%未満であると、BCF製造時に混繊され、延伸、嵩高加工された際に糸切れや導電性の低下(線抵抗値の著しい上昇)が生じる。また、破断伸度が600%を超えると、理由は定かではないが、BCFとした際に、導電性複合繊維のみがBCFからたるみ、浮き上がったような形態となり、カーペットとする際の製織性、意匠性や導電性の耐久性に悪影響を及ぼす。中でも、250〜550%が好ましい。   The elongation at break of the undrawn conductive conjugate fiber of the present invention is 200 to 600%. If the elongation at break is less than 200%, the fibers are mixed during the production of the BCF, and the yarn is broken or the conductivity is lowered (a remarkable increase in the line resistance value) occurs when the fiber is stretched and bulked. Further, when the elongation at break exceeds 600%, although the reason is not clear, when formed into a BCF, only the conductive conjugate fiber sags and floats from the BCF, resulting in a weaving property when forming a carpet. It has a bad influence on the design and the durability of conductivity. Especially, 250 to 550% is preferable.

本発明の未延伸導電性複合繊維の破断強度は、0.4cN/dtex以上が好ましく、より好ましくは0.6cN/dtex以上である。上限は特にないが、未延伸糸であることと、破断伸度とのバランスを考慮すると上限は2.5cN/dtex程度であることが好ましい。この範囲であると、製糸及びBCF製造時の混繊、延伸、嵩高加工の安定性が得られるため、好ましい。   The breaking strength of the undrawn conductive conjugate fiber of the present invention is preferably 0.4 cN / dtex or more, and more preferably 0.6 cN / dtex or more. Although there is no particular upper limit, the upper limit is preferably about 2.5 cN / dtex in consideration of the balance between undrawn yarn and elongation at break. Within this range, the stability of blending, drawing, and bulking during yarn production and BCF production can be obtained, which is preferable.

本発明の未延伸導電性複合繊維の総繊度は、15〜80dtexが好ましく、より好ましくは20〜60dtexである。この範囲であると、十分な白度、カーペットとした際の意匠性、導電性、製糸及びBCF製造時の混繊、延伸、嵩高加工の安定性が得られるため、好ましい。   The total fineness of the undrawn conductive conjugate fiber of the present invention is preferably from 15 to 80 dtex, and more preferably from 20 to 60 dtex. This range is preferable because sufficient whiteness, design properties as a carpet, conductivity, and stability of fiber mixing, stretching, and bulking during yarn production and BCF production are obtained.

本発明の未延伸導電性複合繊維のフィラメント数は、特に限定されるのもではないが、1〜8fが好ましく、より好ましくは1〜6fであり、白度や単糸の破断強度を鑑み決定する。   The number of filaments of the undrawn conductive conjugate fiber of the present invention is not particularly limited, but is preferably 1 to 8f, more preferably 1 to 6f, and is determined in view of whiteness and breaking strength of a single yarn. I do.

本発明の未延伸導電性複合繊維の線抵抗値は、1.0E+05〜9.9E+07Ω/cmである。この範囲であると、製糸及びBCF製造時の混繊、延伸、嵩高加工の安定性およびBCFとした際にも十分な導電性が得られ、しいてはカーペットとした際に良好な制電性を示す。
本発明の未延伸導電性複合繊維のパッケージ(巻き姿)は、ボビンやパーンに巻き取られたものであり、そのパッケージ端面はテーパー角が90°のスクエアエンドでも、テーパー角が90°未満のテーパーエンドでも良い。また、ある一定の内層のボビン直径まではスクエアエンドで、その位置から外層はテーパーエンドとなるパッケージでも良く、それらは取扱い性や運搬、運送の効率や容易性、BCFへの混繊する際にパッケージから導電性複合繊維を繰り出す安定性を鑑みて決定すればよい。
The line resistance value of the undrawn conductive conjugate fiber of the present invention is 1.0E + 05 to 9.9E + 07Ω / cm. When the content is within this range, the stability of fiber mixing, stretching, and bulking during yarn production and BCF production and sufficient conductivity when obtained as a BCF can be obtained, and good antistatic properties can be obtained when used as a carpet. Is shown.
The package (wound form) of the undrawn conductive conjugate fiber of the present invention is wound on a bobbin or a pirn, and the end face of the package has a taper angle of less than 90 ° even at a square end having a taper angle of 90 °. It may be a tapered end. In addition, a package having a square end up to a certain inner layer bobbin diameter, and an outer layer having a tapered end from that position may be used for handling, transporting, transport efficiency and easiness, and when blending into BCF. What is necessary is just to determine in consideration of the stability which draws out a conductive composite fiber from a package.

本発明において、繊維横断面は、繊維軸長手方向に垂直な面をいう。
本発明の未延伸導電性複合繊維は、導電層及び保護層が、繊維長手方向に連続していることが好ましい。
In the present invention, the fiber cross section refers to a plane perpendicular to the fiber axis longitudinal direction.
In the undrawn conductive conjugate fiber of the present invention, the conductive layer and the protective layer are preferably continuous in the fiber longitudinal direction.

本発明の導電性複合繊維の繊維横断面における、保護層/導電層の面積比率は好ましくは100/1〜3/1、より好ましくは50/1〜5/1である。保護層の面積比率が高すぎると、白度が高くなるが、十分な導電性が得られないおそれがある。また、保護層の面積比率が低すぎると、十分な白度が得られなくなるどころか、破断強度及び破断伸度が低下し、BCF混繊時における延伸工程にて糸切れが多発するおそれがある。
本発明の導電性複合繊維の繊維横断面の断面形状は、導電層が保護層に完全に包まれている非露出タイプ、導電層が繊維表面の一部または繊維表面全体に露出している露出タイプのいずれでもよい。しかしながら、繊維とした際に十分な白度を有するためには、繊維横断面における繊維表面への導電層の露出長は短いほど好ましく、導電性複合繊維の繊維横断面における全周長に対する導電層の露出周長の割合は8%未満が好ましく、より好ましくは0%、すなわち導電層が非露出である。
また、繊維横断面としては丸断面、三角断面、多葉断面など、特に限定されるものではないが、乱反射により繊維の白度を上げるために多葉断面であることが好ましい。
特に好ましい断面形状として、繊維横断面における保護層の外周に3個以上の凸部を有するものが挙げられる。これにより、光が乱反射し易く、優れた白度を得られやすい。
The area ratio of the protective layer / conductive layer in the fiber cross section of the conductive conjugate fiber of the present invention is preferably 100/1 to 3/1, more preferably 50/1 to 5/1. If the area ratio of the protective layer is too high, the whiteness will increase, but sufficient conductivity may not be obtained. On the other hand, if the area ratio of the protective layer is too low, the breaking strength and the breaking elongation are lowered, instead of obtaining sufficient whiteness, and yarn breakage may frequently occur in the drawing step at the time of BCF blending.
The cross-sectional shape of the conductive conjugate fiber of the present invention is a non-exposed type in which the conductive layer is completely wrapped in the protective layer, and an exposed type in which the conductive layer is exposed on a part of the fiber surface or the entire fiber surface. Any of the types may be used. However, in order to have sufficient whiteness when used as a fiber, the shorter the exposed length of the conductive layer on the fiber surface in the fiber cross section, the more preferable it is. Is preferably less than 8%, more preferably 0%, that is, the conductive layer is not exposed.
The cross section of the fiber is not particularly limited, such as a round cross section, a triangular cross section, and a multi-leaf cross section, but is preferably a multi-leaf cross section to increase the whiteness of the fiber due to diffuse reflection.
A particularly preferred cross-sectional shape is one having three or more convex portions on the outer periphery of the protective layer in the fiber cross section. As a result, light is likely to be irregularly reflected, and excellent whiteness is easily obtained.

本発明の未延伸導電性複合繊維を後述する方法で測定したL*値は、65以上であることが好ましく、より好ましくは70以上である。この範囲であると、カーペットとした際に導電性繊維の黒筋が目立たない。   The L * value of the unstretched conductive conjugate fiber of the present invention measured by the method described below is preferably 65 or more, more preferably 70 or more. Within this range, the black streaks of the conductive fibers are not noticeable when used as a carpet.

このような本発明の未延伸導電性複合繊維は、BCFを製造する際に、ノズルから吐出される糸条に混繊し、延伸、嵩高加工に対し、破断せず、導電性を維持することができ、BCFカーペットとした際に、黒筋が目立つことなく良好な制電性を得ることができる。   Such an unstretched conductive conjugate fiber of the present invention, when producing a BCF, is mixed with a yarn discharged from a nozzle, does not break during stretching and bulking, and maintains conductivity. When a BCF carpet is obtained, good antistatic properties can be obtained without noticeable black streaks.

本発明の未延伸導電性複合繊維の好適な製造方法の例を示す。
上記の導電性カーボンブラック、上記のポリアミドを準備し、混練して樹脂組成物を製造する。得られた樹脂組成物を導電層、隠ぺい材を5質量%以上含有するポリアミドを保護層とし、導電層と保護層が繊維横断面で複合された状態で吐出される複合口金と用いて、溶融複合紡糸を行い、導電性複合繊維を製造する。
溶融紡糸の際、紡糸温度は、原料となるポリアミドの融点+10℃〜80℃、紡糸速度は、400〜1800m/min程度が好ましく、この範囲であると製糸性が安定し、巻き取ったパッケージの形状も良好である。また、ポリアミドは合成繊維の中でも吸水性、吸湿性が高く、特に未延伸であるとその特性は顕著となるため、付与させる油剤や巻取環境温湿度を適宜調整する。
図1はBCFの製造方法の例を示す。溶融紡糸装置1から吐出された非導電性未延伸繊維と、本発明の未延伸導電性複合繊維2をガイド3を介して引き揃えて混繊し、油剤付与ローラー4で油剤付与し、第1ゴデッドローラー5に供給し、第1ゴデッドローラー5と第2ゴデッドローラー6の間で、延伸する。次いで、得られた延伸糸を嵩高加工装置7で流体噴射にて嵩高加工を行い、ワインダー8に巻取り、BCF9を得ることができる。また、糸走行やその方向、巻取張力を安定させたり、多段延伸もしくは弛緩させる目的で第2ゴデットローラー6のあとにもローラーを適宜設置しても良い。
未延伸非導電繊維と、未延伸導電性複合繊維の混合比率は、BCFとなった際の質量比率で、BCFに対し0.2〜5質量%程度未延伸導電性複合繊維を混合することが好ましい。
第1ゴデッドローラー5と第2ゴデッドローラー6との延伸条件の好適な例を挙げると、例えば、第1ゴデッドローラー5の温度は室温でもよいが、延伸の安定性や導電性複合繊維の導電性を維持するためには40℃以上、第2ゴデッドローラー6の温度は第1ゴデッドローラーの温度よりも高く、好ましくは110℃以上、より好ましくは130℃以上である。延伸倍率は2.0倍から4.5倍で、BCFの強伸度や捲縮特性を鑑み決定する。
また、嵩高加工方法は、特に限定されるものではないが、例えば、流体噴射加工(エアジェット)が好適に挙げられる。
このようにして得られたBCFを用いて、公知の諸加工工程を経てタフティングを行い、精練して、染色し、制電性が優れ、黒筋が、目立たない意匠性の良好なカーペットを得ることができる。
The example of the suitable manufacturing method of the undrawn electroconductive composite fiber of this invention is shown.
The above conductive carbon black and the above polyamide are prepared and kneaded to produce a resin composition. The obtained resin composition was used as a conductive layer, and a polyamide containing 5% by mass or more of a concealing material was used as a protective layer, and the conductive layer and the protective layer were melted using a composite die discharged in a state of being composited in a cross section of the fiber. Composite spinning is performed to produce a conductive composite fiber.
At the time of melt spinning, the spinning temperature is preferably the melting point of the raw material polyamide + 10 ° C. to 80 ° C., and the spinning speed is preferably about 400 to 1800 m / min. The shape is also good. In addition, polyamide has high water absorption and hygroscopicity among synthetic fibers, and its properties become remarkable especially when undrawn. Therefore, the oil agent to be applied and the temperature and humidity of the winding environment are appropriately adjusted.
FIG. 1 shows an example of a method for manufacturing BCF. The non-conductive unstretched fiber discharged from the melt spinning device 1 and the unstretched conductive conjugate fiber 2 of the present invention are aligned and mixed via a guide 3 and mixed, and an oil agent is applied by an oil agent applying roller 4. It is supplied to the goded roller 5 and stretched between the first goded roller 5 and the second goded roller 6. Next, the obtained drawn yarn is subjected to bulk processing by fluid injection in a bulk processing device 7 and wound around a winder 8 to obtain a BCF 9. Further, a roller may be appropriately provided after the second godet roller 6 for the purpose of stabilizing the yarn running, its direction, the winding tension, or performing multi-stage stretching or relaxation.
The mixing ratio of the unstretched non-conductive fiber and the unstretched conductive conjugate fiber is a mass ratio when it becomes BCF, and the unstretched conductive conjugate fiber may be mixed at about 0.2 to 5% by mass with respect to the BCF. preferable.
Preferable examples of the drawing conditions of the first goded roller 5 and the second goded roller 6 include, for example, the temperature of the first goded roller 5 may be room temperature, but the drawing stability and the conductive conjugate fiber The temperature of the second goded roller 6 is higher than the temperature of the first goded roller, preferably 110 ° C. or higher, more preferably 130 ° C. or higher. The stretching ratio is from 2.0 times to 4.5 times, and is determined in view of the strong elongation and crimping properties of BCF.
In addition, the bulky processing method is not particularly limited, and for example, a fluid jetting process (air jet) is preferably used.
Using the BCF thus obtained, tufting is performed through various known processing steps, scouring and dyeing are performed. Obtainable.

以下に実施例を挙げて本発明を具体的に説明する。なお、本発明は以下に述べる実施例に限定されるものではない。尚、本発明の実施例及び比較例で得られた導電性繊維及びそれからなる生地の特性・評価は次に示す方法より求めた。   Hereinafter, the present invention will be described specifically with reference to examples. The present invention is not limited to the embodiments described below. In addition, the characteristics and evaluation of the conductive fibers obtained in Examples and Comparative Examples of the present invention and the fabrics made thereof were determined by the following methods.

<破断強度、破断伸度>
導電性複合繊維の破断強度及び破断伸度は、JIS L 1013に準じ、(株)島津製作所製AGS−1KNGオートグラフ引っ張り試験機を用い、試料糸長5cm、引っ張り速度10cm/minの条件で試料が伸長破断したときの強度及び伸度を測定して求めた。
<繊維の導電性評価(線抵抗値)>
線抵抗値は、導電性複合繊維を10cm採取し、その両端に導電性接着剤でアルミ箔を接着させ、Agilent社製ハイレジスタンスメーター4339Bを用いて10cm長での抵抗値を測定した。測定値を10cmで割り返し、線抵抗値(Ω/cm)とした。
<ニュアンス巻による白度評価>
未延伸導電性繊維を黒板に、その黒板が透けないよう目付1.2g/cm以上で隙間なく、また、繊維を延伸することなく巻きつけ、日本電飾 測色色差計(ZE−2000)を用い、L値を測定した。L値が65以上となるとBCFとした際、しいてはカーペットとした際に導電性複合繊維の黒筋が目立たない。
<Breaking strength, breaking elongation>
The breaking strength and breaking elongation of the conductive conjugate fiber were measured according to JIS L 1013 using an AGS-1KNG autograph tensile tester manufactured by Shimadzu Corporation under the conditions of a sample yarn length of 5 cm and a pulling speed of 10 cm / min. Was measured by measuring the strength and elongation at the time of elongation breaking.
<Evaluation of fiber conductivity (wire resistance value)>
The wire resistance value was obtained by collecting a conductive composite fiber of 10 cm, bonding an aluminum foil to both ends thereof with a conductive adhesive, and measuring the resistance value at a length of 10 cm using a high resistance meter 4339B manufactured by Agilent. The measured value was divided by 10 cm to obtain a wire resistance value (Ω / cm).
<Evaluation of whiteness by nuance volume>
Unstretched conductive fiber is wrapped around a blackboard at a basis weight of 1.2 g / cm 2 or more so that the blackboard is not transparent, and the fiber is wound without stretching. Nippon Denshoku Colorimeter (ZE-2000) Was used to measure the L * value. When the L * value is 65 or more, the black streaks of the conductive conjugate fibers are not noticeable when used as a BCF, and subsequently when used as a carpet.

〔実施例1〕
ポリアミド6に導電性カーボンブラックを35質量%混練した樹脂組成物を芯の導電層、アナターゼ型酸化チタン9.7質量%を含有するポリアミド6を鞘の保護層とし、導電層が保護層に完全に包まれ、保護層は4つの突起(凸部)を有する十字型断面となる口金を用いて溶融複合紡糸機にて複合紡糸を行った。保護層と導電層の繊維横断面における面積比率は10:1となるようギアポンプを調節し、8ホールのノズルから吐出された複合繊維を8つに分け、油剤を付与し、35dtexのモノフィラメントとして680m/minで回転する8つのボビンに未延伸複合導電繊維を巻き取った。
[Example 1]
A resin composition obtained by kneading 35% by mass of conductive carbon black into polyamide 6 is used as a core conductive layer, and polyamide 6 containing 9.7% by mass of anatase type titanium oxide is used as a sheath protective layer. The protective layer was subjected to composite spinning by a melt composite spinning machine using a die having a cross-shaped cross section having four projections (projections). The gear pump was adjusted so that the area ratio of the protective layer and the conductive layer in the cross section of the fiber was 10: 1. The composite fiber discharged from the 8-hole nozzle was divided into eight, oil was applied, and 680 m as a 35 dtex monofilament. The undrawn composite conductive fiber was wound around eight bobbins rotating at / min.

〔実施例2〕
ポリアミド6に導電性カーボンブラックを35質量%混練した樹脂組成物を芯の導電層、アナターゼ型酸化チタン9.7質量%を含有するポリアミド6を鞘の保護層とし、導電層が保護層に完全に包まれ、保護層は4つの突起(凸部)を有する十字型断面となる口金を用いて溶融複合紡糸機にて複合紡糸を行った。保護層と導電層の繊維横断面における面積比率は30:1となるようギアポンプを調節し、8ホールのノズルから吐出された複合繊維を8つに分け、油剤を付与し、35dtexのモノフィラメントとして680m/minで回転する8つのボビンに未延伸複合導電繊維を巻き取った。
[Example 2]
A resin composition obtained by kneading 35% by mass of conductive carbon black into polyamide 6 is used as a core conductive layer, and polyamide 6 containing 9.7% by mass of anatase type titanium oxide is used as a sheath protective layer. The protective layer was subjected to composite spinning by a melt composite spinning machine using a die having a cross-shaped cross section having four projections (projections). The gear pump was adjusted so that the area ratio of the protective layer and the conductive layer in the cross section of the fiber was 30: 1. The composite fiber discharged from the 8-hole nozzle was divided into eight, oil was applied, and 680 m as a 35 dtex monofilament. The undrawn composite conductive fiber was wound around eight bobbins rotating at / min.

〔実施例3〕
ポリアミド6に導電性カーボンブラックを35質量%混練した樹脂組成物を芯の導電層、アナターゼ型酸化チタン9.7質量%を含有するポリアミド6を鞘の保護層とし、導電層が繊維表面に一部露出し、保護層は4つの突起(凸部)を有する十字型断面となる口金を用いて溶融複合紡糸機にて複合紡糸を行った。保護層と導電層の繊維横断面における面積比率は30:1となるようギアポンプを調節し、8ホールのノズルから吐出された複合繊維を8つに分け、油剤を付与し、35dtexのモノフィラメントとして680m/minで回転する8つのボビンに未延伸複合導電繊維を巻き取った。導電層は繊維横断面における1つの凹部に露出し、全周長に対する導電層の露出周長の割合は5%であった。
[Example 3]
A resin composition obtained by kneading 35% by mass of conductive carbon black into polyamide 6 is used as a core conductive layer, and polyamide 6 containing 9.7% by mass of anatase type titanium oxide is used as a sheath protective layer. The composite spinning was performed by a melt composite spinning machine using a die having a cross-shaped cross section having four projections (projections) as the protective layer. The gear pump was adjusted so that the area ratio of the protective layer and the conductive layer in the cross section of the fiber was 30: 1. The composite fiber discharged from the 8-hole nozzle was divided into eight, oil was applied, and 680 m as a 35 dtex monofilament. The undrawn composite conductive fiber was wound around eight bobbins rotating at / min. The conductive layer was exposed in one concave portion in the fiber cross section, and the ratio of the exposed circumference of the conductive layer to the entire circumference was 5%.

〔実施例4〕
ポリアミド6に導電性カーボンブラックを35質量%混練した樹脂組成物を芯の導電層、ルチル型酸化チタン50質量%を含有するポリアミド6とアナターゼ型酸化チタン0.3質量%を含有するポリアミドをドライブレンドし、保護層における酸化チタンの総含有量が6.2質量%となるようブレンド比を調整したものを保護層とし、導電層が保護層に完全に包まれ、保護層は4つの突起(凸部)を有する十字型断面となる口金を用いて溶融複合紡糸機にて複合紡糸を行った。保護層と導電層の繊維横断面における面積比率は30:1となるようギアポンプを調節し、8ホールのノズルから吐出された複合繊維を8つに分け、油剤を付与し、35dtexのモノフィラメントとして680m/minで回転する8つのボビンに未延伸複合導電繊維を巻き取った。
[Example 4]
A conductive layer serving as a core is a resin composition obtained by kneading 35% by mass of conductive carbon black with polyamide 6, and a polyamide 6 containing 50% by mass of rutile type titanium oxide and a polyamide containing 0.3% by mass of anatase type titanium oxide are dried. The protective layer is blended and the blending ratio is adjusted so that the total content of titanium oxide in the protective layer is 6.2% by mass. The protective layer is completely covered with the conductive layer, and the protective layer has four protrusions ( Composite spinning was performed with a melt composite spinning machine using a die having a cruciform cross section having a convex portion. The gear pump was adjusted so that the area ratio of the protective layer and the conductive layer in the cross section of the fiber was 30: 1. The composite fiber discharged from the 8-hole nozzle was divided into eight, oil was applied, and 680 m as a 35 dtex monofilament. The undrawn composite conductive fiber was wound around eight bobbins rotating at / min.

〔比較例1〕
ポリアミド6に導電性カーボンブラックを35質量%混練した樹脂組成物を芯の導電層、アナターゼ型酸化チタン9.7質量%を含有するポリアミド6を鞘の保護層とし、導電層が繊維表面に一部露出し、保護層は4つの突起を有する十字型断面となる口金を用いて溶融複合紡糸機にて複合紡糸を行った。保護層と導電層の繊維横断面における面積比率は30:1となるようギアポンプを調節し、8ホールのノズルから吐出された複合繊維を8つに分け、油剤を付与し、35dtexのモノフィラメントとして680m/minで回転する8つのボビンに未延伸複合導電繊維を巻き取った。導電層は繊維横断面における1つの凹部に露出し、全周長に対する導電層の露出周長の割合は16%であった。
[Comparative Example 1]
A resin composition obtained by kneading 35% by mass of conductive carbon black into polyamide 6 is used as a core conductive layer, and polyamide 6 containing 9.7% by mass of anatase type titanium oxide is used as a sheath protective layer. The composite spinning was carried out by a melt composite spinning machine using a spinneret having a cross-shaped cross-section having four projections and a protective layer having four projections. The gear pump was adjusted so that the area ratio of the protective layer and the conductive layer in the cross section of the fiber was 30: 1. The composite fiber discharged from the 8-hole nozzle was divided into eight, oil was applied, and 680 m as a 35 dtex monofilament. The undrawn composite conductive fiber was wound around eight bobbins rotating at / min. The conductive layer was exposed in one concave portion in the fiber cross section, and the ratio of the exposed circumference of the conductive layer to the entire circumference was 16%.

〔比較例2〕
ポリアミド6に導電性カーボンブラックを35質量%混練した樹脂組成物を芯の導電層、アナターゼ型酸化チタン1.6質量%を含有するポリアミド6を鞘の保護層とし、導電層が保護層に完全に包まれ、保護層は4つの突起を有する十字型断面となる口金を用いて溶融複合紡糸機にて複合紡糸を行った。保護層と導電層の繊維横断面における面積比率は30:1となるようギアポンプを調節し、8ホールのノズルから吐出された複合繊維を8つに分け、油剤を付与し、35dtexのモノフィラメントとして680m/minで回転する8つのボビンに未延伸複合導電繊維を巻き取った。
[Comparative Example 2]
A resin composition obtained by kneading 35% by mass of conductive carbon black into polyamide 6 is used as a core conductive layer, and polyamide 6 containing 1.6% by mass of anatase type titanium oxide is used as a sheath protective layer. And the protective layer was subjected to composite spinning with a melt composite spinning machine using a die having a cross-shaped cross section having four projections. The gear pump was adjusted so that the area ratio of the protective layer and the conductive layer in the cross section of the fiber was 30: 1. The composite fiber discharged from the 8-hole nozzle was divided into eight, oil was applied, and 680 m as a 35 dtex monofilament. The undrawn composite conductive fiber was wound around eight bobbins rotating at / min.

Figure 2020045599
Figure 2020045599

実施例1〜4、比較例1,2で得た未延伸導電性複合繊維パッケージをクリルにセットし、溶融紡糸装置から吐出される96フィラメントのポリアミド6の糸条に、クリルから繰り出した未延伸導電性複合繊維を、ガイドを介して混繊し、900m/minで回転する50℃の第1ゴデットローラー、2800m/minで回転する160℃の第2ゴデットローラー間で連続的に延伸し、さらに160℃のエアジェットにて嵩高加工を施したのち、ワインダーにて巻き取った。得られたBCFは1560dtex/97fで、延伸された導電性複合繊維が1フィラメント含まれている。この際、得られたすべての未延伸導電性複合繊維パッケージからの糸の繰り出し(解舒性)、延伸や加工は安定したものであった。また、これら導電性複合繊維が混繊されたBCFを2.54cm当たり2本用いて製造されたカーペットは人体帯電圧測定法によると人体帯電圧3.0kV(絶対値)以下となり、優れた制電性を示した。
実施例1〜4を用いて得たBCFは導電性に優れ、また導電性複合繊維が含まれていないBCFと比べ、筋が目立つものではなかった。比較例1,2を用いて得たBCFは導電性複合繊維が含まれていないBCFと比べ、黒もしくはグレーの筋が目立つものとなった。
<参考例1>
33dtex/3fの延伸導電性複合繊維(破断強度2.9cN/dtex,破断伸度65%、線抵抗値3.5E+07Ω/cm)のパッケージをクリルにセットし、溶融紡糸装置から吐出される96フィラメントのポリアミド6の糸条に、パッケージから繰り出した延伸導電性複合繊維を、ガイドを介して混繊し、900m/minで回転する50℃の第1ゴデットローラー、2800m/minで回転する160℃の第2ゴデットローラー間で連続的に延伸したが、ローラー間で導電性複合繊維の破断を繰り返し、BCFを安定的に得ることができなかった。
<参考例2>
溶融紡糸装置から吐出される96フィラメントのポリアミド6の糸条を900m/minで回転する50℃の第1ゴデットローラー、2800m/minで回転する160℃の第2ゴデットローラー間で連続的に延伸したのち、クリルにセットされた33dtex/3fの延伸導電性複合繊維(破断強度2.9cN/dtex,破断伸度65%、線抵抗値3.5E+07Ω/cm)パッケージから繰り出した延伸導電性複合繊維を混繊させ、160℃の流体噴射にて嵩高加工を施したのち、ワインダーにて巻き取った。パッケージからの繰り出しは安定せず、糸切れやパッケージの形状崩れを起こしたため、得られるBCFの歩留りが低下した。
The unstretched conductive composite fiber packages obtained in Examples 1 to 4 and Comparative Examples 1 and 2 were set on krill, and unstretched unreeled from krill on a 96-filament polyamide 6 yarn discharged from a melt spinning device. The conductive conjugate fiber is mixed through a guide and continuously stretched between a first godet roller at 50 ° C. rotating at 900 m / min and a second godet roller at 160 ° C. rotating at 2800 m / min. Then, after performing bulk processing with an air jet at 160 ° C., the film was wound up with a winder. The obtained BCF is 1560 dtex / 97f, and contains one stretched conductive conjugate fiber. At this time, the unreeling (unwinding property), stretching, and processing of the yarn from all the obtained undrawn conductive composite fiber packages were stable. In addition, according to the human body voltage measurement method, the carpet manufactured using two BCFs mixed with these conductive composite fibers per 2.54 cm has a human body voltage of 3.0 kV (absolute value) or less. Showed electrical conductivity.
The BCF obtained by using Examples 1 to 4 was excellent in conductivity, and the streaks were not conspicuous compared to BCF containing no conductive composite fiber. The BCF obtained using Comparative Examples 1 and 2 had black or gray streaks more conspicuous than the BCF containing no conductive conjugate fiber.
<Reference Example 1>
A package of 33dtex / 3f stretched conductive composite fiber (breaking strength: 2.9 cN / dtex, breaking elongation: 65%, wire resistance: 3.5E + 07Ω / cm) is set on a krill, and 96 filaments discharged from a melt spinning device A stretched conductive conjugate fiber drawn out of a package is mixed with a yarn of polyamide 6 through a guide, a first godet roller at 50 ° C. rotating at 900 m / min, and 160 ° C. rotating at 2800 m / min. However, the conductive conjugate fiber was repeatedly broken between the rollers, and BCF could not be stably obtained.
<Reference Example 2>
A 96-filament polyamide 6 yarn discharged from the melt spinning device is continuously fed between a first godet roller at 50 ° C. rotating at 900 m / min and a second godet roller at 160 ° C. rotating at 2800 m / min. After being drawn, the drawn conductive composite fiber drawn out of a 33dtex / 3f drawn conductive composite fiber (rupture strength: 2.9 cN / dtex, breaking elongation: 65%, wire resistance: 3.5E + 07Ω / cm) set in krill The fibers were mixed, subjected to bulk processing by jetting fluid at 160 ° C., and then wound up by a winder. The unwinding from the package was not stable, and the yarn was broken or the shape of the package collapsed, so that the yield of the obtained BCF was reduced.

1 溶融紡糸装置
2 未延伸導電性繊維
3 ガイド
4 油剤付与ローラー
5 第1ゴデットローラー
6 第2ゴデットローラー
7 嵩高加工装置
8 ワインダー
9 BCF
REFERENCE SIGNS LIST 1 melt spinning device 2 undrawn conductive fiber 3 guide 4 oil applying roller 5 first godet roller 6 second godet roller 7 bulk processing device 8 winder 9 BCF

Claims (4)

導電性カーボンブラックを20質量%以上、45質量%以下含有するポリアミドからなる導電層と、隠ぺい性無機顔料を5質量%以上含有するポリアミドからなる保護層とを有し、破断伸度が200〜600%であり、線抵抗値が1.0E+05〜9.9E+07Ω/cmであり、繊維横断面の全周長に対する導電層の露出周長の割合は8%未満である未延伸導電性複合繊維。 It has a conductive layer made of a polyamide containing 20% by mass or more and 45% by mass or less of a conductive carbon black, and a protective layer made of a polyamide containing 5% by mass or more of an opaque inorganic pigment. An undrawn conductive conjugate fiber having a line resistance of 1.0E + 05 to 9.9E + 07Ω / cm and a ratio of the exposed circumference of the conductive layer to the entire circumference of the fiber cross section of less than 8%. BCFを製造する際の延伸工程へ供給する請求項1記載の未延伸導電性複合繊維。 The undrawn conductive conjugate fiber according to claim 1, which is supplied to a drawing step in producing BCF. 繊維横断面における保護層の外周に3個以上の凸部を有する請求項1または2記載の未延伸導電性複合繊維。 The unstretched conductive conjugate fiber according to claim 1 or 2, wherein the non-stretched conductive conjugate fiber has three or more convex portions on the outer periphery of the protective layer in the fiber cross section. 非導電性繊維と導電性繊維と混繊してBCFを製造する方法であって、非導電性繊維を溶融紡糸する第1工程、溶融紡糸して得られた未延伸非導電性繊維と、請求項1〜3記載の未延伸導電性繊維を混繊して延伸する第2工程、混繊した延伸糸を流体噴射により嵩高加工する第3工程、得られた嵩高加工糸を巻き取る第4工程とを含むBCFの製造方法。 A method for producing a BCF by blending a non-conductive fiber and a conductive fiber, comprising: a first step of melt-spinning the non-conductive fiber; an undrawn non-conductive fiber obtained by melt-spinning; 4. A second step of blending and drawing the undrawn conductive fibers according to items 1 to 3, a third step of bulking the blended drawn yarn by fluid injection, and a fourth step of winding the obtained bulky processed yarn And a method for producing a BCF.
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57183426A (en) * 1981-05-08 1982-11-11 Kanebo Gosen Kk Conductive blended fiber yarn
JPS58163723A (en) * 1982-03-17 1983-09-28 Toray Ind Inc Electroconductive synthetic fiber
JPS6312711A (en) * 1986-07-01 1988-01-20 イー・アイ・デユポン・ドウ・ヌムール・アンド・カンパニー Method for combining and co-stretching antistatic filament and non-stretchable nylon filament
JPH07133510A (en) * 1993-11-08 1995-05-23 Kanebo Ltd Electrically-conductive conjugate yarn
JP2001172825A (en) * 1999-10-06 2001-06-26 Kuraray Co Ltd Electroconductive conjugate fiber

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57183426A (en) * 1981-05-08 1982-11-11 Kanebo Gosen Kk Conductive blended fiber yarn
JPS58163723A (en) * 1982-03-17 1983-09-28 Toray Ind Inc Electroconductive synthetic fiber
JPS6312711A (en) * 1986-07-01 1988-01-20 イー・アイ・デユポン・ドウ・ヌムール・アンド・カンパニー Method for combining and co-stretching antistatic filament and non-stretchable nylon filament
JPH07133510A (en) * 1993-11-08 1995-05-23 Kanebo Ltd Electrically-conductive conjugate yarn
JP2001172825A (en) * 1999-10-06 2001-06-26 Kuraray Co Ltd Electroconductive conjugate fiber

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