Bonding Glassware with UV Curing Adhesives

1. Bonding Glassware with UV Curing Adhesives Bob Goss Henkel Loctite Adhesives Ltd

2. Bonding with UV Adhesives • UV Curing Adhesives • The Curing Process • Curing Equipment • Glass Bonding Applications • Secondary Cure Products

3. UV Curing Adhesives • UV Acrylics • UV Cationic Epoxies • UV Silicones • UV Cyanoacrylates

4. UV Curing Adhesives • Products cure when exposed to UV light • UV • Wavelength • Intensity

5. Far UVC Near UVA Middle UVB Visible UV 200nm 280nm 320nm 400nm 600nm 60 Adhesive Curing 50 40 INTENSITY 30 20 10 0 300 365 400 500 600 200 220 Wavelength - nm Curing UV Adhesives

6. UV Wavelengths Depth of Cure Improves Surface Cure Improves

7. UV Wavelengths • UVV 395-445nm • UVA 320-390nm • UVB 280-320nm • UVC 220-280nm

8. Surface Cure Depth of Cure Types of UV Bulb General Purpose

9. UV Intensity • Measured in milliwatts/cm2 (mW/cm2) • Low Intensity 5-10 mW/cm2 • High Intensity 100 mW/cm2 • UV Adhesives require 500-1500 mJoules of UV energy for full cure in a typical application • i.e. 100 mW/cm2 for 5-15 seconds

10. Liquid Solid UV curing adhesives • Speed of cure and depth of cure are determined by light intensity

11. 365 nm UV curing adhesives • O2 Inhibition Effect 220 nm required for tack free cure

12. Determination of Extent of Cure • No Easy Production Method • Establish Limits • Check all other Process Variables • Check UV Lamp Performance

13. UV Curing Systems

14. Bench Top UV Curing Systems • Low cost 400 Watt lamp • Ideal for Low Volume Decorative Glass Bonding Applications • Intensity 25 mW/cm2 at UVA

15. Bench Top UV Curing Systems • High Powered UV unit • 100 mW/cm2 at UVA and UVC • For Tack Free curing

16. Light Guide UV Curing Systems • High Powered UV Light Guide Unit • >1000 mW/cm2 at UVA and 50 mW/cmUVC • For Tack Free curing • Ideal for small parts.

17. UV Conveyor Systems • Purpose Built UV systems • For High Volume Production Applications.

18. Bonding with UV Adhesives • UV Curing Adhesives • The Curing Process • Curing Equipment • Glass Bonding Applications • Secondary Cure Products

19. Bonding Glass to Metal • Epoxy • Polyurethane • Silicone • Structural Anaerobic • Toughened Acrylic • Cyanoacrylate • UV Curing Product

20. Benefits of UV Adhesives • Fast cure • Good optical clarity • Cure on demand • Single part - easy to automate • Excellent adhesion • Secondary cure option

21. Application areas • Decorative glassware • Medical disposables • Electronic component potting/coating • Furniture manufacture • Costume Jewellery • Optical instruments

22. Glass Bonding • Cyclops is bonded to Facia

23. Parameters to consider • Viscosity of Adhesive • Deep curing/Substrate absorption • Handling times  • Secondary Cure • Environment

24. Glass Coloured Glass Glass Filter effect of substrate

25. Secondary Cure

26. Glass to Metal Bonding • UV anaerobic ensures full cure • UV Adhesive is Dishwasher safe

28. Bonding Plastics • Swimming Goggles • Blood Filters

29. Summary of UV Adhesives • Cure Speed – Seconds • Wide range of Viscosities • Good Cure Through Volume • Typical Operating Temperature 120°C

30. Bonding Glassware with UV Curing Adhesives Bob Goss Henkel Loctite Adhesives Ltd