Field tests have shown that the efficiency of the reflectors decreases over time under the influence of temperature. Moreover, it is difficult to maintain the original shape of the reflector when a lamp is exchanged. Even if a reflector is well adjusted, up to 15 percent of the ultraviolet radiation may be lost which actually was to be used to dry the ink. Accordingly, more UV power needs to be used to achieve an optimal curing result. In contrast, replacing the entire UV lamp cassette makes the change more efficient and saves operating costs in the long run.
Compact UV LEDs for optimal curing processes
In the field of conventional lighting, the number of LEDs (light emitting diodes) used in a multitude of applications is growing very rapidly. The use of special LEDs such as UV LEDs for industrial processes also shows a strong growth. Their low power consumption, high efficiency and long life of more than 10,000 hours enables UV LEDs to deliver optimal drying and curing results. Recipes for printing inks and adhesives make very specific requirements on the curing process. Ideally, they are adjusted to monochromatic wavelengths which are emitted by the UV LEDs.
For its customers, Heraeus Noblelight develops UV LED systems that meet the special requirements of the respective machine environment. The individual system components are put together from modules. Different sizes of UV LED modules and different wavelengths can be realised. The compact design of UV LED systems makes integration into the curing process simple. The Heraeus UV LED system contains all peripheral components such as control unit, power supply and cooling. The systems are available with water or air cooling. If you use UV LEDs, you will above all save energy during the curing process. LEDs can be switched on and off without any delay. Accordingly, energy is consumed only when it is needed — without any impairment of the output and service life of the LEDs.