Scope of Test Determine if UVA lamp light energy (mW/cm2 or Joules) diminishes as temperature continues to rise outside the optimal operating parameters. According to most UV lamp manufacturers the optimal operating temperature for UVA lamps is 108ºF. At 120ºF it will diminish by 20% and at 140ºF it will diminish by 30%. This is … Read More...
Tag Archives: temperature
Our Technical Solutions Group (TSG) is often contacted by photopolymer platemakers reporting an inconsistent floor. Typically, they measure the lamp output with a UV-A meter and see that the exposure bed is fairly consistent. They don't understand why early in the day things seem to be fine, but as several exposure cycles are performed, the … Read More...
Ink Density, A Universal Problem I can't imagine asking a printer if they ever struggle with achieving color or solid ink density (SID) during a press set up, and they reply with a "no". They would probably be much more likely to roll their eyes and asked me if that was a rhetorical question. The … Read More...
Viscosity and surface tension are two physical characteristics of liquid. Viscosity is simply the measurement of how resistant to flow a liquid is, while surface tension is defined as the resistance a surface to liquid penetration. Viscosity and surface tension are affected by temperature changes. Understanding and controlling ink viscosity remains one of the most significant variables and flexo printing process. … Read More...