JP2014192771A - Earphone cord - Google Patents
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- JP2014192771A JP2014192771A JP2013067704A JP2013067704A JP2014192771A JP 2014192771 A JP2014192771 A JP 2014192771A JP 2013067704 A JP2013067704 A JP 2013067704A JP 2013067704 A JP2013067704 A JP 2013067704A JP 2014192771 A JP2014192771 A JP 2014192771A
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Description
本発明はイヤホンコードのテンションメンバーとして用いられる溶融異方性芳香族ポリエステル繊維において、イヤホンコードに加工した際の芯糸の断面形状を制御することにより、引張強力およびそのバラツキおいてすぐれた性能を持つイヤホンコードとその製造方法に関するものである。 In the present invention, the melt anisotropic aromatic polyester fiber used as a tension member of an earphone cord has excellent tensile strength and excellent performance in controlling the cross-sectional shape of the core yarn when processed into the earphone cord. The present invention relates to an earphone cord and a manufacturing method thereof.
イヤホンコードに代表される被覆電線のテンションメンバーに溶融異方性芳香族ポリエステル繊維を用いることは従来より行われている（例えば、特許文献１参照。）。イヤホンコードとして必要な物性としては、まず結節強力が一定以上あることと、その強力の斑が小さいことが重要であるが、従来の溶融異方性芳香族ポリエステル繊維をテンションメンバーに用いたイヤホンコードでは結節強力の平均値は一定以上あるものの、バラツキが大きいことが欠点として指摘されることがあった。 Conventionally, a melt anisotropic aromatic polyester fiber is used for a tension member of a covered electric wire represented by an earphone cord (see, for example, Patent Document 1). As physical properties necessary for earphone cords, it is important that the knot strength is at least a certain level and that the strength spots are small, but earphone cords using conventional fused anisotropic aromatic polyester fibers as tension members However, although the average value of nodule strength is more than a certain value, it has been pointed out as a disadvantage that the variation is large.
イヤホンコードの末端にあるイヤホンハウジングにおいて、多くの場合、イヤホンコードはハウジングの中で抜け防止のために結節が作られている。そしてその使用中、イヤホンがもっとも破断しやすい場所がハウジング内にある前記結節部である。従ってイヤホンコードの破断強力を評価する際、コードをハウジングに通して結節を作り、ハウジングに引っ掛けた後にハウジングを引っ張って破断強力を測定する方法が知られている。この時イヤホンコード内の芯線（テンションメンバーの芯糸の周囲に導電線を配したもの）は必ず結節部において破断するという問題点があった。 In the earphone housing at the end of the earphone cord, in many cases, the earphone cord is knotted in the housing to prevent it from coming off. And the place where the earphone is most easily broken during the use is the knot portion in the housing. Therefore, when evaluating the breaking strength of an earphone cord, a method is known in which a cord is passed through a housing to form a knot, and the housing is pulled after being hooked on the housing to measure the breaking strength. At this time, there was a problem that the core wire in the earphone cord (the conductor wire arranged around the core thread of the tension member) was always broken at the knot.
イヤホンコードの破断強力において、従来の溶融異方性芳香族ポリエステル繊維をテンションメンバーに用いたイヤホンコードは破断強力の平均値は高いものの、バラツキが大きいことが指摘されていた。本発明はイヤホンコードの破断強力のバラつきについて鋭意解析した結果、イヤホンコードの断面における芯糸の断面形状が影響を及ぼしていることをつきとめた。これは芯糸が扁平であると、イヤホンコードの結節部に応力がかかった場合に均一に破断することができないためと考えている。 Regarding the breaking strength of earphone cords, it has been pointed out that conventional earphone cords using melt-anisotropic aromatic polyester fibers as tension members have a large variation, although the average value of breaking strength is high. As a result of diligent analysis on the variation in breaking strength of the earphone cord, the present invention has found that the cross-sectional shape of the core yarn in the cross-section of the earphone cord has an effect. This is considered to be because if the core yarn is flat, it cannot be uniformly broken when stress is applied to the knot portion of the earphone cord.
本発明者等は上記問題点を解決するべく鋭意検討した結果、イヤホンコードに加工する際、芯糸の溶融異方性芳香族ポリエステル繊維の断面形状を制御することにより、単糸間の膠着が少なくなり、引張強力およびそのバラツキにおいて優れた性能を有するテンションメンバーが製造できることを見出し、本発明に到達した。 As a result of intensive studies to solve the above-mentioned problems, the present inventors have controlled the cross-sectional shape of the melt anisotropic aromatic polyester fiber of the core yarn when processing into the earphone cord, so that the sticking between the single yarns can be prevented. As a result, the inventors have found that a tension member having excellent performance in terms of tensile strength and variation can be produced, and the present invention has been achieved.
すなわち本発明は、繊維断面の最も長い径をａ、最も短い径をｂとしたときに、下記式（１）で表される扁平率ｆが０＜ｆ＜０．５となるような断面の溶融異方性芳香族ポリエステル繊維を芯糸に用いるイヤホンコードである。
ｆ＝（ａ−ｂ）／ａ ・・・ （１）
That is, the present invention has a cross section in which the flatness f represented by the following formula (1) is 0 <f <0.5, where a is the longest diameter of the fiber cross section and b is the shortest diameter. It is an earphone cord using a melt anisotropic aromatic polyester fiber as a core yarn.
f = (ab) / a (1)
さらに本発明は、好ましくはイヤホンコードをイヤホンハウジングに通してコード末端部に結節を作り、その結節をイヤホンハウジングに引っ掛けて作成した試験片をインストロンやオートグラフ等の万能試験機の片方にハウジングを固定し、もう片方にイヤホンコードを固定して引っ張り試験を行った際、結節破断荷重の平均値が５０Ｎ以上で、最低値が５０Ｎ以上、かつ結節破断荷重のバラつきがＣＶ値で３％以下である上記のイヤホンコードである。 Furthermore, the present invention preferably provides a test piece formed by passing the earphone cord through the earphone housing to make a nodule at the end of the cord and hooking the nodule to the earphone housing in one side of a universal testing machine such as Instron or Autograph. When the tensile test was performed with the earphone cord fixed to the other end, the average value of the nodal break load was 50N or more, the minimum value was 50N or more, and the variation in the nodal break load was 3% or less in CV value It is the above-mentioned earphone cord.
本発明によれば、イヤホンコードのテンションメンバーとして用いられる溶融異方性芳香族ポリエステル繊維において、イヤホンコードに加工した際の芯糸の断面形状を制御することにより、引張強力およびそのバラツキおいて優れた性能を持つイヤホンコードが得られる。 According to the present invention, in melt anisotropic aromatic polyester fiber used as a tension member of an earphone cord, by controlling the cross-sectional shape of the core yarn when processed into the earphone cord, it is excellent in tensile strength and its variation. Earphone cord with high performance can be obtained.
本発明のテンションメンバーに用いる溶融異方性芳香族ポリエステル繊維の溶融異方性とは溶融相において光学的異方性（液晶性）を示すことである。例えば試料をホットステージにのせ、窒素雰囲気下で昇温加熱し、試料の透過性を観察することで認定できる。本発明で用いるポリマーとしての溶融異方性芳香族ポリエステルとしては下記化１に示す反復構成単位の組み合わせからなるものが挙げられる。 The melt anisotropy of the melt-anisotropic aromatic polyester fiber used for the tension member of the present invention is to show optical anisotropy (liquid crystallinity) in the melt phase. For example, it can be recognized by placing the sample on a hot stage, heating and heating in a nitrogen atmosphere, and observing the permeability of the sample. Examples of the melt-anisotropic aromatic polyester as a polymer used in the present invention include those composed of a combination of repeating structural units represented by the following chemical formula (1).
特に好ましくは下記化２に示す反復構成単位の組み合わせからなるポリマーが好ましい。さらに好ましいのは（Ａ）及び（Ｂ）の反復構成単位（１１）からなる部分が６５％以上であるポリマーであり、特に（Ｂ）の成分が４〜４５重量％である芳香族ポリエステルが好ましい。 Particularly preferred is a polymer composed of a combination of repeating structural units shown in Chemical Formula 2 below. More preferred is a polymer in which the portion consisting of repeating structural units (11) of (A) and (B) is 65% or more, and in particular, an aromatic polyester in which the component (B) is 4 to 45% by weight is preferred. .
溶融異方性芳香族ポリエステルの融点（ＭＰ）は２６０〜３８０℃、特に２７０〜３５０℃が好ましい。ここでいう融点とは示差走査熱量（ＤＳＣ、例えばＭｅｔｔｌｅｒ社製、ＴＡ３０００）で観察される主吸熱ピークのピーク温度である（ＪＩＳ Ｋ７１２１）。具体的にはＤＳＣ（例えばＭｅｔｔｌｅｒ社製、ＴＡ３０００）装置にサンプルを１０〜２０ｍｇをとりアルミ製パンへ封入した後、キャリアーガスとして窒素を１００ｃｃ／分流し、２０℃／分で昇温したときの吸熱ピークを測定する。ポリマーの種類により上記１ｓｔ Ｒｕｎで明確な吸熱ピークが現れない場合は、５０℃／分の昇温速度で予想される流れ温度よりも５０℃高い温度まで昇温し、その温度で３分間完全に溶融した後、８０℃／分の速度で５０℃まで冷却し、しかる後に２０℃／分の昇温速度で吸熱ピークを測定するとよい。 The melting point (MP) of the melt anisotropic aromatic polyester is preferably 260 to 380 ° C, particularly preferably 270 to 350 ° C. The melting point here is the peak temperature of the main endothermic peak observed by differential scanning calorimetry (DSC, for example, TA3000, manufactured by Mettler) (JIS K7121). Specifically, after taking 10-20 mg of sample in a DSC (for example, Mettler, TA3000) sample and sealing it in an aluminum pan, nitrogen was flowed as a carrier gas at 100 cc / min and the temperature was raised at 20 ° C./min. Measure the endothermic peak. If a clear endothermic peak does not appear in the above 1st Run depending on the type of polymer, the temperature is raised to 50 ° C higher than the expected flow temperature at a heating rate of 50 ° C / min. After melting, it is preferably cooled to 50 ° C. at a rate of 80 ° C./min, and then the endothermic peak is measured at a temperature increase rate of 20 ° C./min.
また本発明の溶融異方性芳香族ポリエステルには本発明の効果を損なわない範囲で、ポリエチレンテレフタレ−ト、変性ポリエチレンテレフタレ−ト、ポリオレフィン、ポリカ−ボネ−ト、ポリアクリレ−ト、ポリアミド、ポリフェニレンサルファイド、ポリエステルエ−テルケトン、フッ素樹脂熱可塑性ポリマ−を添加しても良い。またカ−ボンブラック、染料や顔料等の着色剤、酸化防止剤、紫外線吸収剤、光安定剤等の各種添加剤を含んでいても良い。 In addition, the melt anisotropic aromatic polyester of the present invention includes polyethylene terephthalate, modified polyethylene terephthalate, polyolefin, polycarbonate, polyacrylate, polyamide, within the range not impairing the effects of the present invention. Polyphenylene sulfide, polyester ether ketone, or fluororesin thermoplastic polymer may be added. Various additives such as carbon black, colorants such as dyes and pigments, antioxidants, ultraviolet absorbers, and light stabilizers may also be included.
次に溶融異方性芳香族ポリエステル繊維の紡糸方法について述べる。本発明の全芳香族ポリエステル繊維は、常法によりポリマーを溶融紡糸して得られるが、該芳香族ポリエステルの融点よりさらに１０℃以上高い紡糸温度（かつ溶融液晶を形成している温度範囲内）で、剪断速度１０３ｓｅｃ−１以上、紡糸ドラフト２０以上の条件で紡糸するのが好ましい。かかる剪断速度および紡糸ドラフトで紡糸することにより、分子の配向化が進行し優れた強度等の性能を得ることができる。剪断速度（γ）は、ノズル半径をｒ（ｃｍ）、単孔当たりのポリマーと吐出量をＱ（ｃｍ３／ｓｅｃ）とするときｒ＝４Ｑ／πｒ３で計算される。ノズル横断面が円でない場合には、横断面積と同値の面積を有する円の半径をｒとする。 Next, a spinning method of melt anisotropic aromatic polyester fiber will be described. The wholly aromatic polyester fiber of the present invention can be obtained by melt spinning a polymer by a conventional method. The spinning temperature is higher by 10 ° C. or more than the melting point of the aromatic polyester (and within a temperature range in which a molten liquid crystal is formed). Thus, it is preferable to perform spinning under conditions of a shear rate of 10 3 sec −1 or more and a spinning draft of 20 or more. By spinning at such a shear rate and a spinning draft, the orientation of the molecules proceeds and performance such as excellent strength can be obtained. The shear rate (γ) is calculated by r = 4Q / πr 3 where r (cm) is the nozzle radius and Q (cm 3 / sec) is the polymer per single hole and the discharge amount. When the nozzle cross section is not a circle, the radius of a circle having an area equivalent to the cross-sectional area is defined as r.
紡糸原糸は熱処理することにより強度、弾性率をさらに向上させることが可能である。熱処理は（Ｍｐ−８０℃）〜Ｍｐの温度条件で行うのが好ましい。本発明の溶融異方性芳香族ポリエステル繊維の融点は熱処理温度を上げるに従い上昇するので熱処理方法としては段階的に温度を上昇させながら熱処理するのが好ましい。熱処理雰囲気としては窒素、アルゴン等の不活性ガスや空気等の活性ガス、あるいはそれらを組み合わせた雰囲気等が好適に用いられる。また上記熱処理を減圧条件下で行っても何等差し支えない。 The spinning yarn can be further improved in strength and elastic modulus by heat treatment. The heat treatment is preferably performed under a temperature condition of (Mp-80 ° C.) to Mp. Since the melting point of the melt-anisotropic aromatic polyester fiber of the present invention increases as the heat treatment temperature is raised, the heat treatment is preferably carried out while raising the temperature stepwise. As the heat treatment atmosphere, an inert gas such as nitrogen or argon, an active gas such as air, or a combination thereof is preferably used. Moreover, there is no problem even if the heat treatment is performed under reduced pressure.
本発明における重要な点は当該溶融異方性芳香族ポリエステル繊維を芯糸としてイヤホンコードを作成した際、その断面において繊維断面の最も長い径をａ、最も短い径をｂとしたときに、下記式（１）で表される扁平率ｆが０＜ｆ＜０．５となること、すなわち芯糸の扁平率が小さく、なるべく真円に近いことである。芯糸の断面が扁平になる、すなわち扁平率ｆが０．５以上となると、得られるイヤホンコードは引張強力が不十分なものとなる。
ｆ＝（ａ−ｂ）／ａ ・・・ （１）
The important point in the present invention is that when the earphone cord is prepared using the melt anisotropic aromatic polyester fiber as a core yarn, the longest diameter of the fiber cross section in the cross section is a, and the shortest diameter is b. That is, the flatness f expressed by the formula (1) is 0 <f <0.5, that is, the flatness of the core yarn is small and is as close to a perfect circle as possible. When the cross section of the core yarn becomes flat, that is, when the flat rate f is 0.5 or more, the obtained earphone cord has insufficient tensile strength.
f = (ab) / a (1)
芯糸の断面が扁平になる最も大きな要因は原糸が扁平な形で膠着していることである。本来、芯糸は銅線と共に撚糸された際に真円になるが、膠着が強いと単糸が自由に動くことができずに、撚糸しても綺麗な真円を形成できなくなるのである。従って芯糸を綺麗な真円にするためには原糸をできるだけ膠着のないものとすることが好ましい。 The biggest factor that the cross-section of the core yarn becomes flat is that the raw yarn is stuck in a flat shape. Originally, the core yarn becomes a perfect circle when twisted together with a copper wire, but if the sticking is strong, the single yarn cannot move freely, and even if it is twisted, a beautiful perfect circle cannot be formed. Therefore, in order to make the core yarn into a beautiful perfect circle, it is preferable to make the raw yarn as sticky as possible.
溶融異方性芳香族ポリエステル繊維の膠着を低減させる手段としては繊維表面に無機微粒子を付与した後にする熱処理することが特開２００４−１０７８２６号公報等に開示されているが、本発明の膠着回避手段としては本方法に限定されるものではない。 As a means for reducing the adhesion of the melt-anisotropic aromatic polyester fiber, a heat treatment after applying inorganic fine particles to the fiber surface is disclosed in Japanese Patent Application Laid-Open No. 2004-107826 and the like. The means is not limited to this method.
次にイヤホンコードの製造方法であるが、本発明においては芯線の太さ、及び被覆樹脂の素材、コードの太さなどは特に限定されるものではない。 A method for manufacturing an earphone cord will be described below. In the present invention, the thickness of the core wire, the material of the coating resin, the thickness of the cord, and the like are not particularly limited.
芯線の芯糸に用いる溶融異方性芳香族ポリエステル繊維の太さも特に限定されるものではなく、必要とされる芯線の太さ、イヤホンコードの太さに合わせて選択してよい。また導電線に関しても特に限定されるものではなく、軟銅線やこれに絶縁用のエナメルを被覆、塗布してなるエナメル線を複数本用いればよい。 The thickness of the melt anisotropic aromatic polyester fiber used for the core yarn of the core wire is not particularly limited, and may be selected according to the required core wire thickness and earphone cord thickness. The conductive wire is not particularly limited, and a plurality of soft copper wires or enamel wires obtained by coating and applying an enamel for insulation thereto may be used.
芯線はテンションメンバーとなる芯糸を中央に配し、その周囲を導電線で包むように芯糸と導電線を同時に撚糸することで形成されるが、導電線に軟銅線を用いてさらに複数本の芯線が必要となる場合は、それぞれの芯線を絶縁体で被覆することが必要である。 The core wire is formed by arranging the core yarn as a tension member in the center and twisting the core yarn and the conductive wire at the same time so as to wrap the periphery with the conductive wire. When core wires are required, it is necessary to coat each core wire with an insulator.
芯線の本数も特に限定されず、必要な信号線の数だけ用意されるが、一般的なイヤホンコードの場合は通常２本もしくは３本が用いられる。最後にこれらの芯線を纏めて絶縁性の樹脂で被覆することでイヤホンコードを得る。 The number of core wires is not particularly limited, and as many signal wires as necessary are prepared, but in the case of a general earphone cord, two or three are usually used. Finally, these core wires are collected and covered with an insulating resin to obtain an earphone cord.
次に得られたイヤホンコードの評価方法について説明する。インストロンやオートグラフ等の万能試験機を用いて結節破断荷重を測定することによりイヤホンコードの引張強力を評価できる。
まずイヤホンのハウジングを用意し、万能試験の一方のチャックに固定する。作成したイヤホンコードをハウジングのコードが通る穴に通し、コードの端に結節を１箇所作り、コードを引き戻して結節部がハウジングに引っかかり、抜けないことを確認する。ある程度コードを引っ張って緊張させ、その状態でもう片方のチャックにイヤホンコードを固定した後、引張試験を行い、ロードセルにて破断した際の強力を読む。本方法により、一つのコードに関して測定を２０回繰り返し、破断荷重の平均値を算出する。なお、固定するためのチャック等については測定するイヤホンコードに応じて選定するのがよい。またイヤホンハウジングを固定するための治具も用いたほうが良い。
Next, a method for evaluating the obtained earphone cord will be described. The tensile strength of the earphone cord can be evaluated by measuring the knot breaking load using a universal testing machine such as Instron or Autograph.
First, prepare the earphone housing and fix it to one chuck of the universal test. Pass the created earphone cord through the hole through which the cord of the housing passes, make one nodule at the end of the cord, pull back the cord and check that the nodule is caught in the housing and does not come off. Pull the cord to some extent and tighten it. After fixing the earphone cord to the other chuck, perform a tensile test and read the strength when the load cell breaks. By this method, the measurement is repeated 20 times for one cord, and the average value of the breaking load is calculated. Note that a chuck or the like for fixing should be selected according to the earphone cord to be measured. It is also better to use a jig for fixing the earphone housing.
本発明のイヤホンコードは、上記測定方法で測定した、結節破断荷重の平均値が５０Ｎ以上で、最低値が５０Ｎ以上、かつ結節破断荷重のバラつきがＣＶ値で３％以下であることが好ましい。結節破断荷重の平均値が５０Ｎより低い場合、最低値が５０Ｎより低い場合、あるいはＣＶ値が３％より大きい場合、十分な引張強力を持つイヤホンコードが得られない問題がある。より好ましくは結節破断荷重の平均値が６０Ｎ以上、最低値が５５Ｎ以上、ＣＶ値が２％以下である。 In the earphone cord of the present invention, it is preferable that the average value of the nodal break load measured by the measurement method is 50 N or more, the minimum value is 50 N or more, and the variation in the nodule break load is 3% or less in terms of the CV value. When the average value of the nodal break load is lower than 50N, when the minimum value is lower than 50N, or when the CV value is larger than 3%, there is a problem that an earphone cord having sufficient tensile strength cannot be obtained. More preferably, the average value of the nodal break load is 60N or more, the minimum value is 55N or more, and the CV value is 2% or less.
以下本発明を実施例により更に具体的に説明するが、本発明はこれら実施例に限定されるものではない。 EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited to these examples.
［実施例１］
前述化２で示した構成単位（Ａ）と（Ｂ）が７３／２７（ｍｏｌ％）である溶融異方性芳香族ポリエステル（ＭＰ：２８１℃）をポリマーとし、二軸押出機を用いて孔径０．１ｍｍφ、孔数１００Ｈノズルで３００ｄｔｅｘ／１００ｆのヤーンを紡糸した。得られた紡糸原糸に膠着防止のための無機微粒子を塗布し、窒素雰囲気下２６０℃で２０時間熱処理を行った。得られた繊維には激しい単糸間の膠着は認められなかった。
この溶融異方性芳香族ポリエステル繊維をテンションメンバーとして導電線と共に撚糸して芯線を作成、この芯線を２本束ねて絶縁樹脂で被覆してコード状にした。
このコードの断面における、芯糸の最も長い径をａ、最も短い径をｂとしたときに、前記式（１）で表される扁平率ｆを算出した。
得られたイヤホンコードを前述した評価方法により結節強力物性を測定した結果を表１に示した。
[Example 1]
The melt anisotropic aromatic polyester (MP: 281 ° C.) in which the structural units (A) and (B) shown in Chemical Formula 2 are 73/27 (mol%) is used as a polymer, and the pore size is measured using a twin screw extruder. A 300 dtex / 100 f yarn was spun with a nozzle of 0.1 mmφ and a hole number of 100H. The obtained spinning yarn was coated with inorganic fine particles for preventing sticking and heat-treated at 260 ° C. for 20 hours in a nitrogen atmosphere. The fiber obtained did not show severe sticking between single yarns.
The melt anisotropic aromatic polyester fiber was twisted with a conductive wire as a tension member to prepare a core wire, and two core wires were bundled and covered with an insulating resin to form a cord.
In the cross section of this cord, the flatness f represented by the above formula (1) was calculated, where a is the longest diameter of the core yarn and b is the shortest diameter.
Table 1 shows the results obtained by measuring the nodule strong physical properties of the obtained earphone cords by the evaluation method described above.
［実施例２］
熱処理時の窒素雰囲気温度を２７５℃にした以外は実施例１と同様にして得たイヤホンコードの結節強力の評価結果を表１に示した。
[Example 2]
Table 1 shows the evaluation results of the knot strength of the earphone cords obtained in the same manner as in Example 1 except that the nitrogen atmosphere temperature during heat treatment was changed to 275 ° C.
［比較例１］
実施例１の紡糸条件にて得たヤーンに対して無機微粒子を塗布することなく熱処理した以外は実施例１と同様にして得たイヤホンコードの結節強力の評価結果を表１に示した。
[Comparative Example 1]
Table 1 shows the evaluation results of the knot strength of the earphone cords obtained in the same manner as in Example 1 except that the yarn obtained under the spinning conditions of Example 1 was heat-treated without applying inorganic fine particles.
［比較例２］
紡糸ノズルに０．１５ｍｍφ、孔数５０Ｈを使用して３００ｄｔｅｘ／５０ｆのヤーンを得た後、無機微粒子を塗布することなく熱処理した以外は実施例１と同様にして得たイヤホンコードの引張強力の評価結果を表１に示した。
[Comparative Example 2]
The tensile strength of the earphone cord obtained in the same manner as in Example 1 was obtained except that a yarn of 300 dtex / 50f was obtained using a spinning nozzle of 0.15 mmφ and a hole number of 50H, and then heat-treated without applying inorganic fine particles. The evaluation results are shown in Table 1.
実施例１〜３のイヤホンコードは芯糸断面の扁平率が０．５より小さいので、イヤホンコードにした場合、十分な引張強力を有している。一方、芯糸断面の扁平率が０．５以上である比較例１〜２のイヤホンコードは結節破断荷重の最低値が５０Ｎ未満であり、さらにＣＶ値も３％より大きいので、引張強力およびそのバラツキにおいて劣るものであった。 In the earphone cords of Examples 1 to 3, the flatness of the cross section of the core yarn is smaller than 0.5. Therefore, when the earphone cords are used, the earphone cords have sufficient tensile strength. On the other hand, the earphone cords of Comparative Examples 1 and 2 in which the flatness of the cross section of the core yarn is 0.5 or more have a minimum knot breaking load of less than 50 N and a CV value of more than 3%. The variation was inferior.
本発明の断面形状が制御された溶融異方性芳香族ポリエステル繊維を芯糸に用いると、引張強力およびそのバラツキおいて優れた性能を有するイヤホンコードとして有用である。 When the melt anisotropic aromatic polyester fiber of which the cross-sectional shape is controlled according to the present invention is used as a core yarn, it is useful as an earphone cord having excellent tensile strength and performance in terms of variation.
Claims (2)
ｆ＝（ａ−ｂ）／ａ ・・・ （１） When the longest diameter of the fiber cross section is a and the shortest diameter is b, the melt anisotropic fragrance of the cross section in which the flatness f represented by the following formula (1) is 0 <f <0.5 Earphone cords that use a polyester fiber as the core yarn.
f = (ab) / a (1)
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20140056086A (en) * | 2012-10-31 | 2014-05-09 | 세브 에스아 | Ceramic coating with improved scratch resistance and thermal conduction properties |
| CN107105806A (en) * | 2015-01-09 | 2017-08-29 | 美津浓株式会社 | Dress material |
| CN113424276A (en) * | 2019-01-30 | 2021-09-21 | 株式会社自动网络技术研究所 | Insulated wire, wire harness, and method for manufacturing insulated wire |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108540920A (en) * | 2018-03-07 | 2018-09-14 | 赣州雄鼎电子有限公司 | A kind of making processing method of earphone wire |
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| JPS6257993A (en) * | 1985-09-04 | 1987-03-13 | 住友化学工業株式会社 | High strength rope |
| JP2006336147A (en) * | 2005-06-02 | 2006-12-14 | Kuraray Co Ltd | Ultrafine fiber of melt-anisotropic aromatic polyester |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20140056086A (en) * | 2012-10-31 | 2014-05-09 | 세브 에스아 | Ceramic coating with improved scratch resistance and thermal conduction properties |
| CN107105806A (en) * | 2015-01-09 | 2017-08-29 | 美津浓株式会社 | Dress material |
| CN107105806B (en) * | 2015-01-09 | 2020-02-21 | 美津浓株式会社 | Clothing material |
| US11116262B2 (en) | 2015-01-09 | 2021-09-14 | Mizuno Corporation | Garment |
| CN113424276A (en) * | 2019-01-30 | 2021-09-21 | 株式会社自动网络技术研究所 | Insulated wire, wire harness, and method for manufacturing insulated wire |
| CN113424276B (en) * | 2019-01-30 | 2023-01-06 | 株式会社自动网络技术研究所 | Insulated wire, wire harness, and method for manufacturing insulated wire |
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