JP2011161651A - 樹脂部材のレーザー接合方法および樹脂部材のレーザー接合体 - Google Patents
樹脂部材のレーザー接合方法および樹脂部材のレーザー接合体 Download PDFInfo
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Abstract
【解決手段】 本発明は、2以上の樹脂部材を接触させ、その接触面の近傍に配置された光吸収剤にレーザー光を照射して樹脂部材を溶着させて接合する樹脂部材のレーザー接合方法であって、前記樹脂部材の少なくとも何れか1つが、300℃以上のガラス転移点又は融点を有する熱可塑性樹脂であり、前記光吸収剤が、示差熱天秤を用いて350℃まで加熱して測定された重量減少量が40%未満であることを特徴とする樹脂部材のレーザー接合方法を提供する。
【選択図】 図1
Description
図1は、本発明の第一実施形態に係る樹脂部材のレーザー接合方法を示す側面図であり、符号10a、10bがシート状の樹脂部材を表しており、符合50がレーザー光を表している。また、図2は、該第一実施形態のレーザー接合方法により接合された樹脂部材の接合体を示す側面図である。
ただし、レーザー光の照射側に配置される樹脂部材については、樹脂部材全体として30%以上の光透過率を有することが好ましく、50%以上の光透過率を有することが更に好ましい。
このような物性の光吸収剤を用いることにより、樹脂の溶融温度に到達するまで光吸収剤の分解や気化が抑制され、レーザー光によって供給される熱量がロスなく速やかに光吸収剤の温度上昇に使用されることとなる。
また、前記光吸収剤20としては、さらに400℃まで加熱して測定された重量減少量が60%以下となるものを採用することが好ましく、斯かる光吸収剤を採用することにより、レーザー光の照射によって加熱された光吸収剤が400℃を超えても十分に残存し、その残存する光吸収剤を熱媒体として作用させることが可能となる。
これらの光吸収剤の具体例としては、山本化成社から、「YKR」の商品名で市販されている光吸収剤を好適に用いることができ、また、オリエント化学工業社製の「eBIND」の商品名で市販されている光吸収剤(メチン系の油溶性染料を含む着色剤を樹脂に配合して製造されたインクタイプ)を好適に用いることができる。
これらの内でも、安価で且つ面内均一な強度のレーザー光が得られ易い点においては、半導体レーザーやファイバーレーザーが好ましい。
また、レーザーの出力、パワー密度、スポットサイズ、照射回数、走査速度などは、樹脂材料の種類、厚み、光吸収率などから適宜選択され得る。
図3に示すように、本第二実施形態は、接合対象となるシート状の樹脂部材10a、10bの各々の端部を同一平面上で突き合わせるように配置し、これらの樹脂部材10aおよび10bの両方に重なるように別の樹脂部材(第三の樹脂部材)10cを重ね合わせ、この第三の樹脂部材10cと前記樹脂部材10a、10bの接触面をそれぞれ溶融させて接着を行うものである。具体的には、樹脂部材10aと第三の樹脂部材10cとの間、および樹脂部材10aと第三の樹脂部材10cとの間に介在するように光吸収剤20を配置し、それらの光吸収剤20にレーザー光50を照射することによってそれぞれの接合面における樹脂部材を溶着させ、樹脂部材10cを介して樹脂部材10aと樹脂部材10bを接合させるものである。
図5に示すように、本第三実施形態は、接合対象となるシート状の樹脂部材10a、10bの各々の端部を同一平面上で突き合わせるように配置し、これらの樹脂部材10aおよび10bの両方に重なるように発熱媒体11を重ね合わせ、この発熱媒体11から供給される熱によって前記樹脂部材10aと樹脂部材10bとの接触面を溶融させて接着を行い、その後、発熱媒体11を剥離するものである。樹脂部材10a、10bのうち、少なくとも何れか一方は300℃以上のTg又は融点を有する熱可塑性樹脂を備えたものである。
より具体的には、本第三実施形態のレーザー接合方法は、樹脂部材10aと発熱媒体11との間、および樹脂部材10aと発熱媒体11との間に介在するように光吸収剤20を配置し、その光吸収剤20にレーザー光50を照射することによって樹脂部材10aと樹脂部材10bの接合面における樹脂部材を溶着させ、樹脂部材10aと樹脂部材10bを接合させるものである。発熱媒体11は、その表面に光吸収剤20が塗布されており、照射されたレーザー光のエネルギーを光吸収剤20により熱エネルギーに換えて樹脂部材へと伝達するものであるため、樹脂部材どうしが溶着した後は、剥離除去する。該発熱媒体11は、図5に示すように、樹脂部材を表裏両面から挟むように配置してもよく、また、表裏何れか片面のみに配置するようにしてもよい。
実施例1において用いた使用材料は以下の通りである。
<使用材料>
・樹脂部材1 材質 全芳香族ポリアミド(デュポン社製、商品名「ノーメックス」 融点410℃)
厚み 80μm
形状 10mm×50mm
・樹脂部材2 樹脂部材1と同じ
・光吸収剤 山本化成社製、商品名「YKR」(示差熱天秤を用いて350℃まで加熱して測定された重量減少量は30%)
・レーザー 波長 940nm
出力 50W
スポット 2mmφ
・加圧部材 材質 溶融石英ガラス
厚み 10mm
・ステージ シリコンラバー(3mm厚)上にポリイミド樹脂(デュポン社製、商品名「カプトン」 125μm厚)を積置したもの
示差熱天秤(Thermo plus、Rigaku社製、TG8120シリーズ高温型)を用いて重量減少量を測定した。測定条件は以下のとおりとした。
昇温レート 10℃/min
測定雰囲気 N2
測定温度 30〜500℃
保持時間 0min
樹脂部材1の端部に幅10mm×長さ10mmの範囲で光吸収剤を塗布して乾燥させ、厚み100nmの光吸収剤の塗布層を形成した。この光吸収剤の塗布層は、波長940nmのレーザー光の透過率が40%であった。該塗布層が形成された樹脂部材1をステージ上に載置し、光吸収剤の塗布層を覆うように樹脂部材2を重ね合わせ、その上から加圧部材で50kgf/cm2の圧力で押圧した。該加圧部材を押圧した状態で、上記条件のレーザー光を速度50mm/sで1ライン走査照射し、樹脂部材のレーザー接合を行った。その結果、樹脂部材どうしが高い剥離強度で接合されていることが確認された。
<使用材料>
樹脂部材1および2に代えて、下記の構成よりなる樹脂部材3および4を用いたことを除き、他は実施例1と同様にしてレーザー接合テストを実施した。
・樹脂部材3 ノーメックス−接着剤−PEN−接着剤−ノーメックスの積層シート
ノーメックス 実施例1の樹脂部材1と同じ
接着剤 アクリル系接着剤、25μm厚
PEN ポリエチレンナフタレート、125μm厚
・樹脂部材4 樹脂部材3と同じ
<使用材料>
下記光吸収剤を用いたことを除き、他は実施例1と同様にしてレーザー接合テストを実施した。
・光吸収剤 メチン系の油溶性染料を含む着色剤を樹脂に配合して製造されたインクタイプ(オリエント化学工業社製、商品名「eBIND ink」(示差熱天秤を用いて350℃まで加熱して測定された重量減少量が37%)
実施例3と同じ光吸収剤を用いたことを除き、他は実施例2と同様にしてレーザー接合テストを実施した。
レーザー接合テストの結果、実施例1と同様に、樹脂部材どうしが高い剥離強度で接合されていることが確認された。
<使用材料>
下記光吸収剤を用いたことを除き、他は実施例1と同様の材料を使用した。
・光吸収剤 ジェンテックス社製 商品名「Clearweld LD120C」(示差熱天秤を用いて350℃まで加熱して測定された重量減少量が60%)
比較例1と同じ光吸収剤を用いたことを除き、他は実施例2と同様にしてレーザー接合テストを実施した。
得られた接合体に引張応力を作用させると、比較的弱い力で接合部が剥離してしまい、2つの樹脂部材どうしが十分な接合強度で接合されていなかったことが判明した。
20 光吸収剤
30 ステージ
40 加圧部材
50 レーザー光
Claims (2)
- 2以上の樹脂部材を接触させ、その接触面の近傍に配置された光吸収剤にレーザー光を照射して樹脂部材を溶着させて接合する樹脂部材のレーザー接合方法であって、
前記樹脂部材の少なくとも何れか1つが、300℃以上のガラス転移点又は融点を有する熱可塑性樹脂であり、前記光吸収剤が、示差熱天秤を用いて350℃まで加熱して測定された重量減少量が40%未満であることを特徴とする樹脂部材のレーザー接合方法。
- 2以上の樹脂部材が接触され、その接触面の近傍に配置された光吸収剤にレーザー光が照射されることで樹脂部材どうしが溶着接合されてなる樹脂部材の接合体であって、
前記樹脂部材の少なくとも何れか1つが、300℃以上のガラス転移点又は融点を有する熱可塑性樹脂であり、前記光吸収剤が、示差熱天秤を用いて350℃まで加熱して測定された重量減少量が40%未満であることを特徴とする樹脂部材の接合体。
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2013031964A (ja) * | 2011-08-02 | 2013-02-14 | Nitto Denko Corp | 樹脂部材の接合方法 |
JP2013072682A (ja) * | 2011-09-27 | 2013-04-22 | Toshiba Corp | 放射線検出部材の製造方法及び放射線検出装置 |
ITVR20120109A1 (it) * | 2012-05-31 | 2013-12-01 | Sacmi Verona Spa | Procedimento per la saldatura di porzioni di film in materiale plastico mediante saldatura laser |
JP2013244614A (ja) * | 2012-05-23 | 2013-12-09 | Denso Corp | 複合樹脂成形品及びその製造方法 |
CN109353012A (zh) * | 2018-10-30 | 2019-02-19 | 大族激光科技产业集团股份有限公司 | 激光焊接塑料的方法及塑料制品 |
Citations (1)
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JP2007532349A (ja) * | 2004-04-14 | 2007-11-15 | ビーエーエスエフ アクチェンゲゼルシャフト | レーザー放射線を使用してプラスチック部品を一緒に溶接する方法 |
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JP2007532349A (ja) * | 2004-04-14 | 2007-11-15 | ビーエーエスエフ アクチェンゲゼルシャフト | レーザー放射線を使用してプラスチック部品を一緒に溶接する方法 |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2013031964A (ja) * | 2011-08-02 | 2013-02-14 | Nitto Denko Corp | 樹脂部材の接合方法 |
JP2013072682A (ja) * | 2011-09-27 | 2013-04-22 | Toshiba Corp | 放射線検出部材の製造方法及び放射線検出装置 |
JP2013244614A (ja) * | 2012-05-23 | 2013-12-09 | Denso Corp | 複合樹脂成形品及びその製造方法 |
ITVR20120109A1 (it) * | 2012-05-31 | 2013-12-01 | Sacmi Verona Spa | Procedimento per la saldatura di porzioni di film in materiale plastico mediante saldatura laser |
CN109353012A (zh) * | 2018-10-30 | 2019-02-19 | 大族激光科技产业集团股份有限公司 | 激光焊接塑料的方法及塑料制品 |
CN109353012B (zh) * | 2018-10-30 | 2021-03-30 | 大族激光科技产业集团股份有限公司 | 激光焊接塑料的方法及塑料制品 |
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