Secondary Operations: Adhesive Bonding

蒸発してしまう溶剤とは違い、接着剤層は組立後のパーツの機能部分として残ります。 Therefore, the characteristics of the adhesive layer play a key role in the performance and appearance of the finished part.
 
Consider these characteristics when selecting an adhesive:
  • Chemical compatibility with parts being joined
  • 組立後の接合部の外観の美しさ
  • Expansion/contraction with temperature changes (NOTE: if expansion/contraction are a major concern, consider mechanical fasteners.)
  • 脆性、剛性、柔軟性
  • 耐久性 / 耐用性
  • 接着強度(プラスチックとの接着力)
  • 結合強度(引裂き強さ)
  • 最終用途の要件
 
Eastman Tritan copolyester offers outstanding chemical resistance and has been studied with many adhesives and different bonding procedures. 
Adhesive bonding procedures for Eastman Tritan copolyester     
When adhesive bonding parts made with Tritan, joining surfaces should:
  • Fit well without forcing
  • Have no visible gaps
  • Be smooth but not polished:
    • Sand the surfaces you wish to bond with a 120-grit or finer paper.
    • ダイヤモンドホイール(砥石)、ジョインター/プレーナーなどの機械装置を使用しても、良好な結果が得られます。
    • Do not use soft-polishing wheels or flame polishing, as they can round the edges, creating gaps and improper fit.
 
Before selecting an adhesive system, conduct a careful evaluation of the part application to ensure the adhesive provides both acceptable performance (bond appearance and strength) and that it meets all applicable regulatory requirements. See inset box for several recommendations.
 NOTE: This list of recommended adhesive systems does not include all products have been used successfully with Tritan. For best performance, always follow the guidelines provided by the adhesive manufacturer.
    
Recommended adhesive systems for use with Tritan
  • Dymax adhesives for medical devices 
  • Henkel adhesives for medical devices 
  • Weld-On® 55*
  • Lord® adhesives 7542 A/B*
  • Flex Welder 14345*
  • Lord adhesives 403/19*
  • Lord adhesives 406/19*
  • Lord adhesives 406/17*
  • Plastic Welder® II 14340*
*Tested according to ASTM D1002

For details about bonding Tritan to itself and to other materials, contact your Eastman technical representative. For more information about adhesive bonding as well as tips for decorating, painting, overmolding, and other tips, download a free copy of the Secondary operations guide
 
TMI TIP: Adhesives that contain a volatile component may shrink while curing.接着剤の収縮を補うためには、接合部を斜めにカットし、接着剤を幾分余分に入れることができるような余裕を持たせます。収縮に関する具体的な情報については、接着剤のサプライヤーの資料をご覧ください。