JP2004276295A - Method for bonding thermoplastic transparent resin materials using laser - Google Patents

Method for bonding thermoplastic transparent resin materials using laser Download PDF

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Publication number
JP2004276295A
JP2004276295A JP2003067691A JP2003067691A JP2004276295A JP 2004276295 A JP2004276295 A JP 2004276295A JP 2003067691 A JP2003067691 A JP 2003067691A JP 2003067691 A JP2003067691 A JP 2003067691A JP 2004276295 A JP2004276295 A JP 2004276295A
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Japan
Prior art keywords
transparent resin
resin materials
laser
resin material
infrared
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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JP2003067691A
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Japanese (ja)
Inventor
Yasuo Kurosaki
晏夫 黒崎
Kimitoshi Sato
公俊 佐藤
Naohiko Mushiaki
尚彦 虫明
Katsuo Suzaki
勝夫 須崎
Akio Kubo
明郎 久保
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Sumika Color Co Ltd
Kantum Electronics Co Ltd
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Sumika Color Co Ltd
Kantum Electronics Co Ltd
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Application filed by Sumika Color Co Ltd, Kantum Electronics Co Ltd filed Critical Sumika Color Co Ltd
Priority to JP2003067691A priority Critical patent/JP2004276295A/en
Publication of JP2004276295A publication Critical patent/JP2004276295A/en
Withdrawn legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1677—Laser beams making use of an absorber or impact modifier
    • B29C65/1683—Laser beams making use of an absorber or impact modifier coated on the article
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1629—Laser beams characterised by the way of heating the interface
    • B29C65/1635—Laser beams characterised by the way of heating the interface at least passing through one of the parts to be joined, i.e. laser transmission welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1629—Laser beams characterised by the way of heating the interface
    • B29C65/1654—Laser beams characterised by the way of heating the interface scanning at least one of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1677—Laser beams making use of an absorber or impact modifier
    • B29C65/168—Laser beams making use of an absorber or impact modifier placed at the interface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/733—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the optical properties of the material of the parts to be joined, e.g. fluorescence, phosphorescence
    • B29C66/7336—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the optical properties of the material of the parts to be joined, e.g. fluorescence, phosphorescence at least one of the parts to be joined being opaque, transparent or translucent to visible light
    • B29C66/73365—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the optical properties of the material of the parts to be joined, e.g. fluorescence, phosphorescence at least one of the parts to be joined being opaque, transparent or translucent to visible light at least one of the parts to be joined being transparent or translucent to visible light
    • B29C66/73366—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the optical properties of the material of the parts to be joined, e.g. fluorescence, phosphorescence at least one of the parts to be joined being opaque, transparent or translucent to visible light at least one of the parts to be joined being transparent or translucent to visible light both parts to be joined being transparent or translucent to visible light
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1603—Laser beams characterised by the type of electromagnetic radiation
    • B29C65/1612—Infrared [IR] radiation, e.g. by infrared lasers
    • B29C65/1616—Near infrared radiation [NIR], e.g. by YAG lasers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/45—Joining of substantially the whole surface of the articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2101/00—Use of unspecified macromolecular compounds as moulding material
    • B29K2101/12—Thermoplastic materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0018—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular optical properties, e.g. fluorescent or phosphorescent
    • B29K2995/0026—Transparent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0018—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular optical properties, e.g. fluorescent or phosphorescent
    • B29K2995/0026—Transparent
    • B29K2995/0027—Transparent for light outside the visible spectrum
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0037—Other properties
    • B29K2995/0072—Roughness, e.g. anti-slip

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Optics & Photonics (AREA)
  • Health & Medical Sciences (AREA)
  • Electromagnetism (AREA)
  • Toxicology (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To bond thermoplastic transparent resin materials using a laser so as to bring about a high bonding effect without requiring working labor and suffering influence by the uneven states provided to the bonding surfaces of the transparent resin materials. <P>SOLUTION: An infrared absorber 5 is applied to the bonding surfaces of two transparent resin materials 1 and 3, which are adjacent to each other so as to oppose the surfaces of both materials mutually, at least partially or preferably entirely to superpose the opposed surfaces coated with the infrared absorber 5 of a plurality of the transparent resin materials one upon another. Then, a laser beam is applied to the exposed surface of the transparent resin material on the outermost side of the superposed structure. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【産業上の利用分野】
この発明は熱可塑性透明樹脂材料のレーザー接合方法に関するものであり、より詳しくは接面重合した複数の熱可塑性透明樹脂材料をレーザー光照射により相互に接合させる方法の改良に関するものである。
【０００２】
【従来技術】
上記のような熱可塑性透明樹脂材料のレーザー接合方法としては、本出願人の出願になる特願２００１−３８９５５１号に開示されたものがある。
【０００３】
該レーザー接合方法においては、対面隣接する透明樹脂材料間にレーザー光に対して吸収性で非常に薄い透明フィルムを介在させた状態で、レーザー光を照射することにより透明樹脂材料をフィルムの溶着により接合させている。
【０００４】
【発明が解決しようとする課題】
しかしこの接合方法の場合には、透明樹脂材料の形状に合せてフィルムを切断して、透明樹脂材料の接合面に添着させる必要があるので、作業的に手間が掛かる。しかも接面重合する透明樹脂材料間にフィルムを介在させるので、透明樹脂材料の接合面にいささかでも凹凸があるとフィルムと透明樹脂材料の接合面に空気が点在することがあり、接合効果が損なわれるという問題がある。
【０００５】
かかる従来技術の現状に鑑みてこの発明の目的は、熱可塑性透明樹脂材料のレーザー接合方法において、作業的な手間を要せず、しかも透明樹脂材料の接合面の凹凸状態に影響されることなく、高い接合効果を奏することにある。
【０００６】
【課題を解決するための手段】
このためこの発明の熱可塑性透明樹脂材料のレーザー接合方法においては、対面隣接する透明樹脂材料の接合面に赤外線吸収剤を少なくとも部分的に塗布した状態で複数の透明樹脂材料を接面重合し、外側の透明樹脂材料の露出面にレーザー光を照射することを要旨とする。
【０００７】
【作用】
上記の構成で接面重合された透明樹脂材料に赤外線レーザー光を照射すると、レーザー光による輻射エネルギーを透明樹脂材料間に介在する赤外線吸収剤が吸収して発熱し、これにより透明樹脂材料が相互に溶着接合する。
【０００８】
【実施例】
以下図面に示す２個の透明樹脂材料を接面重合した被処理ユニットの実施例によりこの発明を詳細に説明する。
【０００９】
図示のように発明の被処理ユニットは上下に接面重合された２個の透明樹脂材料１、３の少なくとも一方の接合面に赤外線吸収剤５を塗布により介在させた構成である。これらの透明樹脂材料１、３は赤外線レーザー光に対して非吸収性である。赤外線吸収剤５は微量の赤外線吸収色素をベヒクルと共に水に分散させて形成したものであり、透明であるが赤外線レーザー光に対しては吸収性を呈するものである。
【００１０】
接合処理に際しては、上側の透明樹脂材料１の上面に赤外線レーザー光を照射する。照射されたレーザー光は吸収されることなく上側の透明樹脂材料１を透過して赤外線吸収剤５に到達し、この赤外線吸収剤５がレーザー光のエネルギーを吸収して発熱し、近傍の透明樹脂材料部分を溶着により接合させる。
【００１１】
これらの透明樹脂材料１、３としては赤外線レーザー光に対して非吸収性を呈する熱可塑性樹脂ならば、いかなる材料でも採用できる。
【００１２】
赤外線吸収剤分散系の組成の一例を挙げると、赤外線吸収剤を２０．０（重量比：以下同じ）、高分子分散剤を５．０、界面活性剤を１．０（＝低分子分散剤：ノニオン、アニオン系）、消泡剤を０．１、防腐剤を０．１、水を７３．８含んだものが使われる。
【００１３】
溶媒としては水でも溶剤でもよい。また分散装置としては適宜従来公知のものを使用できる。
【００１４】
赤外線レーザー光の光源としては、半導体レーザー（発振波長８００〜９６０ｎｍ）およびＹＡＧレーザー（発振波長１０９６ｎｍ位）などの透明樹脂を透過し易い近赤外線レーザーを用いるのが望ましい。特に半導体レーザーは、光源が比較的安価で構造も簡単であり、動力変換効率も他のタイプのレーザー光源に比較して高い、という利点を有している。
【００１５】
【実験例】
透明樹脂部材としては、厚さ１ｍｍのものを２個接面重合させた。赤外線吸収剤分散系としては、フタロシアニン系有機顔料の０．２％水溶液を用いた。
【００１６】
接合に際しては、透明樹脂部材の初期押え荷重が０．２［ＭＰａ］で、部材の送り速度が３０［ｍｍ／ｓ］で、レーザービーム直径が１［ｍｍ］で、部材の初期温度が２７［℃］であった。
【００１７】
実験の結果を図２に示す。図中横軸はレーザー光照射強度［Ｗ／ｍｍ２］であり、縦軸は引張強度［ＭＰａ］である。
【００１８】
なお以上の記載においては、２個の透明樹脂材料間に赤外線吸収剤を塗布介在させる実施例を挙げたが、この発明はこれに限定されるものではない。すなわち複数の透明樹脂材料を接面重合して、各対面隣接する透明樹脂材料間に赤外線吸収剤を塗布介在させてこの発明を実施することも可能である。
【００１９】
【発明の効果】
この発明によれば透明樹脂材料間に介在させた赤外線吸収剤のエネルギー吸収による発熱で透明樹脂材料を溶着により接合しているので、接合が確実に行われる。しかも赤外線吸収剤を塗布により添着しているので、フィルムのように切断したり張り付けたりする手間も要しない。さらに赤外線吸収剤は液状で変形自由であるが故に、たとえ透明樹脂材料の接合面が凹凸状態であっても接合面に完全に沿うので、透明樹脂材料の接合間に空気が点在することもなくなり、接合効果が大きく向上する。
【図面の簡単な説明】
【図１】この発明における被処理ユニットの一実施例を示す斜視図である。
【図２】実験例におけるレーザー光照射強度と引張強度との関係を示すグラフである。
【符号の説明】
１、３： 透明樹脂材料
５ ： 赤外線吸収剤[0001]
[Industrial applications]
The present invention relates to a method for laser joining thermoplastic transparent resin materials, and more particularly, to an improvement in a method for joining a plurality of thermoplastic transparent resin materials that have been polymerized in contact with each other by laser beam irradiation.
[0002]
[Prior art]
As a laser joining method of the thermoplastic transparent resin material as described above, there is a method disclosed in Japanese Patent Application No. 2001-389551 filed by the present applicant.
[0003]
In the laser bonding method, the transparent resin material is welded by irradiating the laser light in a state where a very thin transparent film that is absorptive to the laser light is interposed between the adjacent transparent resin materials. Are joined.
[0004]
[Problems to be solved by the invention]
However, in the case of this joining method, it is necessary to cut the film in accordance with the shape of the transparent resin material and to attach the film to the joining surface of the transparent resin material, which is labor-intensive. Moreover, since the film is interposed between the transparent resin materials that are polymerized on the contact surface, if there is any unevenness on the joint surface of the transparent resin material, air may be scattered on the joint surface between the film and the transparent resin material, and the joining effect may be reduced. There is a problem of being damaged.
[0005]
In view of the current state of the prior art, an object of the present invention is to provide a laser bonding method for a thermoplastic transparent resin material, which does not require any labor and is not affected by the unevenness of the bonding surface of the transparent resin material. To achieve a high bonding effect.
[0006]
[Means for Solving the Problems]
For this reason, in the method of laser bonding thermoplastic transparent resin material of the present invention, a plurality of transparent resin materials are surface-polymerized in a state where an infrared absorber is applied at least partially to the bonding surface of the transparent resin material adjacent to each other, The gist is to irradiate a laser beam to the exposed surface of the outer transparent resin material.
[0007]
[Action]
When an infrared laser beam is applied to the transparent resin material that has been surface-polymerized in the above-described configuration, the radiant energy of the laser beam is absorbed by the infrared absorbing agent interposed between the transparent resin materials and heat is generated. To be welded.
[0008]
【Example】
Hereinafter, the present invention will be described in detail with reference to an embodiment of a unit to be treated in which two transparent resin materials are superposed on each other as shown in the drawings.
[0009]
As shown in the drawing, the unit to be treated according to the present invention has a configuration in which an infrared absorbing agent 5 is interposed by coating at least one of two transparent resin materials 1 and 3 which are superposed on the upper and lower surfaces. These transparent resin materials 1 and 3 are non-absorptive to infrared laser light. The infrared absorbing agent 5 is formed by dispersing a trace amount of an infrared absorbing dye in water together with a vehicle, and is transparent but exhibits absorptivity to infrared laser light.
[0010]
During the bonding process, the upper surface of the upper transparent resin material 1 is irradiated with infrared laser light. The irradiated laser light passes through the upper transparent resin material 1 without being absorbed and reaches the infrared absorbent 5, which absorbs the energy of the laser light and generates heat. The material parts are joined by welding.
[0011]
As these transparent resin materials 1 and 3, any material can be adopted as long as it is a thermoplastic resin exhibiting non-absorptivity to infrared laser light.
[0012]
As an example of the composition of the infrared absorbent dispersion system, the infrared absorbent is 20.0 (weight ratio: the same applies hereinafter), the polymer dispersant is 5.0, and the surfactant is 1.0 (= low molecular dispersant). : Nonionic, anionic), 0.1 defoamer, 0.1 preservative, and 73.8 water.
[0013]
The solvent may be water or a solvent. As the dispersing device, a conventionally known dispersing device can be appropriately used.
[0014]
As a light source of the infrared laser light, it is desirable to use a near-infrared laser which easily transmits a transparent resin such as a semiconductor laser (oscillation wavelength of 800 to 960 nm) and a YAG laser (oscillation wavelength of about 1096 nm). In particular, semiconductor lasers have the advantage that the light source is relatively inexpensive, the structure is simple, and the power conversion efficiency is higher than other types of laser light sources.
[0015]
[Experimental example]
Two transparent resin members having a thickness of 1 mm were superposed on the surface in contact with each other. As the infrared absorbing agent dispersion system, a 0.2% aqueous solution of a phthalocyanine-based organic pigment was used.
[0016]
At the time of joining, the initial pressing load of the transparent resin member is 0.2 [MPa], the feed speed of the member is 30 [mm / s], the laser beam diameter is 1 [mm], and the initial temperature of the member is 27 [mm]. ° C].
[0017]
FIG. 2 shows the results of the experiment. In the figure, the horizontal axis is the laser beam irradiation intensity [W / mm 2 ], and the vertical axis is the tensile strength [MPa].
[0018]
In the above description, the embodiment in which the infrared absorbing agent is applied between two transparent resin materials has been described, but the present invention is not limited to this. That is, the present invention can be carried out by superposing a plurality of transparent resin materials in contact surface and applying and interposing an infrared absorbent between the transparent resin materials adjacent to each other.
[0019]
【The invention's effect】
According to the present invention, since the transparent resin materials are joined by welding due to the heat generated by the energy absorption of the infrared absorber interposed between the transparent resin materials, the joining is reliably performed. Moreover, since the infrared absorbing agent is attached by coating, there is no need to cut or paste like a film. In addition, since the infrared absorber is liquid and free to deform, even if the joining surface of the transparent resin material is uneven, it completely follows the joining surface, so that air may be scattered between the joining of the transparent resin materials. And the joining effect is greatly improved.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an embodiment of a unit to be processed in the present invention.
FIG. 2 is a graph showing a relationship between laser light irradiation intensity and tensile strength in an experimental example.
[Explanation of symbols]
1, 3: transparent resin material 5: infrared absorber

Claims (1)

レーザー光に対して非吸収性で熱可塑性の透明樹脂材料の接合面に微量の赤外線吸収色素をベヒクルと共に水または溶剤に分散させて形成した赤外線吸収剤を少なくとも部分的に存在させた状態で複数の透明樹脂材料を接面重合し、外側の透明樹脂材料の露出面にレーザー光を照射することを特徴とする熱可塑性透明樹脂材料のレーザー接合方法。In a state where a small amount of an infrared absorbing dye is dispersed in water or a solvent together with a vehicle at least partially on the bonding surface of a thermoplastic transparent resin material that is non-absorbing to laser light and A method of laser-welding a thermoplastic transparent resin material, characterized in that the transparent resin material is polymerized in contact surface and the exposed surface of the outer transparent resin material is irradiated with laser light.
JP2003067691A 2003-03-13 2003-03-13 Method for bonding thermoplastic transparent resin materials using laser Withdrawn JP2004276295A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007231088A (en) * 2006-02-28 2007-09-13 Denso Corp Light-absorbing inclusion and adhesive containing the same
JP2012030560A (en) * 2010-08-02 2012-02-16 Hayakawa Rubber Co Ltd Joining method using laser beam, and laser joining agent used for the joining method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007231088A (en) * 2006-02-28 2007-09-13 Denso Corp Light-absorbing inclusion and adhesive containing the same
JP2012030560A (en) * 2010-08-02 2012-02-16 Hayakawa Rubber Co Ltd Joining method using laser beam, and laser joining agent used for the joining method

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