JP7211104B2 - 線状部材及びその製造方法 - Google Patents
線状部材及びその製造方法 Download PDFInfo
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- JP7211104B2 JP7211104B2 JP2019009935A JP2019009935A JP7211104B2 JP 7211104 B2 JP7211104 B2 JP 7211104B2 JP 2019009935 A JP2019009935 A JP 2019009935A JP 2019009935 A JP2019009935 A JP 2019009935A JP 7211104 B2 JP7211104 B2 JP 7211104B2
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Description
(ケーブルの構造)
図1は、実施の形態に係る線状部材としてのケーブル1の斜視図である。ケーブル1は、導体10と、導体10の周囲を被覆する線状の絶縁体11と、絶縁体11の表面(外周面)を直接被覆するシールド12と、を備える。ケーブル1の直径は、例えば、500~1500μmである。
絶縁体11の材料は、シールド12を形成するために用いられる触媒液やめっき液に触れても溶けない材料であれば、特に限定されないが、典型的には、ポリエチレン又はフッ素樹脂である。特に、ポリエチレンは入手性がよく、また、耐電子線性能が高いため、樹脂繊維10の材料として好ましい。フッ素樹脂としては、具体的には、ポリテトラフルオロエチレン(PTFE)、パーフロロアルコキシ(PFA)、パーフルオロエチレンプロペンコポリマー(FEP)、エチレン・テトラフルオロエチレンコポリマー(ETFE)、テトラフルオロエチレン-パーフルオロジオキソールコポリマー(TFE/PDD)、ポリフッ化ビニリデン(PVDF)、ポリクロロトリフルオロエチレン(PCTFE)、エチレン-クロロトリフロオロエチレンコポリマー(ECTFE)、ポリフッ化ビニル(PVF)などを用いることができる。
以下、本実施の形態に係るケーブル1の製造方法の一例について説明する。
電解めっき液162としての、硫酸銅めっき液の組成の例を表1に示す。表1中の「塩化ナトリウム、塩酸」は、塩化物の一例である。
電解めっき液162としての、シアン化銅めっき液の組成の例を表2に示す。表2中の「遊離シアン化ナトリウム(遊離シアン化カリウム)」は、シアン化銅と反応せずに浴中に残存したシアン化アルカリである。
上記実施の形態に係るケーブル1によれば、絶縁体11への表面処理として、粗化処理や改質処理を実施することにより、めっき層からなるシールド12と絶縁体11との密着性を向上させ、めっき層の絶縁体からの剥離や、めっき層と絶縁体との間の空隙の形成による伝送特性の低下を抑制することができる。
表面処理後、シールド12の形成前に、絶縁体11の結晶化度をATR測定によって調べた。
図12(a)、(b)は、ドライアイスの噴射圧力を0.6MPaとしてドライアイスブラスト処理を施した、結晶化度Xcが0.65である絶縁体11を備えたケーブル1の外観を示す写真である。図12(b)は、ケーブル1の先端部分周辺を拡大した写真である。図12(b)においては、めっき層であるシールド12の表面に、ケーブル1の長手方向に伸びる筋状の模様が観察できる。この筋状の模様は、絶縁体11を押出成形により形成する際に絶縁体11の表面に生じた筋状の凹凸に起因するものであり、絶縁体11とシールド12の密着性が高く、かつシールド12の厚さが均一であるためにシールド12の表面に表れるものである。
次に、以上説明した実施の形態から把握される技術思想について、実施の形態における符号等を援用して記載する。ただし、以下の記載における各符号等は、特許請求の範囲における構成要素を実施の形態に具体的に示した部材等に限定するものではない。
10 導体
11 絶縁体
12 シールド
Claims (3)
- 表面に凹凸を有する線状の絶縁体と、
前記絶縁体の表面を被覆するめっき層と、
を備え、
前記絶縁体がポリエチレンからなり、
前記凹凸の平均間隔Smが20.0μm以下であり、
前記絶縁体の表面から1μmまでの深さの領域内における、下記の式1で表される結晶化度Xcが0.512以上かつ0.685以下であり、
前記式1におけるIcが、前記絶縁体のフーリエ変換赤外吸収スペクトルにおける結晶質成分の吸収ピーク強度であり、
前記式1におけるIaが、前記絶縁体のフーリエ変換赤外吸収スペクトルにおける非晶質成分の吸収ピーク強度であり、
前記絶縁体の表面のカルボニル基の量が、前記絶縁体にドライアイスの噴射圧力を0.50MPaとしてドライアイスブラスト処理を施した後にコロナ放電暴露して前記結晶化度X c が0.512になるときの量以上、前記絶縁体にドライアイスの噴射圧力を0.35MPaとしてドライアイスブラスト処理を施した後にコロナ放電暴露して前記結晶化度X c が0.512になるときの量以下である、
線状部材。
- 前記絶縁体に周囲を被覆される線状の導体を備え、
前記めっき層がシールドとして機能する、
請求項1に記載の線状部材。 - 線状の絶縁体の表面に粗化処理を施す工程と、
前記線状の絶縁体の表面に改質処理を施す工程と、
前記粗化処理及び前記改質処理の後、前記絶縁体の表面にめっき処理を施してめっき層を形成する工程と、
を含み、
前記絶縁体がポリエチレンからなり、
前記絶縁体の表面の凹凸の平均間隔Smを、前記粗化処理により20.0μm以下にし、
前記粗化処理が、ドライアイスブラスト処理により実施され、
前記改質処理が、コロナ放電暴露により実施され、
前記改質処理により、前記絶縁体の表面から1μmまでの深さの領域内における、下記の式2で表される結晶化度Xcを0.512以上かつ0.685以下の範囲内まで増加させ、
前記式2におけるIcが、前記絶縁体のフーリエ変換赤外吸収スペクトルにおける結晶質成分の吸収ピーク強度であり、
前記式2におけるIaが、前記絶縁体のフーリエ変換赤外吸収スペクトルにおける非晶質成分の吸収ピーク強度である、
線状部材の製造方法。
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