JP2004342404A - Surface treatment method of coated wire and method of manufacturing coated wire - Google Patents

Surface treatment method of coated wire and method of manufacturing coated wire Download PDF

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JP2004342404A
JP2004342404A JP2003135998A JP2003135998A JP2004342404A JP 2004342404 A JP2004342404 A JP 2004342404A JP 2003135998 A JP2003135998 A JP 2003135998A JP 2003135998 A JP2003135998 A JP 2003135998A JP 2004342404 A JP2004342404 A JP 2004342404A
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Japan
Prior art keywords
electric wire
plasma
surface treatment
insulator layer
wire
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JP2003135998A
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Japanese (ja)
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JP4424649B2 (en
Inventor
Shigeru Kobayashi
茂 小林
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Yoshinogawa Electric Wire and Cable Co Ltd
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Yoshinogawa Electric Wire and Cable Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a surface treatment method of a coated wire capable of conducting the surface treatment of an insulator layer at high speed and improving the wettability of the insulator layer at high productivity, and to provide a method of manufacturing the coated wire. <P>SOLUTION: The surface treatment method of the coated wire 1A having the insulator layer in the periphery of a conductor is that surface treatment is conducted by irradiating plasma from at least a pair of atmospheric pressure plasma nozzles 31 arranged on the specified side of the coated wire 11A at predetermined intervals in the length direction of the coated wire 11A, and arranged in the different direction against the carrying direction of the coated wire 11A and inclining the irradiation direction of the plasma in the facing direction by only the predetermined amount, and thereby, the surface treatment of the coated wire 11A is conducted at high speed, and the wettability of the insulator layer is improved at high productivity. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【0001】
【発明の属する技術分野】
本発明は、フッ素系樹脂材料等で形成された絶縁体層を有する被覆電線の表面処理方法及び被覆電線の製造方法に関する。なお、被覆電線は、各種電気ケーブルの他、耐屈曲性シールド付きケーブルなどに好適に利用される。
【0002】
【従来の技術】
一般的に、被覆電線は、所定の直径を有する単線又は多心線からなる導体の表面に絶縁体層を施したものであり、絶縁体層としては、耐屈曲性用途にフッ素樹脂が用いられている。
【0003】
また、このような被覆電線は、導体に絶縁体層を連続的に押出成形することにより製造されるが、使用時に製品を識別できるように、製造時に絶縁体層表面に識別標識となる文字等を印字する。
【0004】
このようなマーキングを行う場合、インクジェット式記録ヘッドを用いて非接触で印字する試みがされている。しかしながら、このようなインクジェット式記録ヘッドで用いられるインクは一般的には、メチルエチルケトンのような溶剤にインク顔料や染料と接着剤とを溶解又は分散したものであるが、低付着性のフッ素系樹脂材料からなる絶縁体層には容易には印字できないという問題がある。
【0005】
一方、絶縁体層に直接金属メッキを施してシールドとしたものが提案されている。例えば、導体の外周に設けた紫外線硬化型樹脂からなるエナメル層上に、無電解メッキによる金属メッキシールドを設けた金属メッキシールドエナメル線が開示されている(例えば、特許文献1参照)。また、導体上にフッ素樹脂からなる絶縁体、絶縁体上に無電解金属メッキによる金属層、この上にさらに電解メッキによる金属層を設けた同軸ケーブルが開示されている(例えば、特許文献2参照)。さらに、導体上にフッ素樹脂からなる絶縁体、絶縁体上に塗布したABS樹脂被覆層、この被覆層上に設けられた無電解金属メッキによる金属層、この上にさらに電解メッキによる金属層を設けた同軸ケーブルが開示されている(例えば、特許文献3参照)。
【0006】
しかしながら、何れも細線のシールド付きケーブルを高生産性で製造するものではなく、構造が複雑であり、また、シールドの耐屈曲性に問題がある。すなわち、フッ素系樹脂材料からなる絶縁体層と金属メッキ層との密着性が悪く、シールドが剥離し易いという問題がある。
【0007】
そこで、印字やメッキを施した場合の密着性を向上させるために、絶縁体層の表面をあらして濡れ性を向上させるなどの処理が必要となる。
【0008】
【特許文献1】
特開平6−119824号公報 (特許請求の範囲)
【特許文献2】
特開2000−138013号公報 (特許請求の範囲)
【特許文献3】
特開2000−138014号公報 (特許請求の範囲)
【0009】
【発明が解決しようとする課題】
しかしながら、上述したように絶縁体層の表面をあらすためには、微粒子を照射して行う物理的な表面処理や、酸やアルカリで処理する化学的な表面処理などが考えられるが、何れも、表面処理スピードが遅い上、絶縁体層を被覆した被覆電線を連続的に処理する方法としては好ましくない。すなわち、被覆電線の搬送速度を上げて表面処理を行うと、その表面に対する印字や金属メッキ層の密着性が低下し、絶縁体層の表面から印字や金属メッキ層が剥離し易くなるという問題がある。特に、インクジェット式記録ヘッドにより絶縁体層の表面に印字を行う場合には、フッ素系樹脂材料からなる絶縁体層に対するインクの密着性が悪いため容易に印字することができず、印字が剥離し易くなるという問題がある。なお、インクジェット印字手段での印刷を高温環境下で行うことが考えられるが、高品位の印刷が難しいという問題がある。
【0010】
また、フッ素樹脂材料からなる絶縁体層への印字方法に関しては、YAGレーザ等による印字も考えられるが、維持コストが高いという問題がある。
【0011】
本発明はこのような事情に鑑み、絶縁体層の表面処理の高速化を図ることができ、且つ高生産性で絶縁体層の濡れ性を改善することができる被覆電線の表面処理方法及び被覆電線の製造方法を提供することを課題とする。
【0012】
【課題を解決するための手段】
前記課題を解決する本発明の第1の態様は、導体の周囲に絶縁体層を有する被覆電線の表面処理方法において、前記被覆電線の所定の側方に当該被覆電線の長手方向に沿って所定間隔を置いて配置されると共に当該被覆電線の搬送方向に対して異なる方向で且つプラズマの照射方向を相対向する方向に所定量傾斜させて配置された少なくとも一対の大気圧プラズマノズルからプラズマを照射することにより表面処理を行うことを特徴とする被覆電線の表面処理方法にある。
【0013】
かかる第1の態様では、一対の大気圧プラズマノズルをその先端同士が相対向するように異なる方向に所定量傾斜させて被覆電線側に対向して配置してプラズマ処理を行うことにより、絶縁体層表面のプラズマ処理の高速化を図ることができ、且つ高生産性で絶縁体層の濡れ性を改善することができる。
【0014】
本発明の第2の態様は、第1の態様において、前記大気圧プラズマノズルが、プラズマトリーターのノズルであることを特徴とする被覆電線の表面処理方法にある。
【0015】
かかる第2の態様では、プラズマトリーターの大気圧プラズマノズルからのプラズマを被覆電線に照射してプラズマ処理を行うことにより、絶縁体層の濡れ性を容易に改善することができる。
【0016】
本発明の第3の態様は、第1又は2の態様において、前記プラズマの照射を、前記被覆電線の搬送方向に対して50〜70°傾斜した方向から行うことを特徴とする被覆電線の表面処理方法にある。
【0017】
かかる第3の態様では、各大気圧プラズマノズルからのプラズマの照射を被覆電線の搬送方向に対して所定の角度だけ傾斜させた状態で行うことにより、絶縁体層表面のプラズマ処理の効率を向上させることができる。
【0018】
本発明の第4の態様は、第3の態様において、前記一対の大気圧プラズマノズルの先端同士の間隔が20mm以上であることを特徴とする被覆電線の表面処理方法にある。
【0019】
かかる第4の態様では、各大気圧プラズマノズルのプラズマの照射をノズル先端の間に所定の間隔を設けて行うことにより、被覆電線の絶縁体層の濡れ性が改善される。これにより、絶縁体層表面とその表面上に形成される印字や金属メッキ層との密着性が向上する。
【0020】
本発明の第5の態様は、第3又は4の態様において、前記大気圧プラズマノズルの先端と前記被覆電線との間隔が9〜20mmの範囲にあることを特徴とする被覆電線の表面処理方法にある。
【0021】
かかる第5の態様では、各大気圧プラズマノズルのプラズマの照射をノズル先端と被覆電線との間に所定の間隔を設けて行うことにより、絶縁体層表面のプラズマ処理の効率を向上させることができる。
【0022】
本発明の第6の態様は、第1〜5の何れかの態様において、前記一対の大気圧プラズマノズルを前記被覆電線に沿った異なる位置で且つ前記所定の側方とは異なる側方に複数配置して当該被覆電線の周囲の複数方向からプラズマの照射を行うことを特徴とする被覆電線の表面処理方法にある。
【0023】
かかる第6の態様では、プラズマの照射を被覆電線の周囲の複数方向から行うことにより、絶縁体層表面のプラズマ処理の効率を向上させることができる。
【0024】
本発明の第7の態様は、第1〜6の何れかの態様において、前記表面処理の後、濡れ性を向上させる対象の溶媒中に浸漬することを特徴とする被覆電線の表面処理方法にある。
【0025】
かかる第7の態様では、被覆電線の表面処理をした後、経時変化による濡れ性の低下が抑えられる。
【0026】
本発明の第8の態様は、第1〜7の何れかの態様の表面処理方法により表面処理を行う表面処理工程と、前記表面処理を施した後に、表面処理された被覆電線の絶縁体層表面にインクジェット印字手段を用いてマーキングを行う工程を具備することを特徴とする被覆電線の製造方法にある。
【0027】
かかる第8の態様では、一対の大気圧プラズマノズルをその先端部同士が相対向するように異なる方向に所定量傾斜させて被覆電線側に対向して配置してプラズマ処理を行うことにより、絶縁体層表面のプラズマ処理の高速化を図ることができ、且つ高生産性で絶縁体層の濡れ性を改善することができる。そして、被覆電線の絶縁体層の濡れ性が改善されているので、絶縁体層表面とその表面上に形成される印字との密着性が向上する。
【0028】
本発明の第9の態様は、第1〜7の何れかの態様の表面処理方法により表面処理を行う表面処理工程と、前記表面処理を施した後、表面処理された被覆電線の絶縁体層表面に金属メッキ層を形成する工程を具備することを特徴とする被覆電線の製造方法にある。
【0029】
かかる第9の態様では、一対の大気圧プラズマノズルをその先端部同士が相対向するように異なる方向に所定量傾斜させて被覆電線側に対向して配置してプラズマ処理を行うことにより、絶縁体層表面のプラズマ処理の高速化を図ることができ、且つ高生産性で絶縁体層の濡れ性を改善することができる。そして、被覆電線の絶縁体層の濡れ性が改善されているので、絶縁体層表面とその表面上に形成される金属メッキ層との密着性が向上する。
【0030】
本発明によると、少なくとも一対の大気圧プラズマノズルを、被覆電線の絶縁体層表面をプラズマ処理するのに最適な条件で配置することで、絶縁体層表面のプラズマ処理を高速で行うことができ、且つ高生産性で絶縁体層の濡れ性を改善することができる。
【0031】
すなわち、本発明では、一対の大気圧プラズマノズルをその先端同士が相対向するように異なる方向に所定量傾斜させて被覆電線側に対向して配置してプラズマ処理を行うことにより、絶縁体層表面のプラズマ処理の高速化を図ることができ、且つ高生産性で絶縁体層の濡れ性を改善することができる。特に、本発明では、大気圧プラズマノズルとしてプラズマトリーターを用いることで、比較的細い被覆電線に対しても効率よくプラズマ処理を施すことができる。また、従来の被覆電線の製造ラインに表面処理工程を容易に組み込み、効率よく表面処理を行うことができる。また、プラズマを発生するための処理ガスは特に限定されず、空気で行えばよいが、適宜ヘリウムなどの他の処理ガスを用いてもよい。
【0032】
ここで、本発明は、一対の大気圧プラズマノズルから照射されるプラズマが被覆電線の絶縁体層表面に効率よく接触する最適な条件について、例えば、絶縁体層の材質、表面改質をどの程度まで行うかなどを考慮しつつ、プラズマの照射角度、ノズル先端同士の間隔、あるいは各ノズル先端と被覆電線との間隔等を適宜検討した結果、以下に示す条件で一対の大気圧プラズマノズルを配置すれば、絶縁体層の表面処理の高速化を図ることができ、且つ高生産性で絶縁体層の濡れ性を改善できることが明確となった。
【0033】
例えば、各大気圧プラズマノズルからプラズマを照射する際には、被覆電線に対して50°〜70°傾斜した方向から照射するのが好ましい。表面処理を効率よく行うためである。特に、各大気圧プラズマノズルの照射角度を60°とするのが好ましい。これは、上述した角度の範囲において、プラズマ効果が最大、すなわち、絶縁体層表面の濡れ性を示す接触角が最も小さい角度となるからである。また、このような照射角度の範囲を外れた場合にも効率は低下するが、表面処理を行うことができる。さらに、本発明では、各大気圧プラズマノズルの照射角度のそれぞれは、上述した角度の範囲を満たしていれば特に限定されないが、±60°とするのが最も有効である。プラズマ効果が最大となる角度だからである。なお、このような照射角度は、表面処理を施す絶縁体層の材料によって有利な角度が異なるので、材料によって適宜有利な角度とすればよい。
【0034】
また、本発明では、一対の大気圧プラズマノズルは、各大気圧プラズマノズルのノズル先端同士の間に、被覆電線に対するプラズマの照射領域が緩衝しない程度の間隔を設けて配置するのが好ましい。これは、各大気圧プラズマノズルの照射領域が相互に緩衝してしまうと、プラズマ処理後の絶縁体層の表面状態にバラつきが生じ、その後の印字等に悪影響を及ぼす虞があるからである。したがって、例えば、ノズル先端同士の間隔を約20mm以上とするのが好ましい。これにより、各大気圧プラズマノズルから被覆電線に対して照射されるプラズマの照射領域が相互に緩衝することはない。また、各大気圧プラズマノズルの照射領域は、被覆電線に沿って相互に緩衝せずに実質的に連続しているのが特に好ましい。これにより、被覆電線のプラズマ処理を連続的に且つ効率よく行うことができる。
【0035】
さらに、各大気圧プラズマノズルのノズル先端と被覆電線との間には、約9〜20mmの間隔を設けるのが好ましく、好適には、10mm前後の間隔を設けるのがよい。これは、ノズル先端が被覆電線に対して近すぎると、表面処理後の絶縁体層の接触角が大きくなり好ましくないからである。反対に、ノズル先端を被覆電線から遠ざけすぎると、プラズマ処理を有効に行うことができないからである。
【0036】
また、各大気圧プラズマノズルからのプラズマの出力は、例えば、1.2mmφの電線を処理する場合には、電圧を450V以下とするのが好ましく、好適には、電圧を440〜400Vの範囲とするのがよい。このように、本発明では、プラズマの出力を電圧450V以下と比較的低出力に設定しても、絶縁体層の濡れ性を改善することができる。また、プラズマ処理を低出力で行えるので、コストの削減を図ることができるという効果もある。なお、プラズマの出力は、使用する機械によっても異なり、処理対象の電線の直径、照射されるプラズマの量、さらには、プラズマノズルから電線までの距離、処理速度などによっても異なるので、これに限定されるものではない。
【0037】
そして、このような各大気圧プラズマノズルの照射領域が緩衝しない条件を考慮して、上述した条件の範囲内で最も好適な条件としては、例えば、各大気圧プラズマノズルの照射角度を±60°、ノズル先端と被覆電線との間隔を10mm前後とし、ノズル先端同士の間隔を20mmとするのがよい。勿論、本発明は、これに限定されず、上述したように、絶縁体層の材質、表面改質をどの程度まで行うかなどを考慮しつつ、最適な条件を適宜選択すればよい。
【0038】
このように、本発明では、上述した条件で一対の大気圧プラズマノズルを配置することで、被覆電線の絶縁体層表面をプラズマ処理する際、例えば、被覆電線の搬送速度(処理速度)を従来速くて10m/min程度であったものを、その4倍の速さの40m/minに設定しても、絶縁体層表面に対する印字や金属メッキ層との密着性は良好である。また、絶縁体層の濡れ性は、例えば、蒸留水に対する接触角で測定すると、直径によっても異なるため、相対比較できるよう、直径を1.2mmとして統一評価したところ、約75°以下とすることができる。したがって、本発明の表面処理方法によれば、被覆電線の表面処理の高速化を図ることができ、且つ高生産性で絶縁体層表面の濡れ性を改善することができる。特に本発明によれば、フッ素系樹脂等からなる絶縁体層表面の濡れ性を有効に改善することができ、表面処理後の絶縁体層表面とその表面上に形成される印字や金属メッキ層との密着性が向上する。
【0039】
ここで、本発明では、プラズマをノズルから照射して被覆電線の周囲全体を表面処理する場合、あるいはプラズマ処理を複数回に分けて行う場合には、被覆電線の周囲の複数方向からプラズマを照射するのが好ましい。この場合には、例えば、一対の大気圧プラズマノズルを一組とし、これを被覆電線に沿って複数組配置して、被覆電線の長手方向に沿って異なる位置で且つ異なる方向からプラズマを照射するのが好ましい。表面処理を効率よく行うためである。このように被覆電線全体を表面処理することにより、その外周に設ける印字や金属メッキ層との密着性を改善することができる。
【0040】
ただし、連続的にマーキングを行う場合、少なくとも周方向の一方向の表面のみを表面処理すればよいので、この場合には、一方向からプラズマ処理を行えばよい。さらに、プラズマ処理の効率を上げるために、プラズマトリーターを搬送方向に複数箇所に配置してプラズマ処理を行ってもよい。
【0041】
また、本発明では、絶縁体層の表面処理を行った後、濡れ性を改善したい溶媒中、例えば、水中に浸漬しておくのが好ましい。これにより経時変化による濡れ性の低下を防止することができる。
【0042】
ここで、本発明の被覆電線に含まれる導線等の導体は、所定の直径を有する単線、例えば、直径30μm〜0.8mm程度の線材を単独で用いたものでもよいし、多心線、例えば、直径10〜120μm程度の極細線を複数本集合させたものでもよい。
【0043】
また、導体の周囲に絶縁体層を施した被覆電線の構造としては、単線に絶縁体層を被せた構造でも、多心線に絶縁体層を被せた構造でもよく、さらに、同軸線構造として中心の導体の周りに設けた絶縁体層上に導体を設けてさらに絶縁体層を設けた構造としてもよい。
【0044】
本発明では、導体としては、例えば、電気用軟銅、電気用硬銅、スズ含有銅合金、クロム−ジルコニウム含有銅合金又はその場繊維強化銅合金からなるものを挙げることができるが、その場繊維強化銅合金からなる導体が耐屈曲性の点では好ましい。
【0045】
ここで、その場繊維強化銅合金からなる導体は、繊維で強化された銅マトリックスであり、特に、繊維をその場で、すなわち、線材を形成する工程で形成した線材をいう。例えば、銅マトリックス中に、最大径2.5μm以下で平均径が1.0μm以下のその場形成繊維状クロムを含む線材等をいう。
【0046】
かかるその場繊維強化銅合金からなる導体は、例えば、クロム含有率1〜25重量%で残部が実質的に銅からなる合金材料を、必要に応じてスエージ加工し、続いて第1の冷間伸線加工を施し、次いで溶体化処理し、しかる後に第2の冷間伸線加工を施すことにより、銅マトリックス中で繊維状クロムをその場形成して線材を得、該線材を少なくとも一本用いて導体を形成することにより得られる。なお、材料となる合金材料としては、上述したものに限定されず、例えば、クロム含有率1〜25重量%で、銀又はジルコニウムの含有率が0.01〜8重量%で残部が実質的に銅からなる合金材料も用いることができる。
【0047】
このような複合材料からなる線材は、高導電性は電流が銅マトリックス中を流れることで確保でき、且つ機械的強度は繊維強化で確保でき、高機械的強度と高導電率の特性を併せもつ。
【0048】
本発明の被覆電線の絶縁体層としては、例えば同軸ケーブル用として、ポリエステル系樹脂、フッ素系樹脂、ポリスチレン系樹脂、ポリオレフィン系樹脂などを挙げることができる。しかしながら、低誘電率で細径化に好ましく且つ耐屈曲性の点ではフッ素系樹脂又はポリエチレンが好適であり、フッ素系樹脂が最も好適である。
【0049】
フッ素系樹脂としては、エチレンテトラフルオロエチレン共重合体(ETFE)、テトラフルオロエチレンパーフルオロアルコキシエチレン共重合体(PFA)、フルオロエチレンヘキサフルオロプロピレン共重合体(FEP)などを挙げることができる。このようなフッ素系樹脂は、例えば、撥水性、耐薬品性、耐溶剤性、耐熱性、耐屈曲性等に優れ、低誘電率であり、樹脂の中でも物性に優れている。特に、ETFEはコスト面及び表面処理の容易性から総合的に優れている。
【0050】
導体に絶縁体層を形成して被覆電線を製造する方法は、特に限定されず、例えば、導体の製造工程と絶縁体層の製造工程とを連続的に行ってもよいし、別工程としてもよいが、被覆工程の後、連続的に表面処理工程を行い、さらに、インクジェット印字手段によるマーキングを行うのが好ましい。
【0051】
なお、インクジェット印字手段は、被覆電線の表面にインク滴を吐出させて印字するものであれば特に限定されず、インクの種類も、水溶性インク、油溶性インクなど特に限定されない。
【0052】
本発明の被覆電線は、例えば、複数本撚りあわせ等したものにシールドを形成してシールド付きケーブルとしてもよいし、複数本を撚りあわせ等したものにさらに絶縁体層を設けた後、シースを設けたシールド付きケーブルとしてもよい。
【0053】
また、本発明の被覆電線は絶縁体層の濡れ性が改善されているので、その上に金属メッキ層を容易に形成することができる。すなわち、例えば、0.5μm〜6μmの厚さの金属メッキ層を形成するとシールドとして十分に作用し且つ耐屈曲性の面でも問題とならないシールドが得られ、剥離しがたいという利点がある。なお、このような金属メッキ層は、無電解メッキのみで形成しても、無電解メッキと電気メッキとを併せてもよい。また、スパッタリング、CVD、真空蒸着などの乾式法により形成してもよい。また、かかる金属メッキ層としては、銅、銀、ニッケル、金など、又はこれらの複合メッキや合金メッキを挙げることができる。
【0054】
【発明の実施の形態】
以下、本発明に係る被覆電線の表面処理方法及び被覆電線の製造方法について実施形態に基づいて詳細に説明する。
【0055】
(実施形態1)
図1には、本実施形態で製造する被覆電線の断面構造を示す。図1に示す被覆電線1は、単線の導体2に絶縁体層3を施したものである。すなわち、被覆電線1は、その場クロム繊維強化銅合金(クロム含有量約10%)からなる導体2にフッ素系樹脂からなる絶縁体層3を設けたものである。
【0056】
このような被覆電線1の製造工程を示す概略構成を図2に示す。図2に示すように、図示しない送出機から送られた導体11には、押出機12で絶縁体層3が形成されて被覆電線11Aとされた後、第1の冷却槽13、引取機14、水平ガイド15、垂直ガイド16を経て第2の冷却槽17へ導かれ、さらに、水平ガイド18、垂直ガイド19、引取機20を介して巻取機21へ巻き取られる。
【0057】
本実施形態では、第1の冷却槽13の直前に一対のプラズマトリーター31を配置し、第2の冷却槽17の前にロータリーエンコーダ32及びインクジェット印字ヘッド33を配置した。
【0058】
これによると、被覆電線11Aは、一対のプラズマトリーター31のプラズマにより表面処理され、その後、ロータリーエンコーダ32で測定された所定位置毎にインクジェット印字ヘッド33によりマーキングが施される。
【0059】
ここで、プラズマトリーター31を配置する位置は特に限定されず、少なくともインクジェット印字ヘッド33の上流側に設ければよく、例えば、図3に示すように、第1の冷却槽13と引取機14との間に配置してもよい。
【0060】
また、一対のプラズマトリーター31からのプラズマの照射方向は、後述する試験例に示すように、被覆電線11Aの搬送方向に対して±60°傾斜した方向から行うのが好ましい。すなわち、図4(a)に示すように、一対のプラズマトリーター31と被覆電線11Aとの成す角θを±60°とするのが好ましい。また、本実施形態では、各プラズマトリーター31のプラズマが照射されるノズル先端同士の間隔xを20mmとし、また、これら各ノズル先端と被覆電線11Aとの間隔yを10mmとした。
【0061】
このように、一対のプラズマトリーター31を配置することで、図4(b)に示すように、各プラズマトリーター31からの照射領域A,Bのそれぞれは相互に緩衝することなく、被覆電線11Aに沿ってほぼ連続的となる。このように、各照射領域A,Bを実質的に連続して設けることで、各照射領域の間に非照射領域が形成されることはなく、絶縁体層の表面状態がバラつくのを有効に防止でき、被覆電線11Aに沿ってプラズマ処理を効率よく行うことができる。
【0062】
また、プラズマトリーター31は、二台を一組として配置すれば、例えば、図5に示すように、被覆電線11Aの周方向に異なり且つ搬送方向に亘って異なる位置に、二組設けるようにしてもよい。勿論、三組又はそれ以上設けるようにしてもよい。これにより、絶縁体層表面の全周に亘ってさらに効率的にプラズマ処理を行うことができる。
【0063】
一方、インクジェット印字ヘッド33の配置も特に限定されず、印字後、少なくとも1秒程度乾燥させることができればよく、例えば、図6に示すように、第2の冷却槽17の後にロータリーエンコーダ32を設け、水平ガイド18及び垂直ガイド19の間にインクジェット印字ヘッド33を配置してもよい。
【0064】
ここで、以下に示すように、絶縁体層の表面処理の高速化を図ることができ、且つ高生産性で絶縁体層の濡れ性を改善できる一対のプラズマトリーターの配置について検討した。
【0065】
具体的には、まず、一つのプラズマトリーターから照射されるプラズマが被覆電線の絶縁体層表面に効率よく接触する最適な条件について、以下に示すように、プラズマの照射角度、プラズマの出力、ノズル先端と被覆電線との間隔y、プラズマトリーターの本数のそれぞれについて検討した。
【0066】
(プラズマの照射角度)
プラズマの出力を電圧424V、電流12.8A、ノズル先端と被覆電線との間隔yを10mm、被覆電線の搬送速度を10m/minにそれぞれ設定し、プラズマの照射角度を±60°、±45°とし、それぞれの条件で、被覆電線の表面処理を施した。そして、被覆電線の表面処理後の接触角をメニスカス法による接触角測定器により、被覆電線のプラズマが照射された部分を0°とし、被覆電線の周方向に90°間隔で接触角(°)を測定した。その結果を図7に示す。なお、図7は、プラズマの各照射角度における回転角度と接触角との関係を示すグラフである。
【0067】
図7に示すように、プラズマの照射角度は、±45°とするよりも±60°とすることで、絶縁体層表面の接触角を小さくできることが分かった。すなわち、プラズマトリーターのプラズマ照射角度を60°と設定することにより、絶縁体層表面の濡れ性を改善できることが分かった。
【0068】
(プラズマの出力)
プラズマの出力を電圧430V:電流12.7A、450V:14.4A、470V:16.5A、495V:18.5Aと変えて、ノズル先端と被覆電線との間隔yを10mm、被覆電線の搬送速度を10m/minにそれぞれ設定し、プラズマの照射角を60°として、被覆電線の表面処理を施した。そして、表面処理後の接触角をメニスカス法による接触角測定器により、被覆電線のプラズマが照射された部分を0°とし、被覆電線の周方向に90°間隔で接触角(°)を測定した。その結果を図8に示す。なお、図8は、プラズマの出力の変化に伴う回転角度と接触角度との関係を示すグラフである。
【0069】
図8に示すように、プラズマの出力を電圧495V、すなわち、電圧を大きく設定すれば、接触角を比較的小さくできるのは明らかであるが、これよりも、電圧を430Vと比較的低電圧に設定することで、絶縁体層表面の接触角を平均的に小さくできることが分かった。すなわち、プラズマトリーターからのプラズマ出力を低電圧条件に設定しても、絶縁体層表面の濡れ性を改善できることが分かった。
【0070】
(ノズル先端と被覆電線との間隔)
プラズマの出力を電圧424V、電流12.8A、処理速度を10m/min、プラズマの照射角度を90°とし、プラズマトリーターのプラズマが照射されるノズル先端と被覆電線との間隔yを5〜28mmと変化させて、被覆電線の表面処理を施した。そして、表面処理後の接触角(ここでは後退角)をメニスカス法による接触角測定器により、被覆電線のプラズマが照射された部分(回転角度0°)における接触角を測定した。その結果を図9に示す。なお、図9は、ノズル先端と被覆電線との間隔と、後退角との関係を示すグラフである。
【0071】
図9に示すように、ノズル先端と被覆電線との間隔yを10mm前後とした場合に後退角が最も小さいことが分かった。また、プラズマ未処理の場合の後退角を測定した結果、約75.2°であったことから、これを基準として評価したところ、ノズル先端と被覆電線との間隔yを9〜20mmの範囲とすることで、後退角を小さく、すなわち、絶縁体層表面の濡れ性を改善できることが分かった。
【0072】
(プラズマトリーターの本数)
プラズマトリーターを二本用意し、各プラズマトリーターを被覆電線の搬送方向と同一方向、すなわち、平行にそれぞれ60°傾斜させて、被覆電線の表面処理を施した。また、比較のため、一本のプラズマトリーターを同様に、被覆電線の搬送方向に60°傾斜させて、被覆電線の表面処理を施した。なお、プラズマトリーターの数以外の表面処理条件は同一とした。そして、表面処理後の接触角(ここでは後退角)をメニスカス法による接触角測定器により、被覆電線のプラズマが照射された部分を0°とし、被覆電線の周方向に90°間隔で接触角(°)を測定した。その結果を図10に示す。なお、図10は、ノズル先端と被覆電線との間隔と後退角との関係を示すグラフである。
【0073】
図10に示すように、プラズマトリーターを二本用いることで、絶縁体層表面の後退角を平均2°小さくすることができることが分かった。すなわち、プラズマトリーターを複数本用いることで、絶縁体層表面の濡れ性を改善できることが分かった。
【0074】
(ノズル先端同士の間隔)
次に、二本のプラズマトリーターから照射されるプラズマが被覆電線の絶縁体層表面に効率よく接触する最適な条件について、ノズル先端同士の間隔xについて検討した。また、ここでは、被覆電線の搬送速度を従来の4倍程度速くした場合におけるマーキングの耐久性についても検討した。
【0075】
具体的には、プラズマの出力を電圧400Vで電流13.8A、プラズマトリーターの傾斜角度を±60°、被覆電線の搬送速度を40m/min、ノズル先端と被覆電線との間隔yを10mmに設定して、二本のプラズマトリーターをそのノズル先端が相対向する位置に配置(図4参照)して、ノズル先端同士の間隔xを0、10、20、40、80、120、160mm(短い間隔から順番に、比較例1,2及び実施例1〜5)と変化させて、ETFEからなる絶縁体層により導体が被覆された被覆電線の表面処理を施した。そして、表面処理後の接触角(前進角及び後退角)をメニスカス法による接触角測定器により、被覆電線の周方向に90°間隔で測定した。その結果を下記表1に示す。
【0076】
【表1】

Figure 2004342404
【0077】
上記表1に示すように、実施例1〜5は、比較例1,2と比べて、前進角及び後退角を比較的小さくできることが分かった。特に後退角を小さくできることが分かった。このことから、ノズル先端同士の間隔xを20mm以上とすることで、絶縁体層の濡れ性を改善できることが分かった。
【0078】
(耐久試験)
プラズマトリーターを二本用意し、各プラズマトリーターを被覆電線の搬送方向と同一方向にそれぞれ60°傾斜させて、各プラズマトリーターを搬送方向に5cmずらして相対向する位置に平行に配置した。なお、プラズマの出力を電圧400Vで電流13.8A、プラズマトリーターの傾斜角度を±60°、ノズル先端と被覆電線との間隔yを10mmに設定した。そして、被覆電線の搬送速度を3.5m/min(比較例3)、10.5m/(比較例4)、40m/min(比較例5)に変えて、それぞれ、被覆電線の表面処理を施した。そして、上述した実施例1〜5及び比較例1〜5の条件で表面処理した絶縁体層の表面上にインクジェット印字ヘッド33でマーキングした印字の耐久性をピールテストで評価した。その結果を下記表2に示す。
【0079】
ピールテストでは、セロファンテープを印字の上に指腹で強く貼り付け、貼り付け面と45°の方向に瞬時に剥離し、印字がセロファンテープに移らなかったものを○、一部移ったものを△、全部移ったものを×として評価した。
【0080】
【表2】
Figure 2004342404
【0081】
上記表2に示すように、実施例1〜5は、ピールテストにおいて印字がセロファンテープに移らず、被覆電線の絶縁体層表面に残った。このことから、絶縁体層の濡れ性が改善されて、その絶縁体層表面と印字との密着性を向上できることは明らかである。
【0082】
また、実施例1〜5は、被覆電線の搬送速度を40m/minと設定しても、比較例3,4と同等、すなわち、搬送速度を3.5m/min,10.5m/minとした場合と同等の耐久性、すなわち、絶縁体層表面と印字との密着性が十分に得られることが分かった。また、比較例5は、全ての印字がセロファンテープに移ったが、これは、被覆電線の搬送速度が速すぎて、絶縁体層の表面を有効にプラズマ処理できなかったためと考えられる。
【0083】
この結果から、実施例1〜5のように二本のプラズマトリーターを配置することで、被覆電線の搬送速度を40m/minと比較的高速に設定しても、絶縁体層表面と印字との密着性を十分に確保できることが明らかとなった。
【0084】
また、比較例1,2においては、印字がセロファンテープに一部移ったが、全部は移らなかった。これは、各プラズマトリーターのノズル先端同士の間隔xが短かすぎて、プラズマの照射領域が緩衝し、絶縁体層の表面を有効に改善できなかったためと考えられる。なお、これら比較例1,2に関しては、ノズル先端同士の間隔x以外の条件を実施例1〜5と同じように最適化したので、絶縁体層表面と印字との密着性をある程度確保できたため、全ての印字がセロファンテープに移らなかったものと考えられる。
【0085】
(他の実施形態)
以上、本発明の実施形態について説明したが、勿論、本発明は上述の実施形態に限定されるものではない。
【0086】
例えば、上述した実施形態1では、導体2に絶縁体層3を施した被覆電線1を例示して説明したが、勿論これに限定されず、図11に示すように、絶縁体層42の表面に金属メッキをシールド44として設けたシールド付きケーブル40,40Aの製造に本発明の表面処理方法を適用してもよい。なお、図11は、他の実施形態に係るシールド付きケーブルの断面図である。具体的には、図11(a)に示すように、シールド付きケーブル40は、単線の導体41に絶縁体層42を施した被覆電線43に、シールド44を設け、シールド44上にETFEからなる外被覆層45を施し、外径約0.4mmとしたものである。被覆電線43は、その場クロム繊維強化合金(クロム含有量10%)からなる外径0.1mm(断面積0.008mm)の導体41に絶縁体層42を設けたものである。また、シールド44は、絶縁体層42の表面に大気圧プラズマ処理を施した後、無電解メッキにより銀からなる2μm厚の金属メッキを形成したものである。なお、図11(b)に示すように、その場クロム繊維強化銅合金からなる外径0.08mm(断面積0.005mm)の線を多心とした導体41Aを有する被覆電線43Aの絶縁体層42の外周にシールド44を設け、このシールド44の外周に外被覆層45を同様に設けたシールド付きケーブル40Aに本発明の表面処理方法を適用してもよい。
【0087】
【発明の効果】
以上説明したように、本発明によれば、被覆電線の所定の側方にその被覆電線の長手方向に沿って所定間隔を置いて配置されると共に被覆電線の搬送方向に対して異なる方向で且つ照射方向が相対向する方向に所定量傾斜させて配置された少なくとも一対の大気圧プラズマノズルからプラズマを照射することにより被覆電線の表面処理を行うようにしたので、絶縁体層の表面処理の高速化を図ることができ、且つ高生産性で絶縁体層の濡れ性を改善することができるという効果を奏する。
【図面の簡単な説明】
【図1】本発明の実施形態1に係る被覆電線の断面図である。
【図2】本発明の実施形態1に係る被覆電線の製造工程の概略を示す図である。
【図3】本発明の実施形態1に係る被覆電線の他の製造工程の概略を示す図である。
【図4】本発明の実施形態1に係るプラズマトリーターの配置例を示す図である。
【図5】本発明の実施形態1に係るプラズマトリーターの他の配置例を示す図である。
【図6】本発明の実施形態1に係る被覆電線の他の製造工程の概略を示す図である。
【図7】本発明の実施形態1に係るプラズマの照射角度の変化に伴う回転角度と接触角との関係を示すグラフである。
【図8】本発明の実施形態1に係るプラズマの出力値の変化に伴う回転角度と接触角との関係を示すグラフである。
【図9】本発明の実施形態1に係るノズル先端と被覆電線との間隔と、後退角との関係を示すグラフである。
【図10】本発明の実施形態1に係るノズル先端と被覆電線との間隔と後退角との関係を示すグラフである。
【図11】本発明の他の実施形態に係るシールド付きケーブルの断面図である。
【符号の説明】
1 被覆電線
2 導体
3 絶縁体層
11 導体
11A 被覆電線
31 プラズマトリーター
33 インクジェット印字ヘッド[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for treating a surface of a covered electric wire having an insulator layer formed of a fluorine-based resin material or the like and a method for manufacturing the covered electric wire. The insulated wire is suitably used for various electric cables as well as cables with a flexible shield.
[0002]
[Prior art]
In general, a coated electric wire is one in which an insulator layer is applied to a surface of a conductor formed of a single wire or a multi-core wire having a predetermined diameter, and as the insulator layer, a fluorine resin is used for bending resistance use. ing.
[0003]
In addition, such a covered electric wire is manufactured by continuously extruding an insulator layer on a conductor, and a character or the like that serves as an identification mark on the surface of the insulator layer during manufacture so that the product can be identified during use. Is printed.
[0004]
In the case of performing such marking, attempts have been made to perform non-contact printing using an ink jet recording head. However, the ink used in such an ink jet recording head is generally obtained by dissolving or dispersing an ink pigment, a dye and an adhesive in a solvent such as methyl ethyl ketone. There is a problem that printing cannot be easily performed on an insulator layer made of a material.
[0005]
On the other hand, there has been proposed a shield formed by directly applying metal plating to an insulator layer. For example, a metal-plated shield enameled wire in which a metal-plated shield formed by electroless plating is provided on an enamel layer made of an ultraviolet-curable resin provided on the outer periphery of a conductor (see, for example, Patent Document 1). Also disclosed is a coaxial cable in which an insulator made of a fluororesin is provided on a conductor, a metal layer is formed on the insulator by electroless metal plating, and a metal layer is further provided on the insulator by electrolytic plating (see, for example, Patent Document 2). ). Furthermore, an insulator made of fluororesin on the conductor, an ABS resin coating layer applied on the insulator, a metal layer formed by electroless metal plating provided on the coating layer, and a metal layer formed by electrolytic plating are further provided thereon. (See, for example, Patent Document 3).
[0006]
However, none of these methods produce a shielded cable of a fine wire with high productivity, the structure is complicated, and there is a problem in the bending resistance of the shield. That is, there is a problem that the adhesion between the insulator layer made of the fluorine resin material and the metal plating layer is poor, and the shield is easily peeled.
[0007]
Therefore, in order to improve the adhesion when printing or plating is performed, a treatment such as exposing the surface of the insulator layer to improve the wettability is required.
[0008]
[Patent Document 1]
JP-A-6-119824 (Claims)
[Patent Document 2]
JP 2000-138013A (Claims)
[Patent Document 3]
JP 2000-138014 A (Claims)
[0009]
[Problems to be solved by the invention]
However, in order to expose the surface of the insulator layer as described above, a physical surface treatment performed by irradiating fine particles, a chemical surface treatment performed with an acid or an alkali, and the like can be considered. The surface treatment speed is low, and it is not preferable as a method for continuously treating the coated electric wire coated with the insulator layer. That is, if the surface treatment is performed by increasing the transport speed of the coated electric wire, the adhesion of the printing and the metal plating layer to the surface is reduced, and the printing and the metal plating layer are easily peeled off from the surface of the insulator layer. is there. In particular, when printing is performed on the surface of the insulator layer by an ink jet recording head, the ink cannot be easily printed due to poor adhesion of the ink to the insulator layer made of a fluorine-based resin material, and the print is peeled off. There is a problem that it becomes easier. In addition, it is conceivable to perform printing by the inkjet printing means in a high-temperature environment, but there is a problem that high-quality printing is difficult.
[0010]
As for a method of printing on an insulating layer made of a fluororesin material, printing with a YAG laser or the like can be considered, but there is a problem that the maintenance cost is high.
[0011]
In view of such circumstances, the present invention provides a method and a method for coating a coated electric wire, which can speed up the surface treatment of the insulator layer, and can improve the wettability of the insulator layer with high productivity. It is an object to provide a method for manufacturing an electric wire.
[0012]
[Means for Solving the Problems]
A first aspect of the present invention for solving the above-mentioned problem is a surface treatment method of a covered electric wire having an insulator layer around a conductor, wherein a predetermined side of the covered electric wire is provided along a longitudinal direction of the covered electric wire. Plasma is radiated from at least one pair of atmospheric pressure plasma nozzles that are arranged at an interval and are inclined at a predetermined amount in directions different from the transport direction of the coated electric wire and in opposite directions to the plasma irradiation direction. A surface treatment method for the coated electric wire, wherein the surface treatment is performed by performing the surface treatment.
[0013]
In the first aspect, the plasma treatment is performed by arranging a pair of atmospheric pressure plasma nozzles at a predetermined angle in different directions so that the tips thereof face each other, and arranging them so as to face the coated electric wire side to perform the plasma processing. The speed of the plasma treatment of the layer surface can be increased, and the wettability of the insulator layer can be improved with high productivity.
[0014]
According to a second aspect of the present invention, there is provided the surface treatment method for a coated electric wire according to the first aspect, wherein the atmospheric pressure plasma nozzle is a nozzle of a plasma treater.
[0015]
In the second aspect, the wettability of the insulator layer can be easily improved by performing the plasma treatment by irradiating the coated electric wire with the plasma from the atmospheric pressure plasma nozzle of the plasma treater.
[0016]
According to a third aspect of the present invention, in the first or second aspect, the plasma irradiation is performed from a direction inclined by 50 to 70 ° with respect to a transport direction of the coated electric wire. Processing method.
[0017]
In the third aspect, the efficiency of the plasma treatment on the surface of the insulator layer is improved by performing the irradiation of the plasma from each of the atmospheric pressure plasma nozzles at a predetermined angle with respect to the transport direction of the coated electric wire. Can be done.
[0018]
A fourth aspect of the present invention is the method for treating a surface of a covered electric wire according to the third aspect, wherein a distance between the tips of the pair of atmospheric pressure plasma nozzles is 20 mm or more.
[0019]
In the fourth aspect, by irradiating the plasma of each atmospheric pressure plasma nozzle at a predetermined interval between the nozzle tips, the wettability of the insulator layer of the covered electric wire is improved. Thereby, the adhesion between the surface of the insulator layer and the printed or metal plated layer formed on the surface is improved.
[0020]
According to a fifth aspect of the present invention, in the third or fourth aspect, the distance between the tip of the atmospheric pressure plasma nozzle and the covered wire is in a range of 9 to 20 mm. It is in.
[0021]
In the fifth aspect, the efficiency of the plasma treatment on the surface of the insulator layer can be improved by irradiating the plasma of each atmospheric pressure plasma nozzle at a predetermined interval between the nozzle tip and the coated electric wire. it can.
[0022]
According to a sixth aspect of the present invention, in any one of the first to fifth aspects, the pair of atmospheric pressure plasma nozzles are arranged at different positions along the coated electric wire and on a side different from the predetermined side. There is provided a surface treatment method for a covered electric wire, which comprises arranging and irradiating plasma from a plurality of directions around the covered electric wire.
[0023]
In the sixth aspect, by performing plasma irradiation from a plurality of directions around the covered electric wire, the efficiency of the plasma treatment of the surface of the insulator layer can be improved.
[0024]
A seventh aspect of the present invention is the surface treatment method for a coated electric wire according to any one of the first to sixth aspects, wherein after the surface treatment, the coated wire is immersed in a solvent to be improved in wettability. is there.
[0025]
In the seventh aspect, after the surface treatment of the coated electric wire, a decrease in wettability due to a change with time is suppressed.
[0026]
According to an eighth aspect of the present invention, there is provided a surface treatment step of performing a surface treatment by the surface treatment method according to any one of the first to seventh aspects, and an insulator layer of the coated electric wire which has been subjected to the surface treatment after the surface treatment. A method of manufacturing a covered electric wire, comprising a step of performing marking on the surface using an ink jet printing means.
[0027]
In the eighth aspect, the plasma treatment is performed by arranging a pair of atmospheric pressure plasma nozzles at a predetermined angle in different directions so that the tips of the nozzles are opposed to each other and facing the coated electric wire side to perform plasma processing. The speed of the plasma treatment of the body layer surface can be increased, and the wettability of the insulator layer can be improved with high productivity. Since the wettability of the insulator layer of the covered electric wire is improved, the adhesion between the surface of the insulator layer and a print formed on the surface is improved.
[0028]
According to a ninth aspect of the present invention, there is provided a surface treatment step of performing a surface treatment by the surface treatment method according to any one of the first to seventh aspects, and an insulator layer of the coated electric wire which has been subjected to the surface treatment and then surface-treated. A method of manufacturing a covered electric wire, comprising a step of forming a metal plating layer on a surface.
[0029]
In the ninth aspect, the plasma treatment is performed by arranging a pair of atmospheric pressure plasma nozzles at a predetermined angle in different directions so that the tips of the nozzles are opposed to each other and facing the coated electric wire side to perform plasma processing. The speed of the plasma treatment of the body layer surface can be increased, and the wettability of the insulator layer can be improved with high productivity. Since the wettability of the insulator layer of the covered electric wire is improved, the adhesion between the surface of the insulator layer and the metal plating layer formed on the surface is improved.
[0030]
According to the present invention, by arranging at least one pair of atmospheric pressure plasma nozzles under conditions optimal for performing a plasma treatment on the surface of the insulator layer of the covered electric wire, the plasma treatment on the surface of the insulator layer can be performed at a high speed. In addition, the wettability of the insulator layer can be improved with high productivity.
[0031]
That is, in the present invention, the plasma treatment is performed by arranging a pair of atmospheric pressure plasma nozzles at a predetermined angle in different directions so that their tips face each other, and arranging them in opposition to the coated electric wire side to perform plasma treatment. The speed of the plasma treatment on the surface can be increased, and the wettability of the insulator layer can be improved with high productivity. In particular, in the present invention, by using a plasma treater as the atmospheric pressure plasma nozzle, it is possible to efficiently perform a plasma treatment even on a relatively thin covered electric wire. Further, the surface treatment step can be easily incorporated into a conventional coated electric wire production line, and the surface treatment can be performed efficiently. Further, the processing gas for generating plasma is not particularly limited, and may be air, but another processing gas such as helium may be used as appropriate.
[0032]
Here, the present invention relates to the optimum conditions under which the plasma irradiated from the pair of atmospheric pressure plasma nozzles efficiently contacts the insulator layer surface of the coated electric wire, for example, how much the material and surface modification of the insulator layer As a result of appropriately examining the plasma irradiation angle, the interval between the nozzle tips, the interval between each nozzle tip and the coated electric wire, etc., taking into account whether or not to perform, a pair of atmospheric pressure plasma nozzles are arranged under the following conditions It has been clarified that the speed of the surface treatment of the insulator layer can be increased, and the wettability of the insulator layer can be improved with high productivity.
[0033]
For example, when irradiating plasma from each atmospheric pressure plasma nozzle, it is preferable to irradiate the coated electric wire from a direction inclined by 50 ° to 70 °. This is for performing the surface treatment efficiently. In particular, the irradiation angle of each atmospheric pressure plasma nozzle is preferably set to 60 °. This is because the plasma effect is maximum in the above-mentioned angle range, that is, the contact angle indicating the wettability of the insulator layer surface is the smallest angle. When the irradiation angle is out of the range, the surface treatment can be performed although the efficiency is reduced. Furthermore, in the present invention, each of the irradiation angles of each atmospheric pressure plasma nozzle is not particularly limited as long as it satisfies the above-mentioned angle range, but it is most effective to be ± 60 °. This is because the angle at which the plasma effect is maximized. Note that such an irradiation angle varies depending on the material of the insulator layer to be subjected to the surface treatment, and thus may be appropriately set as an advantageous angle depending on the material.
[0034]
Further, in the present invention, it is preferable that the pair of atmospheric pressure plasma nozzles be arranged between the nozzle ends of the atmospheric pressure plasma nozzles at intervals such that the irradiation area of the plasma to the coated electric wire does not buffer. This is because, if the irradiation areas of the atmospheric pressure plasma nozzles buffer each other, the surface state of the insulator layer after the plasma treatment varies, which may adversely affect subsequent printing and the like. Therefore, for example, it is preferable that the interval between the nozzle tips is about 20 mm or more. Thereby, the irradiation area of the plasma irradiated from each atmospheric pressure plasma nozzle to the coated electric wire does not buffer each other. It is particularly preferable that the irradiation area of each atmospheric pressure plasma nozzle is substantially continuous along the coated electric wire without buffering each other. Thereby, the plasma treatment of the coated electric wire can be performed continuously and efficiently.
[0035]
Further, it is preferable to provide an interval of about 9 to 20 mm between the nozzle tip of each atmospheric pressure plasma nozzle and the coated electric wire, and it is preferable to provide an interval of about 10 mm. This is because if the tip of the nozzle is too close to the coated electric wire, the contact angle of the insulator layer after the surface treatment becomes large, which is not preferable. Conversely, if the tip of the nozzle is too far away from the coated electric wire, the plasma treatment cannot be effectively performed.
[0036]
Further, the output of the plasma from each atmospheric pressure plasma nozzle is, for example, when processing an electric wire of 1.2 mmφ, the voltage is preferably 450 V or less, preferably, the voltage is in the range of 440 to 400 V Good to do. As described above, in the present invention, the wettability of the insulator layer can be improved even when the output of the plasma is set to a relatively low output of 450 V or less. Further, since the plasma processing can be performed with a low output, there is also an effect that cost can be reduced. In addition, the output of the plasma varies depending on the machine used, and varies depending on the diameter of the electric wire to be processed, the amount of plasma to be irradiated, the distance from the plasma nozzle to the electric wire, the processing speed, and the like. It is not done.
[0037]
In consideration of such a condition that the irradiation area of each atmospheric pressure plasma nozzle does not buffer, as the most preferable condition within the above-described range, for example, the irradiation angle of each atmospheric pressure plasma nozzle is ± 60 ° The distance between the nozzle tip and the coated electric wire is preferably about 10 mm, and the distance between the nozzle tips is preferably 20 mm. Of course, the present invention is not limited to this, and as described above, the optimum conditions may be appropriately selected in consideration of the material of the insulator layer and the extent to which the surface modification is performed.
[0038]
As described above, in the present invention, when the pair of atmospheric pressure plasma nozzles are arranged under the above-described conditions, when the insulating layer surface of the coated electric wire is subjected to the plasma treatment, for example, the conveying speed (processing speed) of the coated electric wire is conventionally reduced. Even if the speed is as high as about 10 m / min, but is set to 40 m / min, which is four times faster, the printing on the insulating layer surface and the adhesion to the metal plating layer are good. In addition, since the wettability of the insulator layer varies depending on the diameter when measured, for example, by the contact angle with distilled water, the diameter is set to 1.2 mm so that the relative comparison can be made. Can be. Therefore, according to the surface treatment method of the present invention, the speed of the surface treatment of the coated electric wire can be increased, and the wettability of the insulator layer surface can be improved with high productivity. In particular, according to the present invention, it is possible to effectively improve the wettability of the surface of the insulator layer made of a fluorine-based resin or the like, and the surface of the insulator layer after the surface treatment and the printing or metal plating layer formed on the surface. And the adhesion to the film are improved.
[0039]
Here, in the present invention, when the plasma is irradiated from the nozzle to perform a surface treatment on the entire periphery of the covered electric wire, or when the plasma treatment is performed in a plurality of times, the plasma is irradiated from a plurality of directions around the covered electric wire. Is preferred. In this case, for example, a set of a pair of atmospheric pressure plasma nozzles is arranged, and a plurality of sets of the atmospheric pressure plasma nozzles are arranged along the covered electric wire to irradiate the plasma at different positions along the longitudinal direction of the covered electric wire and from different directions. Is preferred. This is for performing the surface treatment efficiently. By performing the surface treatment on the entire covered electric wire as described above, it is possible to improve the printing provided on the outer periphery and the adhesion to the metal plating layer.
[0040]
However, in the case of performing continuous marking, at least only the surface in one direction in the circumferential direction may be subjected to the surface treatment. In this case, the plasma treatment may be performed from one direction. Further, in order to increase the efficiency of the plasma processing, the plasma processing may be performed by disposing the plasma treater at a plurality of locations in the transport direction.
[0041]
Further, in the present invention, after performing the surface treatment of the insulator layer, it is preferable that the insulator layer is immersed in a solvent whose wettability is to be improved, for example, water. This can prevent a decrease in wettability due to a change with time.
[0042]
Here, the conductor such as a conductive wire included in the covered electric wire of the present invention may be a single wire having a predetermined diameter, for example, a wire having a diameter of about 30 μm to 0.8 mm alone or a multi-core wire, for example. A plurality of ultrafine wires having a diameter of about 10 to 120 μm may be collected.
[0043]
The structure of the coated electric wire in which an insulator layer is provided around the conductor may be a structure in which a single wire is covered with an insulator layer, a structure in which a multi-core wire is covered with an insulator layer, or a coaxial wire structure. A structure in which a conductor is provided on an insulator layer provided around a center conductor and an insulator layer is further provided may be employed.
[0044]
In the present invention, examples of the conductor include soft copper for electric use, hard copper for electric use, tin-containing copper alloy, chromium-zirconium-containing copper alloy or in-situ fiber-reinforced copper alloy. A conductor made of a reinforced copper alloy is preferable in terms of bending resistance.
[0045]
Here, the conductor made of the in-situ fiber-reinforced copper alloy is a copper matrix reinforced with fibers, and particularly refers to a wire formed in situ, that is, in a step of forming a wire. For example, it refers to a wire rod or the like containing in-situ formed fibrous chromium having a maximum diameter of 2.5 μm or less and an average diameter of 1.0 μm or less in a copper matrix.
[0046]
Such an in-situ fiber-reinforced copper alloy conductor is, for example, swaged, if necessary, from an alloy material consisting essentially of copper with a chromium content of 1 to 25% by weight, followed by a first cold working. By performing wire drawing, then solution treatment, and then performing a second cold drawing, fibrous chromium is formed in situ in a copper matrix to obtain a wire, and at least one wire is used. To form a conductor. The alloy material used as the material is not limited to those described above. For example, the chromium content is 1 to 25% by weight, the silver or zirconium content is 0.01 to 8% by weight, and the balance is substantially the same. An alloy material made of copper can also be used.
[0047]
A wire made of such a composite material can ensure high conductivity by a current flowing in a copper matrix, and can secure mechanical strength by fiber reinforcement, and has both high mechanical strength and high conductivity. .
[0048]
Examples of the insulator layer of the coated electric wire of the present invention include polyester resins, fluorine resins, polystyrene resins, and polyolefin resins for coaxial cables. However, a fluororesin or polyethylene is preferred in terms of low dielectric constant and a favorable diameter reduction and bending resistance, and a fluororesin is most preferred.
[0049]
Examples of the fluorine-based resin include ethylene tetrafluoroethylene copolymer (ETFE), tetrafluoroethylene perfluoroalkoxyethylene copolymer (PFA), and fluoroethylene hexafluoropropylene copolymer (FEP). Such a fluorine-based resin has, for example, excellent water repellency, chemical resistance, solvent resistance, heat resistance, bending resistance, and the like, has a low dielectric constant, and has excellent physical properties among resins. In particular, ETFE is generally superior in terms of cost and ease of surface treatment.
[0050]
The method of manufacturing an insulated wire by forming an insulator layer on a conductor is not particularly limited, and, for example, a process of manufacturing a conductor and a process of manufacturing an insulator layer may be performed continuously, or as a separate process. Preferably, after the coating step, a surface treatment step is continuously performed, and further, marking is performed by an ink jet printing unit.
[0051]
The ink-jet printing means is not particularly limited as long as it prints by discharging ink droplets on the surface of the covered electric wire, and the type of ink is not particularly limited, such as water-soluble ink and oil-soluble ink.
[0052]
The coated electric wire of the present invention may be, for example, a shielded cable formed by twisting a plurality of wires, or a shielded cable, or further providing an insulator layer on a twisted plurality of wires, and then forming a sheath. It may be a shielded cable provided.
[0053]
Further, the coated electric wire of the present invention has improved wettability of the insulator layer, so that a metal plating layer can be easily formed thereon. That is, for example, when a metal plating layer having a thickness of 0.5 μm to 6 μm is formed, a shield which sufficiently functions as a shield and has no problem in terms of bending resistance is obtained, and has an advantage that it is difficult to peel off. Note that such a metal plating layer may be formed only by electroless plating, or may be a combination of electroless plating and electroplating. Further, it may be formed by a dry method such as sputtering, CVD, or vacuum evaporation. Examples of such a metal plating layer include copper, silver, nickel, gold, and the like, or composite plating or alloy plating of these.
[0054]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a surface treatment method of a covered electric wire and a method of manufacturing a covered electric wire according to the present invention will be described in detail based on embodiments.
[0055]
(Embodiment 1)
FIG. 1 shows a cross-sectional structure of a coated electric wire manufactured in the present embodiment. The insulated wire 1 shown in FIG. 1 is obtained by applying an insulator layer 3 to a single conductor 2. That is, the covered electric wire 1 is obtained by providing an insulator layer 3 made of a fluororesin on a conductor 2 made of an in-situ chromium fiber reinforced copper alloy (chromium content: about 10%).
[0056]
FIG. 2 shows a schematic configuration showing a manufacturing process of such a covered electric wire 1. As shown in FIG. 2, an insulator layer 3 is formed on a conductor 11 sent from a sending device (not shown) by an extruder 12 to form a covered electric wire 11 </ b> A, and then a first cooling tank 13 and a take-off device 14 are provided. , Through a horizontal guide 15 and a vertical guide 16, to a second cooling tank 17, and further wound up by a winder 21 through a horizontal guide 18, a vertical guide 19, and a take-up machine 20.
[0057]
In the present embodiment, a pair of plasma treaters 31 is disposed immediately before the first cooling tank 13, and the rotary encoder 32 and the inkjet print head 33 are disposed before the second cooling tank 17.
[0058]
According to this, the coated electric wire 11 </ b> A is subjected to surface treatment by the plasma of the pair of plasma treaters 31, and thereafter, marking is performed by the ink jet print head 33 at each predetermined position measured by the rotary encoder 32.
[0059]
Here, the position where the plasma treater 31 is disposed is not particularly limited, and may be provided at least on the upstream side of the inkjet print head 33. For example, as shown in FIG. May be arranged between them.
[0060]
Further, as shown in a test example described later, the irradiation direction of the plasma from the pair of plasma treaters 31 is preferably performed in a direction inclined by ± 60 ° with respect to the transport direction of the covered electric wire 11A. That is, as shown in FIG. 4A, it is preferable that the angle θ formed between the pair of plasma treaters 31 and the covered electric wire 11A is ± 60 °. In the present embodiment, the distance x between the nozzle tips to which the plasma of each plasma treater 31 is irradiated is 20 mm, and the distance y between each nozzle tip and the coated electric wire 11A is 10 mm.
[0061]
By arranging a pair of plasma treaters 31 in this way, as shown in FIG. 4B, each of the irradiation areas A and B from each plasma treater 31 does not buffer each other, and Along it is almost continuous. As described above, by providing the irradiation regions A and B substantially continuously, a non-irradiation region is not formed between the irradiation regions, and it is effective to make the surface state of the insulator layer uneven. And the plasma processing can be efficiently performed along the covered electric wire 11A.
[0062]
In addition, if two plasma treaters 31 are arranged as one set, for example, as shown in FIG. 5, two sets are provided at different positions in the circumferential direction of the covered electric wire 11A and different positions in the transport direction. Is also good. Of course, three or more sets may be provided. Thereby, the plasma treatment can be performed more efficiently over the entire circumference of the insulator layer surface.
[0063]
On the other hand, the arrangement of the inkjet print head 33 is not particularly limited as long as it can be dried for at least about 1 second after printing. For example, as shown in FIG. 6, a rotary encoder 32 is provided after the second cooling bath 17. The inkjet print head 33 may be arranged between the horizontal guide 18 and the vertical guide 19.
[0064]
Here, as described below, the arrangement of a pair of plasma treaters capable of increasing the speed of the surface treatment of the insulator layer and improving the wettability of the insulator layer with high productivity was studied.
[0065]
Specifically, first, regarding the optimum conditions under which the plasma irradiated from one plasma treater efficiently contacts the insulator layer surface of the coated electric wire, as shown below, the plasma irradiation angle, plasma output, nozzle The distance y between the tip and the coated electric wire and the number of plasma treaters were examined.
[0066]
(Plasma irradiation angle)
The voltage of the plasma was set to 424 V, the current was set to 12.8 A, the distance y between the tip of the nozzle and the insulated wire was set to 10 mm, the transport speed of the insulated wire was set to 10 m / min, and the plasma irradiation angles were set to ± 60 ° and ± 45 °. Under each condition, the surface treatment of the coated electric wire was performed. The contact angle of the coated wire after the surface treatment was set to 0 ° by a meniscus contact angle measuring device using a contact angle measuring device by a meniscus method, and the contact angle (°) was set at 90 ° intervals in the circumferential direction of the coated wire. Was measured. FIG. 7 shows the result. FIG. 7 is a graph showing the relationship between the rotation angle and the contact angle at each irradiation angle of the plasma.
[0067]
As shown in FIG. 7, it was found that the contact angle on the surface of the insulator layer can be made smaller by setting the irradiation angle of the plasma to ± 60 ° than to ± 45 °. That is, it was found that the wettability of the surface of the insulator layer could be improved by setting the plasma irradiation angle of the plasma treater to 60 °.
[0068]
(Plasma output)
The plasma output was changed to voltage 430 V: current 12.7 A, 450 V: 14.4 A, 470 V: 16.5 A, 495 V: 18.5 A, the distance y between the nozzle tip and the coated wire was 10 mm, and the conveying speed of the coated wire. Was set to 10 m / min, and the plasma irradiation angle was set to 60 ° to perform a surface treatment on the coated electric wire. Then, the contact angle after the surface treatment was measured by a contact angle measuring device by a meniscus method by setting the exposed portion of the coated electric wire to 0 ° and measuring the contact angle (°) at 90 ° intervals in the circumferential direction of the coated electric wire. . FIG. 8 shows the result. FIG. 8 is a graph showing the relationship between the rotation angle and the contact angle according to the change in plasma output.
[0069]
As shown in FIG. 8, it is clear that the contact angle can be made relatively small if the plasma output is set to a voltage of 495 V, that is, a large voltage, but the voltage is set to a relatively low voltage of 430 V. It was found that by setting, the contact angle on the surface of the insulator layer can be reduced on average. That is, it was found that even when the plasma output from the plasma treater was set to a low voltage condition, the wettability of the surface of the insulator layer could be improved.
[0070]
(Distance between nozzle tip and sheathed wire)
The output of the plasma was 424 V, the current was 12.8 A, the processing speed was 10 m / min, the irradiation angle of the plasma was 90 °, and the distance y between the tip of the nozzle to be irradiated with the plasma of the plasma treater and the coated electric wire was 5 to 28 mm. The surface treatment of the covered electric wire was performed by changing. Then, the contact angle after the surface treatment (in this case, the receding angle) was measured by a contact angle measuring device using a meniscus method at the portion of the coated electric wire where the plasma was irradiated (rotation angle 0 °). The result is shown in FIG. FIG. 9 is a graph showing the relationship between the interval between the tip of the nozzle and the covered electric wire and the sweepback angle.
[0071]
As shown in FIG. 9, it was found that the receding angle was smallest when the distance y between the nozzle tip and the covered electric wire was about 10 mm. Also, as a result of measuring the receding angle in the case of no plasma treatment, it was about 75.2 °, and when evaluated based on this, the distance y between the nozzle tip and the coated electric wire was set to a range of 9 to 20 mm. By doing so, it was found that the receding angle can be reduced, that is, the wettability of the surface of the insulator layer can be improved.
[0072]
(Number of plasma treaters)
Two plasma treaters were prepared, and each plasma treater was inclined 60 ° in the same direction as the transport direction of the coated electric wires, that is, in parallel with each other, to perform surface treatment on the coated electric wires. Further, for comparison, one plasma treater was similarly inclined at 60 ° in the transport direction of the coated electric wire to perform a surface treatment on the coated electric wire. The surface treatment conditions other than the number of plasma treaters were the same. Then, the contact angle after the surface treatment (here, the receding angle) is set to 0 ° at the portion of the coated electric wire irradiated with plasma by a contact angle measuring device by a meniscus method, and the contact angle is set at 90 ° intervals in the circumferential direction of the coated electric wire. (°) was measured. The result is shown in FIG. FIG. 10 is a graph showing the relationship between the interval between the tip of the nozzle and the coated electric wire and the sweepback angle.
[0073]
As shown in FIG. 10, it was found that the use of two plasma treaters can reduce the receding angle of the insulator layer surface by an average of 2 °. That is, it was found that the wettability of the insulator layer surface can be improved by using a plurality of plasma treaters.
[0074]
(Distance between nozzle tips)
Next, the spacing x between the nozzle tips was examined for optimal conditions under which the plasma irradiated from the two plasma treaters would efficiently contact the insulator layer surface of the coated electric wire. In addition, here, the durability of the marking when the conveying speed of the coated electric wire was increased about four times as compared with the conventional case was also examined.
[0075]
Specifically, the plasma output was set to a voltage of 400 V and a current of 13.8 A, the inclination angle of the plasma treater was set to ± 60 °, the transport speed of the coated wire was set to 40 m / min, and the distance y between the nozzle tip and the coated wire was set to 10 mm. Then, the two plasma treaters are arranged at positions where the tips of the nozzles face each other (see FIG. 4), and the interval x between the tips of the nozzles is set to 0, 10, 20, 40, 80, 120, 160 mm (short interval). , And the surface treatment of the coated electric wire in which the conductor was coated with the insulating layer made of ETFE was performed in the order of Comparative Examples 1 and 2 and Examples 1 to 5). Then, the contact angles (advancing angle and receding angle) after the surface treatment were measured at 90 ° intervals in the circumferential direction of the coated electric wire by a contact angle measuring device by a meniscus method. The results are shown in Table 1 below.
[0076]
[Table 1]
Figure 2004342404
[0077]
As shown in Table 1 above, it was found that Examples 1 to 5 can make the advancing angle and the receding angle relatively small as compared with Comparative Examples 1 and 2. In particular, it was found that the receding angle can be reduced. From this, it was found that the wettability of the insulator layer can be improved by setting the distance x between the nozzle tips to 20 mm or more.
[0078]
(An endurance test)
Two plasma treaters were prepared, and each plasma treater was inclined by 60 ° in the same direction as the transport direction of the coated electric wire, and each plasma treater was shifted by 5 cm in the transport direction and arranged in parallel at opposing positions. The output of the plasma was set to 13.8 A at a voltage of 400 V, the inclination angle of the plasma treater was set to ± 60 °, and the distance y between the tip of the nozzle and the coated electric wire was set to 10 mm. Then, the transport speed of the coated electric wire was changed to 3.5 m / min (Comparative Example 3), 10.5 m / (Comparative Example 4), and 40 m / min (Comparative Example 5), and the surface treatment of the coated electric wire was performed. did. Then, the durability of a print marked by the ink jet print head 33 on the surface of the insulator layer subjected to the surface treatment under the conditions of Examples 1 to 5 and Comparative Examples 1 to 5 was evaluated by a peel test. The results are shown in Table 2 below.
[0079]
In the peel test, a cellophane tape was strongly adhered on the print with a finger pad, peeled instantaneously in the direction of 45 ° from the surface to be pasted. △, all transferred were evaluated as ×.
[0080]
[Table 2]
Figure 2004342404
[0081]
As shown in Table 2 above, in Examples 1 to 5, in the peel test, the print did not transfer to the cellophane tape and remained on the surface of the insulator layer of the covered electric wire. From this, it is clear that the wettability of the insulator layer is improved and the adhesion between the surface of the insulator layer and the print can be improved.
[0082]
Examples 1 to 5 were equivalent to Comparative Examples 3 and 4, that is, the transport speed was 3.5 m / min and 10.5 m / min, even when the transport speed of the insulated wire was set to 40 m / min. It was found that the same durability as in the case, that is, sufficient adhesion between the surface of the insulator layer and the print was obtained. In Comparative Example 5, all the prints were transferred to the cellophane tape. This is probably because the transport speed of the coated electric wire was too high and the surface of the insulator layer could not be effectively plasma-treated.
[0083]
From these results, by disposing two plasma treaters as in Examples 1 to 5, even if the transport speed of the coated electric wire is set to a relatively high speed of 40 m / min, the distance between the surface of the insulator layer and the print can be reduced. It became clear that sufficient adhesion could be ensured.
[0084]
In Comparative Examples 1 and 2, the printing was partially transferred to the cellophane tape, but not all. This is presumably because the distance x between the nozzle tips of each plasma treater was too short, so that the plasma irradiation region was buffered and the surface of the insulator layer could not be effectively improved. For Comparative Examples 1 and 2, conditions other than the distance x between the nozzle tips were optimized in the same manner as in Examples 1 to 5, so that the adhesion between the surface of the insulator layer and the print could be secured to some extent. It is considered that all the prints did not transfer to the cellophane tape.
[0085]
(Other embodiments)
The embodiment of the present invention has been described above, but the present invention is, of course, not limited to the above embodiment.
[0086]
For example, in the first embodiment described above, the coated electric wire 1 in which the conductor 2 is provided with the insulator layer 3 is described as an example. However, the present invention is not limited to this, and as shown in FIG. The surface treatment method of the present invention may be applied to the manufacture of shielded cables 40 and 40A in which metal plating is provided as a shield 44. FIG. 11 is a sectional view of a shielded cable according to another embodiment. Specifically, as shown in FIG. 11A, the shielded cable 40 is provided with a shield 44 on a covered electric wire 43 in which an insulator layer 42 is provided on a single conductor 41, and is made of ETFE on the shield 44. The outer coating layer 45 is applied to make the outer diameter about 0.4 mm. The insulated wire 43 is made of an in-situ chromium fiber reinforced alloy (chromium content 10%) and has an outer diameter of 0.1 mm (cross-sectional area of 0.008 mm). 2 2), the conductor 41 is provided with an insulator layer 42. The shield 44 is obtained by applying atmospheric pressure plasma treatment to the surface of the insulator layer 42 and then forming a 2 μm thick metal plating made of silver by electroless plating. As shown in FIG. 11B, the outer diameter of the in-situ chromium fiber reinforced copper alloy is 0.08 mm (the cross-sectional area is 0.005 mm). 2 The present invention is applied to a shielded cable 40A in which a shield 44 is provided on the outer periphery of an insulator layer 42 of a covered electric wire 43A having a conductor 41A having a multiplicity of wires, and an outer covering layer 45 is similarly provided on the outer periphery of the shield 44. May be applied.
[0087]
【The invention's effect】
As described above, according to the present invention, the insulated wire is arranged at a predetermined side of the insulated wire at a predetermined interval along the longitudinal direction of the insulated wire and in a direction different from the transport direction of the insulated wire and Since the surface treatment of the coated electric wire is performed by irradiating plasma from at least one pair of atmospheric pressure plasma nozzles arranged so that the irradiation direction is inclined by a predetermined amount in the direction opposite to each other, the surface treatment of the insulator layer is performed at a high speed. And the wettability of the insulator layer can be improved with high productivity.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a covered electric wire according to Embodiment 1 of the present invention.
FIG. 2 is a view schematically showing a manufacturing process of the covered electric wire according to the first embodiment of the present invention.
FIG. 3 is a diagram schematically illustrating another manufacturing process of the coated electric wire according to the first embodiment of the present invention.
FIG. 4 is a diagram illustrating an example of an arrangement of a plasma treater according to the first embodiment of the present invention.
FIG. 5 is a view showing another arrangement example of the plasma treater according to the first embodiment of the present invention.
FIG. 6 is a diagram schematically illustrating another manufacturing process of the coated electric wire according to the first embodiment of the present invention.
FIG. 7 is a graph showing a relationship between a rotation angle and a contact angle according to a change in a plasma irradiation angle according to the first embodiment of the present invention.
FIG. 8 is a graph showing a relationship between a rotation angle and a contact angle according to a change in plasma output value according to the first embodiment of the present invention.
FIG. 9 is a graph showing a relationship between a clearance between a nozzle tip and a covered electric wire and a receding angle according to the first embodiment of the present invention.
FIG. 10 is a graph showing a relationship between a clearance between a nozzle tip and a covered electric wire and a receding angle according to the first embodiment of the present invention.
FIG. 11 is a sectional view of a shielded cable according to another embodiment of the present invention.
[Explanation of symbols]
1 Insulated wire
2 conductor
3 Insulator layer
11 conductor
11A Insulated wire
31 Plasma Treator
33 inkjet print head

Claims (9)

導体の周囲に絶縁体層を有する被覆電線の表面処理方法において、前記被覆電線の所定の側方に当該被覆電線の長手方向に沿って所定間隔を置いて配置されると共に当該被覆電線の搬送方向に対して異なる方向で且つプラズマの照射方向を相対向する方向に所定量傾斜させて配置された少なくとも一対の大気圧プラズマノズルからプラズマを照射することにより表面処理を行うことを特徴とする被覆電線の表面処理方法。In the surface treatment method for a covered electric wire having an insulator layer around a conductor, the coated electric wire is disposed at a predetermined side of the covered electric wire at a predetermined interval along a longitudinal direction of the covered electric wire, and a conveying direction of the covered electric wire. Characterized in that a surface treatment is performed by irradiating plasma from at least one pair of atmospheric pressure plasma nozzles arranged in a different direction with respect to the plasma irradiation direction and inclined at a predetermined amount in a direction opposite to each other. Surface treatment method. 請求項1において、前記大気圧プラズマノズルが、プラズマトリーターのノズルであることを特徴とする被覆電線の表面処理方法。2. The method according to claim 1, wherein the atmospheric pressure plasma nozzle is a nozzle of a plasma treater. 請求項1又は2において、前記プラズマの照射を、前記被覆電線の搬送方向に対して50〜70°傾斜した方向から行うことを特徴とする被覆電線の表面処理方法。3. The method according to claim 1, wherein the plasma irradiation is performed from a direction inclined by 50 to 70 [deg.] With respect to a transport direction of the coated electric wire. 請求項3において、前記一対の大気圧プラズマノズルの先端同士の間隔が20mm以上であることを特徴とする被覆電線の表面処理方法。4. The method according to claim 3, wherein an interval between tips of the pair of atmospheric pressure plasma nozzles is 20 mm or more. 請求項3又は4において、前記大気圧プラズマノズルの先端と前記被覆電線との間隔が9〜20mmの範囲にあることを特徴とする被覆電線の表面処理方法。5. The method according to claim 3, wherein a distance between a tip of the atmospheric pressure plasma nozzle and the covered wire is in a range of 9 to 20 mm. 請求項1〜5の何れかにおいて、前記一対の大気圧プラズマノズルを前記被覆電線に沿った異なる位置で且つ前記所定の側方とは異なる側方に複数配置して当該被覆電線の周囲の複数方向からプラズマの照射を行うことを特徴とする被覆電線の表面処理方法。The plurality of pairs of atmospheric pressure plasma nozzles according to any one of claims 1 to 5, wherein a plurality of the pair of atmospheric pressure plasma nozzles are arranged at different positions along the insulated wire and on a side different from the predetermined side. A surface treatment method for a coated electric wire, comprising irradiating plasma from a direction. 請求項1〜6の何れかにおいて、前記表面処理の後、濡れ性を向上させる対象の溶媒中に浸漬することを特徴とする被覆電線の表面処理方法。The method according to any one of claims 1 to 6, wherein after the surface treatment, the coated wire is immersed in a solvent to be improved in wettability. 請求項1〜7の何れかの表面処理方法により表面処理を行う表面処理工程と、前記表面処理を施した後に、表面処理された被覆電線の絶縁体層表面にインクジェット印字手段を用いてマーキングを行う工程を具備することを特徴とする被覆電線の製造方法。A surface treatment step of performing a surface treatment by the surface treatment method according to any one of claims 1 to 7, and after performing the surface treatment, marking is performed on the surface of the insulator layer of the surface-treated covered electric wire using an inkjet printing unit. A method for manufacturing a covered electric wire, comprising a step of performing. 請求項1〜7の何れかの表面処理方法により表面処理を行う表面処理工程と、前記表面処理を施した後、表面処理された被覆電線の絶縁体層表面に金属メッキ層を形成する工程を具備することを特徴とする被覆電線の製造方法。A surface treatment step of performing a surface treatment by the surface treatment method according to any one of claims 1 to 7, and a step of forming a metal plating layer on the surface of the insulator layer of the surface-treated covered electric wire after performing the surface treatment. A method for manufacturing a covered electric wire, comprising:
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011091021A (en) * 2009-09-24 2011-05-06 Hitachi Cable Ltd Cable-attached resin mold structure
JP2012170631A (en) * 2011-02-22 2012-09-10 Fujifilm Corp Apparatus and method for manufacturing linear member fitted with wiring
JP2019160484A (en) * 2018-03-09 2019-09-19 日立金属株式会社 Production method and device of cable for signal transmission

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011091021A (en) * 2009-09-24 2011-05-06 Hitachi Cable Ltd Cable-attached resin mold structure
JP2012170631A (en) * 2011-02-22 2012-09-10 Fujifilm Corp Apparatus and method for manufacturing linear member fitted with wiring
JP2019160484A (en) * 2018-03-09 2019-09-19 日立金属株式会社 Production method and device of cable for signal transmission

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