Engineer Training UV System Highlights TJ8300 / TJ8500 UV System Highlights
Engineer Training UV System Highlights TJ8300 / TJ8500 Confidential 2 Electromagnetic Radiation VISIBLE UVIR MICRO WAVES RADIO WAVESX-RAYSGAMMA RAYS UVC UVB UVA UVV Nanometers (1nm = a billionth meter)
Engineer Training UV System Highlights TJ8300 / TJ8500 Confidential 3 Curing not Drying! ConventionalUV Dry Solvent loss WetUV Exposure Heat Wet = Dry Film Thickness
Engineer Training UV System Highlights TJ8300 / TJ8500 Confidential 4 How UV is Produced Medium pressure Mercury Arc lamp (up to 240W/cm) emits UV light. Lamp power = 36kW (180cm × 200W/cm).
Engineer Training UV System Highlights TJ8300 / TJ8500 Confidential 5 Lamp Construction Quartz envelope transparent to UV. Withstands high operatiing temperature. Low coefficient of expansion. Quartz Tungsten ElectrodeMolybdenum Foil
Engineer Training UV System Highlights TJ8300 / TJ8500 Confidential 6 UV Lamp “Striking” Ionization of Gas fill Arc formed Mercury vaporized to form plasma UV photon emission Gas Electrons Mercury
Engineer Training UV System Highlights TJ8300 / TJ8500 Confidential 7 UV Lamp cooling Quartz temperature between 600°C & 800°C Foil seal temperature below 250°C Below 600°C: C = mercury condensation. Above 800°C: C = quartz distortion & diversification Cooling flow to match lamp power
Engineer Training UV System Highlights TJ8300 / TJ8500 Confidential 8 UV Lamp cooling (Cont.) Electrode Quartz Body Molybdenum Foil
Engineer Training UV System Highlights TJ8300 / TJ8500 Confidential 9 Characteristics of UV Lamps ~ 25% UV light ~ 20% Visible light ~ 55% Infra-red (heat)